基于交通流元胞自动机模型的车辆当量换算

将一维元胞自动机模型用于模拟周期性边界条件下高速公路的车流运动,用随机慢化FI模型对一定交通环境下车流的车速与密度之间的关系进行仿真分析。探讨了不同车型和车速对道路最大流量(最大通行能力)的影响。依据不同车型在同一道路上的不同通行能力,提出了一种不同车型车辆之间当量换算系数的确定方法。在模拟仿真过程中,考虑不同类型车辆的最大行驶速度及所占空间不同,仿真模型具有不同的参数。通过计算机模拟,得到不同车型的交通流基本图,根据相同道路条件下的最大流量值,给出了以通行能力作为基准时当量换算系数的计算公式。

Vehicle Equivalent Conversion of Cellular Automat Model Based on Traffic Flow

Authors introduced the cellular automat(CA) model into the analysis of vehicles equivalent conversion.The highway traffic under the periodic boundary conditions was described.The relationships between the mean speed and the density under some traffic conditions were simulated by using the FI model.Starting from a basic CA model for traffic flow on a freeway,a new method of calculating the equivalent conversion coefficient between different vehicles was proposed.The difference of the vehicles was taken into account by introducing the different maximal speed and occupancy into the traffic flow simulation.The fundamental diagram of traffic flow was obtained.The formulation was given to calculate the vehicle equivalent conversion coefficient for the purpose of the traffic capacity analysis and calculation.