两种铁路信号系统双机热备结构可靠性与安全性分析

双机热备系统已广泛应用于现代铁路信号系统中,国内外学者对其可靠性和安全性进行广泛而深入的研究,但在研究的过程中并没有区分不同的系统结构,鉴于此,分析传统的仅具有故障自检和同时具备自检与比较程序互检的两种不同的双机热备结构。综合考虑共因失效、在线诊断、多故障模式等因素,建立两种双机热备结构的同构马尔可夫模型并对其进行仿真,根据仿真结果对两种双机热备结构的可靠性、安全性进行分析比较。分析结果表明,带比较程序的双机热备结构具有更高的可靠性和安全性,更适合在铁路上推广应用。

Reliability and Security Analysis on Two Railway Signal Dual Computer Hot Standby Systems

Dual computer hot standby system has been widely used in modern railway signal system and scholars from home and abroad have conducted extensive and deep researches on the system reliability and security,but failed to address the differences in system structures. In view of this,this paper analyzes two types of dual computer hot standby systems,namely the traditional system with only selfdiagnosing,and the system with both self-diagnosing and program comparison. With reference to such factors as common-cause failure,online diagnosis and multi-failure modes,the isomorphic Markov model of dual computer hot standby system with different structure is established. According to simulation results,the reliability and security of the two structures are compared. The results show that dual computer hot standby system with comparative program is more reliable and safer,and even more applicable to railway.