Impact Localization in Anisotropic Composites With Time Difference Matrix Matching and Edge Accuracy Optimization

Composites play an important role in the development of modern science and technology, but the special anisotropy leads to difficulties in impact localization. To achieve impact localization on composite materials, this article proposes a time difference matrix matching method with edge accuracy optimization. The method uses the propagation characteristics of Lamb waves in composite materials to solve the direction dependence of wave velocity. To overcome the anisotropy, the time difference feature vector of each element of the composite material is obtained by grid division, and the impact location is found according to the similarity. In addition, edge accuracy optimization is proposed to further improve localization accuracy. Using 49 points in the
$800\times800$
mm composite area for 147 impact tests, the result shows that the average error can reach 0.532 cm, and the variance is 0.217 cm2.