城市互通立交的选型与设计

根据城市互通立交设置空间有限、功能要求高、选型及规模对城市交通影响重大的特点,着重对城市互通立交选型与设计的要点进行了探讨,并结合合肥市二环路—徽州大道枢纽立交论述了城市互通立交的选型与设计,可为国内其他类似五路交叉口改造为互通立交提供借鉴参考。     

轨道交通车辆选型要素分析

车辆选型所涉及的技术因素很多,相互之间既关联又制约,最终的选型成果是各项因素总体协调平衡的结果。通过对车辆选型的研究,对选型过程中所反映的具体问题进行分析,提出一些认识和建议,供设计参考。     

高速公路分离式立交设计

论述了在高速公路分离式立交设计中,应该遵循的设计原则和标准,并就设计中关于结构选型和接线问题进行了阐述.     

球型补偿器的应用及设计

介绍了球球补偿器的特点及基本结构。在简介其工程原理之后，给出了设计方法及选型原则。     

高速公路全程监控系统太阳能供电的设计

针对高速公路全程监控系统,通过与传统供电方式对比,提出高速公路全程监控系统采用太阳能供电的重要性和优越性。重点介绍太阳能供电系统主要部件的设计、选型要点,同时提出了相关选型参数的计算思路和方法,以及利用太阳能系统供电时应当考虑的若干问题。     

济南市济洛路—北园路立交设计布局与选型

简要介绍了立交设计布局与选型原则，立交平纵线型优化设计概况、立交桥梁结构的型式选择原则及立交所采用的结构型式情况，并介绍了立交所采用的经济技术指标等。     

利用数据库技术实现燃气调压器的自动选型

介绍了应用ADO数据库操纵技术 ,选用ACCESS桌面型数据库及VC 语言实现燃气调压器的自动选型技术 ,列举了选型实例 ,对选型设计进行了优化。通过应用该设计 ,缩短了产品开发周期 ,提高了生产效率     

先导式安全阀在输气站场中的选型应用

先导式安全阀因具有开启迅速、回座稳定并且密封性能好等优点,现已广泛应用于各输气站场中。因而,在输气站场中正确选择先导式安全阀至关重要。为了给输气站场中安全阀的设计选型提供参考,文中介绍了先导式安全阀的优点、结构特点、工作原理及选型步骤,并以某输气站场中先导式安全阀的实际计算选型为例,通过逐步分解计算,得出安全阀通道面积,并最终选择合适型号的先导式安全阀。     

冷冻液化石油气码头卸船工艺设计要点

对冷冻液化石油气卸船至水封洞库时的卸船工艺设计要点进行总结,主要阐述了装卸设备选型、管道选型、管道预冷和管道增压等。     

浅谈模数式桥梁伸缩装置的选型及改进

在桥梁设计中,桥梁伸缩装置的选型是否得当对桥梁运营影响很大。文章分析了几种典型结构的模数式伸缩装置的优缺点和适应性,提出了模数式伸缩装置选型应注意的几个问题,以及对现有模数式伸缩装置进行细部改进的思路。     

对城市轨道交通建设项目全过程投资控制必要性的认识

针对近年来城市轨道交通建设项目投资控制方面存在的问题，介绍了如何在轨道交通建设项目设计咨询、设计和施工阶段实施全过程投资控制的主要内容，强调了对轨道交通建设项目实行全过程投资控制的必要性，并提出了工程设计咨询、监理、审价等项目控制环节无法取代全过程投资控制的观点。     

门禁系统在轨道交通中的应用

门禁系统作为轨道交通重要的安防管理系统正逐步得到重视和推广应用。以上海市轨道交通10号线工程为例，从门禁系统构成、功能、工作模式等方面，重点介绍了该系统在轨道交通中的应用，并详述了门禁系统控制中心、车站和现场三级管理。     

轨道综合监控系统SIL评估中的风险管理

安全完整性等级SIL评估已经成为目前地铁安全系统工程的重要部分,也是国内外高度重视和着手研发的重要课题。风险管理是安全完整性评估中的重要环节,文中阐述了轨道交通综合监控系统中风险管理的要点和过程,包括风险分析范围、风险源识别、风险分析、风险评估、风险缓解与控制、风险跟踪与关闭,重点阐述了风险分析和风险评估的方法,为其他安全相关系统的开发和安全评估提供了参考。     

