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Biblioteca Digital do IPB (53.442 recursos)

A Biblioteca Digital do IPB, tem por objectivo divulgar e permitir o livre acesso à produção científica produzida pela comunidade académica, promovendo a integração, partilha e a visibilidade da informação científica e garantindo a preservação da memória intelectual do Instituto Politécnico de Bragança.

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Mostrando recursos 1 - 20 de 25

  1. Adaptive multi-agent system for a washing machine production line

    Rodrigues, Nelson; Pereira, Arnaldo; Leitão, Paulo
    This paper describes the implementation of a multi-agent system in a real industrial washing machine production line aiming to integrate process and quality control, allowing the establishment of feedback control loops to support adaptation facing condition changes. For this purpose, the agent-based solution was implemented using the JADE framework, being the shared knowledge structured using a proper ontology, edited and validated in Protégé and posteriorly integrated in the multi-agent system. The solution was intensively tested using historical real production data and it is now being installed in the real production line. The preliminary results confirm the initial expectations in terms...

  2. Integration of process and quality control using multi-agent technology

    Cristali, Cristina; Foehr, Matthias; Leitão, Paulo; Paone, Nicola; Castellini, Paolo; Turrin, Claudio; Schjolberg, Ingrid
    The paper introduces a new approach on design of distributed manufacturing control systems. It will be shown how multi-agent principles, self-learning, self-adaptation and a new engineering method for distributed production systems can be used to enhance integration of production control process quality control. It will be highlighted how multi-agent systems may be implemented to enforce interaction of manufacturing execution system and distributed control system, enhancing the exploitation of all available information at the quality control and process control levels. Additional focus is set on production process modeling, quality control algorithms and an engineering methodology integrating all these aspects within. The final results...

  3. Quality control agents for adaptive visual inspection in production lines

    Stroppa, Lorenzo; Rodrigues, Nelson; Leitão, Paulo; Paone, Nicola
    In the last decade multi-agent systems (MAS) have been thoroughly investigated as a suitable paradigm for process control. Despite the difficulties in designing and maintaining a MAS architecture for real production scenarios, several EU research projects have been financed and many companies are looking at the improvement in the production efficiency of such systems. The EU FP7 GRACE project aims at the integration of process and quality control in a multi-agent environment. This paper discusses the integration of quality control stations into the GRACE MAS. The stations themselves will become autonomous agents, capable of self-reconfiguration according to the needs of the...

  4. Data collection for global monitoring and trend analysis in the GRACE multi-agent system

    Pereira, Arnaldo; Rodrigues, Nelson; Leitão, Paulo
    Multi-agent systems (MAS) paradigm is a suitable approach to implement distributed manufacturing systems addressing the emergent requirements of flexibility, robustness and responsiveness. In such systems, the distributed agents have a local view of the system environment being the global data collection a complex and critical issue to provide the functionalities of the ISA-95 standard, such as dynamic scheduling, maintenance management and quality assurance. This paper describes the data collection mechanisms in a multiagent system that supports the global monitoring over the time and the trend analysis to perform self-adaptation and selfoptimization. The proposed approach was developed and tested in an industrial washing machines production...

  5. Integrating mechatronic thinking and multi-agent approaches

    Foehr, Matthias; Leitão, Paulo; Wagner, Thomas; Jäger, Tobias; Lüder, Arndt
    The paper introduces a concept for the combination of mechatronic unit and multi-agent system approaches. It highlights how combining both approaches to a new kind of integrated system architecture may enforce the dissemination and reusability of methods and automatisms developed for one specific system architecture to other similar ones. Additionally it will show how this integrated architecture leads to a better exchange of Automation architectures in general. Thus, all systems compliant with the described architecture may benefit from methods and automatism applicable for a broad range of systems. The suitability of this integration approach is verified by using the example of...

  6. Adaptation of functional inspection test plan in a production line using a multi-agent system

    Rodrigues, Nelson; Leitão, Paulo; Foehr, Matthias; Turrin, Claudio; Pagani, Arnaldo; Decesari, Roberto
    The multi-agent systems technology is a proper approach to implement distributed manufacturing systems exhibiting adaptation and flexibility. This paper proposes a multi-agent based solution for the adaptation of the functional test plan in a production line producing washing machines, aiming to increase the process productivity and product quality. The global adaptation mechanism is embedded on the multiagent system infrastructure, allowing the optimized selection of tests based on the correlation of the quality data gathered along the production line. The proposed approach was developed and installed on a real production line producing washing machines under the European Seventh Framework Programme GRACE project.

