网络体系效能评估改进FDNA模型

doi:10.12305/j.issn.1001-506X.2022.12.17

Abstract

Abstract:

The effectiveness evaluation of network system of system (SoS) is the key issue of SoS construction and analysis. The traditional functional dependency network analysis (FDNA) method can show the "loose coupling" characteristics of the SoS, but it lacks attention to the operation independence, effectiveness attenuation, topology regularity and other characteristics of the component systems. In view of this, on the basis of considering the polymorphism problem, the self-effectiveness attenuation function and coefficient of component systems are defined through Markov process analysis, the fixed parameters in the traditional method are improved, and the dynamic effectiveness value of nodes is obtained. On the basis of defining the concept of the "relevant SoS", the importance of component system reliability is calculated, the key nodes are identified, and the network SoS effectiveness function is constructed. Taking the five-nodes aerospace SoS as an example, the effectiveness evaluation process is demonstrated and the feasibility of the method is verified.

Key words: network system of system (SoS), effectiveness evaluation, improved functional dependency network analysis (FDNA), Markov process, relevant SoS

CLC Number:

N945

Luyun QIU, Zhigeng FANG, Liangyan TAO, Qiucheng TAO. Effectiveness evaluation of network SoS based on improved FDNA model[J]. Systems Engineering and Electronics, 2022, 44(12): 3728-3737.

Figures/Tables 13

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序号	优点	缺点	改进方向
1	可分析组件系统或系统间链路的性能水平降级对于体系的连锁影响, 考虑了节点之间的依赖关系。	忽视了组件系统的独立运行、独立管理特性, 忽视了组件系统自主效能具有随机性、退化性等特征。	划分各组件系统的状态, 研究多态及稳态等问题, 求得自主效能衰减函数。
2	用节点的性能水平表示节点的效能值, 在0到100 utils (utils为效能单位)之间的固定参数, 易懂, 可操作性强。	效能结果单一性假设。未考虑时间的因素, 忽视了效能的动态性等特征。	引入时间变量, 在时间范围内考虑效能的变化。
3	可以求得组件系统的效能数值。	未考虑体系层面效能评估问题, 忽视了不同节点的重要度。	识别组件系统的关键性, 考虑不等权重问题。

参数设置	方法名称
参数设置	Garvey法	Guariniello法	张旺勋法	本文方法
计算公式	SOD_{O_ij}=α_ijO_i+ 100(1－α_ij)	SOD_{O_ij}=α_ijO_i+ SE_j(1－α_ij)	SOD_{O_ij}=[α_ijO_i+ 100(1－α_ij)]SE_j%	$ \left\{\begin{array}{l} \operatorname{SOD}_{O_{i j}}(t)=\left[\alpha_{i j} O_i(t)+\mathrm{SE}_j\left(1-\alpha_{i j}\right)\right] \eta_n^j(t) \\ \eta_n^j(t)=\frac{\mathrm{SE}_j+\mathrm{DoSE}_n^j(t)}{\mathrm{SE}_j} \times 100 \% \end{array}\right.$
O_i=100 SE_j=100	O_j=100	O_j=100	O_j=100	O_j(0)=100, O_j(5)=94.97, O_j(10)=89.91
O_i=100 SE_j=50	O_j=100	O_j=95	O_j=50	O_j(0)=95, O_j(5)=85.45, O_j(10)=75.83
O_i=100 SE_j=0	O_j=100	O_j=90	O_j=0	O_j(0)=0, O_j(5)=0, O_j(10)=0
O_i=50 SE_j=100	O_j=55	O_j=55	O_j=55	O_j(0)=55, O_j(5)=52.23, O_j(10)=49.45
O_i=0 SE_j=100	O_j=10	O_j=10	O_j=10	O_j(0)=10, O_j(5)=9.48, O_j(10)=8.99
O_i=60 SE_j=30	O_j=64	O_j=57	O_j=19.2	O_j(0)=57, O_j(5)=47.45, O_j(10)=37.83

效能参数/utils	组件系统
效能参数/utils	N₁	N₂	N₃	N₄	N₅
SE_j	90	80	95	90	75
DoSE₀^j(2)	-7.65	-10.62	-9.21	-2.37	-8.82
SE_j－DoSE₀^j(2)	82.35	69.38	85.79	87.63	66.18
O_j(2)	82.35	70.3	77.96	84.28	70.36
g^j	-5.36	-7.35	-6.11	-2.58	-5.69

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Effectiveness evaluation of network SoS based on improved FDNA model

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