Author

Ying Si

Date of Award

8-20-2021

Document Type

Dissertation - SCU Access Only

Publisher

Santa Clara : Santa Clara University, 2021.

Degree Name

Master of Science (MS)

First Advisor

Mohammad Ayoubi

Abstract

This thesis presents a novel fuzzy controller for the attitude tracking problem of a spacecraft with uncertain reaction wheel friction disturbances. First, a Takagi-Sugeno (T-S) fuzzy model is constructed for a spacecraft with reaction wheels using the sector nonlinearity method. Then, the T-S model is used with the Twin-Parallel Distributed Compensation (TPDC) technique to cast the tracking problem of gyrostat (spacecraft with reaction wheels) in the form of linear matrix inequalities (LMIs). Furthermore, the spacecraft's body-rates and reaction wheels' momentum constraints are considered in the formulation. The control feedback gains for the attitude and reaction wheel speed control are obtained by solving the set of linear matrix inequalities. The global stability of the closed-loop system with the proposed control strategy is guaranteed by the Lyapunov stability theorem. In the end, the efficacy and performance of the proposed attitude tracing controller are examined via numerical simulations. The TPDC tracks and stabilizes the spacecraft to any desired state in the presence of parameter uncertainties and external disturbances while satisfying actuator constraints.

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