基于振动分离信号构建和同步平均的行星齿轮箱轮齿裂纹故障特征提取

Fault feature extraction of gear tooth crack of planetary gear-box based on constructing vibration separation signals and synchronous average

行星齿轮箱由于行星轮的行星运动导致其振动传递路径存在时变性,其振动响应与常规定轴齿轮箱振动响应有着本质的区别,传统的同步平均并不能直接应用于行星齿轮箱。为解决该问题,国外发展了可有效克服行星齿轮箱变传递路径的加窗同步平均法,详细论述了基于振动分离信号构建和同步平均的行星齿轮箱轮齿裂纹故障特征提取的原理及其实现。该方法首先验证齿轮的啮合齿序特征,根据齿序特征选择合适的窗函数对信号进行加窗截取,再根据重排齿序和加窗截取信号构建目标齿轮振动信号,最后对振动分离信号进行同步平均。行星齿轮箱齿根裂纹故障实测信号分析表明,该方法能有效的对行星齿轮箱进行故障特征提取。

Planet gear’s planetary motion causes time-varying vibration transmission path in a planetary gear box,its vibration responses are essentially different from those of conventional fixed-axis gearboxes,the traditional synchronous average method can’t be directly applied in a planetary gear-box.In order to solve this problem,the windowed synchronous averaging method developed abroad can effectively overcome the variable transmission path of planetary gear-box vibration.Here,the principle and realization for fault feature extraction of gear tooth crack of planetary gear-box were presented in detail based on constructing vibration separation signals and synchronous average.With this method,the characteristic of gear’s mesh tooth sequence was verified firstly.According to the characteristic of tooth sequence,the appropriate window function was selected to perform window interception of signals.Then the target gear’s vibration signals were constructed according to the rearranged gear tooth sequence and window intercepted signals.Finally,the synchronous average of vibration separation signals was done.The analysis for the actual measured signals of tooth root crack of a planetary gear-box showed that the presented method can be used to effectively extract fault features of a planetary gear-box.