A circular defect reconstruction method based on circumferential guided wave time domain inverse scattering method

Through the circular defect reconstruction method based on the circumferential guide wave time domain inverse scattering method, the problem of difficulty in quantitative detection of circumferential defects in the pipeline section in the prior art is solved, and the accurate reconstruction of defect position and shape is achieved, and the accuracy of defect detection is improved.

CN116087344BActive Publication Date: 2025-03-28NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Application Number
CN202211542116.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-02
Publication Date
2025-03-28
Estimated Expiration
2042-12-02

AI Technical Summary

Technical Problem

It is difficult to quantitatively detect the position and shape of circumferential defects in the pipeline cross-section, especially in the detection of defects in three-dimensional pipelines.

Method used

The circular defect reconstruction method based on the circumferential guide wave time domain inverse scattering method is adopted. By solving the incident wave field and time domain Green function of the defect-free ring, the boundary integral equation of the time domain scattering wave field is derived, and the Bonn approximation is introduced to reconstruct the position and shape of the defect.

Benefits of technology

The accurate position and shape of defects in the ring is realized, and the defect information can be directly solved without knowing the approximate position of the defect, which improves the accuracy of defect detection.

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Abstract

The present invention provides a method for reconstructing annular defects based on a circumferentially guided wave time-domain inverse scattering method, comprising the following steps: S1: solving the incident wave field of a defect-free annular ring; specifically: simulating the incident wave field through commercial finite element software, or using a modal expansion method, first obtaining the components of each mode, and then superimposing all modes to obtain the incident wave field; S2: solving the time-domain Green's function of a defect-free annular ring; specifically: setting the load as a pulse excitation, and obtaining the time-domain Green's function through a modal expansion method; S3: reconstructing defects in the annular ring; specifically: deriving the boundary integral equation of the time-domain scattered wave field, introducing the Born approximation, replacing the total field with the incident field approximation, taking the change in the material in the annular ring as an unknown in the boundary integral equation, collecting the scattering field displacement, solving the unknown, and thus reconstructing the position and shape of the defect. After obtaining the scattering field displacement, the present invention can directly solve the accurate position and specific shape of the defect in the annular ring.
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