心轨轨顶降低值对轮岔动态相互作用影响研究

Study on the Influence of the Nose Rail Height on the Wheel-turnout Interaction Dynamics

利用能够准确反映轮岔接触特性的车辆-道岔系统动态相互作用模型,从轮岔振动和轮岔接触几何关系两个方面,研究岔心区心轨关键截面轨顶高度降低值对高速道岔系统动力的影响特性。结果表明,通过设置合理的长短心轨关键截面轨顶高度降低值可以明显降低轮岔动态相互作用,达到道岔区低动力作用目的。针对现有某种高速道岔心轨轨顶高度设置,提出心轨关键截面新的轨顶降低值方案。与既有轨顶高度设置相比,本文建议方案在不影响轮岔接触特性前提下降低了轮岔动态相互作用,有利于延长道岔使用寿命。

How to set the high speed turnout rails height in its changed-section part has not been solved from the point of wheel-rail dynamics. By use of the vehicle-turnout dynamic interaction model in which a reasonable sub-model simulates the wheel-turnout vibration and geometrical contact relationship, the influence of the nose rails height in the key section of its changed-section part on the wheel-rail contact characteristics and the dynamics of the high-speed turnout system are presented. It is shown that, if the nose rail height in its key section is reasonably set, the vehicle-turnout system dynamics can be remarkably lowered. On the basis of the simulation results, the reasonable nose rails height of the China-made 200 km/h No. 12 single-way-moved nose rail turnout is suggested. Compared with the conventional structural design, the proposed method is helpful to lower the vehicle-turnout system dynamics.