This paper presents the results of using an experimental spatial matrix identification method to predict the dynamics of a frame structure under various boundary conditions. The single-input-multiple-output frequency response functions (FRFs) of the test structure under the free-free boundary condition are measured by hammer testing. Using the FRFs, a set of spatial matrices is constructed in order to represent the structural dynamic characteristics of the system by the new method. Using the spatial matrices, the dynamic characteristics of the test structure under the boundary condition of clamping 4 points is predicted. The prediction is adequately accurate for practical application. The results of the prediction demonstrate that the spatial matrices identified by this method can be used for structural modification and substructure synthesis in the field of computer-aided mechanical engineering.

Issue Section:
Technical Papers
Keywords:
identification, matrix algebra, frequency response, vibrations
Topics:
Boundary-value problems, Dynamics (Mechanics), Frequency response, Vibration, Testing, Computer-aided engineering, Shapes, Damping, Hammers, Structural dynamics
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Copyright © 2001
 by ASME
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