Reliability Assessment of Distributed Network Control System Based on Time Delay Evaluation

Based on the strict requirements of industrial applications for network real-time and reliability, this paper considers path performance correlation analysis using network delay parameters and evaluates the performance reliability of distributed network control systems (NCSs). The cumulative distribution function of the delay of each information transmission path in the system is constructed, and the reliability of the cluster path is analyzed utilizing multivariate Archimedean Copula functions (ACFs), which describes the path performance correlation, then the fitting effect of Copula function is evaluated by using the squared Euclidean distance method. Finally then the reliabilities of each subsystem and the whole system are calculated full probability formula. To simulate the time delay data of each path in the system, an OPNET-based distributed NCSs simulation platform is established. The reliability of distributed NCSs with 3 sub-systems is evaluated, and the effectiveness of the time delay-based performance reliability evaluation of the distributed NCSs is verified. The results is useful of network parameters optimization and improve the performance reliability of distributed NCS.