Now showing 1 - 10 of 13
  • Publication
    Robotisiertes Laser-Fernschweißen
    ( 2016)
    Monostori, László
    Das Ziel des Projekts ist die Verbesserung der Bearbeitungsgeschwindigkeit, die Erhöhung der Prozessflexibilität und der Energieeffizienz. Zudem sollen die realen und virtuellen Prozesse verknüpft werden, um eine Remote-Offline-Programmierung zu ermöglichen.
  • Publication
    Cyber-physical systems in manufacturing
    ( 2016)
    Monostori, László
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    Kádár, Botond
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    Kondoh, Shinsuke
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    Kumara, Soundar R.
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    Reinhart, Gunther
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    Schuh, Günther
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    Sihn, Wilfried
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    Ueda, Kanji
    One of the most significant advances in the development of computer science, information and communication technologies is represented by the cyber-physical systems (CPS). They are systems of collaborating computational entities which are in intensive connection with the surrounding physical world and its on-going processes, providing and using, at the same time, data-accessing and data-processing services available on the Internet. Cyber-physical production systems (CPPS), relying on the latest, and the foreseeable further developments of computer science, information and communication technologies on one hand, and of manufacturing science and technology, on the other, may lead to the 4th industrial revolution, frequently noted as Industrie 4.0. The paper underlines that there are significant roots in general - and in particular to the CIRP community - which point towards CPPS. Expectations towards research in and implementation of CPS and CPPS are outlined and some case studies are introduced. Related new R&D challenges are highlighted.
  • Publication
    Methodology and data-structure for a uniform system's specification in simulation projects
    ( 2013)
    Kardos, Csaba
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    Popovics, Gergely
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    Kádár, Botond
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    Monostori, László
    In the last few decades the evaluation and analysis of manufacturing systems' behavior and their performance became very important. Digital enterprise technologies, as for example discrete-event simulation (DES), are effective tools both in production related decision making processes and in structure and performance analysis of manufacturing systems. However, building a discrete-event based simulation model of a manufacturing system is a difficult task and requires special competence. The majority of simulation studies are aimed at analyzing a certain problem by a specific simulation model created by experts with a relatively high financial expenditure. The paper introduces an ongoing research aimed at developing a framework to reduce the efforts spent on draft simulation studies by simplifying and accelerating the process of model building. The proposed modeling methodology uses a uniform data structure which is a production oriented implementation of the ANSI/ISA-95 standard and supports the creation of models without simulation software specific knowledge. The supporting data structure enables the development and application of proprietary simulation engines tailored for specific problems. The paper compares the traditional and the proposed methodologies and also introduces the first experiments gained on specific test -cases. In our approach the simulation models are created automatically and independently from simulation tools which will be presented through the examples of both commercial and self-developed applications.
  • Publication
    Planning of remote laser welding processes
    ( 2013)
    Erdös, Gábor
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    Kemény, Zsolt
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    Kovács, András
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    Váncza, József
    The paper discusses the technical background of the remote laser welding (RLW) technology, its novel opportunities and implications for planning processes. Our ultimate goal is to develop a complete off-line programming toolbox for RLW which can provide an automated method for computing close-to-optimal robot programs. We suggest a workflow for the complete planning process, and propose new models and algorithms for solving the sequencing of welding tasks in conjunction with path planning, as well as for generating the inverse kinematics of the robot. The paper summarizes results of first computational experiments in an automotive case study using an industrial robot. The proposed method leads to a substantial reduction in the cycle time of the welding operation compared to an earlier approach.
  • Publication
    Designing cooperation mechanisms for supply chains
    ( 2012)
    Váncza, József
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    Egri, Péter
    The paper defines generic requirements towards cooperative planning in the nucleus of any supply network that is constituted by a pair of autonomous manufacturer and supplier who possess asymmetric information on demand forecast and costs, respectively. Then a novel way is suggested for investigating this problem by means of the apparatus of mechanism design. The analysis results in some provable generic properties as for efficiency and truthfulness, and shows the impossibility of fair cost and profit sharing. Further on, design principles towards a payment scheme are devised that provide incentive for the partners to cooperate in order to minimize costs. This payment can be considered the price for a flexible supply service. As examples, the generic framework is instantiated with two particular cooperative supply mechanisms.
