http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
주원경(Wonkyung Joo),송정일(Jungil song),최환석(Hwansuk Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Considering diverse needed conditions, so far many materials have been studied as materials of bipolar plate for the fuel cell. At the first, plate which was made from graphite flat board having channel is that manufacturing cost of channel is high and due to the high brittleness, it is hard to reduce the thickness of plate. On the case of using a metal like stainless steel, there are some disadvantages such as high material density, high manufacturing cost and corrosion. To make a completion of disadvantages, we are researching on a carbon conductive polymer composite material. A carbon conductive polymer composite material has advantages like taking low-cost manufacturing and making light weight and reducing the manufacturing time. And due to using polymer fiber, higher ductilities is possible. On account of the fact that PEMFC is working on low temperature (approximately 80℃) comparing with other fuel cell plate, carbon conductive polymer composite material can be used for the plate. On this study, the goals are of establishing the manufacturing process of carbon conductive polymer composite material which is used for PEMFC and examining of mechanical characteristics of carbon conductive polymer composite material having superior electrical conductivity according to the change of fillers and forming conditions. And compression molding technique was used for processing, and graphite powder and carbon fiber was used as fillers. As a result of the research, through the optimization of molding conditions using compression molding technique I made carbon conductive polymer composite material for fuel cell plate having superior electrical conductivity which is up to 180 S/㎝. on the case of powder/epoxy composite material, according to the increasing forming pressure, electrical conductivity and bending strength were increased and optimal forming pressure was 1000~1500psi that carbon powder's degree of fineness was fully made. Maximum impact load and absorbing energy of carbon fiber reinforced composite material were better than those of graphite powder/epoxy composite material. This shows that degree of fineness was fully made and strength was increased.
강상자형교 T-Joint 용접부에서 피로수명을 고려한 이음형상에 관한 연구
주원경(WonKyung Joo),김대근(DaeKeun Kim),송정일(JungIl Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This study is to find out characteristics of fatigue failure on the joint configuration of the bridge of steel box girder and evaluate feasibility of design standards of equivalent weld leg length. Stress behavior at non load and load carrying T-joint and mechanical characteristics are evaluated by using Finite Element Method to select design standards of equivalent welding leg length Results are as follows. Welding heat input of T-joint decrease fillet welding, complete penetration, and partial penetration. but margin of the HAZ's size by welding heat input is very slight. Maximized tensile residual stress of weld line direction on T-joint of welding bridge is the level of yield stress in base metal. Tensile residual stress and compressive residual stress decrease fillet welding, fully weld penetration and partial welding in that order. But stress distribution of weld line direction is not concerned of the fatigue behavior on the fillet weld area.
Mini-Tab을 이용한 D-Tube 확관 최적 공정 설계
주원경(WonKyung Joo),권용구(YongGu Kwun),배성인(SungIn Bae),송정일(JungIl Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The purpose of this study is to find the optimization processing on expanded tube using Taguchi method which was generally used to analyze the effects of various control factors. Mini-Tab is a good for program that is making a selection using Taguchi method. The results of experimental test and analysis are as follows. Optimization processing on a expanded tube is dependent on lubrication condition. The slight eccentricity of expanded tube was obtained a good results on the expanded tube. When expending processing on the expanded tube was performed, the test specimens were almost unaffected by changing pressure loading. The tendencies of test results were related to lubrication condition and eccentricity in expending processing. As a result, a proper lubrication condition and eccentricity in the step of design will improve the optimization processing of expanded tube.
주원경(WonKyung Joo),권용구(YongGu Kwun),배성인(SungIn Bae),송정일(JungIl Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The purpose of this study is to analyze the important loads related with crack-growth in aircraft. Al Alloys mainly used in aircraft are Al2024 and Al7075 in Duralumin. In random fatigue loading, it has been understood crack-growth characteristic using fractured surface photograph by SEM. In order to obtained CTOD, we measured a crack size in wing frame part. As a result of fatigue experiment that accumulating plenty of fatigue loadings, we find more cracks than that produces in the same fatigue loading. The important loads relating to crack-growth was found in the largest strain cycle. Applying strain block in fatigue experiment, it is actually loading in connection of aircraft. In conclusion, These results can be used for preventing an accident owing fatigue-fracture in aircraft.
박민수(Minsu Park),임재식(Jae-Sik Lim),김민수(Minsu Kim),김상욱(Sanguk Kim),최종성(Jongsung Choi),송정일(Jungil Song) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.1
This study focuses on the control of a robot manipulator that implements the operation of a landmine detection system that can be mounted on a tactical vehicle. Mine detection uses height control and pitch control drives that follow longitudinal changes. Through this, the probability of detection is increased by maintaining a constant height while the depth of burial is unknown. In this study, the final performance of the controller was confirmed through theory, performance design, performance simulation, manufacturing and testing. The differentiation of this study is that a roll-controlled driving device was used to follow the transverse direction in addition to following the longitudinal surface change. The roll driving device helps improve practicality by helping to set the initial value of the sensor and simplifying portability when moving vehicle. It is believed that further research will be able to follow the lateral changes of the surface.