基于HHT的管道阀门内漏声发射检测研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (23) : 62-66.

论文

基于HHT的管道阀门内漏声发射检测研究

刘贵杰1 徐萌1 王欣1 姜瑞林2

作者信息 +

STUDY ON AE DETECTION FOR PIPELINE VALVE LEAKLAGE BASED ON HHT

LIU Gui-jie1 XU Meng1 WANG Xin1 JIANG Rui-lin2

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摘要

针对管道阀门内漏声发射信号的非平稳特征，提出将总体平均经验模式分解(EEMD)和希尔伯特变换相结合的希尔伯特黄变换(HHT)方法应用于管道阀门内漏声发射检测中。利用EEMD方法将阀门内漏声发射信号自适应分解为一簇本征模态函数(IMF)，并对分解后的信号进行Hilbert谱和HHT边际谱分析，可以提取到阀门内漏声发射信号的本质特征，突破常规时频分析的非线性信号局限性以及经验模式分解(EMD)造成的模态混叠现象；相比于STFT频谱，Hilbert谱具有较高的时频分辨率，最后对信号的Hilbert边际谱分析确定了内漏信号的主要作用频率。该方法可以有效的应用于阀门内漏声发射检测中。

Abstract

To analyze the non-stationary feature of acoustic emission (AE) signal from pipeline valve leakage, we present the HHT method which is the hybrid of Ensemble Empirical Mode Decomposition (EEMD) and Hilbert transform method for AE detection. Using EEMD method, the detected leakage signal was treated with self-adaptive decomposed into a series of Intrinsic Mode Functions (IMF). Then those IMF were analyzed using the Hilbert spectrum and HHT marginal spectrum, from which, the key characteristics of AE signal in valve leakage can be extracted. The HHT method can overcome limitations of nonlinear signal in time-frequency analysis, and can avoid the mode mixing caused by EMD method.We verified that the Hilbert spectrum has higher time-frequency resolutions compare to those from STFT spectrum, By analyzing the hilbert marginal spectrum, we also identified the main function frequency of signal leakage. This research showed that HHT method can be successfully applied in acoustic emission testing of valve leakage.

导出引用

刘贵杰徐萌王欣姜瑞林. 基于HHT的管道阀门内漏声发射检测研究[J]. 振动与冲击, 2012, 31(23): 62-66

LIU Gui-jie XU Meng WANG Xin JIANG Rui-lin. STUDY ON AE DETECTION FOR PIPELINE VALVE LEAKLAGE BASED ON HHT[J]. Journal of Vibration and Shock, 2012, 31(23): 62-66