一种基于承载效率准则的复合材料机翼结构布局优化方法(英文)

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 Layout Optimization Method of Composite Wing Structures Based on Carrying Efficiency Criterion

A two-level layout optimization strategy is proposed in this paper for large-scale composite wing structures. Design requirements are adjusted at the system level according to structural deformation, while the layout is optimized at the subsystem level to satisfy the constraints from system level. The approaching degrees of various failure critical loads in wing panels are employed to gauge the structure's carrying efficiency. By optimizing the efficiency as an objective, the continuity of the problem could be guaranteed. Stiffened wing panels are modeled by the equivalent orthotropic plates, and the global buckling load is predicted by energy method. The nonlinear effect of stringers' support elasticity on skin local buckle resistance is investigated and approximated by neural network (NN) surrogate model. These failure predictions are based on analytical solutions, which could effectively save calculation resources. Finally, the integral optimization of a large-scale wing structure is completed as an example. The result fulfills design requirements and shows the feasibility of this method.