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한국형 틸팅차량 설계의 비틀린 궤도상의 탈선안전도 검토
김남포(Kim Nam-Po),김정석(Kim Jung-Seok),박태원(Park Tae-Won) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
The 180 ㎞/h Korean Tilting Train(TTX) which is now developing as a part of the Korean National R&D project, was elaborately designed. As the tilting trains run curve track with the 30% higher speed than normal trains, the higher centrifugal and dynamic force are expected. Furthermore the complex tilting system increase the probability of failure. Therefore it is very important for tilting train to ensure safety against derailment under the various kind of failed condition in the middle of running as well as normal operating condition. The TTX train have the relatively high roll stiffness to improve the lateral ride comfort and to limit the roll displacement on the curve. But the higher roll stiffness increase the risk of derailment on the twisted track. This paper describes the study to review the safety against derailment caused by the wheel unloading on the severely twisted track. The worst combination of maximum cant change with maximum twist defect was established by numerical simulation. And also it was assumed that the air bag deflated and still the train run its speed limit. Those kind of assumption might be the worst case from the view point of wheel unloading derailment on the twisted track. The dynamic simulation was done by means of VAMPIRE S/W and non-linear transient analysis. We found that derailment quotients Q/P was only slightly influenced by track twist but the wheel unloading was greatly influenced. And we ascertained that the higher roll stiffness the higher wheel unloading. In case of air bag deflated situation, the wheel unloading reached up to 100% which means the wheel lift or jumped. Therefore it was concluded that the design need to be improved to ensure the safety against derailment on the maximum twisted track in case of air bag deflated and tilting train"s speed limit.
김남포(Nam-Po Kim) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11
국내 철도 수송 분담률 확대와 선로용량 부족 문제를 해소하기 위해, 국가에서는 이단적재 컨테이너 화차(이하 DST, Double Stack Train)의 도입 운영을 검토 중에 있다. DST 는 컨테이너를 이단으로 적재함으로써 화물 수송량을 획기적으로 증가시킬 수 있는 차량이나, 높이 증가와 중량 증가등으로 기존선로에 적용하는 데 무리가 따른다. 따라서 DST 의 성공적 운행을 위해서는 축중, 전차선 높이, 건축한계, 유효장 제약 등으로 다른 DST 운영국가에 비해 취약한 국내 환경에 적합한 한국형 이단적재열차의 개발이 필요하다고 할 수 있다. 본 논문은 사전적 연구로 진행된 한국형 DST 에 대한 개념 설계의 과정과 그 결과에 대해 기술한다. In order for railways to solve the shortage problems of line capacity as well as to increase the share of freight- market, DST(Double Stack Train) is a very effective way. Therefore the Korean government has been strongly considering the application of DST in Kyung-Bu line. But due to the limit of infrastructure, such as permissible axle load, construction gauge and train length, the new DST suitable for our Railway environment should be developed. This paper shows the new concept of DST as the results of preliminary study.