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Date of Award

Spring 2005

Document Type

Thesis - Open Access

Degree Name

Master of Science in Space Science

Department

Physical Sciences

Committee Chair

Dr. Mahmut Reyhanoglu

Committee Member

Dr. Bereket Berhane

Committee Member

Dr. Robert Fleck

Abstract

Slew-maneuver control problem is studied for a flexible spacecraft consisting of a rigid main body to which a long flexible appendage is attached. Nonlinear dynamical system models are developed using both distributed parameter modeling and discrete parameter modeling; these models are shown to be equivalent for appropriately chosen system parameters. Lyapunov-based nonlinear feedback controllers are designed for the control of rigid-body motion while suppressing the lowest frequency vibrational mode. In case of large-angle maneuvers, these nonlinear controllers are shown to outperform the linearization-based controllers including the filtered proportional-derivative (PD) controllers as well as the linear quadratic regulator (LQR) controllers. Finally, the theoretical development is applied to a benchmark flexible system and a number of computer simulations are included to illustrate the results.

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