Abstract：The vibration signal of a planetary gearbox has clear characteristics of modulation and analysis of frequency demodulation and amplitude demodulation plays a vital role in the fault diagnosis. Though the generating differential equation (GDE) method can estimate the amplitude envelope and the instantaneous frequency of the modulation signal,it only suits to single component composition. Actually,vibration signal of a planetary gearbox is composed of complex component composition. In order to analyze amplitude envelope and instantaneous frequency of a modulation signal,in this paper,we decomposed a modulation signal into the single component intrinsic mode function (IMF) by the empirical mode decomposition (EMD). According to the fluctuation characteristics of instantaneous frequency which result from the generating differential equation,the IMF as the sensitive component was chosen. The characteristic frequency of localized fault was identified with Fourier frequency spectrum of amplitude envelope and instantaneous frequency. Its effectiveness in extracting the characteristic frequency of localized fault was validated by the demodulation analysis of experiments of the planetary gearbox.
李康强，冯志鹏. 基于生成微分方程的行星齿轮箱故障振动信号解调分析[J]. 振动与冲击, 2017, 36(8): 9-15.
LI Kangqiang,FENG Zhipeng. Signal demodulation via the generating differential equation method for planetary gearbox fault diagnosis. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(8): 9-15.
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