Direct computation of static difference magnetic field in nonlinear magnetic materials and application to shape reconstruction of damaged areas in aging materials

• Published in: IEEE transactions on magnetics Vol. 38; no. 2; pp. 1073 - 1076
• Main Authors: Cranganu-Cretu, B., Hantila, F.I., Preda, G., Zhenmao Chen, Miya, K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.03.2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Aging; Applied classical electromagnetism; Computer simulation; Electromagnetism; electron and ion optics; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Green function; Inverse problems; Magnetic analysis; Magnetic field measurement; Magnetic fields; Magnetic materials; Magnetism; Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems; Material properties; Neural networks; Nonlinearity; Physics; Polarization; Reconstruction; Solvers; Yokes; Magnetostatics; Nondestructive testing; Neural networks; Digital simulation; Theoretical study; Nonlinearity; Magnetic fields; Eddy current testing
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.996275

In order to accurately compute the magnetic field variation due to changes in material properties (e.g. material aging), we propose a technique that computes the difference magnetic field directly. Nonlinear materials are analyzed by means of the polarization technique. The linear field problem is solved using a fast Green function approach. A two-dimensional formulation is validated upon comparison with measurement data. Then, it is used as fast forward solver for a neural network approach to the inverse problem of reconstructing the shape of the aged material area in a plate. Finally, results of reconstruction, based on 500 case database simulations of a yoke and plate geometry, are presented, indicating the good quality of the reconstruction.