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양창섭,정현주,Yang, Chang-Seob,Chung, Hyun-Ju 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.4
This paper describes research results for the measurement and analysis method of magnetic signatures generated from the ship's magnetic mock-up model. In this paper, we present the theoretical and experimental techniques for the separation of the permanent and the induced magnetic field from the measured magnetic signature of the mock-up model. Also, we describe the prediction method of the induced magnetic field generated from mock-up model using the Magnet s/w, one of the FEM analysis tools for the electro-magnetic field and the magnetic dipole modelling method based on the least square techniques. The proposed modelling and analysis methods can be used for the prediction and the analysis of the static magnetic field generated from the real naval ship as well as the mock-up model.
양창섭,정현주,신승제,Yang, Chang-Seob,Chung, Hyun-Ju,Shin, Seung-Je 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.2
The underwater electromagnetic signatures of a naval ship are mainly generated from three sources which are the permanent and induced magnetic field in the ship's hull and other ferrous components, the cathodic current electromagnetic field established by the Impressed Current Cathodic Protection(ICCP) system or the Sacrificial Anode and the stray electromagnetic fields generated by onboard equipment. These signatures can be minimized by certain design methods or installation of signature reduction equipment. In this paper, we represented the characteristic of the underwater electromagnetic signature and the signature reduction techniques for a naval ship. Also, we measured the electromagnetic field changes emitted from the real ship using the Electric and Magnetic field Measurement System(EMMS). We found that the underwater electromagnetic signature for a naval ship can be used as input or trigger signal in a surveillance system and an influence mine.
지구자기장 시뮬레이터를 이용한 모델 함정의 자기신호 분석 기법 연구
양창섭,정현주,전재진,Yang, Chang-Seob,Chung, Hyun-Ju,Jeon, Jae-Jin 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.4
Since 1990, Agency for Defense Development is operating the non-magnetic laboratory for the development of key technology for the underwater magnetic stealth part, the research of the magnetic application weapons and the technical support for Korean Navy. Recently, we installed the new three-axis earth magnetic field simulator and the measurement system in the non-magnetic laboratory which is replacing the existing outdated facility. In this paper, we deal with the detailed design result of the earth magnetic field simulator and the measurement system. Also, we describe the effective method to separate the permanent and the induced magnetic field from the measured data for a scaled model ship using the earth magnetic field simulator and the measurement system.
다이폴 모델링 기법을 이용한 수중 전기장 신호 특성 예측 기법 연구
양창섭(Chang-Seob Yang),정현주(Hyun-Ju Chung),이종주(Jong-Ju Lee),전재진(Jae-Jin Jeon) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.6
This paper describes the equivalent dipole modeling method utilizing a singular value decomposition technique from analysis data by the FNREMUS Detailled Modeller software based on BEM which can predict the underwater electric field signal due to a galvanic corrosion phenomenon on a naval vessel. The proposed dipole modeling method was successfully verified in good agreement with predicted BEM data at 30 m depths through the comparison of average differences. The proposed dipole modelling method can be effectively used in the prediction and analysis of static electric field signature distributions generated from a naval vessel at any different depths.
양창섭(Chang-Seob Yang),정현주(Hyun-Ju Chung),정우진(Woo-Jin Jung) 한국자기학회 2014 韓國磁氣學會誌 Vol.24 No.4
Since 1990, Agency for Defense Development (ADD) has been operating the nonmagnetic laboratory and the magnetic sensors laboratory to develop the key technology of the ship’s magnetic silencing and to research the high performance magnetic sensors used in the weapon system and to perform the technical support for Republic of Korea Navy. Recently, the main test equipment in the laboratories has been upgraded to improve the measurement and analysis abilities against magnetic target and to evaluate the performance of the magnetic sensors. In this paper, the capability and the current state of magnetic test facilities of ADD are described.
