Application of wavelet analysis to vibration signal processing for high dam plunge pool
Fang Liu · Journal of Hydroelectric Engineering · 2013
Wavelet analysis is a localized time-frequency analysis method,and it uses a combination of time domain and frequency domain to show the characteristics of a signal.This paper applies this method to decomposition of vibration signals into different frequency bands.We Abstracted the energy of signal in different frequency bands and the vibration characteristics of plunge pool slabs by decomposing the signal into different frequencies and different scales.According to the signal noise sigma,we have achieved wavelet threshold noise reduction of the signal by using a general threshold,a threshold set by Birge-Massart strategy,a threshold set by penalty strategy,and a strategy of the threshold for estimation of sample signal,and finally obtained the best scheme.