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이영빈(Yeong-Bin Lee),곽민호(Min-Ho Kwak),김규홍(Kyu-Hong Kim),이동호(Dong-Ho Lee),정형석(Hyoung-Seong Jeong),장영일(Young-Il Jang),권혁빈(Heyok-Bin Kwon) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
In this study, wind tunnel test were conducted to improve an aerodynamic performance of HEMU400X pantograph system with 4 types of pantograph housing models. Experimental models were 1/4 scaled pantograph system, 1/4 scaled ground plate which is scaled down to real roof shape of HEMU-400x, and 4 types of pantograph housing models. The free stream of wind tunnel were 20, 40, 60, 70m/s. The lift and drag forces were measured with 2-axis load cell. And, Total pressure were measured with rake in the wake region of panhead. In addition, Surface flow visualization by tufts were performed to know flow characteristics around pantograph housing. According to the results of force tests and surface visualizations, pantograph housing shape is important part because the shape affects to pantograph system. Therefore, it is considered that adaption of pantograph housing is more advantageous to decrease drag and acoustic noise.
전석현 ( Jeon Seok Hyeon ),이영빈 ( Lee Yeong Bin ),정정식 ( Jeong Jeong Sik ),하민균 ( Ha Min Gyun ),안진희 ( Ahn Jin-hee ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
Recently, steel has been very frequently chosen in building many civil infra-structures including bridges due to its several beneficial advantages as compared to concrete structures. However, for the most cases, damage such as section reduction, that is resulted from corrosion, was natural and inevitable. Therefore, it becomes very important to evaluate the structural safety and to estimate the life for the worst cases. In this study, the corrosion behaviors of mock-up specimen with box girder were examined by visual inspection.
곽민호(Min-Ho Kwak),이영빈(Yeong-Bin Lee),이정욱(Jung-Uk Lee),김규홍(Kyu-Hong Kim),이동호(Dong-Ho Lee),정형석(Hyoung-Seog Chung),장영일(Young-Il Jang),권혁빈(Hyeok-Bin Kwon) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Wind tunnel tests are performed so as to investigate the aerodynamic drag characteristics of HEMU-400x, next generation Korean high speed train. The experiments of 1/20 scaled 5-car train model are done at 30, 40, 50, 60m/s with a normal bogie, a bogie cover, and a streamlined shape. The flat plate with knife edge are installed to minimize the effect of boundary layer of wind tunnel for the train model. The aerodynamic drag reduction was more by a streamlined shape than by a bogie cover from a normal bogie. Based on the experimental results, the aerodynamic drag of HEMU-400x test train(6-car) was predicted. It is prediceted that More bogie cover could reduce more aerodynamic drag of the test train in replacement of normal bogies.
최적 팬헤드 형상을 가진 팬터그래프 축소모델의 3차원 공력특성에 대한 실험적 연구
노주현(Rho Joo-Hyun),이영빈(Lee Yeong-Bin),곽민호(Kwak Min-Ho),김규홍(Kim Kyu-Hong),이동호(Lee Dong-Ho) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
As the speed increasing of high speed train, the pantograph performances is one of the most important reasons which restrict the maximum safe speed. A pantograph shape generates large vortex shedding, and noise and vibration are due to an unexpected aerodynamic characteristics. For high effective pantograph shape, an optimal panhead shape was selected through the previous research, and wind tunnel experiments were conducted to analyze. The aerodynamic characteristics of pantograph which has the optimal panhead shape were compared with that of the basic shape as the commercial high speed train(KTX-Ⅱ) in korea. Through the test results, the optimal panhead shape leads the improvement in the aerodynamic performance of entire high speed pantograph system.
고속열차용 팬터그래프의 공력저항 및 공력소음 저감을 위한 팬터그래프 팬헤드 형상 전산해석
정성민(Seong Min Jeong),이상아(Sang A Lee),이영빈(Yeong Bin Lee),김규홍(Kyu Hong Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this paper, study of high speed train pantograph panhead shape for aerodynamic drag and noise reduction is performed. In previous research, it is known that pantograph arm and panhead are main sources of noise from high speed train pantograph. Numerical simulation using full scale pantograph model with streamlined cover at knee and optimized cross section of arm are performed for aerodynamic drag and noise reduction. In this study, first, cross section of pantograph panhead optimization are performed. Second, numerical simulation using full scale pantograph model with optimized cross section of pantograph panhead are performed. As a result, Aerodynamic drag and noise are reduced.
엔진룸 하부 배기구 위치 및 크기에 따른 3차원 엔진룸 내부유동 해석
김태경(Tae-Kyung Kim),이주용(Ju-Yong Lee),이영빈(Yeong-Bin Lee),송기선(Song-Ki Sun),이준호(Joon-Ho Lee),이동호(Dong-Ho Lee),김규홍(Kyu-Hong Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, temperature of the engine room has been increased due to the high performance engine. Changing a hood shape for reduction of aerodynamic drag and decreasing the engine room area for passenger’s room extension lead to negative effects of internal flow. As a result, the engine room cooling efficiency is reduced by decreasing volume of engine room and it leads to increase the engine room temperature. Engine room cooling became to one of the essential part for the performance and life cycle of a car. In this study, temperature and static pressure of the engine room with various exhausts, Changing position and exit area, on the undercover was simulated by Computational Fluid Dynamics.
정성민(Seong-Min Jeong),김태경(Tae-Kyung Kim),김정현(Jung-Hyun Kim),이영빈(Yeong-Bin Lee),최중근(Joong-Keun Choi),김규홍(Kyu-Hong Kim),이준용(Jun-Yong Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
현재 서울대에서는 지면모사 풍동의 개발을 준비중이며 이에 앞서 본 논문에서는 지면모사 방법선정을 위한 전산해석 선행연구를 진행하였다. 지면 모사방법 선정연구에 앞서 일반적인 검증문제에 해당하는 Ahmed Body의 전산해석을 수행하여 논문의 실험값과 비교를 하였다. 이를 통해 해석기법 및 정확성을 검증하였고 전산해석 방법을 선정하였다. 그리고 현재 서울대 아음속풍동크기의 전산해석 영역에서 고정지면과 실제 주행조건을 부여하여 해석을 수행하였고, 풍동의 지면모사방법인 Moving belt 기법, Suction 기법 등 지면모사 방법을 달리하면서 전산해석을 수행하였다. 고정지면과 실제 주행조건의 전산해석 결과들과 지면 모사방법을 적용하여 해석한 결과들을 비교하여 각 기법들에 따른 항력계수, 경계층 변화 그리고 공력 특성들을 살펴보았다. 이를 통하여 차량의 지면효과를 고려할 수 있는 풍동제작에서의 지면 모사방법에 대한 방향을 제시하였다.
Active Air Flap을 장착한 차량의 주행저항 및 엔진룸 유동해석
김태경(Tae-Kyung Kim),최중근(Joong-Keun Choi),김정현(Jung-Hyun Kim),조준호(Jun-Ho Cho),이영빈(Yeong-Bin Lee),김규홍(Kyu-Hong Kim),이동호(Dong-Ho Lee),김진필(Jin-Phil Kim),이준호(Jun-Ho Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper describes on numerical studies on improvement of car engine room and aerodynamic drag for CO2 reduction with an active air flap. The numerical models were full scaled car of YF SONATA that has detailed car engine room with active air flaps. An base model of YF SONATA was compared with a change grill model of that which has active air flaps. As a result, the aerodynamic drags were compared depending on the operating conditions and times of active air flap on upper and under grill. An engine room cooling efficiency which were internal temperature, static pressure and stream line was shown according to those flap conditions.