Gear fault diagnosis of wind turbine based on discrete wavelet transform

The feature-frequency technique based on discrete wavelet transform (DWT) is proposed to diagnose the gear faults of wind turbine. Discrete wavelet decomposition to the vibration acceleration signal, combined with the analysis of energy distribution in different frequency band, is applied to determine the characteristic frequency band of the fault, and then the type of fault is determined by the frequency spectrum of the reconstructed signal on the characteristic frequency band. Large simulation experiments show that the featurefrequency technique based on DWT can effectively extract the characteristics of the gear faults of wind turbine and then accurately determine the type of fault.