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수치해석을 통한 180㎞/h급 틸팅차량 전두부의 주행 공기저항 해석
고태환(Ko Taehwan),송용수(Song Younsoo),한성호(Han Seung-Ho) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
The optimal design for a leading car considering the aerodynamic resistance is required on the high-speed train due to increasing of ratio of drag force with proportion for the square of velocity. The aerodynamic analysis using CFD in the stage of concept design offers more economical analysis method which is used to estimate the influence of flow and pressure around the leading car than the experimental method using the Mock-up. In this study, we want to assist the artistic design with aerodynamics analysis in order to get the optimal design for leading car with the operation speed at 180㎞/h. The results of aerodynamic analysis for two leading car models which one is expressed with lineal beauty and the other is with curvaceous beauty are compared with each other and they offer the proposal of modification for two models in order to decrease the drag force. The shape of curvaceous model is better for the pressure force but slightly worse for the viscous force than the other. The Fluent software is used for the calculation of flow profile in this study.
고태환(Taehwan Ko),최영민(Young Min Choi),김기남(Gi Nam Kim),한성호(Seong Ho Han) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The development of a tilting train with construction of electric line on the conventional railway is required for speed-up on the conventional railway with many curving sections. The study and development of the pantograph tilting mechanism in order to keep a good contact behavior between a pantograph and a contact wire by tilting a pantograph on the opposite direction of the vehicle tilting direction. In the last study, we analyzed the aerodynamic characteristic of a developing pantograph on the tilting train and obtained the contact force with catenary by aerodynamic lift force by the aerodynamic analysis. In this study, we perform the numerical analysis for design the airfoil controlling lift force on a pantograph. From the aerodynamic simulation and parameter study for the airfoil to control the lift force, we analyze the characteristic of airfoil for the various shape and will suggest the optimal shape of it corresponding to a developing tilting pantograph. The Fluent software is used for the calculation of flow profile in this study.
고속 틸팅열차의 판토그라프 양력조절장치 형상 설계 연구
고태환(Ko Taehwan),한성호(Han Seong-Ho) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
The development of a tilting train with construction of electric line on the conventional railway is required for speed-up on the conventional railway with many curving sections. For development of tilting train, the study and development of the tilting system and tilting bogie having the different mechanism with a general high speed train will play a main role for improving the technology in the field of Korean railway. The study and development of the pantograph tilting mechanism in order to keep a good contact behavior between a pantograph and a contact wire by tilting a pantograph on the opposite direction of the vehicle tilting direction. In this study, we analyzed the aerodynamic characteristic of a developing pantograph on the tilting train and obtained the contact force with catenary by aerodynamic lift force by the aerodynamic analysis. We also performed the numerical analysis for design the device controlling lift force on a pantograph. From the aerodynamic simulation and parameter study for a device to control the lift force, we will suggest the various shape and the optimal shape of it corresponding to a developing tilting pantograph. The Fluent software is used for the calculation of flow profile in this study.
고태환(Taehwan Ko),이수길(Soo-Gil Lee),김기남(Ki-Nam Kim),서승일(Seung-Il Seo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The development of tilting train is required for speed-up on the conventional electric railroad due to the characteristic of Korean railroad with a lot of curve track. The study for tilting pantograph mechanism to decrease the deviation between a catenary and a center of pantograph happened when the carbody is tilted in order to maintain the ride comfort and stability on a curving track is proceeding with the development of tilting train. The test of dynamic behavior for developing pantograph is the most important test to evaluate and verify the performance for it. The main factors to change the contact force between a pantograph and a contact wire are the increase of the vibration of a pantograph and a catenary system and the aerodynamic lift force on a pantograph according to increasing the speed of a train. In this paper, we introduce the design concept for the tilting mechanism of a tilting pantograph and the role and characteristics for several devices adopted in the tilting pantograph mechanism. The results for dynamic behavior for tilting pantograph obtained through the following characteristic experiment and the aerodynamic simulation for are offered and evaluated.
Kinematics Analysis of Tilting Mechanism for Korea Tilting Train with 180㎞/h Service Speed
고태환(Ko Taehwan),김남포(Kim Nam-Po),구동회(Goo Dong-Hoi) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
곡선부가 많은 국내 기존선의 속도향상을 위한 틸팅차량의 개발은 기존선의 전철화에 따른 고속화를 위해 그 필요성이 부각되고 있다. 일반 고속차량과 다른 주행 메카니즘을 가지고 있는 틸팅차량의 주요 기술을 확보하기 위한 틸팅대차와 틸팅시스템의 개발과 연구는 한국철도의 기술력 향상에 큰 역할을 할 것이다. 180㎞/h급 한국형 틸팅차량의 틸팅 메카니즘 기구동역학 해석을 통하여 틸팅 대차를 형성하는 주요 파라메터들의 변화에 따른 틸팅 메카니즘의 특성과 영향력을 검토한다. 이를 통하여 최적의 틸팅운동을 수행할 수 있는 주요 파라메터의 값을 제시함으로서 틸팅차량이 요구하는 최적의 틸팅 메카니즘을 구현하고자 한다. 이 연구를 통해서 얻어지는 결과들은 틸팅 대차용 엑츄에이터의 성능 설계와 해석의 기반 자료로 사용되어진다.
틸팅판토그라프의 틸팅 메카니즘 및 가이드 트랙 형상 설계에 관한 연구
고태환(Ko Taehwan),김남포(Kim Nampo),한성호(Han Seung-Ho) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
The development of tilting train is required for speed-up on the conventional electric railroad due to the characteristic of Korean railroad with a lot of curve track. The study and development of a tilting system and a tilling bogie which have a different mechanism with high speed train will play a important role for enhancement of technology for Korean railway. The study for tilting pantograph mechanism to decrease the displacement between a catenary and a center of pantograph happened when the carbody is tilted in order to maintain the ride comfort and stability on a curving track is proceeding with the development of tilting train. In this paper, we introduce the design concept for the tilting mechanism of a tilting pantograph and the role and characteristics for several devices adopted in the tilting pantograph mechanism. Through the kinematic analysis of tilting mechanism, we will obtain and calculate the optimal tilting angular velocity and acceleration in order to keep the contact behavior of a pnatograph and a catenary according to tilting of a carbody.