Reliability modeling and evaluation of cyber-physical system (CPS) considering communication failures

In this paper, a new evaluation method of reliability and security in cyber-physical system (CPS) considering communication failures is proposed based on instantaneous availability (IA) model and its fluctuation analysis. In this new method, IA model of CPS is established using the Markov process principle, and three types of system states, namely, working state, repairing state and delay-repairing state, are discussed from the perspective of reliability and security. On the basis of the locking error, the numerical solution of the model is solved by the fourth order Runge–Kutta method, and the instantaneous availability of the CPS is proved to be fluctuating. Finally, the impact of different parameters on the instantaneous availability of fluctuations and the ways to suppress fluctuations and improve the CPS reliability are obtained by analyzing the instantaneous availability of different parameters.