交通控制测试体系的公交优先系统应用研究

随着传感器、信息技术等的发展,交通控制的概念已经由传统的、单一的交通信号控制向集交通信号、交通诱导、交通信息采集与处理以及基于车载的交通诱导等为一体的、集成化、协同化的智能化交通控制系统转变。目前,国内对于智能化交通控制系统缺乏一套有效的测试体系,从而造成了交通控制系统上下端设备的性能、功能差异非常大,交通控制系统产品市场监察手段缺失,交通管理的效率和成本得不到有效控制。公交优先系统在国内发展尚处起步阶段,公交优先相关技术和系统的应用是否成熟,功能、性能是否能够满足当前需求,系统的可靠性、容错性等是否满足工程建设及应用的要求,是使用者关心的核心部分。本项目首先简要介绍智能化交通控制系统的测试体系,并应用该测试体系,研究分析公交优先系统的测试需求,并提出了针对北京市公交优先信号系统的测试方案。     

全承载技术在IKARUS出口车上的应用

本文简要介绍了全承载技术的定义、特点及其国内应用现状,并着重探讨了全承载技术在我公司伊卡鲁斯出口客车实际应用中的工艺流程、实际问题及采取的工艺措施。     

基于全制造服务周期的智能工厂系统结构模型

为支撑工厂的制造智能化,需要建立有效的运营支撑系统。智能工厂的运营支撑系统应在保护既有遗存系统和制造资源的基础上,满足制造资源动态配置的需求及制造服务化需求,实现多系统间集成。基于从研发创新到产品运维的全制造服务生命周期迭代过程,构造智能工厂系统结构参考模型。模型从微服务架构出发,建立制造资源的分类树,并进行服务封装,构造微制造服务单元,通过改进的企业业务总线和集成开发环境,发布制造应用,实现智能工厂运营支撑系统。基于微服务的企业业务总线既保持对遗存系统的继承,也可弹性部署以支持不同规模的智能工厂。企业业务总线在智能工厂环境下的数据总线、知识总线、流程总线和安全总线子类,及多个服务域的部署通过案例予以阐明。     

Efficiency measurement of bus routes and exogenous operating environment effects on efficiency

This study develops an independent efficiency measurement model framework of bus routes, so as to treat preferably the heterogeneous outputs in a data envelopment analysis (DEA)-based efficiency measurement. It then introduces four new exogenous operating environment factors at the microscopic level of bus routes, and applies the three-stage DEA approach to incorporate operating environment effects and statistical noise into the efficiency measurement framework. The main purpose is to measure impartially the managerial efficiency of bus routes, purged of operating environment effects and statistical noise, and additionally to investigate the operating environment effects on efficiency. An empirical analysis, based on 39 routes operated in Jiangyin City, China, is presented. The principal finding is that the adoption of the independent efficiency measurement model framework is reasonable and has many virtues. Moreover, the proposed approach could substantially provide decision support both for regulators and for producers of bus services. In addition, the operating environment does indeed significantly affect operating efficiency and quality efficiency, especially the latter.     

中关村大街公共交通改善对策研究

本文首先分析了现状公共交通的特征 ,并结合公交远期的发展 ,就如何解决好中关村地区的公共交通问题做一下探讨     

A new approach to evaluating on-road public transport priority projects: balancing the demand for limited road-space

Despite widespread growth in on-road public transport priority schemes, road management authorities have few tools to evaluate the impacts of these schemes on all road users. This paper describes a methodology developed in Melbourne, Australia to assist the road management authority, VicRoads, evaluate trade-offs in the use of its limited road-space for new bus and tram priority projects. The approach employs traffic micro-simulation modelling to assess road-space re-allocation impacts, travel behaviour modelling to assess changes in travel patterns and a social cost benefit framework to evaluate impacts. The evaluation considers a comprehensive range of impacts including the environmental benefits of improved public transport services. Impacts on public transport reliability improvements are also considered. Although improved bus and tram reliability is a major rationale for traffic priority its use in previous evaluations is rare. The paper critiques previous approaches, describes the proposed method and explores some of the results found in its application. A major finding is that despite a more comprehensive approach to measuring the benefits of bus and tram priority, road-space reallocation is difficult to economically justify in road networks where public transport usage is low and car usage high. Strategies involving the balanced deployment of bus and tram priority measures where the allocation of time and space to PT minimises negative traffic impacts is shown to improve the overall management of road-space. A discussion of the approach is also provided including suggestions for further methodology development.

大客车结构有限元分析及轻量化设计

建立了某型大客车结构有限元模型,验证了该模型的正确性。完成了整车振动模态、扭转刚度的分析。在此基础上,以壳单元厚度为设计变量,以1阶扭转频率和扭转刚度为联合约束函数,以整车质量最轻为目标函数进行结构优化设计。通过对整车刚度、模态和强度的分析与校核,表明该大客车轻量化方案满足性能要求,具有可行性。     

总线式车身控制系统的规则化建模方法

提出一种新的汽车车身控制系统建模方法,采用汽车总线技术构建车身控制网络,用规则化描述方法进行建模。将组成系统的对象分解为多层,用逻辑规则表达式来描述系统对象之间的逻辑控制关系,用消息来传递控制关系。该方法易于理解和掌握,可降低系统设计与开发的难度,提高系统的可靠性和易维护性。     

某型大客车车身骨架轻量化设计

通过建立车身骨架有限元模型并结合截面尺寸设计计算公式,提出按客车总成建模、按内力调整截面尺寸的车身骨架设计综合方法,进行车身骨架轻量化的设计。     

逆向左转交叉口的全感应公交优先信号控制技术

逆向左转交叉口已在中国70余个城市实现常态化应用，各地却始终没有形成设置和运用配套交通控制设施的统一做法。当公交专用车道穿过逆向左转交叉口时，必须考虑如何实施公交优先信号控制。基于此，针对十字形逆向左转交叉口提出一种全感应公交优先信号控制技术，该技术对信号灯设置、信号相位设置、相位显示顺序选择和交通流数据采集提出具体要求。以消除逆向左转车道的交通安全风险、加快优先车辆的运行速度、减少机动车相位的绿灯浪费为目标，设计5组逻辑规则，构成信号控制算法，向优先车辆提供绿灯延长和绿灯早启服务，自动调整机动车相位的绿灯时长、预左转相位的红灯时长和绿灯时长。选取1个典型的十字形常规交叉口和1个十字形逆向左转交叉口作为试验对象，利用Vissim创建虚拟道路交通环境。在交通仿真试验中，通过D-最优设计生成1 000个高负荷交通需求场景，共进行3 000次仿真运行。研究结果表明：就应用全感应信号控制技术的交叉口而言，设置逆向左转车道会在统计学意义上显著影响交叉口性能，对于降低全体车辆平均延误有明显效果，对于降低优先车辆平均延误有一定效果；就逆向左转交叉口而言，将全感应信号控制技术升级成全感应公交优先信号控...