轨道交通列车过岔振动特性研究

建立了列车过岔有限元模型,利用轨道振动微分方程原理,定性研究城市轨道交通中不同轨下刚度和列车速度在道岔辙叉区对轨道振动特性的影响.分析了心轨尖端、心轨跟端及辙叉区共用垫板中心等特殊部位处的轨道振动特性.结果表明:列车速度的变化对钢轨最大竖向加速度和岔枕最大竖向加速度的影响较大;而辙叉区轨下刚度的变化对钢轨最大竖向位移、岔枕最大竖向位移及岔枕最大竖向加速度有较大的影响.

Dynamic Characteristics at the Turnout of Urban Rail Transit

The effect of track stiffness and velocity of vehicle on the track dynamic characteristics at the frog system has been investigated by finite element computational model,which is done according to the theory of rail vibration differential equation. The rail dynamic characteristics at the special parts,such as the beginning part, the ending part of the point rail and the medium part of the sharing pads have been analyzed. The computations show that the changes of vehicle velocity have greater influence on the track vertical acceleration, the changes of track stiffness of frog system have also greater influence on track vertical acceleration and on vertical displacement of the cross tie.