Modelling Eddy Current Effects for Degaussing Systems

Master thesis (2021)

Authors

M.C. Mascini Electrical Engineering, Mathematics and Computer Science

Contributors

A.R.P.J. Vijn Mathematical Physics - EEMCS (mentor)
E.S.A.M. Lepelaars Mathematical Physics - EEMCS (graduation committee member)
A.W. Heemink Mathematical Physics - EEMCS (graduation committee member)
M.B. van Gijzen Numerical Analysis - EEMCS (graduation committee member)
Faculty
Electrical Engineering, Mathematics and Computer Science, Electrical Engineering, Mathematics and Computer Science
Copyright: © 2021 Merlijn Mascini
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Published Date

29-07-2021

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

Eddy currents are currents which are induced in a conducting object by a varying magnetic field. These currents generate a magnetic field of their own. Modelling this phenomenon constitutes a diverse and challenging set of problems, for which many applications exist. One such application is the degaussing system of a naval ship. To guarantee safety on missions, a ship uses a degaussing system to reduce its magnetic signature. Being able to model the effect of eddy current fields is necessary to improve the accuracy of future degaussing systems.

This thesis will examine how eddy current effects can be modeled, and how such a model can be validated. An analytical solution for a sphere is derived and investigated. A boundary element method (BEM) is implemented, which is able to numerically approximate the electromagnetic fields in terms of the modified magnetic vector potential A* and the reduced magnetic scalar potential. The approximation using the BEM is compared to the analytical solution. The BEM shows promising results, being able to model the shape of the magnetic signature of a sphere accurately. The model is also applied to more realistic geometries resembling naval ships, making it a strong candidate for further development and potential implementation in a future degaussing system.

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