基于NSGA-Ⅱ算法的机翼风洞模型静强度试验加载方案优化设计

Optimal Design of Loading Program for Static Strength Test of Wing Wind Tunnel Model Based on NSGA-Ⅱ Algorithm

针对机翼风洞模型的静强度试验,提出一种基于NSGA-Ⅱ算法试验加载方案的优化设计方法,包括加载布局的设计和试验载荷的多目标优化设计。加载布局的设计中引入控制剖面的设置,并在此基础上建立试验载荷的多目标优化设计模型,以控制剖面内的剪力、弯矩和转矩误差为优化目标,以静力等效原则和误差最小要求为约束条件,并以CHN-T1标模为例,基于NSGA-Ⅱ算法进行多目标优化模型的求解,算法采用可行性法则处理约束条件。最终求解出最优的试验加载方案并进行方案的有限元仿真验证。结果表明:试验方案与流固耦合下的理想试验的最大等效应力、应变值和变形位移的误差均小于6%,经优化设计的加载方案较好地模拟了气动载荷。

This paper proposes an optimal design method of test loading program based on NSGA-II algorithm for the static strength test of wing wind tunnel model,which includes the design of loading layout and multi-objective optimization design of test load.The setting of the constrained sections is introduced in the design of the loading layout,and on whose basis,a multi-objective optimal design model for the test load is established,taking shear force,bending moment and torque errors within the constrained sections as the optimization objectives and the static equivalence principle and the minimum error requirement as the constraints.The multi-objective optimization model is solved based on the NSGA-II algorithm by taking the CHN-T1 standard model as an example,and with the algorithm using the feasibility law deals with the constraints to solve the optimal test load program finally and conduct the finite element simulation of the program for verification.The results show that the errors of the maximum equivalent stress,strain value and deformation of the test program and the ideal test under fluid-structure coupling are less than 6%,and the optimized loading program well simulates aerodynamic load.