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dc.contributor.advisorÖzbay, Hitay
dc.contributor.authorAhmed, Saeed
dc.date.accessioned2018-07-30T06:54:27Z
dc.date.available2018-07-30T06:54:27Z
dc.date.copyright2018-07
dc.date.issued2018-07
dc.date.submitted2018-07-24
dc.identifier.urihttp://hdl.handle.net/11693/47691
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (Ph.D.): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2018.en_US
dc.descriptionIncludes bibliographical references (leaves 94-104).en_US
dc.description.abstractWe study observer design and output feedback stabilization of switched and nonlinear time varying systems. To establish the stability of feedback switched systems with delay, we develop a new extension of a recently proposed trajectory based approach which is fundamentally different from classical Lyapunov function based methods. This new extension of trajectory based approach, which is of interest for its own sake, can be applied to a wide range of time varying systems with time varying delays and it tackles the issue of finding appropriate Lyapunov functions to establish stability results. Our stabilization methodology does not require stabilizability and detectability of all of the subsystems of the switched system and we do not impose any constraint on the derivative of the time varying delay. For nonlinear time varying systems, we build a new type of finite-time smooth observer in the case where a state dependent disturbance affects the linear approximation. We combine this finite time observer design and a switched systems approach to develop stabilizing feedbacks for nonlinear time varying systems whose outputs are only available on some finite time intervals. Again, we use an extension of the trajectory based approach to conclude the stability of the closed-loop system. Motivated by the fact that the measured components of the state do not need to be estimated, we also construct reduced order finite time observers for a broad class of nonlinear time varying systems. We show how these reduced order finite time observers can be used to solve dynamic output feedback stabilization problem for multiple input, multiple output nonlinear time varying systems. Finally, we design a finite time observer to estimate the exact state of a continuous-time linear time varying system from sampled output in the presence of a piecewise continuous disturbance.en_US
dc.description.statementofresponsibilityby Saeed Ahmed.en_US
dc.format.extentix, 110 leaves ; 30 cm.en_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectObserveren_US
dc.subjectOutput Feedbacken_US
dc.subjectStabilizationen_US
dc.subjectSwitched Systemen_US
dc.subjectNonlinear Systemen_US
dc.subjectDelayen_US
dc.subjectTime Varyingen_US
dc.titleObserver design and output feedback Stabilization of time varying systemsen_US
dc.title.alternativeZamanla değişen sistemlerin gözlemleyici tasarımı ve çıktı geribeslemesien_US
dc.typeThesisen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.publisherBilkent Universityen_US
dc.description.degreePh.D.en_US
dc.identifier.itemidB158728
dc.embargo.release2021-08-01


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