In the paper, basing on developed computation programs. the optimum states of operation of a multi-engine ship propelling system are analysed for the research and prevention vessel „Imor II”, for ship speeds v<4 knots. In the analyses, for the expected ranges of variability of technical and operational parameters of the ship, characteristics of the main engines are used. and their influence on possible fuel cost savings are determined.
A method for preliminary optimisation of the selection of high speed ship engines is presented using the example of MAN engines which form a part of Diesel-electric units of DEMP A/S. After appropriate adaptation of the component functions of the objective function, i.e. of the cost of purchasing the engine and of the cost of consumed fuel, the presented method allows to make comparative calculations for other main engines and to take simultaneously into account a given structure of the propelling installation.
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