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Title: A wavelet cluster-based band-pass filtering and envelope demodulation approach with application to fault diagnosis in a dry vacuum pump
Authors: Jiang, W.
Spurgeon, Sarah K.
Twiddle, J. A.
Schlindwein, Fernando Soares
Feng, Y.
Thanagasundram, S.
First Published: 2007
Publisher: Professional Engineering Publishing
Citation: Proceedings of the I MECH E Part C Journal of Mechanical Engineering Science, 2007, 221(11), pp.1279-1286.
Abstract: 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.
DOI Link: 10.1243/09544062JMES544
ISSN: 0954-4062 (Print) 2041-2983(Online)
Type: Article
Rights: This is the publisher-produced PDF of the article published as Proceedings of the I MECH E Part C Journal of Mechanical Engineering Science, 2007, 221(11), pp.1279-1286. The published version is available on the publisher's webiste at: DOI: 10.1243/09544062JMES544
Appears in Collections:Published Articles, Dept. of Engineering

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