Energy-efficient operation of rail vehicles

This paper describes an analytical process that computes the optimal operating successions of a rail vehicle to minimize energy consumption. Rising energy prices and environmental concerns have made energy conservation a high priority for transportation operations. The cost of energy consumption makes up a large portion of the Operation and Maintenance (O&M) costs of transit especially rail transit systems. Energy conservation or reduction in energy cost may be one of the effective ways to reduce transit operating cost, therefore improve the efficiency of transit operations.From a theoretical point of view, the problem of energy efficient train control can be formulated as one of the functions of Optimal Control Theory. However, the classic numerical optimization methods such as discrete method of optimum programming are too slow to be used in an on-board computer even with the much improved computation power, today. The contribution of this particular research is the analytical solution that gives the sequence of optimal controls and equations to find the control change points. As a result, a calculation algorithm and a computer program for energy efficient train control has been developed. This program is also capable of developing energy efficient operating schedules by optimizing distributions of running time for an entire route or any part of rail systems.We see the major application of the proposed algorithms in fully or partially automated Train Control Systems. The modern train control systems, often referred as “positive” train control (PTC), have collected a large amount of information to ensure safety of train operations. The same data can be utilized to compute the optimum controls on-board to minimize energy consumption based on the algorithms proposed in this paper. Most of the input data, such as track plan, track profile, traction and braking characteristics, speed limits and required trip time are located in an on-board database and/or they can be transmitted via radio link to be processed by the proposed algorithm and program.     

Rail network accessibility and the demand for inter-urban rail travel

This paper reviews methods that have and can be used to forecast the effect of changes in accessibility to the rail network on the demand for inter-urban rail travel and of available evidence on rail accessibility elasticities. It reveals that relatively little research has been conducted in this area and that the forecasting procedures that could be used imply large variation in accessibility elasticities, which has not been empirically justified. Fresh empirical evidence on two related matters is reported. First, the neglected area of choice set composition is examined and the extent to which rail is considered to be a realistic alternative for inter-urban journeys and the contribution that accessibility to the rail network makes to this are analysed. Second, rail trip rate models are presented that not only contain estimates of accessibility elasticities and of the effects of a range of socio-economic variables on the demand for rail travel, but also that allow tests of the accessibility elasticity variation implied by many forecasting procedures to be conducted. It is found that this elasticity variation is not empirically supported. It is concluded that there is only limited scope for increasing rail demand through improvements in rail network accessibility.     

客运专线长轨精调经验与体会

我国客运专线建设进入了一个新的时期,高速、平顺的无砟轨道是发展趋势。其中长轨铺设后的精调工作是保证列车高速运行的最关键工作。文章结合武广客运专线的实际,阐述长轨精调整过程的经验及施工过程中的主要质量控制要点。     

Rail line length in a crosstown corridor with many-to-many demand

An analytical model that determines the optimal location and length of rail line along a crosstown transportation corridor with the objective of minimizing the total transportation cost is presented. A general, many-to-many passenger demand pattern is considered. The objective function, which includes the rail and bus riding costs, rail and bus operating costs, rail fleet costs and rail line costs, is minimized by using the classical optimization method with the aid of a computer program developed for the model. The model is applied to the Northwest-South transportation corridor in Calgary, Alberta, and the sensitivity of the optimal rail line location and length to the unit cost and demand parameters at their reasonable ranges is tested. It is found that although the total passenger demand, unit rail line cost, and unit bus operating cost have greater influence than the unit bus and rail riding costs, and unit rail fleet and operating costs, the optimal line length is generally insensitive to all these parameters. It is also found that the length of the existing LRT line in the corridor is comparable to the optimal line length obtained from the model, but the existing line should be extended further south in order to meet the heavier demand in that direction optimally.     

上海轨道交通地下车站施工风险及其应对措施的研究

围绕轨道交通地下车站的施工工序,对地下车站的施工风险进行了分析,并有针对性地提出了一些风险控制措施。通过研究其中潜在的风险发生机理,将有助于建立轨道交通建设风险控制体系,减少并控制轨道交通地下车站施工中的风险事故。     

关于城市轨道交通工程水文地质勘察工作的探讨

结合轨道交通岩土工程勘察的特点,对当前水文地质勘察的外业与室内试验工作进行了分析与探讨,并对轨道交通工程中水文地质条件分析与评价进行了阐述,阐明了该项工作在轨道交通工程中的重要性与必要性,以供同行参考.     

轨道交通ATS仿真运行框架的设计与实现

在分析轨道交通ATS系统特性的基础上,选用面向对象的仿真建模框架和逻辑控制框架,结合城市轨道交通的运行特点,对ATS仿真系统的时间控制和对象控制进行明确定义,克服传统仿真控制逻辑发散于描述模型过程代码中的缺点,介绍了一种面向对象的ATS仿真系统运行框架的设计和实现方法,为ATS仿真系统提供新的思路和方案。