Low-Frequency EM Field Penetration Through Magnetic and Conducting Cylindrical Shields
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Authors
Morgan, Michael A.
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Advisors
Date of Issue
2005-01
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Abstract
Computation of low-frequency field penetration through magnetic and/or conducting
materials is important for quantifying electromagnetic compatibility issues in devices and
facilities, as well as prediction of field signatures external to ships and submarines due to
internal electrical machinery. A computational procedure is described for accurately
predicting the penetration of low-frequency fields through a cylindrical structure,
possibly arranged in layers. The internal source being shielded is a large multi-turn coil
having arbitrary location within the cylindrical shell. Field computation is formulated
using multi-region cylindrical harmonic expansions with enforcement of continuity on
tangential field components at each material interface. Example field intensities and
shielding are computed for a steel pipe at frequencies of 1 Hz and 1 kHz. The relative
effectiveness of induced magnetic shielding and eddy-current shielding is considered.
Type
Article
Description
See also ADM001846, Applied Computational Electromagnetics Society 2005 Journal, Newsletter, and
Conference., The original document contains color images.
Series/Report No
Department
Electrical and Computer Engineering
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.