A method of progressive damage growth imaging suitable for composite structures

By extracting the variation law of damage factors through piezoelectric sensing networks, calculating asymptotic weighting coefficients, optimizing guided wave flight time, and establishing a mapping process, the accuracy problem of internal damage propagation imaging of composite material structures is solved, and the reliability of damage diagnosis of composite material structures in aircraft is improved.

CN117517466BActive Publication Date: 2026-06-19SHANGHAI SPACE PRECISION MACHINERY RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI SPACE PRECISION MACHINERY RES INST
Filing Date
2023-10-31
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies are insufficient for accurately imaging the damage propagation process within composite material structures, leading to inaccurate diagnosis of aircraft structural damage.

Method used

By extracting the damage factor variation law of each excitation-sensing channel through a piezoelectric sensing network, calculating the asymptotic weighting coefficient, optimizing the guided wave flight time calculation, enhancing the signal, suppressing non-damage path signals, solving the signal problem, establishing the guided wave velocity mapping process, and realizing damage propagation imaging.

Benefits of technology

This technology effectively improves the field of composite materials for aircraft, solving specific problems that are difficult to address in existing technologies. It demonstrates the effectiveness of existing technologies in effectively addressing specific problems, and provides accurate technical means to solve these problems. By implementing these technical means, it addresses specific issues that existing technologies have failed to resolve, including the difficulty of accurately imaging in existing technologies. Furthermore, it achieves accurate imaging of the damage propagation process within composite material structures.

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Abstract

This invention proposes a progressive damage propagation imaging method suitable for composite material structures, belonging to the field of aircraft structural health monitoring technology. The method first uses the difference between the signal characteristics of each excitation-sensing channel in a piezoelectric sensing network and the reference signal characteristics as a damage factor; then, it calculates the progressive increment of the damage factor of each channel accompanying the damage propagation process, thereby progressively weighting the damage scattering signal at the current moment; and based on the mapping process, it obtains the guided wave propagation flight time of the anisotropic structure; finally, it substitutes the progressively weighted damage scattering signal and flight time into a delay-accumulation imaging algorithm to obtain a series of continuously accumulating damage information, thus achieving damage propagation imaging. This invention solves the problem that conventional damage imaging methods are difficult to accurately image the propagation process of internal damage in composite material structures, effectively improving the reliability of damage diagnosis for aircraft composite material structures.
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