关于交通路口车流量优化调度仿真

Simulation of traffic flow optimal dispatching

对交通路口车流量的优化调度,能够有效的提升城市交通的管理质量。对车流量的优化调度,需要计算出高峰时段车流量的速度量化,以此定义车流量调度目标函数,完成交通路口车流量调度。传统方法先最大化车流量平均等待时间,给出相邻路口之间的协调约束性,但忽略了定义车流量调度目标函数,导致调度精度偏低。提出基于线性规划的城市交通路口车流量调度模型。采用Small-World模型模拟路口车流量在路网动态的演进过程,利用线性规划方案对城市交通路口的路网结构进行线性分割,获取车流观测矢量时间尺度均衡特性,得到路口信息特征尺度向量空间与空闲时间片的长度,以此为依据计算出高峰时段车流量的速度量化,定义车流量调度目标函数,利用该函数组建交通路口车流量调度模型,完成对交通路口车流量调度。实验仿真证明,所提模型调度精度高,为提升城市交通的管理质量奠定了结实的基础。

A model for scheduling of traffic flow at traffic intersection is proposed based on linear programming. Firstly,the dynamic evolution process of the traffic flow in road network is simulated by using Small -World model and the road network structure of traffic intersection is linearly segmented by using linear programming, then the equilibrium character of time scale of flow measurement vector is acquired to obtain vector space of characteristic scale of intersection information and length of free time slice. The speed quantization of traffic flow in peak period is worked out and the objective function of the scheduling is defined. Moreover, the function is used to build the scheduling model. Finally, the scheduling of traffic flow is completed. Experimental results prove that the model has high scheduling precision. It lays foundation for improving management quality of urban traffic.