Fault diagnosis of rolling bearings under a variable rotating speed based on iterative generalized demodulation gear signal separation

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (23) : 38-44.

LI Hongxian， TANG Baoping， HAN Yan,DENG Lei

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Abstract

Under a variable rotating speed condition,gear meshing can cover faulty bearing shock characteristics and make bearing fault characteristic information be weak.Aiming at effects of gear meshing on bearing fault diagnosis,a new method for variable rotating speed rolling bearing fault diagnosis based on the iterative generalized demodulation (IGD) gear signal separation was proposed.Firstly,The instantaneous dominant meshing multiply (IDMM) was extracted from the envelope time-frequency spectrum with the peak value searching algorithm to construct phase functions for various generalized demodulation functions with the IDMM trend line.Secondly,the gear meshing frequency and its frequency multiplication signals were separated from gear signals with the IGD algorithm,and residual signals were used to determine higher frequency resonance filtering parameters caused by faulty bearing with the spectral kurtosis algorithm and then bandpass filtering was done.Finally,the IDMM trend line extracted were taken as the bearing rotating frequency to perform angular domain resampling for filtered results.The order spectrum was used to judge rolling bearing’s operational state.The processed results of simulated signals and actual tested ones showed that the proposed method can be used to effectively realize time-varying rotating speed rolling bearing fault diagnosis without a tachometer．

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variable speed / rolling bearing / gear interference / IGD / fault diagnosis

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LI Hongxian， TANG Baoping， HAN Yan,DENG Lei. Fault diagnosis of rolling bearings under a variable rotating speed based on iterative generalized demodulation gear signal separation[J]. Journal of Vibration and Shock, 2018, 37(23): 38-44

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