Quantitative evaluation of material degradation parameters using nonlinear magnetic inverse problems

Issue title: Proceedings of the twelfth International Symposium on Interdisciplinary Electromagnetic, Mechanic and Biomedical Problems, ISEM Bad Gastein

Article type: Research Article

Authors: Kojima, Fumio^{a; *} | Fujioka, Toshiya^a

Affiliations: [a] Department of Mechanical and Systems Engineering, Graduate School of Science and Technology, Kobe University, Kobe, 657-8501, Japan

Correspondence: [*] Corresponding author. Tel./Fax: +81 78 803 6493; E-mail: [email protected]

Abstract: New assessment strategies for degradation of magnetic materials are presented. Applying current with low frequency to a probe with magnetic yoke, the detecting signal can be measured by pick-up coil attached with the probe. An inspection model is described by a nonlinear Euler equation in two dimensions with the state dependent magnetic permeability. Inverse analysis for magnetization process is developed with the background knowledge of the inspection model driven by the nonlinear magnetic permeability.

Keywords: Nondestructive testing, material degradation, inverse problems, parameter estimation

DOI: 10.3233/JAE-2007-859

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 157-163, 2007