• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.465-470
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• 2009

This paper discusses the numerical study on the dynamics of the high-speed EMU by developing the 34 degrees-of-freedom (DOF) lumped parameter model including the effect of the creepage. In order to reflect the creepage, the Kalker's wheel-rail contact theory is introduced in the proposed model. The dynamic analysis using $Matlab^{(R)}$ software is conducted, and its results are compared with those from ADAMS/Rail to investigate the validity of the proposed 34-DOF lumped parameter model. It is demonstrated that the results from the numerical study are similar to those from ADAMS/Rail. In addition, the critical design parameters of high-speed EMU are examined, and the design guidelines for reducing vibration and enhancing ride quality are proposed.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.535-544
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• 2009

Korea holds the High-speed EMU technique and produced to the forth in the world. Also, Preparing an advance opportunity to the world market. especially, We must develop the Original form individually to have competitive power about industrialized country of a high-speed train. This research proposed a design development process which consider interior design to enhance a line of flow and efficiency from implementation of shape about the Streamline nose.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.217-222
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• 2009

High-speed EMU under development vibrates more than a articulated high-speed train since power units are attached on each vehicle and railway vehicle. In this study, anisotropic equivalent stiffness of a aluminum extrusion plate were calculated to know and predict vibration characteristic of High-speed EMU under development. Eigen frequencies and modal shape of high speed train vehicle were calculated. And vibration generated was predicted at each position of vehicle when vehicle was operating.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.277-282
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• 2009

This research present final Proto-type design of Korean High speed EMU identity establishment. To making Proto-type design; Frist step is extracting design factor which can makes final image of Proto-type. And last, Apply it to the Original-form which was presented by last research. This research is for take one's own identity of korean High speed EMU, and makes originality of design for korean rail-road culture.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1426-1434
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• 2008

This paper addresses the numerical study on the dynamics of the High-speed EMU to enhance the ride quality. The 17 and 34 degrees-of-freedom (DOF) dynamic models for a single railway vehicle are proposed, and its vibrational characteristics according to the nonuniform rail profile are analyzed via Matlab. The validity of the proposed 34-DOF model are verified by comparing its dynamic characteristics and those from ADAMS/Rail. In addition, the critical dynamic parameters are identified by the parametric analysis, and rough design variables to reduce the vibration level of the railway vehicle are proposed. Finally, the frequency analysis - FFT - are conducted to extract the resonant frequencies, which have a significant influence on the determination of the critical speed of the railway vehicle. It is demonstrated that the results from the Matlab-based numerical analysis of the 34-DOF dynamic model are similar to those from ADAMS/Rail.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1338-1340
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• 2003

현재의 공장 자동화, 국방, 항공, 철도, 금융 등을 포함하는 실시간 시스템은 여러 개의 컴퓨터가 다수의 장소에서 서로의 데이터 교환을 통한 협동 작업으로 여러 가지 기능 및 업무를 수행한다. 이는 마치 멀티프로세서를 가진 컴퓨터같이 생각할 수 있으며 이와같은 시스템에 있어서 업무 수행의 효율은 각 프로세서의 계산 능력에 비례함과 동시에 각 노드간의 데이터 전송 능력에 비례한다고 할 수 있다. 이와 같은 실시간 시스템이 올바르게 동작하기 위해서는 한정된 시간 내에 일정한 양의 데이터의 전달을 확정적으로 보장해 줄 수 있는 네트워크를 필요로 하는데 이를 실시간 네트워크(Real time network)라고 한다. 현대의 분산제어 시스템에 있어서 확정적인 시간 내의 데이터 전달은 전체 제어 시스템의 응동 특성에 중요한 요인이 된다. 본 논문은 한국형 고속 전철의 시제차(Prototype train)에 적용된 국제 표준 실시간 네트워크인 열차 통신 네트워크(Train Communication Network)에 관련한 내용이다. 실시간 네트워크는 실시간성을 보장하기 위해서 상호 교환될 데이터가 필요에 따라(온라인 상에서) 변경되는 것이 아니라 오프라인 디자인의 결과로 미리 결정되어진다. 즉 통신장치 사이에 전달되는 네트워크 데이터는 미리 설계된 네트워크 테이블을 기초로 정해진 시간에, 정해진 데이터가, 정해진 방식으로 전달되어 진다. 본 논문에서는 실시간 네트워크의 오프라인 설계를 하기 위한 도구로서 개발되어진 네트워크 데이터 테이블 작성 프로그램에 대해서 설명한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1221-1226
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• 2008

