함정의 형상이 탈자에 미치는 영향

Abstract

Since the world warⅡ, many naval vessels are destroyed by sea mine. Sea mine is explosive when sensing a signals generated from naval vessel, which is the acoustic signal, the AC electric field, the AC magnetic field, and the DC magnetic field. What is the final action of sea mine`s percussion lock, which is the DC magnetic field that occurred at the hull of a naval vessel. Therefore, to prevent damage caused by sea mine, naval vessels are have to demagnetization procedure. The demagnetization is reduce vessel`s remnant magnetization at the hull, consequently reduce the DC magnetic field signal generated from naval vessel`s hull. This thesis is deal with investigation about three demagnetization protocols and an effect of the shape of naval vessel for the demagnetization