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Wyszukujesz frazę "Propulsion" wg kryterium: Temat


Tytuł:
Application possibilities of electric driven propulsion of multi-mode ships
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/246217.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ships propulsion
electric propulsion
multi-mode ships
propulsion systems
Opis:
The ship propulsion solution based on unconventional thrusters driven by electric motors is most often applied for the multi-mode ships. These ships ought to have dynamic positioning system. It forces an application of a few thrusters (most often four, seldom more up to eight). Records from a number of multi-mode ships show amean load of less than 40% of maximum load on the propulsion system. In other side the demand for electric energy of ship industrial part is large, more often than for the propulsion part. In that case the diesel-electric propulsion system application may be economical, because the electric energy generation for all ship's purposes makes possible the main engines work on the optimum loads on lowest specific fuel consumption and allows them a long-term work on heavy fuels. For multi-mode ships like cable ships, suppliers, drilling vessels are convenient an application of unconventional thrusters with direct electric propulsion as well, especially for dynamic positioning systems. The efficiency of the thrusters is a predominant factor for the successful and economical operation. Forecasted development and rise of quantity of diesel-electric propulsion (it means with electrical transmission) would cause increased interest of unconventional thrusters. Ultimately they may revolutionize ship propulsion systems.
Źródło:
Journal of KONES; 2010, 17, 1; 163-168
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of propulsion arrangement choice of multi-mode ship
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/246914.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ships propulsion
propulsion arrangement
multi-mode ships
propulsion choice
Opis:
The propulsion system of multi-mode ships cause many problems of proper the choise of propulsion system elements and theirs arrangement in the design process. This system has to fulfil at least two inverse demands. It ought to make possible efficient ship shift (transit mode) from the port to the off shore work place and return to base, to ensure a ship survive at sea in the worst sea condition possible on that sea area and to fulfil conditions of dynamic positioning accuracy (stationkeeping mode) at specified bad state of the sea - not to stop the ship work for long time. The dynamic positioning systems require multi-element ship propulsion application. The fulfilment, all required possibilities and accuracy of ship positioning by chosen propulsion system specified in the project data, is the most important project problem to obtain the minimum investment costs. The redimensioning of propulsion system, increasing the number of thrusters and theirs possibilities gives the benefits in dynamic positioning accuracy, but increases the investment costs. An expensive project may not be realized because of price. The aim of designer is the choice optimum solution of propulsion system, which is fulfils all expectations of ship owner and crew, and performs all project assumptions.
Źródło:
Journal of KONES; 2010, 17, 2; 129-135
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application possibilities of electric driven propulsion of multi-mode ships
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/247580.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ships propulsion
electric propulsion
multi-mode ships
propulsion systems
Opis:
The ship propulsion solution based on unconventional thrusters driven by electric motor s is most often applied for the multi-mode ships. These ships ought to have dynamic positioning system. It forces an application of a few thrusters (most often four, seldom more up to eight). Records from a number of multi-mode ships show a mean load of less than 40% of maximum load on the propulsion system. In other side the demand for electric energy of ship industrial part is large, more often than for the propulsion part. In that case the diesel-electric propulsion system application may be economical, because the electric energy generation for all ship 's purposes makes possible the main engines work on the optimum loads on lowest specific fuel consumption and allows them a long-term work on heavy fuels. For multi-mode ships like cable ships, suppliers, drilling vessels are convenient an application of unconventional thrusters with direct electric propulsion as well, especially for dynamic positioning systems. The efficiency of the thrusters is a predominant factor for the successful and economical operation. Forecasted development and rise of quantity of diesel-electric propulsion (it means with electrical transmission) would cause increased interest of unconventional thrusters. Ultimately they may revolutionize ship propulsion systems.
Źródło:
Journal of KONES; 2010, 17, 4; 177-183
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-source-supplied parallel hybrid propulsion of the inland passenger ship STA.H. Research work on energy efficiency of a hybrid propulsion system operating in the electric motor drive mode
Autorzy:
Kowalski, J.
Leśniewski, W.
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/259623.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hybrid ship propulsion
ship propulsion
Opis:
In the Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology, design has recently been developed of a small inland ship with hybrid propulsion and supply system. The ship will be propelled by a specially designed so called parallel hybrid propulsion system. The work was aimed at carrying out the energy efficiency analysis of a hybrid propulsion system operating in the electric motor drive mode and at performing the noise pollution measurements. The performed investigations have shown that a significant impact on the efficiency and on the acoustic emission has the type of belt transmission applied.
Źródło:
Polish Maritime Research; 2013, 3; 20-27
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control strategy for marine SSP podded propulsion motor based on strong tracking-EPF
Autorzy:
Yao, W.
Liu, Y.
Sun, H.
Zhang, G.
Zhang, J.
Zhou, M.
Sun, M.
Jiang, D.
Powiązania:
https://bibliotekanauki.pl/articles/258784.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine electric propulsion
EPF
ST-EPF
SSP podded propulsion
propulsion motor
Opis:
Aiming at the non-linearity of state equation and observation equation of SSP (Siemen Schottel Propulsor) propulsion motor, an improved particle filter algorithm based on strong tracking extent Kalman filter (ST-EKF) was presented, and it was imported into the marine SSP propulsion motor control system. The strong tracking filter was used to update particles in the new algorithm and produce importance densities. As a result, the problems of particle degeneracy and sample impoverishment were ameliorated, the propulsion motor states and the rotor resistance were estimated simultaneously using strong track filter (STF), and the tracking ability of marine SSP propulsion motor control system was improved. Simulation result shown that the improved EPF algorithm was not only improving the prediction accuracy of the motor states and the rotor resistance, but also it can satisfy the requirement of navigation in harbor. It had the better accuracy than EPF algorithm.
Źródło:
Polish Maritime Research; 2015, S 1; 4-9
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmentally friendly fuel system for liquefied gas carrier propelled with 45 MW main propulsion plant
Autorzy:
Górski, Z.
Cwilewicz, R.
Krysiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/246132.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
natural gas ship propulsion
COGES propulsion system
Opis:
This paper describes the problem of improvement in environment protection by application "environment friendly" fuel natural gas for ship propulsion. In thepaper the most suitable type of ship main propulsion system using natural gas was take into consideration. Propulsion using Iow speed diesel engine, medium speed diesel engine, steam turbine and combined systems were taken into consideration. As a result of analysis it was affirmed that COGES (Combined Gas Turbine and Steam Turbine Integrated Electric Drive System) is the most suitable propulsion plant to be fed with natural gas in contrary to ship diesel engines which adaptation to natural gas use still is in initial condition. COGES type propulsion plant consists in thermodynamic join of gas turbines and steam turbines. Ali turbines drive generators ofmain ship power station supplying simultaneously electric power to ship main propulsion electric motors and to ship electric network as well. It is suggested to use natural gas as fuel for gas turbines. Steam turbines are driven by steam produced in boilers warmed by gas turbines exhaust gases. This way a high efficiency of ship propulsion is obtained. The simplest source of natural gas is cargo carried by LNG (Liquefied Natural Gas) carriers. The preliminary project of such a carrier fuel system is presented in the paper. In addition conditions of application, advantages and disadvantages of natural gas fuel system are discussed.
Źródło:
Journal of KONES; 2010, 17, 1; 149-154
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic control systems for ships fitted with podded propulsion drive (POD)
Autorzy:
Dymarski, C.
Dąbrowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/962799.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
azimuthal propulsion
ship control systems
Opis:
The paper shows purposefulness and possiblity of automation of ship propulsion systems, especially those of POD type, intended to be used on four Baltic navigation ships: a containership, ro-ro ship, product tanker, as well as river-sea-going ship, designed within the frame of the Eureka "Baltecologicalship" project. Requirements of ship classification societies, and general ones for modern ship control systems were presented, as well as a review and analysis of currently applied power plant automation systems for diesel- electric ships fitted with podded propulsion drive (POD), were performed. Moreover real ways and possibilities of controlling ship s course and speed were indicated. Information contained in this paper may facilitate selecting appropriate design assumptions for a propulsion control system to be applied on the above mantioned ships.
Źródło:
Polish Maritime Research; 2004, S 1; 83-86
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of propulsion system failures in the fishing fleet operating from Polish ports
Analiza awarii układów napędowych floty rybackiej operującej w oparciu o polskie porty
Autorzy:
Behrendt, C.
Rajewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/256120.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
fishing
fishing boat
propulsion
failures
propulsion system
Opis:
Part of the research work on "Fishing craft modernization program for the reduction of power consumption and minimization of environmental impact" funded by the EU is an analyses of fishing vessel power systems. Failures occurring in the propulsion systems of Polish fishing boats and cutters are analyzed, covering the years 1999-2007. The effect of the failures on the marine environment has been assessed.
Artykuł oparty jest o dane zebrane w ramach wykonywania pracy badawczej "Program modernizacji jednostek rybackich w aspekcie zmniejszenia nakładów energetycznych i oddziaływania na środowisko" w ramach grantu UE. W artykule przedstawiono analizę awarii układów napędowych polskiej floty rybackiej, tj. łodzi i kutrów rybackich, które to awarie miały miejsce w latach 1999-2007. Oceniono wpływ zaistniałych awarii na zagrożenie dla środowiska morskiego.
Źródło:
Problemy Eksploatacji; 2008, 1; 147-152
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waterjet propulsion of small-draught inland waterways ships
Autorzy:
Domachowski, Z.
Próchnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/260461.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hydromechanics
Opis:
This paper presents some aspects of ship waterjet propulsion. Advantages and limitations of its applicability are discussed. Also, possible use of waterjet propeller to move a small-draught inland waterways ship, is considered .
Źródło:
Polish Maritime Research; 2006, S 2; 66-71
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of improving safety and reliability of ship propulsion system during dp operations
Autorzy:
Herdzik, I.
Powiązania:
https://bibliotekanauki.pl/articles/247846.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
propulsion system
dynamic positioning operation
reliability
safety
propulsion system solutions
Opis:
Improving safety and reliability of ship propulsion system during dynamic positioning (DP) operations of multipurpose vessels is an essential advantage. It may be such possibilities obtained by application the considered solutions of propulsion systems and all other elements of energetic system. The minimum requirements were determined by creating the regulations of dynamic positioning systems and their levels. Applying the solutions, which were exceeded the limits of basic requirements, allows to increase the safety and reliability levels with a low rise the investment costs. Many marine companies try to invent so low cost solutions. An example analysed in the paper is the Wartsila LCC system. The applications of more complicated solutions in comparison to required duplicated systems are expensive. The cheaper solution is an investing in the development of automatics configurations (for those systems it was applied the triple and quadruple configurations) which in transient or emergency conditions may obtain the time delay making possible a support of industry part work and DP systems. In emergency situation, after the loss of position by DP system, the power management system allow the safe break of work the industry part and return to work after elimination the critical condition.
Źródło:
Journal of KONES; 2012, 19, 2; 219-226
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propulsion characteristics of multi-mode ships in aspect of ships dynamic positioning application
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/243980.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ships propulsion
propulsion characteristics
multi-mode ships
dynamic positioning systems
Opis:
The dynamic positioning systems require multi-element ship propulsion application. The chosen solutions have decisive effect on propulsion system possibilities, in ship dynamic positioning accuracy also. The automation system has an essential influence on it, because it is an integral part with propulsion system mponsible for this process. The most often ship propulsion solution based on unconventional thrusters driven by electric motor s also. A few independent propulsion systems is essential but it complicates this system, it is limited the number (most often to 4, seldom more up to eight). There are no solutions with traditional rudder and steering gear. These functions take over azimuthing thrusters because they can generale directional thrust force. It must be settle the question of the number of thruster choose and the span angle of azimuthing (most often by thruster turning). In that case it gets the possibilities of ship positioning, they may display as propulsion system characteristics, giving a view on ąuality of positioning process. The last veriflcation is made in real sea conditions when it may test if chosen solution of ship propulsion system fulfils the requirements of positioning accuracy. It was presented the examples of multi-mode ship propulsions and parameters of theirs propulsion plants.
Źródło:
Journal of KONES; 2010, 17, 3; 127-134
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept design of diesel – hydraulic propulsion system for passenger ship intended for inland shallow water navigation
Autorzy:
Dymarski, Czesław
Powiązania:
https://bibliotekanauki.pl/articles/259998.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion systems
hydraulic drive and control
azimuthal propulsion systems
Opis:
This paper presents an analysis of environmental and technical conditions necessary for working out a possibly most favourable propulsion system for a two – segment passenger ship intended for navigation between Berlin and Kaliningrad. There are presented various types of propulsion systems for small ships as well as analyzed their possible applications and consequences. In this work there were taken into account system’s reliability, efficiency, dimensions, mass and costs of manufacturing, assembling and possible replacing the system components as well as an impact on maneuverability and natural environment. With taking into account the above mentioned criteria it was finally found that the diesel-hydraulic system fitted with two azimuthal ducted solid propellers is the most favourable. There are also presented a schematic propulsion and control diagram, three-dimensional arrangement drawing of system components as well as assembly drawing of the designed azimuthal propulsion system.
Źródło:
Polish Maritime Research; 2019, 3; 30-38
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficient and environmentally friendly hybrid conversion of inland passenger vessel
Autorzy:
Litwin, W.
Leśniewski, W.
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/259006.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hybrid propulsion
green shipping
zero emission
solar power
Opis:
The development and growing availability of modern technologies, along with more and more severe environment protection standards which frequently take a form of legal regulations, are the reason why attempts are made to find a quiet and economical propulsion system not only for newly built watercraft units, but also for modernised ones. Correct selection of the propulsion and supply system for a given vessel affects significantly not only the energy efficiency of the propulsions system but also the environment – as this selection is crucial for the noise and exhaust emission levels. The paper presents results of experimental examination of ship power demand performed on a historic passenger ship of 25 m in length. Two variants, referred to as serial and parallel hybrid propulsion systems, were examined with respect to the maximum length of the single-day route covered by the ship. The recorded power demands and environmental impact were compared with those characteristic for the already installed conventional propulsion system. Taking into account a high safety level expected to be ensured on a passenger ship, the serial hybrid system was based on two electric motors working in parallel and supplied from two separate sets of batteries. This solution ensures higher reliability, along with relatively high energy efficiency. The results of the performed examination have revealed that the serial propulsion system is the least harmful to the environment, but its investment cost is the highest. In this context, the optimum solution for the ship owner seems to be a parallel hybrid system of diesel-electric type.
Źródło:
Polish Maritime Research; 2017, 4; 77-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling the dynamics of ships with different propulsion systems for control purpose
Autorzy:
Gierusz, W.
Powiązania:
https://bibliotekanauki.pl/articles/259918.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship dynamics
simulation model
pod propulsion
conventional propulsion
tests results
Opis:
Two different propulsion systems are analyzed from point of view of future control applications. The traditional one consists of a pushing single screw propeller and a blade rudder. The other system is based on pod (pods): pulling or pushing ones. The equations describing forces and moments generated in both systems, are presented. Exemplary results of a simulation in comparison to the real-time experiments for two ships are also shown.
