“二乘二取二”冗余系统的可靠性和安全性分析

Reliability and Security Analysis of Double 2-Vote-2 Redundancy System

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。

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 standby system when maintainable rate is 0.9. On the other hand, the security of strategy 2 is slightly less than that of triple module redundancy system and more than that of dual module hot standby system when maintainable rate is 0.