Yazar "Gelen, Goekhan" seçeneğine göre listele

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    Asynchronous implementation of discrete event controllers based on safe automation Petri nets
    (SPRINGER LONDON LTD, 2009) Uzam, Murat; Koc, I. Burak; Gelen, Goekhan; Aksebzeci, B. Hakan
    In this paper, a new method is proposed for digital hardware implementation of Petri net-based specifications. The purpose of this paper is to introduce a new discrete event control system paradigm, where the control system is modeled with extended Petri nets and implemented as an asynchronous controller using circuit elements. The applicability of the proposed method is demonstrated by an asynchronous implementation of a Petri net-based discrete event control system (DECS) for an experimental manufacturing system using a Xilinx field programmable gate array (FPGA). Unlike microprocessor, microcontroller or programmable logic controller (PLC)-based software implementations or hardware-based synchronous implementations, the implementation method used in this paper is asynchronous and based on hardware offering very high speed to control fast plants at low cost. This paper is expected to serve as a guideline to show how to obtain very high speed, concurrent and asynchronous Petri net-based controllers.
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    The real-time supervisory control of an experimental manufacturing system based on a hybrid method
    (PERGAMON-ELSEVIER SCIENCE LTD, 2009) Uzam, Murat; Gelen, Goekhan
    In this paper, the real-time supervisory control of an experimental manufacturing system is reported based on a recently proposed hybrid (mixed PN/automaton) approach. Assuming that an uncontrolled bounded Petri net (PN) model of a (plant) discrete event system (DES) and a set of forbidden state specifications are given, the proposed approach computes a maximally permissive and nonblocking closed-loop hybrid model. The method is straightforward logically, graphically and technologically. This paper particularly shows the applicability of a hybrid (mixed PN/automaton) approach to low-level real-time DES control. To do this, programmable logic controller (PLC) based real-time control of an experimental manufacturing system is considered. (C) 2009 Elsevier Ltd. All rights reserved.