Źródło:
Polish Maritime Research; 2016, 1; 31-36
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Step by Step Approach for Evaluating the Reliability of the Main Engine Lube Oil System for a Ships Propulsion System
Autorzy:
Anantharaman, M.
Khan, F.
Garaniya, V.
Lewarn, B.
Powiązania:
https://bibliotekanauki.pl/articles/116248.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Ship Propulsion
Main Engine
Main Propulsion
Lubricating Oil System
Markov Analysis
reliability
Propulsion System
Engine Lube Oil System
Opis:
Effective and efficient maintenance is essential to ensure reliability of a ship's main propulsion system, which in turn is interdependent on the reliability of a number of associated sub- systems. A primary step in evaluating the reliability of the ship's propulsion system will be to evaluate the reliability of each of the sub- system. This paper discusses the methodology adopted to quantify reliability of one of the vital sub-system viz. the lubricating oil system, and development of a model, based on Markov analysis thereof. Having developed the model, means to improve reliability of the system should be considered. The cost of the incremental reliability should be measured to evaluate cost benefits. A maintenance plan can then be devised to achieve the higher level of reliability. Similar approach could be considered to evaluate the reliability of all other sub-systems. This will finally lead to development of a model to evaluate and improve the reliability of the main propulsion system.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 367-371
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propulsion module for unmannned vehicle
Autorzy:
Polak, F.
Szczęch, L.
Powiązania:
https://bibliotekanauki.pl/articles/244495.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
unmanned vehicle
hybrid propulsion system
UGV
electric generator
electric propulsion motor
Opis:
Solution of the propulsion system of the unmanned vehicle elaborated and built in the Laboratory of Internal Combustion Engines Military University of Technology is shown in the paper. Unmanned vehicles are about to play key role in modern warfare. There are many types of unmanned vehicles. Those which can operate in urban areas, especially inside buildings are considered as a most useful for modern army. Most unmanned vehicles are battery operated, causing low range or low speed of the vehicle. Internal combustion engines are not proper for operation inside buildings, due to exhaust gases produced by engine. Connecting two types of propulsion system, defect of range in battery and gases in combustion engines are eliminated, because we can program vehicle to not turning on engine inside buildings. Using a module for those types of vehicles, we can design entire gamut of unmanned and even manned vehicles, decreasing design costs and repair time due to parts repeatability. Using a prepared propulsion module, design engineer can freely determine length, width and wheel track of designed vehicle. Designed modules enable vehicle fast return to combat ability, due to parts repeatability. One module, used as a host, can reconstruct damage vehicle. There is possibility of using different engines, enlarging list of available modules. Economic factor has also big meaning, due to parts repeatability.
Źródło:
Journal of KONES; 2011, 18, 1; 479-482
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New concept of hybrid propulsion with hydrostatic gear for inland water transport
Autorzy:
Piątek, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/259722.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland water transport
propulsion system
hybrid propulsion
hydrostatic gear
energy efficiency
Opis:
The article presents the development of author’s concept of a diesel/hydraulic propulsion system for inland watercraft. Due to specific nature of vessel navigation on rivers, classical propulsion systems with shaft lines can be effectively replaced by systems with hydraulic power transmission. A solution is also presented of a hybrid design with extra electric port having the form of a pumping system driven from a battery of accumulators. Strong and weak points of the proposed solution are discussed and its energy efficiency is assessed.
Źródło:
Polish Maritime Research; 2019, 2; 134-141
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A proposal of ship gas-turbine driven waterjet propulsion - preliminary considerations
Autorzy:
Próchnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/962800.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hydromechanics
waterjet
Opis:
In the paper are presented preliminary considerations concerning the efficiency of waterjet ship propulsion system, as well as the calculation of main dimensions of waterjet channel. The friction and momentum losses of the flow channel have been roughly estimated by using Fliegner s equations. An important conclusion is confirmed that the summary losses are inversely proportional to square of ship velocity (~1/u2). On the other hand the ship propulsion power is directly proportional to third power of ship velocity (~u3). Therefore to minimize ship s hull resistance, hulls of water jet-driven ships ought to be of a great slenderness - e.g. L/B = 15, stabilized by sponsons, or of semi-swath hydrofoil-supported construction.
Źródło:
Polish Maritime Research; 2004, S 1; 79-82
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model tests of the resistance, propulsion and manoeuvrability of ships in the Experimental Centre in Ilawa
Autorzy:
Welnicki, W.
Powiązania:
https://bibliotekanauki.pl/articles/260211.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
resistance
propulsion
manoeuvrability
ships
Opis:
Paper presents the development of resistance, propulsion and steering quality model tests carried out on lake. Such pioneering investigations began in 1956 and were gradually improved and extended. Original equipment and measurement methods were developed. The paper presents those research methods and techniques,and also accuracy of the results, in a historical perspective. Described are also several most important research programmes accomplished in the Centre.
Źródło:
Polish Maritime Research; 2007, S 2; 8-12
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advanced laboratory for testing plasma thrusters and Hall thruster measurement campaign
Autorzy:
Szelecka, A.
Powiązania:
https://bibliotekanauki.pl/articles/146143.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electric propulsion
Hall thruster
Opis:
Plasma engines are used for space propulsion as an alternative to chemical thrusters. Due to the high exhaust velocity of the propellant, they are more effi cient for long-distance interplanetary space missions than their conventional counterparts. An advanced laboratory of plasma space propulsion (PlaNS) at the Institute of Plasma Physics and Laser Microfusion (IPPLM) specializes in designing and testing various electric propulsion devices. Inside of a special vacuum chamber with three performance pumps, an environment similar to the one that prevails in space is created. An innovative Micro Pulsed Plasma Thruster (LPPT) with liquid propellant was built at the laboratory. Now it is used to test the second prototype of Hall effect thruster (HET) operating on krypton propellant. Meantime, an improved prototype of krypton Hall thruster is constructed.
Źródło:
Nukleonika; 2016, 61, 2; 213-218
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwości hybrydowych i elektrycznych układów napędowych w oddziaływaniu na kierunek ruchu pojazdu
The potential influence of hybrid and electric drivetrains on vehicle’s motion direction
Autorzy:
Dzida, J.
Powiązania:
https://bibliotekanauki.pl/articles/133479.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
układ napędowy pojazdów
napęd hybrydowy
napęd elektryczny
sterowanie napędem
vehicle’s drivetrain
hybrid propulsion
electric propulsion
propulsion control
Opis:
W artykule wskazano, że napędy hybrydowe i elektryczne, oprócz znanych walorów ekologicznych, są szczególnie korzystne do budowania zaawansowanych systemów sterowania napędem kół, które wpływają na kierunek ruchu pojazdu (Torque Vectoring). Wychodząc od opisu złożonej budowy takich systemów w pojazdach napędzanych silnikiem spalinowym stwierdzono, że w przypadku napędzania kół silnikami elektrycznymi, realizacja funkcji takiego systemu jest prostsza. Omówiono zasadnicze rodzaje i przykłady takich konstrukcji, uwypuklając różnice w ich strukturze oraz występujące problemy i ograniczenia. W podsumowaniu podkreślono ważność tego aspektu napędzania kół silnikami elektrycznymi, co przekłada się poprawę bezpieczeństwo czynnego pojazdów.
The paper indicated that hybrid and electric drivetrains, besides its well known ecological values, are particularly advantageous for designing advanced systems of wheel control, which influence the direction of vehicle’s motion (Torque Vectoring). Starting from the description of complex systems meant for combustion engine powered vehicles, it was stated that when wheels are propelled by electric motors, realization of such system is simpler. The basic types and examples of such designs were reviewed; and their structure, associated issues and limitations were emphasized. The summary underlined the importance of this aspect of electric motor propulsion, which translates into improved active safety of vehicles.
Źródło:
Combustion Engines; 2013, 52, 3; 1084-1088
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosing of ship propulsion elements by vibration measurement
Autorzy:
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244654.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnosing
vibroacoustics
gas turbine engines
ship propulsion plantDiagnosing
ship propulsion plant
Opis:
In the present time the technical progress, make us use more and more complicated machines in our everyday life. The application of turbine engines as the main propulsion engines of a vessel impels, according to requirements, operation procedures. It alters considerably the usage of gas turbine engines in the navy from the ones in aviation. The relatively low load is characteristic to the operation of the marine engine. In the case of the technology used at sea, the necessity of highly specialized service is especially evident. In the paper, we present the diagnostic systems elaborated to support the exploitation of the vessel power plant with gas turbines. Application of computer simulation for diagnosing a technical state of gas turbines rotor sets should be applied during calculation and project process. During engine assembly, the rotating components are mounted with great care with the main objective of minimizing shaft unbalance. However, even with the best of care, such factors as machining imperfection, differential thermal expansion etc cause a small residual unbalance of gas turbine rotor. The dynamic problems of Marine Gas Turbine Engines are connected with such basic elements: rotors, bearings, struts of bearings, engine body and type of substructure. The proposed diagnostics method makes it possible to determine the limiting value of vibration symptoms .
Źródło:
Journal of KONES; 2011, 18, 1; 93-98
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Main propulsion of modern cruise liners and main propulsion power estimation
Autorzy:
Górski, Z.
Giernalczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/246128.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
eruise liner
main propulsion
Opis:
This paper describes development trends of modern cruise liners and their main propulsion plants as well The growing size of such vessels and growing power of propulsion plants is observed in the population. Diesel-electric propulsion plants, combined propulsions plants CO D AG type (diesel and gas turbines) and COGES type (gas turbines and steam turbines) are mostly used on this class ships. In this types of propulsion diesel engines, gas turbines and steam turbines drive generators thus creating central electric power station to supply electric power to main propulsion electric motors and to ship electric network as well. Medium speed diesel gear type main propulsions are used on older cruise liners only. The paper presents the method of preliminary estimation of ship energetic system parameters i. e. main propulsion power, onboard electric power station power and auxiliary boilers capacity. The method is based on statistic analysis of cruise liners being in service and under construction. Statistic methods are elaborated in Department of Marine Propulsion Plants of Gdynia Maritime University. These methods make possible in simple and quick way to estimate parameters of ship energetic system. The estimation is carried out with good correlation coefficient and high coefficient ofregression determination. Statistic methods make also possible to forecast energetic systems parameters for ships to be built in the future.
Źródło:
Journal of KONES; 2010, 17, 1; 155-161
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ring thruster – a preliminary optimisation study of ferrofluid seal and propeller
Autorzy:
Szydło, Z.
Matuszewski, L.
Powiązania:
https://bibliotekanauki.pl/articles/963466.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ferrofluid seals
underwater propulsion
Opis:
The article reports the course of preliminary examination of a ferrofluid seal applied in liquid environment. A newly built research rig is described, and results of pressure tests performed for different shaft rotations are discussed. Other studies carried out in the past only referred to the gas environment, while the present examination aims at finding an answer to the question whether magnetic liquids can be successfully used in underwater applications. The obtained answer is positive, but further, more comprehensive investigations of the problem are necessary.
Źródło:
Polish Maritime Research; 2007, S 1; 71-74
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposals and possibilities of unconventional thrusters applications for ship propulsion
Propozycje i możliwości zastosowan aktywnych pędników do napędu statków
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/245726.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
napęd statków
pędniki aktywne
układy napędowe
ships propulsion
unconventional thrusters
propulsion systems
Opis:
Unconventional thrusters have enhanced possibilities of direction oriented thrust generating, owing to the fact they are finding application as propulsion of chosen ships. On account on demand of navigational safety assuring (tugs, double-endedferńes, special ships, chosen cruise liners) or dynamic positioning (cable ships, suppliers, drilling vessels) the ship propulsion solution based on unconventional thrusters. That part of marine propulsion market was dominated by them. Unconventional thrusters allow possibilities of other applications like auxiliary propulsion (or emergency), bow or aft thrusters, antiheeling equipment. It is quested possibilities for other applications. By the way developing with aggressive promotion of that propulsion system advantages and presentation of theirs applications on still increasing quantity of ships, it is created an atmosphere that it is necessary tofollow this way that no return to association - modern and safe ship is a ship equipped as a minimum with auxiliary unconventional propulsion system. In a practice, ships equipped with this propulsion system, give a crew a enhanced comfort of work ditring manoeuvring and even from that reason they are pleasant seen by ship crew. It must be seen these thrusters have excellent future. The efficiency drop is about 6-8% in comparison with conventional propulsion system and increasing fuel consumption, but this is the only one disadvantage. Forecasted development and rise of diesel-electric propulsion systems quantity would cause increased interest of unconventional thrusters. Ultimately they may revolutionize ship propulsion systems.
Pędniki aktywne posiadają zwiększone możliwości wytwarzania ukierunkowanej siły naporu, dzięki temu znajdują zastosowanie do napędu wybranych jednostek morskich. Ze względu na wymagania zapewnienia bezpieczeństwa żeglugi (holowniki portowo-redowe, promy pasażerskie używane do przepraw, jednostki specjalistyczne, niektóre duże statki pasażerskie tzw. cruise liners) lub pozycjonowania jednostek (kablowce, suppliery, jednostki wiertnicze) zalecane jest rozwiązanie napędu głównego statku w oparciu o pędniki aktywne. Ta część rynku została przez nie zdominowana. Dają one również możliwości innych zastosowań np. jako napęd awaryjny (pomocniczy), stery strumieniowe, urządzenia przeciwprzechyłowe. Poszukuje się ich możliwości dalszych zastosowań. Przy okazji występując z agresywną reklamą zalet tej formy napędu oraz prezentacją ich zastosowań na coraz większej liczbie statków, wytwarza się atmosferę, że należy podążać tą drogą, że nie ma odwrotu od skojarzenia: nowoczesny i bezpieczny statek to statek wyposażony chociaż w pomocniczy napęd z użyciem pędników aktywnych. W praktyce, jednostki wyposażone w tą formę napędu dają zwiększony komfort pracy podczas manewrowania i z tego chociażby powodu są mile widziane przez załogi statków. Należy zauważyć, że są to pędniki mające przyszłość. Niedostatek sprawności w porównaniu z tradycyjnym napędem jest rzędu 6-8%, co powoduje odpowiednio zwiększone zużycie paliwa, ale jest to jedyna podstawowa wada. Przewidywany rozwój i wzrost liczebności napędów diesel-elektrycznych (z tzw. przekładnią elektryczną) spowoduje zwiększone zainteresowanie pędnikami aktywnymi. Docelowo mogą one zrewolucjonizować napędy statków.
Źródło:
Journal of KONES; 2009, 16, 4; 155-162
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosing elements of ship propulsion of vibration measurement
Autorzy:
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/243179.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnosing
vibroacoustics
gas turbine engines
ship propulsion plant Diagnosing
ship propulsion plant
Opis:
In the present time the technical progress make us use more and more complicated machines in our everyday life. In the case of the technology used at sea the necessity of highly specialised service is especially evident. The diagnostic systems elaborated to support the exploitation of the vessel power plant with gas turbines are presented in the paper. Application of computer simulation for diagnosing a technical state of gas turbines rotor sets should be applied during calculation and project process. During engine assembly, the rotating components are mounted with great care with the main objective of minimising shaft unbalance. However, even with the best of care, such factors as machining imperfection, differential thermal expansion etc cause a small residual unbalance of gas turbine rotor. The dynamic problems of Marine Gas Turbine Engines are connected with such basic elements as rotors, bearings, struts of bearings, engine body and type of substructure.
