The effect of roll and pitch motion on ship magnetic signature

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Authors
  1. Birsan, M.
  2. Tan, R.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
The roll- and pitch-induced eddy currents create a magnetic field that contributes to the total magnetic signature of naval vessels. The magnetic signature is of concern, as it exposes the ship to the threat of modern influence mines. It is estimated that the eddy current is the second most important source contributing to a ship’s underwater magnetic field following the ferromagnetic effect. In the present paper, the finite element (FE) method is used to predict the eddy current signature of a real ship. The FE model is validated using the measurements of the Canadian research vessel CFAV QUEST at the Earth’s Field Simulator (EFS) in Schirnau, Germany. Modeling and validation of the eddy current magnetic signature for a real ship represents a novelty in the field. It is shown that the characteristics of this signature depend on frequency. Based on these results, a ship’s degaussing system could be improved to cancel both the ferromagnetic and the eddy current contribution to the magnetic signature simultaneously, reducing the susceptibility to sea mines.
Keywords
eddy currents;magnetic signature;ship motion effects;ship signature;finite element method
Report Number
DRDC-RDDC-2016-P173 — External Literature
Date of publication
01 Jan 2018
Number of Pages
10
Reprinted from
Journal of Magnetics, vol 21, issue 21, p. 503-508
DSTKIM No
CA045684
CANDIS No
806122
Format(s):
Electronic Document(PDF)

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