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팬터그래프 커버형상에 따른 HEMU-400X 항력의 실험적 분석
이영빈(Yeongbin Lee),곽민호(Minho Kwak),김규홍(Kyuhong Kim),이동호(Dongho Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The aerodynamic drag characteristics of HEMU-400X which has been being developed for the maximum speed of 430km/h were analyzed experimentally as the variations of the pantograph cover configurations to reduce the acoustic noise and the aerodynamic drag of the pantograph system. The wind tunnel tests were performed with three pantograph cover models upon 1/20 scaled 5-car model of HEMU-400X. Two kinds of wedge shapes which induce up-flow in the vicinity of the pantograph and one cone shape which reduces the whole train drag were used in order to compare the aerodynamic characteristics as the pantograph cover shape changes. The each axial force of 5 each car was measured at a time with the test velocities 30 40 50 60m/s. Through the wind tunnel test the base drag forces of HEMU-400x model and the forces by the pantograph cover on the train model were investigated and the aerodynamic drag characteristics of the train model by the pantograph cover configurations were analyzed.
실험적 연구를 통한 SNU 초소형 비행체 설계 및 개발
이영빈(Yeongbin Lee),김우례(Woore Kim),김규홍(Kyu Hong Kim),김종암(Chongam Kim) 한국항공우주학회 2006 韓國航空宇宙學會誌 Vol.34 No.11
본 논문에서는 일반 항공기의 설계경험식을 이용하여 SNU 초소형 비행체를 개념설계 하고 설계된 내용을 토대로 시제기를 제작하여 반복적인 풍동실험과 비행실험을 통하여 형상을 최적화하였다. 그리고 고효율의 추진시스템을 위해 프로펠러 형상에 따른 추력실험과 반응면기법(RSM)을 이용하여 최적의 프로펠러 형상을 도출하였다. SNU 초소형 비행체는 210mAh 배터리를 장착하였을 경우 17분 이상을 비행할 수 있었으며, 안정성과 조종성면에서 좋은 특성을 가지고 있음을 확인하였다. The SNU MAV has been designed through studies on highly efficient aerodynamic shape and propulsion system. The configuration of the vehicle was determined from conventional empirical equations, iterative wind tunnel tests and flight tests. The propeller shape was optimized with the various thrust tests and RSM(Response Surface Method) to obtain the higher efficient propulsion system. It was certified that the MAV could fly for over 17 minutes with a 210mAh battery. In addition, it showed good flight characteristics in both stability and controllability.
이영빈(Yeongbin Lee),김남균(Namgyun Kim),김상호(Sangho Kim) 한국항공우주학회 2017 韓國航空宇宙學會誌 Vol.45 No.3
본 논문에서는 현재 한국항공우주학회 공기역학부문위원회에서 주관하고 있는 EFD-CFD 비교워크샵의 여러 과제 중 CASE 3 천음속영역 유동해석에 대해 소개하고 현재까지 참여한 기관들의 결과를 서로 비교하였다. 현재까지 이 과제에 대하여 산학연 8개 기관이 참가하였고, 그 결과 풍동실험결과와 비교적 잘 일치하며, 서로의 해석결과 역시 잘 일치함을 알 수 있었다. This paper describes on introduction of CASE 3 for EFD-CFD comparison workshop which is incharged of aerodynamic subcommittee of The Korean Societry or Aeronautical and Space Science. In addition, the results of candidate for CASE 3 were compared with experimental result and computational result. Currently, for this case 3, there are eight candidates from company, university and research institute. According to comparison of their results, they are in accordance with experimental data and computational data.
아음속 유동에서 그리드핀 유도무기의 공력특성 분석을 위한 실험적연구
이영빈(Yeongbin Lee),이창구(Changgu Lee),이종건(Jonggeon Lee),김성철(Sungcheol Kim),김남균(Namgyun Kim) 한국항공우주학회 2021 韓國航空宇宙學會誌 Vol.49 No.9
본 논문에서는 아음속유동에서 그리드핀 유도무기의 공력특성을 실험적연구를 통하여 기술하였다. 그리드핀 형상에 의한 영향을 살펴보기 위해 폐쇄율을 달리한 그리드핀 형상모델을 이용하였다. 공기역학적특성을 살펴보기 위해 그리드핀 포함 유도무기 형상의 6성분 공기역학적 힘과 모멘트를 측정하여 레이놀즈수에 의한 영향, 그리드핀 형상에 의한 영향, 조종성능 등을 알아보았다. In this paper, aerodynamic characteristics of missile configuration with various grid fins in subsonic flow. To investigate the effects of grid fin shape, four types of experimental models were used. In addition, to examine aerodynamic characteristics of missile configurations with various grid fins according to effects of Reynolds numbers and configurations of grid fins, 6-components aerodynamic forces and moments were measured by internal balance in wind tunnel test.
차세대 고속열차(HEMU-400X)의 팬터그래프 시스템에 대한 공력특성 연구
이영빈(Yeongbin Lee),노주현(Joohyun Rho),곽민호(Minho Kwak),이재호(Jaeho Lee),김규홍(Kyu Hong Kim),이동호(Dong-Ho Lee) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
This paper describes on aerodynamic characteristics of pantograph system for Next generation high speed train(HEMU-400). The pantograph which supports electric power is located on the roof. Because of this, it generate high drag, severe acoustic noise and vibration which induced unstable flow due to complex configuration. Therefore, the design of high efficient pantograph needs to increase operational speed. In this research, wind tunnel tests were performed to design a high efficient pantograph system using 1/4 scaled model which were KTX-II pantograph, single arm pantograph and periscope type pantograph with square cylinder shape panhead and optimized shape panhead. For real operational condition, flow directions were adapted by rotation of pantograph. From this results of wind tunnel, it is checked that the pantograph with optimized panhead and single arm type or periscope type has better aerodynamic performance. In addition, lift control device and spoiler in pantograph were tested to investigate the validity of application.
CO2 저감을 위한 자동차 엔진룸의 개선 방안에 대한 실험적 연구
이영빈(Yeongbin Lee),김태경(Tae-Kyung Kim),김규홍(Kyu Hong Kim),이동호,이준호(Jun-Ho Lee),정형석(Hyoung-Seog Chung),장영일(Young Il Jang) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper describes on experimental studies on improvement of car engine room for CO2 reduction with wind tunnel testing. The experimental models were 1/4 scaled car that has detailed car engine room. The free stream of wind tunnel were 60, 90, 120㎞/h. and their experimental Reynolds number varied from 300,000 to 900,000. Drag force were measured with 2 axis load cell. Experimental cases were application of radiator flap, side exhaust of engine room, under cover of engine room, and under cover exhaust for decreasing a cooling drag of engine room. It is checked that these improvement devices has good effect to increase aerodynamic efficiency.