声发射技术在管道泄漏检测中的应用

Application of acoustic emission technology in pipeline leak detection

针对传统的管道泄漏检测方法只能实时监测泄露,对泄漏量难以进行准确分析的不足,现采用声发射技术对泄露进行检测,该方法是一种较理想的动态检测方法,可以对管道泄漏信号进行定量的研究。经过试验研究,管道泄漏时的频域主要集中于0-300k Hz,且在150KHz左右处达到最大值,泄漏信号的幅值会随管道压力的增大而增加,随泄漏点距离的增加而呈现一定的衰减规律,随孔径变化呈现先增后减的规律。针对不同情况下泄漏信号的频域分析,可以运用小波包分解并对信号进行能量提取的方法进行分析,通过对采集的声发射信号的各频率的能量特征的准确分析,进一步验证声发射技术在检测管道泄漏方面的应用的可靠性。

Traditional methods of pipeline leak detection can only monitor leakage in real time,and it is difficult to analyze the leakage accurately.Acoustic emission is an ideal method for dynamic detection and it can be quantitatively studied in pipeline leakage signals. What is more,it can acquire more accurate position within a certain range.Through the experimental research, the frequency domain of the pipeline leakage is mainly concentrated in 0-300kHz,and it can reach the max value around 150KHz. The amplitude of the leakage signal increases with the increase of the pressure of the pipeline and shows a certain attenuation law with the increasing distance from leakage point,and it increases first and then decreases with the change of leakage aperture.By analysing frequency domain of leakage signals under different conditions and the energy characteristics of each frequency of the acoustic emission signal with wavelet packet decomposition and energy extraction, The feasibility of application of acoustic emission technique in pipeline leak detection is verified.