Passification-Based Adaptive Control of Spacecraft With Elastic Appendages
AIAA Scitech 2020 Forum
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The development of a new simple adaptive control system for the control of a spacecraft with flexible appendages, based on output feedback passification, is the subject of this paper. It is assumed that the parameters of the orbiting spacecraft are unknown. The objective is to control the pitch angle and stabilize the elastic modes, using a single moment producing device, located on the central rigid body. An adaptive control system is designed for the trajectory control of the pitch angle. It is shown by the Lyapunov analysis that in the closed-loop system-including the passification-based control law-the pitch angle asymptotically converges to the target value and the elastic modes converge to the equilibrium point. Interestingly, the control system resembles a PID (proportional-integral-derivative) controller. But here, its gains are tuned using the adaptation law to compensate for uncertainties in the model. For synthesis, only the pitch angle and pitch rate are measured. Simulation results show that this simple adaptive law can accomplish precise large rotational maneuvers and vibration suppression, despite large parameter uncertainties and disturbance input in the spacecraft model.
Flexible spacecraft; Attitude control; Finite-time stability
Aerospace Engineering | Engineering | Space Vehicles
Lee, K. W.,
Singh, S. N.
Passification-Based Adaptive Control of Spacecraft With Elastic Appendages.
AIAA Scitech 2020 Forum, 1