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Wyświetlanie 1-15 z 92
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:
Prospective alternative propulsion systems for unmanned aerial vehicles
Autorzy:
Orkisz, M
Wołoszyn, T.
Wygonik, P
Powiązania:
https://bibliotekanauki.pl/articles/949507.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
alternative energy sources
hybrid-electric propulsion systems
fuel cells
solar cells
unmanned aerial
vehicles
Opis:
The paper presents selected issues concerning alternative power sources and propulsion systems meant for unmanned aerial vehicles (UAVs). The implementation of new propulsions in aviation is a laborious and long-term process, mostly due to safety and economical restrictions and requirements. Broadly, exploited solutions known from automotive industry may serve as a basis for development in aerospace technology, but cannot be applied without considering specific technical aspects (related to aircraft technology and flying objects physics). These aspects are mentioned in the text and some issues concerning suitability of types of aircraft are described. The paper presented contains a review of research on non-conventional propulsion systems for UAVs, conducted in Rzeszow University of Technology. Selected results of the research the fuel cell and the solar-cell UAVs and the aerial hybrid-electric drive test stand are shown in adequate pictures. The small-unmanned flying objects seem to be an accurate basis for such research. They allow reducing costs and improving safety in comparison to full-scale manned aircraft. They are also much quicker in manufacturing and easier to maintain and repair. Moreover, due to their various applications they may comprise the target market for this kind of propulsions. In particular, the issues of parallel hybrid-electric propulsions, fuel cell and solar-cell-assisted systems with appropriate examples are mentioned in the paper..
Źródło:
Journal of KONES; 2014, 21, 4; 369-374
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Torsional vibration silencers used in vessels propulsion systems
Autorzy:
Homik, W.
Powiązania:
https://bibliotekanauki.pl/articles/359576.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
crankshaft vibration
longitudinal vibration
torsional vibration of crankshaft
torsional vibration damping
Opis:
The main source of vibration in the engine piston is the work of the piston – crank, and swapping reciprocating motion to the rotary motion. In this paper are described among others the crankshaft vibration which result in the occurrence of cyclic forces such as forces pressure of gas and inertia forces. In addition were made the analysis of longitudinal vibration of the crankshaft, which are these vibrations are an important problem in high-power vessels’ engines. Regardless of the dynamic system in which the engine is running the greatest threat for crankshaft are the torsional vibrations. The possibilities of vibration damping of the crankshaft in the engine also were discussed.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 40 (112); 9-16
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistance of idle propellers in marine multi-propeller propulsion systems
Autorzy:
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/247530.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
high speed vessels
marine propellers
multi-propeller propulsion systems
Opis:
The configuration of a marine propulsion system is selected with regard to the maximum power resulting from its maximum design speed and displacement. The propulsion systems of high speed vessels use three or even four propellers, and each propulsion unit may be multi-engine. High speed vessels are designedfor maximum speeds, but their factual exploitation speed parameters are usually considerably lower - partial speed. In such cases particular propulsion propellers and engines need to be shut down. The idle propellers are dragged by the hull and they work in the so-called turbine work mode; they transfer torque to the shaft and generale negative thrust, i.e. additional resistance. Additional resistance contributes to reducing estimated speed of a vessel and increasing fuel consumption. What is more, torque generated on a propeller is transferred to the shaft and when friction resistance torque in shaft stuffing-boxes and bearings, transmission and, possibly, the propulsion engine is exceeded, mobile components rotate as a result, reaching considerable rotational speed values. torque and thrust on a propeller in this work mode may be estimated on the grounds of universal hydrodynamic characteristics of propellers. Universal hydrodynamic characteristics of propellers are used as reversion characteristics in evaluating the steering properties ofa vessel, and may be useful in evaluating resistance of free wheeling and locked propellers in marine multi-shaft propulsion systems. This paper presents charts of universal hydrodynamic characteristics of propellers for the full range of their rotational speed, the methodology and an example of calculating resistance of free wheeling and locked propellers for the given marine propulsion system.
