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RESEARCH PAPERS

A Time-Frequency Distribution for Analysis of Signals with Transient Components and Its Application to Vibration Analysis

[+] Author and Article Information
G. T. Zheng

Department of Astronautics and Applied Mechanics, Harbin Institute of Technology, Harbin, China

P. D. McFadden

Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, England

J. Vib. Acoust 121(3), 328-333 (Jul 01, 1999) (6 pages) doi:10.1115/1.2893984 History: Received September 01, 1996; Revised October 01, 1998; Online February 26, 2008

Abstract

Bilinear time-frequency distributions, which provide simultaneous high resolution in both time and frequency domains, offer advantages for the analysis of vibration signals where the harmonic components and sidebands may be closely spaced. However, the Choi-Williams exponential distribution is found to be unsuitable, and aliasing produced by distributions of the Cohen class also causes problems. An aliasfree exponential time-frequency distribution is introduced, which combines features of distributions of the Cohen class and the generalized Wigner distribution. The new distribution is shown to be well suited to the analysis of signals with transient components.

Copyright © 1999 by The American Society of Mechanical Engineers
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