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Shape optimization approach to defect-shape identification with convective boundary condition via partial boundary measurement

  • Julius Fergy T. RabagoEmail author
  • Hideyuki Azegami
Original Paper Area 2
  • 29 Downloads

Abstract

We aim to identify the geometry (i.e., the shape and location) of a cavity inside an object through the concept of thermal imaging. More precisely, we present an identification procedure to determine the geometric shape of a cavity with convective boundary condition in a heat-conducting medium using the measured temperature on a part of the surface of the object. The inverse problem of identifying the cavity is resolved by shape optimization techniques, specifically by minimizing a least-squares type cost functional over a set of admissible geometries. The computation of the first-order shape derivative or shape gradient of the cost is carried out through minimax formulation, which is then justified by the Correa–Seeger theorem coupled with function space parametrization technique. We further characterize its boundary integral form using some identities from tangential calculus. Then, we utilize the computed expression for the shape gradient to implement an effective boundary variation algorithm for the numerical resolution of the shape optimization problem. To avoid boundary oscillations or irregular shapes in our approximations, we execute the gradient-based scheme using the \(H^1\) gradient method with perimeter regularization. Also, we propose a novel application of the said method in computing the mean curvature of the free boundary appearing in the shape gradient of the cost functional. We illustrate the feasibility of the proposed method by testing the numerical scheme to several cavity identification problems. Additionally, we also give some numerical examples for the case of corrosion detection since its inverse problem interpreted in the framework of electrostatic imaging is closely related to the focused problem.

Keywords

Shape identification Shape optimization Geometric inverse problem Lagrange multiplier method Minimax formulation 

Mathematics Subject Classification

49Q10 49Q12 34A55 35Q93 

Notes

Acknowledgements

J. F. T. Rabago greatly acknowledges Monbukagakusho (the Japanese Ministry of Education, Culture, Sports, Science and Technology) for scholarship support during his PhD program.

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Copyright information

© The JJIAM Publishing Committee and Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate School of InformaticsNagoya UniversityNagoyaJapan

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