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노주현(Rho Joo Hyun),김덕영(Kim Duck Young),구요천(Ku Yo Cheon),윤수환(Yun Su Hwan),이동호(Lee Dong Ho),권혁빈(Kwon Hyeok Bin) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The ballast or other objects may be located on the rail road by a lump of ice, repairing operation on the track, or the strong gust due to the high speed running of the train. When a train operated in this condition, it causes serious damages to the wheel, train, and structures near the track, or the secondary ballast flying. To remove these objects safely, a ballast blower is suggested which was attached under the train. Firstly, the numerical analyses are investigated to find out the basic flow characteristics of the ballast blower. Next, the performance of the ballast blower is verified by wind tunnel experiments. Through these studies, it is expected that the ballast blower can be applied practically.
2MW급 직접구동형 풍력발전기의 풍황 민감도 및 토크모드 스위칭 성능 해석
노주현(Joo-Hyun Rho) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
Wind turbine generators were designed on general regulations of wind condition. At real situations, it could be different from the design conditions. There are many control methods and definitions of transient region, because an efficient wind turbine generator control logic is the important matter in generator performance and annual energy production at real conditions. In this document, the power generation sensitivity for wind speed and turbulence intensities was defined to know the sensitive transient region. Wind conditions are applied for the ranges of 7~10m/s mean wind speed and 14~20% turbulence intensity. The sensibility of HR-D86 wind generator was increased in transient region(8~10m/s) on power curve diagram through a torque control to a pitch control. And then GH-bladed simulations was performed for performance analysis of the torque mode switching in transient region on 2MW direct drive wind generator(HR-D86) which is designed IEC class II for onshore. Through the sensitivity and performance analysis, the sensitivity for real wind condition could be the performance index for an wind generator. And the torque mode switching in transient region can increase the mean power generation on HR-D86 wind turbine generator.
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.
형상 최적화를 위한 Vehicle Modeling Function을 이용한 자동차 3차원 형상 구현
노주현(Joo-Hyun Rho),구요천(Yo-Cheon Ku),윤수환(Su-Hwan Yun),이동호(Dong-Ho Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Representing a complex, three-dimensional shape, such as an automobile, requires a large amount of CAD data consisting of millions of approximated discontinuous points, which makes it difficult or even impossible to efficiently optimize the entire shape. For this reason, in this paper, function based design method is proposed to optimize the external shape of an automobile. A vehicle modeling function was defined in the form of a Bernstein polynomial to smoothly express the complex 2D and 3D automobile configurations. The sub-sectional parts of the vehicle modeling function are defined as section functions through classifying each subsection of a box model. It is shown that the use of the vehicle modeling functions has the useful advantages in an aerodynamic shape optimization.
육상용 2㎿급 직접구동형 풍력발전기의 성능 민감도 분석
노주현(Joo Hyun Rho),윤광용(Kwang Yong Yoon),이권희(Kwon Hee Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Load calculations for wind turbine system design are important to determine the efficiency of wind turbine system. Although mean wind speed or turbulence intensity satisfy the designed values based on the Regulations, the designed values can be different to the values on real wind conditions. To know the characteristics in sharply turned, the performance analysis and sensitivity calculations were carried out by applying the ranges of 7~10㎧ mean wind speed and 14~20% turbulence intensity about 2㎿ direct drive wind turbine of IEC class Ⅱ designed for onshore. The sensibility of Hyundai Rotem wind turbine changes rapidly in region Ⅱ on power curve diagram through a torque control to a pitch control. This results could be applied to the optimal control logic design by the load calculation results.
노주현(Rho Joo-Hyun),구요천(Ku Yo-Cheon),윤수환(Yun Su-Hwan),곽민호(Kwak Min-Ho),박훈일(Park Hoon-Il),김규홍(Kim Kyu-Hong),이동호(Lee Dong-Ho) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Through Korean high speed train development project "G7 Leading Technology Development Project" from 1996 to 2002, HSR-350X has been developed. It can run the maximum operating speed of 350 ㎞/h. Basedon this technology, KTX-2 which will be served commercially has been developed till 2007. This paper introduces the aerodynamic analysis of the High-Speed EMU and shows the results of optimized aerodynamicnose shape design techniques and clean pantograph panhead original techniques study. These are the important parts of developments for high speed train which maximum speed is 400 ㎞/h. Especially for decrease of tunnel micro pressure waves, the optimized nose area distributions were derived and the characteristics of micro pressure wave were analyzed. The robust optimized pantograph panhead shapes investigated to improve the performance and decrease the vortex flow which is thought to be its noise source. These shapes are clean and robust to external disturbances like unsteady accelerated flow or side wind was derived. Finally aerodynamic performances was verified with PIV and smog visualization by wind tunnel test.
노주현(Rho Joo-Hyun),구요천(Ku Yo-Cheon),윤수환(Yun Su-Hwan),곽민호(Kwak Min-Ho),박훈일(Park Hoon-Il),김규홍(Kim Kyu-Hong),이동호(Lee Dong-Ho) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Recent high-speed trains around the world have achieved remarkable improvement in speed. In Korea, the new high-speed train with maximum speed of 400㎞/h has been developing through the "Future High-Speed Rail System Project". The improvement in train speed brings numerous aerodynamic problems such as strong aerodynamic resistance, noise, drastic pressure variation due to the crosswind or passing by, micro-pressure wave at tunnel exit, and so on. Especially, the nose shape of high-speed train is closely related to the most of the aerodynamic problems. Also the pantograph has to be considered for noise prevention and detachment problems. In this paper, the project, "Research on the Aerodynamic Technology Advancement of the High-Speed EMU" is introduced briefly, which is one of the efforts for the speed improvement of the "HEMU400x". Finally, two main results of train nose and pantograph will be shown. First, the optimization of the cross-sectional area distribution of the high-speed train nose to reduce tunnel micro-pressure wave, and second, robust design optimization of the panhead shape of a pantograph.