Fuzzy Optimum Design of Engine Room of Ship with Dynamic Response Using Genetic Algorithms

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In this paper, the theory of fuzzy set is introduced to the optimization of engine room structure considering the dynamic response constraints. Two ways of solving the fuzzy optimization are investigated. Firstly, the constraints of static stresses and dynamic response to the external excitation are handled by the fuzzy set theory. By this approach, a family of optimal designs under different degrees of satisfaction with constraints for the structure can be obtained. Secondly, the objective is also considered to be a fuzzy variable with its own membership function. Through maximizing the degree of membership to the fuzzy decision, a crisp solution can be provided to designers. A Genetic Algorithm (GA) is applied to do the optimization. The optimum results for the numerical example are presented and it is shown that the proposed method for the dynamic response optimization is applicable.

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