自振射流喷嘴腔内压力信号分析方法的研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (17) : 180-184.

论文

自振射流喷嘴腔内压力信号分析方法的研究

徐平平1，2，柳靖1，马飞1，汪晖1，蔡腾飞1，马琳1

作者信息 +

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

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

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文章历史 +

摘要

喷嘴腔内流体的压力脉动与自振射流的特性密切相关，获取腔内压力信号并分析其构成对自振射流产生机理的研究具有重要意义。本文分别应用小波分析和希尔伯特-黄变换(HHT)对实测的腔内压力脉动信号进行了对比分析，讨论了两种方法在压力信号提取和时频分析的适用性。结果表明：两种方法都能对腔内信号进行分解与重构，并能很好地提取信号的主要特征信息；HHT不存在基函数的预先选择，且经验模式分解(EMD)得到的本征模函数(IMF)分量能反映原始信号的固有特性，具有实际的物理意义；HHT可得到信号的瞬时频率，更有利于对腔内的脉动信号进行实时地观测。相比于小波分析，HHT更适于自振射流压力脉动信号的分析与处理。

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.

导出引用

徐平平1，2，柳靖1，马飞1，汪晖1，蔡腾飞1，马琳1. 自振射流喷嘴腔内压力信号分析方法的研究[J]. 振动与冲击, 2015, 34(17): 180-184

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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