基于FMEA和FTA的ZPW-2000A轨道电路可靠性分析

摘要

According to the reliability issues of ZPW-2000A type jointless audio frequency-shift modulated track circuit system, the method of combining Failure Modes and Effect Analysis(FMEA)and Fault Tree Analysis(FTA)is proposed for research and analysis of the system reliability. The system is analyzed and defined, and the FMEA table is completed. All possible failure modes, failure effects, fault detection methods and remedial measures are obtained. The fault tree is built. The minimal cut sets of the fault tree are got, and the qualitative and quantitative analyses of the fault tree are conducted. The weak links of the sys-tem are located by qualitative analysis. The fail probability of roof events, important degree of each minimal cut sets and reliabil-ity index are gained through the quantitative analysis. The validity of the reliability analysis method is verified by comparison with the relevant technical requirements.%针对ZPW-2000A型无绝缘移频轨道电路系统的可靠性问题，提出采用故障模式影响分析（FMEA）和故障树分析（FTA）相结合的方法，对系统进行可靠性研究和分析。通过对系统分析和定义，建立故障模式影响分析表，找出所有可能的故障模式、故障后果、故障检测方法和补救措施等，在此基础上建立系统故障树，求取最小割集，进行定性和定量分析。定性分析判定系统的薄弱环节，定量分析计算顶事件的故障概率、各最小割集的重要度及系统的可靠性指标，通过与相关技术规定比较，验证了该可靠性分析方法的有效性。