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一种改进的一维元胞自动机交通流模型及减速概率的影响
引用本文:薛郁,董力耘,戴世强.一种改进的一维元胞自动机交通流模型及减速概率的影响[J].物理学报,2001,50(3):445-449.
作者姓名:薛郁  董力耘  戴世强
作者单位:(1)上海大学上海市应用数学与力学研究所,上海200072; (2)上海大学上海市应用数学与力学研究所,上海200072,广西大学物理系,南宁530003
基金项目:国家自然科学基金(批准号:19872042和19932020)资助的课题.
摘    要:在Nagel-Schrekenberg单车道元胞自动机交通流模型的基础上,考虑车辆之间的相对运动以及车辆减速概率对交通状态的影响,提出了一种改进的单车道元胞自动机交通流模型.并以该模型进行计算机模拟,结果表明,在车流状态的演化过程中,通过确定减速概率与车辆密度的指数v关系来控制车流量,不同的v值车流量不同,对车辆运动出现堵塞相的相变点有影响.当v约为0.75时,模拟结果与实测结果符合.随着车辆密度的增加,车辆的局域聚集程度加大,平均速度下降增大,将出现不稳定的车辆聚集的堵塞相.在车辆的运动过程中,车流的运 关键词: 交通流 元胞自动机 减速概率 堵塞相

关 键 词:交通流  元胞自动机  减速概率  堵塞相
文章编号:1000-3290-2001-50(03)-0445-05
收稿时间:2000-07-10
修稿时间:2000年7月10日

AN IMPROVED ONE-DIMENSIONAL CELLULAR AUTOMATON MODEL OF TRAFFIC FLOW AND THE EFFECT OF DECELERATION PROBABILITY
XUE Yu,Dong Li-yun,DAI SHI-QIANG.AN IMPROVED ONE-DIMENSIONAL CELLULAR AUTOMATON MODEL OF TRAFFIC FLOW AND THE EFFECT OF DECELERATION PROBABILITY[J].Acta Physica Sinica,2001,50(3):445-449.
Authors:XUE Yu  Dong Li-yun  DAI SHI-QIANG
Abstract:Based upon the single-lane traffic cellular automaton (CA) model introduced by Negel and Schreckenberg,an improved single-lane traffic CA model has been proposed by the consideration of the relative motion of vehicles and the relation of deceleration probability with the density.Numerical simulations have been carried out.The results show the complicated evolution process of traffic flow.The flow of vehicles can be controlled by the definition of the relation between deceleration probability and the exponet v of density Pnoise~ρv.Different values of v have different effect on the critical point from free phase to jam phase.The simulation agrees with the measurement as v is about 0.75.With the increase of vehicles and the evolution process of traffic flow,the free and jam phases will become unsteady and appear alternatively,similiar to the propagation of wave.
Keywords:traffic flow  cellular automaton  probability of decelcration  jam phase
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