Vibration signal characteristics of gear fault in resonance region

被引：0
|
作者：
Yu X.-N. [1 ]
Chen X.-W. [1 ]
Feng Z.-P. [1 ]
机构：
[1] School of Mechanical Engineering, University of Science and Technology Beijing, Beijing
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2020年 / 33卷 / 02期
关键词：
Demodulation; Fault diagnosis; Gearbox; Resonance; Time-frequency analysis;
D O I：
10.16385/j.cnki.issn.1004-4523.2020.02.023
中图分类号：
学科分类号：
摘要：
Gear fault generates impulses, and further excites resonance of the gearbox or even measurement system. Therefore, resonance region contains gear fault information, and can be explored for fault diagnosis. To this end, vibration signals in resonance region is modeled as an amplitude modulation and frequency modulation process, and fault symptoms are summarized in Fourier spectrum, and amplitude and frequency demodulated spectra are also obtained, in both constant and time-varying speed conditions. According to the independence nature of resonance frequency on running speeds, a resonance frequency identification method is proposed based on time-frequency analysis of vibration signals under time-varying speeds. This method is free from traditional modal test. To overcome the difficulty due to intricate sidebands, amplitude demodulation and frequency demodulation, analysis is proposed to identify modulating frequency, and thereby extract gear fault frequency directly. The theoretical derivations are validated through numerical simulation and lab experiments. Resonance frequency is identified, and gear fault features are extracted under both constant and time-varying speed conditions. © 2020, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.
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页码：424 / 432
页数：8
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