Dynamical Model Updating Based on Modal Tests with Changed Structure  

作　　者：王轲 杨健 

机构地区：[1]State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics&Astronautics

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2014年第1期56-62,共7页南京航空航天大学学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China(″863″Program)(2008AA12A205);the Aeronautical Science Foundation of China(2012ZA52001)

摘　　要：A new approach to modifying the stiffness and mass matrices of finite element models is presented to improve the calculation precision.By measuring the mode frequencies and shapes of both of the original and the new structures with changed stiffness and mass,the stiffness and mass matrices of the finite element model can be updated through matrices calculation and solving algebra equations.Taking a multi-freedom model as an example,the relation between the number of the modes and the correction precision of stiffness and mass matrix elements is researched.The facility and precision of the method are totally confirmed especially when the modeling error is known limited to a definite local range.The feasibility of the approach is proven by an effective engineering application to the model updating of a wing piece used in flutter test.A new approach to modifying the stiffness and mass matrices of finite element models is presented to improve the calculation precision. By measuring the mode frequencies and shapes of both of the original and the new structures with changed stiffness and mass, the stiffness and mass matrices of the finite element model can be updated through matrices calculation and solving algebra equations. Taking a multi-freedom model as an example, the relation between the number of the modes and the correction precision of stiffness and mass matrix elements is researched. The facility and precision of the method are totally confirmed especially when the modeling error is known limited to a definite local range. The feasibility of the approach is proven by an effective engineering application to the model updating of a wing piece used in flutter test.

关 键 词：finite element structural dynamics building model model updating modal analysis 

分 类 号：O327[理学—一般力学与力学基础]