Managing transportation during highway reconstruction: A recommended process

Major highway reconstruction can cause significant disruptions to existing travel patterns and economic activity. Reducing these impacts on travelers, shippers, businesses and residents requires that innovative and effective transportation management actions be developed and implemented. This paper reports the major findings and recommendations of a research study on managing transportation during highway, reconstruction. The primary objectives of the study were

Joint development at transit stations in the United States

Joint development, as the term is generally used in connection with transit systems in the United States, is real estate development that is closely linked to public transportation services and station facilities, and takes advantage of the market and locational advantages provided by them. Research conducted by LEK Associates for the Urban Mass Transportation Administration (UMTA) suggests that, in addition to helping shape urban growth and land development, joint development is also a surprisingly effective means of increasing transit system ridership and farebox revenues, as well as a source of increasingly significant revenues from the sale or lease of air rights.The completion of nine joint development projects in as many different cities, started under the former Urban Initiatives Program, for example, net additional annual ridership might reach 12000000 one-way trips. Net additional annual farebox revenues might reach over $9000000. This added revenue would be sufficient to repay the $62 million combined UMTA/transit operator investment in the nine projects, exclusive of the costs of the basic transit system improvements around which the projects are planned, in less than six years.Among transit authority-administered joint development programs examined in a separate study, the Washington Metropolitan Area Transit Authority (WMATA) has had the most success in generating significant value capture income. For example, the cumulative revenue realized by WMATA from just six joint development projects in the Washington, DC region, through September 1983 exceeded $ 6.9 million. Projections through fiscal year 1986 indicate cumulative revenues approximating $ 28 million will be received from developer leases.     

Urban transportation modeling: The discussion continues

This article is a response to John Polak's article, entitled, A Comment on Supernak's Critique of Transport Modeling, published elsewhere in this issue of TRANSPORTATION. It offers necessary clarifications to the issues discussed in an earlier article in this journal (Supernak, 1983). It also responds to the philosophical issues discussed in Polak's article, such as the nature of transport phenomena, and the role, form and methodology of transport modeling.     

Regional impacts of new transport infrastructure: a multisectoral potentials approach

This is the second of two background papers sponsored for the Symposium by the Administrative Commission for the north of the Netherlands. Its purpose is to provide an indication of the effects of the proposed high speed rail line between Amsterdam, Groningen and Hamburg on employment in the corridor. The authors first review the techniques of forecasting these effects discussed in the literature. The potentials approach is adopted for their analysis, the mathematics and underlying assumptions of which are presented. Finally, this model is run to provide an estimate of the impact on regional employment of three variants of the proposed rail line.     

The design of bus route systems — An interactive location-allocation approach

An interactive modelling approach is developed to solve the practical problem of bus route network design. Possible bus routes are identified with facilities which can be located. Zones or pairs of zones in the urban area are identified with customers who will be allocated to the established facilities. It is shown that the classical Set Covering Problem is useful under the assumption of fixed demand; the Simple Plant Location Problem is effective under the assumption of demand which is sensitive to the level of bus service provided.     

人类仿真技术在铁路系统中的应用

摘要：对应用于铁路人机工程学的人类仿真方法进行了总结,即一种仿真器是采用虚拟现实技术来模拟环境,例如驾驶仿真器、乘坐舒适度仿真器、铁路车站仿真器等。另一类仿真器则采用计算机仿真技术来评价列车司机工作时承受的精神负担、列车碰撞引起的旅客运动方式及损伤等。     

120阀铝合金阀盖运用故障分析

120阀铝合金阀盖在运用中出现故障,通过对120阀铝合金阀盖材质与结构的分析,并与国外铝合金阀盖的对比,从材质和结构上对120阀铝合金阀盖提出解决问题的措施。     

CRH3动车组辅助变流器半实物仿真数据监测台

结合辅助变流器半实物仿真的需求,搭建数据监测平台,实现对高速动车组辅助变流器控制器的分析研究。首先,提出了基于工控机与数据采集卡的采集架构,搭建监测台的硬件平台。根据不同开发环境的比较,确立基于VB语言的Visual Basic软件作为开发环境。其次,针对采集卡数据读取瓶颈的关键问题,给出了DMA读取的解决方案。并且通过VB调用Windows API函数,提出了双缓存显示方案,解决了显示过程中存在的问题。最后介绍了半实物仿真数据监测界面的结构和功能。     

基于有限元法的屏蔽门机械系统结构响应分析

建立了地铁站台屏蔽门机械系统的结构分析模型,利用有限元法分析了屏蔽门系统模态和结构刚度,得到屏蔽门系统的各阶主要模态的特性和屏蔽门整体及各关键部件的变形及应力分布.运用该分析方法对屏蔽门整体机械系统的结构特性及其可行性进行评价,为屏蔽门机械系统优化和可靠性设计提供了理论基础.