Дисертації з теми "Simulation intégrale"
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Salque, Bruno. "Décomposition de domaines pour le calcul de la radiosité en simulation d'éclairage." Nancy 1, 1998. http://www.theses.fr/1998NAN10305.
Machane, Rabha. "Contribution de la méthode intégrale aux frontières au suivi d'interfaces." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10163.
Béreaux, Yves. "Simulation numérique d’écoulements de fluides viscoélastiques à formulation intégrale, par la méthode des tubes de courant." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0005.
Belmonte, Mylène. "Automatisation intégrale de la ligne 1 : étude et modélisation du trafic mixte." Compiègne, 2008. http://www.theses.fr/2008COMP1752.
The current thesis takes place in the framework of fine 1 automation project. It is a project that consists of upgrading fine 1 (with drivers on-board) to unattended train operation (no drivers or agents on-board) without service interruption. It results a mixed fleet operation for a period of two years between manually driven trains and driverless ones. In this context, my research work consists of continuing in a first step the development of software destined to study and analyse the mixed fleet operation on fine 1. Once operational; the model has served as a simulation in two case studies that I elaborate in a second step. These two case studies aim to answer problematical matters affecting the management of the mixed trains running inside the terminal stations. They take into account two opposite constraints: people-staff safety on one hand and quality of service offered to passengers on the other hand. The analysis and the results of these two case studies will be described in the current PhD report
Papaxanthos, Nicolas. "Prédiction par méthode intégrale du bruit d'écoulement à faible nombre de Mach en conduite en présence d'obstacles." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2321/document.
This manuscript deals with the development of a calculation method of low Mach number flow noise in ducts in the presence of fixed obstacles. lt consists of a numerical simulation of the flow during which data are saved and used in a second time to estimate the acoustic radiation. The fluid calculation is performed with an incompressible LES turbulence model. A code has been developed for the acoustic computation which includes the Fourier transform of the flow data, the integral computation and the post-processing. The originality of the method lies in the fact that it requires as information on the flow only surface data. No volume term needs to be saved during the fluid calculation. ln a duct obstructed by an obstacle, the main sources of noise are located near the obstacle and the scattered field on the obstacle dominates on the direct radiation of the sources. lt is the diffraction of the incident radiation which makes the volume data negligible in the acoustic calculation. This is studied and illustrated through the simplified case of the radiation from a source located near a ducted obstacle. Favorable comparisons with measurements validate the method and the developed code. Several configurations are studied: the insertion into a straight rectangular duct of a diaphragm, an arrangement of two diaphragms and a flap. ln the presence of a diaphragm, a theory of similarity is introduced; in the presence of a double diaphragm, interaction phenomena between the two obstacles appear and are analyzed; and in the presence of a flap, particular resonances are examined
Bendjoudi, Aniss. "Contrôle non destructif ultrasonore de tubes métalliques : modélisation, simulation, confrontation à l'expérience et études paramétriques." Paris 7, 2013. http://www.theses.fr/2013PA077002.
Non destructive testings play an essential role in industrial production, in particular in the areas where products quality is critical to safety, such as nuclear. Numerical modeling is one of the means used to understand and master controls. The company CEZUS pursues a project of modeling of its ultrasonic testing for metal tubes used in nuclear fuel assembly. The experimental study of the control is necessary to establish the influence of the various parameters on variability and accuracy. This study also guides the choices made for modeling. To accomplish this, an experimental reproduction of the factory control is realised in the laboratory. Modeling of ultrasonic testing must be sufficiently precise while retaining reasonable computation time. For this, a hybrid model combining a semi-analytical method using the Rayleigh integral with a finite difference method is developed. Finally, the hybrid model is implemented in an operational industrial simulation plaltform. The validation process of simulation results is based on the confrontation with experimental measurements in specific configurations. Signals comparisons show a good qualitative prediction but an incomplete quantitative prediction, especially concerning the relative amplitudes. Finally, the simulation platform allows the exploration of control configurations experimentally incaccessible
Singh, Jitendra. "Couplage de la méthode intégrale aux frontières en formulation non-primitive et d'une méthode multipolaire pour la simulation d'écoulement incompressibles." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0148.
