Tesis sobre el tema "Carte de contrôle statistique des processus"
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Tiplica, Teodor. "CONTRIBUTIONS A LA MAITRISE STATISTIQUE DES PROCESSUS INDUSTRIELS MULTIVARIES". Phd thesis, Université d'Angers, 2002. http://tel.archives-ouvertes.fr/tel-00739919.
Texto completoZhang, Ying. "Maîtrise statistique des procédés avec paramètres estimés". Ecole centrale de Nantes, 2011. http://www.theses.fr/2011ECDN0018.
Texto completoStatistical Process Control (SPC) is an effective approach for improving quality and productivity of aproduction process. Among the SPC tools, control chart, as themost important and primary tool, has been widely used to monitor and determine whether a production process is in-control or not. An indispensable assumption for the development of control charts is that the process parameters (the in-control mean and standard-deviation) are assumed known. In practice, the distribution of the data and the process parameters are rarely known, and the process parameters are usually estimated from an in-control historical data set (Phase I). When these parameters are estimated, the performance of the control charts differs from the known parameters case. Recently, some authors have studied the impact of the parameters estimation, but more work is needed. In this thesis, we will investigate the properties (in terms of theRun Length) of some control charts for the mean inthe case of estimated parameters,which have not been researched till now, such as Run Rules Chart, Synthetic Chart, VSI Chart and VSS Chart. The first goal of this thesis is to evaluate the performance of these control charts when the process parameters are estimated, to compare them with the case when the process parameters are assumed known and to demonstrate that the performance is quite different especially when the number of samples used during the Phase I is small. The second goal of this thesis is to suggest the sample sizes and to provide new optimal chart constants for calculating the limits of these control charts in the case of estimated parameters, which are very useful in practice
Zaidi, Fatima Sehar. "Development of statistical monitoring procedures for compositional data". Thesis, Nantes, 2020. http://www.theses.fr/2020NANT4006.
Texto completoStatistical Process Monitoring (SPM) is a widely used methodology, based on the implementation of control charts, for achieving process stability and improving capability through the reduction of the process variability. The selection of a suitable control chart depends on the type and distribution of he data. When there are several quality characteristics, multivariate control charts have to be adopted. But there is a specific category of multivariate data which are constrained by definition and known as Compositional Data (CoDa). This thesis makes an attempt to systematically propose new control charts for the for compositional data that have not yet been proposed so far in the literature. Hotelling T2-CoDa control chart in the presence of measurement error and MEWMACoDa control chart in the presence of measurement error has been proposed for compositional data. Furthermore, some nonparametric charts to monitor compositional data has also been proposed. The performance of each control chart has been studied and the optimal parameters have systematically been evaluated. Real life compositional data examples have been used in order to study the performances of the proposed charts
Achouri, Ali. "Cartes de contrôle pour le coefficient de variation". Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=7658d471-1a91-4022-9493-9f85b2a06a86.
Texto completoThe Statistical Process Control (SPC) is an effective method based on statistics and used to monitor production. Control charts are the most important and primary tools of SPC. An indispensable assumption for the development of control charts is that the process parameters μ0 and 0 are assumed constant. In practice, the process parameters are often variables and the use of the coefficient of variation seems to be an interesting alternative. In this thesis, we will investigate the properties (in terms of the Run Length) of some control charts for the coefficient of variation in the case of known parameters, which have not been researched till now, such as Run Rules Chart, VSI Chart and VSS Chart. In addition, a Shewhart control chart for the coefficient of variation with estimated parameters is proposed. The performance of each control chart has been evaluated and the optimal parameters were systematically computed. An empirical validation of the results has been developed for real industrial processes
Amdouni, Asma. "Surveillance statistique du coefficient de variation dans un contexte de petites séries". Nantes, 2015. http://archive.bu.univ-nantes.fr/pollux/show.action?id=dcf36868-32b2-41d6-916b-f9533ee12902.
Texto completoStatistical Process Control (SPC) is a method of quality control based on statistics and used to monitor production. Monitoring the coefficient of variation is an effective approach to SPC when the process mean µ and standard deviation σ are not constant but their ratio is constant. Until now, research has not investigated the monitoring of the coefficient of variation for short production runs. Viewed under this perspective, in this thesis, we will propose new methods to monitor the coefficient of variation for a finite horizon production, we will investigate the properties (in terms of the Truncated Run Length) of some control charts for the coefficient of variation in a Short Run context in the case of known parameters, such as the one-sided Shewhart Chart, the Run Rules Chart, the VSI and VSS Charts. The performance of each control chart has been evaluated by developing statistical measures of performance appropriate in a Short Run context and the optimal parameters were systematically computed. An empirical validation of the results has been developed for real industrial processes
Cohen, Achraf. "Détection et diagnostic des fautes dans des systèmes complexes par approches multi-échelle". Thesis, Angers, 2015. http://www.theses.fr/2015ANGE0085.
