Robust control of post-stall pitching maneuver based on finite-time observer

Area of Science:

• Aerospace Engineering
• Control Systems Theory
• Nonlinear Dynamics

Background:

• Aircraft attitude control is challenged by unsteady aerodynamic disturbances and input saturation.
• Accurate estimation of these disturbances and compensation for saturation are critical for robust control.

Purpose of the Study:

• To develop a robust finite-time maneuver control scheme for aircraft longitudinal attitude dynamics.
• To address the challenges posed by unsteady aerodynamic disturbances and input saturation.

Main Methods:

• Design of nonlinear finite-time observers to estimate unmeasurable aerodynamic disturbances.
• Construction of a finite-time auxiliary system to compensate for input saturation effects.
• Development of a robust finite-time backstepping attitude control strategy integrating observers and auxiliary system.

Main Results:

• Finite-time estimation of unsteady aerodynamic disturbances despite nonlinearities and coupling.
• Effective compensation for input saturation through the auxiliary system.
• Demonstrated finite-time convergence of all closed-loop system signals via Lyapunov analysis.

Conclusions:

• The proposed robust finite-time control scheme effectively handles unsteady aerodynamic disturbances and input saturation.
• The developed nonlinear observers and auxiliary system ensure precise estimation and compensation.
• Simulation results validate the effectiveness of the attitude control approaches for aircraft.