摘要
在角接触球轴承沟道磨削加工过程中,为了对其表面谐波源问题进行辨识,提出了一种基于小波分解和重构与功率谱密度法(PSD)、相关性分析的频谱分析方法。首先,采用表面轮廓仪采集了磨削试验中的7006C球轴承内沟的实际截面轮廓信息,再用小波分解的“db5”小波基对其进行了5层分解,并根据圆度误差、波纹度和表面粗糙度的分界指标,将经过小波分解后得到的5层信号重构为低频、中频和高频信号;然后,采用功率谱密度法(PSD)分析了重构信号的各频段信号,并对主要谐波源频率特性进行了辨识;最后,提取了其误差源频率,分析了误差源与加工表面谐波的关联度。研究结果表明:相比于电机转子不平衡、油膜半速涡动和电磁无心夹具调整不当等因素,在磨削试验加工的7006C内沟表面,由砂轮主轴振动导致的谐波占比大;该方法可以作为寻找角接触球轴承沟道磨削表面谐波源和比较谐波源关联度原有方法的一种补充。
In order to identify the harmonic source of grinding surface of angular contact ball bearing raceway,a spectrum analysis method based on wavelet decomposition and reconstruction was proposed,which was combined with the power spectral density(PSD)and correlation analysis.Firstly,the actual profile information of 7006C inner raceway in grinding test was collected by using surface profilometer based on wavelet decomposition and decomposed into 5 layers using“db5”wavelet basis,according to the roundness error,waviness and surface roughness demarcation index,the 5 layers of decomposition signals were reconstructed into low,medium and high frequency signals.Then,the reconstructed frequency bands were analyzed by the Power Spectral Density method(PSD),and the frequency characteristics of the main harmonic sources were identified.Finally,the frequency of error source was extracted,and the correlation between error source and machined surface harmonic was analyzed.The results show that,comparing with the unbalance of the motor rotor,the half-speed vortex of the oil film and the improper adjustment of the electromagnetic centerless fixture,the vibration of the grinding wheel spindle account for a larger proportion of the surface harmonics of the 7006C inner raceway processed by the grinding test.This method can be used as a supplement to the method of finding harmonic sources and comparing the correlation degree of harmonic sources in raceway grinding of angular contact ball bearings.
作者
王毅鹏
薛进学
赵国强
吕宽宽
WANG Yi-peng;XUE Jin-xue;ZHAO Guo-qiang;LV Kuan-kuan(School of Mechatronics Engineering,Henan University of Science and Technology,Luoyang 471039,China)
出处
《机电工程》
CAS
北大核心
2022年第3期382-387,共6页
Journal of Mechanical & Electrical Engineering
基金
国家重点研发计划资助项目(2018YFB2000502)。
关键词
角接触球轴承
轴承沟道
沟道磨削
表面谐波
小波分析
功率谱密度
angular contact ball bearings
bearing raceway
raceway grinding
surface harmonic
wavelet analysis
power spectral density(PSD)
