基于元胞自动机模型的应急车辆行程时间

发布时间：2018-04-22 22:11

  本文选题：交通工程 + 交通流　； 参考：《长安大学学报(自然科学版)》2015年02期

【摘要】：针对应急车辆通行时交通流参数难以实时获取的问题,提出以仿真手段模拟交通运行,进而探讨随机交通条件下应急车辆行程时间的计算。在分析有应急车辆的混合交通流运行特性的基础上,增加车辆类型,引入应急车辆影响区域和普通车辆让行概率2个参数,修改车辆换道与速度更新规则,建立了双车道交通流元胞自动机模型。利用MATLAB进行数值模拟,生成不同交通密度条件下的应急车辆行程时间,并与现有计算公式进行对比分析。研究结果表明:应急车辆仅干扰其所处位置的车流运行,对双车道总体流量没有影响,在密度位于0.12~0.36范围内优先通行效果较好;在密度较小(≤0.08)或较大(≥0.24)时,应急车辆行程时间随着行驶距离的增加呈现近似正比例的增加,且密度越大,增长的斜率越大。研究发现现有针对应急车辆的距离-行程时间函数适用于低密度及高密度交通条件,而在0.12~0.20密度范围内失去效用。
[Abstract]:In order to solve the problem that traffic flow parameters are difficult to obtain in real time when emergency vehicles pass, a simulation method is proposed to simulate the traffic operation, and then the calculation of the travel time of emergency vehicles under random traffic conditions is discussed. On the basis of analyzing the operation characteristics of mixed traffic flow with emergency vehicles, the vehicle types are added, and two parameters, namely, the influence area of emergency vehicles and the probability of passing of ordinary vehicles, are introduced to modify the rules of changing lanes and updating speed of vehicles. The cellular automata model of two-lane traffic flow is established. The MATLAB is used to simulate the emergency vehicle travel time under different traffic density, and the results are compared with the existing formulas. The results show that the emergency vehicle only interferes with the traffic flow in its position and has no effect on the overall flow of the two lanes, and the priority traffic effect is better when the density is within 0.120.36, and when the density is lower (鈮，

本文编号：1789155