摘要
绝对式磁编码器具有价格低、安装方便等优势,适合于工程应用,但在低转速工况下其角度信号受测量误差的影响较大,需要对角度信号进行拟合以消除测量误差带来的干扰。传统的分段拟合方法在分段点处易出现不连续现象,角度信号的不连续导致由其计算的瞬时角速度(instantaneous angular speed,简称IAS)信号中出现虚假冲击,并对基于IAS信号的故障特征提取造成干扰。针对此问题,提出一种基于绝对式磁编码器IAS估计和窄带解调的太阳轮故障检测方法。首先,为保证IAS信号的连续性与平滑性,提出基于最小二乘拟合与5次Hermite插值的方法,实现了对IAS信号的拟合估计和平滑处理;其次,结合窄带解调技术实现了对行星齿轮减速器太阳轮故障特征的有效提取;最后,通过对正常与故障太阳轮的绝对式磁编码器信号分析对比,验证了所提方法的有效性。
Instantaneous angular speed(IAS)-based planetary transmission fault detection can effectively overcome the transmission path problem existing in the traditional vibration signal-based analysis method,which has attracted much attention.Conversely,the absolute magnetic encoder has the advantages of low price and convenient installation,which is suitable for engineering application,however,its angle signal is significantly affected by measurement error under low speed conditions,so it is necessary to simulate the angle signal so as to eliminate the interference caused by measurement error.The traditional segment fitting method tends to result in discontinuity at the segment point.Such discontinuity leads to false impacts in the IAS signal calculated by it,interfering with the fault feature extraction based on the IAS signal.In this paper,a sun gear fault detection method based on IAS estimation and narrowband demodulation of absolute magnetic encoder is proposed.Firstly,in order to ensure the continuity and smoothness of IAS signal,a method based on least square fitting and five times Hermite interpolation is proposed to realize the fitting estimation and smoothing of the IAS signal.Secondly,building on this foundation and in conjunction with narrowband demodulation technology,the fault characteristics of the sun gear in the planetary gear reducer are effectively extracted.Finally,the effectiveness of the proposed method is verified by analyzing and comparing the signals from the absolute magnetic encoder of both normal and faulty sun gears.
作者
尹兴超
郭瑜
李震焘
华健翔
YIN Xingchao;GUO Yu;LI Zhentao;HUA Jianxiang(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology Kunming,650500,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2024年第2期365-371,414,共8页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(52165067)
云南省重点领域科技计划资助项目(202002AC080001)。
关键词
磁编码器
行星齿轮箱
瞬时角速度信号
窄带解调
角域同步平均
magnetic encoder
planetary gearbox
instantaneous angular speed signal
narrow band demodulation
rotation domain averaging
