诱导条件下的动态交通分配方法研究
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摘要
随着城市交通问题日益突出,交通诱导成为了改善路网均衡度状态、减少局部交通拥堵、提高城市交通系统运行效率的重要手段。动态交通分配是通过路网供给状况以及交通需求状况分析其最优的交通流量分布形式,从而为动态路径诱导和交通流控制提供依据。
     本文使用单队列排队的路段输入输出模型,通过路段饱和度定义了路段的状态,通过细分时间微元逐次扫描并跟踪分配量的运动,设计了以路段状态变化表为输出的动态交通分配算法,并通过离散时段与梯阶化方法说明了实际情况下算法的输入方式。
     针对实际的诱导条件,本文研究了诱导信息对出行者路径选择的影响,提出了基于预测路网状态的VMS诱导信息发布策略,并通过加入双重扫描过程建立了基于上述诱导策略的诱导条件下动态交通分配算法并进行了编程实现。
     在实例路网的仿真试验中,本文将算法中十二种参数分为了路段属性参数与诱导属性参数两类,并通过改变诱导属性参数分析了基于预测路网状态的VMS诱导策略对与改善路网均衡度的效果,最后通过引入贪心策略对动态交通分配进行类比分析,提出了诱导条件下动态交通分配的诱导有效补偿范围概念。
As the urban traffic congestion becoming more and more serious, route guidance has become an important way to alleviate the local traffic congestion and to improve equilibrium in road networks and efficiency of urban traffic system. Dynamic traffic assignment (DTA) is a kind of analyzing methods based on network supply and traffic demands in order to find the optimal network equilibrium which could support the traffic guidance and control.
     This paper employs link saturation to define the link status based on the classic road output flow model. An algorithm of DTA outputting the road status changing list is presented based on tracking the movement of each amount. Then the paper explains the input mode under practical circumstance by discrete periods and two-sequential method.
     Moreover, this paper discusses the impact of guiding information on route choices and proposes a VMS route guidance strategy about displaying the network's future status, and then develops DTA algorithm under route guidance conditions by designing the double-scanning process and completes the corresponding simulation program.
     In a simulation case, twelve parameters have been classified into two groups:road properties and guidance properties. The effect of the VMS route guidance strategy about displaying the network future status in improving the network equilibrium has been analyzed under several different combinations of guidance property parameters. Finally, by analyzing and comparing DTA process to the greedy policy a concept in the DTA under guidance condition named the effective compensation range of guidance is proposed.
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