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Öğe Comparison of Different Memristor Emulators on Low-Pass Filter Circuit(Institute of Electrical and Electronics Engineers Inc., 2019) Gursul S.; Hamamci S.E.The notion of the memristor was first introduced by Leon O. Chua in 1971. Taking into account the relationships between current, voltage, electric charge and flux magnitudes, Chua argued that there should be a fourth basic passive element in addition to resistance, capacitor and inductor. Although Chua mathematically modeled a memristor, he could not physically obtain it. Later, in 2008, the memristor was physically obtained as a result of long efforts in the Hewlett-Packard Laboratories. But nowadays it is not common to use it as an electronic element, especially because of its high cost. Instead, there are different emulator circuits in the literature that can serve as memristors. In this study, two different memristor emulators in the literature were considered. The effects of each memristor emulator on the electronic circuit were compared using these emulators in a low pass filter circuit instead of resistance. The efficiency of the used memristor emulators was investigated in the low pass filter circuit. © 2019 IEEE.Öğe A controller based on coefficient diagram method for the robotic manipulators(2000) Uçar A.; Hamamci S.E.In this paper a controller based on coefficient diagram method is introduced developed for robotic manipulators. The significant property of this controller is the designer can design the controller simultaneously taking a good balance of stability, response, and robustness. The closed loop performance is illustrated for a manipulator with a bounded disturbance. © 2000 IEEE.Öğe Fractional order PI? control strategy for a liquid level system(2010) Narayanaswamy P.N.; Kanthabhabha P.; Hamamci S.E.This paper deals with the design of fractional order proportional integral (PI?) controller for Liquid Level System (LLS). To achieve this, a fractional order model of LLS (FO-LLS) is obtained using J-index optimization method. Based on this model, a fractional order PI ? controller satisfying required gain margin (GM) and phase margin (PM) using Stability Boundary Locus method is designed. Simulation of LLS control system is carried out for the set point tracking. Performance of the PI? controller designed by FO-LLS model is compared to that of Chidambaram's integer order PI controller for integer order model. Finally, the robustness of both control systems is considered. © 2010 IEEE.Öğe A graphical stability analysis method for cascade conjugate order systems(American Society of Mechanical Engineers (ASME), 2021) Cetintas G.; Hamamci S.E.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. Copyright © 2021 by ASMEÖğe A practical PI tuning approach for time delay systems(IFAC Secretariat, 2012) Onat C.; Hamamci S.E.; Obuz S.In this paper, a simple PI tuning method for time delay systems is proposed. The main characterization of the method is first to obtain the stability region in the (kp, ki)-plane using the stability boundary locus method and then to find the weighted geometrical center point of this region through its stability boundaries. Finally, this center point of the stability region in the (kp, ki)-plane gives the tuning parameters for the PI controller. The proposed method gives a simple and reliable result which is illustrated by several examples, and hence is practically useful for the designers in the analysis and control of time delay systems. © 2012 IFAC.Öğe Robust temperature control of MSF desalination plants with coefficient diagram method(2003) Koksal M.; Hamamci S.E.Design of a controller sufficiently robust to the parametric uncertainties for the plant parameters is an important problem. Coefficient Diagram Method (CDM) is shown to be an efficient control technique to solve this problem. The controller design by CDM is based on the choice of the coefficients of the characteristic polynomial of the closed loop system according to the convenient performance criteria such as equivalent time constant, and stability indices. In this study, the controllers are designed for three temperature loops of large Multi-stage flash (MSF) desalination system by using CDM; then, obtained time domain characteristics are compared with the results of some other methods. It is shown that CDM design is more stable and robust whilst giving the desired time domain system performance.Öğe Simulation studies on stable PI controller parameters(2006) Bhaba P.K.; Somasundaram S.; Karunanithi T.; Hamamci S.E.The main objective of this paper is to compute the stable parameters of a PI controller for air flow temperature system (AFTS). The AFTS is approximated as-first order plus time delay (FOPTD) model.Öğe Smith predictor design by CDM(Institute of Electrical and Electronics Engineers Inc., 2001) Hamamci S.E.; Kaya I.; Atherton D.P.Good control of processes with a long dead time is often achieved using a Smith predictor structure. Typically a PI or PID controller is used in this configuration. In this paper, controller design is considered for a recently proposed modified form of the Smith predictor. The design is done using the Coefficient Diagram Method (CDM) to achieve a good step response to a set point change. The proposed method is compared with some other existing methods to illustrate its value. © 2001 EUCA.Öğe Transient response control by fractional-order PI controllers(2011) Hamamci S.E.; Obuz S.Consideration of the transient response is one of the key topics in control system design for time delay systems. In this paper, an efficient method to control the transient response of the first order plus time delay stable (FOPTD) systems using the fractional-order PI (PI?) controllers is presented. The main characterization of the method is first to construct the global stability region in the (kp, ki)-plane for any fixed value of ? and then to obtain ts and Mp curves corresponding to special settling time and maximum overshoot values in this region. Finally, by intersection of these curves, the D?- stability region in the (kp, ki)-plane is found. Changing the value of ? in the range of (0, 2), a set of D?- stability regions is obtained. These regions involve the controller parameters providing the closed loop settling time and maximum overshoot specifications together in the acceptable values. Therefore, the designer can easily decide to the selection of suitable values of kp, ki and ?. The simulation results indicate that the presented transient response control method is effective and practically useful in the analysis and control of the stable FOPTD systems by means of fractional-order PI controllers. © 2011 by ASME.
