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함정에 의해 발생하는 수중 지자계 외란신호 분리방법에 대한 연구
李康珍(Kang-Jin Lee),梁昌燮(Chang-Seop Yang),鄭賢株(Hyun-Ju Jung),金東勳(Dong-Hun Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
Magnetic anomaly generated around a ship is mainly due to the permanent magnetization(PM) and induced magnetization(PM) remaining on the hull. It is very difficult to predict the direction and its magnitude of the permanent magnetization distributed over the hull, that is caused by mechanical or thermal stress. In this paper, an effective method is proposed to separate two components, the one produced by PM and the other by IM, from the underwater earth field signal distorted by the ferromagnetic material of the ship. The method can easily provide the two kinds of magnetic anomaly through exploiting experimental results and 3D electromagnetic field analyses even though the PM distribution on the hull is not known. To validate the proposed method, a model ship is manufactured and tested. The results would be of much help to basis research for securing safe navigation of a ship against dangerous factors in underwater.
최낙선(Nak-Sun Choi),정기우(Gi-Woo Jeung),김동욱(Dong-Wook Kim),양창섭(Chang-Seop Yang),정현주(Hyun-Ju Jun),김동훈(Dong-Hun Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.10
This paper analyzes re-degaussing performances of various breakdown conditions of degaussing coils in a ship to reduce underwater magnetic field anomaly due to the hull magnetization induced under the Earth’s magnetic field. To achieve this, first, it is implemented to optimize degaussing coil currents by a magnetomotive force sensitivity formula combined with the coil effects. The re-degaussing processes are then executed when a breakdown occurs in degaussing coils, one by one. Finally, the re-degaussing performances are examined with the results of normal degaussing and coil breakdown conditions.