A Wavelet Spectrum Technique for Machinery Fault Diagnosis
Derek Kanneg, Wilson Wang
DOI: 10.4236/jsip.2011.24046   PDF   HTML     6,340 Downloads   10,697 Views   Citations


Rotary machines are widely used in various applications. A reliable machinery fault detection technique is critically needed in industries to prevent the machinery system’s performance degradation, malfunction, or even catastrophic failures. The challenge for reliable fault diagnosis is related to the analysis of non-stationary features. In this paper, a wavelet spectrum (WS) technique is proposed to tackle the challenge of feature extraction from these non-stationary signatures; this work will focus on fault detection in rolling element bearings. The vibration signatures are first analyzed by a wavelet transform to demodulate representative features; the periodic features are then enhanced by cross-correlating the resulting wavelet coefficient functions over several contributive neighboring wavelet bands. The effectiveness of the proposed technique is examined by experimental tests corresponding to different bearing conditions. Test results show that the developed WS technique is an effective signal processing approach for non-stationary feature extraction and analysis, and it can be applied effectively for bearing fault detection.

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D. Kanneg and W. Wang, "A Wavelet Spectrum Technique for Machinery Fault Diagnosis," Journal of Signal and Information Processing, Vol. 2 No. 4, 2011, pp. 322-329. doi: 10.4236/jsip.2011.24046.

Conflicts of Interest

The authors declare no conflicts of interest.


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