Adaptive event-triggered security control for nonlinear CPS under DoS attack

This research studies the co-designing security control and adaptive event-triggered communication for a nonlinear CPS that experiences DoS attacks and actuator faults. First, a new communication scheme that adjusts adaptively to events is developed, and the threshold for triggering this scheme dynamically varies based on the state of the system, resulting in a more efficient utilization of network communication resources. Additionally, utilizing ADETCS as a foundation, a structure for safeguarding nonlinear CPS is constructed. Thirdly, the assistance of Lyapunov theory, time delay system theory and less conservativeness techniques are utilized, a observer is designed to observe the estimation of state and fault in real time, along with a security controller to ensure tolerance against attacks and faults. Finally, the simulation case of the classical quadruple-tank model is adopt to verify the viability and efficiency of the proposed approach.