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The Research on Location of the Leak of Natural Gas Based on the Wavelets Analysis

Author: XiongZhuang
Tutor: YangZhao
School: Tianjin University
Course: Refrigeration and Cryogenic Engineering
Keywords: Natural gas Leak Location Negative pressure wave Wavelet Transform Romberg integration algorithm
CLC: TE973.6
Type: Master's thesis
Year: 2009
Downloads: 94
Quote: 0
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Abstract


With the rapid development of the economy as well as the \resulting in personal injury , environmental pollution , as well as the national economy and property loss . And accurately pointed out that the leak location in order to reduce losses to a minimum , you need to be detected quickly after the spill occurred . Leak detection and location methods can be divided into three categories: model - based identification method , based on the method of signal processing and knowledge - based methods . The wavelet transform has good time - frequency characteristics of the signal processing method to quickly capture and precise positioning of the singular point , This article selected negative pressure wave method based on wavelet analysis as a method of leak detection and location . Leak location formula derivation , after the improved leakage positioning formula , proposed respectively calculate the average velocity of the two sections of the gas before and after the leak to replace the entire pipeline gas average flow rate calculated positioning . Romberg algorithm and binary search combined positioning algorithm . Negative pressure wave signal processing , simulation experiments compare and analyze the wavelet transform and Fourier transform , from the whole to the local search method is proposed to determine the pressure mutations , this approach compared to the traditional method can achieve higher the accuracy , it will not slow down the speed of the system analysis . Leak detection , the proposed combination of real-time model method and wavelet transform method , which can greatly increase system speed . Finally , through experimental the loop iteration algorithms and Romberg algorithm compared verify Romberg algorithm is better , the error in the 495 meters , to obtain better results .

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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Oil and gas storage and transportation machinery and equipment > Oil and gas pipelines > Pipeline inspection
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