机翼结构梁模型修正及不确定性传递精度研究

Research on model modification and uncertainty transfer accuracy of wing structural's beam model

机翼梁模型对于颤振预测和飞行载荷识别十分重要。采用MATLAB+Hypermesh联合建模方法建立细节模型,基于闭室原理建立梁单元机翼模型(简称梁模型),对梁模型进行了模态试验,并采用秃鹫算法对梁模型进行修正。比较了细节模型与修正后梁模型的频率误差与MAC值,结果显示,修正后的梁模型能够达到和细节模型相当的精度,梁模型的频率误差在5%以内,MAC值对角元素大于0.75。基于正态分布的不确定性反向传递研究结果表明,细节模型保留的局部信息较多,用于不确定性研究结果更加准确,未经修正的梁模型精度过低,不能用于不确定性研究,而修正后的梁模型也能满足不确定性研究的精度要求。

Wing beam model is very important for flutter prediction and flight load identification.In this paper,the modal test of the wing model is carried out,the detail model is established based on the joint modeling method,the beam model is established based on the closed cell principle,and the beam model is modified using the vulture optimization algorithm.The frequency error and MAC value of the detail model and the modified beam model are compared.The results show that the modified beam model can achieve the same accuracy as the detail model,where the frequency error of the beam model is within 5%,and the MAC value diagonal element is greater than 0.75.However,the detail model retains more local information,which is more accurate for uncertainty research.The accuracy of the uncorrected beam model is too poor to be used for uncertainty research,and the modified beam model can also reach the accuracy of uncertainty research.