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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.

DE - Publicações em Actas de Encontros Científicos com Arbitragem Científica

Mostrando recursos 1 - 20 de 199

  1. Multi-agent systems as automation platform for intelligent energy systems

    Leitão, Paulo; Vrba, Pavel; Strasser, Thomas
    The large-scale integration of distributed energy resources into a complex cyber-physical system demands proper automation platforms for monitoring, control, optimization and reconfiguration, addressing intelligent energy systems. This paper discusses the use of multi-agent systems as a suitable solution to address this challenge by analyzing their benefits when applying them to the field of Smart Grids and surveying existing works and initiatives. The principles and use cases established in the MASGrid project illustrate the application of multi-agent technology in active power distribution systems.

  2. Standards compliance in industrial agents applications

    Seixas, Inês; Leitão, Paulo
    Multi-agent systems are a suitable approach to address the current requirements imposed to companies demanding for more flexible, adaptive and reconfigurable systems. In spite of the promising perspective, only a reduced number of such solutions are running in industrial scenarios. Standardization is recognized as a major issue in the development of devices, systems or processes in industrial environments, constituting a real road-blocker for the wider acceptance of agent-based solutions in industry. This paper discusses the importance of standardization compliance in the development of industrial agent-based solutions and the actions to be performed to overcome this issue.

  3. 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...

  4. 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...

  5. 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...

  6. 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...

  7. Methodology for consideration of system quality within manufacturing

    Foehr, Matthias; Jäger, Tobias; Turrin, Claudio; Petrali, Pierluigi; Pagani, Arnaldo; Leitão, Paulo
    The present paper deals with the question how system quality can be influenced within its engineering and manufacturing. It focuses on discrete manufacturing by system of systems and presents a methodology to gather and analyze relevant influences on system quality within a MPFQ-model. The model is based on four main elements: Materials, Processes, Functions and Quality. The paper brings together functional design/thinking in system of systems engineering with system engineering and manufacturing design. It will show the basic architecture behind the MPFQ model and how quality influences can be methodically detected. Afterwards the application of the MPFQ-model will be shown and...

  8. 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.

  9. Trust and risk management towards resilient large-scale cyber-physical systems

    Pereira, Arnaldo; Rodrigues, Nelson; Barbosa, José; Leitão, Paulo
    Empowering distributed entities with decisional and adaptation capabilities is the current trend in control systems operating in highly changing environments. Cyber-Physical Systems (CPS) is a paradigm addressing this challenge as it allows the integration of both physical and decisional parts. By acting in highly changing environments, these complex control systems must be resilient. This paper proposes a trust and risk management mechanism to be deployed in CPS for resilience improvement. This mechanism, inspired by social and biological behaviour, is deployed in a smart-grid demonstrator. The preliminary results show that embedding this mechanism into distributed entities can lead to an increase...

  10. 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...

  11. Analysis and development of a localization system based on radio frequency

    Ferreira, D.M.; Ribeiro, António Fernando; Rocha, J.G.; Carmo, João
    This paper presents an analysis on several strategies for location based on Radio-Frequency. The purpose of this study is to develop an infrastructure able to determine the position of a target within an area of 0.1 acres (aprox.11000 ft2 or 1000 m2) with an acceptable precision for the specific task. Along with the analysis of the many strategies and approaches on Radio- Location, this study tries to determine the best solution to implement a working system of location in an easy, secure and less expensive way, a solution able to be used in football field, without the use of large and/or expensive infrastructures like the Global Position System (G.P.S.) network.

  12. A comparison of voltage stability indices

    Reis, Claudia; Barbosa, F.P. Maciel
    Voltage stability has become a very importante issue of power systems analysis. This paper discusses some important aspects related to voltage stability indices in electric power systems. Some techniques previously studied in the literature are analyzed and a comparison of the performance of several indices is presented. The effectiveness of the analyzed methods are demonstrated through numerical studies in IEEE 14 busbar test system, using several different scenarios of load increase

  13. 2.4 GHz wireless sensor network for smart electronic shirts

    Carmo, João; Mendes, P.M.; Couto, Carlos; Correia, J.H.
    This paper presents a wireless sensor network for smart electronic shirts. This allows the monitoring of individual biomedical data, such the cardio-respiratory function. The solution chosen to transmit the body’s measured signals for further processing was the use of a wireless link, working at the 2.4 GHz ISM band. A radio-frequency transceiver chip was designed in a UMC RF 0.18 μm CMOS process. The power supply of the transceiver is 1.8 V. Simulations show a power consumption of 12.9 mW. Innovative topics concerning efficient power management was taken into account during the design of the transceiver.

  14. 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...

  15. Service-oriented SCADA and MES supporting petri nets based orchestrated automation systems

    Colombo, Armando W.; Mendes, João M.; Leitão, Paulo; Karnouskos, Stamatis
    The fusion of mechatronics, communication, control and information technologies has allowed the introduction of new automation paradigms into the production environment. The virtualization of the production environment facilitated by the application of the service-oriented architecture paradigm is one of major outcomes of that fusion. On one side, service-oriented automation works based on exposition, subscription and use of automation functions represented by e.g. web services. On the other side, the evolution of traditional industrial systems, particularly in the production area, as a response to architectural and behavioural (functional) viewpoints of the ISA95 enterprise architecture, where a close inter-relation between SCADA, DCS...

  16. 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...

  17. 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.

  18. Enhancing ADACOR with biology insights towards reconfigurable manufacturing systems

    Barbosa, José; Leitão, Paulo; Adam, Emmanuel; Trentesaux, Damien
    Traditional centralized manufacturing structures were found inadequate to face the challenging requirements of flexibility and re-configurability. Lately, several manufacturing paradigms were introduced to face this challenge, being unified in the objective of providing decentralized control over distributed entities. In spite of their potential benefits, some important questions are far from been answered, namely how control structures are dynamically formed and evolved and how to combine adaptation and optimization. This paper introduces the main principles for re-configurable manufacturing systems that answers to these questions, based on the ADACOR holonic architecture and incorporating mechanisms inspired in other areas of science, notably biology,...

  19. Nervousness in dynamic self-organized holonic multi-agent systems

    Barbosa, José; Leitão, Paulo; Adam, Emmanuel; Trentesaux, Damien
    New production control paradigms, such as holonic and multi-agent systems, allow the development of more flexible and adaptive factories. In these distributed approaches, autonomous entities possess a partial view of the environment, being the decisions taken from the cooperation among them. The introduction of self-organization mechanisms to enhance the system adaptation may cause the system instability when trying to constantly adapt their behaviours, which can drive the system to fall into a chaotic behaviour. This paper proposes a nervousness control mechanism based on the classical Proportional, Integral and Derivative feedback loop controllers to support the system self-organization. The validation of...

  20. Self-organized holonic manufacturing systems combining adaptation and performance optimization

    Barbosa, José; Leitão, Paulo; Adam, Emmanuel; Trentesaux, Damien
    Traditional manufacturing solutions, based on centralized structures, are ineffective in unpredictable and volatile scenarios. Recent manufacturing paradigms, such as Holonic Manufacturing Systems, handle better these unpredictable situations but aren’t able to achieve the performance optimization levels displayed by the classical centralized solutions when the system runs without perturbations. This paper introduces a holonic manufacturing architecture that considers biological insights, namely emergence and self-organization, to achieve adaptation and responsiveness without degrading the performance optimization. For this purpose, self-organization and self-learning mechanisms embedded at micro and macro levels play an important role, as well the design of stabilizers to control the system...

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