arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2610.13629math.APcs.NAmath.NAmath.OCmath.SP
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带有边界变Robin参数的波动方程的逆谱问题

An inverse spectral problem for the wave equation with a varying Robin parameter at the boundary

Antti Hannukainen, Petr Kulikov, Matti Lassas, Lauri Oksanen

AI总结:

本文针对带变Robin参数的波动方程逆谱问题,提出两步恢复流程,结合正则化策略实现波速的高精度鲁棒恢复,证明了相关映射的连续性并完成数值验证。

摘要:

本文研究了波速为$c(x)$的$(1+1)$维波动方程的逆谱问题,谱数据由算子$-c^2(x)\partial_x^2$的Neumann-Dirichlet问题的特征值及其关于边界Robin参数的导数构成。本文提出了两步恢复流程:第一步利用arXiv/0406582的结果从谱数据中重构Neumann-to-Dirichlet映射$\Lambda$;第二步将重构得到的$\Lambda$应用于arXiv:1509.04478提出的边界控制方法的正则化策略中。作为改进,控制问题的正则化采用$L^2$与$H^1$惩罚项的加权组合,本文证明了最优控制族的一致收敛结果,从而可同时调节正则化参数。此外,本文还证明了将波速映射到其谱数据的正向谱映射是Lipschitz连续的,且该重构流程对应的逆谱映射在波速的一个子类上是Hölder连续的。该方法已数值实现,并在光滑和分段光滑的波速剖面进行了验证,数值实验表明波速的恢复具有高准确性和鲁棒性。

英文摘要:

An inverse spectral problem for a $(1+1)$-dimensional wave equation with wave speed $c(x)$ is considered. The spectral data consist of the eigenvalues of the Neumann--Dirichlet problem for the operator $-c^2(x)\partial_x^2$ together with their derivatives with respect to a Robin parameter at the boundary. We propose a two-step recovery procedure. In the first step, the Neumann-to-Dirichlet map $Λ$ is reconstructed from the spectral data using the results of arXiv/0406582. In the second step, the reconstructed $Λ$ is used within the regularization strategy for the boundary control method presented in arXiv:1509.04478. As an improvement, the regularization of the control problems employs a weighted combination of $L^2$ and $H^1$ penalty terms, and we prove a uniform convergence result for the family of optimal controls, thereby allowing the regularization parameters to be tuned simultaneously. We also prove that the forward spectral map, which assigns to a wave speed its spectral data, is Lipschitz continuous, and that the inverse spectral map underlying the reconstruction procedure is Hölder continuous on a subclass of wave speeds. The method is implemented numerically and validated on both smooth and piecewise smooth wave speed profiles. Numerical experiments demonstrate that the recovery of the wave speed exhibits high accuracy and robustness.

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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