Yazar "Cetintas, Gulten" seçeneğine göre listele

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    A GRAPHICAL STABILITY ANALYSIS METHOD FOR CASCADE CONJUGATE ORDER SYSTEMS
    (Amer Soc Mechanical Engineers, 2021) Cetintas, Gulten; Hamamci, Serdar Ethem
    The theory and applications of complex fractional analysis have recently become a hot topic in the fields of mathematics and engineering. Therefore, studies on the complex order systems and their subset called the complex conjugate order systems began to appear in the control community. On the other hand, the concept of stability has always been an important issue, especially in the analysis and control of dynamical systems. In this paper, a graphical method for stability analysis of the complex conjugate order systems is presented. Since the proposed method is based on the Mikhailov stability criterion known from the stability theory of integer order systems, it is named the generalized modified Mikhailov stability criterion. This method gives stability information about the higher order complex conjugate order systems, i.e. cascade conjugate order systems, according to whether it encloses the origin in the complex plane or not. Three simulation examples for the cascade conjugate order systems are given to show the effectiveness and reliability of the method presented. The results are verified by the poles on the first sheet of Riemann surface and also time responses of the systems, which are calculated analytically in a very complex way.
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    Proportional-integral-derivative stabilization of complex conjugate-order systems
    (Sage Publications Ltd, 2022) Cetintas, Gulten; Hamamci, Serdar Ethem
    Proportional-integral-derivative (PID) stabilization is an important control design strategy that provides the designer with all PID controller set which results control system stability absolutely. In this way, the designer has a wide range of freedom to obtain the controller that meets the desired criteria. This process is particularly advantageous in situations where it is difficult to clearly define the design criteria at the beginning of the design or to make a balanced decision among the design criteria. The main objective of this paper is to present for the first time a PID stabilization method for complex conjugate-order systems, which is a new type of system for the control community and has been little studied on. The method is based on obtaining of stability/instability regions using the D-decomposition method in the controller parameter space graphically. These regions are formed by stability boundaries that are defined as real root, infinite root and complex root boundaries. The stability of the regions is determined using generalized modified Mikhailov stability criterion that is a powerful stability tool of the system theory. The simulation results indicate that the presented stabilization method is effective and practically useful in the analysis and control of the complex conjugate-order systems.
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    A Simple Graphical-Based Proportional-Integral-Derivative Tuning Method for Time-Delay Systems
    (Aves, 2023) Cetintas, Gulten; Ozyetkin, Munevver Mine; Hamamci, Serdar Ethem
    In this paper, a graphical-based proportional-integral-derivative (PID) tuning technique for time-delay systems is presented. The suggested tuning technique combines the stability boundary locus (SBL) method with the weighted geometrical center (WGC) concept. The plot of the stability region obtained by using real root boundary (RRB), infinite root boundary (IRB), and complex root boundary (CRB) in the parameter plane forms the basis of the proposed method. The tuning steps of the method can be expressed as follows. First, the stability region in (k(d), k(p)) -plane is obtained using the SBL for the fixed RRB line. Thus, the stability value range of the k(d) parameter is determined. Second, using these k(d) values, the entire set of stability regions in (k(p), k(i)) -plane is obtained. These regions constitute a three-dimensional global stability region in (k(p), k(i),k(d)) space. Finally, the WGC points of stability regions in each (k(p),k(i)) -plane are calculated. The center point having the best time domain performance among these WGC points is determined. This point gives the PID tuning parameters for the proposed method. The simulation results indicate that the presented tuning technique gives simple and reliable results and is useful in the stability analysis and the control of time-delay systems.
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    A Smart Campus Integrated With Smart Grid
    (Ieee, 2017) Ozupak, Yildirim; Cetintas, Gulten; Kaygusuz, Asim
    Recently, smart campus projects that will improve quality of the services they received and the daily activities of students and employees in the campus environment, have been put into practise. The smart campus includes issues such as increasing energy efficiency, facilitating transportation, parking area control, provision of access to multiple services with card systems, information systems, monitoring and control of systems, authorization of users, use of social areas, water saving and security. The smart campus also means that all these components are managed centrally. In this study, it is aimed to make intelligent campus compatible with smart grid and supported by renewable energy. For that reason, improvements and solution proposal that can be made on the current situation have been presented.