630 MOGAを用いた積層円筒殻の非線形振動最適化

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This paper presents the optimization for nonlinear vibration of laminated composite, circular cylindrical shells by using Multi-Objective Genetic Algorithm (MOGA). For this purpose, a backbone curve equation for primary resonance of the shell is first derived from nonlinear vibration analysis using the harmonic balance method analytically. In optimization, fiber angles for each lamina of a symmetrically balanced laminated shell are taken as discrete design variables, and then nonlinear natural frequency and linear natural frequency are considered as object functions to be maximized. In numerical calculations Fonseca-type MOGA is employed for the present problem and parete optimum solutions are obtained. Finally optimal stacking sequence of the shell is studied by considering both of the linear vibration and nonlinear vibration characteristics of the shell.
2005-08-22