DYNAMICAL FINITE ELEMENT MODEL UPDATING METHODS BY ADDING KNOWN MASSES
Model updating by adding known masses is a new approach of correcting the mass matrix and stiffness matrix of the finite element model of the structure. A limitation of this approach is that if the number of available vibration modes measured is too small, the accuracy of model updating will be insufficient for engineering applications. Two methods are proposed in this paper to improve the accuracy of model updating. In the first method, an iterative algorithm is presented for the cases that the updating coefficient matrix is full row rank, this iterative algorithm improves the accuracy but requires extra experiment expenses. In the second method, based on the fact that the distribution of structural modeling errors is usually localized, a localized model updating approach is proposed. This model updating method enforces additional constraint on the updating equations according to possible distribution of model errors, so that the updating equations can be simplified as overdetermined equations. Two numerical examples, a 25 DOF mass- spring system and a scaled straight wing are used to verify the accuracy and effectiveness of the proposed methods.
Bin Li Zhi-Chun Yang Hao Sun
School of Aeronautics, Northwestern Polytechnical University, P.R. China
国际会议
长沙
英文
696-701
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）