Analysis of real-time control strategies in a corridor with multiple bus services

Control strategies have been widely used in the literature to counteract the effects of bus bunching in passenger‘s waiting times and its variability. These strategies have only been studied for the case of a single bus line in a corridor. However, in many real cases this assumption does not hold. Indeed, there are many transit corridors with multiple bus lines interacting, and this interaction affects the efficiency of the implemented control mechanism.This work develops an optimization model capable of executing a control scheme based on holding strategy for a corridor with multiple bus lines.We analyzed the benefits in the level of service of the public transport system when considering a central operator who wants to maximize the level of service for users of all the bus lines, versus scenarios where each bus line operates independently. A simulation was carried out considering two medium frequency bus lines that serve a set of stops and where these two bus lines coexist in a given subset of stops. In the simulation we compared the existence of a central operator, using the optimization model we developed, against the independent operation of each line.In the simulations the central operator showed a greater reduction in the overall waiting time of the passengers of 55% compared to a no control scenario. It also provided a balanced load of the buses along the corridor, and a lower variability of the bus headways in the subset of stops where the lines coexist, thus obtaining better reliability for all types of passengers present in the public transport system.     

列车通信网络简介

列车通信网络的性能直接影响列车的整体性能,它由连接一辆车上各种设备的多功能车辆总线和连接列车中各车辆总线的列车总线组成。分别介绍了它们的技术特点和结构,以及在轨道车辆上的应用情况。     

客车玻璃钢前后围开发

针对客车车身的生产特点及需求,从材料、结构、工艺方面全面阐述某客车玻璃钢前后围开发,分析玻璃钢材料、整体式玻璃钢前后围工艺在客车车身开发上的应用优势。     

Bus rapid transit operation analysis using the Downs–Thomson paradox

The purpose of the paper is to analyze effectiveness before and after implementation of the bus rapid transit operation. The paper includes a speed analysis based on the Downs–Thomson paradox, and a reliability analysis based on variance analysis of arrival time. According to the speed analysis, some road sections are now under phase 2 in the Downs–Thomson paradox, which is a state in which the bus speeds are greater than the auto speeds. In the future, it is predicted that autos and buses will reach an equilibrium speed which is in phase 3 of the multi‐modal equilibrium theory. According to the reliability analysis of arrival time at each bus stop, in roads of median arterial bus lanes, the variance of arrival time is generally smaller than after the scheme implemented in 8 months later. Copyright © 2010 John Wiley & Sons, Ltd.     

增强执行力,落实"公交优先"战略

论述了落实公交优先战略的诸多方面:制定城市规划;更新观念,明确畅通工程的重中之重是公交畅通,大城市中心区的小汽车不应是上下班交通工具,而是休闲工具;降低城市轨道交通工程造价,在城市轨道交通市域线的郊区段采用公交型普通铁路制式,大力发展快速道路公交系统(BRT);立章建制,为公交优先提供制度保障。     

基于母线差动保护的城市轨道交通中压环网保护方案研究

阐述了目前城市轨道交通供电系统中压环网大分区保护方案技术现状,对目前大分区保护方案的技术难点进行了分析,在此基础上提出基于母线差动保护的中压环网保护方案。该方案以设置近后备保护为出发点,实现了各种运行方式下的保护完全选择性,具有很高的独立性和可靠性,很好地解决了目前供电系统设计中的技术难题。     

地铁列车安全运行的远程诊断技术

为有效地监测地铁列车运行状态,实现实时准确诊断,需要研究和探索地铁列车运行状态信息的远程智能采集、传输及分析诊断的方法和技术,建立地铁列车运行故障处理远程智能诊断服务技术体系。介绍了一种基于MVB(多功能车辆总线)的地铁列车远程诊断技术,包含车载接入子系统、车地通信子系统和地面综合应用子系统,实现远程实时诊断,更好地保障地铁列车安全运营。     

城市公交线路运力配置合理性研究

在城市公交运力调控必要性分析的基础上,对公交线路运力资源合理配置的含义进行界定,并提出其目标和实现原则,可得到公交线路运力合理配置的理论框架,对于相关研究具有参考价值。     

高铁车站接驳公交灵活线路优化设计研究

目前高铁车站接驳公交仅服务离开高铁站的乘客,在回高铁车站时空车驶回造成极大的资源浪费. 本文设计了一种考虑回程的服务去往,以及离开高铁车站乘客的接驳公交服务模式,即“高铁快巴”灵活线路,区别于常规模式的固定线路,根据乘客预先提交的出行需求生成灵活型“伞状”线路,以车辆行驶时间最少为目标,通过站点拆分,构建灵活线路优化设计模型,运用IBM ILOG CPLEX进行求解,通过案例验证了模型的有效性,在合理的时间内求解出车辆的行驶路径. 当根据乘客提交的需求设计出车辆行驶路由后,系统会将车辆到站时间发送给乘客,乘客根据到站时间出行,方便了乘客的出行.     

串联式混合动力客车制动能量回收的研究

制动能量回收是提高串联式混合动力客车经济性的重要手段.通过理论分析,对中国典型城市公交工况和不同城市实测公交工况的可用制动能量进行了计算和比较.在此基础上提出了串联式混合动力客车适用的制动能量回收策略,并通过前向式仿真模型对此策略进行仿真.最后通过实车运行验证了此制动能量回收策略的可行性和有效性.