Numerical Simulation of Measuring Ship's Induced Magnetic Field by Geomagnetic Field Simulation Method

doi:10.12382/bgxb.2021.0110

Abstract

Abstract: Geomagnetic field simulation method has the advantages of fast measurement speed and convenient implementation, but the measurement accuracy of induced magnetic field is restricted by the uniformity of simulated geomagnetic field, so it is of great significance to study its influence law for popularizing and applying geomagnetic field simulation method. Based on the principle of geomagnetic field simulation method, with the help of COMSOL Multiphysics, an analytical example of an ellipsoidal shell is designed to verify the effectiveness of the simulation platform in analyzing geomagnetic field simulation method to measure induced magnetic field, and then a ship-type example is designed for numerical simulation. The variation law of the accuracy of measuring ship's induced magnetic field by geomagnetic field simulation method affected by the uniformity of simulated geomagnetic field and the influence of bridge structure on the measurement accuracy of induced magnetic field are quantitatively analyzed. The results show that the measurement accuracy of induced magnetic field is better than 90% when the uniformity of simulated geomagnetic field reaches 91%. If the uniformity continues to increase, the improvement effect of induced magnetic field measurement accuracy will slow down and the cost-effectiveness ratio of engineering will decrease. The influence of bridge structure on uniformity evaluation is 0.2%, and the influence degree of induced magnetic field measurement accuracy is 2.7%. When the overall uniformity is higher than 91%, its influence degree drops to 2.5%, so the influence of this structure on measuring induced magnetic field can be ignored. The research conclusion provides a basis for the further popularization and application of geomagnetic field simulation method in practical ship degaussing, and also provides a certain reference for optimization design of geomagnetic field simulation coils.

Key words: ship'sinducedmagneticfield, shipdegaussing, geomagneticsimulationmethod, magneticfielduniformity

CLC Number:

TM153⁺.1

WANG Kaisong， ZHOU Guohua， LIU Yuelin， WANG Yufen， LIU Shengdao. Numerical Simulation of Measuring Ship's Induced Magnetic Field by Geomagnetic Field Simulation Method[J]. Acta Armamentarii, 2022, 43(3): 617-625.

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