汽车CAN网络协议设计及实验测试

针对汽车CAN网络控制系统，依据CAN协议技术规范，重点制定了仪表显示、车灯控制和传感器信号采集部分的应用层协议。CAN总线系统是信息地址定位，而不是设备地址定位，系统采用29位标识符的扩展模式，定义了2个字节的标识符ID的和1个字节的数据域编码。采用自行设计的上位机监测软件和OAN分析测试软件ZLGOANtest对CAN总线上的数据进行实验测试，在PC机上观察节点报文的发送和接收情况。经试验调试表明，报文接收和发送正常，此协议的制定能够实现硬件系统所要求的功能。     

CAN总线在储粮水分自动测试系统中的应用

介绍基于CAN的储粮水分自动测试系统,着得讨论了利用CAN总线进行通信的通信规程。     

基于CAN总线的低温等离子体设备系统

基于CAN(控制器局域网)总线的现代测控技术可以提高低温等离子体设备自动控制的实时性、可靠性和可扩展性.针对典型低温等离子体设备实验平台,通过设计制作的智能节点和带有CAN接口卡的PC机建立起了1个基于CAN总线的低温等离子体设备系统,详细介绍了影响该系统实时性的2个关键问题.实验结果表明,该系统可以稳定可靠工作、可以实现对重要参数的自动稳定控制,驱动频率在20 ～60 Hz之内,真空度上下波动量为9Pa.     

CAN总线在VRV变频空调系统中应用

提出用CAN总线技术实现VRV空调系统中室内机与室外机之间通信的设计方案.在分析CAN总线技术特点和VRV空调系统通信要求的基础上,确定通信结构和通信对象模型,给出VRV空调系统拓扑结构、CAN通信硬件方案和软件设计思想.经试验调试证明,利用CAN总线技术能有效地解决VRV空调系统中室内机与室外机之间的通信问题.     

基于汽车电子网络的CAN总线简化型混合调度算法

现有的控制器局域网（CAN）总线调度算法性能不能很好地满足汽车电子网络化发展的需要,针对这一问题,首先分析了现有CAN总线网络节点消息优先级调度算法的优缺点,然后针对CAN总线网络在汽车电子控制网络系统中的特点,在混合调度（MTS）算法的基础上提出了一种简化型混合调度（EMTS）算法。仿真实验结果表明,该简化算法能达到原算法的性能,在节点消息截止期相近的情况下,其调度性能比MTS算法有所提高。     

CiA协会发布CANopen设备协议CiA 4561．0版本

CiA（CAN in Automation）协会发布了针对可配置网络元件的CANopen设备协议CiA4561．0版本,可配置网络元件包括CAN桥及CAN开关。桥连接两个CAN段,而开关则可连接两个以上的CAN段,以此通过支持CANopen的CAN插口可实现对CAN信息的传输率、转送以及过滤的配置。CANopen端口执行CIA456协议。     

CAN总线在混合动力汽车中的应用研究

在研究CAN通信协议的基础上，介绍了CAN总线技术在混合动力XL2000整车上的应用，台架试验结果表明，CAN通信完全满足整车控制系统的要求，达到了较高的性能指标。     

CAN总线的CSMA/CA通信过程的DSPN建模与性能分析

针对采用CSMA／CA协议的CAN总线通信过程进行建模及性能分析，应用确定与随机Petri网DSPN，对每个节点进行确切的描述，构成一个单网段复合模型，并在此基础上构建一个简化的紧缩模型。仿真实验验证了紧缩模型能够很好地逼近复合模型，且求解时间短，可以通过紧缩模型进行CAN总线系统吞吐量、平均信息时延、通信冲突率和网络利用率的定量和定性分析。     

CAN总线技术在汽车车速表和里程表中的应用

以PHILIPS公司的SJA1000为例，介绍了CAN现场总线的特点，控制器的功能、结构和CAN2．0B总线协议的基本内容，阐述了一个基于CAN总线的汽车车速和里程表应用系统、系统性能要求、系统硬件构建和软件设计思路。     

工业在线色谱仪温控器的DeviceNet智能通信节点的设计

针对目前国产工业在线气相色谱仪对较高实时性和可靠性的要求,研发了基于CAN总线DeviceNet协议的工业气相色谱仪温度控制器.系统以ATmega128单片机为核心处理器,CAN总线为底层通信网络,上层网络通信协议采用国标DeviceNet协议.温度控制信号通过CAN总线从上位机发送给温度控制器的DeviceNet智能节点.在设计中,建立了DeviceNet的基本模型,实现了基于8位高速单片机ATmega128的DeviceNet软硬件设计.     

支持Portlet互操作的容器

为解决企业门户中Portlet组件的互操作需求,设计了一个基于订阅/发布技术的支持互操作的Port-let容器,为企业门户中基于Portlet应用的协同互操作提供了一种解决方案.在此容器中,基于订阅/发布模式的Portlet互操作通信模型,通过发布订阅机制来实现Portlet之间消息的通信.通过消息队形存储通信的消息,可实现不同应用范围之间、不同门户页面之间,以及本地和远程之间的Portlet互操作.此外,该容器还支持互操作Portlet的订制.     

面向无线射频识别应用的复合订阅匹配

传统的发布/订阅系统不支持具有丰富时序关系的复合事件,不能很好地满足无线射频识别应用的需要.针对无线射频识别应用的特点,设计了面向无线射频识别应用的复合订阅语言,研究了订阅语言的组成和使用,基于时间事件、复合订阅的匹配图表示、事件检测的消费语义,给出了相应的复合订阅匹配算法.该算法已在OncePubSub系统中实现,并与Siena改造版、JESS改造版进行了性能比较.     

