An improved Kurtogram based on band-pass envelope spectral Kurtosis with its application in bearing fault diagnosis

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (23) : 171-179.

ZHANG Long1,2,3， MAO Zhide2， YANG Shixi1， LI Xinglin3

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Abstract

Kurtogram is an effective approach to determine the band-pass filter’s central frequency and band width parameters in the resonant demodulation method applied in rolling bearing fault diagnosis.In Kurtogram,a time domain signal’s Kurtosis value was taken as the filtering effect measure index,but this index was easy to be affected by non-Gaussian noise and occasional non-periodic impact,and cause wrong selection of filtering frequency band.Here,considering feature difference between the envelope spectrum of occasional impact and non-Gaussian noise and that of periodic impact,removing the influence of impacts caused by gear local fault and rotor rubbing,the middle segment of the filtered signal’s envelope spectrum was intercepted according to a certain rule,the Kurtosis of this segment envelope spectrum was proposed to measure the strength of periodic impact and called the band-pass envelope spectral kurtosis.The band-pass envelope spectral Kurtosis was employed to replace the filtered time domain signal’s Kurtosis and obtain an improved Kurtogram method.The effectiveness and advantages of the proposed method were verified with analyses of simulation signals and actual measured signals.

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resonant demodulation / spectral kurtosis / fault diagnosis / feature extraction

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ZHANG Long1,2,3， MAO Zhide2， YANG Shixi1， LI Xinglin3. An improved Kurtogram based on band-pass envelope spectral Kurtosis with its application in bearing fault diagnosis[J]. Journal of Vibration and Shock, 2018, 37(23): 171-179

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