城市协调控制主干路交通流模型

Mathematical model of traffic flow on arteries with coordinated control system

中文关键词  交通流  元胞自动机  主干路  协调控制  开放性边界

英文关键词  traffic flow  cellular automaton  artery  coordinate control  open boundary

中文摘要

      城市协调控制主干路交通流模型是交通预测、仿真、信号配时的前提和基础. 论文通过改进开放性边界条件, 利用一维元胞自动机模型模拟协调控制主干路交通流状况. 该模型采用差分方程的形式描述车辆动态行为. 解除了信号灯等间距布设的限制, 每个路口的信号灯可以根据交通流变化选择绿信比, 相邻交叉口采用绿波控制方式调整相位差. 论文利用MATLAB软件对模型进行仿真, 分析了驶入主干路流量以及干、支路的转弯流量对于主干路平均速度、平均密度和平均流量的影响. 在仿真结果的基础上, 提出了相应的控制措施改善主干路交通状况.

英文摘要

      Mathematical model of traffic flow on arteries with coordinated control system is a prerequisite for traffic forecasting, imulating and signal timing. A one-dimensional cellular automaton-model with improved open boundary conditions is used to simulate the traffic flow on arterial roads with coordinated control system. The model employs difference equations to describe dynamic behaviors of vehicles. The restriction on regularly spaced distribution of traffic signal lamps can be eliminated. Furthermore, the green-signal-ratio on every intersection can be chosen according to traffic flow fluctuations. The phase difference between adjacent intersections can be adjusted by green wave control. MATLAB is employed to simulate this model to analyze the impacts on mean velocity, density and volume of arterial traffic flow by the flow volume on the artery and the turning flow volumes from branches. Based on the results of simulation, a series of proposals for improving the arterial traffic situations are put forward.