空气弹簧的使用要求及故障分析

空气弹簧因其良好的非线性特性在车辆上得到广泛的应用,但其在使用中却容易产生故障。本文介绍空气弹簧的使用要求,并分析空气弹簧故障产生的主要原因及防范措施。     

DF型机车燃油监测系统

车载燃油监测系统是一套对运用机车和非运用机车的燃油消耗进行精确监测的系统，现对车载燃油监测系统的功能、构造、技术要求及工作原理进行介绍。     

综合客运枢纽信息系统需求分析和框架体系研究

信息一体化是现代综合客运枢纽的基本特征之一,通过借鉴国外枢纽信息系统的发展经验,从旅客、管理者、运营主体等用户群角度,对我国综合客运枢纽信息系统的需求及功能进行分析,界定了枢纽信息系统与各交通方式信息系统的区别与联系,明确了枢纽信息系统作为"共享、协调、服务"(SCS)信息平台的内涵和定位,从而提出了枢纽信息系统"一个平台、两大应用、三个保障体系"的基本框架,并进一步给出了实施建议。     

车辆限速装置的技术要求及性能比较

介绍车辆限速装置的类型及其在车辆中的使用;阐述车辆限速标准要求,并通过对某客车分别进行发动机ECU指令控制的限速试验和机械式限速器控制的限速试验;对比分析两者的性能,并提出建议。     

适应客车用户特殊要求的电路设计

通过对不同地区、不同客户特殊要求的分析，设计了几种特殊电路，并详细地阐述了电路的设计思路与原理。     

AIS操作培训与发证探讨

国际海事组织发布了AIS船上应用导则(A.917(22)号决议案)及其培训标准,以及国际灯塔协会对VTS操作员培训标准评估指南。要求使用者必须熟悉AIS的性能和有关缺陷。鉴于此,讨论了培训和发证方法,为海事安全管理机构、船公司和海运院校提出了一些建议。     

封控作战中对目标火力打击炮兵需求分析

针对火力打击的目标种类,本文的炮兵需求分析是建立在定性和定量相结合的基础上,从微观的角度,主要对导弹阵地、机场、港口等目标类型进行分析计算,确定毁伤指标。依据计算程序并充分考虑封控作战的特点计算炮兵兵力需求量。     

航标维护管理工作和发展的设想

介绍海南省港航管理局航标维护管理工作与工作要求,对其存在的问题进行了分析,并提出了一些解决问题的设想.     

Electric vehicles: How much range is required for a day’s driving?

One full year of high-resolution driving data from 484 instrumented gasoline vehicles in the US is used to analyze daily driving patterns, and from those infer the range requirements of electric vehicles (EVs). We conservatively assume that EV drivers would not change their current gasoline-fueled driving patterns and that they would charge only once daily, typically at home overnight. Next, the market is segmented into those drivers for whom a limited-range vehicle would meet every day’s range need, and those who could meet their daily range need only if they make adaptations on some days. Adaptations, for example, could mean they have to either recharge during the day, borrow a liquid-fueled vehicle, or save some errands for the subsequent day. From this analysis, with the stated assumptions, we infer the potential market share for limited-range vehicles. For example, we find that 9% of the vehicles in the sample never exceeded 100 miles in one day, and 21% never exceeded 150 miles in one day. These drivers presumably could substitute a limited-range vehicle, like electric vehicles now on the market, for their current gasoline vehicle without any adaptation in their driving at all. For drivers who are willing to make adaptations on 2 days a year, the same 100 mile range EV would meet the needs of 17% of drivers, and if they are willing to adapt every other month (six times a year), it would work for 32% of drivers. Thus, it appears that even modest electric vehicles with today’s limited battery range, if marketed correctly to segments with appropriate driving behavior, comprise a large enough market for substantial vehicle sales. An additional analysis examines driving versus parking by time of day. On the average weekday at 5 pm, only 15% of the vehicles in the sample are on the road; at no time during the year are fewer than 75% of vehicles parked. Also, because the return trip home is widely spread in time, even if all cars plug in and begin charging immediately when they arrive home and park, the increased demand on the electric system is less problematic than prior analyses have suggested.     

薄膜型液化天然气船结构规范计算的比较和研究

基于某22万m3薄膜型液化天然气船,比较了ABS、DNV和LR船级社对薄膜型液化天然气船的结构规范异同点,着重讨论了液货舱周界的腐蚀厚度、规范计算等技术问题,并探讨了薄膜型液化天然气船在局部支撑构件尺寸统一要求方面的可行性。