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arXiv 1612.06604math.APmath-phmath.MP
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各向异性介质的正、逆弹性散射

Direct and Inverse Elastic Scattering From Anisotropic Media

Gang Bao, Guanghui Hu, Jiguang Sun, Tao Yin

摘要:

假设时谐弹性波入射到嵌入均匀各向同性背景介质中的可穿透各向异性体上。我们在截断有界区域上提出了一个等价的变分公式,并通过应用Fredholm替代和利用二维和三维Dirichlet-to-Neumann映射的性质证明了弱解的存在性和唯一性.导出了近场解算子关于散射体边界的Fréchet导数。作为应用,我们设计了一种下降算法,用于从一个或多个入射方向和频率的近场数据恢复界面。二维数值算例表明了本文方法的有效性和准确性。

英文摘要:

Assume a time-harmonic elastic wave is incident onto a penetrable anisotropic body embedded into a homogeneous isotropic background medium. We propose an equivalent variational formulation in a truncated bounded domain and show the uniqueness and existence of weak solutions by applying the Fredholm alternative and using properties of the Dirichlet-to-Neumann map in both two and three dimensions. The Fréchet derivative of the near-field solution operator with respect to the boundary of the scatterer is derived. As an application, we design a descent algorithm for recovering the interface from the near-field data of one or several incident directions and frequencies. Numerical examples in 2D are presented to show the validity and accuracy of our methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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