过饱和交通干线信号多目标仿真优化研究

发布时间：2018-03-21 02:09

  本文选题：多目标优化　切入点：过饱和干线　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：城市交通拥堵问题日趋突出,干线在车流高峰时期处于过饱和状态已成常态,交叉口信号配时直接控制车辆通行,进而影响干线交通效率,如何优化过饱和交通干线的信号配时方案成为亟待研究的问题。本文针对城市交通过饱和状态下干线信号配时优化问题,分析当前已有方法的异同及适用情况,确定结合微观交通仿真实现信号配时方案多目标多变量优化。主要工作如下:(1)分析栅格地图特点,采用图像处理方法完成干线路网自动化提取与构建,结合城市交通特点研究车辆跟驰与换道模型,自主构建微观仿真环境以评价信号配时方案;(2)选用快速非支配遗传算法NSGAⅡ实现多目标优化,分析该算法中重复个体对小种群进化结果的影响,采用预选择策略剔除个体并提出快速重复检测方法,提高了算法性能;(3)基于交通信号控制相关理论,分析过饱和状态下不同优化参数及目标对交通效率的影响,提出以绿信比、相序、相位差和周期为优化参数,车辆平均时延、系统平均排队-车道长度比和系统通行能力为优化目标的交通信号优化模型,并结合仿真环境和改进算法完成对干线各交叉口信号配时方案的优化。利用采集的交通数据对由三个交叉口组成的干线进行实例验证,实验结果表明在过饱和状态下,本文提出的信号优化方法与其他方法相比不仅有效控制车辆排队长度,均衡车辆分布,同时在系统通行能力,车均时延方面表现更佳。
[Abstract]:The problem of urban traffic congestion is becoming more and more prominent, and it is normal for the trunk lines to be supersaturated during the rush hour of traffic flow. The signalling timing of intersections directly controls the traffic flow, thus affecting the traffic efficiency of the trunk lines. How to optimize the signal timing scheme of supersaturated traffic trunk lines is an urgent problem to be studied. In this paper, the similarities and differences of the existing methods and their application are analyzed in view of the problem of signal timing optimization of trunk lines under the condition of city crossing saturation. The main work is as follows: analyzing the characteristics of grid map, using image processing method to complete the automatic extraction and construction of trunk road network. According to the characteristics of urban traffic, the following and changing models of vehicles are studied, and the microscopic simulation environment is built independently to evaluate the signal timing scheme.) the fast non-dominant genetic algorithm (NSGA 鈪，

本文编号：1641787