Detection and Extraction of Signal Transients and Their Applications in Fault Diagnosis
Zhu Zhong · 2004
The detection and extraction of transients through continuous wavelet transform are studied for gearbox fault diagnosis. The modulus local maximum theory of continuous wavelet transform is introduced for the analysis of the relation between the transform coefficients and the transients. The feature of mother wavelets and its influence on the continuous wavelet transform is presented. To extract the transients,the threshold is set in the reconstruction of signal transient feature. The proposed approaches are utilized in the detection and extraction of transient component in the gearbox vibration for fault diagnosis and the outcomes indicate that continuous wavelet transform is quite effective in detecting the existence of the transients and the extracted transients in the gearbox vibration reveal the fault of the gearbox effectively.