固定闭塞系统中列车流的特性分析

在NS模型的基础上，针对轨道交通的特点，本文提出一种用于模拟四显示固定闭塞系统的元胞自动机模型.应用该模型模拟四显示固定闭塞系统中的列车延迟的交通现象，分析了四显示固定闭塞系统中的发车时间间隔、客货车比例、车站停靠时间、停靠站台数量等因素对列车平均延迟时间的影响.结果表明：客、货车混行时，货车对后行客车的运行会产生抑制作用，调整客、货车在车站的停靠时间可有效缓解这种抑制作用，减少客车的延迟时间；增加停靠站台的数量可提高线路上的车流密度，缓解车流延误，但在较大的发车时间间隔时，站台的利用率会降低. 关键词： 元胞自动机 固定自动闭塞系统 列车延迟

Analysis of the property of train flow in the fixed autoblock systems

Based on the NS traffic model, we propose a cellular automaton traffic model for four-aspect fixed autoblock systems. We simulate the traffic phenomenon of train delay. We also investigate the effects of main factors including train interval, proportion of freight train, dwell time of the train in the station and unmber of platforms. Simulation results show that: (i) the freight train can restrain the running velocity of the passenger train following it; (ii) the delay may be relaxed by adjustment of the train's dwell time in the station; (iii) the increase in number of platforms in the station may improve the traffic density, however, the using frequency of the platform may be reduced when the train interval is large.