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提出一种针对大型复合材料机翼结构的二级布局优化策略。系统级根据结构形变调整设计指标,子系统级优化结构布局以满足系统级约束。将机翼壁板中各种临界失效载荷的接近程度作为评判结构效率的标准,通过将结构效率作为优化目标,保证了所求解问题的连续性。加筋壁板通过等效的正交异性板模拟,并根据能量原理预测总体失稳载荷。讨论了加强筋支持弹性对于蒙皮抵抗局部失稳性能的影响,并通过神经网络代理模型对其进行逼近。采用解析模型对失效特性做出评估,减少了计算资源的占用。最后以一种大型机翼结构的综合优化作为算例,计算结果满足设计要求,验证了该方法的可行性。
A two-level layout optimization strategy for large composite wing structure is proposed. The system level adjusts the design specifications according to the structural deformation, and the subsystem level optimizes the structural layout to meet system level constraints. The approaching degree of various critical failure loads in the wing panels is taken as the criterion to judge the structural efficiency. By taking the structural efficiency as the optimization objective, the continuity of the solution problem is guaranteed. Reinforced siding is modeled using an equivalent orthotropic plate and predicts the overall destabilizing load based on the energy principle. The effect of stiffener support elasticity on the local buckling resistance of skin is discussed and approximated by neural network proxy model. The analytical model is used to evaluate the failure characteristics and reduce the occupation of computing resources. Finally, a comprehensive optimization of a large wing structure is taken as an example. The calculation results meet the design requirements and the feasibility of the method is verified.