NDLI: Magnetic Dipole Modeling Combined With Material Sensitivity Analysis for Solving an Inverse Problem of Thin Ferromagnetic Sheet

Content Provider	IEEE Xplore Digital Library
Author	Giwoo Jeung Chang-Seob Yang Hyun-Ju Chung Se-Hee Lee Dong-Hun Kim
Copyright Year	1965
Abstract	This paper presents an efficient methodology for determining the underwater field anomaly due to the remanent magnetization of a ferromagnetic ship hull by utilizing a magnetic dipole modeling technique combined with material sensitivity analysis. The complicated 3D structure of the hull is replaced with an equivalent magnetic dipole array placed in a 2D plane, of which the optimal dipole moment values will be easily sought out with the aid of material sensitivity analysis. To achieve this, a material sensitivity formula, which contains the first-order gradient information of an objective function with respect to the magnetic dipoles, is analytically derived by exploiting the augmented objective function and adjoint variable method. The proposed method leads to easy numerical implementation and also dramatically reducing system unknowns of the 3D inverse problem considered. Finally, the validity of the method has been tested with real measurements of a scale model ship as well as numerical results of our previous work, which adopted the magnetic charge method in conjunction with material sensitivity analysis.
Sponsorship	IEEE Magnetics Society
Starting Page	4169
Ending Page	4172
Page Count	4
File Size	259239
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic materials Sheet materials Sensitivity analysis Inverse problems Magnetic moments Marine vehicles Magnetization Information analysis Magnetic analysis Materials testing sensitivity analysis magnetic field measurement magnetostatics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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