• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(I)
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• pp.125-130
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• 2003

Korean High Speed Train (KHST) designed to operate at 350km/h has been tested on high speed line in JungBu site since it was developed in 2002. The dynamic performances of railway vehicle are generally stability, safety and ride comfort. The stability performance of KHST was proved that it is stable at 400Km/h through Roller Rig test. The safety and ride comfort need to be predicted the capability of it at 350km/h by the on-line test because KHST is testing at 300km/h up to now. Therefor, in this paper, the safety and ride comfort at 350km/h are predicted the performance using the acceleration results at 300kw/h and these results show that the KHST's dynamic performances are very good. Also, it illustrate the two cases occurred the abnormal vibration of KHST during some on-line tests. The first case is that the variation of vertical acceleration of wheel is analyzed when an abrasion occur on wheel. The second case is that the lateral acceleration of wheel, bogie and body are analyzed when the KHST is unstable at high speed. The occurrences of these special phenomena were due to the some faults of the suspension and braking systems and the faults were improved. In present, it is testing with safety.

• 한국철도학회논문집
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• 제10권3호
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• pp.257-263
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• 2007

The critical speed above which the vehicle become unstable is one of the items that should be verified in the development of a new train. In the case of a high speed tilting train, which requires both higher critical speed and higher curving speed, the critical speed should be more carefully treated because the both requirements are in conflict with each other in the conventional train design. The main purpose of the present work is to estimate the linear and non-linear critical speeds of 200km/h Korean Tilting Train 'Hanbit200' under development. The newly developed self-steering mechanism was attached to the tilting train to ensure that the critical speed falls under the lower yaw stiffness which is needed to secure higher curving performance. The simulation for predicting the critical speed was done by a commercially available vehicle dynamics software. A full scale roller rig test was carried out to validate the numerical results and to verify the effectiveness of the self-steering mechanism.

• 한국철도학회논문집
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• 제15권1호
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• pp.9-16
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• 2012

철도차량의 탈선은 발생 시 대형사고로 이어질 수 있어, 철도차량의 주행안전 확보 문제는 철도운영기관 및 시설기관의 주요 현안 사항이다. 현재 대차의 동적 안정성 특성 시험은 대차 주행시험대라는 시험설비를 이용하여 시험을 하고 있다. 그러나 실물을 대상으로 한 실물규모의 주행시험대상에서의 동특성 시험은 시험 준비와 관련된 시험비용 및 시험소요 시간의 증가, 다양한 시험조건 설정 측면에서 어려움이 있다. 이러한 단점을 극복하고자 시험 편의성 측면에서 축소형 주행시험대를 활용하고 있으나 국내에서는 아직까지 축소대차, 축소트랙 등의 기초적인 수준의 연구가 진행되고 있다. 본 연구에서는 철도차량의 동적 거동을 예측하는 방법으로서 소형탈선시뮬레이터를 이용하여 상사기법이 적용된 1/5 축소대차의 주행안정성 시험에 대한 연구를 수행하였다. 또한, 시험데이터와 해석데이터를 비교·검증하기 위하여 상용해석프로그램을 이용하여 해석모델을 구현하고, 이를 이용하여 도향상에 따른 1/5 축소대차의 동적특성을 확인하였다.