Texto completoBecause of the process complexity (multi-scale data, large number of characteristics variables and etc.), process monitoring has become a big challenge in control engineering, in order to assure quality and safety of processes. In this thesis work, we are interested in multi-scale monitoring approaches, which are based on combination between wavelet analysis and data-driven techniques. Firstly, we have established a general framework of statistical distribution of the wavelet coefficients (approximations and details) as part of the multi-resolution analysis. Indeed, we derived the distribution parameters of wavelets coefficients. Then, we developed new control charts for mean change (AJ , OWave, BiWave-T2 et BiWave-MEWMA), variance change (DeWave) and mean/variance change (AJ-DeWave scheme). In addition, we shown equivalencies between statistical control techniques and wavelet transforms. Moreover, a new technique -CoWave- is proposed, in order to estimate the mean change time (fault isolation). The CoWave is equivalent to the maximum likelihood estimator. Finally, statistical characteristics of wavelets coefficients in the case of autocorrelated and non-normal data are presented
Latrous, Mohamed Othman. "Modèle d’intégration maintenance conditionnelle, prévisionnelle et maitrise statistique des procédés". Electronic Thesis or Diss., Compiègne, 2021. http://www.theses.fr/2021COMP2639.
Texto completoIntegrated solutions are evolving to cope with the digitalization of manufacturing processes. One area of improvement is developing new strategies joining maintenance and quality control. A popular hypothesis used in these integrated models is considering that quality control comes down to monitoring a single process or product characteristic. However, for complex systems, this assumption is seldom satisfied as the number of characteristics grows and they can have potential correlations. In fact, a multivariate control chart is more suitable to guarantee better performances of drift detection. Following this perspective, the main objective of this thesis consists in developing new maintenance decision rules based on produced items’ quality data. Multivariate control charts are used to provide detection and identification of potential process shifts and adaptive maintenance actions are triggered, targeting system components responsible for the deterioration of the produced items’ quality. First, a preliminary study is led to highlight the impact of multivariate control charts on the decision making process. Next, integrated maintenance decision rules for condition based and predictive maintenance are proposed using multimodal control charts. The developed decision rules are applied in the context of a simulated manufacturing process exhibiting a quality defect appearing in different dynamics (fast and slow drifts). The new strategies proposed in this thesis have been validated through the development of analytical models expressing the profit of the manufacturing system. This profit was maximized based on decision variables (sampling period and critical intervention threshold) and the existence of optimal solutions has been demonstrated through simulation. The robustness of the developed models has been proven by sensitivity studies, followed by comparative studies in order to highlight the impact of the proposed strategies
Guidez, Ludovic. "Conception de cartes de contrôle assistée par ordinateur et calculs de capabilités appliqués aux processus non gaussiens : application à la production d'embrayages". Compiègne, 1997. http://www.theses.fr/1997COMP1068.
Texto completoAbubakar, Aminu Sahabi. "Contribution to the development of new maintenance strategies integrated to control charts for a production process under service levels, operational, and quality constraints". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0055.
Texto completoThe current production industry is characterise by significant progress: a massive increase in high technology, the emergence of exigent customers, competitive markets, varied product quality, and random demands required the collaborations of the inter-related aspects of production. The production, maintenance, and quality are the most critical aspects of the industrial system. We are interested in optimising maintenance that plays a critical role in customer satisfaction, sustainability, and the development of companies. Our study is centred on developing production and maintenance integrated into a control chart of quality policy. We propose new integrated maintenance strategies with an in-depth analysis of the continuous production process reliability improvements and treated under customer requirements (Service, quality, and cost) constraints. The integration and optimal coordination of these factors of production is not easy and represent a challenge for industrial companies, and are more challenging with multi-assignable causes of production process variation. To address this problem, this research work employed the use of a control chart tool in combination with the AFNOR principles known as Rule of seven as involved in quality management. To monitor, analyses and direct appropriate maintenance actions for continuous system reliability improvements along the different multiple process scenarios as decision levels. We use the interactions between the production process and product quality for strategies of maintenance which reduce the failure of the production system by improving process reliability and reducing the no conformal products. The study Significantly focused on quality, quality tools, and their applications in production and maintenance control. The technique we used to optimise the maintenance and quality control of an integrated production system is a control chart tool based on statistical measurement and analysis of quality parameters. We model different production problems and develop a control policy for randomly failing production systems that must satisfy customer requirements dynamically throughout the finite production horizon. We introduced a mathematical model to minimise the total costs of production, inventory, maintenance, and quality control. The optimisation of the maintenance strategy was integrated into a control chart tool information. Based on the production rate variation and its impact on machine degradation the number of maintenance, times, and intervals needed for prudent decision-making is determined by the developed algorithm. In this context, this research presents the derivation for different cases of all the probabilities for the process to be in or out of control, the average run lengths, and the restoration cycle durations. Based on the degradation factor, new failure rate equations are formulated, and then the average failure rate for each case, we formulated different maintenance cost optimisation models. The proposed approach is useful for precise calculation and minimisation of the total maintenance cost. Which optimises total production cost considering all possible production process statuses due to multiple causes. Our work contributes to the emergence of quality management and performance improvement techniques that will contribute to the development of production companies
Le, Gall Caroline. "Algorithmes de détection de ruptures et statistiques spatiales : applications au diagnostic de défaillances dans un procédé de fabrication". Toulouse 3, 2002. http://www.theses.fr/2002TOU30176.
