In this article, the basic hydrodynamic concepts of ship resistance and propulsion are introduced with a focus on power prediction in the early stages of design. The historical developments in ship performance prediction and the role of methodical series of ship hulls and propellers in power prediction are discussed in detail. Ship propulsion is separated from its basic components, and hull geometry aspects that are relevant to resistance and propulsion are introduced. Specific attention is paid to the developmental approach toward statistical prediction methods, their application domain, and their limits. Finally, the application of these methods within the daily practice of ship design and how to use proprietary model test and sea trials data in order to improve prediction accuracy are discussed.
SynopsisWithin the scope of the Royal Netherlands Navy's Walrus class replacement programme, DMO embarked in 2015 in developing a set of tools to generate and assess submarine concept designs. MARIN took up the challenge to develop a design workflow SUPREME on the basis of its Quaestor3 knowledge engineering framework [van Hees 1997[van Hees , 2003[van Hees , 2009. Within this workflow a number of proprietary and often confidential tools should be plugged in to perform e.g. propulsion system dimensioning, weight estimation and for assessment of trimming and compensation capabilities. These 'satellite' tools are mostly developed for, or by, DMO. As a design system, SUPREME becomes fully operational at DMO where workflow and proprietary tools come together. The developmental focus of MARIN is the SUPREME workflow which deals with design knowledge representation and design data management. The two major challenges in its development were the topological representation and the weight management methodology. This paper will discuss the first one, the development of a submarine topological representation using the CAD system Rhinoceros TM as externally controlled geometry generator. This combines high accuracy with adaptability and enables naval architects to constantly monitor the weight and volume balances and trimming / compensation capabilities of concept submarines already in the earliest stages of design.
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