Composite Antidisturbance Control for Electromechanical Fin Actuators With Deflection Angle Constraints

In this article, a composite antidisturbance control method is proposed for electromechanical fin actuators with deflection angle constraints and multiple disturbances. First, a mathematical model considering multiple disturbances of the electromechanical fin actuators is established. Second, the closed-loop uncertainty quantification analysis is conducted using an experimental platform, revealing the influence mechanism of multiple disturbances. Third, a composite control scheme is designed based on the characteristics of the dominant disturbances, while accurately estimating, simultaneously compensating for, and attenuating these disturbances. Specifically, a multiharmonic disturbance observer is employed to precisely estimate the dominant disturbances, and a composite controller is developed to track the desired angle under deflection angle constraints. Finally, the experimental results demonstrate that, compared to the disturbance observer-based PID control and active disturbance rejection control, the proposed scheme can enhance both disturbance estimation accuracy and deflection angle tracking performance.