Texto completoThe continuous improvement of the yield of a production line is a significant goal for the competitiveness of the facility. In the context of integrated circuit manufacturing, the introduction of new increasingly complex technologies makes the statistical tools traditionally used insufficient to prevent process failures. Consequently, new statistical techniques have been developed to improve or replace some existing tools and also to form some new ones. Thus, an improvement process is proposed. When a decrease of yield is observed, it first needs to be characterized. The characterization is achieved by a spatial analysis of the silicon wafers on which the integrated circuits are manufactured. . .
Julien, Fabrice. "Contribution à la mise en place de la maîtrise de la qualité dans une production de petites séries : application aux spécificités de la production aéronautique". Compiègne, 2009. http://www.theses.fr/2009COMP1804.
Texto completoIn an economical global situation more and more demanding, the importance of quality is evident, either in the industrial sector or in the business services. Whatever the quality level reach by each company, it's in a dynamic trend who put it in a perpetual motion with a goal of continuous improvements. Our arrival at Airbus Méaulte was in a specific CIFRE agreement context. The initial aim was to deploy the Statistical Process Control (SPC) methodology and especially in the multivariate case. As a first step, we've done two parallel actions. On one side, we've done a state of the art for the quality improvement methodology in general, and of the SPC in a more accurate manner. On the other side, we've analyzed the industrial situation that we've found. The choice we've done for our work led us to work in three other complementary ways : the improvement methodology, the permanent cultural change management caused by new tooling introduction, the creation of a decision making tool based on the development of follow-up chants and global indicators
Campillo, Fabien. "Quelques applications des processus de diffusion: filtrage/statistique - contrôle - homogénéisation". Habilitation à diriger des recherches, Université Rennes 1, 2004. http://tel.archives-ouvertes.fr/tel-00485401.
Texto completoRahali, Dorra. "Surveillance Statistique du Temps et de l'amplitude entre événements". Thesis, Nantes, 2020. http://www.theses.fr/2020NANT4017.
Texto completoStatistical process monitoring First we will study the case where we assume (SPM) are mainly based on control charts that the time T and the amplitude X are two which constitute an important step in the quality mutually independent continuous random process. There is a need to develop monitoring variables. Then we study the case where the techniques in manufacturing or non- variables are dependent using Copulas as a manufacturing sectors. This leads to give an mechanism to model the dependence. Finally increasing importance to Time Between Events we discuss the case where the time between and Amplitude (TBEA) control charts. events Tis an univariate random variable and However, few researchers have been the amplitude X is no longer an univariate interested to propose methods to random variable but a multivariate random simultaneously monitor the time between an vector. The performance of each control chart event E and its amplitude. Until now, the vast has been evaluated by EATS. An empirical majority of contributions are limited to a validation of the results has been developed for reduced number of statistics and potential real cases. distributions. ln this thesis we will investigate simple Shewhart type control charts for several statistics and many distributional scenarios
Tiplica, Teodor. "Contributions à la maîtrise statistique des processus industriels multivariés". Angers, 2002. http://www.theses.fr/2002ANGE0046.
Texto completoTran, Kim Phuc. "Surveillance de procédés de type mélange". Thesis, Nantes, 2016. http://www.theses.fr/2016NANT4047/document.
Texto completoIn industry, Statistical Process Control (SPC) is a set of statistical techniques to monitor, control and improve a process. Among SPC tools, control charts are very useful tools for the detection and the elimination of assignable causes shifting the process. There exist manufacturing environments where several components have to be mixed together to obtain a product composition. In this case, it is necessary to monitor ratios of quality variables when quality practitioners are interested in the relative comparison of the same property for two components. In this thesis, we have tried to systematically propose new control charts for the ratio and for compositional data that have not yet been proposed so far in the literature. Run rules control charts, EWMA control charts, CUSUM control charts and a Shewhart control chart in the presence of measurement error have been proposed for monitoring the ratio. Furthermore, a MEWMA control chart to monitor compositional data has also been proposed. The performance of each control chart has been evaluated and the optimal parameters have systematically been computed. An empirical validation of the results has been developed for real industrial processes
Nourelfath, Mustapha. "Extension de la théorie de la supervision a la surveillance et a la commande des systèmes a évènements discrets : application à la sécurité opérationnelle des systèmes de production". Lyon, INSA, 1997. http://www.theses.fr/1997ISAL0066.
