Дисертації з теми "Identification des phénomènes d'écoulement"
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Wang, Lianfa. "Improving the confidence of CFD results by deep learning." Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLM008.
Повний текст джерелаComputational Fluid Dynamics (CFD) has become an indispensable tool for studying complex flow phenomena in both research and industry over the years. The accuracy of CFD simulations depends on various parameters – geometry, mesh, schemes, solvers, etc. – as well as phenomenological knowledge that only an expert CFD engineer can configure and optimize. The objective of this thesis is to propose an AI assistant to help users, whether they are experts or not, to better choose simulation options and ensure the reliability of results for a target flow phenomenon. In this context, deep learning algorithms are explored to identify the characteristics of flows computed on structured and unstructured meshes of complex geometries. Initially, convolutional neural networks (CNNs), known for their ability to extract patterns from im-ages, are used to identify flow phenomena such as vortices and thermal stratification on structured 2D meshes. Although the results obtained on structured meshes are satisfactory, CNNs can only be applied to structured meshes. To overcome this limitation, a graph-based neural network (GNN) framework is proposed. This framework uses the U-Net architecture and a hierarchy of successively refined graphs through the implementation of a multigrid method (AMG) inspired by the one used in the Code_Saturne CFD code. Subsequently, an in-depth study of kernel functions was conducted according to identification accuracy and training efficiency criteria to better filter the different phenomena on unstructured meshes. After comparing available kernel functions in the literature, a new kernel function based on the Gaussian mixture model was proposed. This function is better suited to identifying flow phenomena on unstructured meshes. The superiority of the proposed architecture and kernel function is demonstrated by several numerical experiments identifying 2D vortices and its adaptability to identifying the characteristics of a 3D flow
Dijoux, Loïc. "Simulation numérique des phénomènes d'écoulement et de transport de masse en milieu poreux." Thesis, La Réunion, 2019. http://www.theses.fr/2019LARE0033.
Повний текст джерелаFlow and mass transport through porous media are an important part of underground water studies. Pollution spreading or salt water intrusion in coastal groundwater tables are well known applications. This thesis manuscript is dedicated to the study of this physical phenomena through numerical modelling. Different finite element methods are presented and discussed. We focus on the mathematical representation of strongheterogeneous and anisotropic porous media. We introduce two new numerical methods named H-RTm and H-RTp methods. They take advantage of the hybridization technique applied to mixed finite element methods and discontinuous Galerkin finite element methods. The benefits reached in the numerical representation of flow and mass transfer in porous media are illustrated through numerical examples currently used in literature
Bon, Christophe. "Relation pression-vitesse d'une classe d'écoulement instationnaire : application à la mesure des débits instantanés." Poitiers, 1996. http://www.theses.fr/1996POIT2256.
Повний текст джерелаCouture, Caroline. "Typologie des patrons d'écoulement et identification des zones sensibles en forêt." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0006/MQ43805.pdf.
Повний текст джерелаRanaïvoson, Daudet. "Dosage de granulats : Etude des phénomènes d'écoulement et de voute. Application à la conception des trémies doseuses." Nantes, 1990. http://www.theses.fr/1990NANT2039.
Повний текст джерелаBoughenou, Mourad. "Contribution à la compréhension des phénomènes de transfert de solutés en nanofiltration : caractérisation des membranes et application aux composés toxiques." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT015G.
Повний текст джерелаBenaziz, Marouane. "Identification et modélisation de phénomènes vibratoires non-linéaires dans les amortisseurs." Thesis, Ecully, Ecole centrale de Lyon, 2013. http://www.theses.fr/2013ECDL0058/document.
