Abstract
In order to evaluate the mission success of system of systems (SoS) and to develop maintenance strategies to meet mission requirements of SoS, an importance measure method of equipment task based on operational dependency of SoS is proposed. The operational dependency network of SoS is constructed based on FDNA, and the nodes and dependency relationships in the network are determined. According to the Markov process, the reliability model of a system function is constructed, and the operability level and probability of each node in the network are obtained. Meanwhile, the algorithm of Birnbaum importance measure is introduced to effectively quantify the impact of operational dependency on the task importance of each equipment system in SoS. Finally, the feasibility and effectiveness of this method is verified by a case study.
Highlights
With the proposal of ‘‘network centric warfare’’, the complexity of combat system and combat mission is increasing
Each system in system of systems (SoS) often shows the independence of management and operation, but it must operate continuously without faults and achieve a group of overall capabilities to complete the corresponding tasks in the mission by cooperating with each other and playing different functions, which leads to the difference of the importance measures [7] of equipment system in different combat missions of SoS
Aiming at the common phenomenon that SoS has operational dependency in the process of mission execution, this paper improves Functional dependency network analysis (FDNA) to construct the operational dependency network of SoS, and puts forward an importance measure of equipment task based on operational dependency network; This paper determines a dynamic method of analyzing the operational levels of different nodes and their corresponding probability by using Markov process, and proposes analysis process of importance measure of equipment task in SoS by improving the Birnbaum importance measure
Summary
With the proposal of ‘‘network centric warfare’’, the complexity of combat system and combat mission is increasing. Based on the reference [41], in this paper the function weight coefficient ω and the criticality weight coefficient μ are introduced to improve the function of operability level based on criticality of dependency as follows: OCODij. Equation (22) is generally applicable to the case that the receiver node is a capability node. IMPORTANCE MEASURE OF EQUIPMENT TASK IN THE NETWORK The specific process of SoS performing combat mission can be transformed into the process of normal operation of equipment system functions to form the required task capabilities. Combat task execution is a dynamic process, and the task importance of equipment must change with the task time This paper improves the Birnbaum importance measure and proposes the importance measure of equipment task in the operational dependency network from the perspective of functional reliability analysis.
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