Dissertations / Theses on the topic 'Tolérance méthodologique'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 15 dissertations / theses for your research on the topic 'Tolérance méthodologique.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Chamseddine, Abbas. "Méthodologie de diagnostic et tolérance aux défauts de systèmes complexes." Aix-Marseille 3, 2007. http://www.theses.fr/2007AIX30048.
Full textThe aim of this work is to propose a methodology of fault diagnosis and fault-tolerant control for complex systems. In this work, both sensor and actuator faults are considered. The problem of complex systems instrumentation is studied. In a first step, we design a minimal number sensor network ensuring the system observability. This minimal number network verifies system's observability but it is not robust in the presence of sensor faults: the breakdown of one sensor may lead to the loss of system's observability. We propose then an approach to design a robust sensor network. Finally, we propose a methodology to design a sensor network ensuring the diagnosability of actuator faults in complex systems. These approaches are formulated as nonlinear binary optimization problems. They are illustrated and validated in simulation using a realistic model of vehicle active suspension
Yettou, Abdelhalim. "Méthodologie de conversion des spécifications géométriques de tolérance en zones d'incertitude." Mémoire, Université de Sherbrooke, 2011. http://savoirs.usherbrooke.ca/handle/11143/1624.
Full textMarkvoort, Laurent. "Méthodologie d'analyse statistique de tolérances dans les assemblages impliquant des composants déformables." Valenciennes, 2007. https://ged.uphf.fr/nuxeo/site/esupversions/fcddf462-542e-4eb5-b6a5-a98acbaaeab5.
Full textThe thesis justifies and details an original methodology for performing statistical tolerance analysis taking into account the compliance of components within a mechanical assembly. The methodology, called STA-DEF, combines a statistical tolerance analysis (STA) based on a Monte Carlo simulation, and a Finite Element Analysis of the deformations (DEF) occurring on the components of the assembly due to mounting or operational constraints. The method uses, for input, an assembly model, a proposed tolerancing scheme, one or several functional condition(s) to be checked and some knowledge about the assembly process (sequence and technology). For output, the method generates a statistical distribution of the functional conditions, as well as an ordered list of contributors, i. E. : of the tolerances having a significant influence on the condition. The computation of contributors uses the FAST sensitivity analysis method, applied on a response surface determined by means of the inputs of STA-DEF and the distributions of the verified functional conditions. This method has been implemented on the basis of usual software tools (such as eM-tolmate, Abaqus, SimLab) supplemented with specific developments on Matlab. An industrial case study (a pressure sensor in a commonrail injection system) has been successfully analyzed to validate the method and the prototype
Caux, Mickael. "Méthodologie de maîtrise des variations géométriques des produits en conception, fabrication et contrôle dans le contexte de l'usine numérique." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00777192.
Full textKhelassi, Ahmed. "Nouvelle méthodologie de synthèse de lois de commande tolérante aux fautes garantissant la fiabilité des systèmes." Electronic Thesis or Diss., Nancy 1, 2011. http://www.theses.fr/2011NAN10041.
Full textThe works developed in this thesis deal with the active fault tolerant control design incorporating actuators reliability. This new methodology requires the adaptation of the reliability analysis tools with the system control field. The explicit integration of load in the actuators reliability models is considered. First, the reconfigurability analysis of fault tolerant control systems is treated. A reliable reconfigurability analysis based on the energy consumption with respect to overall system reliability is presented. A reconfigurability index which defines the functional limitation of the system is proposed based on fault severity and actuators reliability degradation. The second part of the developed works is devoted to control allocation and re-allocation. Two approaches of control re-allocation are proposed by taking into consideration actuator degradation health. The control inputs are applied to the system with respect to actuators reliability and faults. The third part contributes to a fault tolerant controller design incorporating actuator criticality. A sensitivity analysis of the overall system reliability and criticality indicator are proposed. A new method of active fault tolerant control is developed with Linear Matrix Inequality (LMI) formulation based on actuator criticality
Khelassi, Ahmed. "Nouvelle méthodologie de synthèse de lois de commande tolérante aux fautes garantissant la fiabilité des systèmes." Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00618655.
Full textPira, Clément. "Une méthodologie pour appréhender la décision collective dans des systèmes multiagents sujets aux défaillances." Paris 6, 2009. http://www.theses.fr/2009PA066771.
Full textBougerol, Antonin. "Modes de défaillance induits par l'environnement radiatif naturel dans les mémoires DRAMs : étude, méthodologie de test et protection." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00610137.
Full textJallouli, Mehdi. "Méthodologie de conception d'architectures de processeur sûres de fonctionnement pour les applications mécatroniques." Thesis, Metz, 2009. http://www.theses.fr/2009METZ006S/document.
