基于阶次分析技术的行星齿轮箱非平稳振动信号分析

Fault diagnosis of a planetary gearbox based on order tracking

行星齿轮箱启动、停止和负载发生变化时,转速会发生变化并使得行星齿轮箱的振动信号具有明显的非平稳特性。行星齿轮箱复杂的结构特征导致了振动信号的复杂性,使得常规的频谱和解调分析方法难以识别时变工况下的行星齿轮箱故障特征频率。在行星齿轮箱故障特征频率的基础上,考虑转速变化特征,总结了行星齿轮箱太阳轮、行星轮及齿圈的故障阶次特征表。通过对行星齿轮箱变转速工况下太阳轮故障实验信号的阶次分析,实现了变转速情况下行星齿轮箱太阳轮故障诊断,并与传统的频域信号分析方法比较,体现了阶次分析技术在行星齿轮箱变工况故障诊断过程中的优势。

Planetary gearboxes starting,stoping and their load changes may cause variations of their rotational speed and their vibration signals with obvious non-stationarity. The vibration signals of a planetary gearbox are complex due to the complexity of its structure. The non-stationary vibration signals and their complex characteristics bring tremendous difficulties for a planetary gear box＇s fault diagnosis. Here,the order tracking method was introduced into the planetary sun gear fault detection under speed variation conditions,the fault characteristic orders of a speed-varying planetary gearbox were summarized. Comparing the traditional frequency domain methods with the order tracking method was made experimentally. The results showed that the order tracking method is effective for fault diagnosis of a planetary gearbox under speed-varying conditions.