Ultrasonic guided wave damage ellipse imaging positioning method and equipment for layering decreasing composite material laminated plate

By considering the thickness variation and anisotropic properties of decreasing layup composite laminates, the calculation of ultrasonic guided wave propagation time is optimized, solving the positioning error problem of traditional elliptical positioning algorithms in decreasing layup composite laminates, and achieving more accurate damage detection and positioning.

CN121856397APending Publication Date: 2026-04-14XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202610253184.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-03
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Traditional elliptical positioning algorithms suffer from large positioning errors and low damage detection accuracy in ultrasonic guided wave propagation behavior in decreasing layup composite laminates due to variations in laminate thickness and the anisotropic properties of the material. Therefore, they are not suitable for ultrasonic guided wave damage detection and positioning in decreasing layup composite laminates.

Method used

By acquiring the thickness variation and material anisotropy parameters of the laminate, the propagation path and velocity of guided waves in the laminate are simulated to generate a theoretical propagation time spectrum. Combined with the actual flight time, candidate damage regions are determined, and the damage location is located by fusion using multiple sets of transducers.

Benefits of technology

It improves the accuracy and reliability of damage detection, reduces positioning errors, and enables accurate damage positioning of down-lay composite laminates.

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Abstract

The invention discloses an ultrasonic guided wave damage ellipse imaging positioning method and equipment for a layer decreasing composite material laminated plate. The method comprises the following steps: S1, acquiring thickness change direction information of the laminated plate and position coordinates of an excitation transducer and a receiving transducer; s2, according to the material characteristic parameters, simulating and calculating the propagation time of ultrasonic guided waves transmitted from an excitation transducer to any point to generate a first theoretical propagation time map, and simulating and calculating the propagation time of the ultrasonic guided waves transmitted from any point to a receiving transducer to generate a second theoretical propagation time map to generate a second theoretical propagation time map; coupling influence of thickness change and material anisotropy on guided wave propagation is considered in the simulation process; s3, transmitting an ultrasonic guided wave signal, and extracting the actual flight time of a damaged wave packet; s4, calculating theoretical total propagation time, and determining a candidate area where damage exists; and S5, on the basis of repeated operation of the multiple groups of transducer pairs, taking a plurality of candidate region intersections to determine a final damage position. The objective of the invention is to solve the positioning error problem caused by the structural characteristics of a laminated plate in a traditional algorithm, and to realize more accurate damage detection and positioning.
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