An improved kurtogram method and its application in fault diagnosis of rolling element bearings under complex interferences

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (23) : 187-193.

GU Xiao-hui 1,2 , YANG Shao-pu 1,2 , LIU Yong-qiang 2 , LIAO Ying-ying 2

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Abstract

Fast Kurtogram is one of the most useful methods in fault diagnosis of rolling element bearings. However, in some cases of complex interferences, it cannot exactly recognize the optimal resonance frequency band for envelope demodulation due to that the kurtosis index is too sensitive to impulsive noise. In fact, the envelope spectrum of demodulated signals in frequency domain has a certain immunity ability to noise, the bearing fault characteristic frequency and its harmonics often appear clearly with typical periodic impulse features in the envelope spectrum. Here, the frequency domain correlated kurtosis was proposed to quantitatively describe envelope spectrum amplitudes of narrow-band signals and generate a kurtogram. Simultaneously, the proposed method was applied in the compound fault detection based on the directivity of correlated kurtosis. In addition, two cases of real bearing fault signals were employed to verify the effectiveness and robustness of the proposed method in bearing weak fault diagnosis and compound fault diagnosis.

Key words

kurtogram / frequency domain correlated kurtosis / envelope analysis / rolling element bearing / fault diagnosis

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GU Xiao-hui 1,2,YANG Shao-pu 1,2,LIU Yong-qiang 2,LIAO Ying-ying 2. An improved kurtogram method and its application in fault diagnosis of rolling element bearings under complex interferences[J]. Journal of Vibration and Shock, 2017, 36(23): 187-193

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