Browsing by Subject "PID controllers"
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Item Open Access A new PI and PID control design method for integrating systems with time delays: applications to AQM of TCP flows(World Scientific and Engineering Academy and Society (WSEAS), 2007-02) Üstebay, Deniz; Özbay, Hitay; Gündeş, N.Allowable PI and PD controller gains for a class of unstable MIMO systems with input/output delays have been investigated in [5, 12]. Using the results of these studies, we propose a new method for tuning the parameters of PI and PID controllers for integrating processes with time delays. As an application of this method, we design PI and PID controllers for Active Queue Management,of TCP flows and illustrate performance,of these controllers by packet level simulations in ns-2. Key‐Words: PID Controllers, Time Delay, Integrating Processes, Active Queue ManagementItem Open Access On stabilizing with PID controllers(IEEE, 2007-06) Saadaoui, K.; Özgüler, A. BülentIn this paper we give an algorithm that determines the set of all stabilizing proportional-integral-derivative (PID) controllers that places the poles of the closed loop system in a desired stability region S. The algorithm is applicable to linear, time invariant, single-input single-output plants. The solution is based on a generalization of the Hermite-Biehler theorem applicable to polynomials with complex coefficients and the the application of a stabilizing gain algorithm to three auxiliary plants. ©2007 IEEE.Item Open Access PID controller design for fractional-order systems with time delays(Elsevier, 2011-11-22) Özbay, Hitay; Bonnet, C.; Fioravanti, A.R.Classical proper PID controllers are designed for linear time invariant plants whose transfer functions are rational functions of sα, where 0<α<1, and s is the Laplace transform variable. Effect of inputoutput time delay on the range of allowable controller parameters is investigated. The allowable PID controller parameters are determined from a small gain type of argument used earlier for finite dimensional plants.Item Open Access PID controller synthesis for a class of unstable MIMO plants with I/O delays(Elsevier, 2006-07) Gündeş, A. N.; Özbay, Hitay; Özgüler, A. BülentConditions are presented for closed-loop stabilizability of linear time-invariant (LTI) multi-input, multi-output (MIMO) plants with I/O delays (time delays in the input and/or output channels) using PID (Proportional + Integral + Derivative) controllers. We show that systems with at most two unstable poles can be stabilized by PID controllers provided a small gain condition is satisfied. For systems with only one unstable pole, this condition is equivalent to having sufficiently small delay-unstable pole product. Our method of synthesis of such controllers identify some free parameters that can be used to satisfy further design criteria than stability. Copyright © 2006 IFAC.Item Open Access Reliable decentralised control of delayed MIMO plants(Taylor & Francis, 2010-03) Gündeş, A. N.; Özbay, HitayReliable decentralised proportional-integral-derivative controller synthesis methods are presented for closed-loop stabilisation of linear time-invariant plants with two multi-input, multi-output (MIMO) channels subject to time delays. The finite-dimensional part of plants in the classes considered here are either stable or they have at most two poles in the unstable region. Closed-loop stability is maintained with only one of the two controllers when the other controller is turned off and taken out of service.Item Open Access Switching resilient PI controllers for active queue management of TCP flows(IEEE, 2007) Üstebay, Deniz; Özbay, HitayActive Queue Management (AQM) is used in computer networks to increase link utilization with less queueing delays. The fluid flow model or TCP based on delay differential equations supplies the mathematical background for modelling the AQM as a feedback system. Recently various PI and PID controllers arr designed for this feedback system, [7], [18]. In this paper, we consider the case for which the Round Trip Time (RTT) is time varying and we propose switching resilient PI controllers using the design method introduced in [18].Item Open Access Tracking and regulation control of a 2-DOF robot arm with unbalance(IEEE, 2012-08) Güler, Samet; Özgüler, A. BülentServomechanism synthesis for a two degree-of-freedom robot arm assembled on a vessel and affected from sea disturbances is considered. Dynamic equations of the robot arm with unbalance and of an approximate base disturbance model are derived. Direct linear controller synthesis based on a linearized model is then studied. It is shown that, although the plant model is nonlinear, linear controller that is synthesized based on the "internal model principle" provide good performance and perform better than the commonly used PID controllers. © 2012 IEEE.