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이기수,안준모,채제욱,Lee, Kisu,Ahn, Joon Mo,Chae, Je-Wook 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.4
With the development of weapon systems by mounting various sensors, it makes important to analyze the precise functioning of sensor to external environment. In the case of small arms with magnetic sensor, the malfunction of small arms might be caused by strong external magnetic fields. In this study, the effects of magnetic sensor on external magnetic fields were analyzed, and optimal magnetic shield and shield structure were designed through M&S. In addition, the magnetic-shielding effectiveness of magnetic sensor in small arms was verified with commercial shielding materials. As a result, it was demonstrated that the Fe-Cu-Si-Nd-B with the structure of multi-layer metallic shields was shown the magnetic-shielding effectiveness of 83 % for an external permanent magnet and 19 % for an alternating magnetic field of 180 dBpT at 60 Hz, respectively.
효율적인 다물체 동역학 해법 및 인공위성 전개장치에의 응용
이기수(Kisu Lee),김진철(Zeen Chul Kim) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
Solar arrays and antennas of the satellite are usually stowed within the dimensions of the launch-vehicle fairing and deployed in the orbit. To solve such multibody dynamic problems, differential equations and algebraic equations are simultaneously solved, and special solution techniques are required. In this paper, Lagrange multipliers associated with the constraints are iteratively computed by monotonically reducing an appropriately defined constraint error vector, and the resulting equation of motion is solved by a well-established ODE technique. Deformable bodies as well as rigid bodies are treated, and applications to satellite solar arrays are explained.
고속전철 차량 급전기의 접촉 분리를 고려한 동역학적 해석
이기수(Kisu Lee),김영권(Young Kwon Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
For the dynamic analysis of the pantograph of a high speed-electrical train, the contact between the pantograph and the electrical cable is considered with specially defined error vectors. The contact conditions are imposed by augmented Lagrange multiplier method. For the stability of the solution it is shown that the acceleration constraint as well as the velocity and displacement constraints are essential on the contact point. It is also shown that the Coriolis and centripetal accelerations are essential for computing the contact point acceleration.
[구조강도부문] 유한요소법을 이용한 자동차 엔진 밸브의 동역학 및 응력해석
박상호(Sangho Park),이기수(Kisu Lee),김영권(Youngkweon Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
This paper presents numerical analysis of dynamic contact and stress developing in the high-speed driven valve of an internal combustion engine. The valve is modeled by finite element techniques, and the dynamic contact between the valve and the valve seat is analyzed by the solution strategies of differential algebraic equations. It is shown that the contact and separation between the valve and the valve seat can be computed by the finite element techniques without assuming the artificial springs. Also ABAQUS program is used for comparison
서욱환(Wookhwan Seo),이기수(Kisu Lee),좌민영(Minyoung Jwa),김은지(Eunji Kim),강남우(Namwoo Kang) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
Recently, due to the increase in the supply of automobiles and the issue of accidents, interest in the safety rating of automobiles is increasing. Currently, KNCAP for domestic consumption, reinforced NCAP and IIHS for North America, Euro NCAP for Europe, and CNCAP for China are used as safety rating standards. The problem is that the vehicles currently being developed are being developed to achieve the highest level of vehicle safety in all regions. This is an inefficient strategy that does not take into account various characteristics such as sales regions, market trends, safety regulations, and vehicle types/classes. The purpose of this study is to construct two models, an expert-based model and a market-based model, to calculate an efficient safety rating index in consideration of marketability, regional characteristics, and profitability. It is to suggest a rational and strategic vehicle development direction.