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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/33545

Title: Magnetic Attitude Control For Spacecraft with Flexible Appendages
Authors: Stellini, Julian
Advisor: Damaren, Christopher John
Department: Aerospace Science and Engineering
Keywords: aerospace
magnetic attitude control
attitude control
flexible spacecraft
spacecraft attitude control
control of flexible appendages
spacecraft control
magnetic control
geomagnetic field
aerospace control
aerospace engineering
spacecraft dynamics
dynamics and control
Issue Date: 27-Nov-2012
Abstract: The design of an attitude control system for a flexible spacecraft using magnetic actuation is considered. The nonlinear, linear, and modal equations of motion are developed for a general flexible body. Magnetic control is shown to be instantaneously underactuated, and is only controllable in the time-varying sense. A PD-like control scheme is proposed to address the attitude control problem for the linear system. Control gain limitations are shown to exist for the purely magnetic control. A hybrid control scheme is also proposed that relaxes these restrictions by adding a minimum control effort from an alternate three-axis actuation system. Floquet and passivity theory are used to obtain gain selection criteria that ensure a stable closed-loop system, which would aid in the design of a hybrid controller for a flexible spacecraft. The ability of the linearized system to predict the stability of the corresponding nonlinear system is also investigated.
URI: http://hdl.handle.net/1807/33545
Appears in Collections:Master

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