环形交叉口通行能力及其仿真研究

发布时间：2018-05-21 19:35

本文选题：环形交叉口 + 通行能力　；参考：《兰州交通大学》2017年硕士论文

【摘要】：环形交叉口曾经在上世纪八九十年代流行一时,但是随着社会发展,城市交通量剧增,常规环形交叉口越来越不适应当下的交通环境,其通行效率下降严重。为改善这种局面,国内提出对环形交叉口进行信号控制:单重信号控制(仅在进口道处对入环车辆进行控制)和左转二次控制(对左转车在环道上实施二次控制)来改善环形交叉口的通行状况,然而改造现有环岛时,应该选择什么形式,其通行能力应该如何计算,国内外这领域的研究比较少,论文从如下方面对环形交叉口通行能力问题进行了研究:(1)论文对目前环岛在国内外的发展和研究现状进行了介绍,对目前已有的无信号环岛通行能力的模型进行了总结和分析,并通过对环岛运行规则的剖析,基于停车线法,推导了信号环岛通行能力模型,并对模型中的相关参数运用MATLAB软件编程进行分析,得出了各参数与通行能力之间的关系规律。(2)论文对环岛信号的配时做了着重研究,对单重信号控制和左转二次控制环岛的相位相序确定以及绿灯时长、绿灯间隔时间确定等进行了详细分析,并根据其运行特性,推导了配时各个参数的计算方法及相应的计算公式。(3)论文运用VISSIM交通仿真软件对几何条件介于信号与无信号控制之间的典型交叉口在不同左转率、不同流量和控制方式下的通行能力和延误进行了仿真研究,得出了环岛在不同控制方式不同左转率和流量下的特点,为环岛控制方式的甄选提供了参考。(4)本文对实例及其交通现状进行了分析,运用本文的研究方法和结论,根据现状,提出了运用二次控制的改善方案。运用VISSIM对比了所提方案与无信号控制方案与单信号控制方案的改善成效,验证了本文研究结论的合理性。
[Abstract]:The circular intersection was popular in 1980s and 1990s, but with the development of society, the traffic volume of the city increased dramatically, and the conventional intersection became more and more unsuitable for the current traffic environment, and its traffic efficiency declined seriously. To improve the situation, In order to improve the traffic condition of annular intersection, the single signal control (only at the entrance road) and the second left turn control (the second control of the left turn vehicle on the ring road) are put forward to control the signal at the roundabout. However, when transforming the existing ring islands, what form should be chosen and how their capacity should be calculated? there has been relatively little research in this field at home and abroad. In this paper, the capacity of roundabout is studied from the following aspects. (1) the paper introduces the development and research status of ring island at home and abroad, and summarizes and analyzes the existing model of capacity of ring island without signal. Based on the analysis of the operation rules of the ring island, the traffic capacity model of the signal ring island is deduced based on the parking line method, and the related parameters in the model are analyzed by using MATLAB software. The relationship between the parameters and the capacity is obtained. (2) in this paper, the timing of the annular signal is studied emphatically, and the phase sequence and the green time of the loop are determined by the single signal control and the left turn secondary control. The determination of green light interval time is analyzed in detail, and according to its operation characteristics, This paper deduces the calculation method of each parameter of timing and the corresponding calculation formula. (3) this paper uses VISSIM traffic simulation software to study the different left turn rate of typical intersection with geometric condition between signal and no signal control. The traffic capacity and delay under different flow and control modes are simulated, and the characteristics of the ring island under different left turn rate and flow rate are obtained. In this paper, the example and traffic status are analyzed. According to the research methods and conclusions, the improvement scheme of using secondary control is put forward. VISSIM is used to compare the improvement results between the proposed scheme and the non-signal control scheme and the single-signal control scheme, which verifies the rationality of the conclusion of this paper.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U491.23

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