基于HEI量化故障信息的行星齿轮箱故障诊断方法研究

Planetary gearbox fault diagnosis method based on harmoniceffective index quantitative fault information

针对复杂工况下行星齿轮箱的故障信息难以量化衡量的问题,提出了基于谐波有效指数(HEI)量化故障信息的行星齿轮箱故障诊断方法。首先,对信号进行分析处理,对频率切片小波变换(FSWT)频率切片后的频带信号进行了精细复合多尺度散布熵(RCMDE)值计算,选取故障特征多的频带进行了信号重构,使用多点最优调整的最小熵解卷积(MOMEDA)对重构信号中的故障冲击成分进行了准确提取;通过建立谐波有效指数,量化了包含在振动信号中的故障信息,实现了对行星齿轮箱的故障诊断;最后,使用行星齿轮箱齿面磨损故障的试验数据进行了相关的验证。研究结果表明:该方法能够实现行星齿轮箱振动信号中故障特征的提取;从处理后信号的频谱中可以清楚地观察到行星轮故障特征频率f p=7.03 Hz及其倍频nf p;实验数据中的HEI值为3.47×10-6,可以作为衡量行星齿轮箱故障程度的有效指标。

Aiming at the problem that the fault information of the planetary gearbox was difficult to quantified and measured under the complicated working conditions,a fault diagnosis method of the planetary gearbox based on the harmonic effective index(HEI)to quantify the fault information was proposed.Firstly,the signal is analysed and processed,the RCMDE value of FSWT frequency sliced signal was calculated,the frequency band with more fault features was selected for signal reconstruction;MOMEDA was used to extract the fault impulse component of the reconstructed signal accurately.Then the fault information contained in the vibration signal was quantified by establishing the harmonic effective index(HEI),the fault diagnosis of planetary gearbox was realized.And the test data of the planetary gearbox tooth surface wear failure was used for verification.The research results show that the method can extract the fault characteristics in the vibration signal of the planetary gearbox;the planetary gear fault characteristic frequency f p=7.03 Hz and its multiplication frequency nf p can be clearly observed in the frequency spectrum of the processed signal.The HEI value of f p in the experimental data is 3.47×10-6 which can be used as an effective index to measure the degree of failure of the planetary gearbox.