An improved cross-correlation method based on wavelet transform and energy feature extraction for pipeline leak detection

다국어 초록 (Multilingual Abstract)

Early detection and precise location of leakage is of great importance for life-cycle maintenance and management of municipal pipeline system. In the past few years, acoustic emission (AE) techniques have demonstrated to be an excellent tool for on-line leakage detection. Regarding the multi-mode and frequency dispersion characteristics of AE signals propagating along a pipeline, the direct cross-correlation technique that assumes the constant AE propagation velocity does not perform well in practice for acoustic leak location. This paper presents an improved cross-correlation method based on wavelet transform, with due consideration of the frequency dispersion characteristics of AE wave and the contribution of different mode. Laboratory experiments conducted to simulate pipeline gas leakage and investigate the frequency spectrum signatures of AE leak signals. By comparing with the other methods for leak location identification, the feasibility and superiority of the proposed method are verified.

참고문헌 (Reference)

1 Kosel, T., "Location of acoustic emission sources generated by air flow" 38 (38): 824-826, 2000

2 Muggleton, J.M, "Leak noise propagation and attenuation in submerged plastic water pipes" 278 (278): 527-537, 2004

3 Ahadi, M., "Leak detection in water-filled plastic pipes through the application of tuned wavelet transforms to Acoustic Emission signals" 71 : 634-639, 2010

4 Brunner, A.J., "Acoustic emission monitoring of leaks in pipes for transport of liquid and gaseous media : a model experiment" 13-14 : 351-356, 2006

5 Juliano, T., "Acoustic emission leak detection on a metal pipeline buried in sandy soil" 4 (4): 149-155, 2013

6 Sinha, D. N., "Acoustic Sensor for Pipeline Monitoring" Los Alamos National Laboratory 2005

7 Ding, Y., "A new method for waveform analysis for estimating AE wave arrival times using wavelet decomposition" 37 : 279-290, 2004

8 Gao, Y., "A model of the correlation function of leak noise in buried plastic pipes" 277 (277): 133-148, 2004

9 Gao, Y., "A comparison of time delay estimators for the detection of leak noise signals in plastic water distribution pipes" 292 : 552-570, 2006