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arXiv 2009.14747math.AP
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一类半空间裂纹反问题的稳定性

Stability properties of a crack inverse problem in half space

Darko Volkov, Yulong Jiang

摘要:

本文给出了半空间中裂纹反问题的Lipschitz稳定性结果。正问题是一个Laplace方程,其上边界Neumann条件为零。强迫项是裂纹上的不连续性。这个公式可以与弹性介质中的地质断层或减去内壁的半空间中的无旋不可压缩流动有关。直接问题在适当的函数空间中被很好地提出。我们研究了相关的反问题,其中跨越裂纹的跳跃是未知的,更重要的是,几何形状和裂纹的位置是未知的。反问题的数据是Dirichlet型的顶部边界的一部分。我们证明了这个反问题是唯一可解的一些假设下的几何形状的裂纹。本文的亮点是显示了稳定性的结果,这个反问题。假设裂纹是平面的,我们表明,重建包含裂纹的平面是Lipschitz稳定的,尽管事实上,强迫项为基础的PDE是未知的。这个一致稳定性的结果保持在强迫项是有界的上和Dirichlet数据是有界的下远离零在适当的规范的假设下。

英文摘要:

We show in this paper a Lipschitz stability result for a crack inverse problem in half space. The direct problem is a Laplace equation with zero Neumann condition on the top boundary. The forcing term is a discontinuity across the crack. This formulation can be related to geological faults in elastic media or to irrotational incompressible flows in a half space minus an inner wall. The direct problem is well posed in an appropriate functional space. We study the related inverse problem where the jump across the crack is unknown, and more importantly, the geometry and the location of the crack are unknown. The data for the inverse problem is of Dirichlet type over a portion of the top boundary. We prove that this inverse problem is uniquely solvable under some assumptions on the geometry of the crack. The highlight of this paper is showing a stability result for this inverse problem. Assuming that the crack is planar, we show that reconstructing the plane containing the crack is Lipschitz stable despite the fact that the forcing term for the underlying PDE is unknown. This uniform stability result holds under the assumption that the forcing term is bounded above and the Dirichlet data is bounded below away from zero in appropriate norms.

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