An improved kurtogram method and its application in fault diagnosis of rolling element bearings under complex interferences
GU Xiao-hui 1,2 , YANG Shao-pu 1,2 , LIU Yong-qiang 2 , LIAO Ying-ying 2
1.School of Traffic and Transportation, Shijiazhuang Tiedao University, Shijiazhuang 050043, China；
2. Hebei Provincial Key Lab of Mechanical Evolution and Control of Traffic Structure, Shijiazhuang 050043, China
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.
顾晓辉1,2, 杨绍普1,2, 刘永强2, 廖英英2. 一种改进的峭度图方法及其在复杂干扰下轴承故障诊断中的应用[J]. 振动与冲击, 2017, 36(23): 187-193.
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. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(23): 187-193.
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