Texto completoWe propose a monitoring and control approach based on the Supervisory Control Theory (SCT) initiated by Ramadge and Wonham (RW) works. The work is split in two complementary parts. The first concerns the control and the supervision in nominal mode. The second part is related to monitoring to ensure the continuity of system operation in the presence of critical failures. In the RW approach, a process is assumed to generate events spontaneously and the supervisor has the ability to forbid some controllable events. Nevertheless real systems usually require the addition of an external control system that forces some events to occur. To bridge the semantic gap between control and the RW model, we propose an extension of SCT based on a relaxation of the controllability concept. Furthermore we introduce a monitoring module (MM) based on the Operational Safety concept and on the RW theory synthesis issues. MM contains the functions of detection/observation and compensation/recovery. The reactivity is based on the following procedure: at the detection of a failure, the observer activates a compensator which freezes the conflictual nominal supervisors, liberated only after recovery. The modelling of such mode alternations is based on the macro action concept. In the SCT context, macro actions are represented by Boolean variables to deal with the controllability of the global system. This proposition allows the formal validation of admissible degraded functioning specifications and the synthesis of the compensation of critical failures. The concepts developed have been applied to the fairly complex manufacturing system of the "Atelier Inter-établissements de Productique" (AIP) Dauphiné-Savoie (France)
Muller, Alexandre. "Contribution à la maintenance prévisionnelle des systèmes de production par la formalisation d'un processus de pronostic". Nancy 1, 2005. http://docnum.univ-lorraine.fr/public/SCD_T_2005_0015_MULLER.pdf.
Texto completoToday, due to the emergence of “sustainability” constraint within Enterprise, the industrial people have to integrate in the development strategy, not only the conventional economical finality but also the social and environmental requirements. At the Manufacturing Execution System (MES) level, this objective is materialised through the concept of “System Maintaining in Operational Conditions” (SMOC). In order to improve the SMOC efficiency, this thesis outlines the formalisation of the key Predictive Maintenance process which is the prognosis one. The deployment of the prognosis process follows a methodology based both of probabilistic and event approaches. The probabilistic model which supports the prognosis execution, has been developed by means of Dynamic Bayesian Networks (DBN). The feasibility and added value of this new prognosis is experimented on the manufacturing TELMA platform supporting the unwinding of metal bobbin
Assoul, Samia. "Contribution à la réalisation d'un système interactif d'aide à l'amélioration de la qualité des processus de fabrication". Lyon 1, 1996. http://www.theses.fr/1996LYO19005.
Texto completoBabus, Florina. "Contrôle de processus industriels complexes et instables par le biais des techniques statistiques et automatiques". Phd thesis, Université d'Angers, 2008. http://tel.archives-ouvertes.fr/tel-00535668.
Texto completoGruet, Pierre. "Quelques problèmes d'estimation et de contrôle optimal pour les processus stochastiques dans un cadre de modélisation des prix des marchés de l'électricité". Sorbonne Paris Cité, 2015. https://theses.hal.science/tel-01238618.
Texto completoIn this thesis, we study mathematical models for the representation of prices on the electricity markets, from the viewpoints of statistics of random processes and optimal stochastic control. In a first part, we perform estimation of the components of the volatility coefficient of a multidimensional diffusion process, which represents the evolution of prices in the electricity forward market. It is driven by two Brownian motions. We aim at achieving estimation efficiently in terms of convergence rate and, concerning the parametric part of those components, in terms of limit law. To do so, we must extend the usual notion of efficiency in the Cramér-Rao sense. Our estimation methods are based on realized quadratic variation of the observed process. In a second part, we add model error terms to the previous model, in order to tare for some kind of degeneration occurring in it as soon as the dimension of the observed process is greater than two. Our estimation methods are still based on realized quadratic variation, and we give other tools in order to keep on estimating the volatility components with the optimal rate when error terms are present. Then, numerical tests provide us with some evidence that such errors are present in the data. Finally, we solve the problem of a producer, which trades on the electricity intraday market in order to tope with the uncertainties on the outputs of his production units. We assume that there is market impact, so that the producer influences prices as he trades. The price and the forecast of the consumers' demand are modelled by jump diffusions. We use the tools of optimal stochastic control to determine the strategy of the producer in an approximate problem. We give conditions so that this strategy is close to optimality in the original problem, as well as numerical illustrations of that strategy
Gibert-Doutre, Marie-Françoise. "Développement d'une approche pour le contrôle qualité à partir de l'analyse de données et de la morphologie mathématique". Compiègne, 1991. http://www.theses.fr/1991COMPD354.
