An on-road evaluation of connected motorcycle crash warning interface with different motorcycle types

Crash warning systems have been deployed in the high-end vehicle market segment for some time and are trickling down to additional motor vehicle industry segments each year. The motorcycle segment, however, has no deployed crash warning system to date. With the active development of next generation crash warning systems based on connected vehicle technologies, this study explored possible interface designs for motorcycle crash warning systems and evaluated their rider acceptance and effectiveness in a connected vehicle context. Four prototype warning interface displays covering three warning mode alternatives (auditory, visual, and haptic) were designed and developed for motorcycles. They were tested on-road with three connected vehicle safety applications - intersection movement assist, forward collision warning, and lane departure warning - which were selected according to the most impactful crash types identified for motorcycles. Combined auditory and haptic displays showed considerable promise for implementation. Auditory display is easily implemented given the adoption rate of in-helmet auditory systems. Its weakness of presenting directional information in this study may be remedied by using simple speech or with the help of haptic design, which performed well at providing such information and was also found to be attractive to riders. The findings revealed both opportunities and challenges of visual displays for motorcycle crash warning systems. More importantly, differences among riders of three major motorcycle types (cruiser, sport, and touring) in terms of rider acceptance of a motorcycle crash warning system were revealed. Based on the results, recommendations were provided for an appropriate crash warning interface design for motorcycles and riders in a connected vehicle environment.     

广州南站(2×32+64+2×32)m双线V构连续梁设计

(2×32+64+2×32)m双线槽形V构连续梁是广州南站桥建合一结构体系中的轨道梁,是承载上部站房候车厅层(高程21 m层)的结构柱的受力构件和铁路运行的轨道梁(高程12 m层)及站台板梁横向支承的结构。着重介绍该V构连续梁(高程12 m层)与站房候车厅层(高程21 m层)及站台板梁的相互关联及受力状态、V构连续梁的结构构造、静力分析、局部分析、抗震分析等。最后对结构设计进行总结、提炼,为同类结构提供参考。     

二甲醚发动机缸内燃烧过程的三维数值模拟

通过扩展标准版KIVA-3V燃料库,使其具有液态DME燃烧过程的计算能力。用扩展程序对改装后的二甲醚发动机的缸内工作过程进行了三维数值模拟,得到了缸内气体流动、平均性能曲线及温度、压力场等大量实时数据信息。经过与原柴油机工作情况的对比分析表明:二甲醚作为发动机燃料可以减轻零部件负荷,降低噪音,减少排放。     

基于CATIA的车身后底板逆向设计

车身后底板因结构复杂、零部件多而成为白车身设计的难点,采用逆向工程方法对后底板进行了分析设计。针对逆向设计中后底板形状复杂、点云数量大、倒角、翻边及搭接等技术处理难点做了相应的优化,为产品的创新设计和缩短生产周期,以适应快速多变的市场需求提供了技术支持。通过三维建模软件对汽车后底板的逆向设计,完成了数据采集、预处理及三维模型的重建,并对逆向设计过程中遇到的问题做出合理的解答,为逆向工程方法在汽车车身设计的应用提供了参考。     

基于新架构的汽车远程诊断系统的应用

基于SOA(Service Oriented Architecture)新架构的汽车远程诊断系统,具有车云之间通讯的优势,使车辆具有灵活的功能选择性。本文旨在提出可以满足客户的多样化需求的、缩减整车厂车辆研发周期的汽车远程诊断系统,其具备车辆功能配置服务、体检服务以及快捷服务等功能,在提高用户满意度和体验感的同时,也可以简化整车厂同一车型子车型结构,降低相关工作量,提升整车厂工作效率。     

汽车电源电压标准提升的研究

随着电子、电器元件的发展,其在汽车上的应用日益广泛,以致汽车原有的电能供应出现了严重不足,提高汽车供电系统的电压,采用42V电压值,已成为一些国际论坛中的讨论热点。本文以陕汽牌SX2190越野车为例,并结合当前汽车行业的发展现状,对提高汽车供电系统电压进行研究。     

以液压马达驱动压缩机的空调制冷系统诊断

介绍以液压马达驱动压缩机的空调制冷系统的基本组成、特点和液压马达控制的基本过程,并通过K350SH60基律纳卡车的典型空调故障诊断实例,叙述此类空调故障的原因分析和诊断方法。     

基于E—NCAP行人碰撞保护的发动机罩设计

行人头部碰撞保护一直是汽车行人安全设计的难点,随着E—NCAP对行人保护要求的不断提高,头部保护的得分比重对于获得高星级评价至关重要。文章基于某车型E—NCAPV6．2五星性能开发,采用虚拟仿真与试验测试有效结合的方法,对发动机罩进行了优化设计,提出了一种有利于行人头部碰撞保护的发动机罩。改进前后测试成绩的对比分析表明,该结构可极大优化行人头部碰撞保护效果,使发动机罩头部测试区域得分总分提升至24．43分,满足E—NCAPV6．2五星行人保护性能要求。可为后续设计提供参考,具有很高的推广价值。     

车联网中移动边缘计算的网络架构

从车联网(V2X)的不同应用角度,讨论在不同应用场景下的移动边缘计算(MEC)组网方式,为车联网(V2X)的业务实现提供技术支持。     

离子束增强沉积TiN薄膜的耐蚀性

采用不同离子束入射方向的离子束增强沉积技术（IBED）在W18Cr4V高速钢表面沉积TiN薄膜.利用阳极极化曲线测试技术研究TiN薄膜在0.5mol/L H2SO4和3％ NaCl溶液中的耐蚀性.结果表明：在0.5mol/LH2SO4溶液中,离子束入射角度为45°时的TiN薄膜的阳极极化曲线呈现自钝化,自腐蚀电位Ecorr由原始高速钢的-400 mV增至-71 mV,致钝电流密度ib和维钝电流密度ip分别比原始试样降低4个和2个数量级,耐蚀性能显著提高.在3％ NaCl溶液中,离子束入射角度分别为0°、30°沉积的TiN薄膜的阳极极化曲线均呈现自钝化-点蚀击穿过程,随着入射角度的增加,自腐蚀电位和点蚀击穿电位升高,入射角度为45°时的TiN薄膜不发生点蚀破坏,自腐蚀电位Ecorr由原始高速钢的-600 mV增至-10 mV,具有高的抗点蚀性能.