Event-triggered adaptive attitude control for flexible spacecraft with actuator nonlinearity

摘要

This paper investigates the attitude control problem for flexible spacecraft subject to actuator deadzone under event-trigger mechanism. An event-triggered mechanism is evolved to reduce the communication resource of the sensor to controller channel, which adopts a switching threshold strategy to exclude the Zeno phenomenon fundamentally. In order to address the model nonlinear dynamics, the fuzzy logic systems is employed based on the event-triggered sensor measurements. In addition, the actuator deadzone is modeled as sector nonlinearity, which can be compensated by event-triggered adaptive scheme. It is shown that the proposed adaptive controller can reject the measurement errors induced by event-triggered scheme, the unknown model/actuator nonlinearity, and the external disturbances effectively, such that the attitude stabilization objective can be ultimately achieved. Finally, the simulation results are presented to verify the feasibility of the proposed event-triggered control law. (C) 2020 Elsevier Masson SAS. All rights reserved.