摘要
介绍二乘二取二安全计算机的工作原理及共因失效对其可靠性、安全性的影响。在考虑共因失效率、维修率、故障检测覆盖率的情况下,对系统可能存在的状态进行新的划分,建立二乘二取二系统的马尔科夫模型。给出可靠度、安全度和平均无故障工作时间的计算方法,仿真分析共因失效率对系统可靠度、安全度和平均无故障工作时间的影响,对比分析考虑共因失效和不考虑共因失效时系统可靠度和安全度的区别。仿真结果表明,共因失效降低了系统的可靠度和安全度,缩短了系统平均无故障时间,仿真结果符合理论分析结果,采用此方法分析二乘二取二系统共因失效是可行的。
The principles of double 2-out-2 vital computer and influence of common cause failure on its reliability and safety were introduced.The Markov model of double 2-out-2 was established based on a newly proposed state partition idea of double 2-out-2 system in which common cause failure,repair rate and diagnostic coverage were considered.The formulas of reliability,safety and mean time to failure were presented.In the simulation experiment,the influence of common cause failure on its reliability,safety and mean time to failure were tested and analyzed.The reliability and safety were analyzed contrastively whether or not common cause failure was considered.The simulation results show that common cause failure reduces system reliability,safety and meantime time to failure.The simulation result is consistent with theoretical analysis,so the proposed common cause failure analysis method is practicable for the double-2-out-2 system.
作者
张永贤
廖肇聪
汪月乾
陈梅
ZHANG Yong-xian;LIAO Zhao-cong;WANG Yue-qian;CHEN Mei(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China;School of Information Engineering,East China Jiaotong University,Nanchang 330013,China)
出处
《计算机工程与设计》
北大核心
2019年第1期285-289,共5页
Computer Engineering and Design
基金
江西省教育厅科学技术研究基金项目(GJJ160496)
华东交通大学校立科研基金项目(14DQ06)
