応答曲面法を用いた油槽船隔壁構造の最適化

概要

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When a ship designer carries out ship structural design, he first considers several combinations of design variables related to structural form, structural size, and so on. Next, he carries out response analysis using FEM or some other method, and estimates the performance of each design. Finally, he selects the best design from among the candidates. However, this design-selection procedure carries with it the possibility that the selected combination of design variables may not always be the optimal one, due to the limited number of candidate designs analyzed. Thus, response surface methodology(RSM)is applied in this study to optimize ship structural design. This methodology involves a few sets of mathematical techniques:the method of designing experiments to grasp efficiently the accurate features of a response with a minimal number of analyses, the least squares method to obtain an approximate mathematical expression of the response, and the nonlinear optimization method to find the optimal design, i.e., the minimum or maximum of the response. In this paper, as an example of the application of RSM to ship structural design, the optimization of transverse bulkhead structures of an oil tanker is carried out. The results obtained and the know-how accumulated in using this methodology in optimizing the structural design of ships are shown.
2000-09-25