Źródło:
Journal of KONES; 2007, 14, 2; 81-89
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case Study on the Unavailability of a Ship Propulsion System under Aging Effects and Maintenance
Autorzy:
Okazaki, T.
Powiązania:
https://bibliotekanauki.pl/articles/117350.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
vessel exploitation
unavailability of a ship propulsion system
ship propulsion
ship propulsion system
aging effects
ship maintenance
GO-FLOW
fuel consumption
Opis:
Unavailability of a ship propulsion system under aging effects and proper maintenance is estimated using GO-FLOW. GO-FLOW is an effective software tool for the unavailability analysis of complex systems. Aging effects are incorporated into GO-FLOW using a time-dependent technique and assuming a linear aging model. The results show that the aging effects and improper maintenance can potentially increase the frequency of accidents due to a malfunction of the propulsion system by a factor of three.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2016, 10, 3; 501-508
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory stand for research on mini CyberSeal
Autorzy:
Szymak, P.
Praczyk, T.
Pietrukaniec, L.
Hożyń, S.
Powiązania:
https://bibliotekanauki.pl/articles/114481.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
biomimetic underwater vehicle
undulating propulsion
Opis:
In recent times, we may notice some new designs of underwater vehicles, which imitate living underwater organisms, e.g. a fish, a seal, a turtle, etc. These vehicles are called biomimetic. They are driven by undulating propulsion, imitating wavy motion of fins, which were created during many years of evolution. In the paper, a laboratory stand for research on Biomimetic Underwater Vehicle (BUV) called mini CyberSeal is presented. The main objectives of the stand is to investigate future construction of BUV imitating a seal (made in scale) and to test different control algorithms for this BUV. At the beginning of the paper, an introduction to the research area and a structure of the laboratory stand is described in general, and then in the following section all elements of the stand are presented in details. At the end of the paper, an initial research on mini CyberSeal and a schedule of the future research are inserted.
Źródło:
Measurement Automation Monitoring; 2017, 63, 7; 228-233
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LNG as a marine fuel - possibilities and problem
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/242119.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine fuel
LNG
ship propulsion
Opis:
The limitations of marine fuels use incorporated sulphur on levels 4-5% for HFO and 0.5-1% for MDO were caused a necessity of possessing on ship a few types of fuel: conventional and with limited amount of sulphur. It is a necessary to separate the installation of different fuels caused that the ship fuel system are complicated. It is needed to change the fuel with time advance on areas with SOx controlled emissions (SECA areas) for example Baltic and North Sea. In the same time it is needed to change the engine adjustment in the aim of decreasing NOx emission. It allows for fulfilling the emission on tier 2 level (IMO regulations). It was announced for January 1st 2016 the time of tier 3 requirement of being in force. It is seemed to be impossible the fulfilling of that standard on marine liquid fuels (HFO and MDO). It was interested on gas fuels, especially on popular one the liquid natural gas (LNG). In the liquid state LNG is seemed to be an attractive marine fuel. It is remaining a problem of marine engines adaptation for burning that type of fuel in the aim of fulfilling the tier3 standard. At present, available dual fuel for marine diesel engines burn natural gas for ship operating reasons. Fulfilment these requirements needs an engine modernization or the alternative way is use of piston spark engines. There is an additional problem the assurance of repeatability of natural gas combustion process. During the change of engine load changes the fuel-air mixture composition, it is heterogeneous in the cylinder volume caused the ignition loss, the knocking combustion and the risk of out-of-control fuel self-ignition. The paper presents a probe of analysis these problems.
Źródło:
Journal of KONES; 2011, 18, 2; 169-176
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A design concept of main propulsion system with hydrostatic transmission gear for inland waterways ship
Autorzy:
Dymarski, C.
Skorek, G.
Powiązania:
https://bibliotekanauki.pl/articles/260451.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland ships
hydrostatic propulsion system
Opis:
This analysis is aimed at presentation of a design concept of ship’s main propulsion system and determination of its total efficiency. To realize the task it is necessary to have a look at description of energy losses and efficiency of hydrostatic transmission gear, with taking into account its possible simplification. Image of mutual interaction of losses generated in all elements of hydraulic system appears very complex. In this paper energy balance of main propulsion system with hydrostatic transmission gear intended for a segment ship for inland waterways and coastal service, was analyzed under assumption of necessary simplifications.
Źródło:
Polish Maritime Research; 2006, S 2; 57-61
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Possibility of Using Hybrid Electric-Propulsion Systems for Inland Barges
Autorzy:
Łebkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/117239.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
inland shipping
inland barges
main propulsion
hybrid electric-propolsion
hybrid electric-propulsion system
electric propulsion system
self-propelled barges
inland water transport
Opis:
The paper presents issues related to the possibility of using an electric propulsion system for inland craft, in this particular case self-propelled barges. Perspectives for development of inland water transport in Poland are presented. Historical engineering designs used in water transport at the turn of the 19th and 20th centuries are shown. The current status of stock used in inland navigation along with the condition of waterways available in Poland is presented. Energy consumption by inland craft using various configurations of propulsion systems is discussed, along with comparison of energy consumption during transport of goods using road transport, rail transport and inland waterway transport. In addition to the hybrid electric and diesel propulsion systems, the alternative is to use the electric rail mules for moving the barges.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 261-269
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges of ship propulsion systems during DP operations
Autorzy:
Herdzik, I.
Powiązania:
https://bibliotekanauki.pl/articles/247849.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
propulsion system
challenge
dynamic positioning operation
safety of propulsion system
energy storage devices
Opis:
Ship propulsion configurations with dynamic positioning systems are commonly used as diesel-electric. In particular, situations for ship transfer on longer distances may be used conventional mechanical propulsion system with controllable pitch propeller. Combination of mechanical and electric propulsion system called hybrid propulsion is met as well, where the thrusters of DP systems are driven through the gear by mechanical engine or electric motor independent or both. For the sake of the necessity of limitation of total installed power on the ship may occurred problems with power distribution between the ship propulsion and industry part. It will especially concern those situations when we need to keep power supply to the industry part and there is a necessity to increase the power delivered to ship propulsion part for the purpose of keeping the ship position or heading. The primary task of power management system (PMS) is blackout prevention in ship energetic network and so power distribution to overcome critical conditions of it. Temporarily it may occur the worsening of positioning operation accuracy without any critical situations of industry part. The possibility of momentary overloading of energetic network is primary condition of safety. The critical duration of overloading is one minute. This is indispensable time for increasing the accessible power in the energetic system through switching on the next genset to work. It is a necessity of quick analysis in critical conditions to value what key-actions ought to do in the aim of overcoming emergency situations. The next one is a usage of energy storage devices. It is possible through AC/DC conversion. It was tried to find solutions of equalization the load of gensets to the ship electric energy demand.
Źródło:
Journal of KONES; 2012, 19, 2; 211-217
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinematic of marine piston-crankshaft system
Autorzy:
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/246452.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine propulsion system
piston-crankshaft kinematic
slow speed engines
inertia forces
propulsion system vibrations
Opis:
Two-stroke, slow speed main engines are often installed on merchant ships, because of its very high efficiency. That kind of engine has an output of about 5500 kW per cylinder. The mass of piston-crankshaft system reaches over a dozen tons. That reciprocating masses are source of high level of dynamic inertia forces (mass forces). Those forces have big influence on engines working parameters and characteristics. One of them is instability of crankshaft rotational speed, which leads to dangerous torsional vibrations of propulsion system. Some inconsistency can be observed during analysis of piston-crankshaft system kinematic. In the theoretical engine books, the piston speed and acceleration has only two harmonic components, the inertia forces are depended on engine rotation speed and they doubled rotation speed. However, empirical formulas, published by engines producers, give us at least five harmonic components of mass forces. The author tries to find out the theoretical reason of existing (measured) higher harmonic orders of engines inertia forces. It is a first step for developing monitoring system of propulsion system’s torsional vibrations coupled with axial vibration, dynamic shaft line alignment and crankshaft springing. In the paper two analytical methods of piston displacement, speed and acceleration are presented. Well-known (from literature) equations are compared with more-detailed analytical procedures. The analysis was performed for one of the biggest marine MAN B&W engine, type 7K98MC. A discussion about the analysis results was included in the final part of the paper.
Źródło:
Journal of KONES; 2015, 22, 2; 155-162
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of design parameters for microgasturbine engines
Autorzy:
Czarnecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/242372.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
turbine engines
gasturbine
micro
propulsion
Opis:
The research object consists study of simplified turbojet engine known as a Schreckling design. Simplified layout is related to single centrifugal compressor and single axial turbine design (1R-1T). Presented design is favoured in model gasturbines that uses common compressor rotor from automotive turbochargers. Input data for further calculations was obtained from Garret turbo systems compressor performance maps. Total pressure and total to static stage efficiency was assumed from map of contours at maximum stage efficiency. Additional data from database allowed determining outer diameter and rotational speed of the compressor rotor. Collected data was applied to gasturbine thermogasdynamics model. Decision variables: mass flow rate from 0.1-0.8 [kg/s] range, and exhaust gas temperature from 800-1200 [K] range was taken into account. Turbine expansion ratio was calculated with thermo-mechanical coupling conditions for engine continuous operation. Calculated engine thrust and specific fuel consumption was presented in reference to AMT Netherlands microgasturbine range. Presented results allow to rapid identification of design parameters at early stage of design Obtained results allow to omit thermogasdynamics calculations and focus on the design of the individual engine components. Number of computational models is reduced by 20-30% in reference to given assumptions.
Źródło:
Journal of KONES; 2015, 22, 4; 79-85
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of the hybrid propulsion system for the small unmanned vehicle
Autorzy:
Polak, F.
Walentynowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/244497.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
unmanned vehicle
hybrid propulsion system
Opis:
The paper presents a simulation model of an unmanned vehicle propulsion system designed and constructed at the Laboratory of Internal Combustion Engines WAT. The vehicle was modelled in the software environment AMESim. It is intended as a tool for modelling of mechatronic systems, and therefore it was possible to create a link between mechanical parameters such as gears, with elements from the fields of electrical engineering and electronics, such as electric motors and inverters. Presented undercarriage system modelled the platform with 6x6 and independent drive wheels. Presented model of the hybrid structure of a small unmanned vehicle and sub models driver module and the propulsion module battery charging electric current through a combustion engine (generator controls, the switching of electric current battery capacity following a drop below the desired value - for this calculation was 50% of battery capacity). Characteristics of parameters changes of sets are presented. Simulation study for two batteries of different capacities as an example of the synthetic driving test and analyzed the differences between the foundation and set of characteristics. It was found that the higher-capacity battery could provide a better change of speed.
Źródło:
Journal of KONES; 2011, 18, 1; 471-478
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza możliwości akumulacji energii rozpraszanej w procesie hamowania pociągu napędzanego lokomotywą hybrydową
Analysis of accumulation possibility of energy dissipated in the braking process of train driven by hybrid locomotive
Autorzy:
Kortas, P.
Kropiwnicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/134276.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
układy napędowe lokomotyw
napędy hybrydowe
zużycie paliwa
locomotive propulsion systems
hybrid propulsion systems
fuel consumption
Opis:
W tradycyjnym procesie hamowania cała energia kinetyczna lub potencjalna pociągu napędzanego lokomotywą z silnikiem spalinowym jest rozpraszana do otoczenia w postaci energii cieplnej. W lokomotywach hybrydowych istnieje możliwość odzyskania części tej energii przez przekazanie jej do akumulatorów i ponowne wykorzystanie do napędu pociągu. W pracy przedstawiono model układu napędowego lokomotywy hybrydowej z silnikiem spalinowym, przekładnią elektryczną i zasobnikiem energii oraz model oporów ruchu pociągu. Na podstawie przyjętych warunków pracy lokomotywy oraz składu pociągu na wybranych trasach przeprowadzono obliczenia parametrów energetycznych procesu hamowania pociągu. Wykorzystując wyniki symulacji dokonano analizy wpływu pojemności zasobnika energii na redukcję zużycia paliwa.
In the traditional process of braking all the kinetic or potential energy of a train driven by locomotive with internal combustion engine is dissipated into the environment in the form of thermal energy. Using the hybrid propulsion system in locomotive is possible to recover a part of this energy by passing it to the battery and re-use in the drive train. The paper presents a model of a hybrid locomotive propulsion system with an internal combustion engine, electric transmission, energy storage and a model of train movement resistance. On the basis of the assumed working conditions, the composition of the trains and selected routes, the calculations of the energy performance of the braking process of the train have been done. Using the simulation results an analysis of the impact of energy storage capacity to reduce fuel consumption has been processed.
Źródło:
Combustion Engines; 2015, 54, 3; 631-638
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of effectiveness of waterjet propulsor for a small underwater vehicle
Autorzy:
Rowinski, Lech
Kaczmarczyk, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2033211.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hydromechanics
waterjet
underwater vehicle
Opis:
The goal of the project described is to replace the existing propulsion system of a small underwater vehicle with a solution less prone to mechanical damage and ensuring a lower risk of the entanglement of fibrous objects suspended in the body of water. Four typical marine screws are utilised in the current design of the vehicle. One possible solution of the problem is the application of waterjet propulsors located inside the body of the vehicle instead. The general conditio of the application of the new solution was to secure at least the same motion control capabilities of the vehicle while the basic capability is its propulsion effectiveness at the required speed. Specific features of the considered waterjet propulsor, when compared with their application in surface vessel propulsion, are the lack of the head losses and the low significance of cavitation issues. One of the difficulties in the considered case is the small diameter of the propulsor in comparison to commercially available waterjet units, which have diameters between 0.1 [m] and 1.0 [m]. There is very little data regarding the design and performance of devices in the 0.02 to 0.05 [m] range. Methods utilised to forecast the performance of the new propulsion system are presented and results compared. These were semi-empirical calculations, numerical calculations and tests of real devices. The algorithm that is based on semi-empirical calculations is of particular interest while it offers possibility quick assessment of performance of a propulsor composed of several well defined components. The results indicate the feasibility of modification of the propulsion system for the considered vehicle if all the existing circumstances are taken into account.
Źródło:
Polish Maritime Research; 2021, 4; 30-41
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary research of microgasturbine injection ring
Autorzy:
Czarnecki, M.
Orkisz, M.
Wołoszyn, T.
