Multi-point leakage location method based on VMD-PSE (variation mode decomposition and power spectral entropy) for pressure pipeline

Abstract

The invention provides a multi-point leakage location method based on VMD-PSE (variation mode decomposition and power spectral entropy) for a pressure pipeline. The multi-point leakage location methodbased on the VMD-PSE comprises the following steps of: introducing power spectrum entropy by combining the variation mode decomposition and the power spectral entropy for distinguishing the low frequency region and high frequency region of a leakage signal, compensating for the shortcoming in the unsatisfactory signal separation of the variation mode decomposition in the high frequency region, and effectively processing the high and low frequency regions of the signal to obtain more and effective leakage information; extracting characteristic values through singular value decomposition for estimating a source signal, and separating out each source leakage signal by combining a blind source separation method; and finally extracting the delay of each source leakage signal by utilizing a time-frequency analysis method, and realizing the accurate location of the multi-point leakage of the pipeline.

Description

technical field [0001] The invention relates to the technical field of pipeline leakage detection and positioning, in particular to a VMD-PSE-based pressure pipeline multi-point leakage positioning method. Background technique [0002] With the acceleration of urbanization, the scale of urban buried oil and gas pipelines is getting larger and larger. In the long-term use of the pipeline, due to various factors such as internal and external corrosion, the pipe wall is thinned or broken and leaks occur, especially the small leaks that occur in the early stage are difficult to be detected due to the small amount of leakage, and it is difficult to be captured by the online monitoring system , with greater concealment. [0003] Since the multi-point leakage source of the pipeline is not only interfered by the non-leakage signal, but also the signals between the leakage sources influence each other, it will cause a large error in the location of the multi-point leakage, coupled w...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in order to overcome the problem that the effective signal of multi-point leakage in pipeline is difficult to extract, and realize the extraction of effective leakage signal and the precise positioning of multi-point leakage

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