Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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Subject: search.filters.subject.Output feedback controllers

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Now showing 1 - 5 of 5
  • Article
    Citation - WoS: 6
    Citation - Scopus: 7
    On Adaptive Output Feedback Controf Robotic Manipulators With Online Disturbance Estimation
    (Springer Verlag, 2017) Aksoy, Orhan; Zergeroğlu, Erkan; Tatlıcıoğlu, Enver
    The problem of disturbance estimation and compensation for adaptive output feedback type controllers are investigated. Specifically two adaptive output feedback controllers designed for robotic manipulators are extended to compensate external disturbances which are common in robotic applications with repetitive task. The uncertain disturbance term in the robot dynamics is modeled as a fixed term plus a combination of sinusoidal signals. The overall stability and convergence of the tracking error for both controllers is ensured via Lyapunov based analysis. Extensive simulation studies are presented to illustrate the feasibility of the proposed method.
  • Article
    Citation - WoS: 6
    Citation - Scopus: 8
    A Model Independent Observer Based Output Feedback Tracking Controller for Robotic Manipulators With Dynamical Uncertainties
    (Cambridge University Press, 2017) Zergeroğlu, Erkan; Tatlıcıoğlu, Enver; Kaleli, Egemen
    In this work, we propose the development and the corresponding stability analysis of a novel, observer-based output feedback (OFB), tracking controller for rigid-link robot manipulators. Specifically, a model-independent variable-structure-like observer in conjunction with a desired dynamic compensation technique have been utilized to remove the link velocity dependency of the controller formulation. Asymptotic stability of the observer - controller couple is then guaranteed via Lyapunov-based arguments. An adaptive controller extension is also presented to illustrate the expansiveness of the proposed scheme. Experimental studies performed on a two-link planar robot with dynamical uncertainties are included in order to demonstrate the performance and feasibility of the proposed method.
  • Conference Object
    Citation - WoS: 6
    Citation - Scopus: 7
    Lyapunov-Based Output Feedback Learning Control of Robot Manipulators
    (Institute of Electrical and Electronics Engineers Inc., 2015) Doğan, Kadriye Merve; Tatlıcıoğlu, Enver; Zergeroğlu, Erkan; Çetin, Kamil
    This paper address the output feedback learning tracking control problem for robot manipulators with repetitive desired joint level trajectories. Specifically, an observer-based output feedback learning controller for periodic trajectories with known period have been proposed. The proposed learning controller guarantees semi-global asymptotic tracking despite the existence of parametric uncertainties associated with the robot dynamics and lack of velocity measurements. A learning-based feedforward term in conjunction with a novel observer formulation is designed to obtain the aforementioned result. The stability of the controller-observer couple is guaranteed via Lyapunov based arguments. Numerical studies performed on a two link robot manipulator are also presented to demonstrate the viability of the proposed method. © 2015 American Automatic Control Council.
  • Conference Object
    Citation - Scopus: 1
    Observer Based Output Feedback Control of Thrust Magnetic Bearings
    (Institute of Electrical and Electronics Engineers Inc., 2011) Okur, Beytullah; Zergeroğlu, Erkan; Tatlıcıoğlu, Enver; Başaran, Sinan; Sivrioğlu, Selim
    In this paper, we present an observer based output feedback controller for a thrust magnetic bearing system. A model independent variable structure like observer is used to determine the rotor velocity in order to remove the velocity dependency of the controller. The desired system dynamics have been utilized in the controller design and asymptotic stability of the observer-controller couple is guaranteed via Lyapunov based arguments. Experimental results are presented to illustrate the performance and feasibility of the proposed method. © 2011 IEEE.
  • Conference Object
    Citation - WoS: 6
    Citation - Scopus: 8
    Adaptive Output Tracking Control of a Surface Vessel
    (Institute of Electrical and Electronics Engineers Inc., 2008) Lee, Dongbin; Tatlıcıoğlu, Enver; Burg, Timothy C.; Dawson, Darren M.
    In this paper, the tracking control of a three degree-of-freedom marine vessel is examined. The novelty of this work is the transformation of the asymmetric inertia matrix into a symmetric, positive definite matrix. The asymmetry arises from the added mass common to practical surface vessels and creates a significant challenge for control design. The control design is further complicated by the parametric uncertainties in the dynamic model of the vessel. Two adaptive control schemes with a projection-based adaptation law are proposed: a full-state feedback controller and an output feedback controller. Both controllers are known to yield a uniformly ultimately bounded tracking result in the presence of parametric uncertainty. Numerical simulation results are shown to demonstrate the validity of the proposed controllers.