Повний текст джерелаHigh-frequency vibratory phenomena in shock absorbers are not suitable for the car sound quality. Forces (in the frequency range [200-800] Hz) transmitted from the shock absorber to the car body are responsible for the so-called "rattling noise". This structure-borne noise is starting from the shock absorber when the car drives over a rough road and is transmitted to the car body by structural transfer path. In order to understand and predict the phenomena, physical mechanisms generating high-frequency vibrations and peaks in the shock absorber response must be identified. These mechanisms are closely related to oil behaviour, internal mechanical components and interactions between all these elements. The present work consists on the one hand in modelling the shock absorber taking into account valve dynamics, valve stiction, friction and loss of pressure relations in the orifices. On the other hand, experimental shock absorber testing was conducted in order to build the model and to validate it. Model simulations reproduce observed phenomena in the experiments and helped us to identify the mechanisms leading to structure-borne noise, like spring valve opening and check-valve stiction. Sensitivity of the model response due to its input parameters was evaluated with Morris method. Moreover, some guidances are given in order to reduce the level of structure-borne noise generated by the shock absorber
Odaymet, Ahmad. "Etude du transfert thermique local et identification des structures d'écoulement lors de la condensation dans un microcanal en silicium." Phd thesis, Université de Technologie de Belfort-Montbeliard, 2010. http://tel.archives-ouvertes.fr/tel-00711985.
Повний текст джерелаLissy, Anne-Sophie. "Imagerie quatitative non invasive et expérimentation pour l'intégration des phénomènes d'écoulement non uniforme dans les modèles de transfert de masse en milieux poreux hétérogènes : Application aux sols structurés." Thesis, Avignon, 2019. http://www.theses.fr/2019AVIG0709.
Повний текст джерелаPredicting the evolution of groundwater resource due to future climate change requires a better knowledge of water flows in soils which are highly complex porous medium. A lot of research has been conducted about soil water flow complexity over the last decades but predicting water flow in soils whatever soil texture, soil structure and rainfall intensities still remains a challenge. The objective of this work is to improve the modeling of water flow in structured soils by accounting to water flow from macropores to the soil matrix. We follow three successive steps : (i) to perform infiltration – drainage experiments on decimetric undisturbed soils columns under a medical tomograph to better observe flow phenomena within the soil macroporosity, (ii) to extract structural indicators from tomographic images, and study the macroporous soil structure, and (iii) to integrate structural indicators into a Darcy-Richards – KDW dual compartment flow model. Undisturbed soils studied are sampled from three different plots: (i) a clay soil worked in a field crop, (ii) a clay soil not worked in an orchard and (iii) a silt – sandy soil not worked and not cultivated. Three infiltration – drainage experiment are performed in a medical tomograph with fast image acquisition (~15 sec), 30 mm of water is supplied with a rainfall simulator and an intensity of 20 mm.h-1. Infiltration duration was of 90 min followed by 30 min of drainage. In total, the tomographic follow-up takes 120 min. Each experiment is done at three initial moisture conditions: (1) field capacity, (2) matrix potential at – 4 m, and (3) matrix potential at – 8 m. The initial structure observed before each infiltration shows that the soil macroporosity increases from 2 to 5% with the decrease of the initial water content. This increase is higher for the two clay soils compared to the silty – sandy soil. The hypothesis is that soil texture influences the evolution of the soil structure according to the matric water content. Thus, clay soils have the most variable soil structure over time, unlike silt – sandy soils which seem more structurally stable. Rapid movements of the soil structure during the infiltration and drainage phases was observed thanks to the time lapse tomographic monitoring. During water flow, soil macroporosity decreases between 7 to 30 % and increases again during drainage. The decrease of soil macroporosity during infiltration is more pronounced for the most saturated initial condition. The increase is less marked for the driest conditions. The hypothesis is that water flow along the macropores’ walls destabilizes causes an ‘over-swelling’ of the walls, which reverses during drainage. The study of overall indicators show that temporal monitoring of macropores density and their volumes makes it possible to discriminate specific texture and tillage behaviors different for the three soils. Models performed with the addition of profiled data measured on tomographic image in water flow model show that these measurements allow to reconstruct experimental data. Although the gap between modelling and observation for the driest experiments seems to indicate that it is necessary to continue the study of macropores – matrix exchanges in unsaturated conditions. This requires further study of the movements of the structure during wetting – drying cycles but also during the fast water flux transit
Vicente, Jérôme (1970. "Caractérisation de phénomènes dynamiques complexes par traitement d'images : application à la reconnaissance des fumées." Aix-Marseille 1, 1999. http://www.theses.fr/1999AIX11054.
Повний текст джерелаLebegue, Julie. "Aération et dynamique de colmatage en bioréacteur à membranes immergées : identification de grandeurs et phénomènes déterminants." Montpellier 2, 2008. http://www.theses.fr/2008MON20097.
