偶发性拥挤下城市道路交通流控制研究

发布时间：2018-05-06 16:52

本文选题：偶发性拥挤 + 交通流控制　；参考：《西安工业大学》2017年硕士论文

【摘要】：偶发性拥挤是指由于突发事件的出现,导致道路实际通行能力降低,从而引发的交通拥挤现象。偶发性拥挤对交通流有较大影响,研究偶发性拥挤下的城市道路交通流控制,对提高交通流运行效率具有重要的理论意义和实际价值。现有偶发性拥挤下的城市道路交通流控制以花费总时间最小、通行能力最大、限制密度为目标,考虑交通流量、实际通行能力对交通流进行控制。本文针对实际中发生偶发性拥挤时,可通行车道数减少,实际通行能力降低,车流密度增加,且考虑偶发性事故持续时间对偶发性拥挤下交通流有影响的情形,研究以通行能力最大为目标的城市道路交通流控制。论文的成果如下。基于尖点突变的偶发性拥挤下城市道路交通流控制。针对偶发性拥挤的特点,运用突变理论,以交通运行量在承载容量中的占有率为状态变量,以车流流量变化率、路段剩余通行能力的变化率为控制变量,构建偶发性拥挤下城市道路交通流尖点突变模型,选择合适的路阻函数,采用动能函数对交通流拥挤的临界状态进行分析,得到突变临界交通流量和突变稳定交通流量,并给出交通流量限制率对交通流进行控制,提出交通流控制方案。以西安市南二环交通状况的实地测量为实例,分析不同情形下交通流运行状态,说明模型应用的有效性。结果表明,模型可以较好的控制交通流,路阻函数对结果有较大影响,就适用范围而言,本文路阻函数参数根据具体数据拟合得到,适用于不同道路类型,更为符合实际。基于燕尾突变的偶发性拥挤下城市道路交通流控制。由于偶发性事故持续时间对交通流有较大影响,因此,考虑偶发性事故持续时间这个控制因素,以交通运行量在承载容量中的占有率为状态变量,以车流流量变化率、路段剩余通行能力的变化率、时间变化率为控制变量,构建偶发性拥挤下城市道路交通流燕尾突变模型,分平面对燕尾突变的分叉集进行讨论,从而对交通流拥挤的临界状态进行分析,并给出交通流控制方案。以西安市南二环交通状况的实地测量为实例,分析不同情形下交通流运行状态,说明模型应用的有效性。结果表明,当偶发性事故持续时间超过10分钟时,容易导致交通流突变。
[Abstract]:Accidental congestion is a phenomenon of traffic congestion caused by the occurrence of unexpected events, which leads to the reduction of actual traffic capacity. Accidental congestion has great influence on traffic flow. The study of urban road traffic flow control under accidental congestion has important theoretical and practical value to improve the efficiency of traffic flow. The existing urban road traffic flow control under accidental congestion takes the minimum total time, the largest traffic capacity and the limited density as the goal. Considering the traffic flow, the actual traffic capacity controls the traffic flow. In this paper, when accidental congestion occurs, the number of passable lanes is reduced, the actual capacity is reduced, and the traffic density is increased, and the influence of the duration of accidental accidents on the traffic flow under accidental congestion is considered in this paper. The control of urban road traffic flow with maximum capacity is studied. The results of the paper are as follows. Urban road traffic flow control under accidental congestion based on cusp mutation. In view of the characteristics of accidental congestion, using the catastrophe theory, taking the occupancy of traffic capacity in the carrying capacity as the state variable, the change rate of the traffic flow flow and the change rate of the remaining traffic capacity of the road as the control variable. In this paper, the cusp catastrophe model of urban traffic flow under accidental congestion is constructed, the proper road resistance function is selected, and the critical state of traffic congestion is analyzed by using kinetic energy function, and the catastrophe critical traffic flow and sudden stable traffic flow are obtained. The traffic flow is controlled by the limit rate of traffic flow, and the scheme of traffic flow control is put forward. Taking the field measurement of traffic situation in South second Ring Road of Xi'an City as an example, the traffic flow running state under different conditions is analyzed, and the validity of the application of the model is illustrated. The results show that the model can control the traffic flow well, and the road resistance function has a great influence on the results. In terms of the applicable range, the parameters of the road resistance function are fitted according to the specific data, which are more suitable for different road types and are more in line with the reality. Urban road traffic flow control under accidental congestion based on swallowtail mutation. As the duration of accidental accidents has a great influence on traffic flow, considering the control factor of the duration of accidental accidents, the occupancy of traffic volume in the carrying capacity is taken as the state variable, and the change rate of traffic flow is taken as the state variable. The change rate of residual traffic capacity and the change rate of time are the controlling variables. The catastrophe model of the swallowtail of urban traffic flow under accidental congestion is constructed and the bifurcation set of the abrupt change of the tail is discussed in the plane. The critical state of traffic congestion is analyzed and the traffic flow control scheme is given. Taking the field measurement of traffic situation in South second Ring Road of Xi'an City as an example, the traffic flow running state under different conditions is analyzed, and the validity of the application of the model is illustrated. The results show that when the duration of accidental accidents is longer than 10 minutes, the traffic flow is prone to sudden change.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U491

【参考文献】