The present work addresses the development of the Soundary Element Method (SEM) to model various types of flow in microfluidics devices. Two tasks were carried out; coupling SEM with multipole methods to decrease computational requirements; and a new direction of employing non-primitive variables (N-PV) in SEM formulations. Axisymmetric flow models were considered since, while allowing the realistic modelling of droplets encountered in our applications, they are less computationally demanding than three-dimensional models. The Multipole Method SEM was developed for axisymmetric potential problems and the computation time was reduced by one third. This method was adapted to the simulation of free surface flow problem of drop impact. A new boundary integral formulation for Stokes flows in axisymmetric and three-dimensional problems is developed in the second part. This formulation constitutes an actual advancement in N-PV SEM based on the Helmholtz decomposition and was validated on standard axisymmetric problems
Leblanc, Alexandre. "Modélisation numérique des résonances par une formulation intégrale - Application au confort acoustique dans une cavité 3D." Phd thesis, Université d'Artois, 2004. http://tel.archives-ouvertes.fr/tel-00261712.
Lim, Tekoing. "Formulation intégrale surfacique des équations de Maxwell pour la simulation de contrôles non destructifs par courant de Foucault. Etude préliminaire à la mise en œuvre de la méthode multipôle rapide." Phd thesis, Ecole Polytechnique X, 2011. http://pastel.archives-ouvertes.fr/pastel-00594405.
Salmon, Stéphanie. "Contribution aux méthodes numériques pour la simulation d'écoulements de fluides, d'électromagnétisme et de physique des plasmas." Habilitation à diriger des recherches, Université Louis Pasteur - Strasbourg I, 2008. http://tel.archives-ouvertes.fr/tel-00340299.
Thierry, Bertrand. "Analyse et Simulations Numériques du Retournement Temporel et de la Diffraction Multiple." Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00651312.
Cancès, Eric. "Simulation moléculaire et effets d'environnement - Une perspective mathématique et numérique." Phd thesis, Ecole des Ponts ParisTech, 1998. http://pastel.archives-ouvertes.fr/pastel-00000101.
Lemaitre, Sophie. "Modélisation des matériaux composites multiphasiques à microstructures complexes : Etude des propriétés effectives par des méthodes d'homogénéisation." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC217/document.
This thesis focuses on setting up of fast, reliable and automated approaches to design representative volume elements (RVE) of composite materials with complex microstructures (matrix/inclusions) and the evaluation of their effective properties via a homogenization process. We developed algorithms and efficient tools for the random generation of such materials. Inclusions shapes may be spherical, cylindrical, elliptical or any combinations of them. Inflation, deflation, dislocation, undulation and coating are also available to generate RVE. The aim is to approach realistic materials subjected to be damaged during production. Particular attention has been focused on the periodic RVE generation.The homogenized characteristics or effective properties of materials formed from such periodic RVE may then be determined according to the principle of periodic homogenization, by an iterative scheme using FFT (Fast Fourier Transform) via the integral Lippmann-Schwinger or by a finite elements method.The stochastic generation of RVE and the set of morphological parameters studied: number of inclusions, type and shape, volume fraction, orientation of the inclusions lead to achieve an average process. Moreover, a special study has been led to take into account the behavior of altered inclusions. Furthermore, we studied two particular cases on the apparent thermal conductivity of the composite, the first for coated spherical inclusions in order to determine the influence of the layer thickness and the second for laminated polymer and carbon fiber composite sewn by a copper wire, in order to determine the influence of the sewing contribution according to the carbon fiber used
Beaudoin, Anthony. "Contribution numérique à l'étude du transport de masse dans les milieux poreux saturés." Le Havre, 2004. http://www.theses.fr/2004LEHA0002.
The aim of the thesis is to solve transport problems by means of particles methods. Two problems are resolved with particles methods : the migration of a solute in the groundwater and the water flow in a porous medium at the pore scale. In order to solve the advection-dispersion equation in the general case of a non-isotropic dispersion, a numerical model based on the particles methods and the dispersion velocity method is presented. In order to simulate flows in porous media at low Reynolds numbers, a numerical model based on an anisotropic particles method and a boundary integral method is presented. The anisotropic particles method allows to improve the description of the boundary layer appearing around grains of the ground. The boundary integral method allows to satisfy the no-slip condition by writing a boundary integral equation on the wall of grains of the ground
Silva, Vargas Karen Zulay. "Mise à l'échelle de la synthèse d'alcool allylique à partir de Glycérol." Thesis, Centrale Lille Institut, 2020. http://www.theses.fr/2020CLIL0024.
