Application Of Hilbert-Huang Transform In Non-Stationary Signal Analysis

Hilbert-Huang Transform proposed by scientist Huang in 1998 is a new time-frequency signal analysis method. This paper studies the practical applications of this method in analyzing non-stationary signal and completes the following tasks. 1) through analyzing a variety of typical simulating signal by HHT method and compared with the other typical time-frequency analysis methods such as the short-time Fourier transform, wavelet transform we discuss the applicability of the HHT method; 2) Aiming to restrain the endpoint "flying swing", a cycle or symmetric extension methods is adopted here; 3) Propose energy comparison improved method to identify the illusive component due to HHT; 4)Apply the improved HHT method to analyze several types of engineering measured non-stationary signals (such as mechanical equipment vibration signals, wind speed signals etc) , extracts the characteristic information of the signal, and satisfactory results are obtained.