_二乘二取二_冗余系统的可靠性与安全性分析.pdfVIP

第 21 卷第 1 期 系 统 仿 真 学 报© Vol. 21 No. 1 2009 年 1 月 Journal of System Simulation Jan., 2009 “二乘二取二”冗余系统的可靠性和安全性分析 1,2 1,2 1,2 1,2 张本宏 ，陆 阳 ，韩江洪 ，魏 臻 (1.合肥工业大学计算机与信息学院，合肥 230009 ；2.安全关键工业测控技术教育部工程研究中心，合肥 230009) 摘 要：提出了“二乘二取二”冗余系统两种不同工作策略，利用马尔柯夫过程研究了不同策略的 可靠度和安全度，通过MATLAB 的仿真计算，分析了故障检测覆盖率和修复率对可靠度和安全度 的影响。与三模冗余和双机热备系统的对比研究表明，策略1 的安全度最大，可靠度最小；策略2 的可靠度最大，安全度在修复率为0.9 时大于三模冗余和双机热备系统，在修复率为0 时略低于三 模冗余系统，而高于双机热备系统。 关键词：表决系统；可靠性；安全性；故障安全；马尔可夫模型 中图分类号：TP302.8 文献标识码：A 文章编号：1004-731X (2009) 01-0256-06 Reliability and Security Analysis of Double 2-Vote-2 Redundancy System ZHANG Ben-hong1,2, LU Yang1,2, HAN Jiang-hong1,2, WEI Zhen1,2 (1. School of Computer Information, Hefei University of Technology, Hefei 230009, China; 2. Engineering Research Center of Safety Critical Industry Measure and Control Technology, Ministry of Education, Hefei 230009, China) Abstract: Two kinds of strategy of double 2-vote-2 redundancy system were proposed. To those strategies, reliability and security were studied with Markov procession. By the simulating calculation with Matlab, the influences of different fault-covering rate and maintainable rate on the reliability and security were analyzed. Comparative study with triple module redundancy system and dual module hot standby system shows: the security of strategy 1 is greatest, but its reliability is lowest. The reliability of strategy 2 is greatest, and its security is greater than that of triple module redundancy system and dual module hot standb