共查询到19条相似文献,搜索用时 140 毫秒
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RapidIO高性能通信中间件设计 总被引:2,自引:0,他引:2
针对RapidIO总线互联系统中网络节点间高效端对端通信功能的缺失,实现了基于消息机制的RapidIO通信中间件,以虚通道的方式为应用提供数据传输功能。虚通道采用HOST节点集中控制的管理方式,易于实现系统功能的迁移与重构。实物环境中的带宽、时延测试表明,RapidIO通信中间件具有很高的传输效率。 相似文献
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为了实现楼宇自动化中的灯光照明系统的网络设计,采用CAN总线协议实现各灯光节点的通信。硬件设计中,上位机节点使用PCI-CAN接口卡,各灯光节点主控制芯片使用PICl8F258,CAN收发器使用PCA82C250,并加入光耦隔离电路。同时对上位机节点及灯光节点进行软硬件设计,使各灯光节点能够实现相互之间的灵活通信,同时可实现调光、降低能耗等功能。经试验,该系统通信稳定,满足了基本的设计要求。 相似文献
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一、引言在信息通信网络中存在信息节点、通信处理节点、交换处理节点、工作站节点等多种类型的节点。各节点功能有所不同,相应地提供各种信息通信服务。随着信息通信服务的多样化发展,针对网络的服务也相应增加。基于此种情况,要求把相同的功能装载于不同的节点上,并且节点间的功能划分也能轻易地改变。这就意 相似文献
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引言在嵌入式系统中,多个孤立节点之间的通信越来越重要,尤其是物联网时代的到来,多节点间通信已经成为必不可少的功能。由此出现了许多通信手段,如RS-232、RS 485、CAN总线、ZigBee等,综合考虑性能和成本,RS-485通信无疑是性价比最高的通信方式。因此探究高效、实用的多机通信方案具有重大的意义。 相似文献
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基于嵌入式技术和CAN总线通信技术,设计了一套分布式结构多电机监控系统;首先对监控中心进行了方案设计,简述了其嵌入式软件中启动代码、板级支持包、人机交互界面、文件系统的开发过程,并对其进行了操作系统UC/OS-II移植和进程任务管理开发;然后根据节点控制器的任务和控制对象,对控制节点进行了硬软件设计;同时根据系统的通信任务要求,介绍了CAN通信在本系统中的应用实现过程。最后通过对3个节点电机的控制进行试验,结果表明,整个系统能完成监控功能并通信稳定;该多电机监控系统成本低、实时性高,易于与其他系统结合,节点和功能易于扩展,具有一定的实用和推广价值。 相似文献
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TTP协议定义了一种高确定性,无冲突,高安全的通信总线,能够满足包括飞行控制等的安全关键实时控制系统的应用要求。时间触发总线验证技术根据TTP协议规范要求,针对研制的节点进行测试,包括基本通信测试、时钟同步、故障注入等不同的测试场景,充分验证被测节点的各项功能、性能。通过这些测试,表明被测节点各项指标都满足研制需求,可用于安全关键实时控制系统。 相似文献
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We study the static load balancing problem in a distributed computer system that consists of a set of heterogeneous computer systems interconnected by a star network with two-way traffic. We formulate the static load balancing problem as a nonlinear optimization problem which minimizes the mean response time. We prove that in the optimal solution the satellite nodes in the star network can be divided into four different types: the idle source nodes, the active source nodes, the neutral nodes, and the sink nodes. The necessary and sufficient conditions for optimal solution are studied. An efficient algorithm of complexity O(n) is proposed for the static load balancing of an n-satellite system. The effects of link communication time on optimal load balancing in a star network are also studied by parametric analysis. By employing the proposed algorithm, a significant system performance improvement over that without load balancing is illustrated in a numerical example. The numerical example also shows that the effects of the link communication time in a star network are large. 相似文献
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Dynamic balancing of communication and computation load for HLA-based simulations on large-scale distributed systems 总被引:1,自引:0,他引:1
Robson E. De Grande Author VitaeAzzedine BoukercheAuthor Vitae 《Journal of Parallel and Distributed Computing》2011,71(1):40-52
Dynamic balancing of computation and communication load is vital for the execution stability and performance of distributed, parallel simulations deployed on the shared, unreliable resources of large-scale environments. High Level Architecture (HLA) based simulations can experience a decrease in performance due to imbalances that are produced initially and/or during run time. These imbalances are generated by the dynamic load changes of distributed simulations or by unknown, non-managed background processes resulting from the non-dedication of shared resources. Due to the dynamic execution characteristics of elements that compose distributed applications, the computational load and interaction