Strategic assessment of capacity consumption in railway networks: Framework and model

In this paper, we develop a new framework for strategic planning purposes to calculate railway infrastructure occupation and capacity consumption in networks, independent of a timetable. Furthermore, a model implementing the framework is presented. In this model different train sequences are generated and assessed to obtain timetable independence. A stochastic simulation of delays is used to obtain the capacity consumption. The model is tested on a case network where four different infrastructure scenarios are considered. Both infrastructure occupation and capacity consumption results are obtained efficiently with little input. The case illustrates the model’s ability to quantify the capacity gain from infrastructure scenario to infrastructure scenario which can be used to increase the number of trains or improve the robustness of the system.     

转向架构架强度试验标准对比

从试验内容、试验载荷、试验工况组合和试验结果评定等方面对比了UIC、EN和JIS关于转向架构架强度试验的标准,并针对我国进行转向架构架强度试验给出了一些建议。     

一种步进电机驱动器的设计

文中驱动器具有电位器接口,只要用户旋转电位器,就可以准确的调节电机转速;此外驱动器还具有RS-232控制接口,软件开发人员可以很轻松地完成对电机的控制.     

新型保温材料——橡塑海绵在海洋石油平台及FPSO上的应用

橡塑海绵保温材料在CFD11项目中首次应用于海洋石油管线和设备保温领域。比较了橡塑海绵与海洋石油平台及FPSO上应用的传统保温材料的性能，探讨了其在海洋石油行业上应用的可行性。     

Sensitivity analysis to assess the influence of the inertial properties of railway vehicle bodies on the vehicle's dynamic behaviour

A sensitivity analysis has been performed to assess the influence of the inertial properties of railway vehicles on their dynamic behaviour. To do this, 216 dynamic simulations were performed modifying, one at a time, the masses, moments of inertia and heights of the centre of gravity of the carbody, the bogie and the wheelset. Three values were assigned to each parameter, corresponding to the percentiles 10, 50 and 90 of a data set stored in a database of railway vehicles. After processing the results of these simulations, the analysed parameters were sorted by increasing influence. It was also found which of these parameters could be estimated with a lesser degree of accuracy for future simulations without appreciably affecting the simulation results. In general terms, it was concluded that the most sensitive inertial properties are the mass and the vertical moment of inertia, and the least sensitive ones the longitudinal and lateral moments of inertia.     

Influence of the track quality and of the properties of the wheel–rail rolling contact on vehicle dynamics

This work describes an analytical approach to determine what degree of accuracy is required in the definition of the rail vehicle models used for dynamic simulations. This way it would be possible to know in advance how the results of simulations may be altered due to the existence of errors in the creation of rolling stock models, whilst also identifying their critical parameters. This would make it possible to maximise the time available to enhance dynamic analysis and focus efforts on factors that are strictly necessary. In particular, the parameters related both to the track quality and to the rolling contact were considered in this study. With this aim, a sensitivity analysis was performed to assess their influence on the vehicle dynamic behaviour. To do this, 72 dynamic simulations were performed modifying, one at a time, the track quality, the wheel–rail friction coefficient and the equivalent conicity of both new and worn wheels. Three values were assigned to each parameter, and two wear states were considered for each type of wheel, one for new wheels and another one for reprofiled wheels. After processing the results of these simulations, it was concluded that all the parameters considered show very high influence, though the friction coefficient shows the highest influence. Therefore, it is recommended to undertake any future simulation job with measured track geometry and track irregularities, measured wheel profiles and normative values of the wheel–rail friction coefficient.     

UIC标准限界及相关问题计算研究

研究目的:国际铁路联盟(UIC)主要制订适用于其所有成员国的通用性、基础性或涉及多个专业间接口的国际标准,主要包含产品标准及过轨标准,而UIC限界标准就是通用性的过轨标准,其理解显得尤为重要.UIC限界标准最重要的部分就是关于动态限界的基准轮廓线的理解,国铁规范没有相对应的概念.本文的研究对于正确理解UIC规范有一定的...     

国际铁路联盟(UIC)标准化现状研究及合作建议

随着中国铁路走向世界,铁路标准国际化也成为必然趋势。国际铁路联盟(UIC)作为中国铁路长期合作的、具有一定国际影响力的国际组织,发布铁路相关的国际标准(IRS)。通过研究UIC标准化现状,阐述IRS与其他相关标准的关系,分析目前UIC标准化面对的重量不重质、站位不够高等7类主要问题,解读《UIC铁路标准化战略》中提出的重新设计UIC标准制定流程、标准化组织形式的优化解决方案,最终提出中国铁路进一步参与UIC国际标准编制的合作建议,主要包括积极承担UIC标准编制、提供经济高效的优质标准和学习借鉴。     

国际铁路联盟规程UIC777-2及应用概述

当前,如何考虑列车脱轨撞击结构的作用是我国高速铁路站房设计中亟待解决的问题之一。国际铁路联盟标准方面出版物UIC规程,在国际上具有重要地位,欧洲规范中与铁路有关的条款制定,UIC规程是重要依据之一;我国也把UIC规程作为铁道行业标准的重点采纳标准。规程UIC777-2针对跨铁路线结构提出了在轨道区的设计要求,目标是提出合理的、可操作的方法来尽可能减少由于列车脱轨撞击跨线结构及邻线结构而引起的危害。就欧洲规范UIC777-2中的结构设计策略、设计方法及预防保护措施在欧洲的实际应用情况进行介绍,目的是适当吸取国际铁路联盟的有益经验,为进一步提出适用于我国高速铁路站房抵御高速列车脱轨撞击的设计方法奠定基础。     

国际铁路联盟与标准化组织的合作及在国际铁路技术体系中的作用

通过分析国际铁路联盟与标准化组织之间的合作,了解国际铁路联盟技术的发展走向。主要分析国际铁路联盟与欧洲标准化组织/欧洲电工标准化委员会、国际标准化组织的技术合作,及在国际铁路技术体系中发挥的重要作用。