Powiązania:
https://bibliotekanauki.pl/articles/247528.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
gasturbine
rc gasturbine
propulsion
fuel supply
Opis:
Fuel supply systems used in microgasturbines are designed in experimental way. In literature they exist as geometrically prescribed that is proper in general. In commercial aeroengines injection system is the most vulnerable part which failure generates high thermal loads and causes overheating of whole "hot section " or part of it. Microgasturbines are subjected to overheating due to relative short combustion section and uneven fuel distribution in injection points. Presented article contains preliminary research of fuel injector ring designed for microgasturbine turbojet. Tested fuel collector is supplied from the single source and feeds five vaporizers. Investigations are focused on mass flow measurement from each supply point. Research methodology is similar to supervisory tests carried out on commercial aeroengines. Injector was tested with two types of microfuelpumps: JetCAT A60I405 and FlightWorks 200C. As a working liquid the JET A l kerosene was used For each probe constant volume of liquid was pumped through the system. Pumps were tested infull operational range of voltage. Electric power characteristics were obtained for fuel pump and whole fuel system. The strong influence of throttling on stability of microfuelpumps was affirmed. As a conclusion there is a modernization proposal that aims on quality and quantity of fuel distribution.
Źródło:
Journal of KONES; 2010, 17, 4; 117-122
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Hydrogen Fuel Cells in Rail Transport
Autorzy:
Siwiec, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/2091326.pdf
Data publikacji:
2021
Wydawca:
Instytut Kolejnictwa
Tematy:
hydrogen propulsion
fuel cells
railway transport
Opis:
The article presents the most technologically advanced alternative propulsion of rail vehicles that, at the same time, has great development potential, i.e. hydrogen fuel cells. The current condition of the rolling stock and electrification of the traction network is described, and domestic and foreign plans for the deployment of fuel cells are presented and accompanied by legislative work aimed at the application of environmentally friendly solutions.
Źródło:
Problemy Kolejnictwa; 2021, 190; 125--131
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability Assessment of Main Engine Subsystems Considering Turbocharger Failure as a Case Study
Autorzy:
Anantharaman, M.
Khan, F.
Garaniya, V.
Lewarn, B.
Powiązania:
https://bibliotekanauki.pl/articles/116356.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
main engine
main propulsion
turbocharger
turbocharger failure
main propulsion engine
Markov model
Weibull failur model
reliability
Opis:
Safe operation of a merchant vessel is dependent on the reliability of the vessel’s main propulsion engine. Reliability of the main propulsion engine is interdependent on the reliability of several subsystems including lubricating oil system, fuel oil system, cooling water system and scavenge air system. Turbochargers form part of the scavenge sub system and play a vital role in the operation of the main engine. Failure of turbochargers can lead to disastrous consequences and immobilisation of the main engine. Hence due consideration need to be given to the reliability assessment of the scavenge system while assessing the reliability of the main engine. This paper presents integration of Markov model (for constant failure components) and Weibull failure model (for wearing out components) to estimate the reliability of the main propulsion engine. This integrated model will provide more realistic and practical analysis. It will serve as a useful tool to estimate the reliability of the vessel’s main propulsion engine and make efficient and effective maintenance decisions. A case study of turbocharger failure and its impact on the main engine is also discussed.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 271-276
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza cech eksploatacyjnych układów ruchowych statków typu RoPax
Comparative Analysis of Operational Properties of Propulsion Systems of RoPax Type Ships
Autorzy:
Adamkiewicz, A.
Jarzęcki, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/301453.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
statek
układ napędowy
silnik spalinowy
pędnik
napęd hybrydowy
ships
propulsion system
diesel engine
propeller
hybrid propulsion
Opis:
W artykule przedstawiono genezę powstania statków typu RoPax. Opisano i poddano analizie główne układy napędowe najczęściej stosowane na tego typu statkach: układ spalinowo-mechaniczny, spalinowo-elektryczny oraz układ hybrydowy. Określono moce holowania przyjętych do analizy jednostek: referencyjnej i hipotetycznej z układem napędowym hybrydowym. Przeprowadzono analizę energetyczną porównywanych układów napędowych i dobrano ich główne elementy. Porównano cechy eksploatacyjne analizowanych układów ruchowych statków.
The article presents the origins of RoPax type ships. Main propulsion systems most often used on ships of this type have been analysed i.e the diesel-mechanical system, the diesel-electric system as well as the hybrid system. The towrope horsepowers of the analysed units have been determined: the reference one and the hypothetical one with the hybrid propulsion system. Energy analysis of the compared systems has been carried out and their main elements have been chosen. Operational properties of the analysed ship propulsion systems have been compared.
Źródło:
Eksploatacja i Niezawodność; 2009, 2; 52-62
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research on influence of geometrical configuration on high pressure hydrogen outflow ignition process
Autorzy:
Oleszczak, P.
Mężyk, Ł.
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/245405.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
propulsion
safety
hydrogen
ignition
visual registration
Opis:
Hydrogen is regarded as a potential future fuel for various kinds of vehicles: fuel cell cars, trucks, buses etc. Storing and transportation issues are the crucial safety problems concerned with utilization ofhydrogen. Because of its very łów density hydrogen needs to be stored under very high pressure, in range of 35 division sign 70 MPa, and this create hazard of sudden discharge of hydrogen leading to ignition and severe accident. The aim of the presented research is an experimental investigation of hydrogen ignition as a result of a compression and heating of air by shock wave generated by the discharge of the hydrogen. Mixing of the air heated up by the shock wave and expanding hydrogen can produce combustible mixture of sufficiently high temperature and can lead to ignition. The critical conditions for ignition depend mainly on hydrogen discharge pressure, geometrical configuration, parameters of the ambient air, obstacles, etc. Experimental research -was conducted on a facility specially constructed in Combustion Laboratory, the Institute of Heat Engineering, Warsaw University of Technology. The facility consists from the pressure tank and high pressure hydrogen installation. To allow visualization the observation section is equipped with high quality optical windows. Schlieren visualization system and high speed digital camera was used to register high pressure hydrogen outflow and potential ignition. The high speed digital camera was used to take Schlieren or direct pictures of the process. Additionally, the experiment is registered with use of conventional digital camera. Experiments were conducted for different discharge pressure of hydrogen and outflow to "open space " as well to specially prepared obstacles. Critical condition for which ignition occurs were evaluated for both cases. The high speed Schlieren and direct pictures taken during the experiments are presented in the paper. The influence of presence of obstacles on the feasibility of hydrogen ignition during outflow from high pressure installation is discussed and analyzed.
Źródło:
Journal of KONES; 2009, 16, 4; 357-366
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerodynamic interference between pusher propeller slipstream and an airframe : literature review
Autorzy:
Ruchała, P.
Powiązania:
https://bibliotekanauki.pl/articles/246710.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
air transport
air propulsion
pusher propeller
Opis:
In the article, an aerodynamic interference between pusher propeller slipstream and the airframe of the aircraft powered by it has been presented, based on a literature study. A pusher propeller is one of popular types of the airplane propulsion. It is applied mainly in light sport aircrafts, in the UAVs (Unmanned Aerial Vehicles), unorthodox vehicles, like compound helicopters, canard and joined wing aircrafts etc. The main advantage of pusher propeller is that the engine with the pusher propeller does not affect the visibility from the cockpit and allows placing an electronic equipment in the front part of the UAV’s fuselage. Furthermore, reduced cabin noise and increase in stability due to acting normal force aft of the centre of gravity are other benefits of this configuration. The pusher propeller impact on the airframe, especially on the wing, is qualitatively different from the tractor configuration. Main differences between both propulsions has been discussed, as well as aerodynamic benefits of the pusher propeller – like reduction of separated flow area and extending area of laminar boundary layer. However, an application of pusher propeller may have also negative impact, especially lower performance than tractor propeller. In the article the reasons of this suppression has been briefly discussed.
Źródło:
Journal of KONES; 2017, 24, 3; 237-244
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flight characteristics of helicopter turboshaft engine with free turbine
Autorzy:
Czarnecki, M.
Orkisz, M.
Powiązania:
https://bibliotekanauki.pl/articles/243360.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
propulsion
engine
turboshaft
helicopte
performance
ceiling
Opis:
Numerical model for selected turboshaft engine is highly required by helicopter and aircraft designers. Presented paper includes key features for turboshaft numeric model builders. The study of the real performance and estimated results showed that presented method is exact for higher throttle levels. Presented method will be useful for preliminary design when is no need to acquire real test data. Numerical model was build for steady state operations, because maintenance manual for selected engine includes tests records only at its state. In that case helicopter turboshaft manuals are very similar, steady state was used widely for testing in TB3 and T700 family engines. Steady state reduced effect of rotor head positions which was influencing total engine performance. TB3-117 helicopter turboshaft engine, engine cutaway sections, first step - expansion ratios, second step - on the ground calculations for different throttle position, engine inlet mass flow ratio as a function of maximum allowable EGT, and throttle position, third step - on the ground calculations for different throttle position, second step - on the ground calculations for different throttle position, performance charts for RR-250 BJ turboshaft, and for TB3-117 M/MT - Mi-14/17, TB3-117 III-series Mi-24 are presented in the paper.
Źródło:
Journal of KONES; 2007, 14, 3; 149-151
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propulsion configuration effect on performance of an inverted joined wing airplane
Autorzy:
Galiński, C.
Sieradzki, A.
Kalinowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/244405.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
inverted joined wing
propulsion
performance
CFD
Opis:
Efficiency is crucial for an airplane to reduce both costs of operations and emissions of pollutants. There are several airplane concepts that potentially allow for increasing the efficiency. A few of them were not investigated thoroughly enough yet. The inverted joined wing configuration, where the upper wing is positioned in the front of the lower one is an example of such a concept. Therefore, a project consisting of an aerodynamic analysis and optimisation, development of the software for multidisciplinary optimisation, development of an electric propulsion system, development of an experimental scaled demonstrator, wind tunnel testing and flight-testing was undertaken by consortium led by the Institute of Aviation, including also Warsaw University of Technology, Air Force Institute of Technology and small company MSP. Results of this project led to the conclusion that inverted joined wing configuration allows to build an airplane with the best performance in the world, but its advantage against conventional airplanes is marginal. One reason for this is large trimming drag of the configuration with relatively high position of the thrust vector. Therefore, other configurations of the propulsion were also considered to see if airplane performance could be further improved. This effort is described in the present paper.
Źródło:
Journal of KONES; 2016, 23, 3; 135-141
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of hull biofouling on parameters characterising ship propulsion system efficiency
Autorzy:
Tarełko, W.
Powiązania:
https://bibliotekanauki.pl/articles/259814.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship
hull
biofouling
propulsion system
efficiency
Opis:
One of most important issues concerning technical objects is the increase of their operating performance. For a ship this performance mainly depends on the efficiency of its main propulsion system and the resistance generated during its motion on water. The overall ship resistance, in turn, mainly depends on the hull friction resistance, closely related with the presence of different types of roughness on the hull surface, including underwater part biofouling. The article analyses the effect of hull biofouling on selected parameters characterising the efficiency of the ship propulsion system with adjustable propeller. For this purpose a two-year research experiment was performed on a sailing vessel during its motor navigation phases. Based on the obtained results, three groups of characteristics were worked out for different combinations of engine rotational speed and adjustable propeller pitch settings. The obtained results have revealed that the phenomenon of underwater hull biofouling affects remarkably the parameters characterizing propulsion system efficiency. In particular, the development of the biofouling layer leads to significant reduction of the speed of navigation.
Źródło:
Polish Maritime Research; 2014, 4; 27-34
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Hydrogen Fuel Cells in Rail Transport
Autorzy:
Siwiec, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/2091260.pdf
Data publikacji:
2021
Wydawca:
Instytut Kolejnictwa
Tematy:
hydrogen propulsion
fuel cells
railway transport
Opis:
The article presents the most technologically advanced alternative propulsion of rail vehicles that, at the same time, has great development potential, i.e. hydrogen fuel cells. The current condition of the rolling stock and electrification of the traction network is described, and domestic and foreign plans for the deployment of fuel cells are presented and accompanied by legislative work aimed at the application of environmentally friendly solutions.
Źródło:
Problemy Kolejnictwa; 2021, 190; 125--131
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Propulsion Performance in the Actual Sea by means of Full-scale Experiments
Autorzy:
Kayano, J.
Yabuki, N.
Sasaki, N.
Hiwatashi, R.
Powiązania:
https://bibliotekanauki.pl/articles/116354.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Propulsion Performance
Propulsion
mechanical engineering
Energy Efficiency Design Index (EEDI)
Ship Energy Efficiency Management Plan (SEEMP)
Energy Efficiency Operational Indicator (EEOI)
Self Propulsion Factors
Power Curves
Opis:
The IMO has adopted Energy Efficiency Design Index (EEDI), Ship Energy Efficiency Management Plan (SEEMP) and Energy Efficiency Operational Indicator (EEOI) in order to reduce GHG emissions from international shipping. And, the shipping industry is required to develop and improve the energy saving ship operation technologies to meet the above IMO guideline. The weather routing is one of the energy saving navigation technologies and widely adopted by oceangoing merchant ships. The effectiveness of the weather routing mainly depends on the accuracy of weather forecast data and the ship’s propulsion performance prediction. The propulsion performance in the actual sea is usually predicted using the Self Propulsion Factors obtained by model tests. It is necessary to understand the propulsion performance characteristics in the actual sea conditions for the improvement of propulsion performance prediction. From the above points of view, the authors performed full‐scale experiments using a training ship in order to investigate the propulsion performance characteristics in the actual sea. This paper describes the analysis results on the characteristics of Power Curves and Self Propulsion Factors under various weather and sea conditions.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 521-526
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of shaft line alignment accuracy on the operational reliability of marine propulsion systems
Autorzy:
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/241911.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
shaft line alignment
marine propulsion systems
propulsion system's bearings damages
operating parameters of the power transmission system
Opis:
The paper presents a method of identification parameters of shaft line alignment and its influence on operational reliability of marine propulsion system. The discussion about shaft line parameters (bearings' reactions, bending moment and shear forces acting on crankshaft or gear box, and stresses distribution in the shaft line) which has an influence on marine propulsion system reliability was presented. Proper shaft line alignment is often a problem for repair shipyards, for aged ships without sufficient documentation. Some data can be draw by measurements; e.g. shaft line dimensions or intermediate bearings' reactions. Other data (stern tube bearing load, real axis of shaft line) have to be determined on the base of calculations. Author proposed combined experimental-analytical method for identified and optimization (correction) some existing parameters and checking power transmission system’s foundation. Specialised software (based on Finite Element Method) has been developed for shaft line alignment calculations. Main novelties of the software are elastic supports (model of bearings – boundary conditions) of the shaft line, continuous support as a model of stern tube bearing and influence coefficients calculations. An example analysis with discussion has been performed for cargo ships with medium-speed main engine. Multi-variant computations supported by measurements of the ships’ shaft line have been carried out. Changes in shaft line alignment have been proposed in order to increase reliability of propulsion system.
Źródło:
Journal of KONES; 2016, 23, 1; 247-254
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonium Dodecahydrododecaborate (NH4)2[B12H12]: Hydrogen and Boron Rich Fuel for Jet Propulsion Engines
Autorzy:
Jadhav, Pandurang M.
Patil, Jay
Prasanth, Hima
Rao, Gururaja
Powiązania:
https://bibliotekanauki.pl/articles/27788219.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
jet propulsion
boranes
boron
combustion
specific impulse
Opis:
There is dire need for the exploration of boron (B) substitution in jet propulsion engines for improving their combustion characteristics. In this regard, ammonium dodecahydrododecaborate (NH4)2[B12H12] has been synthesized, characterized and evaluated for its propulsion characteristics. This hydrogen and boron-rich entity was found to be a potential candidate for future applications in propulsion technology.