Texto completoCollignon, Roland. "Gestion temps réel de la qualité d'une ligne d'embouteillage, apport de la méthode de maîtrise statistique des procédés". Nancy 1, 1997. http://docnum.univ-lorraine.fr/public/SCD_T_1997_0012_COLLIGNON.pdf.
Texto completoHuynh, Khac Tuan. "Qualification de l'apport de l'information de surveillance dans la prise de décision en maintenance". Troyes, 2011. http://www.theses.fr/2011TROY0013.
Texto completoCondition and health monitoring can bring out useful information for the maintenance decision-making but few models allow their integration in the decision process. This thesis aims to construct new probabilistic quantitative models to evaluate the value of this kins of information depending on ith quality and on the nature of the observed variables. The proposed stochastic failure and measurement models take account the degradation/failure sensor data, the impact of operational environment on the degradation, as well as the nature of control techniques. Based on these models, we propose different maintenance policies and we develop the associated cost model to study the best methods for the exploitation of monitoring information. The studies in this thesis show the advantage of developing quantitative maintenance decision framework which allows integrating and evaluating the impact of condition monitoring information on the performance of maintenance operations
Gerard, Karine. "Optimisation automatique des incidences des faisceaux par l'algorithme du simplexe et optimisation des Contrôles qualité par la Maitrise Statistique des Processus (MSP) en Radiothérapie Conformationnelle par Modulation d'Intensité (RCMI)". Phd thesis, Institut National Polytechnique de Lorraine - INPL, 2008. http://tel.archives-ouvertes.fr/tel-00343370.
Texto completoLe premier axe concernait l'optimisation automatique des incidences des faisceaux. Nous avons pour cela mis en œuvre un algorithme (le simplexe) qui a été intégré dans le système de planification de traitement. Il permet, à partir des objectifs dosimétriques fixés par l'utilisateur, de déterminer automatiquement les incidences de faisceaux optimales : irradiant suffisamment le volume cible tout en épargnant les organes à risques avoisinants. En plus d'un gain en temps, les résultats du simplexe ont montré – sur trois patients atteints d'un cancer de l'oropharynx – un gain en qualité par rapport à une sélection manuelle des faisceaux. En effet, pour une couverture du volume cible équivalente voire meilleure, il permet de réduire la dose reçue par les organes à risques.
Le second axe concernait l'optimisation des contrôles pré-traitement. Nous avons pour cela utilisé une méthode industrielle : la Maîtrise Statistique des Processus (MSP) afin d'analyser rétrospectivement les résultats des contrôles de la dose absolue effectués avec la chambre d'ionisation au Centre Alexis Vautrin (CAV). Cette étude a montré l'intérêt de la MSP pour renforcer la sécurité des traitements grâce à la mise en place de cartes de contrôle. Elle a également montré que notre processus de délivrance de la dose était stable et statistiquement capable pour les traitements de la prostate, ce qui implique qu'une réduction du nombre de contrôles peut être envisagée pour ce type de traitement au CAV.
Denimal, Dimitri. "Déploiement du tolérancement inertiel dans la relation client fournisseur". Phd thesis, Chambéry, 2009. http://tel.archives-ouvertes.fr/tel-00445871.
Texto completoValiani, Virginie. "De l'émergence d'un projet qualité à l'usage d'un logiciel de MSP : les apports de la psychologie du travail et de l'ergonomie". Amiens, 2009. http://www.theses.fr/2009AMIE0001.
Texto completoInfantes, Guillaume. "Apprentissage de modèles de comportement pour le contrôle d'exécution et la planification robotique". Phd thesis, Université Paul Sabatier - Toulouse III, 2006. http://tel.archives-ouvertes.fr/tel-00129505.
Texto completoEspinosa, Gilles-Edouard. "Méthodes de Contrôle Stochastique pour la Gestion Optimale de Portefeuille". Phd thesis, Ecole Polytechnique X, 2010. http://pastel.archives-ouvertes.fr/pastel-00512703.
Texto completoGérard, Karine. "Optimisation automatique des incidences des faisceaux par l'algorithme du simplexe et optimisation des contrôles qualité par la Maîtrise Statistique des Processus (MSP) en Radiothérapie Conformationnelle par Modulation d'Intensité (RCMI)". Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL064N/document.