dependencies of each simulation entity change during run time. These dynamic changes lead to an irregular load and communication distribution, which increases overhead of resources and latencies. A static partitioning of load is limited to deterministic applications and is incapable of predicting the dynamic changes caused by distributed applications or by external background processes. Therefore, a scheme for balancing the communication and computational load during the execution of distributed simulations is devised in a scalable hierarchical architecture. The proposed balancing system employs local and cluster monitoring mechanisms in order to observe the distributed load changes and identify imbalances, repartitioning policies to determine a distribution of load and minimize imbalances. A migration technique is also employed by this proposed balancing system to perform reliable and low-latency load transfers. Such a system successfully improves the use of shared resources and increases distributed simulations’ performance by minimizing communication latencies and partitioning the load evenly. Experiments and comparative analyses were conducted in order to identify the gains that the proposed balancing scheme provides to large-scale distributed simulations. 相似文献
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汽车车身静态刚度测量 总被引:1,自引:0,他引:1
针对目前我国汽车车身刚度检测设备的落后现状,采用现代微机检测与控制技术开发了一种新型的汽车车身静态刚度测量系统;该系统采用精密测量技术,用DSP2407采集多路数据,并利用工业控制计算机进行数据处理,在线检测汽车车身的刚度状况并以红旗轿车为例,对其白车身进行弯曲变形和扭转变形试验,检测汽车车身的刚度状况;该项目填补了全自动检测汽车车身静态刚度的空白,为国内首创. 相似文献
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基于测试集成电路制造装备仿真平台软件仿真功能的正确性、稳定性和可靠性,开发一种可用于测试仿真设备功能的软件系统.该系统采用分层的架构设计方法,提供测试信息的静态配置和动态运行两种工作模式,有效地解决了不同设备测试任务多样化的问题.该软件架构具有一定的通用性和易扩展性,可作为多任务复杂测试系统的一种通用架构.同时还设计了单命令测试、多命令随机测试、多命令逻辑测试3种类型的测试方法,以提高测试灵活性.运用多线程技术,做合理的线程优化处理,解决了系统运行效率低和通信混淆问题. 相似文献
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静力加载试验谱是根据静力加载试验中的载荷表形成的加载谱形,由不同的目标值和其它参数组成;试验加载谱的生成过程指按规定时间和曲线类型运行到指定值的过程;针对当前静力加载试验中对加载谱控制的多功能要求,参照主流控制系统中上位机的操作流程,实现了一种基于FPGA的加载谱生成与控制算法,满足现有控制系统中试验加载谱的生成模式和各种命令的操作,包括连续加载谱的生成、谱的单步调节、单点控制、选择谱段控制和控制方式切换等,配合系统控制算法为自主控制器的开发奠定基础。 相似文献
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对反映气制动ABS调节器性能的静态参数和动态参数进行分析,提出以码密度进行静态参数测试,和基于xPC实时内核技术的动态数据采集系统的设计方案.针对测试系统实现的关键技术进行了研究,主要包括测试软件界面设计及参数设置、通信接口模块设计、产品合格判断子程序设计、数据实时保存与显示系统软件设计等.通过长期测试试验表明,系统采样频率可达1 kHz,完全满足行业标准要求,从而证明系统开发的有效性和可靠性. 相似文献
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对反映气制动ABS调节器性能的静态参数和动态参数进行分析,提出基于xPC实时内核技术的动态数据采集系统设计;针对测试系统实现的关键技术进行了研究,主要包括测试软件界面设计及参数设置、通讯接口模块设计、数据实时保存与显示系统软件设计等;通过长期测试试验表明,系统采样频率可达1kHz,完全满足行业标准要求,从而证明系统开发的有效性和可靠性。 相似文献
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Load balancing strategies for a parallel ray-tracing system based on constant subdivision 总被引:1,自引:1,他引:0
Hiroaki Kobayashi Satoshi Nishimura Hideyuki Kubota Tadao Nakamura Yoshiharu Shigei 《The Visual computer》1988,4(4):197-209
Static and dynamic load balancing strategies for a multiprocessor system for a ray tracing algorithm based on constant subdivision are presented. An object space is divided into regular cubes (subspaces), whose boundary planes are perpendicular to the coordinate axes, and these are allocated to the processors in the system. Here, load balancing among the processors is the most important problem. Firstly, in a category of static load balancing, strategies for mapping the subspaces into the processors are evaluated by simulation. Moreover, we propose a hierarchical multiprocessor system in order to realize dynamic load balancing with the static one. Its architecture can overcome the limitation of the static load balancing in a large scale multiprocessor system. 相似文献