Wyniki wyszukiwania - Biblioteka Nauki

1

Selected issues of hybrid outboard motors

100%

Lesniewski W.

Polish Maritime Research

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2019

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tom 26

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nr 4

EN

The aim of the research reported in the article was designing a hybrid drive system based on an outboard internal combustion engine offered by a selected producer and testing its operating characteristics. The article presents different designs of this type of drive which can be found in the literature and are available in the market. The designed hybrid outboard drive system was tested both on the laboratory test rig and in real operating conditions. The results of these tests are included

2

THE DIFFICULT BEGINNING OF SPECIAL RELATIONS BETWEEN GREAT BRITAIN AND THE USA, 1945-1948

100%

Lesniewski W.

Dzieje Najnowsze

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2007

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nr 4

115-126

EN

The opinion about the special relations between United Kingdom and the US has become so firmly established that the rough path leading towards their emergence is often simply forgotten. The tendency to derive the relation in question from a linguistic or cultural community simplifies the complex issue. The same holds true for the view that their origin was an unavoidable consequence of cooperation dating back to the Second World War. On the other hand, it is true that during the war and after its end the number of essential differences between the two states was considerable: the attitude towards American aid within the lend-lease programme during the last stage of the war, the attitude towards British colonial rule in the world, Jewish settlements in Palestine and the fate of Palestine after the British mandate ended, etc. At the same time, both sides of Atlantic witnessed the appearance of a conviction about the need to cooperate in blocking the expansion of the Soviet Union and the communist system in Europe and other parts of the world. Joint interests, together with other factors such as British fear of an American return to isolationism, and in the USA - a readiness to exploit heretofore-British influence all over the world, became the reason why the end of the 1940s was marked by a rise of a special partnership involving the two states, rendered even more exceptional by a linguistic and cultural community.

3

Numerical investigations of the engine cooling system ina small power vessel pod propulsion system

63%

Dymarski C. , Lesniewski W.

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tom 15

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nr 4

EN

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

4

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

51%

Kowalski J. , Lesniewski W. , Litwin W.

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nr 3

EN

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

5

Energy efficient and environmentally friendly hybrid conversion of inland passenger vessel

51%

Litwin W. , Lesniewski W. , Kowalski J.

Polish Maritime Research

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2017

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tom 24

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nr 4

EN

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