Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

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

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Now showing 1 - 4 of 4
  • Conference Object
    Citation - WoS: 28
    Citation - Scopus: 34
    A New Robust 'integral of Sign of Error' Feedback Controller With Adaptive Compensation Gain
    (Institute of Electrical and Electronics Engineers Inc., 2013) Bıdıklı, Barış; Tatlıcıoğlu, Enver; Bayrak, Alper; Zergeroğlu, Erkan
    In this paper, a new robust integral of signum of error (RISE) feedback type controller is designed for a class of uncertain nonlinear systems. Unlike the previous versions of RISE feedback type controllers, the proposed controller does not require prior knowledge of upper bounds of the vector containing the uncertainties of the dynamical system plus desired system dynamics (and their derivatives) for the control gain selection. The aforementioned enhancement is made possible via the design of a time-varying compensation gain as opposed to a constant gain used in previous RISE feedback type controllers. Asymptotic stability of the error signals and the boundedness of the closed-loop system signals are ensured via Lyapunov based arguments. Numerical simulation studies are presented to illustrate the viability of the proposed method. ©2013 IEEE.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 8
    Online Time Delay Identification and Control for General Classes of Nonlinear Systems
    (SAGE Publications Inc., 2013) Bayrak, Alper; Tatlıcıoğlu, Enver
    In this study, online identification of state delays is discussed. First, a novel adaptive time delay identification technique is proposed for general classes of nonlinear systems subject to state delays. The stability of the time delay identification algorithm is analyzed via Lyapunov-based techniques. In this work, we consider the time delay as a nonlinear parameter effecting the system which is a seemingly novel departure from the existing literature. As an extension, this technique is modified to design a tracking controller for general classes of nonlinear systems subject to state delays. The main novelty of this controller is that identification of unknown state delays are ensured while output tracking objective is satisfied. Numerical simulations are conducted that demonstrate the efficiency of the time delay identification algorithm and the tracking controller.
  • Conference Object
    Citation - WoS: 3
    Citation - Scopus: 6
    Online Time Delay Identification and Control for General Classes of Nonlinear Systems
    (Institute of Electrical and Electronics Engineers Inc., 2012) Bayrak, Alper; Tatlıcıoğlu, Enver
    In this study, online identification of state delays is discussed. First, a novel adaptive time delay identification technique is proposed for general classes of autonomous nonlinear systems subject to state delays. As an extension, this technique is modified to design a tracking controller for general classes of nonlinear systems subject to state delays. The main novelty of this controller is that identification of unknown state delays is ensured while output tracking objective is satisfied. Extensive numerical simulations are presented that demonstrate the efficiency of the time delay identification algorithm and the tracking controller. © 2012 IEEE.
  • Conference Object
    Filter-based control for parallel plate micro electrostatic actuators
    (Institute of Electrical and Electronics Engineers Inc., 2011) Salah, Mohammed H.; Bayrak, Alper; Tatlıcıoğlu, Enver
    In this paper, a filter-based nonlinear control strategy for parallel-plate micro electrostatic actuators is designed. The proposed control technique utilizes the measurements of the micro actuator's movable plate displacement and the device internal charge. The information of the micro actuator's movable plate velocity is utilized as well in the control synthesis but since it is difficult to be measured, filtered signals are designed and utilized to facilitate the control development. A Lyapunov-based analysis is presented which proves that a desired time-varying displacement of the micro actuator's movable plate is accurately tracked. The proposed nonlinear controller is capable of controlling the movable plate beyond the pull-in boundary that is one third of the capacitive gap. Representative numerical simulations are introduced to demonstrate the performance of the proposed filter-based nonlinear control strategy in accurately tracking the deflection of the micro electrostatic movable plate within the entire capacitive gap. Finally, a comparison with a standard PID controller is also presented to demonstrate the effectiveness of the proposed control design. © 2011 IEEE.