Aero-Engine Vibration Fault Diagnosis Based on Harmonic Wavelet

Abstract

Because of the complicated structure of rollers, it is very difficult to diagnosis aero-engine vibration fault. Harmonic wavelet method is proposed target towards whole-body vibration of aero-engine in this paper. To implement vibration fault diagnosis of Aero-engine, vibration signals are presented with time-frequency and spectrum of coefficients after harmonic wavelet transform. The designed method overcome noise disturbance and energy leakage and possesses better performance for aero-engine vibration analysis compared with traditional wavelet analysis method. With the vibration data from whole-body vibration experiment, the effectiveness of the designed method is illustrated and it could identify three classical vibration faulty modes accurately, which provides a better method for whole-body vibration fault diagnosis of Aero-engine.