机车用自锁型气密砂箱盖的设计

介绍一种新式的砂箱盖,带有自锁机构,开启方便;其外表基本为平面,对气体具有密封性,可以满足压缩空气喷砂的要求。     

基于数据驱动的隧道地质信息精细化管理系统研发与应用

针对现阶段隧道超前地质预报系统管理粗放、数据利用率低等问题，结合数据驱动原理重塑业务逻辑，研发新的隧道地质信息系统TGIS。通过高度集成隧道勘察设计阶段地质、施工阶段超前预报地质及掌子面开挖揭示地质，实现基于数据驱动的预报方法优选、临近预报提醒、分级实时预警与有效处置、掌子面自动素描、预报成果辅助判识等功能，达到隧道地质信息精细化管理的目的。经现场使用表明： 基于数据驱动的隧道地质信息精细化管理系统界面友好、运行稳定、效果良好，各项功能达到设计要求，相对于传统超前地质预报系统具有明显的优势，可普遍服务于隧道建设。     

Multivariable speed synchronisation for a parallel hybrid electric vehicle drivetrain

In this article, a new drivetrain configuration of a parallel hybrid electric vehicle is considered and a novel model-based control design strategy is given. In particular, the control design covers the speed synchronisation task during a restart of the internal combustion engine. The proposed multivariable synchronisation strategy is based on feedforward and decoupled feedback controllers. The performance and the robustness properties of the closed-loop system are illustrated by nonlinear simulation results.     

船舶机舱电动往复机械的维护特点

通过对船舶机舱最常见的3种电动往复机械进行分析,得出电动往复机械维护管理的主要特点,并进一步弄清了3种电动往复机械的结构特点与工作原理。比较3种电动往复机械的维护特点,不仅对船舶机舱设备的日常维护管理起到一定的促进作用,还可以在一定程度上提高轮机管理人员的专业知识。     

Strategies to achieve deep reductions in metropolitan transportation GHG emissions: the case of Philadelphia

ABSTRACT

This paper investigates strategies that could achieve an 80% reduction in transportation emissions from current levels by 2050 in the City of Philadelphia. The baseline daily lifecycle emissions generated by road transportation in the Greater Philadelphia Region in 2012 were quantified using trip information from the 2012 Household Travel Survey (HTS). Emissions were projected to the year 2050 accounting for population growth and trends in vehicle technology for both the Greater Philadelphia Region and the City of Philadelphia. The impacts of vehicle technology and shifts in travel modes on greenhouse gas (GHG) emissions in 2050 were quantified using a scenario approach. The analysis of 12 different scenarios suggests that 80% reduction in emissions is technically feasible through a combination of active transportation, cleaner fuels for public transit vehicles, and a significant market penetration of battery-electric vehicles. The additional electricity demand associated with greater use of electric vehicles could amount to 10.8 TWh/year. The use of plug-in hybrid electric vehicles (PHEV) shows promising results due to high reductions in GHG emissions at a potentially manageable cost.     

About the possibilities of using the renewable energy power sources on railway transport

Several electrification systems based on renewable energy power sources (first of all, solar energy) are discussed in respect to their applicability to railway transport and, in particular, to suburban electric trains. Two systems are considered with basic technical details and economic estimation, both including the onboard bank of batteries and the photovoltaic converters (PVC) of solar energy for compensation of energy expenses, which could be positioned either on stations or on wagon's roofs. Sun‐tracking systems and their effect on the solar energy conversion efficiency are discussed in application to stationary and moving PVC platforms. An analysis made shows that introduction of the “green” systems discussed will not only have positive ecological impact, but also can bring a notable economical effect even with today's components, while it could be considerably greater with the usage of new PVCs, which are being developed by the authors. Copyright © 2011 John Wiley & Sons, Ltd.     

炭纤维复合叠层铝板的制备工艺和实验研究

综合评论了从ＡＲＡＬＬ发展到新一代复合叠层铝合金板的进展。实验研究了新一代的叠层铝板－－炭纤维复合叠层铝板的制备工艺，并提供了所制备的炭纤维复合叠层铝板的性能。结果表明：这种铝板具有ＡＲＡＬＬ板的各种优点，能改进ＡＲＡＬＬ的一些缺点，它的各种性能指标皆优于铝合金板，因此可望取代高强度铝合金板而广泛应用于各类工程项目之中。     

ALA转子磁阻同步电动机的开环运行特性

研制了一台高凸极比的两极ＡＬＡ转子磁阻同步电动机，实验研究了电机的开环运行特性，研究结果表明电机开环运行时存在一个比较严重的低频振荡，这个振荡发生在电机电源频率略大于电机的自然频后的谋一频段，且会导致电机失去同步。     

Fault classification method for the driving safety of electrified vehicles

A fault classification method is proposed which has been applied to an electric vehicle. Potential faults in the different subsystems that can affect the vehicle directional stability were collected in a failure mode and effect analysis. Similar driveline faults were grouped together if they resembled each other with respect to their influence on the vehicle dynamic behaviour. The faults were physically modelled in a simulation environment before they were induced in a detailed vehicle model under normal driving conditions. A special focus was placed on faults in the driveline of electric vehicles employing in-wheel motors of the permanent magnet type. Several failures caused by mechanical and other faults were analysed as well. The fault classification method consists of a controllability ranking developed according to the functional safety standard ISO 26262. The controllability of a fault was determined with three parameters covering the influence of the longitudinal, lateral and yaw motion of the vehicle. The simulation results were analysed and the faults were classified according to their controllability using the proposed method. It was shown that the controllability decreased specifically with increasing lateral acceleration and increasing speed. The results for the electric driveline faults show that this trend cannot be generalised for all the faults, as the controllability deteriorated for some faults during manoeuvres with low lateral acceleration and low speed. The proposed method is generic and can be applied to various other types of road vehicles and faults.     

在出口机车上由JZ-7型制动机替代26-L型制动机的可行性探讨

从JZ-7型制动机和26-L型制动机的结构、性能、操作方式以及附加功能等方面进行了对比,在结构、性能和操作方式上两种制动机基本相同;26-L制动机具有的安全控制和自动停车功能,JZ-7制动机通过简单改造后即可实现,在与用户沟通后由JZ-7型制动机替代26-L型制动机在出口机车上运用是可行的。