含约束加权最小二乘法的结构试验载荷优化方法

Structure test load optimization with weighted constrained least square method

在先进民机研发过程中,为了提高全尺寸试验验证效率,需要在积木式试验略低一层级进行试验。针对试验载荷优化,基于有限元分析方法,以复材机身舱门曲板结构试验为例,提出了一种采用含约束加权最小二乘法进行试验载荷优化的方法,将试验加载点的作动器量程看作不等式约束,对重点关注区域给予更小的权重系数以提高局部区域拟合精度,计算结果表明所述方法可以确保试验件的受力状态与全尺寸结构受力状态一致。

In the development of advanced civil aircrafts,structure tests can be carried out in the level slightly below the full-scale tests in the perspective of building block tests,for the purpose of improving the efficiency of structure tests.Aiming at the optimization of the test load,the paper proposes a weighted constrained least square method based on the finite element analysis,obtains the best test load for a curved composite fuselage panel test.The method takes the upper and lower bounds of actuator's force output as inequality constrains,and gives smaller weight coefficients to the key focus areas,thereby improving the fitting accuracy in local areas.It shows that the method can ensure that the force state of the panel is consistent with the force state of the full-scale structure,and meet the test loading requirement.