Skip to Main content Skip to Navigation
Theses

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.
Document type :
Theses
Complete list of metadatas

Cited literature [121 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/pastel-00000640
Contributor : Ecole Des Ponts Paristech <>
Submitted on : Friday, April 2, 2004 - 8:00:00 AM
Last modification on : Friday, April 2, 2004 - 8:00:00 AM
Long-term archiving on: : Monday, October 4, 2010 - 1:10:51 PM

Identifiers

  • HAL Id : pastel-00000640, version 1

Collections

Citation

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

Share

Metrics

Record views

337

Files downloads

648