Identification and prediction of frame structure dynamics by spatial matrix identification method

This paper presents the results of using an experimental spatial matrix ide ntification method to predict the dynamics of a frame structure under vario us boundary conditions. The single-input-multiple-output frequency response functions (FRFs) of the test structure under the free-free boundary condit ion are measured by hammer testing. Using the FRFs, a set of spatial matric es is constructed in order to represent the structural dynamic characterist ics of the system by the new method. Using the spatial matrices, the dynami c characteristics of the test structure under the boundary condition of cla mping 4 points is predicted. The prediction is adequately accurate for prac tical application. The results of the prediction demonstrate that the spati al matrices identified by this method can be used for structural modificati on and substructure synthesis in the field of computer-aided mechanical eng ineering.