不完全覆盖系统的动态故障树定量分析方法

Quantitative method of dynamic fault tree analysis for imperfect coverage system

针对含备份结构的动态系统可靠性分析以及不完全覆盖问题,提出了一种温备份门的可靠性计算方法。该方法引入阶梯函数和脉冲函数来描述备份结构的动态失效特征,在考虑不完全覆盖的基础上计算了温备份门的可靠性,最后以某机载电子设备为例,建立了系统的动态故障树,论证了该方法的可行性,并与不考虑不完全覆盖的方法进行了比较,同时对系统进行了灵敏度分析,该方法计算结果更合理,为动态系统可靠性定量分析奠定了一定基础。

In order to efficiently perform reliability analysis for imperfect coverage system which contains standby units that make the dynamic fault tree analysis very complicated, a quantitative reliability analysis method applied to warm spare gate is proposed. The step function and impulse function are introduced to de- scribe the dynamic failure characteristics of standby units. Then, considering the dynamic system with imper- fect coverage, the paper deduces the formulas for calculating the reliability of warm spare gate. Finally, an airborne electronic device as an example illustrates the feasibility of the method by establishing system dynamic fault tree. Compared to the existing method without consideration of imperfect coverage, combined with system sensitivity analysis, the computational result of the proposed method is more rational and provides a novel foundation for further research on reliability quantitative analysis.