Low-frequency EM field penetration through magnetic and conducting cylindrical shields

Author

Morgan, Michael A.

Author_Institution

Dept. of ECE, Naval Postgraduate Sch., Monterey, CA, USA

fYear

2005

fDate

3-7 April 2005

Firstpage

549

Lastpage

552

Abstract

Computation of fields due to a 500 turn coil positioned arbitrarily within a pipe constructed of conducting and/or magnetic material is performed using multi-region cylindrical harmonic modal expansions. Results involving steel and aluminum indicate the relative significance of shielding due to induced magnetization and eddy-current generation. Extension to an arbitrarily oriented coil is being investigated. The goal is to design multilayered structures composed of conducting and magnetic materials for a specified frequency range. Such shields are designed under constraints of layer number, thickness and weight using an evolutionary optimization algorithm.

Keywords

aluminium; conducting bodies; eddy currents; electromagnetic fields; evolutionary computation; magnetic shielding; magnetisation; steel; aluminum; arbitrarily oriented coil; conducting cylindrical shields; eddy-current generation; evolutionary optimization algorithm; low-frequency EM field penetration; magnetic material; magnetic shields; magnetization; multiregion cylindrical harmonic modal expansions; steel; Algorithm design and analysis; Aluminum; Coils; Constraint optimization; Design optimization; Frequency; Magnetic materials; Magnetic shielding; Magnetization; Steel;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Applied Computational Electromagnetics, 2005. IEEE/ACES International Conference on

Print_ISBN

0-7803-9068-7

Type

conf

DOI

10.1109/WCACEM.2005.1469646

Filename

1469646