Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 25, Issue 5, Pages 1738-1749Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2010.12.011
Keywords
Kurtogram; Wavelet packet transform; Rolling element bearings; Fault diagnosis
Categories
Funding
- National Natural Science Foundation of China [51005172]
- Fundamental Research Funds for the Central Universities
- Ministry of Human Resources and Social Security of China
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Kurtogram, due to the superiority of detecting and characterizing transients in a signal, has been proved to be a very powerful and practical tool in machinery fault diagnosis. Kurtogram, based on the short time Fourier transform (STFT) or FIR filters, however, limits the accuracy improvement of kurtogram in extracting transient characteristics from a noisy signal and identifying machinery fault. Therefore, more precise filters need to be developed and incorporated into the kurtogram method to overcome its shortcomings and to further enhance its accuracy in discovering characteristics and detecting faults. The filter based on wavelet packet transform (WPT) can filter out noise and precisely match the fault characteristics of noisy signals. By introducing WPT into kurtogram, this paper proposes an improved kurtogram method adopting WPT as the filter of kurtogram to overcome the shortcomings of the original kurtogram. The vibration signals collected from rolling element bearings are used to demonstrate the improved performance of the proposed method compared with the original kurtogram. The results verify the effectiveness of the method in extracting fault characteristics and diagnosing faults of rolling element bearings. (C) 2011 Elsevier Ltd. All rights reserved.
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