  7. Adaptive image pre-processing for quality control in production lines

    Arroyo Esquivel, Esteban; Lima, José; Leitão, Paulo
    Flexible and self-adaptive behaviours in automated quality control systems are features that may significantly enhance the robustness, efficiency and flexibility of the industrial production processes. However, most current approaches on automated quality control are based on rigid inspection methods and are not capable of accommodating to disturbances affecting the image acquisition quality, fact that hast direct consequences on the system´s reliability and performance. In an effort to address the problem, this paper presents the development of a self-adaptive software system designed for the pre-processing (quality enhancement) of digital images captured in industrial production lines. The approach introduces the use of scene recognition as a key-feature to allow the execution of customized image pre-processing...

  8. Deployment of multi-agent systems for industrial applications

    Pereira, Arnaldo; Rodrigues, Nelson; Leitão, Paulo
    Multi-agent system (MAS) is being pointed out as a suitable technology to develop systems that demand flexibility, robustness and re-configurability. Consequently, a significant effort has been noticed to apply MAS to industrial domains exhibiting these characteristics, like manufacturing and smart grids. In spite of the adequacy of the MAS principles to solve the industrial requirements, the truly deployment of MAS for industrial applications is far to be solved. This paper discusses the current challenges for the deployment of MAS in the context of industrial applications, mainly focusing the integration of agents with physical equipment and the ability to run agents...

  9. GRACE ontology integrating process and quality control

    Leitão, Paulo; Rodrigues, Nelson; Turrin, Claudio; Pagani, Arnaldo; Petrali, Pierluigi
    Multi-agent systems paradigm is a suitable approach to implement distributed manufacturing systems addressing the emergent requirements of flexibility, robustness and responsiveness. In such systems, an ontology is a crucial piece to provide a common understanding on the vocabulary used by the intelligent, distributed agents during the exchange of shared knowledge. This paper describes the design of an ontology to define the structure of the knowledge that is used within a multi-agent system integrating process and quality control in production lines for home appliances, which is being developed within the EU FP7 GRACE (inteGration of pRocess and quAlity Control using multi-agEnt...

  10. NMRP of styrene-divinylbenzene: predictions in the pre- and post-gelation periods using different modelling approaches

    Aguiar, Leandro; Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Costa, Mário Rui; Giudici, Reinaldo
    Three modeling approaches for the NMRP of slyrene-divinylbenzene were used for describing experiments performed at different initial conditions: a rigorous approach (model A) based on balance of species and method of characteristics in terms of generating functions and two simplified approaches based upon mass and moment balances, numerical fractionation and pseudo-kinetic method (models B and C). Balances of paths connecting groups were used for tackling loop formation reactions. A critical comparison of the effect of underlying assumptions of lhe three approaches was carried out. Simulations making use of the concept of path balances presented good results for the predictions of pendant double bonds (PDB) concentration. Numerical...

  11. Towards the integration of process and quality control using multi-agent technology

    Castellini, Paolo; Cristalli, Cristina; Foehr, Matthias; Leitão, Paulo; Paone, Nicola; Schjolberg, Ingrid; Tjønnås, Johannes; Turrin, Claudio; Wagner, Thomas
    The paper introduces a vision on the design of distributed manufacturing control systems using the multi-agent principles to enhance the integration of the production and quality control processes. It is highlighted how agent technology may enforce interaction of manufacturing execution system and distributed control system, enhancing the exploitation of the available information at the quality control and process control levels. A specific focus is made on a suitable engineering methodology for the design and realization of such concept. Innovation is also presented at the level of adaptive process control and self-optimizing quality control, with examples related to a home appliance...

  12. Modelling and validating the multi-agent system behaviour for a washing machine production line

    Leitão, Paulo; Rodrigues, Nelson
    This paper describes the formal modelling and validation of the behaviour of a multi-agent system that integrates the production and quality control processes in a washing machine production line. The modelling, analysis and validation process uses the Petri nets formalism that provides a rigorous and formal language based on its powerful mathematical foundation, supporting the complete verification of the system correctness during the design phase and before to proceed to the deployment phase. The behaviour models of each agent belonging to the system architecture are edited, analysed and simulated in the PnDK framework.

