Analysis Methods of Flow Pressure Signal in Oscillation Cavity of a Self-resonating Jet Nozzle

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (17) : 180-184.

Xu Pingping1,2, Liu Jing1, Ma Fei1, Wang Hui1，CAI Teng fei1，Ma Lin1

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Abstract

Flow pressure pulsation in nozzle’s oscillation cavity is closely related to the characteristics of self-resonating jet. Component analysis of the pressure signal plays an essential role to comprehend generation of self-resonating jet. The pressure pulsation signal was compared and analyzed with wavelet analysis and Hilbert-Huang transform(HHT) in this paper. The applicability of two methods in pressure signal extraction and time-frequency analysis were discussed. Experimental results showed both of the two methods could be used in decomposition and reconstruction for signal in the cavity. The main feature information could be extracted well. There is no need to select the basic function in HHT. The inherent characteristic of original signal could be reflected in Intrinsic Mode Function(IMF) obtained from Empirical Mode Decomposition(EMD). HHT has practical significance. The instantaneous frequency of signal could be got from HHT. That was beneficial to the real-time observation for pulsation signal in cavity. Compared with wavelet analysis, HHT is more suitable for the analysis of pressure pulsation signal in oscillation cavity of self-resonating jet nozzles.

Key words

self-resonating jet / pressure pulsation / signal analysis / Hilbert-Huang transform / wavelet analysis

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Xu Pingping1,2, Liu Jing1, Ma Fei1, Wang Hui1，CAI Teng fei1，Ma Lin1. Analysis Methods of Flow Pressure Signal in Oscillation Cavity of a Self-resonating Jet Nozzle[J]. Journal of Vibration and Shock, 2015, 34(17): 180-184

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