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In many critical applications of digital systems, fault tolerance has been an essential architectural attribute for achieving high reliability. In recent years, the concept of the performability of such systems has drawn the attention of many researchers. In this paper we develop a general Markov model for fault tolerant computer systems. Various important performance measures, including the performability measures as well as some new performance measures, are treated in a unified manner. Furthermore, general and efficient computational procedures are developed for calculating these performance measures based on the uniformization technique of Keilson. A numerical example is given to illustrate the computational procedures developed. 相似文献
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高压分压器击穿故障模式分析 总被引:1,自引:0,他引:1
杜涛 《电子产品可靠性与环境试验》2004,(6):53-55
通过对高压分压器击穿故障模式的分析和试验研究,发现在抽真空灌注过程中,中空结构的分压器会形成局部低气压,导致分压器击穿。同时,对高压分压器的结构提出了改进设计。 相似文献
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设备是医院进行诊断的最主要基础,不过CT设备由于使用的特殊性和设备使用环境的特殊性,其维修管理一向是一个制约CT大规模诊断的关键环节。对于CT医疗设备的操作与运行中常见的设备故障,不但要根据故障进行科学的处理,而且要保障CT医疗设备的最佳工作状态,提高医疗临床的服务质量。CT设备的故障应该还是有规律可循的,因为许多故障是可以进行系统化与功能化预防的。本文为此具体探讨了CT故障诊断中系统化功能化维修思路的建立。 相似文献
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文章主要讨论了在CDMA网络中EVDO的掉话现象,并分析引起掉话的原因,通过对不同原因的分析及定位,找出对应的解决问题的方法,降低掉话率,提升网络质量。 相似文献
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Cha Y.S. Zhongjin Yang Turner L.R. Poeppel R.B. 《Applied Superconductivity, IEEE Transactions on》1998,8(1):20-25
An analysis was carried out to predict the forced response of the equivalent circuit of an innovative superconducting fault current limiter (FCL). The FCL employs two superconducting coils with differing critical currents wound noninductively. The analysis shows that to reduce the voltage drop under normal operating conditions, the coupling coefficient should be kept fairly high (k>0.90). For a given coil configuration (ωL¯=constant), the limiting capability of the device increases with the resistance R of the trigger coil up to a certain value of R, then further increase in R changes very little the limiting capability of the FCL. However, further increase in R can reduce the heat generation rate in the device which will help alleviate the problem of relatively long recovery time. The fault current predicted from estimated values of R compares fairly well with results of an experiment reported in the literature. The discrepancy between the predicted and measured current is due mainly to the uncertainty in the estimated resistance R, because both the purity of Cu and the percentage of Cu in CuNi are not known. By varying the ratio of NbTi-Cu-CuNi in the matrix, the purity of Cu, and the percentage of Cu in CuNi various values of R, can be achieved, which should help to alleviate the problem of excessive Joule heating and recovery time 相似文献
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介绍了同步传输常用的技术标准和符合国际规范的同步数据与定时信号关系,根据我国航天测控网中常用通信设备的时钟方式设置,对某国军标中存在的问题进行了探讨,并提出了修改意见。通过对高速数据在不同时钟方式下的传输效果比较,指出了合理选择时钟的重要性,可为实际的工程应用提供参考。 相似文献
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Wireless Networks - Aiming at the vulnerability propagation of all-optical networks, combining with the characteristics of the all-optical network, a formal modeling and analysis method for... 相似文献
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风力发电是目前国家新能源发展战略中的重要领域.在风电场运行过程中,线路故障问题是影响比较大,并且比较常见的问题,因此,对于风电企业相关技术管理人员来说,就要密切关注这方面的问题,做好日常的检修排查,对比较容易导致线路故障问题出现的环节进行仔细的分析,进而在此基础上采取有效的解决措施. 相似文献
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动力机械设备在运行的过程中,对安全性及可靠性的要求是非常高的,不过在实际运行的过程中,动力机械设备比较容易出现各种故障,进而影响设备的安全性及可靠性。在本文中,介绍了几种常用的动力机械设备故障诊断技术,并分析了影响故障诊断技术发展的因素,同时分析了动力机械设备故障诊断技术的发展趋势。 相似文献