応答曲面法を用いた油槽船舷側タンク横強度部材の形状最適化

概要

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In case of optimizing the structures of ships, designers often select one of the responses such as weight, stress, cost, etc., as an objective function, and consider other responses to be constraints. The reason for this is that the multi-objective optimization considering several responses simultaneously is very difficult to perform. Thus, we applied response surface methodology (RSM) to this problem together with the concept of Pareto set. RSM is composed of design of experiment (DOE) and the least square method. One of the principal features of RSM is that we can obtain response function with minimizing the number of response evaluations by using DOE. Another advantage of RSM is the capability of displaying the performance of designs as a response surface that is represented by the obtained response function. In multi-objective optimization problems, the concept of Pareto set is also very useful for trade-off between candidate designs. In this paper, we propose a method of multi-objective optimization using the above mentioned techniques and the concept, and the effectiveness of the method is verified by the results of optimization of oil tankers' transverse structures.