Повний текст джерелаMembrane bioréactor, coupling bioreactions and porous membrane separation in a same unit, allows working with high biomass concentrations what improves bioreaction rates but penalizes the separation step. Integrated in a European Program (EUROMBRA), this work had as objective to study the influence of hydrodynamics induced by aeration on the membrane fouling dynamic. According to precedent works of the laboratory and the analyses of references, the objective was axed on the phenomenon analysis at three observation scales: irreversible biomass accumulation throughout the membrane bundle, analysis of the biofilm present on the membrane surface, importance of adsorbed molecules into membrane pores. Specific methodologies were carried out, lab scale pilots and analytical methods, notably for biofilm observations and identification of irreversible compounds fixed onto/into membrane (this part was developed in collaboration with the University of Technology of Sydney). Results show the importance of determining criteria (i) on the biological step such as solid retention time and organic load rate which determine concentrations of biomass and soluble microbial product in biological suspension and influence directly reaction rates but also membrane fouling dynamics and (ii) on the separation step, the role of aeration to control sludging and biofilm importance, wheras adsorption into the pores was not depending on aeration. Future researches can then be focused on identification of SMP in relation with biological conditions and their influence on biofilm structure and properties
Hadj-Amar, Hassiba. "Identification de lignes de courant principales d'un écoulement de fluide par assimilation de données." Paris, CNAM, 2003. http://www.theses.fr/2003CNAM0476.
Повний текст джерелаWe present an original method which combines data assimilation and optimal shape design to identify principal streamlines of a fluid flow around a profile, particularly, the boundary streamline between the irrotational incompressible flow and the rotational wake. We can take observations in the area where the flow is irrotational incompressible. We consider a potential flow model. To solve the flow equations, we use an integral equations method. It allows us to solve integral equations on the boundary of a domain instead of solving an exterior problem in a domain. Using the integral equations also allows us to get a boundary mesh in the place of a surface mesh, so we avoid remeshing problem that we have with finite element methods. We minimize a quadratic gap between the observations field and the numerical values obtained by the model. The minimization parameter is the streamline we want to identify. We did the some applications with data simulated by a Navier-Stokes code. The Navier-Stokes solution is the nearest solution to a real flow
Chenegrin, Kévin. "Identification et modélisation des phénomènes thermomécaniques mis en jeu lors du perçage à sec de l’Inconel 718." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSEE002.
Повний текст джерелаIn the current industrial context, aerospace players seek to achieve a high level of performance for the mechanical resistance of critical components, while reducing production costs. This industry was one of the first to consider the control of manufacturing processes as a privileged axis of its research, since the consequences of in-service fatigue failure can be economically and humanly disastrous. Among the various existing processes, machining still represents a large part of the manufactured critical components obtained by roughing and finishing operations. Drilling remains the most common machining operation used in industry, but also one of the least studied due to the machined geometrical shape. Indeed, the creation of cylindrical holes prevents direct observation of the cutting mechanisms, making it difficult to study the thermomechanical phenomena involved in the drilled hole. In an industrial environment, dry drilling operation is very detrimental to the tool and the material because it results in a significant lack of lubrication, caused by a machining hazard. In this configuration, heat transfers play a crucial role in the generation of residual stresses. The development of an original experimental and numerical strategy made it possible to identify and modeling the thermomechanical phenomena involved in dry drilling of Inconel 718. Thus, residual stresses induced in the hole could be modeled and compared to XRD analyses
Thevenot, Mael. "Contact à grande vitesse en zone labyrinthe, identification des phénomènes mécaniques et thermiques et du comportement des matériaux." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0010.