Źródło:
Journal of KONES; 2010, 17, 4; 97-102
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A testing method of propulsion systems on simile micro models
Autorzy:
Coman, A.
Vasile, T.
Barbu, C.
Powiązania:
https://bibliotekanauki.pl/articles/235921.pdf
Data publikacji:
2005
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
silniki rakietowe
urządzenia napędowe
rocket engines
Opis:
In this paper is presented a testing method of propulsion systems on simile micro models. In order to calculate and design a micro engine simile with a real rocket engine, physical and geometrical relations where deduced. On the base of experimental data measured after testing of simile micro engine, can be establish the ballistic parameters of real rocket engine.
Źródło:
Problemy Techniki Uzbrojenia; 2005, R. 34, z. 94; 21-29
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza zintegrowanych układów napędowych
Comparative Analysis of Integrated Propulsion Systems
Autorzy:
Giernalczyk, M.
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/360670.pdf
Data publikacji:
2005
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
integrowany układ napędowy
OMiUO 2005
Propac
Alpha
Propac system
Alpha system
integrated propulsion packages
Opis:
W artykule przedstawiono porównanie zintegrowanych układów napędowych dwóch firm MAN B&W oraz Wärtsilä-Sulzer. Omówiono zalety i wady tych układów. Wskazano na problemy eksploatacyjne. Zamieszczono rysunki prezentowanych układów.
Two integrated propulsion systems manufactured by MAN B&W and Wärtsilä, respectively, are compared. The advantages and disadvantages of these systems are discussed. Some operational problems are indicated. The presented systems are illustrated.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 5 (77); 237-246
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania sprawności złożonych układów napędowych
Efficiency examination of complex propulsion systems
Autorzy:
Sadowski, A.
Żółtowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/2071778.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sprawność
układ napędowy
straty energii
efficiency
transmission
energy losses
Opis:
W pracy zaprezentowano metody wyznaczania sprawności oraz zestawienie strat energii w procesie jej przekazywania w układzie napędowym maszyn. Energia przepływająca przez układ napędowy zostaje pomniejszona w wyniku strat związanych ze sprawnością jego podzespołów. O sprawności układu decydują zarówno sprawności poszczególnych mechanizmów składowych jak i sposób ich połączenia. Ponadto przedstawiono aparaturę pomiarową do bezdemontażowych badań sprawności.
Methods for the efficiency determination and a list of energy losses in the process of its transmission in propulsion machinery are presented in the paper. Energy flowing through the transmission system is reduced as a result of losses occurring in its sub-assemblies. The system efficiency depends not only on efficiency of different mechanisms but also on methods of their connections. In addition, measurement devices used for dismantling efficiency tests are shown.
Źródło:
Inżynieria i Aparatura Chemiczna; 2012, 5; 249-250
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Full-electric, hybrid and turbo-electric technologies for future aircraft propulsion systems
Autorzy:
Łukasik, B.
Wiśniowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/243487.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
full electric
turbo-electric
hybrid systems
distributed propulsion systems
Opis:
Recently a huge progress in the field of electrical machines makes them more available for aviation. Assuming a big leap forward of electric technology in the near future, many research institutes around the World examine a revolutionary propulsion system which employs electrical machines. This idea can be a perfect response to a drastically growing air traffic and its demands about emission and fuel consumption reduction. There are already manufactured full electric, ultralight airplanes, which show that the technology is promising and future-proof. What is more it seems to be a key enabler for the development of the other technology that will influence the future of aircraft design and will allow introducing completely new airplane architectures. That is why Institute of Aviation in collaboration with The Ohio State University conducts investigation and analysis on feasibility of using such systems for aircraft propulsion. For this task a completely new tool based on Numerical Propulsion System Simulation (NPSS) environment is being developed. It will enable to analyse the electric devices conjugated with turbine engine as a whole propulsion system in the matter of its performance characteristics. The purpose of this paper is to present some of the most promising ideas and already accomplished analysis of different kinds of architectures. The analysis and optimization of the system, as well as cost effectiveness will be presented.
Źródło:
Journal of KONES; 2016, 23, 4; 305-310
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
Problems of propulsion systems and main engines choice for offshore support vessels
Autorzy:
Herdzik, J.