Texto completoIntensity Modulated Radiation Therapy (IMRT) is currently considered as a technique of choice to increase the local control of the tumour while reducing the dose to surrounding organs at risk. However, its routine clinical implementation is partially held back by the excessive amount of work required to prepare the patient treatment. In order to increase the efficiency of the treatment preparation, two axes of work have been defined. The first axis concerned the automatic optimisation of beam orientations. We integrated the simplex algorithm in the treatment planning system. Starting from the dosimetric objectives set by the user, it can automatically determine the optimal beam orientations that best cover the target volume while sparing organs at risk. In addition to time sparing, the simplex results of three patients with a cancer of the oropharynx, showed that the quality of the plan is also increased compared to a manual beam selection. Indeed, for an equivalent or even a better target coverage, it reduces the dose received by the organs at risk. The second axis of work concerned the optimisation of pre-treatment quality control. We used an industrial method: Statistical Process Control (SPC) to retrospectively analyse the absolute dose quality control results performed using an ionisation chamber at Centre Alexis Vautrin (CAV). This study showed that SPC is an efficient method to reinforce treatment security using control charts. It also showed that our dose delivery process was stable and statistically capable for prostate treatments, which implies that a reduction of the number of controls can be considered for this type of treatment at the CAV
Nabli, Lotfi. "Surveillance préventive conditionnelle prévisionnelle indirecte d'une unité de filature textile : approche par la qualité". Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-158.pdf.
Texto completoLa mdm est comparee a une methode standard comme la methode somme-produit. La fonction detection, basee sur le principe de seuillage permet l'estimation de l'amplitude d'une derive pour le declenchement du processus de pronostic. Une illustration de ce processus est mise en uvre sur la base d'une fonction de prevision basee sur la methode du gradient. Le diagnostic est realise en exploitant les gammes de longueurs d'ondes definis par l'analyse des defauts periodiques. L'ensemble de ce travail a ete concretise par le developpement d'un outil permettant la mise en uvre de cette approche de spcpt. Cet outil est baptise misufit (maquette informatisee de surveillance d'une unite de filature des industries textiles)
Arazo, Alberto. "Sûreté de fonctionnement de systèmes logiciels critiques : validation expérimentale d'un système de contrôle-commande du commerce". Toulouse, INPT, 2002. http://www.theses.fr/2002INPT018H.
Texto completoBoudaoud, Nassim. "Conception d'un système de diagnostic adaptatif en ligne pour la surveillance des systèmes évolutifs". Compiègne, 1997. http://www.theses.fr/1997COMP1060.
Texto completoZhu, Wenjin. "Maintenance of monitored systems with multiple deterioration mechanisms in dynamic environments : application to wind turbines". Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0005/document.
Texto completoThe thesis contributes to stochastic maintenance modeling of single or multi-components deteriorating systems with several failure modes evolving in a dynamic environment. In one hand, the failure process modeling is addressed and in the other hand, the thesis proposes maintenance decision rules taking into account available on-line monitoring information (system state, deterioration level, environmental conditions …) and develops mathematical models to measure the performances of the latter decision rules.In the framework of single component systems, the proposed deterioration and failure models take into account several deterioration causes (chocks and wear) and also the impact of environmental conditions on the deterioration. For multi-components systems, the competing risk models are considered and the dependencies and the impact of the environmental conditions are also studied. The proposed maintenance models are suitable for deterioration models and permit to consider different deterioration causes and to analyze the impact of the monitoring on the performances of the maintenance policies. For each case, the interest and applicability of models are analyzed through the example of wind turbine and wind turbine farm maintenance
Gérard, Karine. "Optimisation automatique des incidences des faisceaux par l'algorithme du simplexe et optimisation des contrôles qualité par la Maîtrise Statistique des Processus (MSP) en Radiothérapie Conformationnelle par Modulation d'Intensité (RCMI)". Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL064N.
Texto completoIntensity Modulated Radiation Therapy (IMRT) is currently considered as a technique of choice to increase the local control of the tumour while reducing the dose to surrounding organs at risk. However, its routine clinical implementation is partially held back by the excessive amount of work required to prepare the patient treatment. In order to increase the efficiency of the treatment preparation, two axes of work have been defined. The first axis concerned the automatic optimisation of beam orientations. We integrated the simplex algorithm in the treatment planning system. Starting from the dosimetric objectives set by the user, it can automatically determine the optimal beam orientations that best cover the target volume while sparing organs at risk. In addition to time sparing, the simplex results of three patients with a cancer of the oropharynx, showed that the quality of the plan is also increased compared to a manual beam selection. Indeed, for an equivalent or even a better target coverage, it reduces the dose received by the organs at risk. The second axis of work concerned the optimisation of pre-treatment quality control. We used an industrial method: Statistical Process Control (SPC) to retrospectively analyse the absolute dose quality control results performed using an ionisation chamber at Centre Alexis Vautrin (CAV). This study showed that SPC is an efficient method to reinforce treatment security using control charts. It also showed that our dose delivery process was stable and statistically capable for prostate treatments, which implies that a reduction of the number of controls can be considered for this type of treatment at the CAV
Tamani, Karim. "Développement d'une méthodologie de pilotage intelligent par régulation de flux adaptée aux systèmes de production". Chambéry, 2008. http://www.theses.fr/2008CHAMS012.
