Fault-tolerant control for vessel systems with intermittent constraints and event-triggered mechanism
摘要
This research focuses on the problem of tracking with intermittent output constraints under external disturbances by presenting a novel fault-tolerant control methodology for surface ship systems. To optimize resource usage, a dynamic memory event-triggered mechanism (DMETM) is introduced that features a longer triggering interval compared to traditional mechanisms, which helps implement the proposed control scheme. Since the given output constraints differ from ordinary continuous constraints, the quadratic and log-type Lyapunov functions are used to convert the constrained and unconstrained systems by introducing an auxiliary switching function. Furthermore, different actuator defects are efficiently handled by the fault-tolerant control. By selecting appropriate design parameters, the suggested control scheme ensures all system signals in the closed-loop are bounded and the tracking error remains within a small range near zero, without violating the output constraints. A simulation example demonstrates the effectiveness of the proposed approach.