基于阶频谱相干的变转速滚动轴承内外圈复合故障特征分离提取

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Abstract Aiming at the problem that compound faults coupling with each other and weak fault features are easy to be interfered and difficult to be identified under the condition of variable speed. In this paper, a method of compound fault features separation and extraction based on demodulation frequency band determination of order-frequency spectral coherence(OFSCoh ) is proposed, which is applied to compound faults diagnosis of rolling bearings under variable speed conditions. Firstly, the signal is calculated by the OFSCoh method. Then, the characteristic frequency band spectrum is obtained by integrating the OFSCoh with the failure order interval of inner and outer race of the bearing, and the fre-quency corresponding to the maximum value in characteristic frequency band spectrum is determined as the center fre-quency of the demodulation band, and the maximal speed frequency is corresponding to 3 times the fault frequency is taken as the bandwidth. Finally, the signal is filtered by band pass, and the improved envelope spectrum(IES) is calculated, so as to realize the separation and extraction of bearing compound fault features. Simulation and experiment verify the effectiveness of the proposed method.
Key words: rolling element bearing; variable speed condition; order-frequency spectral coherence; characteristic frequency band spectrum; compound faults

Key words： rolling element bearing variable speed condition order-frequency spectral coherence characteristic frequency band spectrum compound faults

Received: 08 September 2021 Published: 28 November 2022

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	Articles by authors
	YANG Xinmin
	GUO Yu
	HUA Jianxiang

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YANG Xinmin,GUO Yu,HUA Jianxiang. Feature separation and extraction of compound faults of inner and outer rings of rolling bearings at variable speed based on order-frequency spectral coherence[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(22): 211-218.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I22/211

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