Texto completoThis thesis deals with development of an intelligent flow control approach applied to the field of high-volume production systems. In this context, the flow of parts is approximated by a continuous-flow (fluid) model. Thus, based on the obtained model, the proposed methodology aims at improving the performance of the overall system in presence of disturbances. In this context, based on the decomposition of a production system into basic modules, a two-level control architecture is proposed : a local control level for regulating the material flows at each basic production module on the basis of local information (surplus and buffer levels). A supervisory control level for coordinating the lower level distributed controllers and tracking the global objectives. Firstly, at the local control level, the surplus-based approach is adopted to regulate the flow into each production module. The control policy allocates the needed capacity by adjusting the processing rates in order to satisfy the demand and eliminate machine starvation or blocking. In this case, the local control structure is distributed. Due to the limitation of the existing analytical surplus-based approaches and the presence of uncertainties, the local controller is designed on the basis of expert knowledge according to the Takagi-Sugeno fuzzy formalisms. Next, the supervision level is introduced in order to enhance the reactivity of the local control and improve the overall production-system performances by integrating the global objectives through a decisional mechanism able to deal with conflicting situations. The supervisory control action is deployed as an additive component when a degraded operating mode is detected. In this context, the function of the supervisor is formalized by using aggregation mechanisms based on the fuzzy rules and the aggregation operators. The developed supervisors differ by : the interval representation of the objectives (conventional and fuzzy), the aggregation mechanisms and the aggregated information. Lastly, simulation results through a continuous-flow simulator on some complex production systems of high-volume are presented to illustrate the feasibility of the proposed methodology
Valentin, Nicolas. "Construction d'un capteur logiciel pour le contrôle automatique du procédé de coagulation en traitement d'eau potable". Compiègne, 2000. http://www.theses.fr/2000COMP1314.
Texto completoRachelson, Emmanuel. "Problèmes décisionnels de Markov temporels : formalisation et résolution". Toulouse, ISAE, 2009. http://www.theses.fr/2009ESAE0014.
Texto completoTchoffa, David. "A partir d’une étude ethnométhodologique du "bug de l'an 2000", intégration d’un processus d’amélioration continue de gestion de bugs, incidents, problèmes, changements et configurations pour les systèmes d’information critiques". Paris 8, 2006. http://www.theses.fr/2006PA082736.
Texto completoPrawatya, Yopa Eka. "Multivariate optimisation and statistical process control of polymer triboelectric charging". Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2262/document.
Texto completoThe main objective of the thesis was to study the triboelectric behavior of dry sliding contacts between polymeric materials (ABS, PE, PP, PS and two types of PVC), including the possibility to control and optimize the results in terms of either surface charge generated or wear. A linear tribometer with tribocharging capabilities was designed and built, to enable the study of the sliding contact between solids and to allow the adjustment of main tribocharging control variables: normal force, sliding speed, time and stroke. This device also provided measurement data to characterize the friction condition: the variations of the normal and tangential forces, as well as the relative displacement between the specimens. Furthermore, the electric charge generated and temperature raise due to rubbing on the surface of the polymer were measured, so that to investigate the relationship between the tribological properties. The experiments showed that the level and distribution of the charge generated by dry friction depends on the normal force applied, friction time (cycle), sliding speed, material mechanical properties and surface roughness or texture. Corona discharge may be used to provide initial charge on the surfaces before sliding. Modelling of tribocharging processes was done using the design of experiments methodology. The models can be used to predict and optimize the tribocharging. Control charts were used to monitor the process and detect the special causes of variation in the charge generated by triboelectric effect
Huynh, Khac Tuan. "Quantification de l'apport de l'information de surveillance dans la prise de décision en maintenance". Phd thesis, Université de Technologie de Troyes, 2011. http://tel.archives-ouvertes.fr/tel-00788661.
Texto completoArbelaez, Garces Giovanny Alberto. "Intégration des préférences des parties prenantes et amélioration de l'acceptabilité lors du processus de co-conception : application au système de santé". Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0069/document.
Texto completoDeveloping products that are better accepted by integrating users’ and stakeholders’ preferences is a major challenge for designers and project managers. How to evaluate and improve users’ acceptability has become an important research question. Current approaches leave the acceptability evaluation question for the last stages of New Product Development process (NPD), when a prototype is almost finished and when it is too late to make changes. For this our work is divided in the following contributions: • The test of the co-design approaches through two case studies. • A co-adaptation approach of the habitat for home-healthcare. • An assessment approach of the acceptability level of a solution based on Bayesian networks. • An improvement approach of the assessed acceptability level, enabling the research and simulation of improvement scenarios, combining Bayesian networks and a simulated annealing algorithm
Ibrahim, Dalia. "Étude théorique d'indicateurs d'analyse technique". Thesis, Nice, 2013. http://www.theses.fr/2013NICE4008.
