柔性椭圆轴承故障频率分析与CMWT-FH特征提取

doi:10.3901/JME.2019.23.154

机械工程学报 ›› 2019, Vol. 55 ›› Issue (23): 154-161.doi: 10.3901/JME.2019.23.154

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柔性椭圆轴承故障频率分析与CMWT-FH特征提取

郭莹莹, 赵学智, 上官文斌, 李伟光

华南理工大学机械与汽车工程学院广州 510641

收稿日期:2018-11-20 修回日期:2019-08-29 出版日期:2019-12-05 发布日期:2020-02-18
通讯作者: 上官文斌(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为振动噪声分析与控制、隔振减振方法。E-mail:sgwb@163.com
作者简介:郭莹莹,女,1990年出生,博士研究生。主要研究方向为机械设备故障诊断。E-mail:839044192@qq.com
基金资助:
广东省自然科学基金（2019A1515011780）、国家自然科学基金（51875216）和国家高技术研究发展计划（863计划，2015AA043005）资助项目。

Fault Frequency Analysis and Feature Extraction Based on CMWT-FH of Elliptically Shaped Bearing

GUO Yingying, ZHAO Xuezhi, SHANGGUAN Wenbin, LI Weiguang

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641

Received:2018-11-20 Revised:2019-08-29 Online:2019-12-05 Published:2020-02-18

摘要/Abstract

摘要： 柔性椭圆轴承（Elliptically shaped baring，ESB）在工作中承受循环交变应力载荷，是谐波减速器中最易损坏的核心零件。根据ESB的运动学特性，推导其滚道表面发生局部缺陷故障时的特征频率公式。由于其故障特征容易被长短轴交替产生的振动激励信号所掩盖，提出连续Morlet小波变换（Continuous Morlet wavelet transform，CMWT）与基于FFT的Hilbert频谱分析（FFT based Hilbert，FH）结合的CMWT-FH故障特征提取方法。与普通FH方法的特征提取效果对比分析，CMWT-FH方法可以更容易、更准确地识别出ESB的故障特征频率及其边频带频率：外圈故障时，外圈故障特征频率及其高次倍频两侧存在间隔为二倍转频调制频率的边频带；内圈故障时，内圈故障特征频率及其高次倍频两侧存在间隔为转频调制频率的边频带。可结合故障特征频率及调制边频带来判断故障出现在外圈还是内圈。

关键词: 柔性椭圆轴承, 故障频率, CMWT-FH, 特征提取

Abstract: Elliptically shaped bearing (ESB) is the most easily damaged core component of harmonic drive under cyclic load of alternating stress. In order to diagnose the fault on raceway surface of ESB, the formulas of fault feature frequency is derived by using the kinematics equations of ESB. Considering the effect of characteristic excitation of vibration produced by alternating between long axis and short axis, the fault features of ESB are easily concealed. A method called CMWT-FH which is based on continuous Morlet wavelet transform and FFT-based Hilbert spectrum analysis is proposed for fault feature extraction. Compared with the conventional FFT-based Hilbert method, the proposed CMWT-FH method can identify fault feature frequency and its sideband of ESB more easily and accurately. It is shown that, the fault feature frequency of the ESB outer-race and its harmonics are surrounded by sidebands with a spacing equal to the modulating frequency of rotation frequency. The fault feature frequency of the ESB inner-race and its harmonics are surrounded by sidebands with a spacing equal to the modulating frequency of second-order rotation frequency.

Key words: elliptically shaped bearing, fault frequency, CMWT-FH, feature extraction

中图分类号:

TN165
TN911

郭莹莹, 赵学智, 上官文斌, 李伟光. 柔性椭圆轴承故障频率分析与CMWT-FH特征提取[J]. 机械工程学报, 2019, 55(23): 154-161.

GUO Yingying, ZHAO Xuezhi, SHANGGUAN Wenbin, LI Weiguang. Fault Frequency Analysis and Feature Extraction Based on CMWT-FH of Elliptically Shaped Bearing[J]. Journal of Mechanical Engineering, 2019, 55(23): 154-161.

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柔性椭圆轴承故障频率分析与CMWT-FH特征提取

Fault Frequency Analysis and Feature Extraction Based on CMWT-FH of Elliptically Shaped Bearing

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