Gas pipeline leakage point positioning method based on acoustic frequency shift inversion

Abstract

The invention discloses a gas pipeline leakage point positioning method based on acoustic frequency shift inversion. The method comprises the following steps that direct wave signals generated in a gas pipeline leakage point is received, arrayed and detected, then the direct wave signals received by each wave detector is subjected to spectrum analysis, and the centroid frequency of each direct wave signal is calculated to obtain a centroid frequency-distance fit curve (xi,); and according to the obtained centroid frequency-distance fit curve, the transverse position of the gas pipeline leakagepoint is determined through observing the change rule of the curve, and a genetic algorithm is adopted to carry out model inversion, wherein the algorithm adopts genetic operation with variation, crossing and selection, so that superior data are selected, inferior ones are eliminated, and repeated iteration is carried out, and finally the optimal solution is found until the depth position of thegas pipeline leakage point is determined. According to the gas pipeline leakage point positioning method based on acoustic frequency shift inversion, the attenuation characteristics of the gas leakagesound wave centroid frequencies is utilized for leakage point positioning, so that the positioning precision of the leakage point is effectively improved, and meanwhile the anti-interference capability is high.

Description

technical field [0001] The invention relates to a method for locating a leakage point of a gas pipeline, in particular to a method for locating a leakage point of a gas pipeline based on acoustic wave frequency shift inversion. Background technique [0002] As one of the essential infrastructures of cities, the gas pipeline network has developed rapidly in many cities in recent years, and it has made great contributions to purifying the urban air environment and improving people's living standards. In the urban gas transmission and distribution system, there are hidden dangers of leakage no matter whether the gas pipelines are laid underground or overhead. Because the gas pipeline will be disturbed by various internal and external factors during operation, such as pipeline corrosion, material defects, etc., resulting in leakage or fracture of the pipeline orifice. And city gas is flammable, explosive and toxic. Once it leaks and reaches a certain concentration, it is very e...

AI Technical Summary

Problems solved by technology

However, the accuracy of sound source localization still depends on the accuracy of the prediction of the difference in the arrival time of the sound wave. Because the existence of noise seriously affects the determination of the arrival time of the sound wave in actual situations, the existing sound wave detection method is not effective in some noise-interference environments. Medium detection accuracy is low

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