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동적 거동을 이용한 연식주퇴장치의 주퇴력 저감 기법 연구
유삼현,이재영,이종우,조성식,김주희,김인수,임수철,Yoo, Sam-Hyeon,Lee, Jae-Yeong,Lee, Jong-Woo,Jo, Seong-Sik,Kim, Ju-Hee,Kim, In-Su,Lim, Soo-Chul 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.4
The future combat system is likely to be studied and developed in terms of enhancing both firepower and mobility simultaneously. Increased firepower often necessitates a heavier firing system. In return, the body of the vehicle needs to be light-weight in order to improve the mobility of the whole system. For this reason, in the areas of weapons systems such as the tank and self-propelled artillery, a number of studies attempting to develop designs that reduce recoil force against the body of the vehicle are being conducted. The current study proposes a tank construction that has a mass-spring-damper system with two degrees of freedom. A tank structure mounted with a specific soft recoil system that was implemented using a soft recoil technique and another tank structure based on a general recoil technique were compared to each other in order to analyze the recoil forces, the displacements of recoil, and the firing intervals when they were firing. MATLAB-Simulink was used as a simulating tool. In addition, the relationship between the movement of the recoil parts and the positions of the recoil latches in each of the two structures were analyzed. The recoil impact power, recoil displacement, firing interval, and so on were derived as functional formulas based on the position of the recoil latch.
LQR 기법을 이용한 로봇다리의 다중입력 유압시스템 제어에 관한 연구
유삼현,임수철,Yoo, Sam-Hyeon,Lim, Soo-Chul 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.4
In the near future, military robots are likely to be substituted for military personnel in the field of battle. The power system of a legged robot is considerably more complex than the one used for a land vehicle because of the coordination and stability issues due to the large number of degree of freedom. In this paper, a servovalve-piston combination system for a straight-line motion of robot leg is modeled as three degree of freedom based on double inputs and single output transfer function. The output is the displacement of piston from neutral. The inputs are valve displacement from neutral and arbitrary load force in this system. LQR(Linear Quadratic Regulator) technique is applied in order to achieve robust stability and fast responses of the system. The Kalman filter loop, rejection of disturbance and noise, riccati equation, filter gain matrix, and frequency domain equality are analyzed and designed.
유삼현,정동윤,오명호,신내호,남석현,Yoo, Sam-Hyeon,Chung, Dong-Yoon,Oh, Myoung-Ho,Shin, Nae-Ho,Nam, Suk-Hyun 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.3
A gun barrel of infantry fighting vehicle is supported like a type of cantilever. Temperature of a gun barrel is increased by heat transfer due to the combustion of propellant charge during the firing. Thus, the muzzle of a gun barrel is deflected in accordance with its temperature and the accuracy rate is decreased by deflection of the muzzle. In this study, deflection of a gun barrel is estimated by measuring its restoration rate because measuring the deflection rate is difficult due to the vibration of the gun barrel during the firing. In order to obtain the relations between deflection rate and restoration rate of the 40mm gun barrel of Next Infantry Fighting Vehicle(NIFV) under varying temperature, measurement of deflection rate and restoration rate is carried out using 5.56mm Remington rifle barrel. Effect of the estimated deflection rate of a gun barrel of NIFV on the hit probability is also analyzed.
무기탑재 전투차량의 임무부하분석을 위한 OMS/MP 방법론과 적용 연구
유삼현,이종우,이민형,이승민,장명언,Yoo, Sam-Hyeon,Lee, Jong-Woo,Lee, Min-Hyung,Lee, Seung Min,Jang, Myeong-Eon 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.1
To obtain the requirements of capability and analyze mission loads for weapon systems which are in process of development, Operational Mode Summary/Mission Profile(OMS/MP) should be documented in advance. In this paper, we have proposed a systematic and practical OMS/MP model processes of a weapon mounted combat vehicle for analyzing power and energy strategy. The wartime and peacetime OMS/MP of a hybrid wheeled combat vehicle which is mounted with an anti-tank guided weapon(ATGW) is also presented as its application.
임수철,유삼현,Lim, Soo-Chul,Yoo, Sam-Hyeon 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.6
Future Combat System(FCS), such as unmanned systems that reduce the danger faced by soldiers in the field, are likely to be studied and developed. Soldiers when finding and disposing of mines risk injury and death. Several methods of safe mine retrieval are investigated. In this paper, a mine removal method, which uses a remote controlled robot to get rid of mines using a 4 channel architecture teleoperation method is used. The robot, when in contact with soil and mines, is controlled by a remote control. The feasibility of using teleoperation controlled system to remove mines is demonstrated in this paper. The Matlab-Simulink was used as a tool to simulate mine removal with robots. The force and position of the robot{slave system of 4 channel architecture) and controller(master system of 4 channel architecture) are analyzed when users handle the controller with sinusoidal force.
