Separation of Background Periodic Impact of Flexible Thin-wall Bearing Based on Improved Harmonic Wavelet Packet

doi:10.3901/JME.2022.22.148

Abstract

Abstract: Flexible thin-wall bearing(FTB) is a special bearing, the inner and outer rings of which are ellipses. During the rotation process, the long and short axes of ellipse will cause the periodic impact on the bearing, and this kind of impact is mixed with the fault periodic impact caused by the injured elements of FTB and is a great interference to the fault periodic impact. In order to eliminate this impact interference, the characteristics of this periodic impact are analyzed, and based on the box frequency characteristic of harmonic wavelet, an improved harmonic wavelet packet is proposed to separate this periodic impact. For the ordinary harmonic wavelet packet, the frequency range of each sub-band is determined by the number of decomposition layers, while for the improved harmonic wavelet packet, the frequency range of each sub-band is designed based on the frequency distribution characteristic of the periodic impact caused by the long and short axes of ellipse, and each harmonic component of this impact can be effectively extracted,so that the whole background periodic impact can be accurately separated. The processing results of vibration signals of the actual FTBs show that the improved harmonic wavelet packet accurately removes the background periodic impact from the complexly mixed periodic impact, while the fault periodic impact is well retained, thus the interference of background periodic impact is eliminated, and the damage of the FTBs is correctly identified.

Key words: flexible thin-wall bearing, background periodic impact, improved harmonic wavelet packet, impact separation, fault identification

CLC Number:

TN911
TP277

ZHAO Xue-zhi, YE Bang-yan, CHEN Tong-jian. Separation of Background Periodic Impact of Flexible Thin-wall Bearing Based on Improved Harmonic Wavelet Packet[J]. Journal of Mechanical Engineering, 2022, 58(22): 148-159.

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