基于元胞自动机的雾天车辆跟驰建模与仿真  

Modeling and Simulation of Car Following in Fog Based on Cellular Automata

作　　者：刘展宏 杨秀建[1] 吴相稷 黄震[1] Liu Zhanhong;Yang Xiujian;Wu Xiangji;Huang Zhen(Faculty of Transportation Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学交通工程学院,云南昆明650500

出　　处：《系统仿真学报》2021年第10期2399-2410,共12页Journal of System Simulation

基　　金：国家自然科学基金(51465023)。

摘　　要：为保证雾天行车安全,基于元胞自动机建立雾天条件下的跟驰和换道交通流微观模型。针对雾天条件下跟驰状态不稳定的现象,引入动态随机加速进行分段建模。通过元胞尺寸和元胞步长的细化以及添加位置更新余量来提高模拟精度,得到了速度、车辆离散度随时间变化的关系曲线以及速密图。结果表明:中雾车速波动很大;浓雾车速离散度较大;换道次数随雾天浓度增大而降低,与实际交通特征相吻合,证明该模型能部分地反映雾天行车的交通流微观特性和真实体现雾天车辆跟驰行为。In order to ensure the safety of driving in foggy weather, a microscopic model of car following and lane changing traffic flow is established based on cellular automata. In view of the instability of car following state in foggy weather, dynamic random acceleration is introduced to segment modeling. The simulation accuracy is improved by refining cell size and cell step size and adding position update allowance. The relationship curves of speed and vehicle dispersion with time and the speed density diagram are obtained. The results show that: the vehicle speed fluctuates greatly in medium fog;the dispersion of vehicle speed in dense fog is large;the number of lane changing decreases with the increase of fog concentration, which is consistent with the actual traffic characteristics. The model can partly reflect the microscopic characteristics of traffic flow, and more truly reflect the car following behavior in fog.

关 键 词：交通工程 雾天跟驰 元胞自动机 交通流 计算机仿真 

分 类 号：U495[交通运输工程—交通运输规划与管理] TP391[交通运输工程—道路与铁道工程]