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dc.contributor.advisorKarpenko, Mark
dc.contributor.authorWojdakowski, Steven W.
dc.dateSep-15
dc.date.accessioned2015-11-06T18:22:56Z
dc.date.available2015-11-06T18:22:56Z
dc.date.issued2015-09
dc.identifier.urihttp://hdl.handle.net/10945/47347
dc.description.abstractThis thesis addresses the problem of computing rapid slew maneuvers for a spacecraft antenna mounted on a double-axis gimbal with elastic joints. The performance of the system can be enhanced by designing antenna maneuvers in which the flexible effects are properly constrained, thus reducing the load on the spacecraft control system. The motion of a mass-spring-damper system is shown to be analogous to a spacecraft antenna slew with linear dynamics. This model is extended to a nonlinear double-gimbal mechanism with flexible joints, which better represents real spacecraft antenna dynamics. Rather than increase maneuver times to control flexible motion, this thesis presents optimal solutions that decrease maneuver times while allowing designers to easily constrain flexibility. Since it is impossible to recast the nonlinear system into a modal representation, an innovative approach is used to map the nonlinear dynamics into a linear system with a fictitious force. The fictitious force captures the effects of the nonlinearities so the vibrational motion can be constrained for a time-optimal slew. It is shown that by constructing an appropriate optimal control problem, the maneuver time for a flexible DGM can be decreased by approximately 42% compared to a conventional computed torque control solution.en_US
dc.description.urihttp://archive.org/details/rapidslewingoffl1094547347
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleRapid slewing of flexible space structuresen_US
dc.typeThesisen_US
dc.contributor.secondreaderRoss, I. Michael
dc.contributor.departmentMechanical and Aerospace Engineeringen_US
dc.contributor.departmentMechanical and Aerospace Engineering (MAE)
dc.subject.authormultibody systemsen_US
dc.subject.authormodal analysisen_US
dc.subject.authoroptimal controlen_US
dc.subject.authorsatelliteen_US
dc.subject.authorflexible space structureen_US
dc.subject.authormaneuver designen_US
dc.subject.authorslew designen_US
dc.description.recognitionOutstanding Thesisen_US
dc.description.serviceMajor, United States Armyen_US
etd.thesisdegree.nameMaster of Science in Astronautical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineAstronautical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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