城市快速路交通流速度-密度模型研究  

Study on Speed-density Model of Traffic Flow on Urban Freeways

作　　者：曹亚康[1] 刘立英[1] 王卫卫[1] 

机构地区：[1]北京交通大学城市交通复杂系统理论与技术教育部重点实验室,北京100044

出　　处：《物流技术》2013年第4期166-169,共4页Logistics Technology

基　　金：北京交通大学基本科研业务费(2012JBM065;2012JBM055;2012JBM062)

摘　　要：通过对北京市三环路的实测交通流数据进行统计分析,建立分相位的城市道路交通流流量、速度和密度相关关系模型。首先根据不同密度下速度分布的标准差和速度跃迁点来确定不同交通流相位的临界密度,然后应用SPSS统计软件分析各个交通流相位的数据散点分布。研究发现不同车流密度下车辆速度分布标准差明显变化之处为自由流与谐动流的分界点,以及谐动流与同步流的分界点,后者与速度跃迁点一致。根据拟合精度分别给出了各交通流相位的速度-密度关系的最佳拟合曲线,还利用流量、速度和密度之间的关系得到了流量-密度的关系模型。This paper analyzes the data of the Beijing 3rd Ring Road, and then establishes the model of the relationship among traffic flow volume, traffic speed and density. First of all, we put forward the method of ascertaining the critical density of traffic flow phases according to the std. deviation of the speed distribution of each density and the speed transition and then analyze the traffic flow data of each phase using SPSS. Eventually, we conclude that the transition of the std. deviation of the speed distribution of each density is the boundary between free flow and coherent-moving flow and the boundary between coherent-moving flow and synchronized flow, and the latter is consistent with the speed transition. We then present the optimal fitting curve of each phase based on the R Square. Moreover, we propose the flow-density model of each phase according to the relationship among flow speed and density.

关 键 词：城市交通 交通相位 基本图 数据拟合 交通流 速度-密度模型 

分 类 号：U491.112[交通运输工程—交通运输规划与管理]