Extended state observer based control for generic hypersonic vehicles with nonaffine-in-control character

Area of Science:

• Aerospace Engineering
• Control Systems Theory
• Hypersonic Flight Dynamics

Background:

• Hypersonic vehicles present complex flight control challenges due to nonaffine-in-control dynamics.
• Significant uncertainties and external disturbances impact vehicle stability and trajectory tracking.
• Existing control strategies often require extensive aerodynamic knowledge, limiting adaptability.

Purpose of the Study:

• To develop a robust flight control scheme for generic hypersonic vehicles.
• To address the nonaffine-in-control problem and mitigate external disturbances.
• To achieve accurate trajectory tracking with reduced reliance on aerodynamic models.

Main Methods:

• Utilizing an extended state observer (ESO) to estimate system states and total disturbance.
• Implementing a backstepping design procedure combined with dynamic inversion.
• Developing a disturbance observer-based control (DOBC) strategy.

Main Results:

• The proposed control scheme effectively estimates states and disturbances using the ESO.
• Dynamic inversion within the backstepping framework successfully handles nonaffine dynamics.
• Numerical simulations demonstrate robust tracking performance under various conditions.

Conclusions:

• The developed control strategy ensures stable hypersonic vehicle flight despite uncertainties and disturbances.
• The method achieves precise trajectory tracking with minimal prior aerodynamic information.
• The approach offers a promising solution for advanced hypersonic vehicle control systems.