Method and device for identifying defect position of pipeline based on phase locus partitioned by round window

Abstract

The invention discloses a method and a device for identifying a defect position of a pipeline based on a phase locus partitioned by a round window. The method comprises the following steps: (1) stimulating ultrasonic guided wave signals on an end face of one side of the pipeline to enable ultrasonic guided waves to traverse all positions of the pipeline; (2) collecting echo signals at a site 10mm away from a stimulation end, and recording a time history curve of ultrasonic guided waves propagated in the pipeline; (3) calculating the detected echo signals by virtue of a Duffing chaotic system to obtain a phase locus of the ultrasonic guided wave signals, portioning the phase locus into two parts in and out of the round window by virtue of the round window so as to realize conversion from a two-dimensional phase diagram to a one-dimensional time signal, judging whether the pipeline is damaged or not according to a border line equation of the round window, if the pipeline is damaged, extracting a time point of the first ultrasonic guided wave signal entering the round window, and calculating by virtue of a wave velocity and time formula, so as to obtain information of the defect position of the pipeline. With the adoption of the method and the method, the detection efficiency of pipe detects can be improved, the maintenance cost can be reduced, and thus the method and the device have practical engineering application values.

Description

technical field [0001] The invention relates to a method for identifying defect location information in pipelines, in particular to a method for identifying pipeline defect locations based on round window segmented phase trajectories, belonging to the technical field of damage detection in the pipeline transportation industry. Background technique [0002] Pipeline transportation is known as the fifth largest means of transportation after railways, highways, aviation, and sea transportation. It is an important part of urban lifeline projects. Security service poses a potential threat. Therefore, it is necessary to analyze and identify the damage condition of the pipeline. [0003] In order to prevent the occurrence of pipeline vicious accidents, the annual maintenance cost of oil and gas pipelines in my country amounts to hundreds of millions of yuan, and it increases year by year. However, due to the constraints of detection methods, most of the pipeline damage is unknown...

AI Technical Summary

Problems solved by technology

However, due to the constraints of detection methods, most of the pipeline damage is unknown, often resulting in blind excavation, blind scrapping, and lack of scientific maintenance, resulting in a huge waste of manpower and material resources

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