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Dynamical monitoring od structures using continuous wavelet analysis

Tien-Phu Le 
Abstract : The application of the continuous wavelet analysis is proposed for the dynamical monitoring of structures from transient responses under unknown excitations (shock, ambient ...). The numerical tool of the continuous wavelet transform is performed. It is based on the mother wavelet (Morlet or Cauchy) and on the quality factor Q characterizing the mother wavelet. This tool allows extracting instantaneous amplitudes and frequencies within a signal. A domain of the time-frequency plane where the edge effect is negligible, and bounds for Q are determined. The processing of the frequency modulated real signal by the proposed tool facilitates the modal identification of structures (linear and non-linear) and allows an improvement of the impact-echo method. An adapted procedure for every application is detailed. Results obtained from numerical and real tests show the efficiency of the method.
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Submitted on : Friday, April 2, 2004 - 8:00:00 AM
Last modification on : Friday, April 2, 2004 - 8:00:00 AM
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  • HAL Id : pastel-00000640, version 1



Tien-Phu Le. Dynamical monitoring od structures using continuous wavelet analysis. Engineering Sciences [physics]. Ecole des Ponts ParisTech, 2003. English. ⟨pastel-00000640⟩



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