Mekatronik Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/255

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Author: search.filters.author.Schmidt, K.W.Publication Index: search.filters.publicationIndex.Scopus

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Now showing 1 - 7 of 7
  • Conference Object
    Citation - Scopus: 2
    An Optimization Model To Coordinate Scheduling and Controling in Projects: Case With Instantaneous Control Constraints
    (National Technical University of Athens, 2014) Schmıdt, Klaus Werner; Hazir, Ö.; Schmidt, K.W.; Eryilmaz, U.; Mekatronik Mühendisliği
    Today, many enterprises in different industries take part in various projects, and organizational performances depend more and more on project performances. In order to maximize performance, effective management of project functions is crucial. In this regard, we focus on scheduling and control functions and their relation. Characteristics of data sharing among them and possible integration strategies are theoretically investigated. A model base for a decision support framework that accounts for these interdependencies and supports managers is developed. To solve the formulated integrated project scheduling and control problem, a tabu search algorithm is combined with optimal control techniques. As a result, a project schedule as well as the means and timing of interventions are determined such that the project cost is minimized. The obtained results are supported by computational experiments. Integrated models and algorithms to be developed aim to fill an important theoretical gap in project management.
  • Conference Object
    The Implementation of Dynamic Distributed Real Time Industrial Communication Protocol (D 2rip)
    (2012) Gözcü, A.K.; Turan, U.; Schmidt, E.G.; Schmidt, K.W.
    Ethernet is a popular technology for industrial networking thanks to its low cost and high bandwidth. The current proposals to achieve real-time communication over Ethernet do not consider the determinism of the control applications resulting in inefficient use of bandwidth resources. We proposed a protocol stack architecture that works with standard Ethernet to address this problem. This paper describes the implementation of this architecture over Real-time Linux operating system and the first experiments to verify the operation. The implementation and performance of IEEE 1588 protocol which provides the required synchronization is also presented. © 2012 IEEE.
  • Conference Object
    The Verification of a Novel Framework for Real-Time Shared Medium Communication Network Protocols
    (2012) Kartal, Y.B.; Schmidt, E.G.; Schmidt, K.W.
    The subject of this work is the real-time communication of the distributed industrial control applications over shared-medium Ethernet. We developed a framework for the real-time communication protocols over shared-medium Ethernet in our previous work. The framework is designed using the Timed Input/Output Automata formalism to serve the changing real-time communication needs of the embedded control applications. In this paper we present the modeling, simulation and formal verification process of the proposed framework using UPPAAL toolbox. © 2012 IEEE.
  • Conference Object
    Supervisory Control for Failure Recovery in Discrete Event Systems
    (2012) Schmidt, K.W.
    Discrete event system models are used for systems with a discrete state space and event-driven state transitions such as communication systems and manufacturing systems. This paper proposes a polynomial-time algorithm for the construction of fault-tolerant supervisors for discrete event systems. Such supervisor ensures the desired system behavior as long as no faults occur, and realizes a redundant behavior in case of faults. © 2012 IEEE.
  • Conference Object
    Citation - Scopus: 2
    Computation of Supervisors for Fault-Recovery and Repair for Discrete Event Systems
    (Univelt Inc., 2014) Sülek, A.N.; Schmidt, K.W.
    In this paper, we study the fault-recovery and repair of discrete event systems (DES). To this end, we first develop a new method for the fault-recovery of DES. In particular, we compute a fault-recovery supervisor that follows the specified nominal system behavior until a fault-occurrence, that continues its operation according to a degraded specification after a fault and that finally converges to a desired behavior after fault. We next show that our method is also applicable to system repair and we propose an iterative procedure that determines a supervisor for an arbitrary number of fault occurrences and system repairs. We demonstrate our method with a manufacturing system example. © IFAC.
  • Conference Object
    Citation - Scopus: 8
    Computation of Fault-Tolerant Supervisors for Discrete Event Systems
    (IFAC Secretariat, 2013) Sülek, A.N.; Schmidt, K.W.
    Fault-tolerance addresses the problem of operating a system even in case of faults. In this paper, we study fault-tolerance in the supervisory control framework for discrete event systems (DES). We consider DES, where certain events might no longer be possible in case a fault happens. In this setting, we first identify necessary and suficient conditions for the existence of a supervisor that realizes a given behavioral specification both in the non-faulty and in the faulty case. We further show that it is possible to determine a supremal fault-tolerant sublanguage in case the existence condition is violated. Finally, we propose an algorithm for the computation of this sublanguage and prove its correctness. Different from existing work, our fault-tolerant supervisor allows fault occurrences and system repairs at any time. The concepts and results developed in this paper are illustrated by a manufacturing system example. © 2013 IFAC.
  • Conference Object
    Citation - Scopus: 5
    Abstraction-Based Supervisory Control for Recon-Gurable Manufacturing Systems
    (IFAC Secretariat, 2013) Khalid, H.M.; Kirik, M.S.; Schmidt, K.W.
    Reconfiguration control for discrete event systems (DES) is concerned with the realization of different system configurations by modification of the supervisory control loop. In this paper, we study the reconfiguration supervisor design for reconfigurable manufacturing systems (RMS) that comprise multiple components. We construct a modular supervisor for each configuration and system component in order to realize each active configuration and to quickly change between configurations. Different from the existing literature that is focused on monolithic design, our method is abstraction-based, and, hence applicable to large-scale DES. © 2013 IFAC.