车流随机性对协调系统控制效果的影响
发布时间：2018-08-03 19:02
【摘要】：为了提高协调系统运行的稳定性及控制效果,针对车流随机特性,采用理论分析和仿真计算相结合的方式,探讨车流速度波动和车流到达率波动2个因素对协调系统控制效果的影响机理。理论分析中,将变动的车流速度转化为区间数形式,根据单向协调相位差求取公式,得到理想相位差的变动区间;根据相位清空可靠度计算公式,得到车流到达率波动与最佳周期、协调相位绿灯时间、车均延误时间、最大排队长度等的解析关系,并进一步借助双向协调系统中求取相位差的数解法,得到关于车流到达率波动方差的相位绿时差。仿真分析中,利用MATLAB与VISSIM搭建仿真平台,选取2个几何线形规则的信号交叉口,制定模拟协调控制方案,选取仅改变车流速度、仅改变车流到达率、同时改变车流速度和到达率这3种情况进行仿真,以车均停车时间、平均排队长度、车均停车次数、车均延误时间为指标,评价其对协调系统控制效果的影响。研究结果表明:车流速度波动方差、车流到达率波动方差与控制效果均呈正相关关系,车流速度波动的影响大于车流到达率波动的影响,两者同时波动时不是简单的叠加关系,而是相互抵消影响,其控制效果介于2种情况之间;仅车流到达率波动的情况下,协调相位双侧车流到达率波动时,控制效果优于单侧车流到达率波动;车流处于自由流与拥挤流之间切换状态时,控制效果优于拥挤流状态,劣于自由流状态。
[Abstract]:In order to improve the stability and control effect of the coordinated system, according to the random characteristics of the vehicle flow, the combination of theoretical analysis and simulation calculation is adopted. The influence mechanism of two factors on the control effect of the coordinated system is discussed, that is, the fluctuation of the vehicle flow velocity and the fluctuation of the arrival rate of the vehicle flow. In theoretical analysis, the variable velocity of vehicle flow is transformed into the form of interval number, the formula is obtained according to the phase difference of unidirectional coordination, the variable interval of ideal phase difference is obtained, and the formula of reliability of phase emptying is calculated. The analytical relationships between the fluctuation of the arrival rate and the optimal period, the coordinated phase green time, the average delay time, the maximum queue length, etc., are obtained, and the numerical solution of the phase difference in the bidirectional coordination system is obtained. The phase green time difference about the variance of arrival rate fluctuation is obtained. In the simulation analysis, MATLAB and VISSIM are used to build the simulation platform, two signal intersections with geometric linear rules are selected, and the simulation coordinated control scheme is formulated, and only the speed of the vehicle flow and the arrival rate of the traffic flow are changed. At the same time, the vehicle flow speed and arrival rate are changed to simulate. The average stop time, the average queue length, the average stop times and the average delay time of the vehicle are taken as the indexes to evaluate its influence on the control effect of the coordination system. The results show that the variance of vehicle flow velocity fluctuation, the variance of vehicle flow arrival rate fluctuation and the control effect are all positive correlation, and the influence of vehicle flow velocity fluctuation is greater than that of vehicle flow arrival rate fluctuation, and it is not a simple superposition relation when they fluctuate at the same time. The control effect is between the two conditions, and the control effect is better than that of the one-sided vehicle flow when the arrival rate fluctuation of the two sides of the vehicle flow is coordinated with the fluctuation of the arrival rate of the two sides of the vehicle flow only in the case of the fluctuation of the arrival rate of the vehicle flow. When the traffic flow is in the state of switching between the free flow and the crowded flow, the control effect is better than that of the crowded flow and is inferior to the free flow.
【作者单位】： 长安大学公路学院;江西农业大学园林与艺术学院;盐城工学院土木工程学院;江苏建筑职业技术学院建筑工程管理学院;
【基金】：国家自然科学基金项目(51408049) 徐州市社会科学研究项目(17XSS-049)
【分类号】：U491.54
，
本文编号：2162708
[Abstract]:In order to improve the stability and control effect of the coordinated system, according to the random characteristics of the vehicle flow, the combination of theoretical analysis and simulation calculation is adopted. The influence mechanism of two factors on the control effect of the coordinated system is discussed, that is, the fluctuation of the vehicle flow velocity and the fluctuation of the arrival rate of the vehicle flow. In theoretical analysis, the variable velocity of vehicle flow is transformed into the form of interval number, the formula is obtained according to the phase difference of unidirectional coordination, the variable interval of ideal phase difference is obtained, and the formula of reliability of phase emptying is calculated. The analytical relationships between the fluctuation of the arrival rate and the optimal period, the coordinated phase green time, the average delay time, the maximum queue length, etc., are obtained, and the numerical solution of the phase difference in the bidirectional coordination system is obtained. The phase green time difference about the variance of arrival rate fluctuation is obtained. In the simulation analysis, MATLAB and VISSIM are used to build the simulation platform, two signal intersections with geometric linear rules are selected, and the simulation coordinated control scheme is formulated, and only the speed of the vehicle flow and the arrival rate of the traffic flow are changed. At the same time, the vehicle flow speed and arrival rate are changed to simulate. The average stop time, the average queue length, the average stop times and the average delay time of the vehicle are taken as the indexes to evaluate its influence on the control effect of the coordination system. The results show that the variance of vehicle flow velocity fluctuation, the variance of vehicle flow arrival rate fluctuation and the control effect are all positive correlation, and the influence of vehicle flow velocity fluctuation is greater than that of vehicle flow arrival rate fluctuation, and it is not a simple superposition relation when they fluctuate at the same time. The control effect is between the two conditions, and the control effect is better than that of the one-sided vehicle flow when the arrival rate fluctuation of the two sides of the vehicle flow is coordinated with the fluctuation of the arrival rate of the two sides of the vehicle flow only in the case of the fluctuation of the arrival rate of the vehicle flow. When the traffic flow is in the state of switching between the free flow and the crowded flow, the control effect is better than that of the crowded flow and is inferior to the free flow.
【作者单位】： 长安大学公路学院;江西农业大学园林与艺术学院;盐城工学院土木工程学院;江苏建筑职业技术学院建筑工程管理学院;
【基金】：国家自然科学基金项目(51408049) 徐州市社会科学研究项目(17XSS-049)
【分类号】：U491.54
，
本文编号：2162708
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2162708.html
