構造物の動特性の最適変更法に関する基礎研究(第2報)

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This paper discusses the multi-level optimization method in dynamic optimization problems, through stiffened plate of ship structures. In structural optimization, the computational cost increases rapidly as the number of design variables increases. And we need a great amount of calculation and time on problems of modified dynamic characteristics of large and complicated structures. In this paper, the multi-level optimization is proposed, which decreases computational time and cost. The dynamic optimum designs of stiffened plate that control the natural frequency and minimize weight subjected to constraints condition are derived. The way to apply the multi-level optimization methods in this study follows: In the first step, the dynamic characteristics is controlled for the two-dimensional model of stiffened plate by sensitivity analysis and quasi-least squares methods. In the second step, the cross-section of the stiffener is decided so that the weight is minimized under needed constraints by the sensitivity analysis method. In the third step, the three-dimensional model is made based on the results of the first step and the second step, confirmation and finer tuning of the objective function are carried out. In the first report, plate and boxy structure were made to be the analysis object model. In making plate thickness, plate density, and rigidity of the pillar of the boxy structure to be a design variable, the optimum dynamic characteristic was changed. In the second report, by making rectangle stiffened plate which constitutes the ship structure to be an analytical model, changing the dynamic characteristics of the stiffened plate, and applying multi-level optimization method to the optimum design which reduces the weight, the effectiveness is examined. It is shown that the results are effective in the optimum modification for dynamic characteristics of the stiffened plate.
社団法人日本船舶海洋工学会の論文
1999-09-04

構造物の動特性の最適変更法に関する基礎研究(第2報)

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