Źródło:
Central European Journal of Energetic Materials; 2022, 19, 2; 158--167
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of determination of feasible propeller forces and moments for an underwater robot
Metoda wyznaczania dopuszczalnych sił napędowych i momentu napędowego dla robota podwodnego
Autorzy:
Garus, J.
Powiązania:
https://bibliotekanauki.pl/articles/279322.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
underwater robot
hydrodynamic thrust allocation
propulsion system
Opis:
The paper presents procedure for the optimal allocation of thrust for horizontal motion of underwater robotic vehicles. Computation of propeller thrusts from propelling forces and moments is an optimisation problem based on a model, which the simplest form is unconstrained. In practice, however, where physical limitations must be taken into account, the obtained in such a way solution can be unrealistic. To cope with those difficulties, an algorithm for evaluation of the capacity of a propulsion system to produce required forces and moments and, if necessary, finding their feasible values is proposed. Due to computational simplicity, such an approach is a good solution in real-time applications. A numerical example is provided to demonstrate effectiveness and correctness of the approach.
Praca dotyczy zagadnienia rozdziału mocy w układzie napędowym robota. podwodnego. Dla ruchu w płaszczyźnie poziomej wektor naporów f wyznaczany jest na podstawie wektora zadanych sił i momentów napędowych T d. Zadanie to rozpatrywane jest najczęściej jako problem optymalizacyjny bez ograniczeń. Otrzymane w ten sposób rozwiązanie zapewnia wygenerowanie żądanych wartości T d tylko wtedy, gdy nie występuje żądanie rozwinięcia przez którykolwiek z pędników naporu przekraczającego wartość graniczną. Jeżeli ma to miejsce, to żądane siły i moment nie mogą być wytworzone. Stąd proponuje się realizację procedury rozdziału mocy dwuetapowo. W etapie pierwszym następuje ocena możliwości wytworzenia przez układ napędowy zadanych sił i momentu T d i wyznaczane są ich wartości dopuszczalne T~, tj. takie, które możliwe są do wygenerowania. W etapie drugim, na podstawie T~, dokonywany jest właściwy przydział naporów na poszczególne pędniki. Zamieszczony w pracy algorytm wyznaczania dopuszczalnych sił napędowych i momentu napędowego opracowany został z ukierunkowaniem na jego praktyczne zastosowanie w układzie automatycznego sterowania robotem podwodnym "Ukwiał", eksploatowanym na okrętach Marynarki Wojennej.
Źródło:
Journal of Theoretical and Applied Mechanics; 2005, 43, 4; 841-853
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal of turbine propulsion for a new generation liquefied natural gas carrier with a capacity of 250 000-- 300 000 cbm
Propozycja napędu turbinowego zbiornikowca nowej generacji do przewozu skroplonego gazu naturalnego o ładowności 250 000 do 300000 m3
Autorzy:
Górski, Z.
Cwilewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/243207.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
LNG tanker propulsion
liquefied gas tankers
Opis:
Liquefied natural gas carriers (LNG carriers) are built nowadays with the capacity of 135,000 division sign 165,000 cbm. LNG carriers with capacity of about 200,000 cbm are also in project works and under construction. Projects of new generation LNG carries with the capacity ranging from 250,000 to 300,000 cbm will be executed soon. Estimated main propulsion power of such LNG carriers will be 40 to 50 MW. The gas turbine propulsion with carried natural gas used as a fuel is proposed for these ships. To improve efficiency of propulsion a COGES (Combined Gas Turbine and Steam Turbine Integrated Electric Drive System) propulsion system is suggested. With the relatively simple configuration, the COGES system makes possible to achieve acceptable propulsion efficiency. COGES drive system also simplifies operation of propulsion plant, decreases engine room space and considerably contributes to environment protection as natural gas is considered to be an "ecological fuel". In particular the schema of the COGES propulsion system, ccomparison of machinery space of LNG carrier propelled by the low speed diesel engine and the COGES system are presented in paper.
Obecnie eksploatowane i budowane zbiornikowce do przewozu skroplonego gazu naturalnego LNG posiadają ładowność rzędu 135.000 do 165.000 m3. Projektowane są też i budowane zbiornikowce LNG o ładowności rzędu 200000 m3. W niedługim czasie będą realizowane projekty zbiornikowców LNG nowej generacji o ładowności 250.000 do 300.000 m3. Ocenia się, że zapotrzebowanie mocy napędu głównego dla nowej generacji zbiornikowców LNG będzie rzędu 40 do 50 MW. Proponuje się zastosowanie do napędu takich statków turbin gazowych zasilanych przewożonym gazem naturalnym. Celem podniesienia sprawności siłowni proponuje się zastosowanie siłowni kombinowanej typu COGES (Combined Gas Turbine and Steam Turbine Integrated Electric Drive System), która przy stosunkowo prostej konfiguracji umożliwi uzyskanie akceptowalnej sprawności napędu. Siłownia typu COGES pozwoli też na uproszczenie procesu eksploatacji napędu, zmniejszenie objętości siłowni na rzecz przestrzeni ładunkowej, a spalanie gazu naturalnego powszechnie uważanego za "paliwo ekologiczne" będzie ważnym przyczynkiem do ochrony środowiska naturalnego. W szczególności schemat układu napędowego typu COGES, porównanie wielkości siłowni zbiornikowca LNG z napędem tłokowym silnikiem spalinowym wolnoobrotowym i napędem typu COGES są prezentowane w artykule.
Źródło:
Journal of KONES; 2007, 14, 2; 179-186
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the probability of propulsion loss by a seagoing ship based on expert opinions
Autorzy:
Brandowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/258638.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship
loss of propulsion
probability
estimation
expert
Opis:
The event of the loss of propulsion function has been defined as hazardous event to a seagoing ship. It has been formalized. The procedure of acquisition of expert opinions on frequency of the event occurrence has been described. It may be considered to be of a numerical-fuzzy character. The fuzzy part was transferred to the numerical form by the pair comparison method. An example of the ship propulsion system comprising a low speed internal combustion engine and a fix pitch propeller illustrates the method presented. It may be used wherever a hazard analysis has to be performed of a system involving human and technical aspects and there is a shortage of objective data on the investigated object.
Źródło:
Polish Maritime Research; 2009, 1; 73-77
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Liquid micro pulsed plasma thruster
Autorzy:
Szelecka, A.
Kurzyna, J.
Daniłko, D.
Barral, S.
Powiązania:
https://bibliotekanauki.pl/articles/146591.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electric propulsion
pulsed plasma thruster
liquid propellant
Opis:
A new type of pulsed plasma thruster (PPT) for small satellite propulsion is investigated, of which the most innovative aspect is the use of a non-volatile liquid propellant. The thruster is based on an open capillary design. The thruster achieved a thrust-to-power ratio above 45 μN/W, which constitutes a 5-fold improvement over the water-propelled pulsed plasma thruster, and which is also slightly above the performance of a similarly sized PPT with a solid propellant.
Źródło:
Nukleonika; 2015, 60, 2; 257-261
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing the lever propelling system for manual wheelchairs
Autorzy:
Choromański, W.
Fiok, K.
Dobrzyński, G.
Powiązania:
https://bibliotekanauki.pl/articles/201679.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wheelchair
levers
lever-drive
optimization
propulsion
pushing
Opis:
The article concerns the optimization of manual wheelchairs with a lever propelling system. Lever-driven manual wheelchairs are a promising wheelchair group, however they still need to be improved in order to compete successfully with classic manual push rim-driven wheelchairs. Also, despite all manual wheelchairs human work efficiency during propulsion plays an important role, there is not enough research carried out that would focus on this problem regarding lever-driven wheelchairs. The research, presented in this paper, according to the authors' intention, is to make this knowledge gap smaller. The article describes an analytical optimization method for adjusting important lever-drive system parameters - levers length and its axis of rotation position - to individual human anthropometry. The method is based on experimental data regarding maximum human push capabilities acquired in another study. The optimized parameters' values were determined after assessment of maximum human expendable energy during a single work phase (pushing the levers). As a result of this study authors determined optimal levers length and their axis of rotation position for a 50 percentile French male. The carried out research shows also, that the suboptimal area for positioning the levers axis of rotation is relatively wide.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 793-800
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Types and applications of hydrogen fuel cells in transport
Autorzy:
Gallas, Dawid
Stobnicki, Paweł
Bolzhelarskyi, Yaroslav
Powiązania:
https://bibliotekanauki.pl/articles/32101699.pdf
Data publikacji:
2022-12-28
Wydawca:
Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
Tematy:
fuel cells
hydrogen fuel
hydrogen propulsion
transport
Opis:
The article summarizes the types of hydrogen sources and the possibilities of using hydrogen in fuel cell technologies. The types of hydrogen fuel cells and solutions used in hydrogen powered drives were discussed. The current economic and ecological aspects affecting the possibilities and profitability of using various types of hydrogen as an alternative fuel in various forms of transport were analyzed, and forecasts for the development of this form of propulsion and power supply in transport for the coming years were presented. It was concluded that only a simultaneous increase in hydrogen production, through an increase in demand or technological development, combined with a decrease in the cost of hydrogen cells down to a level of at least $40/kW, would enable the proliferation of hydrogen technologies in all modes of transport.
Źródło:
Rail Vehicles/Pojazdy Szynowe; 2022, 3-4; 31-36
0138-0370
2719-9630
Pojawia się w:
Rail Vehicles/Pojazdy Szynowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coefficients of Propeller-hull Interaction in Propulsion System of Inland Waterway Vessels with Stern Tunnels
Autorzy:
Kulczyk, J.
Tabaczek, T.
Powiązania:
https://bibliotekanauki.pl/articles/117051.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Propulsion System
Inland Waterway Vessel
Stern Tunnels
Ship Propulsion
Propeller-Hull Interaction
Hydrodynamics
ANSYS Fluent
hull efficiency
Opis:
Propeller-hull interaction coefficients - the wake fraction and the thrust deduction factor - play significant role in design of propulsion system of a ship. In the case of inland waterway vessels the reliable method of predicting these coefficients in early design stage is missing. Based on the outcomes from model tests and from numerical computations the present authors show that it is difficult to determine uniquely the trends in change of wake fraction and thrust deduction factor resulting from the changes of hull form or operating conditions. Nowadays the resistance and propulsion model tests of inland waterway vessels are carried out rarely because of relatively high costs. On the other hand, the degree of development of computational methods enables’ to estimate the reliable values o interaction coefficients. The computations referred to in the present paper were carried out using the authors’ own software HPSDKS and the commercial software Ansys Fluent.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 3; 377-384
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary study of an airplane for electric propulsion testing at high altitudes
Autorzy:
Galinski, C.
Powiązania:
https://bibliotekanauki.pl/articles/246733.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
electric propulsion
flight testing
unmanned aerial vehicle
Opis:
Technology of photovoltaic cells and lithium batteries is being developed rapidly. As a result, attempts to build solar High Altitude Long Endurance (HALE) airplanes are more and more frequent. In the future, such airplanes may appear very useful for the economy because they may replace geostationary satellites in several applications. Unfortunately, data on altitude effect on photovoltaic cells and batteries performance are not easily available. Moreover, acquisition cost of cells is very high. Therefore, a tool for inexpensive testing of cells is needed. This article shows a study of very light unmanned airplane that could be used as a testbed for this purpose. Weight assumptions are presented together with concept of geometry and aerodynamic characteristics. Propulsion system is proposed, so also airplane performance is estimated. Finally, results are discussed leading to the conclusion. It appears that unmanned airplane with maximum take-off weight of 1.3 kg can climb to the altitude of 10 km within 4 hours during sunny summer day about the noon. However, only 30% of such days can be used because of strong winds blowing at high altitudes, quite small optimal airspeed of the airplane and constraints due to Air Traffic Management. Moreover, application of variable pitch propeller is recommended as well as some kind of take-off assist. For example, towing or take-off from the hill is desirable to avoid threats resulting from small climb rate.
Źródło:
Journal of KONES; 2018, 25, 3; 167-174
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An algorithm for determining permissible control inputs to unmanned Underwater Robotic Vehicle (URV) fitted with azimuth propellers
Autorzy:
Garus, J.
Powiązania:
https://bibliotekanauki.pl/articles/259529.pdf
Data publikacji:
2005
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underwater vehicle
propulsion system
azimuth propeller
control
Opis:
The paper deals with synthesis of automatic control system for an unmanned underwater robotic vehicle. The problem of determining permissible propulsive forces and moments necessary for optimum power distribution within a propulsion system composed of azimuth propellers (rotative ones). To allocate thrusts the unconstrained optimization method making it possible to obtain a minimum-norm solution, was applied. A method was presented for assessing propulsion system capability to generate propulsive forces (set control inputs). For the case of lack of such capability an algorithm was proposed making modification of their values and determination of feasible propulsive forces (i.e. permissible control inputs), possible. A numerical example which confirmed correctness and effectiveness of the proposed approach, was also attached.
Źródło:
Polish Maritime Research; 2005, 4; 26-31
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis 0f characteristics of ship gas turbine propulsion system (in the light of the requirements for ship operation in the Baltic Sea)
Autorzy:
Domachowski, Z.
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/962803.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion system
gas turbines
environment protection
Opis:
The paper concerns a propulsion system of merchant ships intended for sailing in the Baltic Sea zone. Such system is to satisfy the ecological requirements determined by relevant international conventions for special zones to which the Baltic Sea also belongs. The paper draws attention to gas turbine used as a prime mover for such ships, because it satisfies the ecological requirements and has also other advantages. Application of gas turbine for ship powering does not require exhaust gas to be purified, however it requires fuel oils of a low sulphur content to be used. If the ecological rules impose the using of the fuel oils of similar quality for diesel engines then gas turbine propulsion system will be comparable - also economically (regarding specific fuel oil consumption cost) - with that of diesel engine. It would be even more favourable in a combine gas turbine /steam turbine system, especially at compound production of electric and heat energy (i.e. COGES systems). In the Baltic Sea zone gas turbines willfind application to powering a. o. such ships as : fast car-passenger ferries, fast cargo ships, special vehicles (hydrofoils, hovercraft, motor yachts).
Źródło:
Polish Maritime Research; 2004, S 1; 73-78
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Elaboration of the Method of Fatigue Testing of the Rotor of the Mosups Plane Propulsion System
Autorzy:
Głowacki, D.
Rodzewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/97933.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
UAV
propulsion system
stress analysis
fatigue tests
Opis:
This paper concerns fatigue testing of the rotor of the propulsion system for the MOSUPS – an unmanned aircraft designed in a joint wing configuration, and equipped with a ducted propeller. The work presents the analysis of the stresses and deformations of the rotor structure as well as the form of the loading cycle. The aim of the paper is to introduce the concept of a simplified method of fatigue testing of multi-blade rotors. With the sophisticated geometry of the rotor in mind – the authors applied the FEM tools and implemented the ANSYS and nCode programs. The prototype of the fatigue stand built by the authors is also presented in the paper.
