对于商用车加速噪声试验新方法中发动机转速的处理意见

通过对商用车加速行驶车外噪声验证试验结果的分析发现,欧洲经济委员会颁布的ECE R51/03系列汽车加速行驶车外噪声法规缺少对于试验过程中商用车发动机转速特性的全面考虑。为此,结合GB 1495—2002中对类似情况的处理方式,以及ECE R51/03系列法规的制订宗旨,提出了针对发动机转速对应条款修订意见,并对条款修订前、后的试验数据进行了对比。     

管线综合工程设计工作总结

该文对两个较复杂的管线综合工程通过比较,作出结论,可供相关专业人员参考。     

重型车辆液力变矩器闭解锁控制技术的试验研究

将美国Allison公司的大功率HD4070PR 7挡自动变速器装在北方奔驰2627K自卸车改装车上进行道路试验,对其液力变矩器的闭解锁规律和控制策略进行了研究,为重型车辆液力变矩器的闭解锁控制研究提供技术支持.     

Field operational tests of Smartway in Japan

Efforts are underway in Japan to promote “Smartway” next-generation roadways, which provide a variety of services through the use of advanced ITS technologies. In recent years, the National Institute for Land and Infrastructure Management (NILIM), part of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), has conducted public-private joint research on next-generation road services using ITS technologies. Field operational tests (FOTs) of services including forward obstacle information provision and merging assistance using 5.8 GHz dedicated short range communication (DSRC) were conducted on the Tokyo Metropolitan Expressway through FY2007. In FY2008-2009, FOTs were conducted in three major metropolitan areas—Tokyo, Nagoya, and Keihanshin (Kyoto, Osaka, and Kobe)—to promote future deployment nationwide. These included tests of information provision services to alert drivers to forward obstacles hidden beyond the crest of an incline and prevent excessive speed on sharp curves. This paper presents an overview of these FOTs conducted by NILIM in recent years and their results.     

FRP筋预应力混凝土梁计算方法探讨

文中基于等效荷载法和FRP筋与混凝土协作关系的分析法对FRP预应力筋混凝土梁进行分析,并与试验值进行比较,探讨FRP筋预应力混凝土构件的计算方法,为设计计算提出建议。     

旧城区停车问题研究及解决思路

虽然近年来停车设施建设取得较快发展,但与日益增长的停车需求相比,停车设施建设速度仍显滞后。分析了现状停车存在的问题,主要为机动车发展与停车设施供给之间的矛盾,且停车管理方面也存在改善空间。针对以上问题提出了相关解决思路,包括停车规划、建设、管理一体化,采用区域差异化的停车供给模式,扩大停车供给与提高停车利用率相结合,以及停车设施建设的机械化和信息化。     

先入后出型城市快速路匝道组合的最佳间距

以上海市某先入后出型匝道组合为例,利用校验后的仿真软件TSIS研究了匝道间距与交织区平均速度的变化关系.结果表明,随着匝道间距的增加,交织区平均速度呈先增加后趋于稳定的趋势,且匝道间距对主线最外侧车道的影响程度远远高于对内侧车道的影响.借助统计软件SPSS分析了主线设计速度分别为60、80、100 km/h时匝道间距、流量、汇入比、分流比与交织区平均速度的关系并建立了相应的定量模型.结果表明,主线设计速度不同时,影响交织区平均速度的因素也有所变化.根据定量模型分别计算了不同设计速度和交织区平均速度条件下的匝道间距,并根据实际情况对计算值进行了修正,最终给出了合理的推荐值,并与《城市快速路设计规程》(CJJ129-2009)中的推荐值进行了对比.结果表明,定量统计模型计算值较为合理,且更加详细,便于工程应用.     

隧道洞口雪崩防治方案探讨

雪崩是高原高寒地区工程建设的主要自然地质灾害之一,也是影响铁路隧道工程建设和运营的重要因素之一。为了制定合理的雪崩防治方案,通过对隧址区域自然地理条件现场进行调查分析,确定隧道两端洞门上方潜在的雪崩发生区域。采用tan α参数作图法对雪崩扩散距离及雪崩对洞门的冲击力进计算分析,提出在主隧道进口设置25 m明洞、洞门顶部设置导雪墙、出口设置5 m明洞、安全隧道进口设置15 m明洞的雪崩防治方案。方案能有效防止雪崩灾害对铁路隧道的威胁,保证铁路隧道冬季运营安全。     

Trends in vehicle motion control for automated driving on public roads

ABSTRACT

In this paper, we describe how vehicle systems and the vehicle motion control are affected by automated driving on public roads. We describe the redundancy needed for a road vehicle to meet certain safety goals. The concept of system safety as well as system solutions to fault tolerant actuation of steering and braking and the associated fault tolerant power supply is described. Notably restriction of the operational domain in case of reduced capability of the driving automation system is discussed. Further we consider path tracking, state estimation of vehicle motion control required for automated driving as well as an example of a minimum risk manoeuver and redundant steering by means of differential braking. The steering by differential braking could offer heterogeneous or dissimilar redundancy that complements the redundancy of described fault tolerant steering systems for driving automation equipped vehicles. Finally, the important topic of verification of driving automation systems is addressed.     

长距离掘进软弱围岩的TBM刀盘扩挖技术

为解决全断面岩石隧道掘进机（TBM）在软弱围岩地层的适应性问题,应对由于围岩收敛变形导致的卡机和支护被破坏的风险,基于高黎贡山隧道TBM施工项目,从TBM装备角度提出了针对性设计方案。通过对比现有的TBM刀盘扩挖技术,提出边缘滚刀外移和预留扩挖刀箱组合设计方案,并结合一套同步抬升油缸系统和中间导向柱实现了刀盘的抬升扩挖设计。通过上述研究,使刀盘半径方向扩挖量达到100 mm,避免由于隧道底部扩挖导致的主机“栽头”现象,实现TBM在软弱围岩地质条件的长距离扩挖掘进。