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Flash Temperature Analysis on the Contact Surfaces between Cam and Roller-Follower Mechanism
구영필,김민남,김남식,Koo, Young-Pil,Kim, Min-Nam,Kim, Nam-Shik The Korean Society of Manufacturing Process Engine 2004 한국기계가공학회지 Vol.3 No.2
The flash temperature distribution on the contact surfaces between cam and roller-follower mechanism was analysed numerically. The elasto-hydrodynamic lubrication pressure and film thickness were used to get the accurate analysis results. The temperature distribution was obtained by numerical integration by making use of Carslaw and Jaeger's formulation to the whole contact surfaces. The maximum flash temperature was increased with both the increasing slip ratio of the contact surface and increasing external load Profile of the temperature distribution was affected by the sliding velocity of the surface.
배대석(Dae Seok Bae),김남식(Nam Shik Kim) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
The Particle Image Velocimetry(PIV) with liquid crystal tracers is used for visualizing and analysis of bubbly flow in a stratified temperature environment. This method allows full field temperature and flow analysis. In the present work, the temperature measurement of bubbly flow is studied by the application of liquid crystal thermometry. The performance of color-to-temperature transformation of the thermochromic liquid crystals is evaluated by using the calibration technique with neural networks. The measured temperature distributions indicate the temperature mixing characteristics of bubbly flow. This paper describes the neural network calibration method, and presents the transient temperature patterns of bubbly flow.
강구에 의한 횡방향 충격을 받는 적층복합판의 충격 응답 거동
김문생(Moon-Saeng Kim),김남식(Nam-Shik Kim),박승법(Seung-Bum Park),백인환(In-Hwan Paik) 한국해양공학회 1993 韓國海洋工學會誌 Vol.7 No.2
본 연구는 강구에 의한 충격을 받는 유리/에폭시 적층복합판의 충격 응답 및 파동 전파 특성을 연구하는데 그 목적이 있다. 이를 위하여 고차전단변형이론에 기초한 동적 유한요소해석을 행하였으며, 저속 및 고속 충격 실험을 행하였다. 동적 유한요소해석으로 부터 접촉력의 변화와 강구의 반발 속도 그리고 충격에 의한 변형률 응답을 구하였다. 변형률 응답은 충격 실험의 결과와 비교하였다. 또한 고속 충격 실험의 결과로 부터 파동전파 속도를 계산하여 파동 전파 이론에 의한 결과와 비교 검토하였다.<br/> 그 결과, 충격 실험에서 구한 변형률 응답은 동적 유한요소해석에 의한 결과의 경향과 잘 일치하였으며, 충격 속도의 증가에 따른 최대접촉력의 증가율은 판의 크기가 클수록 증가하였다. 그리고 파동 전파 속도는 두 결과가 잘 일치하였으며, 접촉시간에 의한 영향으로 강구의 크기가 클 수록 빠르게 나타났다. The purpose of this paper is to analyze the impact response behaviors of glass/epoxy laminated composite plates subjected to the transversely impact of a steel ball. For this purpose, dynamic finite element analysis based on the higher-order shear defomation plate theory is used to compute the contact forces, rebound velocity of a steel ball, and dynamic strain response histories. And low-velocity and high-velocity impact experiments were conducted to compare the results and compute the wave propagation velocities.<br/> The results obtained from impact experiments are in good agreement with those of dynamic finite element analysis. Also the wave propagation velocities obtained from high-velocity impact experiments and wave propagation theory agree well, and wave velocities were higher in the smaller radius of steel ball.
김남식,김장형 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2
In this paper, time, studied about method that can analyze iris change to using differential image of iris image that put interval and films and utilize as patient's health examination according to iris change. Time, Differential image of iris image that put interval and films can be used usefully to search early diagnosis of disease and unfolding process etc.. of disease by showing definitely change by time. In the case of iris diagnostic system, iris outside area extracts iris area and uses Differential image of before filming image and image that film present to use canny edge detector as there is cay to extract iris area as do not help in diagnostic and change analyzed comparison.