STUDY ON MODAL PARAMETERS IDENTIFICATION BASED WAVELET TRANSFORMAND BOOTSTRAP THEORY

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (5) : 131-136.

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STUDY ON MODAL PARAMETERS IDENTIFICATION BASED WAVELET TRANSFORMAND BOOTSTRAP THEORY

ZHANG Qiang， WU Qing-ming

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Abstract

A new method of parametric identification based on wavelet transform and bootstrap theory is proposed in this paper to identify modal parameters of multiple-DOF system. With modified Morlet continuous wavelet transform, measured responses are represented in time-frequency domain, after the analysis of time and frequency resolutions, the optimal parameters of wavelet function are determined by Shannon entropy. The statistical confidence intervals on modal parameters are estimated by bootstrap theory. A simulation and an experiment were carried out on a vibration platform to validate the proposed method.

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wavelet transform / the minimum Shannon entropy / bootstrap theory / confidence interval

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ZHANG Qiang;WU Qing-ming. STUDY ON MODAL PARAMETERS IDENTIFICATION BASED WAVELET TRANSFORMAND BOOTSTRAP THEORY[J]. Journal of Vibration and Shock, 2009, 28(5): 131-136