Źródło:
Fatigue of Aircraft Structures; 2016, 8; 97-103
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical evaluation of propriety of measurements of ship’s movement parameters
Autorzy:
Charchalis, A.
Polanowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/244984.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnostics
vessel’s propulsion systems
ship propulsion characteristics for ships with fixed propeller modelling
determination of power characteristics
Opis:
The paper presents some problems of carrying out measurements of energetic characteristics and vessel’s performance in the conditions of sea examinations. As the object of propulsion characteristic determination was selected the ship with fixed pitch propeller. In order to formulate models of power characteristics, in first, known physical aspect were taken and subsequently statistic theory was implemented. Models of propulsion performance were built basing on two theoretical methods of determination of required shaft power and torque at a hub, as the function of propeller’s revolutionary speed and sailing condition represented by dimensionless coefficients. Model number one, based on Silukov method presents function with variable power index, of shaft power in domain of revolutionary speed. The second one presents model of torque variations, based on Silovic – Fancev method. For verification of models were taken presented in available bibliography, results of researches of ship’s propulsion systems [6]. We also discuss the manner of reducing the results of measurements to the standard conditions. We present the way of preparing propulsion characteristics and the analysis of examination uncertainty for the measurement of torque. Statistical analysis of deviation of results, using three models, proposed in the paper. As a result of analysis, one point from primary data set was rejected due to its unreliability, what was resulting with higher adequacy of characteristics.
Źródło:
Journal of KONES; 2016, 23, 1; 83-89
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes of a freely drifting vessel
Autorzy:
Jurdziński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1841585.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
freely drifting vessel
safety of navigation
loss of propulsion
lack of propulsion
grounding
restricted area
drifting
vessel's drift
Opis:
The article describes the rules for planning a ship's navigation in the event of loss of propulsion. A disabled ship drifting freely at sea is a potential danger to the crew and the marine environment. Lack of propulsion means that the ship cannot give way to other ships/keep out of the way of another vessel. One of the main elements of danger for a drifting ship is the possibility of grounding in restricted areas. The aim of the article is to draw the attention of navigators to the dangers to navigation resulting from ships drifting without their own propulsion, disabled ships.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 3; 687-693
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recommendations for Training of Crews Working on Diesel-Electric Vessels Equipped with Azimuth Thrusters
Autorzy:
Pipchenko, O. D.
Tsymbal, M.
Shevchenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/116343.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
diesel-electric vessels
azimuth thrusters
crew training
ship propulsion
power plant system
azimuth propulsion
risk matrix
emergency steering
Opis:
This study addresses the problem of training the officers, which are assigned to an electrical-driven vessels equipped with azimuth thrusters. A pair of omnidirectional thrusters in combination with power plant system containing several diesel generators imply a potential for a variety of different emergency scenarios, which also includes partial or full loss of control or blackout. These fault scenarios were classified in the article with predefined risk levels depending on the area, time limitation, mode of operation and fault itself. Mutual responsibilities and action algorithms for bridge and engine teams in a step-by-step manner have been developed for each scenario. Personnel behavioral differences in both expected and unexpected emergencies have also been studied.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 567-571
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza możliwości odzyskiwania energii przez elektryczny układ napędowy pojazdu do przewozu osób na potrzeby autobusowego transportu zbiorowego komunikacji miejskiej
Analysis of the possibility of energy recovery by the vehicle electric drive system for the carriage of persons for the bus of collective urban communication
Autorzy:
Biernacki, Marcin
Majewski, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/2056432.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
autobus elektryczny
napęd elektryczny
electric bus
electric propulsion
Opis:
W pracy omówiono sposoby odzyskiwania oraz magazynowania energii wytworzonej podczas hamowania pojazdu przeznaczonego do zbiorowego transportu pasażerskiego na terenach miejskich. Przeanalizowano pracę elektromechanicznego układu napędowego z pojedynczym oraz z dwoma współpracującymi zasobnikami (magazynami) energii. Badano układ napędowy zasilany ze źródła bądź źródeł energii o różnych pojemnościach przewidzianych odpowiednio do wariantów przejazdu trasą testową, będącą odpowiednikiem jednej z rzeczywistych tras obsługiwanych przez zakłady komunikacji miejskiej. Przeanalizowano trwałość głównego i współpracującego z nim pomocniczego źródła zasilania oraz magazynowania energii odzyskanej podczas hamowania pojazdu. Przeanalizowano wybrane warunki opłacalności odzyskiwania energii.
The document describes methods of recovering and storing energy generated during breaking a vehicle intended for collective passenger transport in urban areas. The work of the electromechanical drive system with single and with two cooperating energy storage (storages) units was analyzed. A propulsion system powered from a source or sources of energy with different capacities provided for the test route variants, that are the equivalent of one of the real routes served by public transport plants, was tested. The durability of the main and cooperated auxiliary power source, operated as the storage of energy recovered during vehicle braking, was analyzed. Selected profitability conditions for energy recovery were analyzed.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2021, 1, 125; 53--59
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of ships engine effective power, fuel consumption and emission using the vessel speed
Autorzy:
Borkowski, T.
Kasyk, L.
Kowalak, P.
Powiązania:
https://bibliotekanauki.pl/articles/247151.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ships
main propulsion
marine diesel engine
exhaust emission
Opis:
Currently, the Baltic Sea States suggests a proposal to designate the Baltic Sea as an Emission Control Area for nitrogen oxides, in accordance with Annex VI of MARPOL73/78. The emission would be estimated on the data produced by the AIS (Automatic Identification System) system that is compulsory for ships. Therefore, exhaust emission of the ships' can be computed using the actual speed and main propulsion shaft power. Mostly, main propulsion engines' exhaust emission is dependent to realistic performance and can be determined. The research plan has been prepared, aimed an evaluating the main propulsion engine performance and emissions. In cooperation with the ship owner, the experimental program onboard the container vessel, equipped with latest large bore, two-stroke, and slow speed MAN B&W electronic controlled engine was carried out. The records set of vessel speed and related engine shaft power, fuel consumption and exhaust emission for container vessel is formed. Taking into account; main engine performance, types of fuel and other input data, the emission factors were determined for ship sea service state. Main engine shaft power estimation and measurement setup, examples of main engine shaft power, the shaft power equation coefficients density, example of main engine service operation, fuel oil consumption group, the ship speed estimated form, example of main engine area operation influenced by weather conditions are presented in the paper.
Źródło:
Journal of KONES; 2011, 18, 2; 31-39
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of main dimensions and estimation of propulsion power of a ship
Autorzy:
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244443.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ship propulsion
Marine Power Plant
database
ship’ dimensions
Opis:
TEU number, which is the container ships’ crucial designing factor, directly influences the main hull dimensions such as displacement V , length L, breadth B, draught T, their combinations and block coefficient CB. The main dimensions have a great impact on developing the ships resistant performance. Thus, it is really fundamental to establish the correct dimensions of the hull during the design and ship building process. Estimating the shape of the ship’s hull, that comprises its main dimensions, is one of the basic tasks as part of the preliminary design stage. The most significant decisions determining ships performance, its duration and building costs are made at the beginning of the preliminary stage, when the costs are relatively low. It is important to limit the total ship resistance, for instance, by lowering the wave ship resistance as much as possible, especially when the operational speed and TEU number carried by one vessel is increasing. That resistance depends on the operational speed expressed by Froude number. The resistance criteria and the existing hull dimensions limits, resulting from ships route, must be taken into consideration bearing in mind safety conditions such as ships stability and seaworthiness, when the main ships dimensions are being determined. In the paper are presented general rules for calculations of ship’s hull principle dimensions and total power of engines of container ship 1300TEU and 18 kn at preliminary stage of design process.
Źródło:
Journal of KONES; 2014, 21, 2; 39-44
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assembling of bearing sleeve on ship propulsion shaft by using EPY resin compound
Autorzy:
Grudziński, K.
Grudziński, P.
Jaroszewicz, W.
Ratajczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/259011.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
bearing sleeve
propulsion shaft
assembling
EPY resin compound
Opis:
This paper presents an original novel solution of the problem of assembling a large bearing sleeve (of about 1000 mm in diameter) on ship propulsion shaft by using EPY resin compound. The problem is discussed on the concrete example dealing with a ship under repair. Design project of assembling the sleeve on the shaft by using the resin compound, model research on its casting process as well as assembling technology of the sleeve on the shaft, are presented and a practical way of realization of the project in conditions of a Chinese ship repair yard, is also highlighted. During more than three-year-long operation the solution has standed the test of time without any complaint.
Źródło:
Polish Maritime Research; 2012, 2; 49-55
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of marine risers subjected to shoal/deep water in the installation process
Autorzy:
Wang, Yikun
Luo, Songxiang
Yang, Mo
Qin, Tao
Zhao, Jing
Yu, Gang
Powiązania:
https://bibliotekanauki.pl/articles/32899597.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sail catamaran
green shipping
zero emission
hybrid propulsion
Opis:
The dynamics of the installation process of marine risers subjected to shoal/deep seawater is studied. The riser is assumed to be a cantilevered Euler‒Bernoulli beam. The upper end of the riser is clamped on the vessel or the drilling platform. The lower end of the riser is connected to the Blowout Preventer Stack (BOPs) and Lower Marine Risers Package (LMRP). The lateral fluid forces induced by the sea wave and sea current are introduced into the governing equations of motion. The lateral displacement and stress distributions of the riser are obtained by solving the governing equation of the riser via Galerkin’s discretisation scheme and a fourth-order Runge‒Kutta algorithm. The results indicate that the riser exhibits different behaviours under various depths because of the different distributions of the flow velocity ranging from the sea surface to the seabed. In the case of shoal water, the dynamics of the riser are dominated by the sea wave, while in the case of deep water it is affected mainly by the sea current velocity and sea surface wind velocity.
Źródło:
Polish Maritime Research; 2022, 2; 43-54
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sail catamaran with hybrid propulsion, design, theoretical and experimental studies
Autorzy:
Litwin, Wojciech
Piątek, Daniel
Leśniewski, Wojciech
Marszałkowski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/32900237.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sail catamaran
green shipping
zero emission
hybrid propulsion
Opis:
The development of modern lithium batteries and propulsion systems now allows the use of complex propulsion systems for vessels of various sizes. As part of the research and implementation project, a parallel hybrid drive system was designed, built and then tested in the laboratory. The experimental studies conducted allowed for the measurements of power, fuel consumption and electric power distribution in various operating modes of the propulsion system. The research proves that in the analysed case, the hybrid parallel system meets the demand for electric energy during a typical cruise scenario, and thus there is no need to install a power generator on the yacht.
Źródło:
Polish Maritime Research; 2022, 2; 12-18
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy balance comparison of small unmanned vehicle equipped with electric and hybrid propulsion system
Autorzy:
Polak, Filip
Powiązania:
https://bibliotekanauki.pl/articles/2097465.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
hybrid propulsion
unmanned ground vehicle
UGV
electric propulsion
energy balance
napęd hybrydowy
bezzałogowy pojazd naziemny
napęd elektryczny
bilans energetyczny
Opis:
Article presents comparison of the energetic balance of vehicle powertrain - pure electric vehicle and vehicle equipped with electric hybrid power transmission. Society is more and more often persuaded to buy electric cars as an environmentally friendly solution because they have opinion of ecological vehicles. Electrification in military applications is also widely considered, especially in case of small to medium UGV’s such as wide range of robotic systems introduced to the milatary operations. The article presents the problems of comparing the efficiency and others parameters such as the range of a two presented powertrains. The research was carried out on an small unmanned land platform equipped with a hybrid propulsion system supplied as standard with Diesel power generator and electrically only powered. Energy used for charging of the battery, from tank-to-wheel, was calculated. This also enables to calculate total efficiency of electric and hybrid power transmission. By calculating different capacity of battery and power of generator, it is possible to determine the vehicle range.
Źródło:
Combustion Engines; 2020, 59, 3; 23--27
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3E - A new paradigm for the development of civil aviation
Autorzy:
Orkisz, Marek
Kuźniar, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2097457.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
airplane
electric propulsion
hybrid propulsion
distributed propulsion
reduction of emission exhaust
reduction of noise
decrease of fuel consumption
samolot
napęd elektryczny
napęd hybrydowy
napęd rozproszony
redukcja emisji spalin
redukcja hałasu
zmniejszenie zużycia paliwa
Opis:
Nowadays, in civil aviation, issues related to improving efficiency, reducing the costs of air operations as well as the negative impact of air transport on the environment are of increasing importance. These ideas allow the formulation of the paradigm relating to the development of air transport - ‘more Efficiently, more Economically, more Eco-friendly - 3E’. The article presents in a cross-sectional and synthetic way research conducted by leading scientific centres around the world as well as prototype aviation constructions designed by companies from the aviation industry. Benefits and disadvantages of future propulsions, such as purely electric, hybrid and distributed propulsions, were presented. Conclusions were formulated regarding further possible directions of civil aviation development, taking into account the improvement of its efficiency as well as economic and ecological indicators.
Źródło:
Combustion Engines; 2020, 59, 2; 3--10
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerodynamic Research of the Overpressure Device for Individual Transport
Autorzy:
Magryta, P.
Powiązania:
https://bibliotekanauki.pl/articles/118177.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
aviation propulsion
CFD
3D structure
aerodynamic drag
Opis:
Paper proposes a solution of overpressure device for individual transport, the purpose of which is to accumulate the overpressure in a certain geometric area, through the use of specially designed three-dimensional structures. In order to verify the underlying assumptions of the idea, it was decided to perform a simulation study of air flow stream within the proposed unit. These studies were done in Star CD – Pro Star 3.2 software. Further studies were carried out on the actual real model. The verification was performed to compare and identify the main parameters of air flow through the three-dimensional structure.
Źródło:
Applied Computer Science; 2017, 13, 1; 5-19
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza rozwiązań technicznych napędu głównego śródlądowych jednostek pływających w aspekcie bezpieczeństwa żeglugi i ekologii
Analysis of technical solutions for main propulsion inland vessels navigation safety and ecology
Autorzy:
Łosiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/314496.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
ochrona środowiska
żegluga
napęd
environment protection
shipping
propulsion
Opis:
W artykule omówiony został problem napędu głównego śródlądowych jednostek pływających w aspekcie bezpieczeństwa żeglugi i ekologii. Przedstawiono przykładowe rozwiązanie techniczne spełniające wymagania bezpieczeństwa żeglugi i przepisów ochrony środowiska.
Paper discussed the problem of main propulsion inland waterway vessels in terms of shipping safety and ecology. This is an example of a technical solution that meets shipping safety and environmental regulations.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 6; 308-311, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method of power distribution in the power transmission system of a remotely operated vehicle
Rozdział mocy w układzie napędowym zdalnie sterowanego pojazdu podwodnego
Autorzy:
Garus, J.
