基于声发射的真空泄漏在线检测技术研究

张 涛;曾周末;李一博;孟冬辉;王伟魁;边旭;綦磊;靳世久

振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 164-168.

PDF(1186 KB)
PDF(1186 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 164-168.
论文

基于声发射的真空泄漏在线检测技术研究

  • 张 涛1,曾周末1,李一博1,孟冬辉2,王伟魁1,边旭1,綦磊2,靳世久1
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Vacuum leak detection based on acoustic emission method

  • ZHANG Tao,ZENG Zhou-mo,LI Yi-bo,MENG Dong-hui,WANG Wei-kui,BIAN Xu,QI Lei,JIN Shi-jiu
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摘要

真空泄漏是气体动力系统运行过程中的常见故障,传统的氦质谱检漏无法实现对真空泄漏的在线检测。本文利用声发射技术阐述了基于声发射信号的真空泄漏在线检测原理,通过真空泄漏声发射检测模拟试验,并利用参数特征分析法和平均频谱分析法对不同泄漏孔径下产生的声发射信号的特征进行了研究,得到了相应的小波包归一化频带能量分布特征。研究结果表明,真空泵运行的平均时域信号频带在20kHz以下,气体泄漏激发出大量的高频声发射信号,泄漏信号参数特征值与泄漏孔径的大小密切相关,泄漏信号的归一化能量分布一致性较好。声发射技术对于真空泄漏的在线检测及泄漏量评价等有实际意义。

Abstract

Vacuum leak is a common fault in the gas power systems and helium mass spectrum is the conventional leak detection method. However, the method cannot be carried out on line and the leak could not be identified expeditiously. Acoustic emission technology is an advanced on-line non-destructive testing method. In this article, acoustic emission signal generation mechanism of vacuum leakage is illustrated, and vacuum-leak-experiments were investigated based on acoustic emission characteristic-analysis. Normalized wavelet packet band energy distribution characteristics of different leakage aperture were analyzed. The results indicate that the average time-domain waveform of the operating vacuum pump is mainly below 20 kHz; a number of high-frequency acoustic signals were inspired with the vacuum leakage; the leakage signal parameters is closely related to the leakage aperture; the normalized energy distributions of leakage acoustic emission signals are in good agreement. Acoustic emission technique is of highly practical significance for online vacuum leak detection and leakage rate evaluation.


关键词

真空泄漏 / 声发射 / 平均频谱 / 泄漏孔径 / 频带能量

Key words

Vacuum leak / Acoustic emission / average frequency spectrum / Leakage aperture / Band power

引用本文

导出引用
张 涛;曾周末;李一博;孟冬辉;王伟魁;边旭;綦磊;靳世久. 基于声发射的真空泄漏在线检测技术研究[J]. 振动与冲击, 2013, 32(24): 164-168
ZHANG Tao;ZENG Zhou-mo;LI Yi-bo;MENG Dong-hui;WANG Wei-kui;BIAN Xu;QI Lei;JIN Shi-jiu. Vacuum leak detection based on acoustic emission method[J]. Journal of Vibration and Shock, 2013, 32(24): 164-168

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