Papers by Alexandre Philippot
Colloque sur la Modélisation des Systèmes Réactifs (MSR), 2019
Dans cet article, nous proposons une approche pour la reconfiguration de la commande des systèmes... more Dans cet article, nous proposons une approche pour la reconfiguration de la commande des systèmes à événements discrets. La contribution est basée sur une synthèse de contrôle sûr de fonctionnement en exploitant une architecture distribuée incluant des événements temporisés. Lorsqu'un défaut est détecté sur un capteur, le contrôleur du comportement normal est reconfiguré en un contrôleur de comportement fautif où des informations temporisées compensent les informations perdues par le capteur défectueux. L'approche est appliquée sur un système simple de transfert de caisses.
Processes
In this paper, we propose a framework to implement a fault-tolerant and a reconfigurable distribu... more In this paper, we propose a framework to implement a fault-tolerant and a reconfigurable distributed control approach in programmable logic controller (PLC) for manufacturing systems (MS). The reconfiguration methodology adopted in this paper is based on supervisory control theory (SCT), and it is triggered following sensor fault detection. The lost information about these sensors is replaced by timed information allowing the MS to continue its operations. The switch from a normal behavior to a degraded behavior when a sensor fault appears is ensured by reconfiguration rules. The main objective of our framework is to implement the obtained control into a PLC. To meet this objective, the distributed controllers of the two operating modes as well as the reconfiguration rules are interpreted into different Grafcet models. The implementation of these different models is verified by a checker-model technique before being tested on a digital twin and validated on a real MS.
J3eA
L’apprentissage de l’automatisme s’adresse aujourd’hui à un public d’étudiants ayant pour la plup... more L’apprentissage de l’automatisme s’adresse aujourd’hui à un public d’étudiants ayant pour la plupart avant tout un background informatique. Ils/elles passent par des phases d’apprentissage de langages compilés et/ou interprétés. Il est compliqué alors pour eux de passer d’une réflexion informatique avec un langage venant du monde de l’IT (Information Technology) vers la programmation d’Automates Programmable Industriel (API), au comportement cyclique, synchrone et aux langages normalisés (IEC 61131-3) issu du monde de l’OT (Operational Technology). Ce papier présente une proposition de mise en place d’un connecteur logiciel entre ces deux mondes aux travers de l’utilisation d’un logiciel de simulation de Parties Opératives Factory I/O (realgames.co) et du langage Python.
HAL (Le Centre pour la Communication Scientifique Directe), Jun 21, 2022
Le Système Cyber-Physique de Production Modulaire (SCPPM) est un système cyber-physique répondant... more Le Système Cyber-Physique de Production Modulaire (SCPPM) est un système cyber-physique répondant aux exigences des systèmes de production modernes. Il est construit à partir de modules de production autonomes possédant leur propre système de commande, indépendant énergétiquement et pouvant être assemblés sur le principe de « plug and produce ». Il intègre des éléments modulaires aussi bien dans la partie physique que dans la partie logicielle et dans la partie Interface Homme Machine pour proposer une vision holistique des modules de production. Le système de commande est implémenté grâce à la norme IEC 61499 qui est spécifiée pour la distribution de la commande et la communication avec l'interface homme machine utilise le protocole OPC UA.
Algebraic Synthesis of Safety Logical Filter on Manufacturing Systems
IFAC-PapersOnLine, 2022
2009 European Control Conference (ECC), 2009
Optimal controller for manufacturing systems by decentralized approach
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Définition Reims, le 23 mai 2019 12 3 ème révolution industrielle 1968 : Pour répondre à un appel... more Définition Reims, le 23 mai 2019 12 3 ème révolution industrielle 1968 : Pour répondre à un appel d'offre de GM, Bedford Associates (Massachusetts) fabrique le 1er automate programmable au monde : Le 084 (84 e projet). L'entreprise Modicon développe, fabrique, vend et maintient ce nouveau produit (absorbée en 1996 par Schneider Electric)
Manufacturing Tasks Synchronization by Algebraic Synthesis
IFAC-PapersOnLine, 2021
Methodology for Railway Automation Study and Automatic Generation of PLC Programs
IEEE Intelligent Transportation Systems Magazine, 2018
This paper presents an original approach to standardization of Electrical Traction's work of ... more This paper presents an original approach to standardization of Electrical Traction's work of railway. This approach was developed within an industrial thesis, financed by the SNCF (French acronym for National Society of French Railways) in association with the CReSTIC (Research Center in Information and Communication Science and Technologies), laboratory of university of Reims Champagne-Ardenne. It consists of two axes of improvement. The first one concerns the standardization and automatic generation of deliverables (wiring diagrams, PLC programs...) established initially by the systems engineers. Therefore these latter will avoid repetitive tasks which can lead to mental underload and then, focus their attention on cognitive tasks. The second axe of the proposed methodology consists in integrating a robust filter based on the use of safety constraints in a PLC program, so that the safety of the system can be ensured whatever the functional program. Thus, this solution guarantees safety without changing the know-how of the systems engineers. This paper presents only the first axe of the proposed methodology.
Design and Application of a Reconfigurable Control to a Cyber-Physical System
Proceedings of the 17th International Conference on Informatics in Control, Automation and Robotics, 2020
Human design applied to operating light rail studies
11th IFAC,IFIP,IFORS,IEA Symposium on Analysis, Design, and Evaluation of Human-Machine Systems (2010), 2010
Abstract This paper reports on the improvement of the theoretical simulation models by using feed... more Abstract This paper reports on the improvement of the theoretical simulation models by using feedback acquired from the operating data recorded in the field. It permit to take into account the specificity of the light rail lines operation and to evaluate the robustness of a timetable by including the driver and traffic controller's behavior. Whether he is at the commands of his train or at line management, the main actor in railway operation is the human operator. His behavior deserves to be included with precision in the theoretical studies. We demonstrate the importance to have a reliable model of the driver behavior on case with a specific operation.