Powiązania:
https://bibliotekanauki.pl/articles/282065.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
underwater vehicle
power transmission system
distribution of propulsion
Opis:
The paper addresses a method of distribution of propulsion for an unmanned underwater vehicle. The method is developed on basis of the decomposition of a configuration matrix describing the layout of thrusters in a power transmission system. The proposed solution of power distribution is worked out for the control system of the remotely operated vehicle "Ukwiał" designed and built for the Polish Navy. The algorithm has been tested for track-keeping control both for faultless work of thrusters and failure of one of them. Some computer simulations are provided to demonstrante the effectiveness and correctness of the approach.
W pracy przedstawiono sposób rozdziału mocy w układzie napędowym bezzałogowego pojazdu podwodnego. Do rozwiązania zadania dystrybucji naporów na poszczególne pędniki wykorzystano rozkład macierzy konfiguracji pędników względem wartości szczególnych. Zamieszczono algorytmy rozdziału mocy dla sprawnego układu napędowego, jak i dla stanu awarii jednego z pędników. Metoda rozdziału mocy została opracowana z uwzględnieniem jej praktycznego zastosowania w układzie sterowania zbudowanego dla potrzeb Marynarki Wojennej zdalnie sterowanego pojazdu podwodnego typu "Ukwiał". Zamieszczono wyniki badań symulacyjnych ruchu pojazdu, ze sprawnym i uszkodzonym układem napędowym, przemieszczającego się po zadanej trajektorii w płaszczyźnie poziomej.
Źródło:
Journal of Theoretical and Applied Mechanics; 2004, 42, 2; 239-251
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen Peroxide as a High Energy Compound Optimal for Propulsive Applications
Autorzy:
Rarata, G.
Rokicka, K.
Surmacz, P.
Powiązania:
https://bibliotekanauki.pl/articles/358739.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
hydrogen peroxide
HTP
explosibility
detonability
monopropellant
oxidizer
propulsion
Opis:
This paper presents the authors’ experience in the field of the safe preparation and utilisation of HTP (98%+), a storable propellant that is finding use in various engineering applications. Brief characterisations of the material as well as examples of its potential use within relevant industries are provided. Additionally, some of the existing data and current research are included to demonstrate the full potential of this material which meets most of the needs of the propulsion industry. The laboratory technique for obtaining the substance that has been developed recently at the Institute of Aviation is briefly described. Utilisation of the method based on a special glass apparatus allows reproducible amounts of the substance to be obtained with relatively little risk.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 3; 778-790
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ballistic Analysis of Missile Propulsion in a Perforated Barrel Launcher
Autorzy:
Surma, Zbigniew
Leciejewski, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/1062726.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
mechanics
internal ballistics
rocket propulsion system
perforated barrel
Opis:
This study presents a ballistic analysis of the propulsion of a smart counter-projectile in an active protection system. In order to reduce the pressure of the propellant gases inside the semi-closed barrel of the launcher and to mitigate the effects of the recoil of the launcher, a perforated barrel was chosen. For the system considered, a physical model and a mathematical model of the propulsion of a rocket projectile in a perforated barrel, as well as a computer program, were developed. The gas pressures inside the combustion chamber of the rocket engine and the barrel, as well as the velocity and travel of the missile are the main results from the solution of the presented mathematical model. Based on the resulting calculations, the influence of the holes in the perforated barrel on the operating conditions of the rocket engine, as well as the pressure of propellant gases and the missile velocity inside the barrel were analysed. The use of a perforated barrel caused a significant reduction in the total impulse of the propellant pressure inside the barrel. Based on experimental tests of the barrel launcher-missile assembly, a decrease (about 50%) in the muzzle velocity of the missile was observed. The mathematical model of the interior ballistics presented here allows the missile propulsion, both in a monolithic- as well as a perforated barrel-launcher, to be investigated.
Źródło:
Central European Journal of Energetic Materials; 2020, 17, 4; 475-491
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of a hybrid manual - electric wheelchair propulsion system on the users muscular effort
Autorzy:
Wieczorek, Bartosz
Warguła, Łukasz
Kukla, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/2204666.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
assistive technology
wheelchair
electromyogram
EMG
electric propulsion
control
Opis:
Self-propelled wheelchairs favour the rehabilitation process, forcing the user to be physically active. Unfortunately, in most cases, the manual propulsion is not adapted to the individual needs and physical capabilities of the user. This paper presents the results of operational tests of a wheelchair equipped with a hybrid propulsion system in which the muscle strength generated by the user is assisted by two independent electric motors. The research aimed to investigate the influence of the applied control algorithm and the assistance factor (W) on the value of the muscular effort (MA) while propelling the wheelchair with the use of push rims. A modified ARmedical AR-405 wheelchair equipped with two MagicPie 5 electric motors built into the wheelchair’s hubs with a power of 500 W was used in this research. The tests were carried out on a wheelchair test bench simulating the moment of resistance within the range of 8–11 Nm. Surface electromyography was employed for the measurement of MA, specifically, a four-channel Noraxon Mini DTS apparatus. The research was carried out on five patients from the group of C50 anthropometric dimensions. The effort was measured for four muscles: deltoid–anterior part, deltoid–posteriori part, and triceps brachii and extensor carpi radialis longus. The effectiveness of the hybrid propulsion system was observed based on the extensor carpi radialis longus muscle. In this case, for the standard wheelchair, the MA ranged from 93% to 123%. In contrast, for a wheelchair equipped with the hybrid propulsion system, at W = 70%, the MA was within the range of 43%–75%.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 1; 28--34
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognozowanie charakterystyk napędowych statku ze śrubą stałą podczas pływania w zmiennych warunkach pogodowych
Prediction of Propulsion Performance of a Ship with Fixed-Pitch Propeller in Variable Weather Conditions
Autorzy:
Szelangiewicz, T.
Żelazny, K.
Powiązania:
https://bibliotekanauki.pl/articles/359720.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
charakterystyki napędowe statku
praca napędu w zmiennych warunkach pogodowych
EXPLO-SHIP 2004
ship propulsion characteristics
propulsion operation in variable weather conditions
Opis:
Przedstawiono algorytm umożliwiający numeryczne obliczanie charakterystyk napędowych statku. Charakterystyki te uzupełniono o wykresy całkowitego oporu w określonych warunkach pogodowych. Podano różne możliwości wyboru punktu pracy układu napędowego w zależności od przyjętych kryteriów.
The article presents an algorithm for the numerical calculation of ship propulsion characteristics. The propulsion characteristics were completed with total resistance charts for given weather conditions. Alternative choices of the propulsion working point depending on assumed criteria were discussed.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 1 (73); 489-498
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy analysis of the propulsion shaft fatigue process in a rotating mechanical system part III dimensional analysis
Autorzy:
Korczewski, Zbigniew
Marszałkowski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/1573606.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion shaft
dimensional analysis
Buckingham theorems
similarity criteria
Opis:
This article presents the third and last part of the problem of diagnosing the fatigue of marine propulsion shafts in terms of energy with the use of the action function, undertaken by the authors. Even the most perfect physical models of real objects, observed under laboratory conditions and developed based on the results of their research, cannot be useful in diagnostics without properly transferring the obtained results to the scale of the real object. This paper presents the method of using dimensional analyses and the Buckingham theorem (the so-called π theorem) to determine the dimensionless numbers of the dynamic similarity of the physical model of the propulsion shaft and its real ship counterpart, which enable the transfer of the results of the research on the energy processes accompanying the ship propulsion shaft fatigue from the physical model to the real object.
Źródło:
Polish Maritime Research; 2021, 2; 72-77
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of combustion and propulsion processes of a new concept gun using a gaseous propellant
Autorzy:
Liu, N.
Deng, F.
Zhou, F.
Zhang, X.
Powiązania:
https://bibliotekanauki.pl/articles/279471.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
combustion light gas gun
interior ballistics
combustion and propulsion
Opis:
The combustion light gas gun (CLGG) uses a low molecular weight gas as the propellant to burn, expand and propel the projectile out of the barrel with higher muzzle velocities. In order to better understand the interior ballistic process of CLGG, an multidimensional combustion and flow model for CLGG is established. It contains unsteady Reynolds-averaged Navier-Stokes (RANS) equations, the RNG k-ε two equation turbulence models, and the Eddy-Dissipation Model (EDM) of combustion. Simulation of the interior ballistic process of CLGG is carried out with a propellant of hydrogen and oxygen mixture charged at a particular initial condition. Results show that the spherical front flames spread from the ignition points which divide the flow field as burned and unburned regions in the initial period and expand to the whole flow field subsequently. The filling error of propellants in the chamber will affect the interior ballistic performance, but the impact is relatively small.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 531-541
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary design of micro scale turbojet
Autorzy:
Czarnecki, M.
Orkisz, M.
Powiązania:
https://bibliotekanauki.pl/articles/248091.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
propulsion
micro gasturbines
preliminary micro gasturbine design
rc gasturbine
Opis:
During the development of the small gas turbine, the most important calculations comes from preliminary design process which gives a shape of airflow duct and limits available space for each component of the engine. Micro scale jet engines are not simply reduced-scale model of the full-size engines. The basic method of working is the same, but the are special considerations which demands a different approach to the main design. There are few similarities to the first generation of turbojets, for both critical dimensions comes from compressor and combustor. Micro gas turbine in the contrast to jet engines does not possess the mechanical coupling to the group of accessories. All accessories are electric driven. Small fuel pumps supply fuel line with pressure that hardly exceeds pressure that comes from compressor. The lubrication system is connected to the main fuel line. Bearings are lubricated with mixture of kerosene and turbine oil. Main difficulties in the process of preliminary design come from connecting of the each engine component. Narrow margin that consist limitations from rotational speed, overall dimensions, thermal and centrifugal loads ,overall efficiency and lack of knowledge about design process for small gasturbine makes up challenge for skilled designers.
Źródło:
Journal of KONES; 2008, 15, 3; 83-87
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ewolucja napędu okrętów podwodnych od połowy XX wieku
The evolution of submarine propulsion since the mid-twentieth century
Autorzy:
Kuźmicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/223101.pdf
Data publikacji:
2006
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
okręt podwodny
akumulatory
napęd jądrowy
submarine
batteries
nuclear propulsion
Opis:
W artykule przedstawiono rozwiązania uniezależniające napęd okrętów podwodnych od wykorzystania powietrza atmosferycznego. Opisano poszczególne rozwiązania układów siłowni okrętów podwodnych stosowane współcześnie. Opisano również wykorzystanie baterii akumulatorów na konwencjonalnych okrętach podwodnych.
The paper presents new propulsion system solutions which are not dependent on the use of the atmospheric air. These solutions are currently used in the „real life” on board of submarines. Another problem considered in this paper is the use of batteries within the submarines propulsion system solutions.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2006, R. 47 nr 3 (166), 3 (166); 43-60
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design Optimization of the Biomimetic Undulating Fin of a Knife Fish Robot
Autorzy:
Meera, A. A.
Sudheer, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/385260.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
mechanism
underwater robot
propulsion
optimization
biomimetic design
fish robot
Opis:
Median Paired Fin Propulsion used by fishes like knife fish, has the potential to replace current energy inefficient underwater propulsion systems. This paper quantizes the efficiency of a fin mechanism based on its ability to incorporate a large number of undulations. Characteristic ellipses of a mechanism were defined, based on which two algorithms were defined to measure the capabilities of the mechanism. The available workspace of the mechanism was optimized to accommodate the undulation requirements of the robot based on the formulations. Further, the distortion effect on the waveform was identified and the optimization was redefined to obviate its possibility while in operation.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2016, 10, 1; 26-33
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielokryterialny wektor efektywności napędu statku morskiego floty wsparcia marynarki wojennej
Multicriterial vector of efficiency of propulsion marine fleet of naval support
Autorzy:
Łosiewicz, Z.
Mironiuk, W.
Powiązania:
https://bibliotekanauki.pl/articles/314448.pdf
Data publikacji:
2017
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
efektywność napędu
transport
statek morski
efficiency of propulsion
ship
Opis:
W artykule omówiony został wielokryterialny wektor efektywności napędu statku morskiego - na przykładzie statków floty wsparcia marynarki wojennej.
In this paper we discuss the multi-criterion vector of maritime ship propulsion efficiency - on the example of ships navy support fleet.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 592-594, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Koncepcja systemu i działania zmierzające do utworzenia systemu wspierającego obsługiwanie okrętowych systemów napędowych
A Concept of and Actions Taken to Establish a System Supporting Maintenance of Marine Propulsion Systems
Autorzy:
Bielawski, P.
Powiązania:
https://bibliotekanauki.pl/articles/360602.pdf
Data publikacji:
2005
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
systemy napędowe
diagnozowanie
naprawy
OMiUO
propulsion systems
diagnosing
repairs
Opis:
W artykule przedstawiono prognozę rozwoju okrętowych systemów napędowych z uwzględnieniem paliw najbliższej przyszłości. Zaprezentowano koncepcję podsystemu wspierającego obsługiwanie obecnych i przyszłych systemów napędowych. Przedstawiono dotychczasowe osiągnięcia Akademii Morskiej w Szczecinie w zakresie budowy i wdrażania systemu wspierającego obsługiwanie okrętowych systemów napędowych.
The development of marine propulsion systems is prognosed in relation to the fuels of the near future. Presented is a concept of a subsystem supporting the maintenance of present and future propulsion systems. The author also demonstrates the achievements of the Maritime University of Szczecin in the designing and implementation of a system for marine propulsion system maintenance support.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 5 (77); 73-84
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal stability of the krypton Hall effect thruster
Autorzy:
Szelecka, A.
Kurzyna, J.
Bourdain, L.
Powiązania:
https://bibliotekanauki.pl/articles/148243.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
thermal stability
electric propulsion
Hall thruster
xenon
krypton propellants
Opis:
The Krypton Large IMpulse Thruster (KLIMT) ESA/PECS project, which has been implemented in the Institute of Plasma Physics and Laser Microfusion (IPPLM) and now is approaching its final phase, was aimed at incremental development of a ~500 W class Hall effect thruster (HET). Xenon, predominantly used as a propellant in the state-of-the-art HETs, is extremely expensive. Krypton has been considered as a cheaper alternative since more than fifteen years; however, to the best knowledge of the authors, there has not been a HET model especially designed for this noble gas. To address this issue, KLIMT has been geared towards operation primarily with krypton. During the project, three subsequent prototype versions of the thruster were designed, manufactured and tested, aimed at gradual improvement of each next exemplar. In the current paper, the heat loads in new engine have been discussed. It has been shown that thermal equilibrium of the thruster is gained within the safety limits of the materials used. Extensive testing with both gases was performed to compare KLIMT’s thermal behaviour when supplied with krypton and xenon propellants.
Źródło:
Nukleonika; 2017, 62, 1; 9-15
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic analyses of ships shafts lines
Autorzy:
Grządziela, A.