Повний текст джерелаImproving the control over sealing of secondary air systems of aircraft engines require a minimum gap clearance between rotating parts and the surrounding casing, which guarantees higher engine efficiency. The tight clearance allows to reduce leakage flows but may leads to undesirable interactions between the static and rotating parts. Labyrinth seals are dynamic sealing systems for which an abradable coating is deposited on the stationary part of the seal to limit the damage of the rotating shaft. Depending on contact conditions, labyrinth-abradable interactions are potentially critical for the seal. This study aims to identify experimentally the material behaviour during these contact conditions. A high-speed contact test rig was developed to recreate contact conditions occurring in an aircraft engine. Two contact configurations involved in different locations of the engine were explored, with three thermally sprayed coatings and three honeycomb coatings, presenting different materials and surface areas. Thermomechanical characterisation is achieved with a specific instrumentation designed for the study. A tribological analysis based on the third body concept is coupled to the experimental analysis. This approach allows to identify wear mechanisms and material flows through the contact (tribological circuit), which determine the thermomechanical constraints in the high-speed contact. This work was achieved within the framework of cooperation between Safran Tech Saclay (SAFRAN group), Safran Aircraft Engines Villaroche (SAFRAN group) and the Laboratoire Génie de Production (LGP) de Tarbes
Fleuchot, Betty. "Les régulateurs transcriptionnels Rgg. Confirmation de leur implication dans des phénomènes de quorum-sensing et identification de leurs cibles." Phd thesis, AgroParisTech, 2011. http://pastel.archives-ouvertes.fr/pastel-00782705.
Повний текст джерелаGaillard, Bernard. "Identification des phénomènes de relaxation d'ions 3d dans ZnS cubique, V2O5 cristallin et amorphe : détermination des propriétés électroniques et vibratoires locales." Aix-Marseille 1, 1987. http://www.theses.fr/1987AIX11125.
Повний текст джерелаLintis, Laura. "Étude des phénomènes de sorption de l’eau sur des aérosols solides émis lors d’un incendie : identification des paramètres physico-chimiques d’influence." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0304/document.
Повний текст джерелаDuring a fire in a nuclear plan, the high efficiency particle air (HEPA) filters are clogged by a deposit (or “cake”) of soot, the latter corresponding to carbonaceous nanoparticles aggregates. The effect of humidity, observed on the filters by the presence of condensed water, is still not considered in the clogging models developed in scientific community. In this context, the aim of this study consists on a better understanding of the water sorption on the soot. The experimental approach was first the production of “analytical” soot with different isolated fuels and at different dioxygen concentrations, and of “fire” soot at large scale with different ventilations and complex elements (glove boxes, electrical cables, hydraulic oil). The physicochemical properties (morphology, porosity, specific surface area, elemental and chemical composition) and the water sorption isotherms, for samples at compacted pellet and powder state, have been determined. The parameters from the model of Dubinin-Serpinski, obtained for a first class of hydrophobic soot, enabled to propose a relevant model, characteristic of the analytical soot. Furthermore, water sorption isotherms on soot cake, coming from realistic fires and fuels, have been modeled with the D’Arcy and Watt (DW) equation. For this second class of hydrophilic soot, the DW parameters appear relatively more dispersed. This relative dispersion is due to the different properties of the fire soot and especially to the presence of high amounts of oxygen and halogens (chlorine, phosphor). This study enabled to highlight a more significant water adsorption on fire soot, leading to the capillary condensation, which is favored for soot compacted into pellet. Soot chemical a and elemental composition appeared to be the most influencing parameter on water sorption phenomenon
Lintis, Laura. "Étude des phénomènes de sorption de l’eau sur des aérosols solides émis lors d’un incendie : identification des paramètres physico-chimiques d’influence." Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0304.
Повний текст джерелаDuring a fire in a nuclear plan, the high efficiency particle air (HEPA) filters are clogged by a deposit (or “cake”) of soot, the latter corresponding to carbonaceous nanoparticles aggregates. The effect of humidity, observed on the filters by the presence of condensed water, is still not considered in the clogging models developed in scientific community. In this context, the aim of this study consists on a better understanding of the water sorption on the soot. The experimental approach was first the production of “analytical” soot with different isolated fuels and at different dioxygen concentrations, and of “fire” soot at large scale with different ventilations and complex elements (glove boxes, electrical cables, hydraulic oil). The physicochemical properties (morphology, porosity, specific surface area, elemental and chemical composition) and the water sorption isotherms, for samples at compacted pellet and powder state, have been determined. The parameters from the model of Dubinin-Serpinski, obtained for a first class of hydrophobic soot, enabled to propose a relevant model, characteristic of the analytical soot. Furthermore, water sorption isotherms on soot cake, coming from realistic fires and fuels, have been modeled with the D’Arcy and Watt (DW) equation. For this second class of hydrophilic soot, the DW parameters appear relatively more dispersed. This relative dispersion is due to the different properties of the fire soot and especially to the presence of high amounts of oxygen and halogens (chlorine, phosphor). This study enabled to highlight a more significant water adsorption on fire soot, leading to the capillary condensation, which is favored for soot compacted into pellet. Soot chemical a and elemental composition appeared to be the most influencing parameter on water sorption phenomenon
Bernard, Benjamin. "Etude des dépôts d'avalanches de débris volcaniques : analyse sédimentologiques d'exemples naturels et identification des mécanismes de mise en place." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2008. http://tel.archives-ouvertes.fr/tel-00422614.
