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J. KIMS Technol > Volume 17(5); 2014 > Article
Journal of the Korea Institute of Military Science and Technology 2014;17(5):585-590.
DOI: https://doi.org/10.9766/KIMST.2014.17.5.585   
A Study on Intial Susceptibility for the Prediction of Vertical Magnetization in Flash D Demagnetization
Young-Hak Kim, Jaewon Doh
1Department of Electrical Engineering, Pukyong National University
2Maritime R&D Lab., LIG Nex1 Co., Ltd.
Flash D 탈자방법에서 수직자화예측을 위한 초기자화율에 관한 검토
김영학, 도재원
1부경대학교 전기공학과
2LIG넥스원(주) 마리타임연구실
Abstract
A permanent vertical magnetization should be obtained to counteract induced vertical magnetization due to the earth's background field during the Flash D demagnetization process. A vertical susceptibility is needed to calculate a extra-permanent magnetization, which is needed to control the permanent vertical magnetization in stage 2 of Flash D demagnetization and added to the final vertical permanent magnetization. Two susceptibilities were found in this paper. One is obtained from the extra-magnetization. The other is obtained by magnetic field measurement from the scaled physical vessel when the vessel is excited by vertical magnetic field. The initial susceptibility by the extra-magnetization was 0.101~0.109 and the one from the measured magnetic field was 0.122. Two susceptibilities have a good agreement each other. From this paper, it is found that the susceptibility is able to appllied to calculate the extr-magnetization.
Key Words: Flash D Demagnetization, Vertical Initial Susceptibility, Vertical Permanent Magnetization, Earth Magnetic Field, Physical Scaled Model


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