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Flash D 탈자방법에서 수직자화예측을 위한 초기자화율에 관한 검토
김영학,도재원,Kim, Young-Hak,Doh, Jaewon 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5
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.
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정현주(Hyun-Ju Chung),배기웅(Gi-Woong Bae),양창섭(Chang-Seob Yang) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.3
There is the Flash-D demagnetization method as conventional demagnetization method for a naval ship without a degaussing system. It is the method for reducing magnetic fields from the ship as obtained the reverse permanent vertical magnetization (PVM) that counteracts the induced vertical magnetization (IVM) in the target ship due to the earth’s magnetic field. However, it is a little difficult to use in a real ship because it involves three-stage protocol and the procedure is also very complex. Therefore, in this paper, we propose the Flash-KD demagnetization method configured with two-stage demagnetization protocol for enhancing the difficulty in a practice of the conventional Flash-D demagnetization method. In the first stage of Flash-KD method, we obtain a very strong PVM. In the second stage, we gain the wanted PVM for compensating the IVM with minimization of a permanent longitudinal magnetization as adjusting the value of a horizontal start field and the total applied field number of the second stage. The proposed method has been applied to a scaled model ship to verify the performance. As a result of that, we could determine successfully the protocol which can remove VM.
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