On a boundary integral solution of a lateral planar Cauchy problem in elastodynamics
For engineers and scientists dealing with inverse problems in elastodynamics, this provides a stable reconstruction technique, though it is an incremental extension of existing methods.
The paper presents a boundary integral method for stably reconstructing missing boundary data in elastodynamics for annular planar domains, using Laguerre transform and Tikhonov regularization. Numerical results demonstrate the method's practical effectiveness.
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 analysed and made explicit, and standard quadrature rules are used for discretisation. 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.