Abstract
Because of the limitation of Fast Fourier Transform(FFT) for the methed of traditional spectrum analysis to analyze the unsteady signal, wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source. It proved that the wavelet is a most powerful tool for processing the unsteady signal.
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