改进TFCA方法的滚动轴承故障AE信号特征提取  

Feature extraction of AE signal for rolling bearing fault by improved TFCA method

作　　者：于洋[1] 李赟 杨平[1] 唐金 赵鑫 梁哲铭 YU Yang;LI Yun;YANG Ping;TANG Jin;ZHAO Xin;LIANG Zheming(School of Information Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Hunan Aviation Powerplant Research Institute,Aero Engine Corporation of China,Zhuzhou Hunan 412002,China;Shenyang Aircraft Design and Research Institute,Aviation Industry Corporation of China,Limited,Shenyang 110035,China)

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110870 [2]中国航发湖南动力机械研究所,湖南株洲412002 [3]中国航空工业集团有限公司沈阳飞机设计研究所,沈阳110035

出　　处：《航空动力学报》2024年第12期409-418,共10页Journal of Aerospace Power

基　　金：中国航空发动机集团应用创新项目(630010504);辽宁省教育厅重点攻关项目(LZGD2019005)。

摘　　要：针对时频相干方法(time-frequency coherence analysis,TFCA)不能分析单通道信号的问题,提出了一种新的时频相干方法,通过平均估计算子实现对单通道信号分析。利用软岛全息声发射系统和旋转机械模拟平台进行了滚动轴承内圈、外圈故障声发射(acoustic emission,AE)检测,研究了低信噪比条件下滚动轴承故障特征周期提取。将所提方法与传统时频相干、短时傅里叶变换、小波相干方法进行对比研究,并进行实验验证。仿真和实验结果表明:所提方法明显优于其他时频方法,时频聚集性高、抗噪性能强,并能准确提取轴承故障周期特征。In order to solve the problem of traditional time-frequency coherence analysis(TFCA)method's failure to analyze the single-channel signal,a new time-frequency coherence method was proposed.The new method can analyze the single-channel signal through the average estimation operator.The soft-land full-information acoustic emission(AE)system and the rotating machinery simulation platform were used to detect the inner ring and outer ring faults of the rolling bearing.The study focused on the extraction of fault characteristic periods of rolling bearings under conditions of low signal-to-noise ratio.The proposed method was compared with the traditional time-frequency coherence,short-time Fourier transform,wavelet coherence methods,and was verified experimentally.The simulated and experimental results showed that the proposed method is superior to other time-frequency methods.The proposed method can accurately extract the period characteristics of fault signal,and exhibit high timefrequency aggregation and strong anti-noise performance.

关 键 词：声发射 时频相干 低信噪比 滚动轴承 单通道 

分 类 号：V263.6[航空宇航科学与技术—航空宇航制造工程] TH133.33[机械工程—机械制造及自动化]