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《Chinese Journal of Scientific Instrument》 2015-10
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Pipeline leakage localization based on ELMD and high-order ambiguity function

Sun Jiedi;Xiao Qiyang;Wen Jiangtao;Wang Fei;School of Information Science and Engineering,Yanshan University;Key Laboratory of Measurement Technology and Instrumentation of Hebei Province,Yanshan University;China Petroleum and Gas Pipeline Telecommunication and Electricity Engineering Corporation;  
Aiming at the localization problem in natural gas pipeline leakage detection,a time delay estimation method based on ensemble local mean decomposition( ELMD) and high-order ambiguity function is proposed. Firstly,the ELMD method was adopted to decompose the acoustic emission signals and obtain the production function( PF) components. A PF component automatic selection method based on K-L divergence was used to process these PF components and obtain the principal PF components containing most of the leakage information. On this basis,the high-order ambiguity function was applied to calculate the time-frequency parameters of the principal PF components,and obtain the arrival time difference of the characteristic frequencies through time-frequency analysis. Finally,combining the time difference with the signal propagation speed of the generalized acoustic emission signals produced by the leakage,the natural gas pipeline leakage localization was accomplished. Experiment results show that the proposed method can locate the leakage,and the localization accuracy is apparently higher than that of the direct correlation method.
【Fund】: 国家自然科学基金(51204145);; 河北省自然科学基金(E2013203300)项目资助
【CateGory Index】: TU996.8
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