Allyl Alcohol is an interesting platform molecule due to its broad range of applications. The Deoxydehydration (DODH) of glycerol seems currently the most competitive method to synthesize allyl alcohol from renewable sources. However, so far, this reaction has been only marginally investigated. The aim of this thesis was to develop an integrated production process of allyl alcohol via DODH of glycerol using a secondary alcohol as solvent-reductant. The catalyst development was carried out using ceria-supported rhenium oxide catalyst. Mesoporous ceria materials were synthetized via a nanocasting process using SiO2 and activated carbon as hard templates, giving excellent yields of up to 86%, using a 2-Hexanol or MIBC as a hydrogen donor and solvent. With respect to the process development, isobaric vapor liquid equilibrium data were determined for main binary systems in order to model the distillation column. The experimental VLE data was successfully fitted using NRTL, UNIQUAC and Wilson thermodynamic model. Finally, the integrated process modelling was carried out based on the experimental results and proposing different scenarios depending on the used solvent. All the proposed strategies allowed to obtain an allyl alcohol purity of 99.99%. In any scenario, the MIBC process proved to be a feasible strategy from a technical point of view, which could potentially be used as starting point for the development of a large scale DODH process
Demangeot, Marine. "L'analyse spatiale des extrêmes à partir d'une unique réalisation : un point de vue géostatistique." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLM032.
Spatial extreme value theory helps model and predict the frequency of extreme events in a spatial context like, for instance, extreme precipitations, extreme temperatures. It is well adapted to time series. However, in some cases, such types of data cannot be accessed: only one or just a few records are made available. This is the case, for instance in soil contamination evaluation. This situation is rarely addressed in the spatial extremes community, contrary to Geostatistics,which typically deals with such issues. The aim of this thesis is to make some connections between both disciplines,in order to better handle the study of spatial extreme events, and especially their spatial dependence structure, when having only one set of spatial observations. A link is first established through the concept of integral range. It is a geostatistical parameter that characterizes the statistical fluctuations of a stationary random field at large scale. When the latter is max-stable, we show that its extremal coefficient function (ECF), which is a measure of spatial dependence, is closely related to the integral range of the corresponding exceedance field above a threshold. From this, we move toproposing a new nonparametric estimator of the ECF. Its asymptotic properties are derived when it is computed from a single and partially observed realization of a stationary max-stable random field. Specifically, under some assumptions on the aforementioned integral range, we prove that it is consistent and asymptotically normal. Finally, we develop a novel algorithm to perform exact simulations in a continuous domain of storm processes with deterministic shape function. It distinguishes itself from most existing procedures, which apply to simulation domains made of a finite number of points. Most part of the algorithm are designed to be parallelizable
Vasconcelos, Joao. "Optimisation de forme des structures électromagnétiques." Phd thesis, Ecole Centrale de Lyon, 1994. http://tel.archives-ouvertes.fr/tel-00139127.
Riah, Zouheir. "Plate-forme SCILAB de simulation intégrée circuits/composants." Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/95062504-1428-4e70-bdca-0d7ef11173b2/blobholder:0/2005LIMO0012.pdf.
This work presents the development of a global simulation platform around Scilab software which integrates a physical model of heterojunction bipolar transistor and the circuit simulation. The first chapter presents the various types of simulation which coexist and which are necessary to design a MMIC circuit, the Scilab platform as well as the RNTL-GASP project. We have developed in the second chapter a toolbox taking into account of all the possible forms of coupling method between physical equations and the circuit environment. We can now calculate the various transistor steady state operations, which can be linear or not in the time and frequency domain. This toolbox is used in the third chapter to analyse and understand physics based noise phenomena in semiconductor devices. In fact, we have used the linear perturbation method to introduce local noise sources inside the device in order to calculate the noise spectral densities at these contacts. Finally, the last chapter shows the interest of this kind of approach to model and simulate physics phenomena. The demonstrators concern two examples which are the Kirk effect and the transient integral charge control
El, Alami Nabil. "Modélisation et simulation des résonateurs RF par équations intégrales de frontière." Cergy-Pontoise, 2008. http://biblioweb.u-cergy.fr/theses/08CERG0362.pdf.
In this thesis we hope to modelize a resonant circuit that is able to be used as an antenna for resonance magnetic imagery (RMI) or as a sensor in material characterization. After Modelling, we make an informatics' software that can simulate electromagnetie fields. In our work, the system studied was defined like follow : a dielectric substrate bounded and recovered by a thin metallic layer was immersed in an electromagnetic fields source. The information that we try to find is: induced current distribution in metallic layer, Joule losses, and the magnetic and electrical field's distribution. The interest of this research work is the time gain in comparison with experimental work, the multitude of models and much electrical and physical information
Bonnaud, Christophe. "Le spectrophe intégral de champs SNIFS : Simulation et analyse des résultats." Phd thesis, Université Claude Bernard - Lyon I, 2005. http://tel.archives-ouvertes.fr/tel-00798731.
