“二乘二取二”和“双模冗余-比较”结构对比研究

Comparison study of D2V2R and C-DDMR structure

研究了"二乘二取二"冗余(D2V2R:double 2-vote-2 redundancy)和"双模冗余-比较"(C-DDMR:comparison of double dual-module redundancy)结构的工作原理,提出了D2V2R结构和C-DDMR结构两种控制策略。利用马尔柯夫过程分析了不同策略下的可靠度和安全度,并用MATLAB进行了仿真计算。对比研究表明,如果选择策略1,则在模块的故障检测覆盖率较高时,C-DDMR结构优于D2V2R结构,在模块的故障检测覆盖率较低时,D2V2R结构优于C-DDMR结构;如果选择策略2,D2V2R结构优于C-DDMR结构。

In the paper the working mechanism of D2V2R （double 2-vote-2 redundancy） structure and C-DDMR（ comparison of double dual-module redundancy）structure is studied, and two kinds of control strategy of D2V2R structure and C-DDMR structure are presented. The strategies reliability and security of D2V2R and C-DDMRare analyzed with Markov procession and simulated with MATLAB. Comparison study indicates that if the first strategy is used, C-DDMR is better than D2V2R when module has high fault-coveting rate, and D2V2R is better than C-DDMR when module has low fault-coveting rate. If the second strategy is used, D2V2R is better than C-DDMR.