共查询到18条相似文献,搜索用时 125 毫秒
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为有效处理工业以太网通信中的瞬时故障,提出了一种基于芯片、节点和系统的多层次瞬时故障处理机制.根据工业以太网通信中瞬时故障的特点,从多个层次对瞬时故障的致因进行了分析.在此基础上设计了相应的处理方法,芯片层利用芯片提供的硬件逻辑结合软件技术自动调整芯片工作状态;节点层运用软件看门狗以及软件冗余;系统层定义特殊的帧格式和设置定时器.实验结果表明,多层次瞬时故障处理机制能有效降低网络的丢包率,提高了系统的可靠性. 相似文献
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鉴于瞬时故障是导致控制系统事故的主要故障形式,瞬时故障恢复是保证系统安全的重要手段,首先,介绍了当前通过主动冗余和基于系统模型分析进行瞬时故障恢复的方法;然后,综述这些技术在网络化控制系统的通信网络、网络节点、系统层面瞬时故障恢复和安全控制中的应用研究;最后,对网络化控制系统瞬时故障恢复和安全控制方法的发展趋势进行了展望. 相似文献
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IEC 62439系列协议专为高可用性工业自动化网络所设计,它们各具特点,着重分析IEC 62439-6 DRP(分布式冗余协议)的通信机理以及故障检测与恢复机制。根据DRP环形网络循环周期、网络交换设备数量、报文处理时间等一系列参数,提出了一种关于故障检测至恢复所需时间的算法。经测试平台的验证,DRP网络能迅速地检测出节点和链路的故障,并能在短时间内恢复网络的通信功能,满足现代工业网络对网络高可用性的要求。 相似文献
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无线传感器网络的级联故障模型主要侧重于节点容量对网络性能的研究,忽略了链路容量的影响,从而导致流量指标无法正确反映无线传感器网络的汇聚特征.鉴于此,本文建立了一种受节点容量和链路容量限制的无线传感器网络级联故障模型.首先,根据新的流量指标"方向介数"重新定义了网络负载;其次,通过构建网络级联抗毁性模型,使故障节点可在一定时间延迟后从故障状态恢复.最后,提出了一种路由恢复机制,可以有效改善网络级联故障的抗毁性,并进行了仿真对比测试.结果表明:本文提出的方法可以帮助故障网络在较短时间内得到恢复,使网络状态更加稳定. 相似文献
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控制器部署技术是软件定义网络的重要研究方向。现有控制器布局技术更多地关注节点故障时网络的鲁棒性布局方法,缺乏对连边故障情况下的灾备分析。为了解决这个问题,建立了一种低故障恢复开销软件定义网络控制器布局模型,该模型针对连边故障进行设计,并利用基于模拟退火思想的算法进行求解。仿真结果表明,该模型及算法在尽量少地损失网络时延代价的同时,有效降低了控制路径出现故障时网络的故障恢复开销。 相似文献
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接触网电气闪络现象发生在供电输出端,电力机车与受电弓脱离或剐蹭,造成铁道沿线设备跳闸和线路运营中断。通过接触网暂态电流过程分析,采集故障瞬态点通道数据,仿真模型针对接触网运行中如雷击、风雨、电压闪变和噪声干扰滤波具有预防作用。在综合分析接触网供电故障特点的基础上,建立数据库实时检测查询系统和案例分析库,通过参数对比与归类,能够迅速准确地分辨故障前后发生的问题,最大程度减小电气故障对接触网的影响,保证供电系统安全可靠地运行。 相似文献
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transport net corresponding to an undirected biconnected graph on a distributed or network model of computation. The algorithm is resilient
to transient faults and does not require initialization. In addition, it is capable of handling topology changes in a transient
manner. The paper includes a correctness proof of the algorithm. Finally, it concludes with some final remarks.
Received November 26, 2001 Published online February 18, 2002 相似文献
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Traditional concurrent-checking techniques may not detect the occurrence of the transient faults and resulting errors likely to affect clock signals in VLSI systems. The authors present a new method and self-checking circuit implementation for concurrently checking the correctness of clock distribution network signals in synchronous systems 相似文献
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Markov chain models are used to evaluate the dependability properties (reliability, safety, availability, maintainability etc.) of the mission-critical systems. Dependability models are often focused only on the basic stuck-at faults. On the other hand the transient faults are present in the operational environment but not included in the dependability prediction. The aim of this paper is to show how the transient faults influence the dependability prediction using the Markov chain model. In this paper basic TMR Markov chain model using stuck-at faults is compared to our extended TMR model considering both the stuck-at and transient faults. The main focus is given on the calculation of the dependability parameter lambda (i.e. the failure rate of the system). 相似文献
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针对电力系统输电线路一系列的短路故障,把希尔伯特黄变换(HHT)完成对暂态信号特征量的提取与概率神经网络(PNN)作为诊断故障分类器相结合的方式,作为对输电线路故障分类的方法.利用HHT能够充分反映局部暂态信号的特点,对集合经验模态分解(EEMD)后的故障信号进行小波阈值降噪,运用HHT进行重构,得到三相电流以及零序电流4组特征能量函数值,并作为4组特征量输入到经遗传算法优化过平滑因子的PNN中进行训练,最终得到分类器.经Matlab仿真实验显示,该方法能够有效优化信号波形并提高故障分类精度. 相似文献
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Network-on-Chip (NoC) is becoming a competitive solution to connect hundreds of processing elements in modern computing platforms. Under the trend of shrinking feature sizes, circuits are likely to suffer from faults which lead to degraded performance and erroneous behaviour. Compared to permanent faults, transient faults happen even more frequently and seriously while they are hidden within complex on-chip behaviours. One of the serious consequences caused by transient faults is taking illegal turns by the packets after the damage of control logic in on-chip routers which may lead to a deadlock situation and eventually crashing the entire system. To avoid this situation, in this paper, we propose a comprehensive scheme called ODT including an improved router architecture, an illegal-turn-resilient routing algorithm, online fault-detect units and a fault classification method. By applying ODT, more turns are supported on routing level and the deadlock situations can be significantly reduced. Experimental results indicate up to 22% increase of the survived packets in the network when 4% of routing computation units in failure. The extra area overhead and power consumption of ODT method is around 9.22% and 9.63%. 相似文献
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介绍一种基于线路分布参数模型的、可利用故障暂态信息的配网电缆单相接地故障测距方法,应用于高精度电缆测距装置上,能对电缆故障快速精确定位,缩短恢复供电时间,有效弥补传统型电缆故障测距仪器的不足. 相似文献