Powiązania:
https://bibliotekanauki.pl/articles/360779.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
offshore support vessel
propulsion system
power plant configuration
main engines choice
Opis:
It was presented the problems of configuration choice of the power system and the propulsion system for offshore support vessels during the design process. It becomes more complicated when the vessel ought to have the dynamic positioning system. Due to long term engine work on low loads (idling) during station keeping process or dynamic positioning process and possible quick and heavy changes of power demand for the industry part there is an important problem for the correct choice of the components of power system configuration. There are possible three types of propulsion: Diesel mechanical (DM), Diesel electrical (DE) and hybrid (HP). The choice has an influence on many parameters: the specific fuel consumption, the propulsion and total efficiency, the costs of vessel’s operation. Some of those problems were presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 2; 37-44
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration diagnostics of the naval propulsion systems
Diagnostyka drganiowa okrętowych układów napędowych
Autorzy:
Kluczyk, M.
Grządziela, A.
Powiązania:
https://bibliotekanauki.pl/articles/222773.pdf
Data publikacji:
2017
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
propulsion system
shaft lines
vibrations
warships
układ napędowy
linie wałów
drgania
okręty
Opis:
The paper presents examples of vibration performances of the naval propulsion systems. It describes the methodology of preparation for measurement, used gauges and their restrictions. The necessity of synchronous measurements had been justified. The work contains also samples of analysis, to facilitate the reader with the components of amplitude-frequency spectra of naval propulsion systems. An overview of the existing normative documents had been presented. At the same time limitations of applying of them during technical monitoring of marine propulsion systems had been presented.
W artykule przedstawiono przykłady diagnostycznych pomiarów parametrów drganiowych okrętowych linii wałów. Opisano metodologię przygotowania do pomiarów, stosowanie urządzeń pomiarowych oraz ich ograniczenia. Uzasadniono konieczność stosowania pomiarów synchronicznych. Przedstawiono przegląd obowiązujących dokumentów normatywnych, zwracając jednocześnie uwagę na ich ograniczenia w procesie monitorowania stanu technicznego okrętowych układów napędowych.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2017, R. 58 nr 1 (208), 1 (208); 15-29
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring system of extreme loadings of propulsion system’s foundation : design assumptions
Autorzy:
Kyzioł, L.
Murawski, L.
Powiązania:
https://bibliotekanauki.pl/articles/242588.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine structural health monitoring
propulsion system diagnostic
marine engines’ foundations
underwater explosion
ship grounding
optical time-domain reflectometer
Fibre Bragg Grating
Opis:
Project of on-line diagnostic (monitoring) system of marine propulsion system working parameters is the authors' general target. Proper propulsion system’s foundation is one of the most important parameters for its reliable operation. Different types of quasi-static loadings and dynamic excitations can be observed during ships exploitation. Presented research has been limited to extreme loadings. Underwater explosions or ship groundings are considered examples of extreme foundation loadings. Analysis of the physical parameters of the extreme forces has been presented in the first part of the paper. Water pressure spatial and non-spatial (time) distribution during underwater explosion has been analysed as an example. Short overview of the dynamic mathematical models of underwater explosions is presented. Time function of vibrations acceleration of ship construction is important design assumption of planned Structural Health Monitoring (SHM) system. Propulsion system's foundation loading measurements should take into account general ship hull deformation (in the aft part of the ship) as well as reactions changes of main engine and shaft line bearings. Ship hull deformation should be monitored as quasi-continuous measurements, along whole propulsion system. Optical Time-Domain Reflectometer method (OTDR) is planned for hull deformation monitoring. Propulsion system bearings' reactions are a source of local foundation pads' strain changes. Fibre Bragg Grating (FBG) sensors are the best for that kind of measurements, in authors opinion. Both techniques (OTDR and FBG) have been shortly described in the paper. Scheme of monitoring system of marine propulsion systems foundation's loadings are proposed in the end of the article.
Źródło:
Journal of KONES; 2013, 20, 1; 155-162
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 92

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