Powiązania:
https://bibliotekanauki.pl/articles/241759.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
ship propulsions
dynamic analyse
propulsion system
Simulink software
Opis:
Ships' propulsion plant usually works in a hard environment caused by static forces and permanent dynamic loads. Exciding of tolerated values of shaft alignments causes a damage of radial and thrust bearings in relative short time. Modelling of dynamical reactions could bring information to the designer for recognizing the level of hazard for propulsion system. Knowledge of a character of dynamic loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. This way elimination of costly and time-consuming overhauls on dock leads to lowering operational costs and increasing ship fighting merits. A paper presents a proposal of identification of a degree of hazard to ship shaft line due to forces of shafts misalignment. A theoretical analysis was made of influence of changes in co - axiality of shafts resulting from elastic deformations of hull structure in vicinity of shaft bearing foundations. The main problem of naval vessels is a lack of dynamical requirements of stiffness of the hull. Modelled signals were recognized within sensitive symptoms of two sub models: model of propulsion system and model of shaft's misalignment. Both sub models allow testing forces and their responses in vibration spectrum using SIMULINK software.
Źródło:
Journal of KONES; 2008, 15, 4; 163-170
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An influence of pusher propeller cover on its performance : a concept of wind tunnel investigation
Autorzy:
Ruchała, P.
Powiązania:
https://bibliotekanauki.pl/articles/242105.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aircraft engineering
air propulsion
pusher propeller
wind tunnel tests
Opis:
The paper describes a concept of wind tunnel investigation of the influence of the pusher propeller cover on its performance. The pusher propeller is one of the most popular types of the airplane propulsion, especially in light sport aircrafts and in the UAVs (Unmanned Aerial Vehicles). Its main advantages is that the engine with the pusher propeller does not affect the visibility from the cockpit and allows for placing an electronic equipment (for example, a camera) in the front part of the UAV’s fuselage. One of main disadvantages of pusher propeller is that it is partially covered by the fuselage and the wings of the airplane, thus the slipstream is distorted. This distortion may reduce the propeller thrust and efficiency. It may also cause vibrations of the propeller blades. This fact is well known, however it is difficult to find any quantitative information about reduction of the propeller performance. Taking it into account, it is worth to treat this subject and show a way to enhance the propeller performance. The wind tunnel tests, which concept has been described in the paper, will include measurements of total aerodynamic loads acting on the investigated object and on the propeller. Measurement of velocity distribution in the slipstream (by pressure measurement and by laser anemometry) will be included as well.
Źródło:
Journal of KONES; 2016, 23, 4; 429-434
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of propulsion unit for a new class of transport hovercraft as a compromise between technical performance and purchase and exploitation costs
Autorzy:
Szafran, K.
Pągowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/242701.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
exploitation costs
propulsion unit
operational safety
production economics
Opis:
In this paper, the authors presented some technical and economic relations to which a team designing a new means of transport should pay attention. In the first chapter briefly describes the hovercraft designed and built at the Institute of Aviation, as well as showing the certification documents obtained in the process of certification by the Polish Register of Shipping and Inland Navigation Office. The second chapter shows some parts of the production process. In the third chapter shows the drive unit and the characteristics of the selected motor. Problems of selecting a drive unit for a newly designed hovercraft aimed at transporting people and goods were described. The choice of propulsion engine, its quality and the kind of fuel affect the cost of purchase as well as the time and exploitation costs. A user planning a transport network pays particular attention to minimizing operating costs and the consequent reliability and safety. The authors presented regulations and standards, which need to be met by the transport unit designed for use in the public area. Attention was also paid to ecology, noise and pollution. An algorithm, which takes into account the rules of conduct, requirements of the ordering party and conditions of the manufacturer, was proposed. In conclusion, the generalized technical and economic guidelines are proposed which, in the authors’ opinion, may aid the development of a conceptual design of new modes of transport – not only the hovercraft.
Źródło:
Journal of KONES; 2016, 23, 3; 519-524
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dry friction damper for supercritical drive shaft
Autorzy:
Perkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/244094.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
supercritical drive shaft
supercritical propulsion shaft
dry friction damper
Opis:
In this article the construction and mathematical model of a dry friction damper with radial gap, designed for dumping flexural vibrations of a supercritical propulsion shaft (developed previously during design works made in Institute of Aviation on propulsion system for an ultralight IS-2 helicopter), while passing through the resonance is presented. Some results of mathematical and numerical analyses of such a system (supercritical shaft + damper) behaviour are also presented – among other things, very distinctive behaviour of the shaft, while passing through resonance, is shown. From a theoretical point of view, it is interesting that certain range of damper parameters, obtained in the course of numerical analysis, lead to chaotic vibrations of the system (they were also observed in practice). From a practical point of view, it will be interesting that the article shows a way how to create a dimensionless (and therefore general) parameters of the system: supercritical shaft and friction damper and also simple engineering methodology for selection of suitable (for the correct operation of the shaft) damper parameters depending on the parameters of the shaft, developed during series of analyses. The practical aspect of the problem seems to be particularly important, as the supercritical propulsion shaft equipped with a friction damper can be very structurally simple, light and inexpensive, and still it is not widely used, probably because of certain doubts aroused in the constructors by the term: “resonant vibrations”.
Źródło:
Journal of KONES; 2016, 23, 4; 389-396
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigations of the engine cooling system in a small power vessel pod propulsion system
Autorzy:
Dymarski, C.
Leśniewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/258590.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
azimuthing electric propulsion
pod propeller
heat transfer
cooling system
Opis:
The development of electronics and electrotechnology enabled to put electric motors of the alternating current in the pod and to use them for the main drive of ships. A lot of heat which must be picked up from the system is a problem which is turning up at applying the system of this type. Many big ships lately contended with these problems. Building the small propeller for the boat powered with solar power we decided to check the influence of the chilling middle on the temperature of the work of an engine. In the article we are presenting a built propeller and a way, into which an issue of the exchange of the heat was analysed using the Fluent software.
Źródło:
Polish Maritime Research; 2008, 4; 59-65
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of the ahp method in ship system risk estimation
Autorzy:
Nguyen, H.
Powiązania:
https://bibliotekanauki.pl/articles/258664.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
AHP method
estimation
propulsion risk
expert courts
ship systems
Opis:
The article presents procedures of application of the AHP method for estimating risks of ship systems. The estimation of system risk function parameters is done based on the data obtained from experts and processed using the pairwise comparative method.
Źródło:
Polish Maritime Research; 2009, 1; 78-82
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of gas turbine controller adjustment on ship propulsion system behavior in rough sea conditions. Part 2. The simulation investigations
Autorzy:
Dzida, M.
Powiązania:
https://bibliotekanauki.pl/articles/259451.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion system
gas turbines
automatic control
sea waving
Opis:
The paper presents simulation investigations of influence of gas turbine controller adjuŹstment on ship propulsion system operating in heavy sea conditions, based on the model presented in Part 1 of the paper. The ship propulsion system with two gas turbines driŹving - through mechanical gear - ship controllable pitch propeller, described in Part 1, was used to analysis. The harmonic disturbances due to sea waves with selected frequencies were used as input function in computing the system’s amplitude characteristics at different settings of P and PD controllers.
Źródło:
Polish Maritime Research; 2004, 1; 15-23
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficient small inland passenger shuttle ferry with hybrid propulsion - concept design, calculations and model tests
Autorzy:
Kunicka, Magdalena
Litwin, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/259786.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship hybrid propulsion
energy efficiency
green shipping
energy management
Opis:
In recent years, there has been a significant development in “green” and energy efficient propulsion systems, which fits into the general trend of environmentally friendly “green shipping”. The pursued goal is to construct a safe passenger ship that is low in energy demand and equipped with a highly energy efficient, emission-free propulsion system. The paper presents main problems encountered by designers of a small, hybrid-powered ferry powered lithium batteries. The conducted research allowed to create a design of an energy efficient hull shape, which decreases the demand for energy. Completed remote control model tests resulted in a proposal of an energy efficient and safe propulsion system with good manoeuvring capabilities. Measurements completed on an existing ferry permitted completing energy balance and forming an energy management policy. The paper contains the emission calculations computed for the existing ferry that are necessary for the environmental impact analysis. The soon to be constructed, newly designed vessel will provide a valuable contribution to hybrid-propulsion, energy management and unmanned technologies research.
Źródło:
Polish Maritime Research; 2019, 2; 85-92
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for selection of parameters of ship propulsion system fitted with compromise screw propeller
Autorzy:
Michalski, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/260378.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
design of inland waterways ships
ship propellers
ship propulsion
Opis:
This paper concerns an algorithmic method for preliminary selection of parameters of ship propulsion system fitted with fixed screw propeller in the case when the ship’s operation is associated with significant changes of waterway depth and width, hull resistance of the ship and its service speed. Mathematical model arguments of the considered design problem are main ship design parameters identified in the preliminary design stage. Structure of the formulated model complies with formal requirements for continuous- discrete mathematical optimization problems. The presented examples of application of the method concern an inland waterways ship fitted with compromise screw propeller optimized in the sense of minimization of fuel consumption for passing a given route distance within a given time. The elaborated method may be especially useful in designing such ships as : coasters, inland waterways ships, tugs, pushers, trawlers, mine sweepers, icebreakers etc.
Źródło:
Polish Maritime Research; 2007, 4; 3-9
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza możliwości rekuperacji elektrycznego pojazdu komunikacji miejskiej
Autorzy:
Biernacki, Marcin
Majewski, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/2091723.pdf
Data publikacji:
2022
Wydawca:
Wydawnictwo Druk-Art
Tematy:
autobus elektryczny
napęd elektryczny
rekuperacja
electrical bus
electrical propulsion
Opis:
W pracy przedstawiono wybrane sposoby odzyskiwania oraz magazynowania energii wytworzonej podczas hamowania pojazdu użytkowanego na potrzeby transportu publicznego na terenach miejskich. Omówiono podstawowe fazy pracy elektromechanicznego układu napędowego autobusu poruszającego się jedną z wybranych tras komunikacyjnych w dużej aglomeracji miejskiej, gdzie wybrana trasa została przyjęta jako trasa testowa. Omówiono współpracę układu napędowego z pojedynczym oraz z dwoma zasobnikami (magazynami) energii o parametrach dobranych do wariantów przejazdu trasą testową. Przeanalizowano ilość odzyskiwanej energii w stosunku do ilości energii niezbędnej do przebycia wybranej trasy, a ponadto zwrócono uwagę na trwałość głównego i pomocniczego źródła zasilania, które jednocześnie służą do odbioru i magazynowania energii odzyskanej podczas hamowania. Omówiono wybrane warunki opłacalności odzyskiwania energii.
The document describes selected methods of recovering and storing energy generated during breaking a vehicle (bus) intended for collective passenger transport in urban areas. Basic operate phases of electromechnical propulsion system of bus was described where to take in to account real communication route as a testing route. The work of the electromechanical drive system with single and with two cooperating energy storage (storages) units was analyzed. A propulsion system powered from a source or sources of energy with different capacities provided for the test route variants, that are the equivalent of one of the real routes served by public transport plants, was tested. The amount of recovered energy was analyzed in relation to the amount of energy necessary to travel the selected route. The durability of the main and cooperated auxiliary power source, operated as the storage of energy recovered during vehicle braking, was analyzed. Selected profitability conditions for energy recovery were analyzed.
Źródło:
Napędy i Sterowanie; 2022, 24, 1; 44--49
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cavitating Venturi as a Mass Flow Controller in a Deep Throttling Liquid Rocket Engine
Autorzy:
Sekrecki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/36825330.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
cavitating venturi
throttling
regulatory valve
HTP
ethanol
green propulsion
Opis:
The most common solutions for rocket engines are the single operation point (thrust level) units. Oxidiser and fuel mass flow rates and the oxidiser-to-fuel mass flow rate ratio (OFR) are some of the determinants of the thrust level. Based on these, planetary ascent and descent; space rendezvous; orbital manoeuvring, including orientation and stabilisation in space; hovering, hazard avoidance during planetary landing; and ballistic missile trajectory control propulsion systems could use throttleable liquid engines. Several engine throttling methods, such as supply pressure variation and variable injector area, can be applied. Among others, a cavitating venturi propellant regulatory valve is one of the most promising throttling method. This type of valve can provide steady mass flow, despite the downstream pressure disturbance (i.e. from the combustion chamber), which sustains a stable engine thrust as the mass flow is kept. The article presents the valve sizing method, design and prototype test results of the cavitating venturi valve that has potential for utilisation in a deep throttling rocket engine. Mass flow stability and repeatability are presented for valve operating points in the 10%-110% nominal mass flow range. Valve design optimisation, based on CFD, to sustain cavitation for a higher downstream-to-upstream pressure ratio is shown.
Źródło:
Transactions on Aerospace Research; 2023, 3 (272); 72-86
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Reliability Block Diagrams and Fault Tree circuits, to develop a Condition Based Maintenance Model for a Vessel’s Main Propulsion System and Related Subsystems
Autorzy:
Anantharaman, M.
Powiązania:
https://bibliotekanauki.pl/articles/117168.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Fault Tree
Main Engine
Propulsion System
Condition Based Maintenance (CBM)
Planned Maintenance System
Reliability Block Diagrams
Main Propulsion
fault tree analysis (FTA)
Opis:
Merchant shipping has undergone a great transformation over the past three decades. The shipping market is highly competitive, which coupled with high crewing and fuel costs, leads to high operational costs. One of the paramount factor involved in vessel operation is the Maintenance cost and there is a dire need to keep this cost to a minimum. Fortunately the earlier policy of repair only maintenance in commercial shipping has been done away with, and was replaced by the policy of preventive maintenance. Planned Maintenance System was introduced by ship management companies in the early 90’s. Planned Maintenance offered benefits over the repair only policy, but has its own demerits. Many a time machinery equipment is opened up for routine maintenance after a specified time interval, irrespective of the need. This could lead to potential failures, which is explained by the fact that preventive maintenance resulted in meddling of a well set piece of machinery equipment, leading to its subsequent failure. This is where Condition based maintenance or CBM steps into prominence. CBM monitors the health of the machinery equipment, analyses the condition and helps you in decision making. The Main Propulsion system forms the heart of a vessel and we need to ensure its reliability, together with the reliability of its associated sub-systems. The entire system can be represented by reliability block diagrams, to show the interdependence of various components comprising the system. This helps in the decision making process of CBM whereby ship’s engineer may decide to stop the running machinery equipment, open and overhaul the same, else postpone the overhaul for a later safe date.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 3; 409-413
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability evaluation of electrochemical energy storage systems supplying the ships main propulsion system
Autorzy:
Szewczyk, P.
Łebkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/24201455.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
reliability assessment
electric propulsion system
energy storage systems
electric ship
reliability block diagram
probability of failure occurrence
hybrid electric-propulsion system
Opis:
The paper presents the structure of hybrid and electric modern ship propulsion systems. Types and configuration of electrochemical cells for selected electric energy storage facilities on the ship were presented. The method and results of reliability analyses, such as failure mode effect analysis (FMEA), reliability block diagram (RBD) and fault tree analysis (FTA), used to estimate the probability of failure of the energy storage systems supplying the ship's main propulsion, are presented. Methods of evaluation and verification of the proposed reliability model using a laboratory model and available operational and service data are discussed. A proposal for a quantitative risk analysis of potential damage during the operation of the energy storage has been presented.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 87--94
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł

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