突发交通事件下城市快速路可变限速与匝道的协调控制

发布时间：2018-08-19 16:43

【摘要】：通过总结可变限速控制和入口匝道控制前人研究成果的基础上,考虑到突发交通事件占用车道数对通行能力的影响,交通事件影响范围内的匝道调节,交通事件路段车辆排队长度等因素,对经典的METANET宏观动态交通流模型进行改进,使之能够符合交通事件下城市快速路交通流运行状态。在此基础上建立突发交通事件下协调控制模型,并选用遗传算法求解。最后对航天桥北到苏州桥北的西三环快速路的一段进行了实例仿真。主要有以下几个任务:突发性交通事件下的快速路可变限速与匝道协调控制系统的建立。根据交通事件下不同的功能需求划分相应的功能模块,根据突发交通事件这一研究重点,给出城市快速路应对突发交通件的协调控制系统框架结构。改进宏观METANET交通流模型。结合前人的研究成果和实例研究的需要,选择了宏观动态交通流模型METANET模型,考虑分析突发交通事件可能造成的影响,对其进行改进,使之符合突发交通事件下快速路交通运行状况。突发交通事件下城市快速路协调控制模型的建立。将可变限速控制与入口匝道调节嵌入到事件下改进的的METANET模型中去,选取事件路段车辆排队长度、路网的总耗时TTS为目标函数,并作为协调控制模型的性能评价指标。求解模型并进行仿真评价。利用遗传算法求解协调控制模型,并用MATLAB软件对北京西三环一段快速路进行实例仿真。结果表明:本文建立的突发交通事件下城市快速路协调控制模型可以有效减小快速路交通事件路段车辆排队长度,减小路网的总耗时,使事件上游路段交通密度变化更为平稳。
[Abstract]:On the basis of summing up the previous research results of variable speed limit control and on-ramp control, considering the influence of the number of lanes occupied by sudden traffic events on traffic capacity, the ramp adjustment within the impact range of traffic events is considered. The classical METANET macroscopic dynamic traffic flow model is improved to fit the traffic flow state of urban expressway under traffic events. On this basis, a coordinated control model for traffic emergencies is established, and genetic algorithm is used to solve it. Finally, the simulation of a section of the West third Ring Expressway from the north of the spaceflight bridge to the north of the Suzhou Bridge is carried out. The main tasks are as follows: the establishment of the coordinated control system between the variable speed limit and the ramp under the sudden traffic events. According to the different functional requirements of traffic events, the corresponding functional modules are divided. According to the research emphasis of traffic emergencies, the framework of coordinated control system for urban expressway to deal with traffic emergencies is presented. Improved macro METANET traffic flow model. Combined with the previous research results and the needs of the case study, the METANET model of macro-dynamic traffic flow model is selected, considering the possible impact of traffic emergencies, and improving it. Make it accord with traffic condition of expressway under sudden traffic event. Establishment of coordinated Control Model of Urban Expressway under sudden Traffic events. The variable speed limit control and the on-ramp adjustment are embedded into the improved METANET model under the event, and the queue length of the vehicle in the event section is selected, the total time consuming TTS of the road network is taken as the objective function, and the performance evaluation index of the coordinated control model is taken as the index. The model is solved and evaluated by simulation. Genetic algorithm is used to solve the coordinated control model and the MATLAB software is used to simulate the first section of Beijing Xisanhuan Expressway. The results show that the coordinated control model established in this paper can effectively reduce the length of vehicle queue and the total time consuming of the road network, and make the traffic density change more smoothly in the upstream section of the event.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U491

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