一种动力模型的局部修改方法

本文基于矩阵反问题理论，给出了一种动力学有限元模型的修正方法，这种方法的表达式简洁。考虑到模型误差主要产生于结构的某些特殊部位，因此有限元模型中的误差可以认为是局部性的。为了减少修正时对模型正确部分的影响和减少不必要的计算量，本文只对刚度或质量矩阵的局部加以修正。首先将所要修改的部分重新组成一个矩阵，利用特征方程，建立一个待修正的有限元模型，然后应用本文给出的方法进行修正。本文方法得到数值算例的证

A Section Method for Modification of Dynamic Model

Based on the theory of matrices inverse problem, a method for modification of finite element dynamicmodel, which has a simple formula, is presented in this paper. In order to reduce calculation time, the sections of the stiffness or mass matrices are only modified. By using eigen-equations, A finite element modelcan be established for the elements in the sections. The method for unification in this paper is applied toimproving the model. Numerical experiment shows that the method has less calculation time, simple process and Miter accuracy.