This paper sets out a framework within which information can be passed between the preliminary design stages of both the ship and machinery to inform and progress the designs to select the best overall design. Traditional methods of ship machinery selection are discussed and a new approach of concurrent development of both ship and prime mover is outlined. Metrics that can be used to facilitate the exchange of information between the ship design and machinery development teams are investigated and the "level of integration" of the prime mover into the whole ship design is defined. The limitations of this approach are recognised and the investigation of a gas turbine propulsion system for a large container ship is illustrated as an example application of the approach.
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