Повний текст джерелаSikorav, Jacques. "Sur l'identification et la modélisation de phénomènes non-stationnaires en acoustique : Equation des ondes dans les ouverts non-cylindriques." Paris 9, 1988. http://www.theses.fr/1988PA090029.
Повний текст джерелаBertrand, Nicolas. "Caractérisation électrique, mise en évidence des phénomènes physico-chimiques et modélisation fractionnaire des supercondensateurs à électrodes à base de carbone activé." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14251/document.
Повний текст джерелаThis work aim is an efficient modelling proposal for supercapacitors made of activated carbon electrodes which are power components used in many energy storage applications. In the first part of this study, the purpose is to evidence physico-chemical phenomena, electrostatic or electrochemical as well, thanks to characterization and aging tests. The results analysis combined with materials knowledge leads to suppose that the supercapacitor non linear behavior is due to adsorption-desorption processes and also to anomalous diffusion of adsorbed species into the electrode microporous network. These mechanisms in addition with the double layer capacitor principle allow us to define a non linear fractional model with parameters that depend on physic0-chemical characteristics of the cell. The proposed identification procedure is based on the voltage response to charges-discharge current profiles. In spite of the simplicity of this identification method, the model matches very well the behavior of the supercapacitor under current profiles that are typical of hybrid and electric vehicle applications
Domps, Baptiste. "Identification et détection de phénomènes transitoires contenus dans des mesures radar à faible rapport signal à bruit : Applications conjointes aux problématiques océanographique et atmosphérique." Electronic Thesis or Diss., Toulon, 2021. http://www.theses.fr/2021TOUL0001.
Повний текст джерелаObservations of atmospheric and ocean surface dynamics can be performed via radar remote sensing. The usual approach consists, in both cases, in numerically calculating the Doppler spectrum of the received temporal echoes using a discrete Fourier transform. Although satisfactory for most applications, this method is not suitable for observations of transient phenomena due to being shorter than the integration time required for radar observations. We use an alternative technique based on an autoregressive representation of the radar time series combined with the maximum entropy method. This approach is applied to coastal radar measurements of surface currents in the high frequency band as well as to L-band radar measurements of wind in the lower atmosphere. For both cases, through numerical simulations and case studies, we compare our approach with others that use different instruments. We show that for short integration times, where conventional methods fail, our proposed approach leads to reliable estimates of geophysical quantities (ocean currents and wind speeds)
Courbon, Cédric. "Vers une modélisation physique de la coupe des aciers spéciaux : intégration du comportement métallurgique et des phénomènes tribologiques et thermiques aux interfaces." Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00713527.
Повний текст джерелаMercier, Nathalie. "Identification de sites fonctionnels sur les récepteurs CD36 et CD62P au moyen de peptides de synthèse dérivés de leur séquence : implication dans les phénomènes d'adhésion cellulaire." Lyon 1, 1994. http://www.theses.fr/1994LYO10148.
Повний текст джерелаGirault, Manuel. "Résolution de problèmes inverses en thermique par modèles réduits : applications en conduction non linéaire et en convection forcée." Poitiers, 2003. http://www.theses.fr/2003POIT2257.
Повний текст джерелаThis numerical study deals with the resolution of inverse heat transfer problems using a reduced model of the system. Computing times are therefore hardly reduced in comparison with a detailed model. For linear systems reduction, the Modal Identification Method is used. An original approach is proposed for non linear conduction. Inversion algorithms for detailed and reduced models are proposed for sequential estimation of thermal excitations, using regularisation methods (function specification and penalisation). Works are especially concerned with boundary conditions estimation for unsteady systems, in linear (2D, 3D) and nonlinear (3D) conduction, and also in linear turbulent forced convection (2D, 3D). The estimation of a duct flow velocity profile, through the identification of a shear stress Reynolds number from wall temperatures, is also described
Advedissian, Tamara. "Identification d'une nouvelle fonction de galectine-7 comme modulateur de l'adhérence intercellulaire dans les cellules épithéliales." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC036/document.
