摘要
针对既有的元胞自动机模型对各类车辆的实际性能考虑不够,造成模型表现为混合交通特性准确性不高的缺陷,设计了一套改进的NS模型.该模型考虑了行人、自行车、小车、大车的实体大小,安全间距,最大速度,适用加速度,反应时间以及可能移动的最大距离等特性,并在计算机上编程实现了模型.运用该模型对信号交叉口处混合车流的排队消散情况进行了分析,采用车辆依次通过停车线的车头时距对模型的准确性进行了评价,并对不同大车比例下混合交通的平均车头时距进行了分析.输出结果与交叉口实际调查数据的对比显示:车头时距数值与实际情况吻合良好,得到的大车对小车换算系数为2.04.
The current cellular automaton models are not very precise in simulating mixed traffic due to the poor consideration of actual vehicle performance. An improved NS model was developed based on the consider- ation of actual size, safe space, maximum speed, achievable acceleration, reaction time and maximum distance of pedestrians, cyclists, small vehicles and large vehicles. The corresponding computer program was developed and applied to analyze the queuing and discharging process at typical signalized intersections. Time headway was used as the measure of effectiveness to evaluate the model, and average time headway of mixed traffic flow with different large vehicle composition was analyzed with the model. The comparison of the model out- put and the investigated data at actual intersections indicates that the time headway of the model is close to the field data. The conversition factor of large vehicle and small vehicle obtained from the model is 2.04.
出处
《中北大学学报（自然科学版）》
CAS
北大核心
2014年第5期541-546,共6页
Journal of North University of China(Natural Science Edition)
关键词
城市交通
交通模拟
元胞自动机
车辆性能
信号交叉口
urban traffic
traffic simulation
cellular automaton
vehicle performance
signalized intersection
