Research on Acoustic Emission Detection Mechanism of Axle Box Bearing State of EMU

被引：0
|
作者：
Li D. [1 ]
Qi H. [1 ]
Hou D. [1 ]
Kong F. [1 ]
Hong M. [1 ]
Han D. [1 ]
机构：
[1] School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University, Beijing
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2021年 / 57卷 / 12期
关键词：
Acoustic emission; Axle box bearing; Detection mechanism; Rough surface;
D O I：
10.3901/JME.2021.12.153
中图分类号：
学科分类号：
摘要：
Acoustic emission(AE) technology can be used for condition monitoring and fault diagnosis of axle box bearings of electric multiple units(EMU) because of its high-frequency and high-sensitivity sensing capabilities. However, there is still a lack of mechanism research between bearing status and acoustic emission signals. In this paper, a contact model for the rough surface of the bearing was developed by applying Hertz contact theory based on the assumption of a random distribution of asperities, with the axle box bearings of EMU as the object of study; the elasticity theory is used to carry out the elastic deformation analysis of the bearing interference asperity under load; combined with the elastohydrodynamic theory, and the rough contact surface deformation energy equation between the rolling element and the inner and outer rings was established under lubrication conditions; the relationship between the deformation energy of bearing and the root mean square is obtained by analyzing the elastic wave characteristics of AE signal in contact state of bearing, which is the mechanism of AE detection. Taking the outer ring failure of a typical double-row tapered roller bearing as a research example, the comparison between theoretical analysis and experimental results verifies the correctness of the mechanism analysis and provides theoretical support for the application of acoustic emission sensing in bearing state detection. © 2021 Journal of Mechanical Engineering.
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页码：153 / 160
页数：7
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