To, Quy Dong. "Analyse et simulation des phénomènes de contact conforme et de rupture dans les structures en verre trempé." Université de Marne-la-Vallée, 2007. http://www.theses.fr/2007MARN0379.
Le verre trempé est un matériau dont les caractéristiques mécaniques permettent maintenant la réalisation d’éléments structuraux en génie civil, tels que planchers, poutres ou raidisseurs. Les connexions par boulonnage est une technique très utilisée pour assembler des éléments structuraux en verre. Dans une connexion typique par boulonnage, le trou dans une poutre ou plaque verrière est renforcé par une bague en acier collée à la plaque via une couche mince de résine. La bague est directement en contact avec le boulon en acier, protégeant la plaque en verre contre la concentration de contraintes. Le travail présenté dans cette thèse comporte deux parties. Dans la première partie, une approche analytique est proposée pour résoudre le problème de contact conforme unilateral associé à une connexion par boulonnage. Les champs de déformation et de contraintes dans la couche de résine sont déterminés en exploitant le fait que la rigidité de la résine est largement inférieure à celle du verre et à celle de l’acier. Après avoir trouvé les fonctions de Green pour la bague et pour le boulon, le contact unilateral entre eux est formulé sous forme d’une équation intégrale avec une série de Fourier comme noyau. En négligéant les termes d’ordres supérieurs, cette équation intégrale est transformée en une équation intégrale singulière de Cauchy. Les résultats analytiques pour la pression et l’angle de contact sont finalement comparés et validés avec ceux obtenus par la méthode des éléments finis. La deuxième partie de la thèse est dédiée à l’étude de la trempe du verre et de la rupture des structures en verre trempé avec connexions par boulonnage. Pour déterminer les contraintes résiduelles dans une plaque percée et en verre trempé, le processus de trempe est d’abord modélisé et ensuite numériquement simulé. Les contraintes résiduelles ainsi déterminées sont comparées avec celles de l’analyse photoélastique. Le comportement mécanique de la résine est également modélisé et expérimentalement identifié. Finalement, le processus de rupture d’une plaque en verre trempé avec connexions par boulonnage, qui fait intervenir le contact unilateral, le frottement, l’endommagement et les contraintes résiduelles, est numériquement simulé et expérimentalement étudié. Les résultats obtenus par la méthode des éléments finis sont comparés avec ceux obtenus par des essais en vraie grandeur. Cette thèse contribue au développement de la mécanique du contact et à une meilleur maîtrise du comportement mécanique des structures en verre trempé
Chaillat, Stéphanie. "Méthode multipôle rapide pour les équations intégrales de frontière en élastodynamique 3-D : application à la propagation d’ondes sismiques." Paris Est, 2008. http://pastel.paristech.org/5233/01/these_chaillat.pdf.
Simulating wave propagation in 3D configurations is becoming a very active area of research. The main advantage of the BEM is that only the domain boundaries are discretized. As a result, this method is well suited to dealing with unbounded domains. However, the standard BEM leads to fully-populated matrices, which results in high computational costs in CPU time and memory requirements. The Fast Multipole Method (FMM) has dramatically improved the capabilities of BEMs for many areas of application. In this thesis, the FMM is extended to 3D frequencydomain elastodynamics in homogeneous and piecewise-homogeneous media (using in the latter case a FMM-based BE-BE coupling). Improvements of the present FM-BEM are also presented: preconditioning, reduction of the number of moments, and formulation of a multipole expansion for the half space fundamental solutions. Seismological applications are given for canonical problems and the Grenoble valley case
Kezic, Bernarda. "Analyse statistique et thermodynamique de la micro-structure dans les émulsions moléculaires." Paris 6, 2013. http://www.theses.fr/2013PA066749.
Les mélanges aqueux diffèrent des mélanges des liquides simples, du fait que les molécules d'eau tendent à s'associer préférentiellement entre elles au travers de la liaison hydrogène, de ce fait ségréguant les molécules de soluté sans pour autant entraîner une démixtion macroscopique des mélanges. Même des mélanges aussi simples que l'eau avec le méthanol exhibent ce type d'ordre local. La micro-hétérogénéité (MH) résultante apparait ainsi comme étant distincte des fluctuations de concentration (CF) qui jouent un rôle important dans la stabilité des mélanges. En établissant la correspondance entre les micro-émulsions et ces mélanges que nous appelons « émulsions moléculaires » à partir de la théorie d'Ornstein-Zernike aux petits vecteurs d'onde, nous montrons comment certains problèmes intrinsèques aux simulations peuvent être résolus en recalculant les corrélations à longue portée. De même, l'introduction des fonctions bridges des corps purs extraits des simulations, permet de mieux comprendre le comportement des équations intégrales pour les mélanges, éclairant en particulier la distinction entre CF et MF
Thouviot, Sylvain. "Optimisation multi-critères d'un système mécatronique en intégrant les problèmes vibro-acoustiques." Phd thesis, Ecole Centrale Paris, 2013. http://tel.archives-ouvertes.fr/tel-00879854.
