임계속도 이력현상에 의한 철도차량 횡방향 이상 진동에 영향을 미치는 인자들에 관한 연구

A Study on the Factors Influencing the Abnormal Vibration of the Lateral Direction in Railway Vehicles Caused by Hysteresis of Critical Speed

This research has been performed to reveal the hysteresis phenomena of the hunting motion in a railway passenger cars. It is found that there are some factors and its operation region to make the nonlinear critical speed reacts to them more sensitively than the linear critical speed. The simulation results show that a self steering bogie system can be a substitute proposal to improve curving Performance together with the reduction of hysteresis of critical speed. Full scale roller rig test is carried out for the validation of the numerical results. Finally, it is certified that wear of wheel profile and stiffness discontinuities of wheelset suspension caused by deterioration have to be considered in the analysis to predict the hysteresis of critical speed precisely.