On a boundary integral solution of a lateral planar Cauchy problem in elastodynamics


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.

Publication DOI: https://doi.org/10.1016/j.cam.2019.112463
Divisions: College of Engineering & Physical Sciences > Mathematics
College of Engineering & Physical Sciences
Additional Information: © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Boundary integral equations,Cauchy problem,Elastodynamics,Laguerre transformation,Nyström method,Tikhonov regularization,Computational Mathematics,Applied Mathematics
Full Text Link: https://arxiv.o ... /abs/1809.11012
Related URLs: https://linking ... 377042719304662 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2020-03-15
Published Online Date: 2019-09-17
Accepted Date: 2019-06-12
Authors: Chapko, Roman
Johansson, B. Tomas (ORCID Profile 0000-0001-9066-7922)
Mindrinos, Leonidas

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