计算机辅助FMECA与FTA正向综合分析方法研究

Hybrid Method of Computer Aided FMECA and FTA

FMECA(FailureModeEffectandCriticalityAnalysis)和FTA(FaultTreeAnalysis)是分析系统故障因果关系的两种常用技术 .大量工程实践表明 ,它们在用于系统安全性、可靠性分析时取得了显著的效益 .这两种技术分别独立应用时 ,既有各自的优点 ,也存在着一定的缺陷和不足 ,为此综合了FMECA与FTA的优点 ,阐述了复杂动态系统FMECA与FTA综合的思路 ,着重阐述了由计算机辅助FMECA向FTA正向综合建立故障子树的推理算法 ,通过三余度舵机系统的应用 ,证明该方法效果良好 .

Fault Tree Analysis (FTA) is an affective method from top to bottom, which can evaluate system reliability and safety. Failure Mode Effect and Criticality Analysis (FMECA) is a quantity reliability analysis from down to top. This paper combines the disadvantage between FTA and FMECA, finds the joints between FMECA and FTA of complex system. Before the joints, this paper presented the automatic transform algebra between the FMECA and FTA of sub fault tree, otherwise the computer aided dynamic fault tree method is established after the joints. The application of tree redundancy actuator of this method is content.