基于CAN总线的机车电气监控系统的设计

介绍CAN总线及其相关协议,设计了基于CAN总线的机车电气监控系统的硬件结构,阐述了现场控制模块应用层通讯协议的设计并给出了具体的流程图.     

基于HLA的分布式三维视景列车运行模拟器的设计与实现

介绍一种基于HLA的三维视景列车运行模拟器.该模拟器可以接入CTCS3列控系统仿真测试平台,以三维视景输出方式,模拟列车运行.同时,模拟器之间可以通过RTI互相连接,仿真多辆列车运行.对该模拟嚣的软件框架设计和各个功能模块实现进行简要介绍.     

半主动悬挂减振器控制系统的研究

介绍丰主动悬挂减振器控制系统的组成及工作原理,分析不同控制方法的可行性.控制系统的核心是阻尼器的控制策略,基于DSP芯片,相对常用的单片机有更多的灵活性和可靠性.采用DSP芯片实现所实施的控制策略.利用MATLAB对控制系统进行仿真.结果表明,在列车上安装半主动横向残振器能有效改善丰体的横向运行平稳性.     

DJ1型交流电力机车通信网络与控制系统

介绍DJ1型交流传动电力机车通信网络与控制系统的结构和原理,重点介绍该系统的功能、特点与应用效果.     

关于客运专线列车运行控制系统的探讨

在分析国外先进列车控制系统发展的基础上,结合我国的国情、路情对我国的客运专线列控系统设计提供参考.     

客运服务综合控制系统的设计与实现

分析车站客运信息发布的现状,提出客运服务信息综合控制系统的设计目标,从功能、网络和软件结构等方面介绍系统的构成,描述系统实现过程中所采用的技术,最后对系统的技术特性、应用情况进行总结.     

角色访问控制在青藏铁路电务管理系统中的应用

用户权限管理是青藏铁路电务信息系统设计中的重要环节,是电务部门安全运行的有力保证.简要介绍基于角色的权限管理,并提出一种通用动态用户权限管理方案及实现方法.     

公路施工企业降低生产成本提高经济效益的对策

文章分析公路施工企业生产成本高利润率低的现状及成因,针对当前的市场环境,提出公路施工企业降低生产成本,提高经济效益的六大对策,论证提高企业管理能力和核心竞争力是改变现状的根本办法。     

A framework for user- and system-oriented optimisation of fuel efficiency and traffic flow in Adaptive Cruise Control

Fully automated vehicles could have a significant share of the road network traffic in the near future. Several commercial vehicles with full-range Adaptive Cruise Control (ACC) systems or semi-autonomous functionalities are already available on the market. Many research studies aim at leveraging the potential of automated driving in order to improve the fuel efficiency of vehicles. However, in the vast majority of those, fuel efficiency is isolated to the driving dynamics between a single follower-leader pair, hence overlooking the complex nature of traffic. Consequently fuel efficiency and the efficient use of the roadway capacity are framed as conflicting objectives, leading to fuel-economy control models that adopt highly conservative driving styles.This formulation of the problem could be seen as a user-optimal approach, where in spite of delivering savings for individual vehicles, there is the side-effect of the deterioration of traffic flow. An important point that is overlooked is that the inefficient use of roadway capacity gives rise to congested traffic and traffic breakdowns, which in return increases energy costs within the system. The optimisation methods used in these studies entail high computational costs and, therefore, impose a strict constraint on the scope of problem.In this study, the use of car-following models and the limitation of the search space of optimal strategies to the parameter space of these is proposed. The proposed framework enables performing much more comprehensive optimisations and conducting more extensive tests on the collective impacts of fuel-economy driving strategies. The results show that, as conjectured, a “short-sighted” user-optimal approach is unable to deliver overall fuel efficiency. Conversely, a system-optimal formulation for fuel efficient driving is presented, and it is shown that the objectives of fuel efficiency and traffic flow are in fact not only non-conflicting, but also that they could be viewed as one when the global benefits to the network are considered.     

Have Emission Control Areas (ECAs) harmed port efficiency in Europe?

Ports in the European Union and North America have enforced environmental regulations on controlling SO_x and NOx emissions from ships in their coastal areas known as Emission Control Areas (ECAs). This study uses two-stage approaches to examine whether ECA regulations impact the efficiency of ports operating in such areas. First, port efficiencies are estimated using non-radial slacks-based measure (SBM) Data Envelopment Analysis (DEA) models. The efficiency scores estimated by the SBM DEA models are then regressed on explanatory variables, including the ECA factor, and macroeconomic indicators using bootstrapped truncated regression (BTR) models. Panel data is collected on countries in EU ECAs and non-ECAs regarding such input variables as capital and labor, with cargo as an output variable. The results indicate that ECA regulations can harm port efficiency, reflecting concerns of policy-makers and industrial managers: the average efficiency loss from an ECA designation amounts to 0.058–0.066 on a scale of 0–1, accounting for a 15–18% loss from ECA ports’ average efficiency scores.