Low-Frequency EM Field Penetration Through Magnetic and Conducting Cylindrical Shields
Morgan, Michael A.
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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.
Approved for public release, distribution unlimitedSee also ADM001846, Applied Computational Electromagnetics Society 2005 Journal, Newsletter, and Conference., The original document contains color images.
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