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Pipeline corrosion detection method based on wavelet transformation

A technology of wavelet transform and corrosion detection, which is applied to measuring devices, processing detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as difficult extraction of pipeline quality characteristic indicators, and achieve automatic discrimination and calculation The effect of fast speed and real-time rapid detection

Active Publication Date: 2021-10-08
BEIHANG UNIV +1
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Problems solved by technology

[0004] The acoustic-vibration signal obtained by the hammer strike contains the physical state information of the specimen, but it is difficult to extract effective pipeline quality characteristic indicators directly from the time-domain analysis

Method used

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  • Pipeline corrosion detection method based on wavelet transformation
  • Pipeline corrosion detection method based on wavelet transformation
  • Pipeline corrosion detection method based on wavelet transformation

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Embodiment Construction

[0038] In order to better understand the technical solutions of the present invention, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The same reference numbers in the figures indicate functionally identical or similar elements. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0039] The whole test system includes a hammer device, an acceleration sensor with a magnetic base, a data acquisition board, an industrial computer and a metal pipe to be tested. The acceleration sensor is adsorbed on the surface of the metal pipe through the magnetic base. When the pipe is hit with a hammer, the acoustic vibration signal of the metal pipe is obtained through the data acquisition board on the industrial computer.

[0040] like figure 1 As shown, a pipeline corrosion detection ...

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Abstract

The invention provides a pipeline corrosion detection method based on wavelet transformation, which comprises the following steps: S1, knocking a pipeline by using a force hammer, and collecting signals of an acceleration sensor; S2, selecting a cmor wavelet as a mother wavelet, and carrying out continuous wavelet transformation and mapping on an input signal x (t) to obtain a time-frequency domain expression of x (t) wavelet transformation; S3, performing screening and filtering on the time-frequency domain expression to obtain a WTfilter (t, f); S4, calculating a double integral of the WTfilter (t, f) about frequency and time in the time range; and S5, setting pipeline corrosion degree judgment indexes y1 and y2, and judging the quality of the pipeline according to the integral value. According to the method, after threshold screening is creatively extracted, the integral of the characteristic range in the time-frequency plane is used as the pipeline quality discrimination characteristic, and a new thought is provided for a characteristic extraction algorithm based on the time-frequency domain; and the testing method is simple and convenient, the limitation of searching damage characteristics by manual comparison is avoided, and the automatic judgment of the pipeline corrosion quality is realized.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a pipeline corrosion testing method based on wavelet transform. Background technique [0002] Pipeline transportation is an important mode of modern fluid transportation. It uses pipelines as a means of transportation to transport oil, natural gas, water, mud, gas, chemical gases and other gases or liquids over long distances. Pipeline transportation has the advantages of large transportation volume, low cost, safety and reliability, less land occupation, and continuous transportation without being affected by the weather. It is widely used in the oil and gas industry and other fields. However, due to the harsh working environment of pipeline transportation, the dark and cold air outside and the liquid or gas transported inside will make metal pipelines vulnerable to corrosion damage, which may lead to pipeline leakage accidents, resulting in serious consequences ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/045G01N29/4472
Inventor 高飞童彤华佳东张晗林京
Owner BEIHANG UNIV
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