Methodology for kinematic cycle characterization of vehicles with fixed routes in urban areas

This paper analyses the driving cycles of a fleet of vehicles with predetermined urban itineraries. Most driving cycles developed for such type of vehicles do not properly address variability among itineraries. Here we develop a polygonal driving cycle that assesses each group of related routes, based on microscopic parameters. It measures the kinematic cycles of the routes traveled by the vehicle fleet, segments cycles into micro-cycles, and characterizes their properties, groups them into clusters with homogeneous kinematic characteristics within their specific micro-cycles, and constructs a standard cycle for each cluster. The process is used to study public bus operations in Madrid.     

拱北隧道管幕-暗挖法工作井设计关键技术

港珠澳大桥拱北隧道需下穿拱北口岸,由于工程建设不能影响口岸正常通关,隧道口岸段采用了管幕-暗挖法,冻结管幕间土体进行止水的方案实施。隧道施工最大影响宽度22.24 m,高度23.84 m,与工法配套的类似规模工作井未有先例。从如何设计合适的工作井着手,研究工作井设计的关键技术问题。通过综合分析工程建设条件、隧道施工工艺、运营管理需求等,找出工作井设计的关键点。采用多因素交叉耦合法选址、改进群管工作井限界计算公式、明挖顶管工作井实施方案、全寿命周期结构设计等方法对问题逐一解决。工作井在投入使用后达到了预期效果,工程实践证明,此类工作井设计的关键点是工程选址、限界拟定、实施方案选择、结构设计。     

京新高速公路韩集段东夭隧道设计要点探讨

东夭隧道是京新高速公路重要的控制性工程。文章阐述了该隧道明暗洞结构设计、洞身防排水设计及通风斜井结构设计等关键环节,为内蒙古自治区特长隧道的设计提供一定的参考。     

某汽车起重机用13T级驱动桥壳强度分析

本文以Altair Hyperworks 9.0软件为工具,以及传统理论计算结果,对某型起重机驱动桥壳强度进行对比分析。结果表明,驱动桥壳强度满足要求,验证了驱动桥壳设计的合理性,为其它起重机用驱动桥壳的设计提供了理论依据。     

Risk assessment based on driving behavior for preventing collisions with pedestrians when making across-traffic turns at intersections

Traffic accident statistics in Japan show the necessity of preventing vehicle-on-pedestrian accidents. If the risk of a vehicle colliding with pedestrians could be evaluated in advance, driver-assistance systems would be able to support drivers to avoid potential collisions. Here, features of driving behavior and methods for assessing the risk of collision were investigated for a right turn at an intersection in left-hand traffic, which is a typical vehicle-on-pedestrian accident scenario. The results showed that pedestrian-collision risk can be evaluated from how the driver slows the vehicle and where the driver looks while turning during the maneuver. Moreover, pedestrian-collision risk could be predicted based on driving behavior upon commencement of steering when making an across-traffic turn.     

计轴自动站间闭塞电路方案探讨

根据TB／T2668—2004《铁路自动站间闭塞技术条件》所提出的要求，以奎北线、乌准线为例，介绍了计轴自动站间闭塞电路的构成和应用。     

城市地铁竖井施工涌水涌砂处理

介绍了城市轨道交通区间竖井施工穿越沙层段时遇到涌水流砂时的治理方案,总结了综合治理的方法和经验,为今后竖井施工提供了宝贵经验。     

行车液压取力交流发电系统可行性研究

本文对行车液压取力交流发电系统的可行性进行了分析,并结合实例进行了验证。     

电动乘用车的能量密度及续驶里程

总结《免征车辆购置税的新能源汽车车型目录》(第一批到二十九批)中的电动乘用车相关数据,重点分析近6年电动乘用车的电池能量密度、整车能量密度及续驶里程的变化,通过梳理分析,总结其规律及变化趋势。     

钢轨打磨列车分动箱传动轴电子束焊接工艺研究

针对钢轨打磨列车分动箱传动轴内花键加工困难的难题，提出剖分一插齿一电子束焊接的加工方案。设计了剖分式结构，并研究电子束焊接工艺。采用优化工艺，成功焊接了传动轴。