基于元胞自动机的雾天车辆跟驰建模与仿真

doi:10.16182/j.issn1004731x.joss.20-0598

摘要/Abstract

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。

关键词: 交通工程, 雾天跟驰, 元胞自动机, 交通流, 计算机仿真

Abstract: 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.

Key words: traffic engineering, car following in fog, cellular automata, traffic flow, computer simulation

中图分类号:

U495
TP391

刘展宏, 杨秀建, 吴相稷, 黄震. 基于元胞自动机的雾天车辆跟驰建模与仿真[J]. 系统仿真学报, 2021, 33(10): 2399-2410.

Liu Zhanhong, Yang Xiujian, Wu Xiangji, Huang Zhen. Modeling and Simulation of Car Following in Fog Based on Cellular Automata[J]. Journal of System Simulation, 2021, 33(10): 2399-2410.

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