城市复杂道路网络交通流的分解模型

针对城市道路交通流非线性、不确定性和模糊性特点,将城市道路与快速干道作为整体对待,提出了面向控制应用的城市交通网络宏观动态离散模型。将城市街区作为划分基点,把整个城市道路复杂交通网络分解为交叉口和单向环形道路两个子系统,分别建立了它们的宏观动态模型。通过对交叉口进行理想虚拟变形,将各个单向环形道路连接在一起,从而形成各种复杂网络。对西安市中心区域的实际交通流数据进行了仿真研究,结果表明该交通流模型基本实现了城市道路与快速干道的统一分析建模,较好地反映了城市路网的交通流信息,可以作为城市交通控制系统分析和设计的有力工具。

Decomposed traffic flow model for the complex urban road network

According to the nonlinearity, uncertainty and fuzziness of the traffic in the urban road network, by combining the urban road and the expressway, a control oriented macroscopic dynamic traffic flow discrete model for the complex urban road network is proposed. Taking the blocks as base points, the urban traffic network system was divided into two subsystems: cross road and one way ring road. The two subsystems’ macroscopic dynamic models were presented respectively and the relation among two models was also discussed. Computer simulation with actual Xi’an traffic flow data shows that the traffic model can accurately express the traffic flow information in the urban road network preferably and be used for the urban traffic control system analysis and design.