ANALYSIS OF PRESSURE FLUCTUATION BASED ON WAVELET TRANSFORM
基于小波变换的撞击流压力波动信号分析

By means of the fractionated multi resolution analysis of the signals with wavelet transform, many problems can be solved, which can not be solved by Fourier transform. From the differences between singular points of noise and signal, and the important features of wavelet transform in highlighting the local profiles of signals both in time-frequency domains, i.e., the fact that the maximum of the noise wavelet transform reduces dramatically with the increase of the scale, the pressure fluctuation is analyzed. The results show that the wavelet transform is a good way to eliminate noise; and by the power profiles of de-noised signals, the pressure fluctuation shows a fractal construction, as revealed in the previous study.