Boudou, Nicolas. "Spectrométrie de Fourier intégrée pour l'astronomie millimétrique." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00955807.
Collard, Fabrice. "Croissance endogène et fluctuations : contribution à une analyse intégrée." Paris 1, 1996. http://www.theses.fr/1996PA010036.
Cycles and growth are considered as two linked phenomenons. But macroeconomics usually studies each of them separately. On the one hand, cycle theorists analyze the data purged from their trend. On the other hand, growth theorists focus on the existence and convergence of a balanced growth path. This leads not to take into account the long run effects of fluctuations on the dynamics of aggregates and not to analyze the effects of growth on the behavior of individuals within the business cycle. The main aim of this dissertation is to analyze these two phenomena in a unified framework. We first propose an econometric analysis of the long run effect of conjonctural disturbances on the dynamics of main oecd economies. We show that the entire set of shocks may alter the long run growth path. We thus find a sufficient condition to the existence of an endogenous growth. We then propose a theoretical framework allowing to study the growth-cycle relation, and then examine the ability of such an integrated approach to palliate the insufficiencies of standard rbc models. We then try to evaluate the normatives implications of this integration. Then, we try to analyze the consequences of growth on unemployment dynamics. Finally, we try to furnish a model that allows to mimic the asymetric behavior of growth cycles
Gloerfelt, Xavier. "Bruit rayonné par un écoulement affleurant une cavité : Simulation aéroacoustique directe et application de méthodes intégrales." Ecully, Ecole centrale de Lyon, 2001. http://bibli.ec-lyon.fr/exl-doc/TH_T1879_xgloerfelt.pdf.
Godoy, Eduardo. "Modélisation mathématique et simulation numérique avancée des phénomènes de propagation d'ondes dans les médias élastiques sans limite." Phd thesis, Ecole Polytechnique X, 2010. http://pastel.archives-ouvertes.fr/pastel-00006252.
Wax, Jean-François. "Détermination de la structure des métaux liquides : comparaison entre théories analytiques, simulation numérique et expérience pour les alcalins." Metz, 1994. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1994/Wax.Jean_Francois.SMZ9444.pdf.
Physics of the structure of liquid metals boasts about a double diversity. Firstly, numerous potentials exist to describe the interactions between particles. Secondly, a large number of approaches have been proposed to deduce the structure from the effective potential. In this work, we study the structure of liquid alkali metals. It is developed around two ideas, attributing a central role to molecular dynamics results. In a first part, the quality of the potential implemented is discussed through a comparison between experimental and simulation results. We used Shaw's model potential and both the Vashishta-Singwi and the Ichimaru-Utsumi local field corrections. It appears that this ab initio potential describes correctly the structure of each alkali metal, including lithium. Molecular dynamic's results seem quite insensitive to the choice of the dielectric function. This confirms the predominant role played by short range forces in determining the structure. The second idea, this study is built on, is an evaluation of different methods available for the description of the structure. By comparison with molecular dynamics, qualities and defaults of both perturbation schemes (ORPA-WCA, ORPA-JA) and integral equations (SMSA) are discussed. In the cases of Na, K, Rb and Cs, these methods produce results near simulation ones. However, the SMSA equation does not show the characteristic drawbacks of perturbation methods. Lithium is particular since any of these analytical methods achieves in matching, even approximately, simulation results. The reasons are not clearly understood. Screening influences S(o) and we underline that its value depends on the way long range interactions are taken into account
Marchina, Philippe. "Simulation de l'interaction sol-structure par la méthode des équations intégrales aux frontières et une loi d'interface." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0019.
David, Gilles. "Modélisation dynamique des modèles physiques et numériques pour la simulation en électromagnétisme. Application dans un environnement de simulation intégrée : salome." Grenoble INPG, 2006. http://www.theses.fr/2006INPG0134.
