Study on the analytic methods of non-stationary vibration signals of mechanical and electrical system
Baojie Xu · 2004
In order to select a proper method of the signal's analysis in the fault diagnosis and trend prediction of mechanical and electrical system under non-stationary states, three methods, effective in the analysis of non-stationary signals, are studied. They are short-time Fourier transformation, Wavelet Analysis and Hilbert-Huang transformation. Through the comparison of the analytic results of a simulated typical signal, the validity and characteristic of each method are confirmed, and the causes of differences are analyzed. Furthermore, the suitable application situation for each method are discussed.