多态防护系统可靠性及重要度分析

在装备防护系统中,系统中的所有部件都可能会受到攻击,为了降低攻击成功的概率,部件的防护层有多个状态,从完全失效状态到完好状态,部件的防护功能依次增加。本文分析了部件防护层的状态变化规律,研究了当部件受到攻击存活和故障时的平均性能变化机理。然后基于系统结构函数,分别给出了防护层的Birnbaum重要度和综合重要度,分析了当部件防护层的状态发生变化时,系统性能的变化规律和特性;并考虑部件防护层的状态转移率,分析了在多种状态变化情况下的防护层提升对系统性能的影响。最后针对某直升机的航空动力装置系统,分析了不同部件防护层对系统性能的影响,并比较了Birnbaum重要度和综合重要度的不同,验证了提出方法的正确性和有效性。

System Reliability and the Importance Analysis in Multi-state Protection Systems

In the protection system, all the components may be attacked. In order to reduce the probability of the attack success, the protective layer of a component has multiple states, and the protection function of the component increases from the complete failure state to the perfect state. This paper analyzes the state change of component protection layer, and studies the mechanism of the system performance change when components are attacked. Then, based on the system structure function, the Birnbaum importance and the integrated importance measures of the protective layer are given respectively. The change and characteristics of the system performance are analyzed when the states of the protective layer change. Considering the state transition rate of the protective layer, the influence of the protection layer on the system performance is analyzed. At last, a helicopter system is used to analyze the influence of the protective layer of different parts on the system performance. The differences between the Birnbaum importance and the integrated importance measures are compared, and the correctness and effectiveness of the proposed method are verified.