连续型空间故障树中因素重要度分布的定义与认知

Definition and cognition of factor important degree distribution in continuous space fault tree

为了解工作环境条件因素对系统故障概率的影响的特征,同时丰富连续型空间故障树(CSFT)的理论框架,提出因素重要度分布的概念。因素重要度分布从经典故障树的概率重要度发展而来,目的是研究系统所处环境因素变化导致系统可靠性变化的程度。给出元件和系统的因素重要度分布概念、公式及所需基础数据,并分析因素重要度分布的正负分布特点。使用该概念研究元件X1和系统T的因素t重要度分布和因素c重要度分布。结果表明:在不同环境中,对于因素t或c变化影响元件或系统的故障概率变化程度是不同的。因素重要度分布有效地表达了t和c对元件或系统的故障概率影响特征。

In order to understand characteristics of influence of characteristics of working environment conditions on system failure probability,and rich the theoretical framework of CSFT,a concept of factor importance distribution was introduced. The concept was developed based on the probability importance of classical fault tree. Its purpose is to research the sensitivity of system reliability to environment factors.Concepts of factor importance distribution were given for components and system. Related formulas and data were obtained. The characteristics of positive and negative distribution of factor importance distribution were analyzed. With the concept,the importance distributions of factor c and t of component X1 and system T were studied. The results show that in the different environments,the factors t and c have different effects in degree on failure probability level of component and system,and that factor importance distribution effectively expresses the characteristics of influence of factors t and c on system failure probability.