Exact train pathing

Suppose we are given a schedule of train movements over a rail network into which a new train is to be included. The origin and the destination are specified for the new train; it is required that a schedule (including the path) be determined for it so as to minimize the time taken without affecting the schedules for the old trains. In the standard formulations of this single train pathing problem, the time taken by the train to traverse any block (track segment guarded by a signal) in the network is deemed to be a fixed number, independent of how the train arrived onto that block. In other words, the standard formulations of train pathing do not accurately model the acceleration/deceleration restrictions on trains. In this paper we give an algorithm to solve the single train pathing problem, while taking into account the maximum allowed acceleration and deceleration as well as explicitly modeling signals. For trains having ‘large’ maximum acceleration and deceleration, our algorithm runs in polynomial time. On the other hand, if the train to be pathed is capable of only very small acceleration so that it must take a long time to reach full speed, our algorithm takes exponential time. However, we prove that the pathing problem is NP-complete for small acceleration values, thus justifying the time required by our algorithm. Our algorithm can be used as a subroutine in a heuristic for multiple train pathing. If all trains have large (but possibly different) accelerations this algorithm will run in polynomial time. V. Nagarajan is supported in part by NSF grant CCF-0728841.     

列车车次信息语音查询系统的开发设计

开发设计的列车车次信息语音查询系统是一个基于PSTN网络的交互式自动语音应答服务系统,其主要作用是为用户通过手机、固定电话查询车次信息提供自动的语音应答服务。介绍了该系统的主要设计方法,包括建立连接电话网的CTI服务器、系统平台、后台数据库和语音文件库。系统平台的设计使用界面操作性好的C＋＋Builder软件,后台数据库使用Access数据库建立。应用计算机电话集成（CTI）技术和自动语音应答（IVR）技术,构建的车次信息查询系统提供了与电话网的接入功能,为用户服务的自动语音引导、查询功能,还为管理人员建立了友好的前台列车车次信息管理平台。     

Silo quaking of iron ore train load out bin – A time-varying mass structural dynamic problem

Expanded flow bins are commonly used in the material handling industry to store and load train wagons. These bins are known in the industry as Train Load Out (TLO) bins. Several iron ore TLO bins have been designed and constructed to accommodate this demand. It has been reported that some iron ore TLO bins suffer a dynamic condition during discharge known as silo quaking. The quake causes several problems, which could lead to structural connections failure, reduced fatigue life of structural connections, computer data corruption, on-site personnel discomfort, loss of production, and increase in maintenance costs. However, the author had structurally designed a 2500 tonne iron ore TLO and prevented silo quaking by providing sufficient stiffness, damping and mass to counterbalance the pulsating loads and mass losses produced by the flowing iron ore. In this paper, a numerical model incorporating time-varying mass will be presented to explain the dynamics of Iron Ore TLO Bin. The model is validated by experimental results obtained from a 1 in 10 scaled model. The proposed numerical model supports the theory that pulsation loads occur in almost all bins and whether the induced dynamic loads cause any quaking problems are dependent on the severity of the loads, natural frequencies of the bin and its supporting structure.     

浅谈GSM-R系统调度命令传送的工作流程

随着中国铁路的跨越式发展,高速铁路和客运专线的大规模修建,高铁时代正向我们走来,铁路无线通信GSM-R作为铁路专用通信的发展方向,逐步取代着原有模拟制式的通信方式。GSM-R是在GSM公众移动通信系统平台上增加了铁路运输专用调度通信功能,充分发挥数据通信的优势,在功能扩展、升级、场强覆盖等方面得到有效提升,通信质量得到可靠保障。     

地铁综合监控和信号系统接口实现

介绍了综合监控系统与地铁信号系统间的接口实现方式,车站通过TCP/IP链路外部连接完成信息传输,中心则通过系统消息总线机制完成信息交互,这种设计方式很好的满足了信号系统在综合监控平台中进行控制的要求,是城市轨道交通监控的又一创新.     

铁路局列车调度指挥中心容灾系统的设计与实现

针对铁路局列车调度指挥中心目前灾难备份的现状,提出了建立铁路局列车调度指挥中心异地容灾备份方案,给出了具体的设计并做出了详细的分析。铁路局列车调度指挥中心容灾系统的建立可进一步提高T D C S系统的安全性和可靠性。     

基于MVB＋CAN总线技术的城轨车门监控网络设计

多功能车辆总线（MVB）在列车通信网络系统中得到了广泛的应用,但由于MVB总线物理层的局限,每个网段最多只可连接32个设备,这限制了允许直接连接到MVB总线的车门数量.介绍了一种基于MVB＋CAN总线技术的城轨车门网络设计及具体实现方法,利用两个主门控器（MDCU）作为MVB转CAN的冗余网关,即解决了每个MVB网段连接设备数量局限问题、降低了系统成本,而且提高了车门网络系统的可用性.该设计已批量应用于多个城轨车门项目中,取得了较好的应用效果.     

列车荷载作用下渗漏隧道的长期非线性固结

为研究列车荷载对地铁周边土体长期非线性固结的影响,以及其与隧道渗漏的共同作用,将列车荷载等效为矩形循环荷载,采用经典的土体非线性固结理论,以及衬砌与土体相对渗透性系数,得出列车荷载作用下局部渗漏隧道的非线性固结解析解.通过本文预测值与上海地铁实测数据的对比,验证了解析解的合理性.分析结果表明:列车荷载加剧了隧道上方地表长期沉降,衬砌渗漏程度越大,沉降增加量越大.本文解析解能较好模拟隧道周边土体的长期固结特性,为预测地铁隧道长期运营导致的地表沉降提供一个较为合理有效的方法.     

列车节能操纵中最优方案的算法

本文在给出列车节能操纵关键方程的基础上，对优化型运行方案给出不同的算法，并对不同的算法进行比较。     

Non-Discriminatory Automatic Registration of Knock-On Train Delays

Incidents and waiting for train connections are registered by dispatchers as sources of train delays, but route and headway conflicts are not always clearly recognized. Moreover, traffic management and route setting are the primary task of dispatchers and signallers, whilst monitoring and incident registration is not allowed to take up too much of their time. This paper describes a tool that automatically and without discrimination identifies route conflicts and the train numbers involved. It is based on standard train describer and infrastructure messages recorded on the Dutch railway network. The logic of these messages is captured in a coloured Petri net (CPN) model on which a prototype tool for route conflict identification and estimation of knock-on delay has been developed.