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| Pipe Leak Detection and Location Method Based on Dual Tree Complex Wavelet Transform and Recurrence Plot |
| WANG Hui-xin,WANG Yu-tian, HUANG Man-yi,WANG Xiao-jing, ZHANG Shu-qing,CHEN Ying,WANG Shi-hao |
| Meas Tech & Instrumentation Key Lab of Hebei Province, Yanshan University, Qinhuangdao, Hebei 066004, China |
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Abstract A method of pipeline leak detection and location which is combined dual-tree complex wavelet transform (DT CWT) and recurrence plot (RP) average gray was introduced. DT CWT could overcome the shortcomings of traditional discrete wavelet transform and extract the signal feature completely. The RP average gray method could give the clear boundary of adjacent areas near the diagonal for prophase, interim and later stage of leak and locate leaks more accurately comparing with traditional wavelet modulus maxima method.The pressure signals of monitoring points were transformed by the dual-tree complex wavelet to extract characteristics of the signal. Then, according to analyzing characteristics of the signal by RP, the demarcation point that changed significantly of the area was determined as the leakage characteristic time. Finally, the leakage location was determined based on the principle of negative pressure wave. Simulation results showed the effectiveness and the superiority of this method.
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Received: 15 July 2014
Published: 20 October 2015
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2015, Vol. 36 
