1403 積層円筒殻の非線形振動最適化における積層形態特性について(OS8-1 多目的最適化と設計空間探査I)  [in Japanese] 1403 On the Characteristics of Optimal Staking Sequence for Nonlinear Vibration of Laminated Composite Circular Cylindrical Shells  [in Japanese]

This paper studies the characteristics of optimal staking sequence for nonlinear vibration of laminated composite circular cylindrical shells. For this purpose, the backbone curve equation for primary resonance is derived analytically by using the Galerkin's method and the harmonic balance method. In optimization, fiber angles of each lamina for a symmetrically balanced laminates are taken as discrete design variables, and nonlinear and linear frequency are taken as object functions to be maximized simultaneously. In numerical calculations Multi Objective Genetic Algorithm (MOGA) with Fonseca-type rank evaluation, sharing technique and elitist strategy is employed, and thus pareto optimum solutions are obtained numerically. Finally optimal stacking sequence is discussed by comparing the backbone curves obtained for the pareto solutions.