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A wavelet cluster-based band-pass filtering and envelope demodulation approach with application to fault diagnosis in a dry vacuum pump.pdf (295.5 kB)

A wavelet cluster-based band-pass filtering and envelope demodulation approach with application to fault diagnosis in a dry vacuum pump

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posted on 2010-10-18, 10:58 authored by W. Jiang, Sarah K. Spurgeon, J. A. Twiddle, Fernando Soares Schlindwein, Y. Feng, S. Thanagasundram
A Morlet-like wavelet cluster-based method for band-pass filtering and envelope demodulation is described. Via appropriate choice of wavelet parameters, a wavelet cluster combined with multi-Morlet-like wavelets can be used as a band-pass filter with zero phase shift, flat topped pass-band and rapid attenuation in the transition band. It can be used to extract high frequency natural vibration components. The imaginary part of the Morlet-like wavelet cluster is the Hilbert transformation of its real part. This can be used to implement envelope demodulation and extract the envelope component of the high frequency resonance band. The method is applied for fault diagnosis relating to bearing defects in a dry vacuum pump. It is shown that the fault characteristic frequencies can be extracted effectively. The efficacy of the method is demonstrated in experimental studies.

History

Citation

Proceedings of the I MECH E Part C Journal of Mechanical Engineering Science, 2007, 221(11), pp.1279-1286.

Published in

Proceedings of the I MECH E Part C Journal of Mechanical Engineering Science

Publisher

Professional Engineering Publishing

issn

0954-4062 (Print) 2041-2983(Online)

Copyright date

2007

Available date

2010-10-18

Publisher version

http://pic.sagepub.com/content/221/11/1279

Language

en

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