Texto completoThe aim of my thesis is to study mathematically an indicator widely used by the practitioners in the trading market, and designed to detect changes in the volatility term . The Bollinger Bands indicator belongs to the family of methods known as technical analysis which consist in looking t the past price movement in order to predict its future price movements independently of any mathematical model. We study the performance of this indicator in a universe that is governed by a stochastic differential equations (Black-Scholes) such that the volatility changes at an unknown and unobservable random time, for a practitioner seeking to maximize an objective function (for instance, the expected utility of the wealth at a certain maturity). Within the framework of the model, Bollinger indicator can be interpreted as an estimator of the time at which the volatility changes its value. We show that in the case of small volatilities, the density behavior of the indicator depends on the value of the volatility, which allows that for large ratio of volatility, to detect via the distribution estimation in which regime of volatility we are. Also , for the case of large volatilities, we show by an approach via the Laplace transform that the asymptotic tails behavior of the indictor depends on the volatility value. This allows to detect a change for large volatilities. Next, we compare two indicators designed to detect a volatility change: the Bollinger bands and the quadratic variation indicators. Finally, we study the optimal portfolio allocation which is described by a non-standard stochastic problem in view of that the admissible controls need to be adapted to the filtration generated by the prices. We resolve this control problem by an approach used by Pham and Jiao to separate the initial allocation problem into an allocation problem after the rupture and an problem before the rupture, and each one of these problems is resolved by the dynamic programming method. Also, a verification theorem is proved for this stochastic control problem
Kaiser, Eurika. "Low-dimensional modeling and control of shear flows using cluster analysis". Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2295.
Texto completoA cluster-based reduced-order modeling strategy is developed for the unsupervised identification of nonlinear flow mechanisms and precursors to desirable or undesirable events. The proposed approach assumes a probabilistic viewpoint taking advantage of the linearity of the evolution equation for the probability while including nonlinear actuation dynamics.The framework is applied to the Lorenz attractor, numerical data of the spatially evolving mixing layer, the three-dimensional turbulent wake of a bluf body, of a train, and experimental data of a combustion engine.For these examples, CROM has been shown to identify quasi-attractors such as the two shedding regimes of the mixing layer or the bimodal states of the Ahmed body; main transition processes between those quasiattractors are characterized by branching regions or flipper cluster; desirable phase space regions and possible actuation mechanisms areindicated by analysis of cluster features like drag and lift forces which can be further exploited for control purposes.In particular, a CROM-based feedback control is applied to a separating flow over a smooth ramp to examine whether the recirculation area can be diminished compared to the best open-loop periodic excitation by turning the actuation on or of depending on the applicable cluster. The CROMbased control is compared to the complete set of control laws defined byall possible combinations of 'on' and 'of' for the given set of clusters.While the recirculation area cannot be further decreased compared to the best open-loop forcing, a similar size can be achieved for 28% (CROMbased control) or 81% (one particular control law) savings in the control input energy
Bringer, Yves. "Performances de nouvelles architectures machines pour la mise en oeuvre d'algorithmes de traitement et d'analyse d'image". Saint-Etienne, 1993. http://www.theses.fr/1993STET4024.
Texto completoBignon, Alain. "Génération conjointe de commandes et d'interfaces de supervision pour systèmes sociotechniques reconfigurables". Phd thesis, Université de Bretagne Sud, 2012. http://tel.archives-ouvertes.fr/tel-00735869.
Texto completoBonelli, Maxime. "Modélisation stochastique des marchés financiers et optimisation de portefeuille". Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4050/document.
Texto completoThis PhD thesis presents three independent contributions. The first part is concentrated on the modeling of the conditional mean of stock market returns: the expected market return. The latter is often modeled as an AR(1) process. However, empirical studies have found that during bad times return predictability is higher. Given that the AR(1) model excludes by construction this property, we propose to use instead a CIR model. The implications of this specification are studied within a flexible Bayesian state-space model. The second part is dedicated to the modeling of stocks volatility and trading volume. The empirical relationship between these two quantities has been justified by the Mixture of Distribution Hypothesis (MDH). However, this framework notably fails to capture the obvious persistence in stock variance, unlike GARCH specifications. We propose a two-factor model of volatility combining both approaches, in order to disentangle short-run from long-run volatility variations. The model reveals several important regularities on the volume-volatility relationship. The third part of the thesis is concerned with the analysis of optimal investment strategies under the drawdown constraint. The finite horizon expectation maximization problem is studied for different types of utility functions. We compute the optimal investments strategies, by solving numerically the Hamilton–Jacobi–Bellman equation, that characterizes the dynamic programming principle related to the stochastic control problem. Based on a large panel of numerical experiments, we analyze the divergences of optimal allocation programs