Vibration-based Damage Detection Method with Tunable Resolution for Composite Laminates

Jiyue Chen,Jie Zhou,Zheng Li,Kaihong Zheng,Bing Li,Jianlin Chen, Jie Zhu

MEASUREMENT（2024）

State Key Laboratory for Turbulence and Complex Systems | Dongguan Univ Technol | Northwestern Polytech Univ | China Univ Min & Technol Beijing

Cited 1|Views10

Abstract

Composite laminates are increasingly applied in advanced engineering structures, but they are prone to be damaged in service. However, multiple defects with different sizes challenge the current damage detection methods to identify all of them without a baseline. In this paper, a baseline-free damage identification method based on vibration is developed, and a novel damage index with tunable resolution of detection is proposed based on two-dimensional continuous wavelet transform by manipulating wavelet parameters. The relationship between the smallest detectable damage size and wavelet parameters is explored quantitatively, and the effectivity and reliability of proposed method are numerically and experimentally verified to directly detect damage in composite laminates without baselines. By a comparison with other vibration-based damage detection methods, results show that the proposed method can precisely locate and visualize multi-damage with determinate resolution of detection, and can realize multi-resolution of damage detection for identifying various sizes of defects.

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Key words

Damage identification,Resolution manipulation,Two-dimensional continuous wavelet transform,Vibration,Composite laminates

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