Life cycle costing of diesel,natural gas,hybrid and hydrogen fuel cell bus systems: An Australian case study

The transit authority in Perth, Western Australia, has put several alternative fuel buses, including diesel-electric hybrid and hydrogen fuel cell buses, into revenue service over the years alongside conventional diesel and natural gas buses. Primary data from this fleet is used to construct a Life Cycle Cost (LCC) model, providing an empirical LCC result. The model is then used to forecast possible scenarios using cost estimates for next generation technologies. The methodology follows the Australian/New Zealand Standard for Life Cycle Costing, AS/NZS 4536:1999. The model outputs a dollar value in real terms that represents the LCC of each bus transportation technology. The study finds that Diesel buses deliver the lowest Total Cost of Ownership (TCO). The diesel-electric hybrid bus was found to have a TCO that is about 10% higher than conventional diesel. The premium to implement and operate a hydrogen bus, even if industry targets are attained, is still substantially greater than the TCO of a conventional diesel bus, unless a very large increase in the diesel fuel price occurs. However, the hybrid and hydrogen technologies are still very young in comparison to diesel and economies of scale are yet to be realised.     

新型数控冲床母线槽机电一体化生产系统研究

文章结合母线槽专用数控冲床的原理及结构,介绍了冲床的开放式数控系统结构,以及系统硬件构成,依据生产系统控制需求,利用模块化的设计思想,进行了系统功能模块的设计,重点介绍了数控冲床的控制部分,以及为母线槽生产研究、开发型材输送系统,通过该生产系统的研究为生产自动化的实现起到了一定的积极作用。     

基于串口PLC的CAN总线协议信息传输的设计与实现

介绍了通过一种转换器CAN232MB,建立串口PLC与计算机进行CAN总线信息传输的设计与实现。     

Integration framework for simulations and SCADA systems

Stricter requirements on the quality of industrial plant operation together with environmental limits and decreasing energy consumption bring more complex automation systems. The intelligent control techniques, which are based on approaches from diverse disciplines including statistics, artificial intelligence or signal processing, have been widely used during the last years and their benefits have been proved. They cannot be developed and tested without simulation models and access to online and historical data. This article proposes a platform for the integration of simulations and industrial SCADA systems supporting complex data access and simulation code re-use.The idea of the presented framework is to connect simulations, data sources, optimizers, other calculations and SCADA systems into one integrated environment seamlessly. A technical level of the framework provides integration of stakeholders and a semantic level captures engineering knowledge in inter-mapped ontologies and configures the technical level, which is often called model-driven configuration. The semantic level utilizes a formal model implemented as set of ontologies. The major contribution of the article are the layered model of the integration architecture and formulation of the integration requirements in the industrial automation domain. The proposed solution has been implemented and tested on a software prototype level. It is demonstrated on two use-cases covering both design and integration of simulation models from the industrial perspective. The proposed architecture is intended to be as general as possible, however it has been tested on signal-oriented simulators only. It is the main limitation of this contribution and it should be addressed in upcoming work.     

基于CAN总线的油液在线分析检测系统设计

针对目前油液分析检测技术大多不能实现实时在线检测的现状,利用CAN总线的特点,提出一种基于CAN总线的油液在线分析检测系统,详细介绍系统方案和原理,重点阐述油液监测装置的设计和CAN总线节点的软硬件实现。     

飞机柔性装配集成控制技术研究

柔性装配技术是现代飞机装配的发展方向.通过集成控制技术的研究,实现飞机柔性装配中的各个子系统的集成,对实现飞机装配自动化、提高装配效率和质量有重要意义.本文提出基于以太网和CAN现场总线的集成控制系统设计方案,为飞机柔性装配集成控制系统的设计提供了一种可行的方法.     

数控系统现场总线精确时钟同步技术

结合自主开发的现场总线NCUC-bus协议,对与加工精度密切相关的现场总线时间同步技术进行了研究,并通过与现场总线上广泛实施的IEEE 1588精确时间同步协议的对比分析,论证了文章提出的同步策略的可行性和实用性.利用自行研制的主从站单元组建了实验系统,完成了时间同步精度的测试.实验结果表明,采用了NCUC-bus现场总线时间同步精度小于100ns,能够很好地满足现场工业控制的要求.     

高稳定性低功耗的车用LIN总线智能终端设计

随着越来越多电子设备应用到汽车中,总线连接的方式是大势所趋.在不需要CAN总线的带宽和多功能的场合,使用LIN总线可大大节省成本.详细地论述高稳定性、低功耗并且低成本的车用LIN总线智能终端的设计.针对网络传感器LIN总线终端的稳定性问题,研究智能终端的构成及传感器、微控制器和LIN总线收发器的连接方式,以及保证智能终端的高稳定性的技术关键、进一步降低功耗以及控制该智能终端的措施和方法.     

Plug-in单轴并联式混合动力城市公交控制策略研究

在人类面对能源危机与环境污染双重压力的今天,混合动力电动汽车因其集合了传统汽车续驶里程长和电动汽车低排放的优点,很好地缓解了人类的危机.混合动力电动汽车的节油能力以及排放性能主要取决于它的类型和整车的控制策略.文中主要是介绍一种Plug-in单轴并联式混合动力城市公交的控制策略.     

利用LabVIEW的海底采矿车行走控制系统研究

针对海底采矿车在海底难以实现自动行走控制的难题,以海底采矿车模型机为控制对象,基于CAN总线通信方式,设计适用于海底采矿的行走控制系统方案.以M公司的CompactRIO控制器为核心,开发行走控制系统的硬件系统.借助LabVIEW图形化编程环境,开发行走控制系统程序,实现海底采矿车在行走过程中数据采集、控制、监测、显示和分析等功能.模型机行走实验表明,所开发的行走控制系统能有效地实现采矿车行走、越障、越沟和爬坡等动作,达到了海底采矿车远程控制的要求.