Method of quantitatively detecting pipeline defects based on ultrasonic guided waves

A technology for detecting pipelines and ultrasonic guided waves, which is applied in the direction of material analysis using sound waves/ultrasonic waves/infrasonic waves, processing detection response signals, measuring devices, etc., and can solve problems such as difficulties in solving basic solutions

Active Publication Date: 2019-01-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a method for quantitatively detecting pipeline defects based on ultrasonic guided waves, which effectively solves the problem of difficulty in solving the basic solution in the defect reconstruction method of the boundary integral equation, and at the same time weakens the It overcomes the restrictive conditions in defect reconstruction and provides an efficient and easy new method for pipeline inspection in actual engineering

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  • Method of quantitatively detecting pipeline defects based on ultrasonic guided waves
  • Method of quantitatively detecting pipeline defects based on ultrasonic guided waves
  • Method of quantitatively detecting pipeline defects based on ultrasonic guided waves

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Embodiment 1

[0145] Example 1: Investigating the influence of different reference defects on the reconstruction results of unknown rectangular defects:

[0146] Figure 5a , Figure 5b , Figure 5c and Figure 5d It is a schematic diagram of defects to be reconstructed (or known as unknown defects), in the figure d ay and l ay Denote the depth and width of an axisymmetric defect, respectively. according to Figure 4The reflection coefficients of different reference defects in , reconstructed Figure 5a medium rectangle defect, the result is as Figure 6 shown. apparently based on Figure 3a The reconstruction result of the reference defect (the first kind of reference defect) is closer to the actual defect shape, but no matter what kind of reference defect is used, the actual defect can be effectively reconstructed.

Embodiment 2

[0147] Example 2: Investigating the influence of different reference defects on the reconstruction results of unknown ladder-shaped defects:

[0148] pass Figure 3a , Figure 3b , Figure 3c Two-step and five-step defects (such as Figure 5b and Figure 5c ) for reconstruction, the result is as follows Figure 7 and Figure 8 shown. Figure 7 According to Figure 3b (The second reference defect) The reconstructed result is closer to the double-ladder defect, Figure 8 shown in the Figure 3a (The first kind of reference defect) The reconstructed result is closer to the five-step defect.

Embodiment 3

[0149] Example 3: Investigating the influence of different reference defects on the reconstruction results of unknown double rectangle defects:

[0150] Figure 9 The reconstruction results of double-rectangular defects are shown. Because double-rectangle defects are more complex in reconstruction, the reconstruction results of different reference defects are quite different, but they can all reflect the number and size of defects. According to the reference defect Figure 3b (The second type of reference defect) The shape of the reconstructed defect is more consistent with the actual defect.

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Abstract

The invention discloses a method of quantitatively detecting pipeline defects based on ultrasonic guided waves. The method comprises the following steps of: solving the reflection coefficient of a T (0,1) mode in a pipeline with defects, to be specific, calculating the scattered field in the pipeline by adopting a mixed finite element method and obtaining the corresponding reflection coefficient;establishing the relationship between the defect and the reflection coefficient: to be specific, obtaining the relationship between the defect shape and the reflection coefficient through a boundary integral equation and Fourier transform, and establishing a Fourier transform pair; and solving a defect expression, to be specific, establishing a reconstitution equation of the defect through inverseFourier transform, and obtaining the final expression of the defect according to the ratio solved through the reference detect and the unknown defect reflection coefficient. The method effectively solves the problem that the solving of elementary solution is difficult in the boundary integral equation reconstitution defect method, weakens the restrictive condition in the defect reconstitution, and provides an efficient and easy new method for pipeline detection in practical engineering.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a method for quantitatively detecting pipeline defects based on ultrasonic guided waves. Background technique [0002] A large number of applications of oil and gas pipelines in real life make the work of real-time detection very complicated and inefficient. If the defects in the pipeline are not discovered in time, or the defects cannot be accurately evaluated, it is very likely to cause major accidents and endanger people's lives and property. [0003] Conventional non-destructive testing and evaluation methods in the industry include magnetic particle testing, ray testing, eddy current testing, ultrasonic testing, etc. Among them, ultrasonic non-destructive testing is a widely used testing method, which has important application value in the field of large-scale structure testing. Due to its high frequency and short wavelength, ultrasonic waves can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44G01N29/46
CPCG01N29/4472G01N29/46G01N2291/0289
Inventor 钱征华王彬笪益辉刘电子
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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