移动闭塞条件下线路弯道对列车交通流影响的研究

在NaSch模型的基础上,针对铁路线路特点提出了一种用于模拟铁路线路弯道的多列车追踪运行的元胞自动机模型.应用该模型,进行了计算机数值模拟,研究了具有不同弯道半径、不同外轨超高和不同弯道长度的线路弯道对铁路交通流的影响.模拟结果表明:建立的模型能够准确的反映出特殊线路交通流情况,线路弯道对列车的行车安全有较大的影响,同时再现了时走时停的交通波现象,根据仿真结果得出了随着弯道半径的增大,列车的晚点时间逐渐减少,合理选择弯道半径、外轨超高值和弯道长度,可以显著提高线路的通行能力,减低轮轨磨耗,保证列车的安全、舒适运行.所得结果对铁路线路选线设计和运营管理有一定的指导意义.

Research on train traffic flow affected by the line curve of the moving block system

According to the characteristics of railway line and NaSch model a cellular automata model for simulating multi-train tracking of railway curve is proposed. The computer numerical simulation is carried out and the influence of different curve radius, outer rail superelevation curve and curve length on railway traffic flow are studied using the propose model. Simulation results show that the model can reflect accurately traffic flow situation of the special line; and the train line curve has a great influence on the running safety and reveals the traffic wave phenomena in running and stopping. With increasing curve radius, train delay time decreases gradually according to the simulation results. Reasonable selection of curve radius, the outer rail superelevation and curve length can significantly improve the line capacity and reduce the wheel rail wear, so that these can guarantee the safety and comfort of the train running. The results have certain guiding significance for the railway line design and operational management.