TAIL VIBRATION REDUCTION FOR THE KOREAN NEXT GENERATION HIGH SPEED EMU

초록

This study describes the tail end vibration reduction for the Korean next generation high speed train(HEMU-430X). The trainset with 6 cars was modelled and analyzed using VAMPIRE(railway vehicle dynamic software). In view of ride characteristics, HEMU-430X was expected to highly sway at the tail end because of the different position of yaw damper. The lateral acceleration of end vehicle body exceeded the criteria because of high sway motion which was presumed body hunting. To reduce this hunting motion, some countermeasures such as wheel profile change, the change of damping coefficient for the 2nd lateral damper, the damping coefficient change of yaw damper were taken, but had little effect. Finally, the yaw damper position was changed and the tail vibration disappeared. In real running test, the tail vibration appeared at the speed of 150km/h and position change of yaw damper made the vehicle stable at the speed of 300km/h. At the speed of 387km/h, the hunting of tail end reappeared. The simulation result shows that the increase of yaw damper damping coefficent can reduce the tail vibration. When yaw dampers with 130% damping coefficient were replaced, the train could travel stably at the speed of 408km/h. The maximum test speed of HEMU-430X is 430km/h. If the tail vibration appears at higher speed, some other methods in this study may be considered to reduce it.