Energy analysis of electric vehicles using batteries or fuel cells through well-to-wheel driving cycle simulations

This work presents a study of the energy and environmental balances for electric vehicles using batteries or fuel cells, through the methodology of the well to wheel (WTW) analysis, applied to ECE-EUDC driving cycle simulations.     

基于ICE与HTTP Tunnel技术的NAT/FW穿越方案

在现代网络中,越来越多的主机被部署在NAT和防火墙(FW)之后,这就要求VoIP、P2P等通信软件必须具备穿越NAT/FW的能力,才能实现端到端的数据传输.现有的STUN、TURN、ICE等方案虽然可以穿越大部分NAT/FW,但对有端口或协议限制的防火墙却无能为力.本文提出了将ICE和HTTP Tunnel技术相结合的穿越方案,设计并实现了可跨平台运行的HTTP Tunnel模块来配合ICE进行穿越.实验证明,在防火墙只开放80端口这种苛刻的条件下,该HTTP Tunnel模块也能够成功穿越大部分防火墙,实现数据流的稳定传输.     

电无级变速器的内燃机最佳效率控制

通过对混合动力汽车电无级变速器传动机构原理分析,提出一种内燃机最佳效率控制策略。该策略主要是基于底层控制系统的硬件结构,根据上位机发送的指令对双机械端口电机的内转子进行转矩控制,实现内燃机最佳效率运行;对外转子进行转速控制,满足车辆运行需求。并且给出了该策略下转矩辨识的方法;同时给出在整车中车辆总成控制与双机械端口电机控制系统和其他系统配合关系。通过实验,验证了该控制策略可以实现内燃机最佳效率运行同时满足负载侧连续平滑调速的可行性。     

卫星地面测试系统Android平台客户端研究

基于ICE中间件的卫星地面测试系统充分利用ICE中间件分布式、跨平台和跨语言的特点,采用客户端/服务器构架,实现了卫星测试业务软件部分的各项功能,提供对系统运行状态的全面监控。提出了一种Android平台客户端解决方案,运行于测试设备中独立的嵌入式监控板卡之上,通过与设备ARM-Linux平台服务器端业务板卡的通信,实现对测试设备业务运行情况的监视和控制。     

Fusion Safety Research and Development in JAERI

This paper describes the current status and future plans of the fusion safety research and development regarding to the developments of the dust removal system and safety analysis code and the thermofluid experiments in the Japan Atomic Energy Research Institute (JAERI) for a fusion experimental reactor. The containment of the radioactive material is the key to achieve fusion safety. In the event of accidents, the source terms need to be evaluated with sufficient accuracy. Therefore, in JAERI, the dust characterization have been investigated and the dust removal system using electric force has been developed and tested. A safety analysis code including both thermal and plasma transient analyses under the various event sequences has been developed. Moreover, the preliminary experiments of thermofluid transients in the vacuum vessel such as Ingress of Coolant Event (ICE) and Loss of Vacuum Event (LOVA) have been started and the experimental results using preliminary LOVA/ICE apparatus during 1995–1996 are summarized in this paper.     

基于Zookeeper的分布式ICE中间件研究

分布式ICE中间件是一款高效的RPC框架,它支持跨语言开发,其中的IceGrid服务是整个框架的核心,主要的作用是给客户端提供位置管理,远程管理,负载均衡和服务注册等服务.在ICE构建的分布式平台中,一旦IceGrid服务出现问题,整个网络通信就会出现问题.IceGrid本身支持主从模式的高可用,但是当主节点不可用时,从节点不会自动升级为主节点,必须在从节点进行手动配置重启,这严重影响了IceGrid的效率.Zookeeper是开放源码的分布式应用程序协调服务,它是一个为分布式应用提供一致性服务的软件,本文提出一种基于Zookeeper的IceGrid服务的高可用改进模型,当主节点不可访问时,由Zookeeper在从节点中进行选举协调,选中的从节点自动升级为主节点.     

基于前置层和消息总线的数据传输

大量模块或者第三方数据接入以及上层用户定制应用需求的繁杂性必定要求系统在数据传输上具备灵活、通用、可扩展等性能,因此设计和实现一种驿站中间层数据传输方案成为开发人员的一项关键任务.数据接入方面增加统一处理数据的前置层,设计中采用链路连接层、规约处理层、前置管理层的架构并构建了前置实时数据处理库;考虑到跨平台和数据类型区分处理清晰原则,构建了以ICE中间件和JSON串为核心的消息总线数据传输,设计与上层应用程序和前置模块的交互接口.总线传递机制将应用软件层和前置层区分来,按照协定好的消息类型通过总线实现信息交互,屏蔽了系统的多种不同的上层应用需求和前置开发通信协议特性,提高了开发人员的工作效率以及系统本身的健壮性、扩展性,同时也降低了后续维护人员的维护难度.     

IO服务在综合化航空电子系统中的应用

为了隔离应用程序与航空总线驱动程序的关联,提高应用程序的可移植性,实现了跨平台、通用、异步、松耦合、一对多的IO服务.IO服务通过总线插件技术、总线通道的反射创建技术、XML配置技术,实现了IO服务的通用化.通过订购发布机制实现了总线通道与使用者之间的松耦合和一对多的关系,同时订购数据转发引入了组播技术,使得一对多的数据转发效率得到提升.在实际综合化航空电子系统中,IO服务与ICE中间件相结合,增加了软件架构设计的灵活性,提高了软件的移植性,降低了软件复杂度和调试难度.     

基于ICE的安全中间件的研究与实现

分布式系统平台间的差异增加了分布式安全服务的开发复杂性,通过对网络安全技术及面向对象中间件技术的研究,结合ICE技术的优势,提出一种基于ICE的安全中间件架构模型。该方案可以降低各模块间的耦合度,提高系统安全服务的健壮性和可扩展性。同时采用ICE的分布式通信代理模块技术,实现各节点间的安全透明通信。     

Evaluation of performance characteristics of a novel hydrogen-fuelled free-piston engine generator

In this work, we present the experimental results obtained from hydrogen fuelled spark-ignited dual piston free-piston engine generator (FPEG) prototype operated in two-stroke and four-stroke mode. The FPEG testing was successfully conducted at 3.7 compression ratio, engine speed between 5 Hz and 11 Hz and with different equivalence ratios. The FPEG technical details, experimental set-up and operational control are explained in detail. Performance indicators show that both equivalence ratio and engine speed affect the engine operation characteristics. For every set of specified FPEG parameters, appropriate range of equivalence ratio is recommended to prevent unwanted disturbance to electric generator operation. Both two-stroke and four-stroke cycle mode were tested, and the results showed different combustion characteristics with the two thermodynamic cycles. Four-stroke cycle mode could operate with indicated thermal efficiency gain up to 13.2% compared with the two-stroke cycle.