Numerical Simulation and Verification of Magnetic Signatures of Ship Degaussing Coils

doi:10.3969/j.issn.1000-1093.2017.10.015

Abstract

Abstract: As alternative to commercial electromagnetic field finite element analysis software, the ship magnetic software MagShip based on the magnetic moment method (MMM), the multilevel adaptive cross approximation (MLACA) and the graphical processing unit (GPU) with high parallel processing capability has been successfully used in ship magnetic signatures simulation. However, when the magnetic signatures of the ship degaussing coils are analyzed numerically, the mesh of hull structure near the ship degaussing coils would be finely generated. When the software MagShip is used for this kind of large-scale magnetic field modeling, the computational results may be unstable or distorted. In order to solve this problem, the software MagShip was improved for the modelling of the magnetic field signatures of ship degaussing coils. The improvement measures of MagShip are to average the coupling coefficients of the adjacent elements by using several points in the field elements, subdivide the elements near the degaussing coils, and average the magnetizing fields on the elements near the degaussing coils by using several points in the elements. The improved software MagShip was used to simulate several test examples, including the degaussing coils in and outside the thin spherical shells, and the degaussing coil in the submarine hull. The difference between the calculated results of the proposed method and the commercial FEM COMSOL Multiphysics software is about 1%. The result shows that the proposed method can be used to model the magnetic signatures of ship degaussing coils．Key

Key words: electromagnetics, shipmagneticfield, magneticmomentmethod, multileveladaptivecrossapproximation, degaussingcoil

CLC Number:

U665.18

GUO Cheng-bao, ZHOU Wei-chang. Numerical Simulation and Verification of Magnetic Signatures of Ship Degaussing Coils[J]. Acta Armamentarii, 2017, 38(10): 1988-1994.

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