智能交通系统的发展及其共用信息平台的建设

介绍了智能交通系统的7个主要子系统的功能实现和发展方向，以及共用信息平台的建立，它承载ITS的规划、管理控制和业务发展等功能，科学合理地指导ITS及其子系统的建设，最终形成交通信息化、智能化，有效地改造和提升交通运输传统产业。     

机车—桁架桥梁耦合振动研究

建立了轮对和钢轨之间弹性联接３３个自由度的机车车辆动力学模型，采用有限元法分析计算了列车荷载作用下某铁路双线钢桁桥的动力响应。采用空间梁单元建立了桁架桥的振动方程。根据随机振动理论计算了当列车过桥时，车－桥耦合振动系统的空间动力响应，并与实测结果进行了比较，比较表明，采用弹性联接横型比密贴模型的计算结果更接近于实测值。     

线性定常系统的一种容错控制新方法

当控制系统的参数发生跳变故障时，系统的性能往往会恶化，甚至会引起系统不稳定。本文讨论了当线性定常系统出现参数跳变故障时的一种容错控制方法。故障检测采用神经网络实现，而容错控制器则采用控制器重构方式设计。仿真结果表明该方法是有效的。     

Establishing and Managing Jurisdiction-wide Traffic Monitoring Systems: North American Experiences

With the rapid motorization process in China, an increasingly complicated highway transportation system has been developed. Reliable national and provincial traffic monitoring systems are becoming necessary. A review of experiences from developed countries in North America can be helpful for highway administrations and agencies to design and implement effective and efficient traffic monitoring systems. Highway agencies in North America have over time developed “standard” traffic monitoring systems based on guidelines from the Federal Highway Administration (FHWA), the American Association of State Highway and Transportation Officials (AASHTO), and the American Society for Testing and Materials (ASTM). The common practices are adopted based on the analysis of system accuracy, reliability, and cost-effectiveness. The common practices can produce equivalent and comparable traffic summary statistics, which are able to support sensible decision-makings of all aspects of highway transportation. The experiences of highway agencies, current practices, and related guidelines in North America are therefore presented at first. The principles for guiding development and operation of traffic data programs are then summarized and reviewed. The existing problems and active research for traffic monitoring practices and standards are also identified and discussed. It is believed that the reviewed experiences, guidelines, and principles will be helpful for China to establish effective and common-practice based “standard” traffic monitoring systems.     

一种基于车辆跟踪的微观交通参数采集方法

微观交通参数采集是智能交通中的重要技术。本文用基于车辆跟踪的方法提取微观交通参数，首先，利用动态图像处理技术进行车辆跟踪；然后，建立适于交通参数采集的摄像机模型：在此基础上，提出了基于车辆跟踪的车辆位置检测算法，瞬时速度估计算法，并阐述了其它交通参数采集方法，试验表明，这些方法可以有效的提取交通参数，实施方便。     

正面碰撞用HIII 50百分位男性假人颈部标定系统的研究

介绍了汽车正面碰撞过程中所用到的HybridIII50％男性假人及其标定原理,着重介绍其颈部标定试验设备、试验步骤、试验结果及分析,并给出相应问题的解决方案,最终阐明颈部标定的必要性。     

Study of Probe Sample Size Model in Probe Vehicle Technology

In this paper, market penetration of a probe vehicle for real-time traffic data collection is discussed. A new comprehensive probe sample size model that satisfies the need of traffic flow parameter estimation and traffic network coverage is established, in which many factors like location error, probe ‘report’ transmission interval, probe data analysis interval, traffic flow density, link length, and road type are included. Based on this model, this paper proves the relationship between market penetration of the probe vehicle and other indexes, when probe data is used for link average speed estimation based on VISSIM simulation. The simulation result shows that the sample size model can provide effective probe information to accomplish the estimation of link speed.     

面向I TS共用信息平台的数据融合研究

信息融合系统通过关联系统的信息整合,为ITS共用信息平台的各种功能提供信息支撑.基于对ITS共用信息平台中数据的特点,数据预处理的分析,结合数据融合的级别,提出一种新的面向ITS共用信息平台的数据融合方法和技术,来满足智能交通各子系统的不同的数据需求.这种方法在技术上是可行的,具有一定的实用性和广泛的应用价值.     

连续箱梁跨中合龙段箱梁顶板纵向裂缝分析研究

针对某桥预应力混凝土连续箱梁中跨合龙段顶板出现的纵向裂缝,根据现场检查资料并采用空间有限元分析方法进行了研究。研究结果表明,产生混凝土顶板纵向裂缝的主要原因是设计上对箱梁温度梯度和车辆轮载作用考虑不足,导致箱梁顶板产生的混凝土横向正应力超过其抗拉标准强所致。     

关于我国交通仿真技术发展战略的思考

在综合分析世界范围内交通仿真模型与技术发展现状和阶段的基础上,剖析未来交通仿真技术的发展趋势。通过借鉴我国目前交通仿真模型的技术水平并结合我国国情,提出了未来我国交通仿真技术创新的重要战略领域,分别覆盖新技术应用、模型构建和平台研发3个层面,针对每个领域提出了共计9大发展重点。