• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1213-1220
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• 2008

In this study, the crashworthy design guidelines for the high speed EMU were derived and numerically evaluated. As for this high speed train, there are several different features from the KTX in that the conventional type bogies are adopted and the front end car (TC car) accommodates passengers. It is natural that the impact acceleration of the front end car should be controlled under the appropriate level stipulated at safety regulations for collision accidents. Also, car-to-car interfacing structures and devices should be deliberately designed to prevent overriding and telescoping mechanisms. As the first step for these design countermeasures, it was studied that how much impact energy should be absorbed at the energy absorbing zones and devices of each carbody to satisfy the impact acceleration regulations of the safety regulations. These results will be used as the crashworthy design guidelines for the high speed train in the next year research.

• 한국산학기술학회논문지
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• 제20권12호
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• pp.797-803
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• 2019

본 연구는 동력분산형 고속열차의 횡방향 진동을 저감하기 위하여 진행되었다. 동역학 해석을 통한 연구에서 동력분산형 고속열차 시제차량(HEMU-430X)은 고속열차에서 주로 사용되는 차륜프로파일(XP55, GV40, S1002)에 관계없이 낮은 등가답면구배에서 횡방향 진동이 커지고, 차륜 마모가 진행되어 등가답면구배가 커지면 횡진동이 감소하는 경향을 보였다. 이는 HEMU-430X에 적용된 현가장치 특성치들의 조합된 결과로 인해 등가답면구배가 낮을 때 차체와 대차가 1.4Hz의 주파수로 공진하여 차체 헌팅이 발생되기 때문이다. 고속열차의 횡방향 진동저감에 대한 해외 사례에서 요댐퍼의 유압강성(Hydraulic stiffness)을 낮추어 진동을 개선한 사례를 고찰하였다. 요댐퍼의 시리즈 강성은 유압강성과 탄성조인트의 조합인데 본 연구에서는 유압강성 조정대신 비교적 간단하게 할 수 있는 탄성조인트의 강성을 낮추어 횡방향 진동을 개선하고자 하였다. 신규 제작된 탄성조인트를 적용한 요댐퍼의 시리즈 강성은 기존 요댐퍼 대비 60% 수준으로 낮았다. 60% 수준의 시리즈 강성이 적용된 요댐퍼를 HEMU-430X의 TC~M2 3량에 설치하여 시운전 시험을 수행하였다. 시운전 시험 결과 TC를 선두로 한 하행 주행 시 TC~M1의 횡방향 진동이 개선되고, MC를 선두로 한 상행 주행 시 후미 TC차량의 횡진동이 개선되는 결과를 보였다. 본 연구의 진동저감 방안은 향후 영업운전을 위해 도입되는 EMU-250 및 EMU-320의 횡방향 진동 문제 발생 시 해결책으로 적용할 수 있다.

• 한국철도학회논문집
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• 제14권4호
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• pp.333-340
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• 2011

본 논문은 유럽 TSI와 국내철도차량안전기준에 정의된 건널목 충돌사고시나리오에서 요구하는 성능의 대형 변형체 장애물의 유한요소 모델에 대하여 2가지 종류의 모델을 개발하여 한국형 분산형 고속철도 차량에 적용하고 평가하였다. 규정에서 요구하는 대형 장애물은 기존 강체모델에서 현재의 변형체모델로 변경되었으며 규정에 정의된 방법으로 변형체 강성 값이 검증되어야 한다. 여러 번의 시뮬레이션을 통해 기준을 만족하는 균일한 밀도와 강성의 솔리드 형 장애물 모델과 균일하지 않은 셸 형 장애물 모델 등 2가지를 개발하였다. 본 연구에서 개발된 대형장애물을 사용하여 분산형 고속열차를 대상으로 규정의 대형장애물 충돌시뮬레이션을 수행하였고 그 결과를 평가하였다. 셸 형과 솔리드 형 장애물은 열차와 충돌 후 거동에 상당한 차이가 있었고, 셸 모델이 더 가혹한 결과를 나타내었다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.973-978
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• 2008

This study concerned on the critical speed due to hunting and snake motion train to ensure the stability. First, the critical speed was calculated by using a numerical model, and calculated the critical speed of the vehicle through the simulation with the use of ADAMS/RAII. Also, the snake motion was confirmed through a modal analysis and running simulation. The calculated results, show that the rail irregularity becomes the influential factors of the stability since it is the direct source of excitation of the vehicle.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1148-1153
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• 2008

Noise pollution from a high speed train has been a serious social issue nowadays. Especially when a train speed exceeds 350 km/hr, an aerodynamic noise level has been known to be increased drastically. In this paper, explained were the studies on the noise reduction and engineering approaches to estimate and analyze influences of noise. Based on this study, it is estimated to apply results to development of trains and expected to accomplish futuristic technology by devising noise prediction of high speed EMU and measures to reduce noise on a design phase.

• 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 2008년도 춘계학술대회 논문집
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• pp.1166-1171
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• 2008

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 km/h. Based on 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 aerodynamic nose 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 km/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.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.772-779
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• 2008

Through this study, standard design guidelines for the high speed EMU have been derived to meet the crashworthiness requirements of the Korean rollingstock safety regulation. The crashworthiness regulation requires some performance requirements for two heavy collision accident scenarios; a train-to-train collision at the relative speed of 36 kph, and a collision against a standard deformable obstacle of 15 ton at 110 kph. The complete train set will be composed of 2TC-6M with 13 ton axle load, different from KTX with the power car of 17 ton axle load. Using theoretical and numerical analyses, some crashworthy design guidelines were derived in terms of mean crush forces and energy absorptions for main crushable structures and devices. The derived design guidelines were evaluated and improved using one dimensional spring-mass dynamic simulations. It is shown from the simulation results that the suggested design guidelines can easily satisfy the domestic crashworthiness requirements.

• 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.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.987-988
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• 2012