期刊
NDT & E INTERNATIONAL
卷 116, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2020.102277
关键词
Lamb wave; Sparse representation; Multiple sparse Bayesian learning; Composite laminates
资金
- National Natural Science Foundation of China [51805015, 91860205]
- National Key Laboratory of Science and Technology on Reliability and Environmental Engineering [6142004190502]
- Aerospace Science and Technology Foundation
Lamb wave techniques have been widely used for structural health monitoring (SHM) and nondestructive testing (NDT). To deal with dispersive and multimodal problems of Lamb wave signals, many signal processing methods have been developed. A spatially distributed array of piezoelectric transducers is generally adopted for both transmission and reception of Lamb waves. When imaging the damage in composite laminates, it is necessary to meet the need of processing array signals with high efficiency. In this paper, the multiple sparse Bayesian learning (M-SBL) strategy is employed for damage imaging. Multiple residual signals including damage-reflection waves are decomposed into a sparse matrix of location-based components simultaneously. An appropriate dictionary is designed to match the damage-reflection waves instead of interference waves. The key to success is to obtain the sparse matrix of weighting coefficients through the M-SBL algorithm. Damage imaging can be achieved efficiently using the delay-and-sum (DAS) method with sparse coefficients in time-domain. Results from the experiment in composite laminates demonstrate the effectiveness of the proposed method.
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