交通运输研究2018，Vol.4Issue(6)：31-37,7.DOI:10.16503/j.cnki.2095-9931.2018.06.005
基于边界速度的城市路网承载力估计方法
Estimation Algorithm of Urban Road Network Capacity Based on Boundary Network Velocity
摘要
Abstract
In order to estimate the maximum volume of vehicles existing in network at an instant, the relationship between the volume of online vehicles and average network speed was presented, and the boundary network speed was deduced according to this relationship at first. Secondly, the probabilistic model of vehicle speeds distribution in network was established, and a dynamic model that depicts the parameters of vehicle speed distribution varying with average network speed was proposed. Furthermore, the boundary speed was introduced to the dynamic model to obtain the according parameter values of vehicle speed distribution, so as to obtain the speed distribution. The vehicle speed distribution was matched with the density-speed dependence curve to obtain the ratio of vehicle volume in different traffic flow densities to the total vehicle volume. The vehicle volumes in different densities were obtained by multiplying the total vehicle volume and density distribution. The sum of space headway of vehicles in different density equals to the road mileage weighted with the number of lanes. Then the total vehicle volume was obtained by solving equation. Beijing was taken as an example, more than 12 000 private cars were taken as floating cars. The area covered 1 368 square kilometers. The estimations of sub networks of expressways, arterials, branches were presented respectively. The result shows that the proposed method has the advantages of both high calculation efficiency and flexible implement, and adapts to large scale network.It has broad prospect in application of traffic analysis, simulation and control.关键词
交通工程/城市路网/路网承载力/边界速度/速度分布/动态模型Key words
transportation engineering/urban road network/road network capacity/boundary of network velocity/distribution of vehicle speed/dynamic model分类
交通工程引用本文复制引用
张彭,孙建平,雷方舒,全宇翔,朱广宇..基于边界速度的城市路网承载力估计方法[J].交通运输研究,2018,4(6):31-37,7.基金项目
国家重点研发计划项目(2017YCF0803305-06) （2017YCF0803305-06）
国家自然科学基金项目(61572069) （61572069）
中央引导地方科技发展专项(Z161100005116006) （Z161100005116006）
北京市委市政府重点工作应急预启动专项(Z171100004417024) （Z171100004417024）
北京市科技计划项目(Z181100005818001) （Z181100005818001）
