Observer-based event-triggered output feedback control for fractional-order cyber-physical systems subject to stochastic network attacks

Abstract

This paper is engaged in investigating the observer-based event-triggered output feedback control issue for fractional-order cyber-physical systems with stochastic network attacks, where the order scale of the fractional derivative used is 0<α<1. An event-triggered scheme (ETS) with output-independent threshold is proposed to renew the observer input so as to reduce the redundant data communications. Considering the effects of the ETS and network attacks, a novel closed-loop fractional-order control system model is constructed. By making use of fractional-order Lyapunov indirect approach, sufficient conditions that can insure the global stochastic asymptotic stability of the established closed-loop control system are obtained. Moreover, according to the singular value decomposition (SVD) of matrix, the co-design of the gains of the desired observer and controller is addressed by finding the solution of the linear matrix inequalities (LMIs). Finally, a numerical example and a diesel engine control system are provided to validate the feasibility of the adopted observer-based control method.

Keywords: Event-triggered scheme; Fractional-order cyber–physical systems; Observer-based output feedback control; Stochastic network attacks.