基于稳定性约束复合材料加筋板结构优化设计

摘要

A two-level optimization method using lamination parameters to a stiffened panel is presented.First,optimization is performed using feasible-direction method and maximum strain energy criteria based on Patran/Nastran analysis to get optimum layer thicknesses of every element of the typical stiffened panel.Then,tournament selection genetic algorithm（GA） is performed based on the objective lamination parameters to get the best stacking sequence for satisfying manufacturing constraints.The buckling load of the typical stiffened panel is calculated by engineering method.Finally,the optimization method we proposed is used to optimize a stiffened panel under axial loads.The results show that the weight is reduced by 22.3% and the composite stiffened panel that satisfys manufacturing requirements is obtained.The numerical example demonstrates the feasibility of the method.%针对复合材料机翼壁板一加筋板结构提出引进几何因子概念的两级优化方法,即先在Pat-ran/Nastran分析的基础上利用可行方向法和最大应变能准则得出加筋板各组成单元的最优厚度,再基于目标几何因子应用锦标赛选择遗传算法得出加筋板满足工艺要求的最佳铺层顺序。并给出加筋板在轴压下失稳临界载荷的工程计算方法。最后采用本文提出的优化方法对承受轴向载荷下的加筋板进行优化。结果表明重量减轻22.3%,并得到满足铺层工艺要求的复合材料加筋板结构,验证了该优化策略的合理性。