低地板轻轨车辆辅助电源系统的分析

对低地板轻轨车辆辅助电源的几种电路结构进行了分析、比较,并结合国内低地板轻轨项目,对设计辅助电源系统提出了一些建议,同时对该方案进行了简单的Matlab仿真。     

上海龙腾大道淀浦河桥主桥设计

介绍了龙腾大道(罗秀东路~徐浦大桥)道路工程淀浦河桥主桥概况、结构设计、结构体系以及桥梁特色。淀浦河桥主桥采用连续V构+挂孔梁体系,桥跨布置为20 m+30 m+35 m+48 m+108 m+48 m+35 m+20 m,主梁、V墩采用钢结构,钢筋混凝土矩形承台,钢管桩基础。     

Cooperation in transit delivery in West German metropolitan areas

West Germany is densely populated, averaging 245 inhabitants/km², but varying widely between urban agglomerations and rural areas. Transport volume has increased by 40% since 1970, with virtually all growth due to private automobiles. Since 1981 public transit has been suffering from decreasing demand.A 1964 Expert's Report to the German federal government was the stimulus for initiating an effective funding mechanism for new public transit construction. In 1965 Germany's first federated transit authority was founded for the region of Hamburg.Principal among the goals of any cooperative agreement among transit companies are improvements for the passengers and improvement of revenues for the companies. To attain these ends, two distinct forms of transit aggrements have been developed in Germany: transit cooperative (Verkehrsgemeinschaft) and transit federation (Verkehrsverbund). The former is more suitable for smaller to medium-sized towns, while the latter is more suitable for larger cities. The two types are described in this article.German transit federations during the 1970s succeeded in significantly increasing ridership, while during the 1980s patronage has either remained steady or has declined. Yet transit federations showed much better perfomance than did public transit in general. In terms of costs and revenues, no public transit organization in Germany is able to break even; deficits vary between 42% and 55%. The author concludes, however, that hidden subsidies for automobile traffic are far higher, because of environmental damage and the high social cost of traffic accidents.     

锚链轮的结构设计

我国的锚链轮以往都是根据苏联的指导性技术文件PC-246-52进行设计制造的,该锚链轮对锚链的制造误差反应很敏感,在工厂台架试验和实船使用中反映不少问题,其中跳链现象较为普遍,不少制造厂在锚机出厂前采用打磨堆焊等方法来弥补原链轮齿形的不足。 本文所介绍的锚链轮的几何计算和力学分析方法,先后经过了φ40、φ43、φ46、φ57、φ66等几挡的试验鉴定,都得到工作平稳、无冲击、无跳链的满意结果,在浙江海运局的一万吨运煤船和上海海运局的五千吨油轮的实船使用中也得到同样结果。根据本文计算方法编制的专业标准“锚链轮”CB~*3179-83已由全国船舶标准化委员会甲板机械分委会第三次全会审查通过。     

ANSYS在东风EQ140汽车车架刚度分析中的应用

应用ANSYS软件,完成了东风EQ140型汽车车架的刚度分析过程。通过建模、加载、解算及后处理等一系列步骤获得车架的扭转变形及应力,揭示出车架横梁在后桥支撑点存在扭转变形最大的问题,为车架的优化设计提供了重要依据。     

电力机车辅助电动机设计新方法：全方位设计

介绍了劈相机系统辅助电动机的全方位设计思想及内容。     

城市地铁与轻轨车辆辅助系统综述

概述城轨交通车辆辅助系统的发展，介绍几种进口地铁与轻轨车辆静止辅助系统的基本结构，并且作出比较和评述，结合目前国内外情况，指出辅助系统的发展趋势。     

SS_9型机车转向架构架防寒改造及强度分析

介绍了SS9型机车转向架构架的防寒措施,并利用I-deas分析软件对其构架进行了强度计算分析,分析结果显示构架强度满足设计要求,其防寒改造是成功的。     

模态试验分析对解决汽车振动问题的应用

针对某车辆在行驶试验时,在车速57 km/h时出现低频5.4 Hz的驾驶室异常振动的现象,振动形式为俯仰振动,人体乘坐舒适性主观感觉很差。先后采用多种常规振动分析试验方法对该车进行振动分析,也未能分析出引起驾驶室异常振动的原因。最后对该车的车架和驾驶室进行模态试验分析,分析判断得出该车在行驶时驾驶室异常振动的频率与车架整体一阶弯曲时的接近,由此判断该车驾驶室异常振动是由车架整体-阶弯曲引起的。根据试验分析结果,文章最后对某车问题的改进方案综合评价后提出了合理的改进方案。