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2.4. Design Spiral The design of a vessel is an iterative process, in which early estimates are made, and then repeatedly corrected and developed as a consequence of feedback from subsequent steps. The multifunctional nature of vessels, they have many conflicting requirements, which have to be met to some degree. Thus the design problem is one of achieving a balanced and adaptable solution, in which uncertainties have been minimized. There is no generally accepted sequential approach to represent the boat design process. Inevitably, however, the adopted process encompasses making a large number of decisions, with each decision or choice greatly affecting the next phase of the design. The adopted process is often repeated with a greater degree of accuracy. The classical way of describing the progressive convergence of the design process to a final configuration is a design spiral. The design progresses in an orderly fashion through a system of processes that address each aspect of boat geometry and boat performance. Within the design spiral concept, the iterative boat design process is considered as a sequence of moves, which gradually define the detail, and thus achieves a balanced conclusion. Figure 2.4. shows design spiral which is used in each phase of designing to reach the balanced design. DESIGN REQUIREMENTS ROUGH GENERAL ARRANGEMENT DESIGN SATISFACTORY COST ESTIMA TE BALANCED DESIGN MAIN DIMENSION HULL FORM DEVELOPMENT STRUCTURAL DESIGN POWERING WEIGHT ESTIMA TE ARRANGMENT DESIGN STABILITY Figure 2.4. Design spiral. WEB_11 (2004) 12PDF Image | FIBER REINFORCED PLASTIC BOAT IN SERIAL PRODUCTION
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