关键词: 安全系统工程, 空间故障树, 云模型, 云化特征函数

Abstract: In order to expand the theoretical framework of space fault tree, and solve the complex problem of construction and calculation the characteristic function as the basis of the framework, the cloud model is used to construct the characteristic function, and form the cloud characteristic function, and then provide the basis for the cloud SFT. This paper analyzes the shortcomings of the existing characteristic function, and discusses the feasibility of using the cloud model to construct the feature function. The basic steps are: firstly, the component reliability data considering a factor is input into the reverse cloud model generator, and then the characteristic parameters are obtained. Secondly, the parameters are brought the analytic formula of positive model. Finally, the analytic formula is reduced of 1 as the cloud characteristic function of the factor. The cloud component failure probability distribution and cloud system failure probability distribution are constructed by using the cloud characteristic function. The cloud concepts based on the given example are calculated, which indicates that the results are inherited from the characteristics of the cloud model, and it is suitable for SFT analysis.

Key words: Safety system engineering, space fault tree, cloud model, cloud characteristic function