《城市轨道交通研究》2000-2004年的载文分析

依据中国科学技术信息研究所研制的《中国科技论文与引文数据库(CSTPCD)》,选取《城市轨道交通研究》2000—2004年刊载的542篇论文作为统计对象,运用文献计量学的原理和方法对指标数据进行统计分析,还讨论了载文的地区分布、机构分布和合著情况等方面。分析结果表明主要指标保持增长;企业论文比例高;具有吸引境外论文的能力。     

两种港口起重机轨道固定系统的比较研究

轨道固定系统是起重机平稳安全运行的基础,文章从轨道的受力分析出发,比较说明有缝轨道鱼尾板硬式固定系统和无缝轨道柔性固定系统的优缺点。     

轨道交通牵引供电系统仿真中的算法研究

由于城市轨道交通直流供电系统建模后表现出非线性特性,对模型求解的仿真算法大都基于迭代技术。文章介绍了双重线性迭代和牛顿迭代两种算法,并从收敛效果和快速性两方面对它们进行了测试对比分析,同时通过改变电路结构模型和选用合适的迭代算法得到了理想的仿真效果。     

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。     

An integrated framework for assessing service efficiency and stability of rail transit systems

A well-designed service plan efficiently utilizes its infrastructure and ensures an acceptable level of service stability with consideration of potential incidents that disturb or disrupt the rail transit services. To perform service evaluation, an integrated process combining capacity, resource usage, and system reliability is required to quantify service efficiency and stability in a consistent way. This study adopts capacity-based indices, “capacity utilization” and “expected recovery time”, as the attributes for service efficiency and stability, and develops a comprehensive evaluation framework with three corresponding modules to incorporate capacity, service plan, and system reliability and maintainability simultaneously. The capacity analysis module computes the rail transit capacities under normal and degraded operations. The reliability module classifies and fits the proper reliability and maintainability distributions to the historical interruption data. The service efficiency and stability module analyzes the results of the previous two modules and evaluates the service efficiency and stability of rail transit service plans. Empirical results show that the established evaluation framework can not only evaluate the service efficiency and stability but also identify critical sections and time slots. This tool can help rail transit operators rapidly assess their operational changes and investment strategies related to efficiency and stability so as to provide efficient and stable services to their customers.     

Cost effective future derailment mitigation techniques for rail freight traffic management in Europe

Safe and reliable traffic management is vital for uninterrupted and successful operation of the European rail network, where mixed traffic (i.e. freight and passenger) services are run. Although rail freight derailment is infrequent, its consequences can be severe and may result in different forms of costs, including infrastructure; rolling stock; traffic disruptions; injuries and fatalities. The objective of this research paper is to conduct a cost benefit analysis (CBA) to identify cost effective mitigation techniques for efficient rail freight traffic management in Europe, by 2050. Reviewing previous derailments and studies, eight sets of derailment causes are analysed and, for each of them, sets of mitigation techniques are aimed at for their alleviation. The study finds that the highest cumulative costs of derailment are associated with ‘wheel failure’, while the lowest cumulative cost is identified for ‘excessive track width’. Regarding mitigation techniques, the lowest cumulative benefits are demonstrated for ‘track height’ interventions, whereas ‘wheel failure’ alleviation demonstrates the highest benefits, in value terms (all by 2050). In most cases, the benefit to cost ratio did not exceed 2.6; in two cases (‘track height’ and ‘rail failures’) the ratio remained below 1 – a negative outcome where cost is higher than benefit. The study suggests that the most cost-efficient interventions are those applied to ‘hot axle box and axle rupture’ and ‘spring and suspension failure’.     

巴基斯坦拉合尔市橙线无缝线路设计

无缝线路设计是轨道设计的关键问题之一。主要研究分析巴基斯坦拉合尔市橙线无缝线路设计方案,同时为国外高温地区无缝线路设计提供参考。橙线线路主要以高架线形式敷设,桥梁结构以U形简支梁为主。拉合尔地区整体气温偏高,历年最高气温47.4℃,橙线铺设普通区间无缝线路。通过理论计算与有限元分析,对钢轨强度与稳定性、桥梁墩台受力、钢轨断缝、轨缝值设置等进行了分析计算。研究表明:橙线高架线及地面线设计锁定轨温取(35±5)℃,轨缝值取8 mm是合适的,同时提出伸缩调节器的设置建议。     

空间状态轮轮(轨)接触点计算方法

轮轨接触几何关系是轮轨交通中最基本的问题。结合机车车辆在滚动(振动)台上进行台架试验的工况,以试验台的“轮轮”接触为研究对象,应用“迹线法”,提出在空间状态下轮轮接触点的计算方法。给出滚轮在正常位置时的轮轮接触关系计算公式,然后以此为基础,考虑包括滚轮的横向移动、垂向移动、轨底坡变化、摇头运动(模拟钢轨横向弯曲)、纵向位移误差等各种可能出现的滚轮空间状态,进而推导出滚轮在任意空间位置的轮轮接触点的计算公式,并可直接推广到轮轨接触计算中。     

重庆跨座式单轨系统限界检测设备的研究

跨座式单轨系统限界有其特殊性 ,尺寸控制非常紧 ,内容多而复杂。因此 ,该系统土建工程施工完后必须对全线断面的建筑限界进行检测。要进行准确高效的检测 ,需研发移动式检测设备 (限界检测车 )。在对跨座式单轨车系统限界分析研究的基础上 ,提出限界检测车的总体技术构想。     

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。