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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),김정석(Jung-Seok Kim),서승일(Sung-Il Seo),이수길(Su-Gil Lee),박태원(Tae-Won Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The bogie is the one of the most important components in a railway vehicle, as it is to support the car body and to guide the vehicle to the rails, to provide running stability, safety against derailment, better ride comfort, better curving performance. The tilting bogie is the bogie which include the tilting mechanism and tilting actuator within it and the tilting bogie should provide the better curving performance, better stability and ride comfort than conventional bogie as the tilting train run curve track almost 30% faster than conventional train. This paper described the dynamic characteristics of the tilting bogie which was developed as a part of the Korean National R&D project, 200㎞/h tilting train development for the speed-up of conventional railway lines.