A method for locating multi-point leaks in pipelines based on improved vmd

Abstract

The invention relates to a method for locating pipeline multi-point leaks based on improved VMD, comprising: collecting original pipeline leakage signals; performing overall local mean value decomposition on the original leakage signals to obtain several PF components; calculating the correlation coefficient of each PF component, Screen out the required PF component according to the correlation coefficient, and carry out signal reconstruction according to the screened out PF component, determine the k value of the variational mode decomposition; carry out the variational mode decomposition to the reconstructed signal, obtain several IMF components, Calculate the multi-scale entropy value of each IMF component, and screen the IMF component according to the multi-scale entropy value of each IMF component; perform signal reconstruction on the screened IMF component, and perform cross-correlation positioning calculation on each leakage signal after blind source separation Complete pipeline leak location. The invention can effectively extract pipeline leakage signals, eliminate the influence of low correlation components and noise in the original leakage signals, and make the final positioning result more accurate.

Description

technical field [0001] The invention relates to a method for locating pipeline leakage, in particular to a method for locating pipeline multi-point leakage based on improved VMD. Background technique [0002] Urban pipelines have become an indispensable tool for the development of modern cities. With the continuous expansion of its scale, due to the natural aging of equipment, climate and environment, and man-made damage, pipeline failure incidents are on the rise. Especially once the gas pipeline leaks, it is easy to Cause fire, explosion, poisoning, environmental pollution and other vicious accidents. Therefore, how to effectively identify the small leakage in the early stage of the pipeline and accurately find the location of the leakage 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 combining software and hardware. Various n...

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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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