基于包络加窗同步平均的行星齿轮箱特征提取

行星齿轮箱由于行星轮通过效应、太阳轮与行星架的旋转及时变工况,导致其振动响应存在时变传递路径及非平稳性等特点,且传统的同步平均将不能直接应用于行星齿轮箱。笔者在国外加窗同步平均的基础上提出一种能有效克服时变传递路径及非平稳性的基于包络信号角域加窗同步平均的行星齿轮箱故障特征提取方法。首先,基于谱峭度提取出行星齿轮箱振动信号的包络信号;其次,再利用计算阶比跟踪技术对包络信号进行等角度重采样,行星架每旋转一圈,选择合适的窗函数对角域信号进行多齿宽加窗截取;最后,验证齿轮啮合齿序特征,根据重排齿序对加窗信号进行重构振动分离信号,对振动分离信号进行角域同步平均,提取行星齿轮箱故障特征。行星齿轮箱故障实测信号分析表明,该方法能有效提取行星齿轮箱故障特征。

Fault Feature Extraction of Planetary Gearboxes Based on Angle Domain Windowed Synchronous Average of the Envelope Signal

The vibration response of a planetary gearbox has a time-varying and non-stationarity due to the effect of planet gear passing, the rotation of sun gear and a planet carrier, and other time varying conditions. However, the traditional synchronous average cannot be directly applied to the planetary gearboxes. In the light of such problem, this paper proposes a fault feature extraction method based on foreign windowed synchronous ave raging, which is based on angle domain windowed synchronous average of envelope signal to overcome the ime-varying transmission path and non-stationarity . This method using spectral kurtosis to extract the envelope signal of the vibration signal of the planetary gearbox; Then, the enveloping signals are resampled by the calculation order tracking technique. The rotation of each carrier, the appropriate window function and window width are selected for windowed interception of angle domain signals. Finally, the gear meshing tooth sequence feature is verified, and the vibration separation signal is reconstructed by windowed signals according to rearranging tooth sequence, extraction of gear fault characteristicsby angle domain synchronous average of vibration separation signals. Fault analysis of planetary gearboxes measured signal shows that the method can effectively extract the planet gearbox fault characteristics.