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Identification of Unknown Remanent Magnetization in the Ferromagnetic Ship Hull Utilizing Material Sensitivity Information Combined with Magnetization Modeling |
Journal of Magnetics, Volume 16, Number 2, 30 Jun 2011, Pages 114-119 |
Nam-Kyung Kim (Department of Electrical Engineering, Kyungpook University), Giwoo Jeung (Department of Electrical Engineering, Kyungpook University), Chang-Seob Yang (The 6th R&D Institute-2, Agency for Defense Development), Hyun-Ju Chung (The 6th R&D Institute-2, Agency for Defense Development), Dong-Hun Kim * (Department of Electrical Engineering, Kyungpook University) |
Abstract |
This paper presents a magnetization modeling method combined with material sensitivity information to identify the unknown magnetization distribution of a hull and improve the accuracy of the predicted fields. First, based on the magnetization modeling, the hull surface was divided into three-dimensional sheet elements, where the individual remanent magnetization was assumed to be constant. For a fast search of the optimum magnetization distribution on the hull, a material sensitivity formula containing the first-order gradient information of an objective function was combined with the magnetization modeling method. The feature of the proposed method is that it can provide a stable and accurate field solution, even in the vicinity of the hull. Finally, the validity of the method was tested using a scale model ship.
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Keywords: adjoint variable method; inverse problems; Lagrange multiplier; magnetic anomaly; magnetization modeling |
DOI: 10.4283/JMAG.2011.16.2.114 |
Full Text: PDF |
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