Abstract: A model of vortex signal in the state of pulsing flow is studied, and a new frequency measuring technique is proposed.Wavelet transform based on ⅡR filter banks is used to decompose vortex signals.A recursive wavelet algorithm using ⅡR filter banks is adopted to meet the requirement of real-time processing. The decomposed vortex signal is processed with Hilbert transform, and the instantaneous frequency (IF) is then estimated.Simulation results show that the proposed method provides satisfactory accuracy and real-time characteristic, therefore can be used to effectively process vortex signals in pulsing flow.

Key words: vortex signal, pulsing flow, filter bank, instantaneous frequency, recursive wavelet algorithm