宏观基本图稳定性评价方法及在子区划分的应用

Method of sub-region division based on macroscopic fundamental diagram

提出宏观基本图稳定性的评价方法及指标,对MFD进行了特征分析,定义三个特征参数:路网运行最大加权平均交通量、路网运行临界加权平均交通量、路网运行临界运行车辆数;通过特征分析提出基于MFD的交通状态划分方法,划分为顺畅、临界、拥堵等三种交通状态;着重讨论临界状态的交通特征,提出利用临界状态的路网加权平均交通量作为路网交通运行离散度来评价MFD的稳定性。在子区划分的应用中,通过考察不同子区数量下的全路网交通运行离散度,得到最优的路网路网子区数量及相应的划分方案。最后,在微观交通仿真平台上,通过对现实路网的交通运行历史数据进行模拟,在广州市海珠区江南片区给出实例分析。把路网总长度为约25 km,覆盖范围约4 km2的路网划分为两个子区,为交通管理决策提供支持。

Then the evaluation method of the sub - area division is put forward. Three characteristic parameters are defined to grasp thecharacteristics of the MFDs,including network maximum weighted average flow,network critical weighted average flow,and networkcritical running vehicles. The traffic state division method based on MFD is also achieved to divide the state into three situations:smooth,critical and congestion. For the critical state,the MFD’s stability is quantitative analyzed by the dispersion of network weightedaverage flow during the critical state. After the sub - area division of the network,the MFD’s stability is used to evaluate theeffect of the division to get the optimization division of the network. At last,the application is put forward in the downtown of HaizhuDistrict,Guangzhou. The total length of the links in the area is 25km,covering a square of 4km2. The area is divided into two sub -areas,supporting the traffic management.