双模冗余-比较系统的可靠性和安全性分析

Reliability and security analysis of comparison system of double dual-module redundancy

提出一种新的冗余系统模型——双模冗余-比较系统,给出该模型下的两种实现策略,利用马尔柯夫过程研究了不同策略下的可靠度和安全度,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在修复率为0时可靠度最大,安全度与三模冗余系统相当而高于双机热备系统,在修复率为0.01时,安全度最大,可靠度略小于三模冗余和双机热备系统.

This paper puts forward a new redundancy model, comparison system of double dualmodule redundancy （CS-DDMR） and gives two kinds of realization strategy of the system. The reliability and the security of both the strategies are studied by using Markov process. By simulation calculation with MATLAB, the influences of different fault-covering rates and maintainable rates on reliability and security are analyzed. Comparative study of both the strategies with triple module redundancy system （TMRS） and dual module hot standby system （DMHSS） shows that the security of CS-DDMR with strategy 1 is the greatest, but its reliability is lowest. If maintainable rate is 0, the reliability of CS-DDMR with strategy 2 is greatest and its security is almost equal to that of TMRS and greater than that of DMHSS. If maintainable rate is 0.01, the security of CS-DDMR with strategy 2 is the greatest and its reliability is slightly less than that of TMRS and DMHSS.