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.
Key words
planetary gearbox /
generating differential equations /
amplitude envelope /
instantaneous frequency
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References
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Feng Zhipeng，Chu Fulei．Vibration spectral characteristics of distributed gear fault of planetary gearboxes [J]．Proceedings of the CSEE，2013，33(2)：118-125 (in Chinese)．
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Feng Zhipeng, Zhao Leilei, Chu Fulei．Vibration spectral characteristics of localized gear fault of planetary gearboxes [J]．Proceedings of the CSEE，2013，33(5)：119-127 (in Chinese)．
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Feng Zhipeng, Zhao Leilei, Chu Fulei．Amplitude demodulation analysis method for fault diagnosis of planetary gearboxes [J]．Proceedings of the CSEE，2013，33(8)：107-111 (in Chinese)．
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Feng Zhipeng, Chu Fulei. Frequency demodulation analysis method for fault diagnosis of planetary gearboxes [J]．Proceedings of the CSEE，2013，33(11)：112-117 (in Chinese)．
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