基于CA模型的上坡道小汽车-卡车交通拥堵特性

发布时间：2018-05-29 08:14

  本文选题：小汽车-卡车异质交通流 + 坡道　； 参考：《计算机工程与应用》2017年19期

【摘要】：研究上坡道时小汽车和卡车组成的异质交通流的特点,将卡车分为重车和空车,使用的模型是一个更为精细的基于安全驾驶的元胞自动机(CA)模型,并通过计算机数值模拟分析了不同的坡度和坡道长度下异质交通流的特征。研究得出如下的结论:上坡道会明显改变交通流特征,交通流由之前分散的阻塞带变化为多个密集的短阻塞带,并且主要集中于坡道上和坡道前段,交通拥堵显著增加,40 m长的坡道就会增加近10%的拥堵;低密度情况下,卡车加入会在一定程度上缓解拥堵,重车缓解的程度更高,高密度情况下,卡车对于拥堵比例的影响较小;交通流的拥堵比例随着纵坡度的增大而增大,这说明减少纵坡度能够缓解拥堵;此外,当坡道纵坡度一定时,可以通过适当加大坡道长度而达到减缓拥堵的效果。
[Abstract]:This paper studies the characteristics of the heterogeneous traffic flow between cars and trucks on the ramp, and divides the trucks into heavy and empty vehicles. The model used is a more elaborate Cellular Automata (CA) model based on safe driving. The characteristics of heterogeneous traffic flow under different slope and ramp length are analyzed by computer numerical simulation. It is concluded that the upper ramp changes the traffic flow characteristics significantly, and the traffic flow changes from the previously dispersed congestion zone to a number of dense short congestion zones, and is mainly concentrated on the ramp and the front section of the ramp. A significant increase in traffic congestion at 40 m long ramps will increase congestion by nearly 10%; in low density cases, truck participation will alleviate congestion to a certain extent, and heavy traffic relief will be higher, and in high density cases, The effect of truck on congestion ratio is small; the proportion of traffic congestion increases with the increase of longitudinal slope, which indicates that reducing longitudinal slope can alleviate congestion; in addition, when the gradient of ramp is constant, the proportion of traffic congestion increases with the increase of longitudinal slope. The effect of reducing congestion can be achieved by properly increasing the ramp length.
【作者单位】： 西南交通大学交通运输与物流学院;
【基金】：国家自然科学基金(No.51408509)
【分类号】：U491
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本文编号：1950154