Real-time automatic rescheduling strategy for an urban rail line by integrating the information of fault handling

In the operation of urban rails, faults are inevitable, which leads to deviation between the actual timetable and the planned timetable. In nowadays, timetable rescheduling strategies rarely integrate the information of fault handling. In this paper, we develop a real-time automatic rescheduling strategy, which integrates the dynamic information of fault handling. The rescheduled timetable is obtained by a mathematical optimization model, the constraints set of which is automatically generated and adjusted as more information of fault handling is feedback. Compared with the experience-based rescheduling methods, the automatic rescheduling strategy reacts more quickly, and uses the information of fault handling more efficiently. A simulation system for testing the automatic rescheduling strategy is built, which uses the data of the Beijing Yizhuang metro line. Via testing on the simulation system, the effectiveness and efficiency of the automatic rescheduling strategy are validated.     

公路运输对经济发展的影响分析

结合公路运输的基本特性,以及公路设施对人们生活出行的重要性,详细阐述公路运输对经济发展的影响。公路运输系统的发展,不仅会大大促进国民经济的发展,而且对人民生活水平的提高和社会的全面进步,都有着巨大的推动作用和重要的现实意义。     

预应力混凝土梁式桥支座病害与防治

支座作为桥梁结构的重要构件,发挥着承重、抗震、抗击水平荷载、辅助梁体正常工作等的重要作用,其质量和性能直接影响桥梁的使用寿命.普通橡胶支座良好的耐久性、安装简易性、与稳定性能,以及"低廉"的价格,使之成为桥梁支座的首选构件.普通板式支座在预应力混凝土梁式桥(简支、连续、刚构)用得较多,支座病害也较多.由于人们对此病害的认识的深度不足,导致了很多梁式桥支座在投入运营前就处于带病状态,桥梁过早进入维修周期.现通过多年对梁式桥出现的支座病害情况的调研,总结分析了支座病害的成因、病害对桥梁整体寿命的影响;对工程常用的、数量较多的普通板式支座五种病害类型的危害特点进行论述;提出了有针对性防治措施;同时针对现浇梁式桥危害最大的支座剪裂病害提出两种解决方法,通过在兴延高速公路六环路立交的成功应用,为解决支座剪裂病害提供了借鉴.     

Expanding scope of hybrid choice models allowing for mixture of social influences and latent attitudes: Application to intended purchase of electric cars

Recently, policy makers’ expectations about the role of electric cars in reducing emissions have risen substantially. In parallel, academic research on purchase intentions has dramatically increased. Originally, most studies have focused on utility attributes and price. More recently, several hybrid choice models have been estimated to include the impact of attitudes on choice probabilities. In addition, a few studies have caught the attention to social influence. In contributing to this line of research, this paper reports the results of an expanded hybrid choice, which simultaneously estimated all these different effects in a single integrated model of purchase intention. Results indicate that the model performs well. Costs considerations contribute most to the utility of electric cars. Social influence is less important, but there is also evidence that people tend to take it into consideration when there are positive public opinions about electric cars and the market share becomes almost half of friends of their social network. The intention to purchase an electric car is also influenced by attitudes about environmental concerns and technology acceptance.     

新建客运专线接入既有客运专线信号改造施工调试技术

主要阐述新建客运专线接入既有客运专线引起既有客运专线信号工程改造的施工方案、方法和调试技术。     

京津城际与津秦客运专线互联互通探讨

针对津秦客运专线联调联试期间,不同型号的动车组运行跨线试验时发现天津站城际场与津秦场场联CTCS-2级互联互通问题,通过数据分析与比对提出修改方案,并现场进行试验,取得预期的效果,保证京津城际与津秦客运专线的跨线运行,为其他客专线路的互联互通解决方案提供借鉴。     

石济客运专线预应力混凝土槽形梁设计研究

在铁路车站附近,为了减少两端线路路堤高度,降低工程投资,同时能够满足跨越的立交道路及河流防洪要求,可以采用建筑结构较低的下承式桥槽形梁结构形式。以新建石家庄至济南铁路客运专线工程跨越禹王路的工点槽形梁结构为背景,通过有限元软件进行结构分析计算和设计优化,介绍双线铁路槽形梁结构的设计研究分析以及对槽形梁的空间结构计算、空间动力特性及车线桥耦合动力分析,综合考虑槽形梁弯剪扭综合效应以及箱形边主梁截面的空间变形。目前槽形连续梁在高速铁路工程中的应用均较少,缺乏具体的经验和理论公式,解决此技术难题为类似桥梁设计工作提供重要参考。     

汽车车轮加速疲劳试验的研究

以累积损伤理论为基础，对汽车车轮加速疲劳试验进行了研究，以缩短试验时间，降低试验成本。     

某越野汽车制动管断裂原因探究

针对某越野车制动管经常断裂的故障，采用自功率谱密度、模态试验和数据统计方法，分析了影响制动管断裂的主要因素。认为从分动箱到前桥传动轴二阶振动是引起制动管断裂的关键因素。针对该因素介绍和讨论了几个有效的、快速和实用的解决方案：将前桥不等速十字轴式刚性万向节，更换为球笼式等速万向节；将与制动卡钳相连的制动钢管更换为一小段低膨胀、耐高压的软管。针对制动管断裂的原因，改变该车在石块路上进行可靠性试验考核制动管的试验规范，用高速行驶试验来考核制动管的可靠性。     

客车底盘纵梁数控冲孔生产线

简要介绍客车底盘纵梁数控冲孔生产线的发展历史与现状；着重介绍SPU12—32-4型汽车U型纵梁三面数控冲孔生产线和SPTB120—10型纵梁数控平板冲孔生产线的特点。