The aim of this study is to develop software tools facilitating the modelisation of physical phenomena and of their possible couplings. Starting from the example of the resolution of a multiphysic problem (the magneto-thermal coupling in a superconductor rubber), we tackle the question of the modelling steps. More precisely we emphasize the systematic need for the description of the physical properties of the problem. In order to satisfy this need, we propose to use a generic formalism which allows to describe the physical properties of any numerical problem. For that, this formalism allows the description of the structure of the physical properties, in other words their data model. The formalism hence behaves like a model's model : it is a metamodel. Then we present the structure of the metamodel and of the tools and services which were developed along and are used for the management of the data models and of the physical properties. The metamodel was realised in the form of an object-oriented data-processing language : the SPML. This choice is justified and the main characteristics of the SPML language are detailed. Finally we present how we integrated the metamodel into the platform for numerical simulations SALOME and how it was successfully used for the resolution of a simple magnetostatic problem and of a fluid-structure interaction problem
Aumeunier, Marie-Hélène. "Etude d'un spectrographe à champ intégral pour le satellite SNAP [SuperNovae/Acceleration Probe] : prototype, simulation et performances." Aix-Marseille 1, 2007. http://www.theses.fr/2007AIX11068.
The SNAP(SuperNovae/Acceleration Probe) project plans to measure very precisely the cosmological parameters and to determine the nature of dark energy by observations of type Ia supernovae and weak lensing. The SNAP instrument consists in a 2-meter telescope with a one square-degree imager and a spectrograph in the visible and infrared range. A dedicated optimized integral field spectrograph based on an imager slicer technology has been developed. To test and validate the performances, two approaches have been developed: a complete simulation of the complete instrument at the pixel level and the manufacturing and test of a spectrograph prototype operating at room temperature and in cryogenic environment. In this thesis we will test the optical and functional performances of the SNAP spectrograph: especially diffraction losses, straylight and spectro-photometric calibration. We present an original approach for the spectro-photometric calibration adapted for the slicer and the optical performances resulting from the first measurement campaign in the visible range
Rey-Coyrehourcq, Sébastien. "Une plateforme intégrée pour la construction et l'évaluation de modèles de simulation en géographie." Thesis, Paris 1, 2015. http://www.theses.fr/2015PA010690.
Since 1990’s, Agent Based Modelling are commonly used by geographers to study complex systems like cities. However, very few technical platforms are advanced by searchers to assist in the construction of an expert interdisciplinary team, we try to solve these problematic following thwo objectives. Relying on the support of OpenMOLE platform developed at the Institute of Complex System Paris-Ile-de-France in order to make it simple the distribution of simulation on distributed computing environments, we identify, use or build new tools and methodology to construct and explore model of simulation. To anchor this work in practice, we use this platform to build and explore a new model of simulation : SimpopLocal. This very practical work is accompanied by an historical and epistemological reading of simulation, and the means of simulation in geography. These contextualisation permits us to examine, and perhaps to anticipate, the historical link between the old problematic of “Validation”, very important to consider for knowledge justification, and the the building and exploration of models of simulation
Leconte, Vincent. "Simulation des convertisseurs électromécaniques." Phd thesis, Grenoble INPG, 2000. http://tel.archives-ouvertes.fr/tel-00689550.
Martin, Xavier. "Modélisation d'écoulements fluides en milieu encombré d'obstacles." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4759/document.
This document focuses on the modeling of compressible flows in one-dimensional (1D) pipes with variable cross-section, and in two or three-dimensional domains containing many small obstacles. The basic motivation is urged by the modeling of flows in the coolant circuit of pressurised water reactors (PWR). Thus this work aims at providing a new formulation for such a variety of flows. The basic idea consists in using an integral approach that is applied to the governing set of partial differential equations. Here the keystone is the conservative Euler set of equations, including mass, momentum and energy balance for any equation of state.Hence, the first chapter investigates the case of one-dimensional pipes with continuous or discontinuous cross-section. Once the 1D+ integral formulation has been presented, numerical results are compared with : (i) the classical Well-Balanced (WB) approach, and (ii) the reference solution obtained with a multi-dimensional code with huge mesh refinement.The second and third chapters provide some new insight on the numerical modeling of compressible flows in domains obstructed with many tubes. The integral formulation is derived, and numerical schemes are detailed, in order to handle fluid/fluid interfaces and wall boundaries. Schemes may be explicit (chapter 2), or implicit (chapter 3). A few analytic test cases are investigated. Focus is made on the flow incoming a region containing many tiny and aligned tubes. Here again, a comparison with the reference "fluid" solution is achieved; results are also compared with those arising from the WB approach, and with those coming from the 1D+ integral approach proposed in the first chapter
Vigneron, Audrey. "Formulations par équations intégrales de surface pour la simulation numérique du contrôle non destructif par courants de Foucault." Palaiseau, Ecole polytechnique, 2015. https://tel.archives-ouvertes.fr/tel-01114368/document.