Present, the cooling method of using a phase-change heat transfer such as immersed type, heat pipe etc is applied in cooling of high-capacity power semiconductors of the main power system for the high speed train with the concentrated traction. In order to apply these phase-change cooling system to the high speed EMU to be developed, needed are technological researches of consideration of installing space, air passage, light weight material and miniaturization. Although this research establishes design specifications through theoretical analysis and computational analysis from the basic design process of the cooling system of the propulsion system for the high-speed EMU, when details design is completed, present improvement subject and optimum design before manufacturing the prototype of the cooling system on the basis of analysis results. And then, carried out will be the performance tests through prototype manufacture and reliability estimation by components of cooling system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1227-1232
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• 2008

High-speed train of push-pull type called as G7 train has been developed and chosen as the model of KTX-II which will be operated on Honam Line nexr year. However, the EMU-type high-speed train appeared to be the recent trend that foreign markets have shown. Also, in the near future, a great number of new train sets are needed to accommodate the increased passengers in our country. Thus, development of the high-speed EMU was decided, planned, and started. In the development, included were almost all fundamental key technologies such as noise and vibration reduction in a passenger cabin, running characteristics, aerodynamic analysis, crashworthiness evaluation, EMI/EMC analysis, design of the cooling system for the propulsion control system, enhanced performance of transformer and switching converters, synchronous traction motor with permanent magnets, new design of front nose and ergonomic interiors, application of advanced information technology(IT) and smart sensors and the cost reduction of construction of railway bridges, etc. Each key technologies are carried out as sub-project independently but under the supervision of a project. The project will develop the high advanced level of technologies and provide necessary know-why's and support the team in charge of the development of the high-speed EMU, Hyundai Rotem Co. Ltd. The high-speed EMU will be successfully developed with the support of the project.

• 한국철도학회논문집
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• 제15권6호
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• pp.543-549
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• 2012

본 연구는 차세대 분산형 고속전철 시제차량(HEMU-430X)의 후미진동저감에 관한것이다. VAMPIRE 해석을 통한 주행거동 관찰에서 HEMU-430X는 전두부 유선형 형상유지를 위하여 설치된 한방향 요댐퍼 때문에 후미차량에서 횡방향 진동이 예상되었으며, 430km/h에서 기준치를 초과하는 경우가 있었다. 이 후미진동을 감소시키기 위하여 차륜답면 형상변경, 횡댐퍼 댐핑계수조정, 요댐퍼 계수조정 등 다양한 방법을 시도하였으나 후미진동이 없어지지 않았다. 최종적으로 요댐퍼를 양방향으로 바꾸었을 때 횡방향 진동이 사라졌다. 실제 시운전에서는 150km/h로 주행하였을 때 횡방향 후미진동이 나타났으며, 요댐퍼를 양방향으로 바꾸어 300km/h 주행 시에도 후미진동이 나타나지 않았다. 추후 430km/h까지 최고속도시험을 수행할 예정인데 높은 속도에서 후미진동이 다시 발생한다면 본 연구에서 제시한 차륜답면 형상변화, 횡댐퍼 계수 조정 등의 방법을 이용해서 진동을 저감시킬 수 있을 것이다.

• 한국소음진동공학회논문집
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• 제20권5호
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• pp.477-485
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• 2010

In this study, we suggested several approaches to evaluate the collision acceleration of a carbody under the article 16 of the Korean rolling stock safety regulations. There are various methods to evaluate the rigid body accelerations such as the displacement comparison method by double integration of filtered acceleration data, the velocity comparison method by direct integration of filtered acceleration data, and the analysis method of a velocity-time curve. We compared these methods one another using the 1D dynamic simulation model of Korean high-speed EMU composed of nonlinear springs or bars, dampers, and masses. From the simulation results, the velocity-time curve analysis method and the displacement comparison method are recommended to filter high frequency oscillations and evaluate the maximum and average accelerations of a carbody after a train collision.