单线铁路会让站到发线数量的研究

考虑到单线铁路列车实际运行中产生交会和越行方式的随机性 ,采用概率分析的方法 ,通过研究在不同开行条件下 ,产生交会、越行次数和方式的各种情况 ,建立车站到发线设置数量与交会、越行次数和方式之间的关系 ,找到直接影响车站到发线数量的主要因素 ,得出了影响其变化的一般规律。并运用研究成果对渝怀线进行了分析和验证     

空车调整最小费用的合理分摊

借助多人合作对策的思想建立了铁路空车调整问题中最小费用合理分摊的数学模型，给出了建立理想分摊向量和特征函数的一种方法，并提供了具体解法，比较有效地解决了空车调整中最小费用的合理分摊问题，为最优调运方案的实际实施提供了前提和保障。     

Robust control and actuator dynamics compensation for railway vehicles

A robust controller is designed for active steering of a high speed train bogie with solid axle wheel sets to reduce track irregularity effects on the vehicle’s dynamics and improve stability and curving performance. A half-car railway vehicle model with seven degrees of freedom equipped with practical accelerometers and angular velocity sensors is considered for the H_∞ control design. The controller is robust against the wheel/rail contact parameter variations. Field measurement data are used as the track irregularities in simulations. The control force is applied to the vehicle model via ball-screw electromechanical actuators. To compensate the actuator dynamics, the time delay is identified online and is used in a second-order polynomial extrapolation carried out to predict and modify the control command to the actuator. The performance of the proposed controller and actuator dynamics compensation technique are examined on a one-car railway vehicle model with realistic structural parameters and nonlinear wheel and rail profiles. The results showed that for the case of nonlinear wheel and rail profiles significant improvements in the active control performance can be achieved using the proposed compensation technique.     

电气化集装箱堆场附属设施施工

为保护环境,集装箱堆场的传统起吊机械——轮胎式龙门吊正寻求新能源以替代原有柴油动力。＂油改电＂的方式较为经济。文章阐述了在有限的场区内,如何合理地安排用于电缆走向及转向的附属设施的施工,是电气化集装箱堆场施工中的重要环节。     

客专及高速铁路后张法预应力混凝土箱梁预制场规划综述

客专及高速铁路箱梁预制场具有建设标准高、技术难度大、投入高、建厂工期紧等特点。结合京津、武广、京沪、哈大等线部分梁场现象,分别从投资、适用范围及制梁施工组织方面阐述梁场选址及规划,并提出相应建议。选址及规划问题是建设一个投资节约、规划合理的高标准梁场的先决条件,并对后续的制梁施工组织及施工效率产生影响。     

交流电气化铁路AT供电牵引网电气分析

为深入了解交流电气化铁路AT(自耦变压器)供电网络,明确物理概念,利用基于两相对称分量变换的 复合序网分析法,给出了牵引网、自耦变压器、牵引变压器、牵引负荷和电源等网络元件的序模型及AT 供电网 络复合序网的建立方法;定义了供电能力及其利用率,通过比较2X27.5kV AT供电模式与55kV AT供电模 式的特点和性能,说明了供电能力与负荷供电容量需求之间匹配的重要性.仿真结果表明,基于两相对称分量变 换的AT网络复合序网分析方法具有简单可行、物理概念清晰等特点.      

车载探地雷达在新建铁路路基质量普查中的应用

简要介绍了车载探地雷达原理、系统及在新建铁路路基质量普查中的应用情况。车载探地雷达,可迅速了解全线路基基床的状况和道床厚度等有关信息,以及探测桥涵两端与一般路基工后沉降等基床病害。经实地挖探验证与现场实际情况较为吻合。车载探地雷达,能够快速、准确、真实地检测路基的质量状况。     

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与发达国家不同,我国正处于快速城镇化发展阶段,迫切需要在运输需求预测理论与方法上的创新.为了更科学地进行运输需求预测工作,从而对运输需求有系统精准的把握,基于"运输系统是一类开放的复杂巨系统"及"运输需求预测是一类复杂性问题"的认知,将系统工程中"从定性到定量"的综合集成方法论引入运输需求预测之中,提出基于综合集成方法论的运输需求预测方法,并给出具体执行操作流程.以浙江省城际轨道交通客流预测为例,将研究成果应用于实际的工程项目之中,验证了其有效性.实践结果表明,"从定性到定量"、"人机结合,以人为主"的运输需求预测综合集成方法能够较好地保证预测结论的准度和精度,同时也具有较强的可操作性.     

铁路电气化改造对军专线油库安全的影响

铁路的电气化改造在带来运输效益的同时,由于其高压、强电磁辐射的特点也给电气化铁路附近的军用油仓库带来了巨大的危险隐患。分别从军专线电气化、正线电气化、军专线长度及位置、大地导电率、钢轨对地电位差六方面分析了电气化对油库安全的影响。为做好油库电气化工程防护提供依据。     

Role of the Railways in the Future of Air Transport

Abstract

The role of the railways in the air transport industry is usually limited to provision of access to airports. However, the development of high-speed rail networks and the congestion and environmental problems faced by the air transport industry suggest the railways could have a greater role in working with the airlines to provide an integrated transport service for medium-distance journeys (up to 800 km). Many air journeys involve two flights and a transfer at a hub airport. The alternative being investigated here would replace air journeys by a rail journey and a flight, and a transfer between them at the hub airport. Such integration could offer a positive alternative to aircraft on some routes and lead to railway journeys to airports becoming part of air transport services, and not only to provide access to them. Integration could therefore provide a better use of available air capacity rather than duplicating some high-speed rail routes and services.