  • Publication
    Applying model-reconstruction by exploring MES and PLC data for simulation support of production systems
    ( 2012)
    Pfeiffer, András
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    Kádár, Botond
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    Popovics, Gergely
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    Kardos, Csaba
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    Vén, Zoltán
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    Kemény, Lorinc
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    Monostori, László
    The paper introduces a discrete-event simulation-based decision supporting system aiming at automatically mirroring the current state of a large-scale material handling system of a production system in a digital model and supporting the analysis of diverse control settings and rules. The discrete-event digital model is built in an automated way and all the data necessary for the model are taken from a manufacturing execution system (MES) and additionally directly from programmable logic controllers (PLC). Main focus is given to present the results of the PLC program code processing method (code mapping) generating a structured dataset, as well as the model-reconstruction method for the simulation software. The easy-of-use support tool is intended to be used both in planning and operation phases of an automotive manufacturing company, thus the capabilities of model reconstruction and simulation are tested on real-world data.
  • Publication
    Uniform Data Structure for Production Simulation
    ( 2012)
    Popovics, Gergely
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    Kardos, Csaba
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    Kemény, Lorinc
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    Gyulai, Dávid
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    Monostori, László
    One of the most widespread techniques to evaluate various aspects of a manufacturing system is discrete-event simulation (DES). However, building a simulation model of a manufacturing system is a difficult task and requires special competence. The majority of simulation studies aimed at analyzing a certain problem by a specific simulation model created by experts. This approach requires relatively high financial expenditures. The paper introduces an ongoing research aimed at developing an application to reduce the costs of a draft simulation study. The input of the simulation models in the proposed methodology is based on ISA-95 standardized data structure. The instantiated input data set can be stored both in MS Excel, XML files or an SQL database. Having the complete input a simulation model can be created automatically without simulation expertise.
  • Publication
    Design and assessment of quality control loops for stable business processes
    ( 2012)
    Schmitt, Robert
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    Monostori, László
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    Glöckner, Henrik
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    Viharos, Zsolt János
    Due to their open and dynamic character, business processes in lack of adequate feedback mechanisms tend to become unstable in case of unanticipated disturbances or target adjustments. In order to face this challenge and to ensure entrepreneurial quality the implementation of quality control loops is proposed, whose design is derived from cybernetics. The paper discusses requirements for the characteristics of quality control loops and presents a new approach for their assessment implemented in software. The developed tool also serves as a knowledge exchange platform since it provides an opportunity for exchanging standardized control loop elements.
  • Publication
    A system for the detailed scheduling of wind farm maintenance
    ( 2011)
    Kovács, András
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    Erdös, Gábor
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    Viharos, Zsolt János
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    Monostori, László
    As the share of wind energy increases on the global energy market, the efficient operation of wind farms gains an ever growing significance. Among operational decisions, the planning and scheduling of maintenance operations are crucial for the availability of turbines, as well as for the operational costs. The paper introduces a system that performs the detailed scheduling of maintenance operations at a set of wind farms maintained by common personnel. The scheduling problem is modeled and solved as a mixed-integer linear program. The system constitutes a module of an integrated framework for condition monitoring, diagnosis, and maintenance of wind turbines.
  • Publication
    Cooperative and responsive manufacturing enterprises
    ( 2011)
    Váncza, József
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    Monostori, László
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    Lutters, D.
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    Kumara, S.R.
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    Tseng, M.
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    Valckenaers, P.
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    Brussel, H. van
    The paper discusses manufacturing enterprises' compelling challenges that are directly stemming from generic conflicts between competition and cooperation, local autonomy and global behavior, design and emergence, planning and reactivity, uncertainty and a plethora of information. Responses in product and service design, organization of production networks, planning and management of operations, as well as production control are surveyed. As illustrated through industrial case studies, production engineering should integrate a rich body of interdisciplinary results together with contemporary information and communication technologies in order to facilitate cooperation and responsiveness that are vital in competitive, sustainable manufacturing.