The thesis addresses the numerical simulation of non-destructive testing (NDT) using eddy currents, and more precisely the computation of induced electromagnetic fields by a transmitter sensor in a healthy part. This calculation is the first step of the modeling of a complete control process in the CIVA software platform developed at CEA LIST. Currently, models integrated in CIVA are restricted to canonical (modal computation) or axially-symmetric geometries. The need for more diverse and complex configurations requires the introduction of new numerical modeling tools. In practice the sensor may be composed of elements with different shapes and physical properties. The inspected parts are conductive and may contain dielectric or magnetic elements. Due to the cohabitation of different materials in one configuration, different regimes (static, quasi-static or dynamic) may coexist. Under the assumption of linear, isotropic and piecewise homogeneous material properties, the surface integral equation (SIE) approach allows to reduce a volume-based problem to an equivalent surface-based problem. However, the usual SIE formulations for the Maxwell's problem generally suffer from numerical noise in asymptotic situations, and especially at low frequencies. The objective of this study is to determine a version that is stable for a range of physical parameters typical of eddy-current NDT applications. In this context, a block-iterative scheme based on a physical decomposition is proposed for the computation of primary fields. This scheme is accurate and well-conditioned. An asymptotic study of the integral Maxwell's problem at low frequencies is also performed, allowing to establish the eddy-current integral problem as an asymptotic case of the corresponding Maxwell problem
Wanser, Sven. "Simulation des phénomènes de chauffage par induction." Phd thesis, Ecully, Ecole centrale de Lyon, 1995. https://tel.archives-ouvertes.fr/tel-00139980v2.
Every conducting material exposed to an alternating magnetic field generates eddy currents. The material will be heated be Joule's effect. The shape ot the eddy currents depends on the shape of the material and of the inductor, on the frequency and the and the amplitude of the magnetic field, and also on the physical properties of the materials. The induction heating is a technology which is very well adapted to thermic treatments in metallurgy. But it is necessary to use an inductor with the right dimensions to obtain an optimal result. As there are many parameters to take in account, it seems to be usefull to work with numerical support. In this work, after describing the physical and mathematical bases,the numerical methods adapted to magnetodynamic and thermal problems, we are presenting a method for a magneto-thermal coupling adapted to induction heating and induction hardening problems. The coupling procedure is based on an boundary element calcul combined with surface impedance method for the magnetic part. The thermal problem is calculated by the volume finite element method. Finally an industrial problem of induction heating is solved in three dimensions using the software packages PHI3D (magnetodynamic, modified) and FLUX-EXPERT (thermic) guided by a supervisor which automates the computation process
Bonnet, Marc. "Quelques contributions aux méthodes d'équations intégrales et à l'étude de problèmes inverses en mécanique des solides." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 1995. http://tel.archives-ouvertes.fr/tel-00121985.
Da, Fonseca Munford-Argollo Daniel. "Outils de conception de circuits RF et micro-ondes intégrant les concepts de méthodologie." Limoges, 2000. http://www.theses.fr/2000LIMO0023.
Qiu, Zhaopeng. "Déplacement d'un mannequin virtuel dans un environnement encombré : simulation de mouvement en intégrant les contraintes d'équilibre." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00836087.
Qiu, Zhaopeng. "Déplacement d'un manequin virtuel dans un environnement encombré : simulation de mouvement en intégrant les contraintes d'équilibre." Paris 6, 2012. http://www.theses.fr/2012PA066537.
This thesis was carried out in collaboration and co-funding of LSI of CEA/LIST and LBMC of IFSTTAR. The aim of the thesis was to study and develop a method for simulating the movement of a virtual manikin (VM) in a cluttered environment based on a priori knowledge. This thesis presents firstly motion capture (MoCap) experiments. The recorded data were analyzed to define some principles on human motion in cluttered environments. We then propose a general balance criterion and stability margin, based on a simplified model of VM. Then, we present a hierarchical framework that can generate and simulate dynamic movements of VM in a cluttered environment in three stages: a global trajectory of the center of mass (CoM) is generated at the global level to ensure balance in the VM's motion; then the trajectories of end-effectors (EE, ie feet, hands) and postures are generated locally under constraints of kinematics and collision avoidance; finally at the execution level, trajectories (CoM and EEs) and postures are used as references in a dynamic controller associated with VM so that the VM realizes the motion in a simulation. This framework is implemented in a car-ingress scenario in order to evaluate its performance and to suggest future improvements
Garnica-Anguas, Paul. "Simulation numérique du frottement entre solides par équations intégrales aux frontières et modèle d'interface non linéaire : application aux pieux." Grenoble 1, 1993. http://www.theses.fr/1993GRE10143.