Modular architecture model of CSCD system

A modular architecture model of a computer-supported collaborative design (CSCD) system is proposed on the basis of the hierarchical structure characteristics of a distributed collaborative design system and advanced component object technology. The model mainly regards the module as the core organizing and managing design objects and uses the common object request broker architecture (CORBA) specifications as an interactive platform to achieve object communication. The browser/server computing model deals with the remote heterogeneous collaborative design problem. Product design strategies and mechanisms for collaborative design are separated to facilitate the application of distributed collaborative design environment for quick implementation. The open design framework for CSCD system developers can support the implementation of distributed collaborative design to improve product design speed and reduce product development time. The modular CSCD system (MCSCDS) model and its implementation are achieved in the modular CSCD, a prototype system.     

基于CORBA的网络机器人A/V流式服务的设计和实现

在基于CORBA开发的分布式网络化机器人的控制平台中，传统的基于请求／应答模式不能满足对服务质量要求严格的多媒体数据流实时传输。针对系统的应用框架，本文提出了采用工厂模式对OMG的CORBA A／V流式服务模型进行简化，实现分布式网络化机器人的实时音视频传输。实验表明了这个方案的先进性和有效性。     

RETRACTED: Mechanisms responsible for synergy between fretting and corrosion for three biomaterials in saline solution

This article has been retracted at the request of the editor.

Reason: It has been brought to our attention that the above article is substantially based, without the author's permission, on material submitted in 1998 in his PhD dissertation to the University of Science and Technology, Beijing, by Dr Zhijun Bai, and that it was submitted for publication without the knowledge of either Dr Bai, or of Professor Yinshun Wu, the third-named author.

The Editor-in-Chief of Wear and Elsevier, who published the article in good faith, now wish to treat this paper as retracted and express their disappointment at the inconvenience caused to Dr Bai and Professor Wu.     

Research on collaborative conceptual design based on distributed knowledge resource

Conceptual design is an early stage of the whole product development process, which involves the generation of solutions to satisfy the design requirements. It is a crucial issue on how to find proper principle solutions from enormous, isomeric, and even distributed knowledge resources repositories and then ally with these correlative distributed knowledge resources providers to collaborative conceptual design. Design is a task-solving process using corresponding resource, so it does not always have an agency in product design. This paper proposes a model of collaborative conceptual design based on distributed knowledge resources, which is centered on design tasks and based on dynamic knowledge alliance without agency. After a model of knowledge resource unit and a model of Web services based on knowledge resource are proposed, a virtual quantitative and qualitative knowledge resource representation based on knowledge grid is then put forward. The mixed knowledge resource repository is also proposed to support collaborative conceptual design. The strategies of knowledge register, publish, storage, reorganization, orientation, and problem solving based on mixed knowledge resource repository are then discussed in detail. The data exchange mode of principle solutions is then described. The selection strategy of dynamic knowledge alliance members is established. The framework of distributed knowledge resource is also put forward to support collaborative conceptual design. The process of collaborative conceptual design based on distributed knowledge resource is then proposed. The conceptual design of new devices for decreasing resistance of amphibious vehicles is given as an example, which demonstrates that the methodology is obviously helpful to produce valuable principle solutions with distributed knowledge for product innovation.     

分布式优化模式及其协调策略的研究

将分布式计算技术应用于耦合优化问题的求解中,提出一种易于实现并行决策的分布式优化模式。探讨子优化模型并行计算和协调控制策略,并建立了一种处理耦合变量冲突的协调模型。工程优化实例验证了本方法和策略的有效性。     

DCOM and MMS–based control software architecture for automated manufacturing system

In this paper, we introduce the manufacturing message specification (MMS) and compare two distributed object approaches–distributed component object model (DCOM) and common object request broker architecture (CORBA), suggest characteristics that DCOM is more suitable for automated manufacturing system (AMS) control software integration. In order to make a control system provided with interoperability and reconfigurability etc., a hybrid control system is built for AMS, then a control software architecture is presented for AMS based on distributed object DCOM middleware and MMS standard. The object-oriented DCOM communication protocol is used to implement the MMS in a distributed object mode. DCOM and MMS combination brings the operating system independent communication capabilities to manufacturing devices such as CNC machine tools and industrial robots in AMS. Control software implementation of MMS concepts in the DCOM environment is particularly discussed. Finally, to verify the control software architecture for AMS, prototype development has been implemented in VC++ 6.0 developer environments.     

利用信息化技术强化计量管理——青钢对汽车衡计量管理系统技术改造

青钢对汽车衡计量管理系统的技术改造,基本上实现了数据自动采集、查询、统计、报表、系统维护等功能,不断完善计量检测体系,确保了信息数据的完整性、准确性和及时性,提供了可靠的计量数据,提高了计量管理水平。     

基于Web工作流的质量控制系统模型的研究

针对传统工作流对动态联盟企业分布式异构环境支持不足和难以标准化的缺陷，采用Web Services技术建立了支持动态联盟企业协同的Web工作流模型，研究了模型的体系结构、基于WSFL的工作流元模型描述，以及任务分解策略与协调控制机制。在此基础上设计了面向制造过程的质量控制系统模型，对系统与平台的集成策略、质量信息的统一表示等技术加以研究，可以满足联盟企业的跨平台系统重组、协调、信息交互和质量控制等要求。最后，以卫星的合作生产实例验证了模型的有效性。