Pipeline multi-point leakage positioning method based on improved VMD

Abstract

The invention relates to a pipeline multi-point leakage positioning method based on improved VMD. The method comprises the following steps of collecting an original leakage signal of a pipeline; performing overall local area mean value decomposition on the original leakage signal to obtain a plurality of PF components; calculating a correlation coefficient of each PF component, screening out the required PF component according to the correlation coefficient, performing signal reconstruction according to the screened PF component, and determining K value of variational mode decomposition; performing variational mode decomposition on the reconstructed signal to obtain a plurality of IMF components, calculating a multi-scale entropy value of each IMF component, and screening the IMF components according to the multi-scale entropy value of each IMF component; and performing signal reconstruction on the screened IMF component, and performing cross-correlation positioning calculation on eachleakage signal subjected to blind source separation to complete pipeline leakage positioning. According to the method, the leakage signal of the pipeline can be effectively extracted, the influence of low relevant components and noise in the original leakage signal is eliminated, and the final positioning result is more accurate.

Description

Technical field [0001] The invention relates to a pipeline leakage location method, in particular to a pipeline multi-point leakage location method based on improved VMD. Background technique [0002] Urban pipelines have become an indispensable tool for the development of modern cities. As their scale continues to expand, pipeline failures are on the rise due to the effects of natural aging of equipment, climate, environment, and man-made damage, especially when gas pipelines leak. Cause fire, explosion, poisoning, environmental pollution and other vicious accidents. Therefore, how to effectively identify the small leaks in the early stage of the pipeline and accurately locate the leak point has good economic value and social significance. [0003] In recent years, with the development of computer technology, pipeline leak detection technology is developing in the direction of the combination of software and hardware. Various new pipeline leak detection methods are still the fron...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of difficult signal feature extraction and inaccurate positioning in the existing pipeline multi-point leakage location method, and provide a pipeline multi-point leakage location method based on improved VMD, by calculating the correlation of each component of the ELMD decomposition result Coefficient, analyze and select the number of decomposition layers in the VMD method, extract the leakage signal more effectively, improve the accuracy of leakage location, and enhance the practicability and reliability of the method

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