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