摘要
TYJL—ECC计算机联锁控制系统主要包括非故障-安全要求的操作表示、维修接口层以及有严格故障-安全要求的逻辑运算层、采集驱动层。其中逻辑运算层和采集驱动层的可靠性决定了整个系统的可靠性,对其进行系统的故障树分析。基于故障树对系统可靠性评估的一般步骤,依照本系统的典型配置和实际工作过程,定义系统的故障模式。依据相关标准对构成本系统的最基本的功能模块进行可靠性预测。根据故障模式和可靠性预测建立系统的故障树。根据马尔可夫过程的特性,对与门、或门及三取二逻辑进行定量计算。从而可计算出整个系统的失效率和平均修复时间。经计算所得系统的平均故障间隔时间符合铁道部规定。研究表明,TYJL—ECC容错计算机联锁系统具有很高的可靠性和安全性。
TYJL_ CC fault-tolerant computer interlocking control system includes two non-failsafe levels of operation and indication, maintenance interface and two vital failsafe levels of logic processing, input and output. Among them, the level of logic processing and the level of input and output are the decisive parts for the reliability of the whole system. So Fault Tree Analysis （FTA） method is mainly adopted to evaluate these two parts. According to the general procedures of system reliability evaluation using FTA method, firstly the system fault modes are defined for the typical configuration and practical working process. Then reliability prediction of all functional modules is performed with reference to some related standards. Finally the system fault tree is built up based on the defined fault modes and reliability prediction. With respect to the characteristic of Markov process, quantificational calculations are done to AND gates, OR gates and 2-of-3 logic. The failure rate and mean down time of whole system can be obtained. The calculation result indicates that MTBF of the system can meet the requirement of Ministry of Railways. As it is shown, TYJL_ECC fault-tolerant computer interlocking control system features high reliability and safety.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2005年第6期102-106,共5页
China Railway Science
关键词
铁路信号
计算机联锁
容错
故障树
Railway signaling
Computer interlocking
Fault-tolerance
Fault tree
