Local faults of a planetary gearbox are easy to develop into combined ones. Vibration spectral features of a combined fault are obviously different from those of a local one. So studying spectral structure of combined faults for sun wheel-teeth ring, sun wheel-planet one and planet wheel-teeth ring is of very importance for fault diagnosis of planetary gearbox. Here, considering the frequency-modulation and amplitude-modulation actions of combined faults to vibration signals and the amplitude-modulation of time-varying vibration transmission path, vibration signal models of combined faults were established and their Fourier spectra formulas were derived to summarize spectral feature laws of combined faults. Meanwhile, combined faults’ feature frequencies calculation formulas for sun wheel-teeth ring, sun wheel-planet one, planet wheel-teeth ring and sun wheel-planet wheel-teeth ring were deduced, respectively. The results of theoretical derivation were verified with test signal analyses of planetary gearboxes. Based on Fourier spectral analysis, combined faults of sun wheel-teeth ring, sun wheel-planet one and planet wheel-teeth ring were diagnosed.
Key words
planetary gearbox /
combined fault /
feature frequency /
Fourier spectrum
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References
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