城市快速路改进型元胞传输模型及仿真  

An Improved Cell Transmission Model for Urban Expressway and Simulation

作　　者：杨泳[1] 严余松[1] 户佐安[1] 古沐松[2] 

机构地区：[1]西南交通大学交通运输与物流学院,四川成都610031 [2]西南交通大学信息科学与技术学院,四川成都610031

出　　处：《公路交通科技》2015年第6期135-141,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(61104175)

摘　　要：为提高元胞传输模型的适用范围和城市快速路不规则几何形状交通流的传播规律,根据模型元胞间交通流守恒的基本原理,提出了改进型元胞传输模型。通过引入元胞长度和元胞交通流密度两个参数,克服了原元胞传输模型需要所有元胞统一长度的局限性。同时,迟滞环反映了自由流和拥挤流之间的转换关系,是典型的交通现象之一。结合传统的基本图方法和三相交通流理论,构建了考虑迟滞现象的改进型元胞传输模型。仿真结果表明:考虑迟滞现象的改进模型反向波速误差小于3%,满足城市快速路交通流传播规律的要求。In order to enhance the application scope of cell transmission model, and the propagation pattern of irregular shaped traffic flow in urban expressway, an improved cell transmission model is proposed based on the basic principle of traffic flow conservation between cells in original model. Two parameters including cell length and cell density are introduced into the improved model to avoid the strict uniform length limitation of all ceils in the original cell transmission model. Meanwhile, hysteresis loop which reflects the conversion between free flow and congestion flow is a typical traffic phenomenon. Combining traditional fundamental diagram approach and 3-phase traffic flow theory, the improved cell transmission model considering the hysteresis characteristics is set up. The simulation result indicates that the incorrect rate of the backward wave calculated by the improved cell transmission model with meets the requirements of traffic flow propagation pattern hysteresis characteristics is less than 3%, which of urban expressway.

关 键 词：交通工程 城市快速路 元胞传输模型 改进型 迟滞环 交通流 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程] U491[自动化与计算机技术—控制科学与工程]