A Boundary Integral Formulation on Unstructured Dual Grids for Eddy-Current Analysis in Thin Shields

Author

Alotto, Piergiorgio ; Guarnieri, Massimo ; Moro, Federico

Author_Institution

Dipt. di Ingegneria Elettrica, Padova Univ.

Volume

43

Issue

4

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

1173

Lastpage

1176

Abstract

A 3-D boundary integral method (3-D BIM) capable of analyzing eddy currents in thin shields is presented. This novel approach is formulated in terms of loop currents in order to implicitly fulfill the div-free condition for quasi-magnetostatic problems. Using nonorthogonal dual grids unknowns are defined on nodes, resulting in a very efficient formulation with limited memory requirements. The proposed method is tested on an axisymmetric model showing a good agreement with the analytical solution. 3-D BIM is then applied to analyze a real case of low-frequency magnetic shielding

Keywords

boundary integral equations; eddy currents; magnetic shielding; magnetostatics; boundary integral formulation; div-free condition; eddy current analysis; low-frequency magnetic shielding; quasimagnetostatic problems; thin shields; unstructured dual grids; Current density; Eddy currents; Finite element methods; Helium; Integral equations; Magnetic analysis; Magnetic shielding; Numerical models; Shape; Testing; Boundary integral method (BIM); cell method (CM); eddy currents; edge elements; shielding;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.890948

Filename

4137658