基于改进模糊综合评价的走行部安全评估方法研究

采用改进层次分析法分析轮对轴箱装置、构架、弹簧悬挂装置、中央牵引装置、基础制动装置、驱动装置及相互之间的重要度,采用模糊综合评价方法建立城市轨道交通车辆走行部综合安全评估模型进行评估。在改进层次分析法中,提出采用聚类分析采集模糊风险评价集中的风险隶属度矩阵。针对评估结果探讨了采用风险控制措施降低风险的方法。     

基于主成分分析的应急保障军队车辆器材供应商选择

分析了突发事件中军队车辆器材应急保障的特点,在此基础上建立了军队车辆器材供应商评价的指标体系,并将主成分分析应用于供应商的评价选择。根据应急保障车辆器材供应商的实际指标数据进行了实例计算,并对各供应商进行综合评价,验证了主成分分析在应急保障车辆器材供应商选择上应用的可行性与准确性。     

跨区机动部队车辆器材保障对策研究

指出了部队执行多样化军事任务时在跨区机动过程中器材保障面临机动距离远、保障对象角色转换多元等诸多问题,并从增强保障灵活性、时刻性、持续性以及运用科学保障手段几方面提出了解决对策。     

自然灾害下的公交疏散路线模型

自然灾害通常给社会带来巨大的危害,以自然灾害所引起的紧急情况作为研究背景,进行应急交通疏散预案研究。讨论自然灾害下的应急交通疏散问题并重点探讨疏散路线设计、疏散时间计算,用以达到在自然灾害发生前将人们转移至安全地点的目的。利用公交车作为疏散工具,将公交疏散路线问题归为带时间窗的车辆路径问题(VRPTW),建立基于VRPTW的公交疏散路线模型,以某地区为案例利用TransCAD软件中的车辆路径功能(VRP功能)设计疏散路线,得到标有疏散时间和疏散路线的地区图形,并最终计算得到每条路线的疏散时间、疏散人数、公交车数等信息。     

电动汽车所用电控系统性能介绍及设计

本文简要介绍电动汽车所用电机控制器的种类、结构、工作原理、特点和设计。     

我国信贷资产证券化试点之法律分析

以我国正在试点的信贷资产证券化所涉及的各个主体为切入点,分析了各参与主体的(?)叫、义务和信贷资产证券化参与主体间两类最重要且法律性质截然不同的法律关系,特别分析了两类法律关系中各主体可能面临的法律风险或法律障碍,得出了必须消除信贷资产证券化法律障碍、完善其运行法律环境的结论。     

车辆自动识别系统移动站及其在城市交通监管中的应用

车辆自动识别系统 (AVI)移动站具有机动、快速和自动识别车辆的特点 ,适合于在城市监管中广泛应用。它采用射频识别 (RFID)技术 ,通过车卡 (TAG)采集车辆数据信息 ,对车辆进行自动识别和处理 ,识别率超过 99%;采用视频识别 (VFID)技术 ,通过摄像机采集车辆图像信息 ,在光照较强的情况下 ,识别率可以达到 80 %以上。     

Cost savings of using a marketable permit system for regulating light-duty vehicle emissions

In the USA, each individual vehicle is required to meet uniform per-mile emission standards. The uniform standard system does not allow vehicle manufacturers flexibility in achieving overall emission reduction goals for motor vehicles. The system provides manufacturers with little or no incentive to control vehicle emissions beyond what is required. In this paper, an incentive-based marketable permit system is proposed to replace the uniform standard system. Under the marketable permit system, vehicle manufacturers are required to meet corporate average emission standards; they are allowed to buy or sell vehicle emission reduction credits among themselves to meet corporate average standards; and they are allowed to bank vehicle emission reduction credits that are accumulated in earlier years and to use the credits for meeting average standards in later years. It is estimated in this study that relative to the current uniform standard system, the marketable permit system can reduce vehicle emission control costs by $150 to $400 million per year in California, or 13–30% of the costs currently spent on vehicle emission control.     

汽车装配物流输送机系统结构的优化设计与应用

通过对输送机承载小车轴承提前失效现象的理论分析,得出其主要失效原因是轴承自身强度不足及润滑不良。由此症结寻求对策：设计非标整体轴承滚轮,辅以油嘴油槽加注油脂以改善轴承润滑,从而达到延长轴承使用寿命的目的。     

Recreation vehicles : A perspective

The growth and popularity of recreation vehicles in the United States and other countries has implications for the travel and tourism industry. Owners of these vehicles require no separate lodging facilities while traveling and rarely patronize hotels or motels. They often perceive that they spend less for their vacations by staying at travel parks and campgrounds, but survey results and comparative cost analysis reveal that they spend more than automobile travelers when total fixed and variable costs are taken into account. Recreation vehicle (RV) preferences by income category suggest alternative modes of recreation travel and a vacation life style which has considerable appeal. This “RV life style” is characterized by a strong desire to experience the outdoors and socialize with other campers while still retaining the comforts and conveniences of a familiar domicile. Limiting characteristics include the provincial nature of recreation vehicle travel and the impact of mandatory fuel conservation measures.