无缝线路现场移动式气压焊接质量的控制

长钢轨焊接是铺设无缝线路的一个极其特殊和重要的过程,原因在于其内部质量的好坏不能通过后续检验来判定,直接危及运输行车安全;其几何外形尺寸的平顺是保证无缝线路正常运用的关键。钢轨焊接质量不良,将使线路维修工作后患无穷,因此有效控制钢轨焊接质量成为目前急需探讨和解决的新课题。     

城铁合成长枕埋入式无碴道床道岔施工技术

以广州地铁四号线引进的国际领先水平的新型轨枕材料——合成轨枕为研究对象,结合四号线的工程实际,介绍了在国内首次铺设合成岔枕整体道床道岔的施工技术。     

基于轨间电缆的城市轨道列车速度控制系统

分析了基于轨间电缆的城市轨道列车速度控制系统结构及设计要求，通过对系统的基本原理的论述，提出了一种较为适合我国城市轨道交通发展的速度控制方式。     

城轨交通信号系统资源共享与互联互通

实现城市轨道交通信号系统资源共享的基本形式有技术共享、操作界面和方式的共享、检修设备共享、人力资源共享、维修工艺共享、仿真培训设备资源共享等;信号系统互联互通的基本条件是:信号制式相同,系统结构和功能划分一致,地车信息传输系统兼容,列车定位技术兼容或统一,ATP安全控制方式统一设计和要求,列车驾驶模式和操作方式统一,信号与车辆接口相同,信号与PIS系统合理分配频道和接口;实现信号系统互联互通的基本手段有:采用同一厂商相同制式的信号系统,加装多套信号车载设备和地面设备.采用通用的信号车载设备,实现规范和标准的信号互联互通等.概括介绍国外轨道交通资源共享与互联互通的研究发展情况.     

昆明轨道交通岩溶专项勘察手段及方法

为解决传统勘察手段及方法很难查明岩溶发育特征的难题,以昆明轨道交通4 号线岩溶专项勘察为案例工程,介绍在岩土工程初步勘察、详细勘察的基础上,采用以工程地质钻探及现场物探测试(孔间层析成像(CT)、高密度电法、地质雷达)为主,并结合工程地质测绘、原位测试、钻孔抽水试验和室内土工试验等综合勘察技术手段和方法,查明了线路沿线的岩溶分布、规模及形态等发育特征,并对其做出定量或定性评价,为岩溶专项治理施工图设计、优化设计方案及完善施工组织设计等提供了可靠的地质依据,对类似工程具有一定的指导及参考作用。     

南京城市公共交通一卡通行应用方案研究

用模糊评价方法对南京地铁与公交一卡通行方案进行优选。分析了南京公交IC卡系统现状和地铁AFC系统选型,表明公交IC卡系统不适应技术发展趋势以及多应用的拓展,而地铁AFC系统则充分考虑了这些需求。讨论了地铁、公交一卡通行各种可能的模式及其影响因素,利用加权最小隶属度偏差模型对南京城市公共交通一卡通行应用方案进行评价,评价结果与模糊综合评判加权平均模型相一致,表明一步到位方案为最佳方案,但加权最小隶属度偏差法反映了不同方案偏离理想方案的程度。     

山地旅游轨道交通线路规划的适应性评价

山地景区地势复杂,其发展普遍受交通所限,为了提高山地景区的运营效益、带动经济发展,国内部分景区规划和修建了山地旅游轨道交通。本文列举了山地旅游轨道交通特征及线路规划模式,从地理环境、自然环境、供需环境及与常规公交的关系四个角度分析,对应建立四个子系统,并选取具有山地旅游轨道交通特性的评价指标体系,利用层次分析法和变异系数法组合赋权重,运用灰色关联分析法的评价模型,据此判断线路规划方案适应性的优劣。     

Design and development of interactive trip planning for web-based transit information systems

This article presents a Web-based transit information system design that uses Internet Geographic Information Systems (GIS) technologies to integrate Web serving, GIS processing, network analysis and database management. A path finding algorithm for transit network is proposed to handle the special characteristics of transit networks, e.g., time-dependent services, common bus lines on the same street, and non-symmetric routing with respect to an origin/destination pair. The algorithm takes into account the overall level of services and service schedule on a route to determine the shortest path and transfer points. A framework is created to categorize the development of transit information systems on the basis of content and functionality, from simple static schedule display to more sophisticated real time transit information systems. A unique feature of the reported Web-based transit information system is the Internet-GIS based system with an interactive map interface. This enables the user to interact with information on transit routes, schedules, and trip itinerary planning. Some map rendering, querying, and network analysis functions are also provided.     

Environmental life-cycle assessment of transit buses with alternative fuel technology

The paper presents a life-cycle assessment of costs and greenhouse gas emissions for transit buses deploying a hybrid input-output model to compare ultra-low sulfur diesel to hybrid diesel-electric, compressed natural gas, and hydrogen fuel-cell. We estimate the costs of emissions reductions from alternative fuel vehicles over the life cycle and examine the sensitivity of the results to changes in fuel prices, passenger demand, and to technological characteristics influencing performance and emissions. We find that the alternative fuel buses reduce operating costs and emissions, but increase life-cycle costs. The infrastructure requirement to deploy and operate alternative fuel buses is critical in the comparison of life-cycle emissions. Additionally, efficient bus choice is sensitive to passenger demand, but only moderately sensitive to technological characteristics, and that the relative efficiency of compressed natural gas buses is more sensitive to changes in fuel prices than that of the other bus types.     

Estimation of rail passenger flow and system utilization with ticket transaction and gate data

Capturing the dynamics in passenger flow and system utilization over time and space is extremely important for railway operators. Previous studies usually estimated passenger flow using automatic fare collection data, and their applications are limited to a single stopping pattern and/or a single type of ticket. However, the conventional railway in Taiwan provides four types of ticket and five types of train service with a number of stopping patterns. This study develops a comprehensive framework and corresponding algorithms to map passenger flow and evaluate system utilization. A multinomial logit model is constructed and incorporated in the algorithms to estimate passenger train selection behavior. Results from the empirical studies demonstrate that the developed framework and algorithms can successfully match passengers with train services. With this tool, operators can efficiently examine passenger flow and service utilization, thereby quickly adjusting their service strategies accordingly to improve system performance.