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The combined wavelet packet and fuzzy pattern recognition method was used to diagnose the gear faults. Firstly, we use wavelet packet db3 (Daubechies3) by level 4 to decompose and analyze the measured vibration signals from a test gearbox. Secondly, the energy of wavelet packet coefficients was calculated as the characteristic values, by means of which the target fuzzy samples and testing fuzzy samples...
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