An observer-based adaptive fault-tolerant control for hypersonic vehicle with unexpected centroid shift and input...

Area of Science:

• Aerospace Engineering
• Control Systems Theory

Background:

• Hypersonic reentry vehicles (HSVs) face complex control challenges due to actuator failures and dynamic shifts.
• Unexpected center-of-mass movement introduces coupled uncertainties like varying inertia and eccentric torque, complicating control design.

Purpose of the Study:

• To develop an adaptive fault-tolerant control (FTC) strategy for HSVs.
• To address challenges posed by actuator failures, input constraints, and unknown center-of-mass shifts.

Main Methods:

• An adaptive observer combining fault and sliding-mode observers estimates system uncertainties.
• An adaptive FTC scheme utilizes estimated states, adaptive backstepping control, and auxiliary compensation for input saturation.
• Lyapunov stability theory ensures convergence and boundedness of closed-loop signals.

Main Results:

• The proposed FTC scheme effectively handles unknown system uncertainties and actuator failures.
• The adaptive observer successfully estimates detrimental unknown effects caused by centroid shifts.
• Simulation results validate the controller's effectiveness in maintaining attitude stability.

Conclusions:

• The developed adaptive FTC scheme provides robust control for HSVs under adverse conditions.
• The innovative observer design overcomes challenges associated with singular matrices due to centroid shifts.
• The approach ensures attitude tracking error convergence and overall system stability.