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首页> 外文期刊>Journal of loss prevention in the process industries >Experimental study on leak detection and location for gas pipeline based on acoustic method
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Experimental study on leak detection and location for gas pipeline based on acoustic method

机译：基于声学方法的输气管道泄漏检测与定位实验研究

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摘要

The leak of gas pipelines can be detected and located by the acoustic method. The technologies of recognizing and extracting wave characteristics are summarized in details in this paper, which is to distinguish leaking and disturbing signals from time and frequency domain. A high-pressure and long distance leak test loop is designed and established by similarity analysis with field transmission pipelines. The acoustic signals collected by sensors are de-noised by wavelet transform to eliminate the background noises, and time-frequency analysis is used to analyze the characteristics of frequency domain. The conclusion can be drawn that most acoustic signals are concentrated on the ranges of 0-100 Hz. The acoustic signal recognition and extraction methods are verified and compared with others and it proves that the disturbing signals can be efficiently removed by the analysis of time and frequency domain, while the new characteristics of the accumulative value difference, mean value difference and peak value difference of signals in adjacent intervals can detect the leak effectively and decrease the false alarm rate significantly. The formula for leak location is modified with consideration of the influences of temperature and pressure. The positioning accuracy can be significantly improved with relative error between 0.01% and 1.37%.
机译：气体管道的泄漏可以通过声学方法检测和定位。本文详细介绍了识别和提取波特征的技术，旨在从时域和频域中区分泄漏和干扰的信号。通过与现场传输管道的相似性分析，设计并建立了高压长距离泄漏测试回路。通过小波变换对传感器采集到的声波信号进行消噪，消除背景噪声，并通过时频分析对频域特性进行分析。可以得出结论，大多数声音信号集中在0-100 Hz的范围内。对声信号的识别和提取方法进行了验证和比较，证明了通过时域和频域分析可以有效地去除干扰信号，同时具有累积值差，均值差和峰值差的新特征。相邻间隔内的信号间隔可以有效地检测泄漏并显着降低误报率。考虑到温度和压力的影响，修改了泄漏位置的公式。相对误差在0.01％到1.37％之间，可以显着提高定位精度。

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