Feature Extraction Approach for Rotor Rub-impact Using Second Generation Wavelet Transform
Duan Chen-dong · Turbine Technology · 2006
In order to obtain fault feature that submerged in vibration signals,fault features with impact response properties are efficiently extracted by virtue of the characteristics of the second-generation wavelets following: symmetrical,compactly supported and decaying oscillation with impulsive signature.Experimental results shown that an approved effect can be achieved even if one such wavelet with less supported interval is adopted.Moreover,for the purpose of getting the same time resolution as original signal,a technique named single branch reconstruction is used to rebuild the approximation signal and the detail signal respectively.Then the time domain response features of rotor rub-impact fault are gained.It gives a new approach for separating the time domain features from vibration signal in fault diagnosis and prognosis.