基于J2ME/Servlet技术的应用开发与研究

简要介绍了J2ME技术体系结构，以及MIDP简表下MIDlet程序的基本结构和生命周期，并在此基础上设计了一个基于J2ME／Servlet的手机成绩查询系统，通过示例介绍了J2ME程序如何通过Servlet实现对数据库的访问。     

法国ZTER型电动车组

介绍了法国ZTER型200 km/h电动车组的结构、主要参数及设备.     

IMMUNOHISTOCHEMICAL LOCALIZATION OF EPIDERMAL GROWTH FACTOR RECEPTOR AND C－erbB－2 ONCOGENE PRODUCT IN DEVELOPING HUMAN PLACEN

ＩＭＭＵＮＯＨＩＳＴＯＣＨＥＭＩＣＡＬＬＯＣＡＬＩＺＡＴＩＯＮＯＦＥＰＩＤＥＲＭＡＬＧＲＯＷＴＨＦＡＣＴＯＲＲＥＣＥＰＴＯＲＡＮＤＣ－ｅｒｂＢ－２ＯＮＣＯＧＥＮＥＰＲＯＤＵＣＴＩＮＤＥＶＥＬＯＰＩＮＧＨＵＭＡＮＰＬＡＣＥＮＴＡ（马军）（王作清）（苏宝...     

动力分散电动车组摆式动力转向架方案设计

借鉴国外摆式列车动车组研制开发的成功经验,在我国现有的动力转向架的基础上进行了三种方案的摆式动力转向架设计,并对其结构特点和主要技术参数进行对比分析,得出优选方案。     

高速动车组恒速控制策略的研究与仿真

为实现电动车组在0～250 km/h的速度范围内稳定运行,提出一种恒速控制策略.通过牵引控制与恒速控制之间平滑过渡,防止在不同控制方式之间切换时引起较大的转矩和电流波动.在速度低于125 km/h采用准恒转矩控制,速度高于125 km/h采用恒功率控制.采用直接转子磁场定向控制系统,牵引逆变器采用空间电压矢量控制的带中点钳位二极管的三电平拓扑结构.仿真结果验证系统具有良好的动态性能和稳态性能.     

机车牵引负荷试验轴承检测诊断系统

研制开发一套轴承工况检测与故障诊断系统,用于机车牵引负荷试验。系统通过检测振动和温度信号判断内燃机车走行部轴承的工作状况。把高阶谱引入机车轴承振动信号分析,用1(1/2)维谱提取轴承故障引起的振动信号非线性相位耦合特征来识别故障模式。试运行表明系统可靠,能满足机车段修现场轴承检测的需求。     

铁路第6次提速

从铁路信号技术的角度分析铁路6次提速的意义，着重介绍第6次提速的主要特征和列车运行控制系统CTCS2的系统构成和原理。     

CW-2系列转向架轴箱定位节点垂向刚度研究

介绍了CW—2系列转向架运用中出现的故障,结合轴箱定位结构分析了定位节点刚度较大带来的问题,并得出定位节点垂向刚度较大也是导致转向架出现较多运营可靠性问题的初步结论。利用动力学分析软件,计算了不同节点定位刚度对轮轨垂向力、构架垂向振动、节点处动态垂向力和车辆其他动力学性能的影响趋势,以TGV高速列车的2种转向架的试验比较进行了验证。     

DSS2点到点信令呼叫连接/释放过程分析

介绍宽带综合业务数字网络中用户与ATM交换机之间使用的信令，即2号数字用户线信令DSS2的基本概念和Q2931消息格式的组成、各部分的内容与功能、编码及其意义，介绍DSS2点对点呼叫连接／释放控制中的定时器和状态的定义与意义，以一次成功的呼叫建立与释放过程为例，结合定时器和状态的应用详细地分析了DSS2呼叫连接／释放处理的工作过程。     

Total dynamic response of a PSS vehicle negotiating asymmetric road excitations

A planar suspension system (PSS) is a novel automobile suspension system in which an individual spring–damper strut is implemented in both the vertical and longitudinal directions, respectively. The wheels in a vehicle with such a suspension system can move back and forth relative to the chassis. When a PSS vehicle experiences asymmetric road excitations, the relative longitudinal motion of wheels with respect to the chassis in two sides of the same axle are not identical, and thus the two wheels at one axle will not be aligned in the same axis. The total dynamic responses, including those of the bounce, pitch and the roll of the PSS vehicle, to the asymmetric road excitation may exhibit different characteristics from those of a conventional vehicle. This paper presents an investigation into the comprehensive dynamic behaviour of a vehicle with the PSS, in such a road condition, on both the straight and curved roads. The study was carried out using an 18 DOF full-car model incorporating a radial-spring tyre–ground contact model and a 2D tyre–ground dynamic friction model. Results demonstrate that the total dynamic behaviour of a PSS vehicle is generally comparable with that of the conventional vehicle, while PSS exhibits significant improvement in absorbing the impact forces along the longitudinal direction when compared to the conventional suspension system. The PSS vehicle is found to be more stable than the conventional vehicle in terms of the directional performance against the disturbance of the road potholes on a straight line manoeuvre, while exhibiting a very similar handling performance on a curved line.