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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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
Two design concepts of power plant for an inland waterways passenger ship intended for operating on BERLIN – KALININGRAD route
Autorzy:
Bocheński, D.
Rudnicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/260447.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland waterways passenger ship
ship power plant
ship propulsion systems
Opis:
This paper presents two most probable design solutions of power plant for a two-segment passenger ship intended for operating on inland waterways of Poland, Germany and Russia. Preliminary designs of the main power plant to be installed on the pusher are presented, as well as requirements for the auxiliary power plant to be placed on the barge are outlined.
Źródło:
Polish Maritime Research; 2006, S 2; 52-56
1233-2585
Pojawia się w:
Polish Maritime Research
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:
Economical analysis of selected variants of power plant for inland waterways passenger ship intended for operating on Berlin - Kaliningrad route
Autorzy:
Bocheński, D.
Powiązania:
https://bibliotekanauki.pl/articles/260439.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland waterways passenger ship
ship power plant
ship propulsion systems
Opis:
This paper contains an economical analysis of three selected variants of power plant for inland waterways passenger ship intended for operating on Berlin-Kaliningrad route. Purchase cost of elements of the ship’s energy system and fuel consumption cost were assumed as the assessment criterion for the analyzed variants of the ship’s power plant. The economical indices : Average Annual Cost (AAC) and Net Present Value (NPV) were taken into consideration.
Źródło:
Polish Maritime Research; 2006, S 2; 47-51
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:
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:
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:
Assisted propulsion device of a semi-submersible ship based on the magnus effect
Autorzy:
Lv, Jingze
Lin, Yiqun
Zhang, Rui
Li, Boyang
Hualin, Yang
Powiązania:
https://bibliotekanauki.pl/articles/32909218.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Flettner rotor
semi-submersible ship
wind energy
ship propulsion
numerical simulation
Opis:
The purpose of this study is to explore the potentiality of wind propulsion on semi-submersible ships. A new type of Flettner rotor (two rotating cylinders) system installed on a semi-submersible ship is proposed. The structure and installation of two cylinders with a height of 20 m and a diameter of 14 m are introduced. The numerical simulation of the cylinder is carried out in Fluent software. The influence of apparent wind angle and spin ratio on the two cylinders are analysed, when the distance between two cylinders is 3D-13D (D is cylinder diameter). When the distance between two cylinders is 3D, the performance of the system increases with an increase in spin ratio. Moreover, the apparent wind angle also has an effect on the system performance. Specifically, the thrust contribution of the system at the apparent wind angle of 120° is the largest at the spin ratio of 3.0. The maximum thrust reaches 500 kN. When the spin ratio is 2.5 and the apparent wind angle is 120°, the maximum effective power of the system is 1734 kW. In addition, the influence of the two cylinders distance on system performance cannot be ignored. When the distance between the two cylinders is 7D and the spin ratio is 2.5, the effective power of the system reaches a maximum, which is 1932 kW.
Źródło:
Polish Maritime Research; 2022, 3; 33-46
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of propeller emergence on hull, propeller, engine, and fuel consumption performance in regular head waves
Autorzy:
Ghaemi, Mohammad Hossein
Zeraatgar, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/32898210.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship dynamics
ship propulsion system
propeller ventilation
propeller emergence
sea waves
Opis:
In this study, the impact of propeller emergence on the performance of a ship (speed), propeller (thrust, torque, and RPM), a diesel engine (torque and RPM) and fuel consumption are analysed under severe sea conditions. The goal is to describe the variation in the system variables and fuel consumption rather than analysing the motion of the ship or the phenomenon of propeller ventilation in itself. A mathematical model of the hull, propeller, and engine interactions is developed in which the propeller emergence is included. The system parameters are set using model experiments, empirical formulae, and available data for the engine. The dynamic response of the system is examined in regular head waves under submerged and emerged conditions of the propeller. The pulsatility and the extent of variation of 20 selected variables for the coupled system of hull, propeller, and engine are elaborated using quantitative and qualitative terms and absolute and relative scales. The simulation begins with a ship moving on a straight path, in calm water, with a constant speed for the ship, propeller and engine under steady conditions. The ship then encounters regular head waves with a known time series of the total resistance of the ship in waves. Large motions of the ship create propeller emergence, which in turn reduces the propeller thrust and torque. This study shows that for a specific ship, the mean ship speed, shaft angular velocity, and engine power were slightly reduced in submerged conditions with respect to calm water. We compared the mean values of the variables to those in the emerged condition, and found that the shaft angular velocity was almost the same, the ship speed was considerably reduced, and the engine power significantly dropped with respect to calm water. The ratios of the amplitude of fluctuation to the mean (Amp/Mean) for the ship speed and angular velocity of the shaft under both conditions were considerable, while the Amp/Mean for the power delivered by the engine was extremely high. The outcomes of the study show the degree of influence of propeller emergence on these variables. We identify the extent of each change and categorise the variables into three main groups based on the results.
