基于时域多普勒校正和EEMD的列车轴承道旁声音监测故障诊断方法研究
刘方;沈长青;何清波;胡飞;张翱;孔凡让
振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 104-109.
基于时域多普勒校正和EEMD的列车轴承道旁声音监测故障诊断方法研究
Research on wayside acoustic fault diagnosis for locomotive bearings based on time-domain Doppler effect correction and EEMD method
A new method of wayside acoustic fault diagnosis for locomotive bearings is presented in this paper. In this method, firstly, time-domain Doppler effect correction is implemented for the bearing’s acoustic signal recorded by the wayside microphone. Such problems as frequency shift, frequency band expansion and amplitude modulation can be solved through this correction. Secondly, the Ensemble empirical mode decomposition (EEMD) method is applied to extract the Intrinsic Mode Functions (IMFs) which contains the fault signature of the bearings. Finally the envelope spectrum of the selected IMF is calculated to decide whether the bearing is defective. This method is applied to the feature extraction for a locomotive bearing with a single defect on the outer race and inner race, respectively. The results show that the proposed method can reduce the Doppler effect embedded in the bearing’s acoustic signal and can extract the fault signature of the locomotive bearings.
列车轴承 / 故障诊断 / 多普勒校正 / EEMD {{custom_keyword}} /
Locomotive bearing / Fault diagnosis / Doppler effect correction / EEMD {{custom_keyword}} /
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