基于上海延 安高架录像资料的交通流实测研究.PDFVIP

孙振旭，等：高速列车气动噪声的计算研究 DOI ：10.3969/j.issn.1000-4874.2010.05.015 基于上海延安高架录像资料的交通流实测研究* 林展熙, 吴正, 杨朝晖, 郑贤清 （复旦大学力学与工程科学系, 上海 200433, Email: lzxqvy@ ） 摘 要：据上海延安高架路段的交通流录像资料提取的 28000 余组实测数据，作出流量-密度图，发现在整体低密 度时段，流量-密度图可以用 Kerner 指出的自由流阶段的曲线表示；随着路段整体平均密度的递增，自由流特性越来越 不明显。在整体平均密度较低的情况下，存在一定数量的高速度高密度数据。利用观测得到的大量数据，在按密度划 分的不同区间内对已有的多个速密关系函数进行最优筛选，得到一种新的分段平衡函数的表达式。最后提出了基于实 测数据计算 MCLWR 模型中各层次车辆所占比例和速度系数的方法。 关键词：交通流模型；实测数据；流量-密度图；分段平衡函数；MCLWR 模型；车辆分层标准 中图分类号：O359 文献标识符：A A study on traffic flow models based on measure video of Yanan Expressway of Shanghai LIN Zhan-xi, WU Zheng, YANG Chao-hui, ZHENG Xian-qing (Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China) Abstract: It was drawn in this paper that over 28000 “car velocity-headway distance” data pairs were obtained from the long time video recordings of a section in Yanan Expressway of Shanghai with three traffic circumstances: morning peak hour; morning low traffic hour; afternoon hour. Compared with Kerner’s flow-density traffic flow model, it was found that as the samples’ average density increases, the free flow’s curvilinear flow-density relation that kerner says becomes weaker and nonlinear charater becomes stronger. The real measured data support and enlight the study of traffic flow models. On the aspect of macroscopical differential models, the present paper proposes a method , based on lots of data’s statistical charater, to compare and study the known equilibrium functions and then to choose the best-fit function in each density section to form a piecewise function, which is much closer to China’s present traffic