基于FPGA液力传动内燃机车CAN通讯单元设计

开发设计了一种基于FPGA,能够对内燃机车发动机和变速箱的控制系统的行车数据、故障数据等稳定传输的CAN总线通讯电路.所设计的接口电路基于SAE J1939协议,由FPGA微处理器、CAN控制器等硬件电路以及软件设计组成.此方案可以大大节省CPU的开销,提高系统整体的工作效率,满足系统的高实时性和稳定性要求.     

客车前风挡玻璃粘接力计算分析

随着客车技术的渐渐成熟,人们对客车的安全系数有了越来越高的要求。尤其对于在公路上高速行驶的客车来说,安全因素是考虑的首要因素。以下针对客车前风挡玻璃在高速行驶,紧急制动情况下受力状态加以阐明。     

通道式客车瞬间转向失控成因分析

本文从转向运动学的角度,对通道式客车发生瞬间转向失控的形成原因进行了分析,并提出了防止的方法与措施.     

公交车辆班次供应智能监管技术浅析

上海市城市交通运输管理处已建成一套基于GPS定位技术的公交车辆营运监管系统,可以对线路车辆班次供应情况进行智能化监管,该系统的数据主要由车载GPS终端分发获取,由于GPS技术本身的局限性,使得车辆在首末站数据包丢失,无法做到准确统计.本文提出远距离射频识别技术与GPS技术相结合的办法,可以使公交车辆经过首末站的识别率达...     

公交场站利用地热能供暖及制冷的实践与分析

对北京公交集团老旧公交场站办公区及生活区供暖制冷方式进行改造,将原冬季燃油锅炉供暖和夏季分体式空調制冷方式改造为地埋管地源热泵系统,为场站的办公区及生活区冬季供暖和夏季制冷提供更好的方式,并达到节能减排的目的.     

电容补偿装置投切过电压的防护措施研究

对采用阻尼与限压措施消除电容补偿装置投切过电压可能存在的危害进行了理论与仿真分析,并指出：投入过电压的防护主要应依靠装置本身的绝缘结构能力来实现,阻尼限压等保护措施对之效果不明显;截流过电压对开断时电弧重燃起重要的助推作用,电弧重燃会产生破坏力极大的过电压,利用高阻值阻尼电阻可消除截流过电压对电弧重燃的影响。     

车内有害气体分析和净化的有效途径

通过车内有害气体对驾乘人员健康的危害性分析,介绍客车行业当前不容忽视的环保问题;结合国内客车车内空气污染的普遍现象,有针对性地提出相应的解决方法,特别指出新材料光触媒净化车内空气的科学性和有效性.     

Using intelligent agents for Transportation Regulation Support System design

This paper presents an agent-based approach used to design a Transportation Regulation Support System (TRSS), that reports the network activity in real-time and thus assists the bus network regulators. The objective is to combine the functionalities of the existing information system with the functionalities of a decision support system in order to propose a generic model of a traffic regulation support system. Unlike the other approaches that only deal with a specific task, the original feature of our generic model is that it proposes a global approach to the regulation function under normal conditions (network monitoring, dynamic timetable management) and under disrupted conditions (disturbance assessment and action planning of feasible solutions). Following the introduction, the second section presents the notions of the domain and highlights the main regulation problems. The third section details and motivates our choice of the components of the generic model. Based on our generic model, in the fourth section, we present a TRSS prototype called SATIR (Système Automatique de Traitement des Incidents en Réseau – Automatic System for Network Incident Processing) that we have developed. SATIR has been tested on the Brussels transportation network (STIB). The results are presented in the fifth section. Lastly, we show how using the multi-agent paradigm opens perspectives regarding the development of new functionalities to improve the management of a bus network.     

To competitively tender or to negotiate - Weighing up the choices in a mature market

A key attribute of competitive tendering for the periodic selection of operators of subsidised public transport services is to secure the provision of specified services at efficient cost levels. This has proved particularly effective where services were previously provided by an inefficient monopoly operator. The arguments for the adoption of competitive tendering in preference to negotiation with the incumbent operator may be less clear-cut in other cases.Consideration is given to both theoretical and practical insights into the relative merits of competitive tendering and negotiation approaches in such situations. The limited literature on the topic is reviewed and insights and lessons identified. Influencing issues include prior conditions, the nature of the supplier market, features of contracts, negotiating and competitive tendering strategies and practice, accountability and transparency, and long-term market implications. The evidence suggests that ‘one size does not fit all’, and the choice will depend on specific circumstances.The relative merits of the two approaches for renewal of bus contracts are considered with regard to Adelaide, for contracts which have previously been awarded through competitive tendering. The paper draws out the main factors that could influence the authority’s choice between the options, and discusses the relevance of the findings to other situations.     

Workshop report - Benchmarking the outcome of competitive tendering

Workshop 1 was concerned to identify the real results of competitive tendering, and experience on how to make it work better, using evidence from the rail and bus sectors in a large number of countries spread around the world. It was found that competitive tendering had generally been successful in terms of quality and costs, but problems had occurred in a number of cases, so careful attention must be paid to the design of tendering exercises, details of the contract, risk-sharing arrangements and the approach to any re-negotiation found to be necessary. As a result, an important conclusion is that the tendering authority needs a high degree of expertise in these issues; any thought that competitive tendering relieves the public authority of the need for expertise in public transport is mistaken.