| Citation: | HUA Jianxiang, GUO Yu, CHEN Xin, et al. Tooth root crack fault detection of planetary transmission based on local synchronous fitting and narrowband demodulation[J]. Journal of Aerospace Power, 2023, 38（12）：3000-3008 doi: 10.13224/j.cnki.jasp.20220012
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In order to realize the fault detection of planetary transmission gear under the condition of less rotation cycles, a fault detection method for tooth root crack of planetary transmission based on local synchronous fitting and narrowband demodulation was presented. Firstly, the angular domain resampling of the vibration signal was carried out, and then the local synchronous fitting was used to estimate the deterministic component; according to the maximum meshing harmonic energy ratio criterion proposed in the research, the filter order frequency band with the most abundant gear fault information was selected automatically and demodulated; finally, the gear fault characteristics were revealed by amplitude demodulation and phase demodulation. The experimental and comparative results showed that this method can effectively detect the periodic amplitude and phase mutation caused by the root crack, and the amount of data required was less than the traditional windowed synchronous average method. The root crack fault detection under the condition of few revolutions had certain advantages.
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