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dc.contributor.advisorAkella, Maruthi Ram, 1972-
dc.creatorOkamoto, Makiko, active 2014
dc.date.accessioned2017-07-12T14:06:03Z
dc.date.available2017-07-12T14:06:03Z
dc.date.issued2007-05
dc.identifierdoi:10.15781/T2FT8F04Q
dc.identifier.urihttp://hdl.handle.net/2152/60388
dc.description.abstractIn this thesis, we consider two adaptive control problems containing unknown 2×2 or 3×3 orthogonal matrices. The first one refers to the adaptive control problem for systems with unknown drift vector directions where the certainty-equivalence principle can be applied with overparameterization. The second one refers to the adaptive control problem for drift-free systems with unknown control directions where the certainty-equivalence principle cannot be applied without making other assumptions such as satisfaction of restrictive matching conditions. For both these adaptive control problems, we propose new non-certainty equivalent adaptive controllers that ensure asymptotic convergence of the tracking error to the origin for most initial conditions while simultaneously enforcing orthogonality on the matrix estimate for all time. In addition to stability proofs, numerical simulations are presented to illustrate the closed-loop performance of the resulting controller designs.en_US
dc.format.mediumelectronicen_US
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.subjectAdaptive control problemsen_US
dc.subjectOrthogonal matricesen_US
dc.subjectController designen_US
dc.titleAdaptive control schemes for systems with unknown drift and control directionsen_US
dc.typeThesisen_US
dc.description.departmentAerospace Engineeringen_US
dc.type.genreThesisen_US
thesis.degree.departmentAerospace Engineeringen_US
thesis.degree.disciplineAerospace Engineeringen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
dc.rights.restrictionRestricteden_US


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