## Abstract

A boundary integral based method for the stable reconstruction of missing boundary data is presented for the governing hyperbolic equation of elastodynamics in annular planar domains. Cauchy data in the form of the solution and traction is reconstructed on the inner boundary curve from the similar data given on the outer boundary. The ill-posed data reconstruction problem is reformulated as a sequence of boundary integral equations using the Laguerre transform with respect to time and employing a single-layer approach for the stationary problem. Singularities of the involved kernels in the integrals are analyzed and made explicit, and standard quadrature rules are used for discretization. Tikhonov regularization is employed for the stable solution of the obtained linear system. Numerical results are included showing that the outlined approach can be turned into a practical working method for finding the missing data.

Original language | English |
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Article number | 112463 |

Journal | Journal of Computational and Applied Mathematics |

Volume | 367 |

Early online date | 17 Sep 2019 |

DOIs | |

Publication status | Published - 15 Mar 2020 |

### Bibliographical note

© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/## Keywords

- Boundary integral equations
- Cauchy problem
- Elastodynamics
- Laguerre transformation
- Nyström method
- Tikhonov regularization