Повний текст джерелаGalectins composed a family of soluble lectins implicated in multiple processes. They are characterized by the presence of a carbohydrate recognition domain evolutionary conserved and an affinity for β-galactosides containing sugars. During this thesis, we focused on a protein called galectine-7 whose expression is restricted to stratified epithelia such as the epidermis. Using mouse models with altered expression of galectin-7, our team previously showed that this protein participates in intercellular adhesion and collective cell migration, two key processes in tumour progression and epidermal wound healing. However, the underlying mechanisms remain to be elucidated. Combining different approaches, we discovered that the migration delay observed in the absence of galectin-7 during wound healing could be explained, at least in part, by a reduction of cell coordination and collective cell behaviour of migrating keratinocytes. Moreover, our data showed that galectin-7 directly interact with E-cadherin, a key component of adherent junctions and a major player in collective migration. Surprisingly, this binding did not involve carbohydrate groups. Aiming to precise the role of galectin-7 at adherent junctions, we identified a new function of galectin-7 in the stabilisation of E-cadherin at the plasma membrane. Interestingly, the increased of E-cadherin turnover caused by galectin-7 extinction is also associated to a decreased of the strength of adherent junctions-based intercellular adhesion. Eventually, our experiments indicated that this previously unknown function of galectin-7 required a functional lectin activity, suggesting the involvement of an additional glycosylated actor in this regulation mechanism of E-cadherin dynamics by galectin-7.In conclusion, this thesis allowed to precise the role of galectin-7 in collective cell migration and revealed a novel function of galectin-7 in the regulation of the E-cadherin stability at the plasma membrane. This modulatory effect of galectin-7 on E-cadherin could provide the cell a possible adaptive response to environmental perturbations, as during collective cell migration. Indeed, galectins, because they exhibit rapid redistribution capacities, are good candidates to create adaptive responses
Bertrand, Nicolas. "Caractérisation électrique, mise en évidence des phénomènes physicochimiques et modélisation fractionnaire des supercondensateurs à électrodes à base de carbone activé." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00979094.
Повний текст джерелаBernard, Benjamin. "Etude des dépôts d'avalanches de débris volcaniques : analyse sédimentologique d'exemples naturels et identification des mécanismes de mise en place." Phd thesis, Clermont-Ferrand 2, 2008. http://www.theses.fr/2008CLF21863.
Повний текст джерелаFeissel, Pierre. "Vers une stratégie d'identification en dynamique rapide pour des données incertaines." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2003. http://tel.archives-ouvertes.fr/tel-00132833.
Повний текст джерелаOttonelli, Claudio. "Apprentissage statistique de modèles réduits non-linéaires par approche expérimentale et design de contrôleurs robustes: le cas de la cavité ouverte." Phd thesis, Ecole Polytechnique X, 2014. http://pastel.archives-ouvertes.fr/pastel-01065782.
Повний текст джерелаJuillet, Fabien. "Contrôle d'écoulements dominés par la convection." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-01009463.
Повний текст джерелаHermosilla-Lara, Sébastien. "Amélioration d'une caméra photothermique par traitements d'images adaptés à la détection de fissures débouchantes." Cachan, Ecole normale supérieure, 2002. http://www.theses.fr/2002DENS0042.
Повний текст джерелаNguyen, Hong-Minh. "Une stratégie d'identification robuste pour la localisation et la rupture." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2006. http://tel.archives-ouvertes.fr/tel-00140895.
Повний текст джерелаLes difficultés rencontrées dans ces cas résident dans la non-linéarité et le caractère instable du problème de minimisation sous contraintes non linéaires auquel la formulation nous amène. Une extension de la méthode LATIN aux problèmes mal posés a été proposée et développée afin de permettre la résolution itérative de ce type de problèmes d'optimisation. La résolution de ces derniers fait appel à une méthode de traitement robuste issue du contrôle optimal et basée sur l'équation de Riccati.
Une fois ces difficultés résolues et dans les cas simples unidimensionnels traités pour le moment, la stratégie d'identification proposée s'avère très robuste face aux perturbations des mesures même dans le cas très sévère de la localisation et de la rupture.