1st IFAC Workshop on Dependable Control of Discrete Systems (2007), 2007
This paper proposes an unconditional decentralized structure to realize the fault diagnosis of Di... more This paper proposes an unconditional decentralized structure to realize the fault diagnosis of Discrete Event Systems (DES), specially manufacturing systems with discrete sensors and actuators. This structure is composed on the use of a set of local diagnosers, each one of them is responsible of a specific part of the plant. These local diagnosers are based on a modular modelling of the plant in order to reduce the state explosion. Each local diagnoser uses event-based, state based and timed models to take a decision about fault's occurrences. These models are obtained using the information provided by the plant, the controller and the actuators reactivity. All local diagnosis decisions are then merged by a Boolean operator in order to obtain one global diagnosis decision. Finally, the diagnosers are polynomial-time in the cardinality of the state space of the system. This approach is illustrated using an example of manufacturing system.
Elaboration of distributed optimal controller for manufacturing systems through synthesis approach
2011 International Conference on Communications, Computing and Control Applications (CCCA), 2011
... Type Membership Constraints IF tal THEN tA+ IF tllQ THEN tA-IF tA+ THEN t A-Cylinder A IFtA-T... more ... Type Membership Constraints IF tal THEN tA+ IF tllQ THEN tA-IF tA+ THEN t A-Cylinder A IFtA-THEN tA+ IF tllQ THEN tal IF tal THEN tllQ IF t A+ THEN tllQ IF t A-THEN tal IF tbl THEN tB+ '" IF tbo THEN tB-'" Q) IF tB+ THEN tB-I: Q) IF tB-THEN tB+ ... [20] Marange P., Tajer A ...
Decentralized diagnosis based on Boolean discrete event models: application on manufacturing systems
International Journal of Production Research, 2008
This paper proposes a decentralized structure based on a set of local diagnosers to monitor discr... more This paper proposes a decentralized structure based on a set of local diagnosers to monitor discrete event manufacturing systems with discrete sensors and actuators. The occurrence of any fault entailing the violation of the desired behaviour must be detected and isolated by at least one local diagnoser using its own local observation about the system execution. These local diagnosers infer the fault's occurrence using event sequences, time delays between correlated events and state conditions, characterized by sensors readings and commands issued by the controller. A very limited communication among diagnosers is permitted through a simple coordinator based on a set of rules. The goal is to solve the problem of diagnosis's decision ambiguity due to the partial observation of diagnosers. An adapted codiagnosability notion is formally defined in order to ensure that the set of local diagnosers is able to diagnose all faults entailing the violation of the desired behaviour within a bounded delay. We show that the construction of these diagnosers is polynomial in the size of the system. An example is used to illustrate the proposed approach.
Control Engineering Practice, 2011
This paper presents a discrete event model-based approach for Fault Detection and Isolation of ma... more This paper presents a discrete event model-based approach for Fault Detection and Isolation of manufacturing systems. This approach considers a system as a set of independent Plant Elements (PEs). Each PE is composed of a set of interrelated Parts of Plant (PoPs) modeled by a Moore automaton. Each PoP model is only aware of its local behavior. The degraded and faulty behaviors are added to each PoP model in order to obtain extended PoP ones. An extrapolation of Gaussian learning is realized to obtain acceptable temporal intervals between the time occurrences of correlated events. Finally based on the PoP extended models and the links between them, a fault candidates' tree is established for each plant element. This candidates' tree corresponds to a local on-line fault event occurrence observer, called diagnoser. Thus, the diagnosis decision is distributed on each plant element. An application example is used to illustrate the approach.
Méthodologie de modélisation dans le cadre de la synthèse formelle des SED
… d'Automatique (CIFA'04), …, 2004
... alexandre.philippot, abdelouahed.tajer, francois.gellot, veronique.carre@univ-reims.fr http:/... more ... alexandre.philippot, abdelouahed.tajer, francois.gellot, veronique.carre@univ-reims.fr http://cifa2004.ec-lille.fr/ ... Le préhenseur qui illustre le papier est présenté succinctement figure 2.a et 2.b. Il a pour rôle de saisir un pignon dans un tiroir pour ensuite le déposer sur un axe. ...
International Conference on Informatics in Control, Automation and Robotics, 2005
The diagnosis is defined as the process of detecting an abnormality in the system behavior and is... more The diagnosis is defined as the process of detecting an abnormality in the system behavior and isolating its causes or sources. Not all the systems are diagnosable. Thus, before Appling a method to diagnose a system, we need to know if this system is diagnosable according to the set of failures required to be detected and isolated. This paper presents an algorithm to determine if a system is detectable or not, i.e., if we can know, at each instant, whether the system works under a normal or abnormal functioning state. In the case that the system is detectable, this algorithm determines if this system is diagnosable. This algorithm combines event and state based approaches in order to maximise the diagnosability power with a minimum number of sensors. In addition, the time is integrated and modelled with fuzzy intervals to enhance this diagnosabilty power and to take into account the imprecision of events occurrences instants. An example of manufacturing system is used to illustrate the functioning of this algorithm.
Decentralized approach for fault diagnosis of discrete event systems
International Conference on Informatics in Control, Automation and Robotics, 2007
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Papers by Alexandre Philippot