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광학거울 시스템의 지지구조 설계를 위한 라그랑지 방정식과 최적화 기법 적용에 의한 효과분석
김학인,남병욱,김광태,김병운,Gimm, Hak In,Nam, Byoung Uk,Kim, Gwang Tae,Kim, Byung Un 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.3
The support structure of an optical mirror system is the one of the important design elements because the one affects the optical aberrations of the mirror surface. In this paper, Lagrange equation of the moving body of the fast steering mirror system(FSM) has been formulated to use with optimization design. Major goals for optimization are to assign the reasonably flexible stiffness to the structure and to enhance the first natural frequency of the mirror and support system in aid of more affordable control bandwidth for the FSM. Pursuing these purposes with the proposed method, the finite element analysis(FEA), optimization technique and the Zernike polynomial estimation are used for the design effects. It is concluded that the proposed approach for design well guides toward the desired design goals with regards to both structural and optical performances.
상호 대국의 안테나 간 자동 추적 지향 기법 및 장치 연구
김학인,조성훈,이종효,Gimm, Hak In,Cho, Sung Hoon,Lee, Chong Hyo 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.5
The existing mobile antenna networks in the military use have been operated by the manual pointing between two antennas. The work presented here describes the study of ATPC(Automatic Tracking and Pointing Control) system between facing antennas and the related tracking and pointing performances. This system is able to automatically track the maximum RSSI(Received Signal Strength Indication) value from the source's RF(Radio Frequency) signal and then control for maintaining the LOS(Line of Sight) between two antennas. The system has three major units; the driving unit consisting of motors, harmonic drives and encoders, the sensor unit with a GPS(Global Positioning System) and AHRS(Attitude and Heading Reference System) and the control unit regulating all the tracking and pointing events. By using PI(Proportional and Integral) controller, this system is able to properly track and point the other antenna under the external disturbance like the wind load. Both the simulation and the experimental works have been successively carried out to prove the performances of the system.
강국정,김학인(Gimm Hak Inn) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
The concept of soft recoil mechanism is to accelerate the recoiling parts forward prior to the firing and to fire the round when the forward momentum of the recoiling parts is attained for the required level. The conventional recoil mechanism for the gun is to provide the retarding force acting on the gun so as to brake the reward motion in the firing cycle. In recent years, the concept of the soft recoil mechanism has been developed. The soft recoil mechanism is introduced for reducing the firing shock and the reaction force due to the forward momentum of the recoiling parts prior to the firing. This paper is to analyze the theory of the soft recoil mechanism and to demonstrate the feasibility for the realistic application for a large caliber gun system. To do this, the numerical simulations for the recoil dynamics and the shock response analysis have been approached.
주재현,김학인,구만회,박지우,Joo, Jae-Hyun,Gimm, Hak-In,Koo, Man-Hoi,Park, Jee-Woo 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.5
A numerical analysis for the space frame structure under ballistic and blast loads was performed using LS-DYNA, a commercial code. The space frame structure was developed to be adapted to the ground vehicle in the future and it was designed to build with Al7039 frames and lightweight multi-layered panels for the purpose of weight reduction and shock mitigation. The analyses have done for side impacts by a cylindrical projectile and Comp. C-4 explosive representing major threats to the vehicle. The deformed shape of the panel section and stresses as well as accelerations of the frames calculated from LS-DYNA were compared to the test results to validate the analysis model. The internal energies for panels and frames from LS-DYNA were also compared to each other to discern their role in absorbing the ballistic and blast impact.
구만회,이창현,김학인,우호길,Koo Man-Hoi,Lee Chang-Hyun,Gimm Hak-In,Woo Ho-Gil 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.1
In order to evaluate the credibility of the welded joint design for combat vehicle using A12519, the numerical analysis for the joint model has been studied and the results are compared with the experimental works by the impact projectiles. The numerical approach using LS-DYNA involves the process of the crack initiation and propagation as well as the applications of the failure criteria for both the ductile and brittle failures. The good agreement between the numerical and experimental works are proved.
실험계획법 및 메타모델 기반의 순차적 근사 최적화 적용 사례 연구
차기업(Cha Ki Up),김학인(Gimm Hak In),강대오(Kang Dae Oh) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
탄두내장형 탄약(CTA, Cased Telescoped Ammunition)과 회전식약실(Rotating Chamber)을 적용한 탄두내장형 탄약 발사장치(CTA GUN)의 운영과 작동은 탄의 장전과 추출이 원활히 이루어져야만 달성될 수 있게 된다. 회전식약실의 경우 테이퍼가 있는 기존의 고정식약실과는 달리 직선형 내경을 갖고 있기 때문에 원활한 탄피 추출 기능을 확보할 수 있는 체계적 분석 방안과 설계절차의 정립을 필요로 하게 된다. 본 연구에서는 원활한 탄피 추출 기능이라는 정성적 기준을 체계적 분석에 적합하도록 수치적으로 평가하기 위해 탄피 추출력을 성능지수로 설정하여 탄피 추출력이 최소화되는 설계조합을 산출하는 것을 목표로 하였다. 설계변수의 경우 회전식약실과 탄두내장형 탄약의 여러 형상 치수와 물성치가 될 수 있으며, 설계변수와 성능지수간 명시적 관계가 수립되어 있지 않기 때문에 각 설계변수 조합하에서 성능지수를 확인할 수 있도록 유한요소 모델을 구성하였으며 실험계획법을 기반으로 다수의 설계변수가 성능지수에 미치는 효과 및 영향을 분석하였다. 이후 효과분석을 위해 추출된 실험점을 초기점으로 한 메타 모델을 구성한 후 최적화 알고리즘을 적용하는 순차적 근사 최적화(SAO, Sequential Approximate Optimization) 기법을 적용하여 탄피 추출력이 최소화 되는 설계안을 도출할 수 있었다.
A Study on Analysis and Experiment of Composite Overwrapped Barrel
Ahn Sang Tae(안상태),Gimm Hak In(김학인),Kang Kuk Jung(강국정) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
SAFE is the abbreviation of operational procedure of weapon systems; see, aim, fire and eliminate. Reduction of weight of weapon systems helps obtain better performance on the steps of "aim" and "fire" out of the four steps. High strength steels have been normally used for conventional large caliber weapon systems. For the purpose of lightweight large caliber weapons, various materials could be concerned such as aluminum alloys, titanium alloys and advanced composite materials. By using composite materials for gun tubes, some benefits could be achieved. First, it basically helps reduce the overall weight of the weapon system as well as that of the gun tube itself. Second, smaller drive systems may be used. Third, better aiming accuracy could be achieved. As the first stage of the development of full scale gun tube with composite materials, a subscale thick-walled cylinder was manufactured and tested.
이민욱(Minuk Lee),이진민(Jin Min Lee),구만회(Man Hoi Koo),김학인(Hak In Gimm),이태희(Tae Hee Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Shock attenuation performance of panels and frame structures with joints are investigated by ballistic impact test. Ballistic impact specimen consists of impact panel, supporting frame structures and connecting joints of frame structure. Ballistic wave from the impact panel propagates to the frame structures. Then the propagated wave can pass by joints because each frame is connected by joints. In this study, we have investigated two kinds of joints such as bolt joint and weld joint. We measure accelerations on before joint and after joint when the wave propagation pass by the joint. Since the ballistic impact is very high frequency loading, broad frequency ranges are measured. Based on the experimental study, we evaluate the ballistic shock attenuation performance of joints by comparing the maximum acceleration and shock response spectrum (SRS) before and after joints.