Assessment on Adaptability of Bogies with Built-in Journal Boxes to High Speed Railway Lines
A dynamic simulation model of the EMU trailer was created based on the measured parameters and boundary conditions of bogies with built-in journal boxes.This paper studies:a)the carbody vibration characteristics and riding comfort when the new wheel profile and large-conicity wheel profile match with 60D,60N,and their positive/negative deviation rail profiles and when vehicles negotiate the measured tracks at a high speed;b)the operation safety of vehicles when bogies with built-in journal boxes negotiate different curved tracks at a high speed and negotiate an 18#turnout via the main track and the branch track.Furthermore,the study assesses the adaptability of high speed bogies with built-in journal boxes to high speed railway lines.The results indicate that:a)When the EMU with bogies with built-in axle boxes negotiates a straight track at 300～450 km/h,the stability indexes such as derailment coefficient,rate of wheel load reduction,wheel-axle lateral force,and lateral acceleration of frame grow with the increase of operating speed.However,they do not exceed the corresponding standard limits.The carbody riding indexes are excellent;b)When the EMU negotiates small-radius,medium-radius,and large-radius curves at different operating speeds,the operation stability indexes of the vehicles do not exceed the corresponding standard limits,the carbody riding indexes are excellent,and the angle of attack of wheelsets is very small;c)When the EMU negotiates an 18# turnout via the main track at 450 km/h and via the branch track at 90 km/h,the operation safety indexes do not exceed corresponding standard limits;d)When the EMU negotiates the measured track with class Ⅲ irregularity on cross level,the stability indexes such as derailment coefficient,rate of wheel load reduction,wheel-axle lateral force,and lateral acceleration of frame do not exceed corresponding standard limits,and the vertical and lateral riding indexes of vehicles are excellent.From the perspectives of carbody vibration and riding comfort,EMUs with bogies with built-in journal boxes can adapt to the operation on Beijing-Shanghai HSR with operating speeds lower than 400 km/h.
high speed railway lineEMUbogie with built-in journal boxcurve negotiatingturnout negotiating
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