Fault detection of a planetary gearbox based on improved sideband filtering and reconstructed spectral correlation

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (24) : 205-210.

CAI Xianyang,GUO Yu,WU Xing,ZHOU Jun

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Abstract

Aiming at the fault detection of gear tooth crack in a planetary gearbox under the influence of noise and complex modulation interference, a fault extraction method based on improved sideband filtering and reconstructed spectral correlation density was proposed.Firstly, the vibration separation technology was applied to the vibration of the planetary gearbox to synthesize the gear vibration which has eliminated the influence of time-varying transmission path; After improving the sideband filtering, slide sideband filtering was performed on the vibration in the frequency domain, the filtered signals of each frequency band were converted into the time domain by the inverse Fourier transform and the spectral correlation density was calculated.Finally, the spectral correlation density of signal in each frequency band was accumulated to obtain the reconstructed spectral correlation density of the gear vibration and thereby detect the root crack failure.The experimental results of the planetary gearbox with tooth root crack under normal conditions, faulty planetary gear and faulty sun gear show that the method can detect the characteristics of faulty planetary and sun gears effectively.

Key words

planetary gearbox / spectral correlation density / sideband filtering / tooth root crack / vibration separation

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CAI Xianyang,GUO Yu,WU Xing,ZHOU Jun. Fault detection of a planetary gearbox based on improved sideband filtering and reconstructed spectral correlation[J]. Journal of Vibration and Shock, 2020, 39(24): 205-210

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