Local wavenumber imaging has been proven effective for damage detection in thin-walled structures. Such structures are, however, often inherently anisotropic, posing serious challenges to the known algorithms of local wavenumber mapping. The use of local wavenumber mapping algorithm designed for isotropic, rather than anisotropic, structures results in processing artifacts that may prohibit correct detection and characterization of defects. Therefore, in this work, we propose an improved implementation of the local wavenumber estimation algorithm for anisotropic media (ALWE). The working principle and efficiency of the proposed algorithm are illustrated on datasets coming from numerical simulations and experimental testing on anisotropic carbon fiber reinforced polymer (CFRP) laminates. We demonstrate that the proposed algorithm successfully compensates for the processing artifacts and enhances the overall quality of the wavenumber maps facilitating unequivocal damage detection.

中文翻译：

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各向异性结构中的局部波数成像


局部波数成像已被证明可有效检测薄壁结构中的损伤。然而，这种结构通常本质上是各向异性的，对已知的局部波数映射算法构成了严峻的挑战。使用专为各向同性而不是各向异性结构设计的局部波数映射算法会导致处理伪影，这可能会妨碍正确检测和表征缺陷。因此，在这项工作中，我们提出了一种改进各向异性介质局部波数估计算法 （ALWE） 的实现。所提出的算法的工作原理和效率在来自各向异性碳纤维增强聚合物 （CFRP） 层压板的数值模拟和实验测试的数据集上进行了说明。我们证明，所提出的算法成功地补偿了处理伪影，并提高了波数图的整体质量，促进了明确的损伤检测。