Will autonomous vehicles change residential location and vehicle ownership? Glimpses from Georgia

Many studies have begun investigating possible transportation landscapes in the autonomous vehicle (AV) era, but empirical results on longer-term decisions are limited. We address this gap using data collected from a survey designed and implemented for Georgia residents in 2017–2018. Focusing on a hypothetical all-AV future, this section of the survey included questions regarding advantages/disadvantages of AVs, short-term mode choice impacts, medium-term impacts on activity patterns, and long-term behavioral changes – specifically, whether/how AVs will influence individuals to change residential location and the number of cars in the household. We hypothesize that AVs could act in concert with attitudinal preferences to stimulate changes in these long-term decisions, and that some medium-term activity changes triggered by AVs could motivate people to relocate their residence or shed household vehicles. We applied exploratory factor analysis to measure the perceived likelihood that AVs would prompt various medium-term changes. We then included some of those measures, among other variables, in a cross-nested logit (CNL) model of the choice of the residential location/vehicle ownership bundle. Although more than half of respondents expected “no change” in their bundle, we found that younger, lower income, pro-suburban, and pro-non-car-mode individuals were more likely to anticipate changing their selections. In addition, some expected medium-term impacts of AVs influenced changes in these longer-term choices. We further applied the CNL model to two population segments (Atlanta and non-Atlanta-region residents). We found notable improvement in goodness of fit and different effects of factors across segments, signifying the existence of geography-related taste heterogeneity.     

HC9S12单片机在混合动力汽车ISG控制系统中的应用

基于MC68HC9S12DP256B单片机,研制了混合动力汽车(HEV)集成化动力总成(ISG)控制系统,提出了软硬件设计、电机和动力电池的模糊控制和动力总成的控制策略。     

世界车辆法规协调论坛及其管理协定

主要对联合国欧洲经济委员会(UN/ECE)内陆运输委员会(ITC)框架下世界车辆法规协调论坛及其下属的6个工作组,以及所管理的三项协定:1958年协定(车辆结构法规)、1998年协定(全球技术法规)和1997年协定(定期技术检查)等进行论述。     

Driver models in automobile dynamics application

Understanding the driver of an automobile has been attractive to researchers from many different disciplines for more than half a century. On the basis of their acquirements, models of the (human) driver have been developed to better understand, analyse and improve the combined couple of driver and automobile. Due to distinctive demands on the models in accordance with different kinds of applications, a variety of driver models is available. An overview of driver models is given with respect to their application and different methodical modelling approaches. The emphasis is put on the interest of engineers, who generally focus on the automobile (like design and optimization of vehicle components and the overall vehicle dynamics behaviour) by applying their approved (mathematical) methods. Nonetheless, a brief look beyond is added to better complete the view on the involved task of driving and driver modelling for automobile dynamics application.     

一车一档系统在客车技术履历管理中的应用

随着客车技术的迅猛发展,原有的卡片式客车技术履历已经不能适应生产的需要,针对这一要求,结合多年的工作实践,利用中文Visual Foxpr06.0技术,编写一车一档这套数据库管理软件,利用电脑来管理客车履历,实现客车技术履历的电子化,本系统也可以将字段名进行改编,在其他系统中使用.     

基于Verilog HDL的多功能车辆总线编码器设计

讨论多功能车辆总线MVB以及目前国内外MVB网络产品的开发情况,阐述IP核的基本特征及其在SOPC设计中的重要性.在此基础上,设计MVB Encoder模块的总体方案,采用Veriiog硬件描述语言在QUARTUS Ⅱ 6.0上实现其IP核的设计,通过Modelsim SE 6.2 b仿真平台对MVB主帧进行仿真验证.仿真结果表明设计的正确性,可为MVB网络产品的开发提供一种有效的实现方法.     

太原地铁1号线重大工程技术问题研究

太原地铁1号线对于太原市后续轨道交通建设项目具有示范和引导作用,因此需要慎重确定建设标准和工程技术方案。结合工程实际情况,采用对比分析、模拟计算等方法,对于1号线车辆选型和编组方案、长大陡坡地段的列车运行安全性及运行速度、太原站至南内环东街段线路走向及车站分布方案等几个重大工程技术问题进行分析研究,为项目提供专业、科学的决策依据,对于推动太原市城市轨道交通可持续发展具有重要作用。     

载人潜水器观察窗研究综述

为解决载人潜水器观察窗的变形协调和疲劳寿命预测等技术难题,对观察窗的材料、失效模式、结构形式、安装和密封以及载荷谱进行了详细论述,并综述了国内外的研究现状。国外学者从上世纪中期从事这方面的研究且已取得很大进展,我国随着\"蛟龙\"号成功研制,也开始进行观察窗的理论和试验研究。丙烯酸塑料蠕变机理,疲劳寿命预测、裂纹扩展研究以及寻找新材料将成为未来主要的研究方向。     

自动进路原理中提前开放距离的最优化分析

分析了提前开放距离对自动进路以及运营效率的影响,以CBTC制式为基础,本着运营效率最大化的原则,综合考虑传输延时、道岔转动时间、制动延时影响因素,详细阐述了提前开放距离的最优测算原则,最后对提前开放距离在轨道电路制式下的最优化应用进行了介绍。