Abstract:

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.

Key words: finite element model, non-proport ion damping, complex model dat a, model updating