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http://dx.doi.org/10.4283/JKMS.2017.27.2.063

Analytic Verification of Optimal Degaussing Technique using a Scaled Model Ship  

Cho, Dong-Jin (The 6th R&D Institute - 3rd Directorate, Agency for Defense Development)
Publication Information
Journal of the Korean Magnetics Society / v.27, no.2, 2017 , pp. 63-69 More about this Journal
Abstract
Naval ships are particularly required to maintain acoustic and magnetic silence due to their operational characteristics. Among them, underwater magnetic field signals derived by ships are likely to be detected by threats such as surveillance systems and mine systems at close distance. In order to increase the survivability of the vessels, various techniques for reducing the magnetic field signal are being studied and it is necessary to consider not only the magnitude of the magnetic field signal but also the gradient of it. In this paper, we use the commercial electromagnetic finite element analysis tool to predict the induced magnetic field signal of ship's scaled model, and arrange the degaussing coil. And the optimum degaussing current of the coil was derived by applying the particle swarm optimization algorithm considering the gradient constraint. The validity of the optimal degaussing technique is verified analytically by comparing the magnetic field signals after the degaussing with or without gradient constraint.
Keywords
scaled model ship; underwater magnetic field; optimal degaussing technique; gradient constraint; finite element analysis;
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