中文摘要：

共模故障是一种存在于冗余结构系统中的特殊故障,给系统带来巨大的安全隐患。为保证列车运行控制系统的高安全性和高稳定性,安全计算机系统采取异构冗余结构。为了讨论共模故障对冗余系统的影响,文章对异构、同构两组安全计算机系统分别建立了动态故障树,并且采用马尔可夫链分析方法进行故障率和可靠度计算,对计算结果进行分析对比。结果表明,改进后的异构安全计算机可以减小共模故障给冗余结构系统带来的负面影响。

英文摘要：

Common mode failure is a special fault that exists in the redundant structure system, which brings great safety risk to the system. In order to ensure the high safety and high stability of the train operation control system, the safe computer platform adopts heterogeneous redundant structure. In order to discuss the infuence of common mode fault on redundant system, this article established two dynamic fault tree respectively for common and heterogeneous of safe computer systems, and used Markov chain analysis method to calculate failure rate and reliability. The results showed that the improved heterogeneous safety computer could reduce the negative impact of the common mode fault on the redundant structure system.