计算模型修正的频率响应函数方法

FRF Method of Computation Model Adjustment

本文提出一种有限元动力分析计算模型修正的频率响应函数方法。这个方法综合考虑了系统的质量、刚度,特别是阻尼矩阵的修正,由位置矩阵将修正量集中体现在测量自由度上,利用结构系统的频率响应函数有限元分析值和实测值,计算出模型的质量、阻尼和刚度矩阵的修正量。文中算例结果表明,本方法有较好的修正结果。

A FRF(Frequency Response Function)method for the computation model adjustment of finite ele-ment dynamic analysis is presented in this paper.The correction of mass,stiffness and damping matrices issimutaneously considered.In this method,localized matrix is used to direct the corrected values of mass,stiffness and damping matrices.The corrected values of model are estimated with FRF computed by finiteelement initial model and FRF measured on some degrees of freedom.The simulation results show that themethod is an effective way for the model adjustment.