Identification of Structural Dynamics Models Using Wavelet-Generated Impulse Response Data

[+] Author and Article Information
A. N. Robertson, K. C. Park

Department of Aerospace Engineering Sciences and Center for Aerospace Structures, University of Colorado, Boulder, Boulder, Colorado

K. F. Alvin

Structural Dynamics and Vibration Control Department, Sandia National Laboratories, Albuguerque, New Mexico

J. Vib. Acoust 120(1), 261-266 (Jan 01, 1998) (6 pages) doi:10.1115/1.2893815 History: Received May 01, 1995; Revised March 01, 1996; Online February 26, 2008


This paper addresses the use of discrete wavelet transforms for the identification of structural dynamics models. First, the discrete temporal impulse response functions are obtained from vibration records by the discrete wavelet transform (DWT). They are then utilized for system realizations. From the realized state space models, structural modes, mode shapes and damping parameters are extracted. Attention has been focused on a careful comparison of the present DWT system identification approach to the FFT-based approach. Numerical examples demonstrate that the present DWT-based structural system identification procedure is a serious alternative to the FFT-based procedure, and outperforms FFT methods for narrow frequency-band inputs.

Copyright © 1998 by The American Society of Mechanical Engineers
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