城市快速路及匝道衔接段交通流建模仿真

Traffic Flow Modeling and Simulation of Urban Expressway and its Ramp

在城市快速路中,由于其进出口匝道相对密集、路况较复杂、限速较低等特点,以往的模型不能很好地适应其特点。为解决上述问题,提出综合集成法构建的多分辨率交通仿真框架,利用集合论建立的多分辨率交通模型及子模型(宏观模型、中观模型、微观模型)能够更好地描述城市快速路的实际运行状态。最后,通过C++实现该仿真模型系统平台,并通过上海市南北高架东线作为研究对象,分别建立该路段的宏观、中观、微观交通仿真模型,通过对三个子模型的流量与速度关系分析交通密度与流量均值的对比来评价子模型仿真的精度。结果表明,多分辨率模型能够保持较高的一致性,弥补了单粒度仿真模型的不足,更贴合城市快速路的实际运行状况。

The conventional model is not adapted to urban expressway because of its intensive ramps, complex traffic operation situation and other characteristics. Based on Meta - synthesis methodology, set theory and other theories, a multi - resolution traffic model and its sub - models, which includes macroscopic simulation model, meso- seopic simulation model, and microscopic simulation model, can describe the actual operational status of urban expressway completely. And simulation models are implemented by C ＋ ＋. Finally, traffic multi - resolution model and its sub - models are evaluated by simulation scenarios of the North - South Elevated road in Shanghai. The results show that multi - resolution model and its sub - models can maintain high consistency and the multi - resolution model improves the deficiencies of single resolution models, which is fit for the actual operating conditions of urban expressway more.