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首页> 外文期刊>Urban Rail Transit >Open-Source Public Transportation Mobility Simulation Engine DTALite-S: A Discretized Space–Time Network-Based Modeling Framework for Bridging Multi-agent Simulation and Optimization
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Open-Source Public Transportation Mobility Simulation Engine DTALite-S: A Discretized Space–Time Network-Based Modeling Framework for Bridging Multi-agent Simulation and Optimization

机译：开源公共交通流动性仿真引擎DTALite-S：基于离散时空网络的桥接多主体仿真和优化的建模框架

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摘要

Recently, an open-source light-weight dynamic traffic assignment (DTA) package, namely DTALite, has been developed to allow a rapid utilization of advanced dynamic traffic analysis capabilities. Aiming to bridge the modeling gaps between multi-agent simulation and optimization in a multimodal environment, we further design and develop DTALite-S to simplify the traffic flow dynamic representation details in DTALite for future extensions. We hope to offer a unified modeling framework with inherently consistent space–time network representations for both optimization formulation and simulation process. This paper includes three major modeling components: (1) mathematic formulations to describe traffic and public transportation simulation problem on a space–time network; (2) transportation transition dynamics involving multiple agents in the optimization process; (3) an alternating direction method of multipliers?(ADMM)-based modeling structure to link different features between multi-agent simulation and optimization used in transportation. This unified framework can be embedded in a Lagrangian relaxation method and a time-oriented sequential simulation procedure to handle many general applications.?We carried out a case study by using this unified framework to simulate the? passenger traveling process in?Beijing subway network which contains 18 urban rail transit lines, 343 stations, and 52 transfer stations.?Via the?ADMM-based solution approach, queue lengths at platforms, in-vehicle congestion levels and absolute deviation of travel times are obtained within 1560 seconds.The case study?indicate that the open-source DTALite-S integrates simulation and optimization procedure for complex dynamic transportation systems and can efficiently generate comprehensive space-time traveling status.
机译：最近，开发了一种开源轻量级动态流量分配（DTA）软件包，即DTALite，以允许快速利用高级动态流量分析功能。为了弥合多模式环境中多主体仿真与优化之间的建模差距，我们进一步设计和开发了DTALite-S，以简化DTALite中的交通流动态表示细节，以供将来扩展。我们希望为优化制定和仿真过程提供一个具有固有一致性的时空网络表示形式的统一建模框架。本文包括三个主要的建模组件：（1）描述时空网络上交通和公共交通模拟问题的数学公式; （2）在优化过程中涉及多个代理的运输过渡动力学; （3）基于乘数（ADMM）的交替方向建模结构，将多智能体仿真和运输中使用的优化之间的不同特征联系起来。该统一框架可以嵌入到Lagrangian松弛方法和面向时间的顺序仿真过程中，以处理许多一般应用。我们通过使用该统一框架对案例进行了案例研究。北京地铁网络中的乘客旅行过程，该地铁网络包含18条城市轨道交通线路，343个车站和52个换乘站。案例研究表明，开源DTALite-S集成了复杂动态运输系统的仿真和优化过程，可以有效地生成综合的时空旅行状态。

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