An Advanced Strategy for Detecting Impulses in Mechanical Signals

[+] Author and Article Information
Wen-xian Yang

Institute of Vibration Engineering, Northwestern Polytechnical University, Xi’an 710072, China

Peter W. Tse

Smart Asset Management Research Laboratory, Department of Manufacturing Engineering and Engineering Management, City University of Hong Kong, Hong Kong, China

J. Vib. Acoust 127(3), 280-284 (Jun 01, 2005) (5 pages) doi:10.1115/1.1888590 History: Received March 21, 2002; Revised October 07, 2004; Online May 18, 2005


The appearance of overlapping in the results derived by continuous wavelet transform (CWT) smears the spectral features and makes the results difficult to interpret. This will significantly affect the accuracy of analysis of anomalous signals. Aiming at minimizing the undesired effect of overlapping, a new soft-thresholding method in terms of exponential functions is proposed. Using the proposed soft-threshold and combining with Donoho’s approach for reducing the structures induced by noise, a strategy for purifying the results derived by the CWT is designed. A series of simulated and practical experiments show that, after adopting the proposed strategy, the results of CWT are further purified and thereby the spectral features of the inspected signal become more explicit and much more easily identified.

Copyright © 2005 by American Society of Mechanical Engineers
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