Full textNowadays, embedded systems are becoming increasingly attractive for many applications. Furthermore, these systems should be more and more dependable. Indeed, systems such as mechatronic or automatically controlled ones often work in harsh environmental conditions making them more prone to errors due to disturbances. Thus, designers should consider ways to protect them against such errors. In this work, a special interest is dedicated to processor architecture dependability as we consider processor-based systems. The stack computer philosophy has been chosen for the processor architecture in order to achieve a good trade-off between simplicity and effectiveness. Our approach to introduce and evaluate the dependability is based on the development and the use of a software emulator of the processor to be designed. Dependability of the processor is ensured through the collaborative use of hardware and software protection techniques: hardware error detection means and software error correction means. The correction technique is implemented in benchmarks and is validated on the emulator through a simulation of various scenarios of errors appearance. Different parameters are evaluated such as correction capability and time overhead. This correction technique is independent from the target application and from the detection means, what confirms the methodological aspect of our approach. Otherwise, as requested by the CIM’tronic project, we integrated our work with the CRAN Nancy/A3SI Metz one by applying the information flow approach on the processor instruction set. We showed the ability of this approach to evaluate the whole processor/application dependability
Jallouli, Mehdi. "Méthodologie de conception d'architectures de processeur sûres de fonctionnement pour les applications mécatroniques." Electronic Thesis or Diss., Metz, 2009. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2009/Jallouli.Mehdi.SMZ0906.pdf.
Full textNowadays, embedded systems are becoming increasingly attractive for many applications. Furthermore, these systems should be more and more dependable. Indeed, systems such as mechatronic or automatically controlled ones often work in harsh environmental conditions making them more prone to errors due to disturbances. Thus, designers should consider ways to protect them against such errors. In this work, a special interest is dedicated to processor architecture dependability as we consider processor-based systems. The stack computer philosophy has been chosen for the processor architecture in order to achieve a good trade-off between simplicity and effectiveness. Our approach to introduce and evaluate the dependability is based on the development and the use of a software emulator of the processor to be designed. Dependability of the processor is ensured through the collaborative use of hardware and software protection techniques: hardware error detection means and software error correction means. The correction technique is implemented in benchmarks and is validated on the emulator through a simulation of various scenarios of errors appearance. Different parameters are evaluated such as correction capability and time overhead. This correction technique is independent from the target application and from the detection means, what confirms the methodological aspect of our approach. Otherwise, as requested by the CIM’tronic project, we integrated our work with the CRAN Nancy/A3SI Metz one by applying the information flow approach on the processor instruction set. We showed the ability of this approach to evaluate the whole processor/application dependability
Meguetta, Zine-eddine. "Méthodologie de conception sûre de fonctionnement d'un système de contrôle-commande." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10059/document.
Full textThis thesis concerns the design of control system instrumentation architecture. The design of such architectures is a complex activity that requires a global vision of the system. More specifically, it consists to determine the set of instruments (number and type of sensors, actuators), their arrangement according the control system instrumentation. The choice of architecture constrains by main multi criteria's, on the one hand, the cost of the system and the various components that must be minimal, on the other hand, the dependability, which is evaluated in terms of the reliability of fulfillment of the mission of the design system. This field of research aims to unify the different approaches used in automatic in a global design methodology of control system instrumentation. This work proposes a method that aims to optimize the instrumentation using multiple criteria: cost criterion and dependability constraints in terms of reliability, quality of control, quality of performance, fault tolerant level. This design methodology is based on structural modeling. This study will focus on control systems to accomplish various missions without take into account the internal representation of the system (state equations). However, the tool of structural analysis is used for modeling of the system in design phase. The integration of the dependability aspect in the design methodology procedure of control system instrumentation may appear here in the form of the assessment of reliability mission based on structural links between the physical variables and instruments of the system, according to the performance levels and specifications of the required objective design
Semail, Eric. "OUTILS ET MÉTHODOLOGIE D'ÉTUDE DES SYSTÈMES ÉLECTRIQUES POLYPHASÉS. GÉNÉRALISATION DE LA MÉTHODE DES VECTEURS D'ESPACE." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2000. http://tel.archives-ouvertes.fr/tel-00266256.
