Trans RINA, Vol 153, Part A1, Intl J Maritime Eng, Jan-Mar 2011


Figure 4: The Initial Ship Sizing Iterative Sequence showing Assumptions and Sources [20]


Having spelt out the main stages in a major new ship concept design process, it is worth focusing on the specific technical step in the representation of the overall ship design process (see Figure 3). The first part of the “Synthesis of Ship Gross Sizing and Architecture” step, namely the sizing process, was expanded in Reference 20 as “The Warship Initial Sizing Process” and is often referred to as a numerical synthesis. It is important to appreciate such iterative sequences


have significant


caveats underlying their adoption. This was reinforced in the author’s comments at Reference 21 that such iterative sequences should not be used without acknowledging the range of caveats implied in their use. The complete Figure 4 shows, in some detail, the “Assumptions” and


“Sources” typically behind any such numerically based synthesis. Finally it is worth remarking that the overall process diagram of Figure 3 has considerable feedback loops, not just to show reconsideration of the decisions on the various selections, starting with design style, but also feeding right back to the initial requirements. This can then inform the dialogue with the requirements owner and, as such, is consistent with the message of the first bubble in Figure 2.


Figure 4, representing the “traditional” numerical


synthesis, can be compared with the much more comprehensive and sophisticated architecturally based approach to initial ship synthesis subsequently pioneered


©2011: The Royal Institution of Naval Architects


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