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简单闭环路网交通流定常解
引用本文:张鹏,吕瑜佩,郭明旻,林志阳,房锐,李晓洋,张小宁.简单闭环路网交通流定常解[J].应用数学和力学,2021,42(2):123-132.
作者姓名:张鹏  吕瑜佩  郭明旻  林志阳  房锐  李晓洋  张小宁
作者单位:1上海大学 力学与工程科学学院 上海市应用数学和力学研究所, 上海 200072;2复旦大学 航空航天系, 上海 200433;3云南省交通规划设计研究院有限公司 陆地交通气象灾害防治技术国家工程实验室, 昆明 650200;4同济大学 经济与管理学院, 上海 200092
基金项目:国家自然科学基金(面上项目)(11672348;11972121);国家重点研发计划(2018YFB1600900);国家自然科学基金(重点项目)(71531011)
摘    要:基于在分岔路口满足用户均衡原理的假定,研究了由三条路段和两个交叉路口组成的简单闭环路网的交通流定常解问题,发现定常解参数及其性态依赖于路网上的车流总数:当车流总数不大于第一个临界值,或不小于第二个临界值时,定常解在每一条路段上均为密度取常数的平凡解;否则,在瓶颈路口(上游最大流量大于下游最大流量的路口)的上游路段将产生激波间断,呈排队等候现象.对分岔路口和交汇路口为瓶颈的情况,分别给出了完整的解析结果

关 键 词:LWR模型    用户均衡原理    交通分配模型    激波间断    瓶颈效应
收稿时间:2020-04-06

Steady-State Solutions of Traffic Flow in a Simple Circled Road Network
Abstract:The steady-state solutions of traffic flow in a circled road network composed of 3 road sections and 2 junctions were studied under the assumption of the user equilibrium principle at the diverging junction. The results show that, the solution parameters and the dynamic behavior depend continuously on the total number of vehicles in the network. More precisely, the solution suggests a constant density in each road section when the total number of vehicles is not greater than the 1st critical density and not smaller than the 2nd critical density. When the total number of vehicles is between the 2 critical densities, the shock discontinuity or queuing appears upstream towards a bottleneck or a junction where the upstream capacity is greater than the downstream capacity. Complete analytical results were presented with the diverging and the merging junctions as bottlenecks, respectively.
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