Yazar "Cokmez, Erdal" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • [ X ]
    Öğe
    Cascade Control Approach for a Cart Inverted Pendulum System Using Controller Synthesis Method
    (Ieee, 2018) Peker, Fuat; Kaya, Ibrahim; Cokmez, Erdal; Atic, Serdal
    Inverted pendulum is a basic benchmark in the field of control engineering. It is a well-known example of single input multi output (SIMO) systems. A commonly used type of the inverted pendulum systems is cart inverted pendulum which has a cascade structure inherently. In this paper, a cascade control approach based on controller synthesis method is used for controlling a cart inverted pendulum system. Controller synthesis technique is used to tune both inner and outer loops of the cascade control system. Simulation results are given to demonstrate the use of the proposed approach.
  • [ X ]
    Öğe
    Fractional order PI-PD controller design for time delayed processes
    (Pergamon-Elsevier Science Ltd, 2024) Cokmez, Erdal; Kaya, Ibrahim
    In this study, a method for modifying the settings of fractional order PI-PD (FOPI-PD) controllers to handle time-delayed stable, unstable, and integrating processes is presented. The goal is to reduce the computational complexity associated with fractional controller design using analytical techniques. The approach involves updating the analytical weighted geometrical center (AWGC) method for tuning FOPI-PD controllers. The fractional integral and derivative orders are computed by minimizing the Integral of Squared Time Error (ISTE) using straightforward formulas. Additionally, there are analytical formulas provided for robustness characteristics such as maximum sensitivity (Ms), phase margin (PM), and gain margin (GM). The effectiveness of the technique is illustrated through unit-step responses under nominal, disturbed, and measurement situations. The method was evaluated using various metrics and an inverted pendulum mechanical system to demonstrate its industrial applicability. The results showed satisfactory outcomes in both performance and robustness.
  • [ X ]
    Öğe
    Fractional-order PI Controller Design for Integrating Processes Based on Gain and Phase Margin Specifications
    (Elsevier, 2018) Cokmez, Erdal; Atic, Serdal; Peker, Fuat; Kaya, Ibrahim
    Fractional-order PID controllers have been introduced as a general form of conventional PID controllers and gained considerable attention latterly due to the flexibility of two extra parameters (fractional integral order and fractional derivative order la) provided. Designing fractional controllers in the time domain has still difficulties. Moreover, it has been observed that the techniques based on gain and phase margins existing in the literature for integer-order systems are not completely applicable to the fractional-order systems. In this study, stability regions based on specified gain and phase margins for a fractional-order PI controller to control integrating processes with time delay have been obtained and visualized in the plane. Fractional integral order is assumed to vary in a range between 0.1 and 1.7. Depending on the values of the order and phase and gain margins, different stability regions have been obtained. To obtain stability regions, two stability boundaries have been used; RRB (Real Root Boundary) and CRB (Complex Root Boundary). Obtained stability regions can be used to design all stabilizing fractional-order PI controllers. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    Integral-proportional derivative controller tuning rules obtained from optimum responses for set-point tracking of unstable processes with time delay
    (Sage Publications Ltd, 2023) Kaya, Ibrahim; Cokmez, Erdal
    This paper introduces the design of integral-proportional derivative (I-PD) controllers for unstable first-order plus time-delay and integrating-unstable first-order plus time-delay processes. Minimization of the error based on integral performance criteria is performed to derive analytical rules using curve fitting techniques. Obtained analytical formulas may be used to determine the necessary tuning parameters of the I-PD controller from the known plant transfer function parameters. Advantages of the introduced tuning of I-PD controllers are shown by comparisons with other existing ones in terms of unit step responses, measurement noise, control signals, perturbations in plant transfer function parameters, and integral performance indices. Results have shown that some significant advantages have been achieved with the introduced tuning of I-PD controllers when compared to others in the literature.
  • [ X ]
    Öğe
    Optimal design of I-PD controller for disturbance rejection of time delayed unstable and integrating-unstable processes
    (Taylor & Francis Ltd, 2024) Cokmez, Erdal; Kaya, Ibrahim
    Disturbance rejection has always been a major phenomenon in control theory. Disturbances that arise in control of unstable or integrating unstable processes with time delay present considerable difficulties for classical PID controllers. This paper supplies analytical tuning rules, derived from optimum disturbance rejection responses to minimise the error signal according to several integral performance criteria to identify the tuning parameters of the I-PD controller. The provided analytical rules offer the advantage of calculating controller parameters without the necessity of employing an optimisation algorithm. This simplifies the tuning process and allows for a straightforward determination of the controller's parameters, making it more convenient and efficient for practical implementation in control systems. Comprehensive simulations were performed to validate the effectiveness of the proposed I-PD controller in terms of disturbance rejection responses, control signals, perturbation in process parameters, measurement noises, TV values, Ms values, and integral performance indicators. Overall, the outcomes demonstrate that the introduced method for the tuning of I-PD controllers offers notable advantages when compared to other tuning methods found in the literature.
  • [ X ]
    Öğe
    PID Controller Design for Controlling Integrating Processes with Dead Time using Generalized Stability Boundary Locus
    (Elsevier, 2018) Atic, Serdal; Cokmez, Erdal; Peker, Fuat; Kaya, Ibrahim
    This paper proposes a method so that all PID controller tuning parameters, which are satisfying stability of any integrating time delay processes, can be calculated by forming the stability boundary loci. Processes having a higher order transfer function must first be modeled by an integrating plus first order plus dead time (IFOPDT) transfer function in order to apply the method. Later, IFOPDT process transfer function and the controller transfer function are converted to normalized forms to obtain the stability boundary locus in (KKcT,KKc(T-2 / T-i)), (KKcT,KKcTd) and (KKc(T-2 / T-i),KKcTd) planes for PID controller design. PID controller parameter values achieving stability of the control system can be determined by the obtained stability boundary loci. The advantage of the method given in this study compared with previous studies in this subject is to remove the need of re-plotting the stability boundary locus as the process transfer function changes. That is, the approach results in somehow generalized stability boundary loci for integrating plus time delay processes under a PID controller. Application of the method has been clarified with examples. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    Stability Boundary Locus For Unstable Processes with Time Delay Under Fractional-order PI Controllers
    (Ieee, 2018) Cokmez, Erdal; Kaya, Ibrahim
    Applications of the fractional calculus have recently found a wide area in control theory by means of the advantages fractional derivative order and fractional integrator order provide. As a result, the importance of designing a better fractional-order controller to satisfy the conditions has increased. Because of the difficulties in designing fractional-order controller in the time domain, generally, the frequency domain is used to design controller. Frequency domain parameters as phase margin, gain margin, phase crossover frequency and gain crossover frequency are generally used for designing of the controllers. This paper represents a solution to obtain stability regions to stabilize a first order unstable system plus dead time with fractional-order proportional integrating (PI) controller and aims to show the effects of fractional integrator order, phase margin, and time delay on stability areas by obtaining different stability regions for different fractional integrator order, phase margins and time delays. While the fractional integrator value is varied in a range of [0.1-1], specific values are chosen for phase margin and time delay to observe the alteration in the stability regions. By using stability regions all stabilizing fractional-order Proportional Integrating controllers can be designed.