フラクタル分枝限定法による超音速フラッタ速度向上の複合材料積層構成最適化

抄録

Fractal branch and bound method has developed by authors for optimization of stacking sequences to maximize buckling load of composite structures. The method demands an approximation of a design space with a response surface of quadratic polynomials for trimming fractal branches of stacking sequences. The approximation of the objective function with quadratic polynomials has been confirmed for the buckling load maximizations using lamination parameters as predictors. Although maximizations of flutter limits of composite panels for supersonic flow has already shown by several researchers, it is not clarified that the design space of the supersonic flutter limit can be approximated with quadratic polynomials. The present paper describes the approximations using quadratic polynomials with lamination parameters as predictors are performed to investigate the effectiveness of the method for the supersonic panel flutter of composite laminates. As a result, the method is successfully applied, and the practical optimal stacking sequence is obtained using modified response surfaces.