Active Roll Control for Passenger Cars

The development of a mathematical model of a limited bandwidth hydro-pneumatic suspension that is incorporated into a vehicle handling model is described. The combined model is used to evaluate a suitable control strategy for eliminating body roll during a cornering manoeuvre. The philosophy behind the roll control strategy has been to use feedback measurements of the body motions which do not compromise the ride control. A study of the influence of the position of the body motion feedback transducer on the effectiveness of the system to reduce the body roll is presented. Non-linear modelling of the suspension components for a 0.8g cornering manoeuvre has revealed performance limitations. Conclusions are drawn as to the effectiveness of the control scheme.     

GSM-R系统可靠性分析与评估

GSM-R 铁路专用无线通信系统在我国的应用已经起步,其系统可靠性尚待实际营运的考验。本文应用故障模式影响分析法(FMEA)和故障树分析法(FTA)对 GSM-R 系统的可靠性进行了分析和评估, 针对话音业务和数据业务的阻塞问题以及切换与中断问题给出了相应的解决措施,并讨论了提高 GSM-R 系统可靠性设计的相关对策。     

基于杆梁模型的舰船隔振系统功率流传递特性分析

针对舰船中比较典型的静不定隔振系统，建立了柔性基础上安装4个隔振器的隔振系统物理模型。对隔振器采用杆梁模型建模，隔振上层设备采用刚体模型，导出了静不定隔振系统的动力控制方程。使用振动功率流方法对隔振系统进行了功率流分析，并利用Matlab进行编程计算，计算结果表明杆梁模型隔振器对上下两端的功率流的减少有明显效果，隔振器的内部共振特性对隔振系统振动功率流具有显著的影响。对主要设计参数进行了讨论，得出了具有工程指导意义的结论。     

A study of passenger discomfort measures at the Hong Kong mass transit railway system

This note investigates the important attributes relating to the crowding effects at the Mass Transit Railway (MTR) stations in Hong Kong. Data was collected at two sets of three MTR stations to study the responses of the passengers due to the discomfort at crowded vehicles and platforms. Stated preference surveys were used to study the effects of passenger discomfort measures.     

铁路行车事故分析中的语音压缩方法

在铁路运输中，安全行车是第一位的。一旦出现行事事故，对事故原因的分析往往十分棘手。采用黑匣子技术能够准确地记录列车运行中的各种信息，但巨大的语音存储量需求是黑匣子技术的一个难关。若采用传统的语音压缩技术，则理论和实现都很复杂，并且成本太高。采用神经网络不仅简单易行，还有提高信噪比的功能。     

模拟异种钢接头蠕变力学特性的数值分析

利用有限元数值模拟了高强匹配异种的接头在弹性－蠕变条件下的应力／应变场，结果表明，接头的应力／应变分布不均匀，在焊缝界面上，应力和应变分别呈不连续和不协调分布特性，并随着拦头各区蠕变强度差别的增大，其分布梯度增大，峰值应力／应变提高，因此，蠕变强度梯度大的高强焊缝和低强母材的界面是接头的薄弱部位。     

The role of professional associations in shipping

This article is in three parts. The first covers the historical development of qualifying associations. The second covers the particular role of maritime institutions that include The Royal Institution of Naval Architects, The Institute of Marine Engineering Science and Technology and The Nautical Institute. The third and final section considers the future for maritime professional associations in the context of international shipping.     

JKLP-Ⅰ型机车语音记录系统的研制与开发

本文主要介绍JKLP—Ⅰ型机车语音记录系统的工作原理、系统结构以及功能特点等。     

隧道内断轨监测装置及电路抗干扰措施

1前言 目前,检查钢轨的主要手段,是采用钢轨探伤小车与巡道工巡视相结合的方式.在长大隧道内,由于受环境条件所限,很难及时查出钢轨的折断.为此,柳州铁路局科研所研制了一套用于实时监测长大隧道钢轨折断的装置,弥补了探伤小车和巡道工检查的不足.该装置采用微型计算机对隧道内钢轨进行实时自动监测,操作简便,勿需专人管理,一旦检测出钢轨、鱼尾板折断或有车辆占用,能及时、准确地自动报警,并将故障(占用)位置、打印和显示出来,有效地确保了故障的及时排除和行车安全.     

Development and Deployment of Public Transport Policy and Planning in Taiwan

Over the past decade, the escalating roadway congestion and environmental deterioration due to heavy use of private vehicles have provoked the Taiwan government to realize the importance of public transport systems. Under the “carrot-and-stick” rationales, the government has formulated public transport policies and exercised a series of related initiatives by providing sufficient and higher quality of public transport services so as to attract more private vehicle users. In this paper, the planning philosophy and policy formulation of Taiwan’s public transport development are highlighted. The most important initiatives, including the Five-year Enhancement of Mass Transportation Program and the upgrading public transport schemes in the National Development Plan are examined. Based on previous experience and lessons, we point out the most challenging issues that the government will encounter. Suggestions for the future of public transport planning are also addressed.