In order to overcome the shortcomings in the traditional envelope analysis in which manually specifying a resonant frequency band is required, a new approach based on the fusion of the wavelet transform and envelope spectrum is proposed for detecting and localizing defects in rolling element bearings. This approach is capable of completely extracting the characteristic frequencies related to the defect from the resonant frequency band. Based on the Shannon entropy of wavelet-based envelope spectra, a criterion to select optimal scale to monitor the condition of bearings is also presented. Experiment results show that the proposed approach is sensitive and reliable in detecting defects on the outer race, inner race, and rollers of bearings.
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e-mail: dfshi@hotmail.com
e-mail: w.j.wang@sussex.ac.uk
e-mail: lsqu@xjtu.edu.cn
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October 2004
Technical Papers
Defect Detection for Bearings Using Envelope Spectra of Wavelet Transform
D. F. Shi,
e-mail: dfshi@hotmail.com
D. F. Shi
Institute of Vibration Engineering Research, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, PR China
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W. J. Wang,
e-mail: w.j.wang@sussex.ac.uk
W. J. Wang
Department of Engineering & Design, University of Sussex, Brighton BN1 9QT, England
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L. S. Qu
e-mail: lsqu@xjtu.edu.cn
L. S. Qu
Research Institute of Diagnostics and Cybernetics, Xian Jiaotong University, Xian 710049, PR China
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D. F. Shi
Institute of Vibration Engineering Research, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, PR China
e-mail: dfshi@hotmail.com
W. J. Wang
Department of Engineering & Design, University of Sussex, Brighton BN1 9QT, England
e-mail: w.j.wang@sussex.ac.uk
L. S. Qu
Research Institute of Diagnostics and Cybernetics, Xian Jiaotong University, Xian 710049, PR China
e-mail: lsqu@xjtu.edu.cn
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received October 2002; final revision June 2004. Associate Editor: Lawrence A. Bergman.
J. Vib. Acoust. Oct 2004, 126(4): 567-573 (7 pages)
Published Online: December 21, 2004
Article history
Received:
October 1, 2002
Revised:
June 1, 2004
Online:
December 21, 2004
Citation
Shi, D. F., Wang, W. J., and Qu, L. S. (December 21, 2004). "Defect Detection for Bearings Using Envelope Spectra of Wavelet Transform ." ASME. J. Vib. Acoust. October 2004; 126(4): 567–573. https://doi.org/10.1115/1.1804995
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