Model Parameter Estimation with Multi-reference Curve Fitting : Vibration, Control Engineering, Engineering for Industry

概要

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Many kinds of curve fit techniques have been developed for the estimation of the modal parameters of a mechanical structure, using the theory of modal analysis. As one of the most popular curve fit techniques which correspond to the multiple input vibration test, Vold's method in the time domain (Poly-reference) is well-known and used extensively. In this paper, a new method which results from improving Vold's method in the time domain is proposed to obtain global modal parameters. In Vold's method, residues are determined by using every column of the transfer function matrix. Then, any two columns of residue matrix contradict each other. In the proposed method, the residues are obtained at the same time by using all of the transfer function matrix. And such contradiction can be solved. With this method, modal parameters of the fly wheel of an automobile are identified. Comparing this new method with former methods, the validity of the new method is confirmed.
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