Negative pressure wave inflection point recognizing method based on linear fitting

Abstract

The invention belongs to the technical field of pipeline leakage detection, and relates to a negative pressure wave inflection point recognizing method based on linear fitting. The method comprises the steps that before a pipeline is leaked, a negative pressure wave denoising signal stable segment shows, after the pipeline is leaked, a negative pressure wave denoising signal descending segment shows, proper data are selected for linear fitting, and through solving a crossing point of two straight lines, a negative pressure wave inflection point can be rapidly and precisely obtained. On the premise of keeping original negative pressure wave signal characteristics as much as possible, the negative pressure wave inflection point recognizing precision and speed can be improved, the method is simple in principle and can be embedded in most program systems directly, cost is low, and the application range is wide. Through real-time online detection of the negative pressure wave inflection point and other involved negative pressure wave inflection point recognized pipeline leakage detection and positioning methods, the method has the positive meaning in the leakage point positioning precision and the positioning speed.

Description

technical field [0001] The invention belongs to the technical field of pipeline leakage detection and relates to a negative pressure wave inflection point identification method based on linear fitting. Background technique [0002] Pipelines are like a lifeline, undertaking the important task of safely transporting oil, natural gas, water resources, etc., which are related to the national economy and people's livelihood resources. However, with the increase of pipeline service time, pipeline leakage often occurs due to reasons such as corrosion, aging, weld defects, changes in geological conditions, and third-party damage. Especially for long-distance high-pressure pipelines, once the pipeline leaks, the amount of leakage will be large and the repair will be difficult. It will be more destructive and harmful than low-level pipelines, leading to serious leakage accidents. Therefore, detecting the leakage of high-pressure pipelines in time and accurately locating the location...

AI Technical Summary

Problems solved by technology

However, it requires a multi-scale wavelet transform on the negative pressure wave signal. As the scale increases, this will cause the singular point to deviate, resulting in measurement errors; in addition, the workload is large and the calculation time is long, and it is often impossible to locate it in the first time. The location of the pipeline leak

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