Robust Higher-Order Super-Twisting Control of Aeroelastic System with Unsteady Aerodynamics

摘要

This paper presents a robust higher-order super-twisting control system for finite-time control of an aeroelastic system. The model includes unsteady aerodynamics, nonlinear structural nonlinearities, parametric uncertainties, and external disturbance input (gust load). The model describes the nonlinear plunge and pitch dynamics of a prototypical wing section. The uncontrolled system exhibits limit cycle oscillations (LCOs). Objective is to design a robust control law for suppressing the oscillatory responses using a single trailing-edge control surface. A robust super-twisting continuous control law is designed for the trajectory control of the pitch angle. The control system includes a finite-time stabilizing control signal for the system without uncertainties, and a control signal for nulling the effect of the gust load and parametric uncertainties. In the closed-loop system, the controller achieves finite-time control of the pitch angle trajectory, and its derivative. Also the oscillations in responses are suppressed. Simulation results are presented to show suppression of the LCOs, despite unsteady aerodynamics, parameter uncertainties, and gust load.