  13. Multi-agent system for on-demand production integrating production and quality control

    Leitão, Paulo; Rodrigues, Nelson
    Multi-agent systems is being pointed as particularly suited to design and engineer a new class of control systems to operate at the factory plants addressing the current requirements of modularity, flexibility and re-configurability. This paper introduces the main principles of a multi-agent system approach to support the integration of production and quality control processes in washing machines production lines that is being developed under the EU FP7 GRACE project.

  14. Functionalization of metal-organic frameworks for hexane isomers separation

    Mendes, Patricia; Rodrigues, A.E.; Ragon, Florence; Horcajada, Patricia; Serre, Christian; Silva, José A.C.
    This work shows the effect of incorporating three different organic ligands (NH2-H2BDC, NO2-H2BDC and Br-H2BDC) into UIO-66(Zr) framework viewing the separation of hexane isomers(22DMB, 23DMB, 3MP and nHEX).

  15. Simulation of multi-agent manufacturing systems using agent-based modelling platforms

    Barbosa, José; Leitão, Paulo
    Multi-agent systems (MAS) are driving the way to design and engineer control solutions that exhibit flexibility, adaptation and reconfigurability, which are important advantages over traditional centralized systems. The understanding, design and testing of such distributed agentbased approaches, and particularly those exhibiting self-* properties, are usually a hard task. Simulation assumes a crucial role to analyse the behaviour of MAS solutions during the design phase and before its deployment into the real operation. Particularly, Agent-Based Modelling (ABM) tools are well suited to simulate MAS systems that exhibit complex phenomena, like emergent behaviour and self-organization. This paper discusses the simulation of agent-based...

  16. Mycobiota and aflatoxigenic profile of Portuguese almonds and chestnuts from production to commercialisation

    Rodrigues, Paula
    Aflatoxin (AF) contamination of nuts is an increasing concern to the consumer’s health. Portugal is a big producer of almonds and chestnuts, but there is no scientific knowledge on the safety of those nuts. AFs B1, B2, G1 and G2 are produced mainly by some species of Aspergillus belonging to section Flavi, which is composed of a large number of very closely related species. While these species are difficult to differentiate morphologically and even genetically, they differ in a characteristic that is of paramount importance for food safety, as only some are responsible for the production of the highly toxigenic...

  17. Modelling and simulating self-organizing agent-based manufacturing systems

    Barbosa, José; Leitão, Paulo
    The multi-agent systems paradigm, enhanced with biological inspired concepts, such as swarm intelligence and selforganization, offers an alternative way to design control solutions that address the current demands or flexible, robust, responsive and adaptive manufacturing and automation systems. Being the development of these systems traditionally complex, the use of modelling and simulating environments may contribute for the fast prototyping and proof of concept of these solutions. This paper explores the use of these environments and uses the NetLogo platform to illustrate the development of an agent-based control application for an experimental production system. The designed and tested agent-based system exhibits robustness and...

  18. Suspension copolymerization of styrene/divinylbenzene with gel formation: kinetic modelling using in-line FTIR-ATR monitoring and SEC-MALLS product characterization

    Gonçalves, Miguel; Pinto, Virgínia; Dias, Rolando; Costa, Mário Rui
    Experimental and theoretical studies concerning the suspension copolymerization of styrene with divinylbenzene are reported. Experiments are carried out in a batch stirred reactor, at 1.2 dm3 scale, and extended beyond gelation in order to synthesize macroporous copolymer networks with applications for many separation processes

  19. Customizable service-oriented Petri net controllers

    Mendes, João M.; Restivo, Francisco; Leitão, Paulo; Colombo, Armando W.
    In industrial automation, service-orientation is a relatively new and ascending concept and thus, concrete integrated methodologies are missing to accomplish the required development tasks. A suitable approach is to use the powerful set of features that Petri nets formalism provides for such dynamic systems. This paper presents a token game template that is part of the open methodology for the development of customized Petri nets controllers, targeting the engineering of service-oriented industrial automation. This template is based on a state machine specification for the life-cycle of transitions that leaves several options open for extending it with features depending on the...

  20. Process optimization of service-oriented automation devices based on Petri nets

    Mendes, João M.; Leitão, Paulo; Restivo, Francisco; Colombo, Armando W.
    Best paper award.

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