Źródło:
Polish Maritime Research; 2022, 4; 56-76
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of a new type of Flettner rotor in merchant ships
Autorzy:
Li, Boyang
Zhang, Rui
Li, Yajing
Zhang, Baoshou
Guo, Chao
Powiązania:
https://bibliotekanauki.pl/articles/1573694.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
flettner rotor
wind energy
rotating cylinder
numerical simulation
Opis:
Wind energy is a clean and renewable source of energy. This study seeks to explore the potential for utilising wind power for merchant ships. A new type of Flettner rotor (rotating cylinder) mounted on the superstructure of a ship is proposed and numerically simulated. The construction and installation of the rotating cylinder is designed and a numerical simulation of the ship-mounted cylinder is carried out, using the commercially available CFD code Ansys Fluent to obtain parameters such as lift and drag coefficient of the cylinder in different conditions. Specifically, it is found that the cylinder type superstructure can play a certain role in reducing the effect of friction by comparing traditional and cylindrical superstructures; the rotating cylinder can generate auxiliary thrust for the ship. After analysis, the wind speed around the cylinder and spin ratio will have a direct influence on its thrust effect; there is an inflection point in the lift coefficient with the increase of α; the thrust coefficient (8.63) reaches the maximum environmental wind speed at 10 m/s and spin ratio is 2.5. For the rotating cylinder, the greater the environmental wind, the greater the thrust contribution generated under the same spin ratio conditions. The maximum thrust can reach 750,000 N; the cylinder’s auxiliary propulsion contribution shows a better advantage in α = 2.0. The effective power generated by the cylinder reaches a maximum of 2,240 kW for environmental wind speed = 20 m/s and α = 1.0.
Źródło:
Polish Maritime Research; 2021, 1; 28-41
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis of the effectiveness of ship propulsion devices
Autorzy:
Abramowicz-Gerik, T.
Powiązania:
https://bibliotekanauki.pl/articles/320536.pdf
Data publikacji:
2008
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
napędy okrętowe
modelowanie
siły hydrodynamiczne
ship propulsion
modelling
hydrodynamic forces
Opis:
The paper presents the study on the effectiveness of ship propulsion devices based on model tests conducted in the open water experimental set up. The influence of the water depth to draft ratio and distance from the vertical tight wall on the hydrodynamic forces generated by the propellers on the ship hull was investigated. The interaction effects observed for the twin propeller ship in bollard pull condition were compared with the effects induced by single propeller vessels available in literature and discussed with respect to the mathematical modelling of hydrodynamic forces generated on the hull by ship propulsion devices.
Źródło:
Annual of Navigation; 2008, 13; 5-13
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sighting through as part of shaft alignment procedure
Wyznaczanie linii odniesienia jako element procedury osiowania wałów
Autorzy:
Jarysz-Kamińska, E.
Powiązania:
https://bibliotekanauki.pl/articles/327712.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
wał
współosiowość
okrętowy układ napędowy
shaft
alignment
ship propulsion system
Opis:
This paper presents chosen activities of the ships propulsion system shafting alignment procedure. The main focus in this paper was put on sighting through (bore sighting) which can be done with three different types of measurement equipment: piano were, optical instruments and laser instruments. The analysis of measurement equipment allows selection of most optimal measurement solution for company. The matter of this selection is to avoid hazard to the shaft line due to shafts misalignment. Presented in paper measuring techniques and measurement equipment which is being used for sighting trough the elements of ships propulsion system meet technological requirements requested by the client and by the ship classification society.
W artykule przedstawiono zagadnienie procedury osiowania układu napędowego statku. Skoncentrowano się na ustawianiu bezpośrednim z wykorzystaniem trzech różnych przyrządów pomiarowych. Do pomiarów wykorzystano strunę stalową, urządzanie optyczne i urządzenie laserowe. Przedstawienie trzech różnych grup przyrządów pozwala na wybór najbardziej optymalnego rozwiązania dla przedsiębiorstwa. Istotą tego doboru jest uniknięcie zagrożenia dla linii wałów wynikającą z przekroczenia parametrów współosiowości. Omawiane techniki i przyrządy pomiarowe służące do bezpośredniego ustawiania elementów okrętowego układu napędowego spełniają wymagania technologiczne stawiane zarówno przez klienta jak i towarzystwa klasyfikacyjne.
Źródło:
Diagnostyka; 2010, 4(56); 65-68
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability, availability, and maintainability analysis of the propulsion system of a fleet
Autorzy:
Bayraktar, Murat
Nuran, Mustafa
Powiązania:
https://bibliotekanauki.pl/articles/24202522.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship propulsion system
reliability
availability
maintainability
RWB software
RAM analysis
Opis:
New systems are produced and developed to meet specific needs, and their reliability is the most important issue. In the maritime industry, evaluating failures in a ship’s propulsion system results in high costs and the loss of prestige for the company. Land/sea fleet employees need to detect and minimize the failures that may occur in ship propulsion systems in advance to ensure the continuity of the ships’ operations. In this study, the recorded failure data of four different ships belonging to a fleet in the last 10 years are used. Failures were examined as a whole since the ships have similar propulsion systems. The obtained failure data were grouped, and the average time to fix the failures was determined by the chief engineer and made suitable for reliability, availability, and maintainability (RAM) analysis. A suitable model was created for grouped failures by Isograph’s RWB software. As a result of the analysis of the propulsion system and its subsystems, the main engine of the ship was shown to have the best reliability. Furthermore, the most important components were the cylinders of the main engine as subsystems. This study highlights the components that are important to the reliability of a propulsion system. Thanks to the RAM analysis, improvements can be pinpointed on a ship’s propulsion system, which will increase the operations of the maritime industry. Reducing failures will further increase the confidence in maritime transport and strengthen its place among the modes of transportation. This study provides a valuable resource for academicians, experts, as well as companies working on reliability, availability, and maintainability in the future.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 70 (142); 63--70
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
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