Taming macroscopic jamming in transportation networks
Taming macroscopic jamming in transportation networks
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DOI：
10.1088/1742-5468/2015/06/p06013
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Takahiro Ezaki;Ryosuke Nishi;K. Nishinari
中科院分区：
文献类型：
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作者：
Takahiro Ezaki;Ryosuke Nishi;K. Nishinari
在交通网络中，经常观察到自发的拥堵转变，例如在城市道路网络和机场网络中。由于这种不稳定性，流量分配在宏观层面上严重不平衡。为了缓解拥塞，我们考虑了一种简单的控制方法，即暂时关闭拥塞节点，并研究它对整个系统的影响。根据节点关闭和开放的时间以及网络的拥塞程度，系统会显示三个不同的阶段：自由流阶段、受控阶段和死锁阶段。结果表明，当系统处于受控阶段时，平均流量得到显著改善，而当系统处于死锁阶段时，流量降至零。我们研究了控制方法如何增加网络流量，并解析地得到了它们的过渡边界。
In transportation networks, a spontaneous jamming transition is often observed, e.g. in urban road networks and airport networks. Because of this instability, flow distribution is significantly imbalanced on a macroscopic level. To mitigate the congestion, we consider a simple control method, in which congested nodes are closed temporarily, and investigate how it influences the overall system. Depending on the timing of the node closure and opening, and congestion level of a network, the system displays three different phases: free-flow phase, controlled phase, and deadlock phase. We show that when the system is in the controlled phase, the average flow is significantly improved, whereas when in the deadlock phase, the flow drops to zero. We study how the control method increases the network flow and obtain their transition boundary analytically.