Effect of the optimal velocity function on traffic phase transitions in lattice hydrodynamic models

Effect of the optimal velocity function on traffic phase transitions in lattice hydrodynamic models
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最优速度函数对晶格流体动力学模型中交通相变的影响

DOI:
10.1016/j.cnsns.2008.06.017
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发表时间:
2009-05
期刊:
非线性科学与数值模拟通讯(英文版)
影响因子:
--
通讯作者:
Li, Zhipeng
Li, Zhipeng
中科院分区:
其他
文献类型:
--
作者:
Han, Xianglin;Dai, Shiqiang;Li, Xingli;Li, Zhipeng

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对原有的交通流格点流体动力学模型进行了扩展,使之能考虑驾驶员复杂的加速行为。提出了一种新的最优速度函数,该函数考虑了阶跃加速度效应,能更好地拟合观测数据。利用线性稳定性理论,得到了这两个模型的稳定性条件。结果表明,修正后的最优速度函数对中性稳定曲线和交通相变有显着影响。在一定的车辆密度和驾驶员敏感区域内,会出现三稳态。此外,多相的性质还取决于最优速度函数的非对称性,多相转变的级数与最优速度函数的转折点密切相关。数值仿真结果验证了分析结果的正确性和有效性。
The original lattice hydrodynamics models of traffic flow are extended to take into account the complex acceleration behavior of drivers. A new optimal velocity function which considers the stepwise acceleration effect and fits the observed data better is introduced. The stability conditions of these two models are obtained by using the linear stability theory. It is shown that the modified optimal velocity function has a remarkable influence on the neutral stability curve and the traffic phase transitions. In a certain vehicle’s density and driver’s sensitivity region, tri-stable states will occur. In addition, the properties of the multiple phases also depend on the asymmetry of the optimal velocity function and the stage number of multi-phase transitions is closely related to the turning points of the optimal velocity function. The validity and correctness of the analytical results is confirmed by numerical simulations.
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发表时间: 1999-03
影响因子: 3.3
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