강자성 함정 선체 및 내부 장비에 의한 수중 정자기장 신호 예측
양창섭(Chang-Seob Yang),정현주(Hyun-Ju Chung),주혜선(Hye-Sun Ju),전재진(Jae-Jin Jeon) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.5
Underwater static magnetic field signature for the naval ship has been widely used as the detonating source of the influence mine system because it is possible to make an accurate target detection in the near field although the magnetic field falls off relatively fast with distance in comparison with the underwater radiated noise signal. In this paper, we describe the prediction results about the underwater static magnetic field by the ferromagnetic hull, the internal structures and the main on-board equipment for the target vessel using the commercial FEM software. Also we analyze the degaussing effectiveness for the target vessel through the degaussing coils arrangement.
특이치 분해 방법에 의한 함정 자기원 다이폴 모델링 방안 연구
양창섭(Chang-Seob Yang),정현주(Hyun-Ju Chung) 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.6
This paper describes the mathematical modeling method for the static magnetic field signature generated by a magnetic scale model. we proposed the equivalent dipole modeling method utilizing a singular value decomposition technique from magnetic field signatures by magnetic sensors are located special depths below the scale model. The proposed dipole modeling method was successfully verified through comparisons with the real measured values in our non-magnetic laboratory. Using the proposed method, it is possible to predict and analyze static magnetic field distributions at any difference depths generated from the real ships as well as a scale model ship.
함정의 선체 부식에 의한 수중 전자기 신호 예측에 관한 연구
정현주,양창섭,주혜선,전재진,Chung, Hyun-Ju,Yang, Chang-Seob,Ju, Hae-Sun,Jeon, Jae-Jin 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.2
Corrosion currents flow through the seawater due to the different electrochemical potential between a hull and a propeller under the draft line of ship. Additionally, in order to protect the hull and other sensitive anodic parts of the ship from corrosion, the corrosion protection system, called impressed current cathodic protection(ICCP) equipment has been installed in most naval ships. Those currents could be harmful to the electromagnetic silencing of the naval ship because sea mines are triggered by even a feeble field value. In this paper, we described electric and corrosion related magnetic fields by ship's galvanic corrosion and a corrosion protection system, and prediction results of electric and corrosion related magnetic fields at any depth for the model ship.
김영학,양창섭,신광호,Kim, Young-Hak,Yang, Chang-Seob,Shin, Kwang-Ho 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.1
In this study, we investigated whether the anhysteretic demagnetization process would be applicable to remove a complicated magnetization of a steel tube as a part of the experimental earlier study for a deperming of naval vessel. The magnetic tube used in this study was a 10cm-long and 1cm-diameter steel tube, and magnetized with a E-shape ferrite core to form a nonuniform magnetization in it. In the anhysteretic demagnetization process, a dc magnetic field applied along the longitudinal direction of the tube decreased from ${\pm}$3kA/m to zero-field with the step of ${\pm}$300A/m. At the same time, an ac bias magnetic field with the frequency of 60Hz and the field intensity of 300A/m was excited along the circumstantial direction of the tube. It was found that the anhysteretic process was useful to demagnetize a small-object like a steel tube from the experimental results showing the residual magnetization reduced over 90%.
선체 부식 및 부식 방지장치에 의한 수중 전기장 신호 해석 방안 연구
정현주,양창섭,전재진,Chung, Hyun-Ju,Yang, Chang-Seob,Jeon, Jae-Jin 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.2
The galvanic corrosion of a vessel, or systems fitted to minimize the ship's corrosion such as ICCP (Impressed Current Cathodic Protection) system and sacrificial anodes, can lead to significant electrical current flow in the sea. The presence of vessel's current sources associated with corrosion will give rise to detectable electric field surrounding the vessel and can put it at risk from mine threats. For this reason, it is necessary to design corrosion protection systems so that they don't only prevent a hull corrosion but also minimize the electric field signature. In this paper, we describe theoretical backgrounds of underwater electric field signature due to corrosion and corrosion protection system on naval vessels and analysis results of the electric field according to the ship's hull and it's propeller coating damage and ICCP anode displacement.