二乘二取二系统的一种新降级策略研究

New Degradation Strategy of Double 2-out-of-2 System

随着国内轨道交通行业的高速发展,系统的安全性和可靠性越来越受到重视。以提高轨道交通控制中常用的二乘二取二安全计算机的可靠性和安全性为目标,分析了几种常用冗余结构的可靠性,进一步提出了一种基于三取二冗余结构及二乘二取二冗余结构的新降级工作策略。在考虑多模故障的情况下,分析了该系统所有工作状态以及各状态之间的转移关系,依此建立马尔可夫状态转移模型,通过MATLAB分析新降级工作策略下系统的安全性和可靠性。与传统二乘二取二系统进行对比,新降级工作策略下系统具有更高的可靠性。

With rapid development of railway in China, safety and reliability of systems have been paid more and more attention. In order to improve the reliability and safety of double 2-out-of-2 system which is widely used in railway vital computers, the reliability of several commonly used redundant architectures were analyzed and a new degradation strategy was proposed based on the analysis of the architecture of double 2-out-of-2 and 2-out-of-3. In the case of simultaneous failure of multiple modules, the working strategy and the transition of all states of the system were analyzed, and the Markov state transition model was established. Its reliability and safety were evaluated by MATLAB. Compared with the traditional double 2-out-of-2 system, the new degradation strategy system has higher reliability.