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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magnetic field simulator and the measurement system in the non-magnetic laboratory which is replacing the existing outdated facility.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.
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.
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.
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.
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.
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.
능동형 자기센서의 송신출력 향상을 위한 송신기 설계에 관한 연구
정현주(Hyun-Ju Chung),양창섭(Chang-Seob Yang),전재진(Jae-Jin Jeon) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.5
A active magnetic sensor has been widely used in the underwater guided weapon system because it is able to detect a target accurately in close range, but the target doesnt have any good countermeasure to overcome the threat from the active magnetic sensor. Recently, in order to increase the damage area of target by shock wave with explosion of the underwater weapon system and to detect small target, the maximum target detection range of the active magnetic sensor needs to be increased. One method for improving maximum target detection range is to improve output power from transmitter through demagnetization factor minimization of a transmitting core. Thus, in this paper, we describe the study results on the transmitter core shape design to enhance output power of the active magnetic sensor.
정현주,양창섭,정우진,Chung, Hyun-Ju,Yang, Chang-Seob,Jung, Woo-Jin 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.3
This paper describes design and construction results of the measurement system developed on the purpose of measuring properties of AC magnetic field sensors used in the weapon system. The system for measuring the properties of AC magnetic field sensors consist of 3-axis helmholtz coil, signal generator, signal amplifier, sensor data acquisition unit and AC magnetic field sensor property measurement & analysis equipment including the operating software. By using this system, we can measure various properties of AC magnetic field sensor such as sensitivity, linearity and dynamic response in the frequency from 1 Hz to 10 kHz. Finally we also verified its performance by measuring the property of a MAG 639, standard magnetic field sensor of bartington instruments, with the developed measurement system.