基于实验复模态参数的有限元模型修正

提出了一种利用非完备实验复模态参数，修正带有非比例阻尼矩阵结构有限元模型的迭代修正方法。首先，对处理困难的阻尼矩阵表达为质量与刚度矩阵的多项式组合，并给出了物理解释，被修正参数为该多项式的系数和结构的某些局部几何、材料参数，其修正结构物理意义明确，与结构的动态设计相适应，实例表明了本文修正方法的有效性。

UPDATING DESIGN PARAMETERS OF FINITE ELEMENT MODEL BY USING TEST COMPLEX MODAL DATA

A method of finite element model updating via iteration by using incomplete test complex modal data is presented.For the conveninence of updating,the system non proportion damping matrix is expressed into a matrix polynomial of the mass and stiffness matrixes,and the physical meaning of the polynomial is explained.The updating parameters are the polynomial coefficient and structural design parameters (such as local geometric and material parameters).So the model updated has a clear physical meaning.The method can be applied not only to the FEM updating,but also to structural dynamical design.Numerical examples show its efficiency and accuracy.