形状変更ベクトルを用いた応答曲面法による最適船体構造設計 : 二重底側ブラケットについて

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In the optimization of structural design, the designer studies the obtained responses and changes the values of some design variables related to the material properties and structural dimensions in order to improve response, Response analyses are carried out repeatedly until the final design is arrived at. When such a process is adopted, however, a large number of reconstructions of the structural model are required. As a method for reducing the burden of this kind of optimization process, response surface methodology(RSM)has become widely known. By using RSM, we can reduce the number of trials of the numerical or model experiments. The authors have already applied RSM to the optimization problem of a tanker's transverse bulkhead and reported this methodology's effectiveness(Refs.1 and 2). However, because the actual structure of a ship is very complicated, the term number of the approximate polynomials used in the RSM increases rapidly if we take all the related dimensions of the structure into consideration. Therefore, even if we use RSM, the number of structural models becomes enormous, since we need many trial structural analyses to determine the parameters of the approximate polynomials. The concept of basis vectors is introduced in the present study to express structural shape with minimal information. Each basis vector shows the mode change of the shape, and by using this concept it is possible to reduce the number of design variables to a practical range. Thus the number of the necessary analyses can be sustained. In this study, we propose a method that uses the basis vectors in combination with the RSM, and we apply it to hull structural design as a means of efficient optimization. The results of a study to examine the effectiveness of this method in the optimization of a double-bottom side-bracket structure are shown.
2001-09-25

形状変更ベクトルを用いた応答曲面法による最適船体構造設計 : 二重底側ブラケットについて

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