周期边界条件下多速混合车流的双车道元胞自动机模型  

Cellular automaton model for mixing traffic in two-lane system with period boundary condition

作　　者：王守宝[1] 钱勇生[1] 亢红霞[1] 

机构地区：[1]兰州交通大学交通运输学院,兰州730070

出　　处：《计算机应用》2008年第10期2658-2660,共3页journal of Computer Applications

摘　　要：在对现有经典交通流元胞自动机模型进行总体分析的基础上,结合我国部分高速公路已不再有行车道和超车道之分的特点,重新标定了元胞长度、运行车速、随机慢化机制和换道超车规则,构建了周期边界条件下多速混合车流的双车道元胞自动机模型,通过计算机模拟分析了交通流三参数之间关系,大型货车占有率对交通流的影响及大货车占有率不变且交通流密度变化的情况下的时空斑图比较。结果表明,在高速公路不分行车道和超车道的情况下,大型货车的占有率对混合车流的速度影响不大,车辆的随机减速概率会对混合车流的运动状态起重要作用。Based on the analysis of the existing classical cellular automaton model of traffic flow, considering the characteristic of part of expressways without differences between running lane and passing lane, we demarcated the parameters such as length of the cellar automaton, operation speed, random slow mechanism and the max speed etc, set up the vehicle＇s generating function and vehicle changing lane regulation, and established Cellular Automaton （CA） model for mixing traffic in two-lane system with period boundary condition. Then we analyzed the relation among three parameters of traffic flow through computer simulation, and the impact of the occupation rate of large-scale freight vehicles on traffic flow. We compared the space-time evolution figure with density changing under the same occupation of large-scale vehicles. The result shows that the occupation rate of large-scale freight vehicles has little influence on the speed of nrixed traffic flow in the situation that the expressways have no differences between running ways and passing ways. The stochastic deceleration probability of the vehicle plays an important role in the motion state of mixed traffic flow.

关 键 词：混合车流 元胞自动机 大车占有率 计算机仿真 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]