ABSTRACT

The turnout is the key equipment for guiding trains to change lines in railway track, which can affect the vehicle running smoothness and limit the train speed drastically. This paper proposes an optimisation method for turnout layout of the diverging route by considering multiple curvatures or curvature changes through the vehicle-turnout dynamics, and the effect of train speed on dynamic response is studied. For the small numbered turnout, increasing the curve radius of a single circular curve type or using a double radii curves type with a larger front radius can effectively reduce the increase in wheel–rail forces and improve train running quality. For the large numbered turnout, the transition curve can be added to the diverging route to form a circular–transition curve or a transition–circular–transition curve type, thereby significantly reducing the dynamic response of the vehicle-turnout system. The wheel–rail dynamic response increases approximately linearly with the train speed in the circular curve of diverging route, but the increase rate decreases significantly with the train speed in the transition curve part, which is more conducive to the increase of the train speed passing through turnouts.

摘要

道岔是在铁路轨道上引导列车换线的关键设备，会影响车辆运行的平稳性，严重限制列车速度。本文通过车辆-道岔动力学，提出了一种考虑多曲率或曲率变化的分流线路道岔布局优化方法，并研究了列车速度对动力响应的影响。对于小道岔，增加单圆曲线型的曲线半径或采用较大前部半径的双半径曲线型，可以有效降低轮轨力的增加，提高列车运行质量。对于数量较大的道岔，可以在分岔路线上加入过渡曲线，形成圆形-过渡曲线或过渡-圆形-过渡曲线类型，从而显着降低车辆道岔系统的动态响应。轮轨动力响应在分岔路线的环形曲线中随列车速度近似线性增加，但在过渡曲线部分随列车速度增加幅度明显减小，更有利于列车通过速度的增加。投票率。