Identification and Prediction of F-shape Structure Dynamics by Spatial Matrix Identification Method

摘要

This paper presents the results of using an experimental spatial matrix identification method to predict therndynamics of a F-shape structure after changing the boundary condition. The single-input-multiple-outputrnfrequency response functions (SIMO FRFs) of the F-shape structure in three directions at 17 points under thernfree-free boundary condition are measured by hammer testing. Using the sets of SIMO FRFs, thernidentifications of spatial matrices are executed. The FRFs calculated from identified spatial matrices are wellrnfitted with experimental FRFs. The rigid body properties are also estimated using identified mass matrices inrnpractical accuracy. Using the sets of spatial matrices, the dynamic characteristics of the F-shape structurernunder the boundary condition of clamping 2 points is predicted. It is shown that this method can predictrndynamic characteristics after changing boundary conditions in practical accuracy.