유한요소법을 이용한 원자로 상부헤드 CRDM 관통노즐 J-Groove 보수용접 영향 분석
김주희(Ju Hee Kim),유삼현(Sam Hyeon Yoo),김윤재(Yun Jae Kim) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.6
국내 가압경수로형 원자로의 압력용기 상부헤드에는 많은 제어봉구동장치(CRDM) 노즐이 분포한다. 이들 노즐은 억지끼워맞춤(Shrink fitting) 방식으로 결합되어 용접 처리 된다. 용접에 의해 발생되는 인장잔류응력은 일차수응력부식균열을 발생시키는 주요 요인이다. 이러한 이유로 최근 15 여 년 동안 관통노즐 용접부 부위에서 균열 발생 사례가 증가하고 있으며, 이를 극복하기 위해 다양한 방안이 모색되고 있다. 또한 용접과정에서 발생되는 불필요한 결함은 일차수응력부식균열(PWSCC)을 가속화 시키는 원인이 되기도 한다. 원자로 제작과정에서 용접에 의한 결함은 보수용접에 의해 즉시 수리가 이루어 진다. 기존의 연구에서는 정상적인 용접과정에서 발생되는 잔류응력을 예측하였으나, 본 연구에서는 용접과정에서 발생되는 결함을 보수하기 위해 실시되는 보수용접이 용접잔류응력에 미치는 영향을 분석하였다. In pressurized water reactors, the upper head of the reactor pressure vessel (RPV) contains numerous control rod drive mechanism (CRDM) nozzles. These nozzles are fabricated by welding after being inserted into the RPV head with a room temperature shrink fit. The tensile residual stresses caused by this welding are a major factor in primary water stress corrosion cracking (PWSCC). Over the last 15 years, the incidences of cracking in alloy 600 CRDM nozzles have increased significantly. These cracks are caused by PWSCC and have been shown to be driven by the welding residual stresses and operational stresses in the weld region. Various measures are being sought to overcome these problems. The defects resulting from the welding process are often the cause of PWSCC acceleration. Therefore, any weld defects found in the RPV manufacturing process are immediately repaired by repair welding. Detailed finiteelement simulations for the Korea Nuclear Reactor Pressure Vessel were conducted in order to predict the magnitudes of the repair weld residual stresses in the tube materials.
장사거리 탄약 사격훈련을 위한 포병 사격장 입지조건 연구
박지일(Ji-il Park),유삼현(Sam-Hyeon Yoo),이종우(Jong-Woo Lee),김주희(Juhee Kim) 육군사관학교 화랑대연구소 2018 한국군사학논집 Vol.74 No.1
The purpose of this research is to analyze the location requirments of Artillery firing range. To this end, we selected several representative firing range and analyzed their capability and constraint. We considered not only the conventional ammunitions, but also state-of-art ammunitions such as a 155㎜ hybrid ammunition and new Multiple Launched Rocket System ammunition. Based on the analysis result, we could derive essential requirements for the long-distance fire range. But in reality, there are so many limitations to construct an artillery firing range in South Korea. This is attributed to the fact that many local residents oppose strenuously due to the potential hazard of artillery shell such as noise, accidental firing, decrease of land price. Thus, we can arrive at a conclusion that it is virtually impossible to satisfy all requirements for the optimal firing range for the long-distance fire training due to the budget for purchase of safety area and compensation for residents. Thus we propose alternative ways such as a naval firing range or mobile harbor type firing range by using Jack-up barges.
온도 측정과 분석을 통한 40 mm 장축공동실린더의 열적특성 고찰
신내호(Naeho Shin),정동윤(Dong-Yoon Chung),오명호(Myoungho Oh),유삼현(Sam-Hyeon Yoo),남석현(Seok-Hyun Nam) 한국트라이볼로지학회 2006 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.22 No.4
A simple and effective analysis method is presented for gaining a complete transient temperatures on the internal and external surfaces of a 40 mm gun tube subjected to a series of rapid firings. Two series of temperature data for both Hs and As were measured by using two rapid response k-type surface thermocouples near the firing origin and the muzzle. With other available temperature data, patterns of temperature variations of the gun tube as a function of time variable were driven through complete evaluations of the data. It is found that overall temperature gradients which increase exponentially toward saturation temperature, actually consist of a series of linear temperature gradients corresponding to the firing sequences. Under the similar firing sequences, patterns of temperature variations for both the surface temperatures near the chamber and those near the muzzle were found to have linear temperature gradients with different values and the same response frequencies, i.e. they had peaks and lows in emperatures at the same time. The resultant complete temperature data can be used as the fundamental bases for analysis of thermoelastic properties of the materials such as thermal strian and stress, and for the prediction of cannon tube life-time through calculation of wear rate.