Full textTout d'abord, on caractérise les modulateurs d'énergie indépendamment de leurs charges. Pour cela des espaces vectoriels leur sont associés ainsi que des familles de vecteurs qui les caractérisent. Il est possible alors de définir quel type de charge le modulateur est capable de contrôler. Les degrés de liberté de la commande trouvent également une formulation mathématique. Les exemples traités sont les onduleurs de tension monophasé et triphasé deux niveaux. L'approche conduit, dans le cas d'une commande aux valeurs moyennes, à un calcul original des durées de conduction des interrupteurs en utilisant la notion de barycentre. Les algorithmes obtenus, généralisables aux onduleurs à n bras, comportent un nombre réduit d'opérations logiques et arithmétiques.
Le formalisme est ensuite appliqué à la machine asynchrone triphasée avec q barres au rotor ; ceci nous permet d'expliciter la notion de rotor diphasé équivalent. La machine asynchrone pentaphasée est également modélisée et l'approche développée met en évidence les conditions que doit remplir l'onduleur à 5 bras pour l'alimenter correctement.
Dans la dernière partie, un onduleur de courant à Modulation de Largeur d'Impulsions est étudié à l'aide du formalisme. Les non-linéarités de la commande sont prises en compte vectoriellement, notamment, de façon originale, celle concernant la durée minimale de conduction des interrupteurs. On décrit enfin l'implantation matérielle de cette commande sur microcontrôleur 16 bits et présente les résultats expérimentaux dans le cas d'une charge constituée d'une machine asynchrone triphasée en parallèle avec des condensateurs.
Bougerol, A. "Modes de défaillance induits par l'environnement radiatif naturel dans les mémoires DRAMs : étude, méthodologie de test et protection." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00611100.
Full textSgro, Nathalie. "Le rejet dogmatique d'autrui : analyse des fonctionnements cognitifs et appartenance idéologique." Clermont-Ferrand 2, 2004. http://www.theses.fr/2004CLF20005.
Full textBricas, Gaëtan. "Radiation reliability analysis of FPGA-based systems : testing methodologies and analytical approaches." Electronic Thesis or Diss., Université de Montpellier (2022-....), 2022. http://www.theses.fr/2022UMONS070.
Full textThis work focuses on testing methodologies to analyze the radiation sensitivity of FPGA-based systems. Due to their flexibility, the reliability analysis on these components is a challenging task as the radiation sensitivity is entirely conditioned by the implemented system. Indeed, it depends on the one hand on the intrinsic sensitivity of the component (to both TID and SEEs) and, on the other hand, on the way the different induced perturbations can impact the operation of the implemented system. State-of-the-art methodologies have shown a number of limitations in bridging the intrinsic sensitivity of the FPGA and the one of the implemented systems. The objective of this thesis is to improve radiation testing methodologies to overcome these limitations.Concerning TID effects, a new testing methodology is proposed. Its main contribution is to extend the evaluation of parametric degradations to all logical and routing resources of the component. For this purpose, specific benchmarking structures have been developed to measure the propagation delay deviation of each type of logical and routing resource. A new technique to measure the propagation delay in real time and with limited external instrumentation is also proposed. X-ray radiation tests have been performed on three FPGA families to highlight the benefits of this methodology.As for SEE, the proposed testing methodology lies between the two traditional accelerated particle beam testing approaches (primitive level testing and final application testing) by proposing a sensitivity evaluation at a higher level of granularity. The basic idea is to instantiate a set of dedicated benchmarking structures, simple enough to provide a good testability (low error masking, traversable state spaces) while sufficiently complex to provide a good representativity of the circuits effectively implemented on FPGAs. The benchmarks selected in this study are based on arithmetic operations. By using different implementations of the same arithmetic functions with a large diversity in the circuit parameters, and in the use of resources, the radiation tests fulfill a multifaceted purpose. First, the test results provide extensive information to identify and understand the different failure mechanisms and their predominance; second, it allows to qualitatively evaluate the impact of different types of resources on the global system sensitivity and to quantitatively compare the sensitivity of different implementations of the same logic function and the effectiveness of mitigation solutions. Finally, it provides a set of guidelines for designers to improve the reliability of FPGA-based systems. Several neutron and proton beam tests have been performed to demonstrate the advantages of this approach.The main limitation of radiation testing lies with the difficulty to extrapolate the results of tests performed with a given implemented circuit to estimate the sensitivity of any other circuit. To address these limitations, a new software-based approach has been developed to estimate the susceptibility of circuits implemented on SRAM based FPGA to configuration memory corruptions. This analytical approach uses the physical netlist of the circuit and explores the different nodes and logical resources that compose it to extract all the configuration bits that are critical for the system operation. The main contribution of this approach is to take into account the workload of the circuit, extracted from logic simulation, to analyze the propagation of errors and thus filter among the set of potentially critical configuration bits, those that actually modify the output signals of the system. The efficiency of this approach is validated through fault injection and proton experiment