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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 the characteristics of the influence of working environment conditions on system failure probability and to enrich the theoretical framework of CSFT, the concept of importance distribution of factors is proposed. The importance distribution of factors evolves from the probability importance of classical fault trees in order to study the extent to which system reliability changes due to the change of environmental factors in the system. The concepts, formulas and necessary basic data of importance distribution of components and systems are given, and the positive and negative distribution of the importance distribution of factors is analyzed. This concept is used to study the factor t importance distribution and the factor c importance distribution of component X1 and system T. The results show that in different environments, the degree of failure probability changes of components or systems that are affected by the change of factor t or c are different. The factor importance distribution effectively expresses the influence of t and c on the probability of failure of a component or system.