Abstract: Based on the existing Cellular Automation（CA） models of moving block system, an improved CA model is proposed to solve the ‘irrational bounce’ problem which is detected in the velocity change of tracking trains. The train flow is simulated by applying the improved model and its phase diagram is obtained. In addition, the paper discusses the factors that can affect the pattern of the train flow. It is reported that the station can regulate the status of train flow and the increase of the velocity gap of different trains and the decrease of percentage of fast trains can significantly improve the line capacity, by promoting the operation efficiency of the whole system.

Key words: cellular automation, moving block system, phase diagram, train flow

摘要： 在既有元胞自动机模型的基础上，针对移动闭塞系统下列车追踪运行的特点提出一种改进的元胞自动机模型，该模型有效解决了既有模型中列车速度变化的不合理问题，提高了模型的准确性和可靠性。应用该模型获得了移动闭塞系统下列车流的相位图，并分析了移动闭塞系统中线路上快慢车开行比例及开行速差等因素对线路通过能力及列车平均速度的影响。研究结果表明，车站对列车流具有调和的作用，能够使列车流得到一定程度的同化。此外，减小快慢车速差可以有效增大线路的通过能力，而增加快车开行比例，则能够显著提高所有列车的运行效率，从而保证整个系统的高效运营。

关键词: 元胞自动机, 移动闭塞, 相位图, 列车流