核燃料运输车2次缓冲装置的仿真分析

列出核燃料运输车2次缓冲装置的纵向动力学微分方程,采用变步长的Runge -Kuta积分法,对其进行了7种工况下的纵向动力学仿真分析。结果表明,在核燃料运输车上采用3级刚度的2次缓冲装置,满足核燃料货包在各种工况下的纵向加速度≤1 5g的要求,而且采用较大的摩擦因数有利于减小核燃料货包的纵向滑动行程     

乌鲁木齐西站驼峰场调车信号错开故障分析

乌鲁木齐西站II场在办理开放峰尾编3线的调车信号时,若编3线与编2线交汇处449#道岔因设备故障造成道岔定位无表示,将错误开放编2线的调车信号。为了解决因道岔无表示错误开放编2线信号的故障,在编2线调车信号机励磁电路中增加449#道岔的FBJ励磁接通条件,解决调车信号错误开放的故障。     

无线调车机车信号和监控系统车地通信的模型设计

指出了当前机车调车方法的不足,介绍了无线调车机车信号和监控系统的基本原理,设计了在无线调车方式下的车地通信模型,并说明了该模型中应该注意的一些问题.     

杭州地铁工程进度计划管理

文章结合杭州地铁建设实践，介绍了工程进度计划管理的组织、流程和经验，指出进度管理过程中存在的问题并提出相应的解决方案，最后就如何加快地铁建设提出几点建议，为其他城市地铁进度计划管理提供参考。     

成兰铁路茂县隧道大变形特征及施工技术

针对成兰铁路茂县隧道斜井和正洞挤压性大变形段采用常规控制措施未取得预期效果的问题，从软岩隧道大变形特征和施工技术手段入手，提出锚杆工艺改进措施，并对斜井变形情况、正洞锚杆工艺改进前后隧道变形和施工工期进行分析。结果表明： 1）大变形段水平收敛变形突出，变形时间长、速率大，斜井部分断面变形跳跃式增长； 2）斜井段变形量受断面形状影响最大，变形速率受开挖尺寸和埋深的影响最为明显； 3）锚杆施工质量对大变形控制起关键作用，可从用水量、成孔质量、水灰比和注浆方式等方面对锚杆施工工艺进行改进； 4）锚杆施工工艺调整后，段落平均变形值减小32.11%~58.86%，左右洞工期速度分别提升约172.73%和77.23%。     

基于轨道电路解决站内分路不良方案的研究

本文首先分析了我国站内轨道电路分路不良产生的原因，然后在分析国外解决分路不良方案的基础上，结合我国实际情况，提出了几种解决分路不良切实可行的技术方案。     

铁路货车及调车机跟踪管理系统的设计与实现

铁路货车及调车机跟踪管理系统采用基础数据层、业务逻辑处理层、数据展现和分析层三层结构设计。通过企业服务总线(ESB)整合现在车、行车日志、货运管理、车载计算机和GPS定位等现有应用系统,GPS实时定位调车机位置,完成调车计划执行的实时数据采集。     

Variations in household transport expenditure within major Australian cities

A comparative analysis of intra‐urban variations in household transport expenditure in 1966–68 is undertaken for the two largest Australian cities, Sydney and Melbourne, and one of the smaller State capitals, Adelaide. Regional variations in transport expenditure are found to be greater the larger the city; however residents of small cities are more dependent upon the car for their motorised travel. In the larger cities car dependence is most evident among low‐to‐middle income groups at a relatively early stage in the life cycle, located in outer suburban areas. Consequently high levels of expenditure on transport typically coincide with relatively high levels of financial commitments to home purchase and/or operation. This has significant ramifications for the household budget, the most notable being deficit‐funding, and reduced outlays on other expenditure items such as recreation and education. The distribution of company vehicles and allowances is shown to be of relatively greater benefit to higher income groups, although is not confined to them. Although somewhat dated, the findings suggest that the social impacts of rising prices for energy will almost certainly be regressive.

Note: This paper was presented to the 7th PTRC Summer Annual Meeting held at the University of Warwick in July 1979. The authors gratefully acknowledge the contribution of the Australian Road Research Board in the preparation of the paper. Particular appreciation is expressed to Dr. M. R. Wigan, Mr. K. Sharp and Dr. M. G. Lay for their helpful comments.     

路桥工程中不同施工阶段的管理措施分析

施工阶段的管理内容包括对成本、质量、进度以及安全的管理,只有做好这几方面的管理才可以促进路桥工程施工的进程,实现预期的目的.对路桥工程不同施工阶段的管理进行详细分析,以期为相关的实践提供理论基础.     

Competition in the UK passenger railway industry: Prospects and problems

The promotion of competition between passenger train operators was a key aim of the 1992- 97 Conservative Government when it privatized British Rail. Although the potential for competition in the market was constrained through regulation at the time of the sale, competition for the market became intense. Regulatory controls are now being relaxed and the promotion of competition remains central to the present Labour Government's rail strategy, particularly in the form of a redefined and reinvigorated franchising programme. It seems to be generally accepted in policy-making circles that it is both possible and desirable to encourage competition in the UK's railway industry on the grounds that it can further enhance service quality across the network. This paper highlights some qualifications to this position and suggests that, for various reasons, a strong policy emphasis on market liberalization may be impractical or unsuitable, at least in the short to medium term.