Bouallaga, Anouar. "Gestion énergétique d’une infrastructure de charge intelligente de véhicules électriques dans un réseau de distribution intégrant des énergies renouvelables." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10043/document.
Energy and environmental crisis have prompted the government to take strong measures to stimulate energy transition and accelerate green growth. In this context, electric vehicles (EVs) are considered as a real solution to deal with the current problems. Their integration into the electrical system promotes distribution system operators to develop smart solutions in this field. Concerning the Smart Grids concept, the present work aims to provide answers to a wide range of questions for demand side management program using plug-in EVs charging strategies. The first section of this PhD project, presents a methodology to assess technical and economic impacts of EVs charging on Medium and Low voltage distribution networks. Afterwards, analyses about the competitive EVs load management ancillary services are conducted in the third chapter. By comparing potential and opportunities of each ones, three ancillary services for electricity market contribution were selected. In this context, a methodology for designing energy management strategies is proposed. The latter is applied to the selected ancillary services to assess the financial contribution of the developed strategies. Environmental aspects and Wind-to-Vehicle concept are also evaluated. Furthermore, thanks to a co-simulation interface, the interactions between supervision strategies and real distribution networks are analyzed. The last section presents a Hardware-in-the-loop demonstrator using a real time simulator, smart meters and EVs charging stations. Through experiments, communication constraints and Smart Grids principles are evaluated and validated
Besse, Patrice. "Tenue en énergie de structures LDMOS avancées de puissance intégrée dans les domaines temporels de la nanoseconde à la milliseconde." Toulouse 3, 2004. http://www.theses.fr/2004TOU30297.
This thesis deals with the electrostatic (ESD) and inductive discharge capability of a LDMOS power transistor, designed under BiCMOS technology. Physical and bidimensional simulations were correlated with failure analyses to validate electrical mechanisms that lead to the transistor destruction. Design guidelines were provided to increase its ESD robustness, considering various gate biasing conditions. These rules do not impact the transistor electrical characteristics during a normal operating mode. A detailed study of ESD protection structures was lead. These structures were associated in parallel with the LDMOS transistor to reach a higher level of robustness. A range of structures has been developed. Their improvement was performed taking into account the surface, the triggering voltage (12V to 60V) and the robustness (> 2. 6V HBM / µm²). These structures can be cleverly used to protect the transistor against inductive discharges. Solutions were described to integrate these structures inside the power transistor. Various patents have been filed and finalize this study
Reboud, Christophe. "Développement d'un modèle électromagnétique 3D pour la simulation d'un procédé de contrôle non destructif." Paris 11, 2006. http://www.theses.fr/2006PA112111.
Eddy current testing (ECT) is widely used in industrial fields such as iron and steel industry. Dedicated simulation tools provide a great assistance for the optimisation of ECT processes. CEA and the Vallourec Research Center have collaborated in order to develop a simulation tool of ECT of tubes. The volume integral method has been chosen for the resolution of Maxwell equation in a stratified medium, in order to get accurate results with a computation time short enough to carry out optimisation or inversion procedures. A fast model has been developed for the simulation of ECT of non magnetic tubes using specific external probes. New flaw geometries have been modelled: holes and notches with flat bottom. Validations of the developments, which have been integrated to the CIVA platform, have been carried out using experimental data recorded in laboratory conditions and in industrial conditions, successively. The integral equations derived are solved using the Galerkin variant of the method of moments with pulse functions as projection functions. In order to overcome some memory limitations, other projection functions have been considered. A new discretisation scheme based on non-uniform B-splines of degree 1 or 2 has been implemented, which constitutes an original contribution to the existing literature. The decrease of the mesh size needed to get a given accuracy on the result may lead to the simulation of more complex ECT configurations
Edeline, Gwenaël. "Méthode énergétique de simulation de propagation de fissure et contraintes résiduelles." Palaiseau, Ecole polytechnique, 2015. http://www.theses.fr/2015EPXX0060.
Antomarchi, Anne-Lise. "Conception et pilotage d'un atelier intégrant la fabrication additive." Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC035/document.
The additive manufacturing is a field on the rise. However, companies wonder about the use of additive manufacturing for mass production. The problem raised in the context of this thesis is: How to make the process of sintering laser melting industrially viable? Our work focuses on the design and on the management of workshops integrating the additive manufacturing and of the complete process to obtain part according to three levels of decision: strategic, tactic and operational. About the strategic level, strong decisions of investment, machines selection and organization choice are taken with important economic issues. The aim is to define a multicriteria optimization method for the modular design of a production system integrating the additive manufacturing in the presence of uncertain data, optimal in the long term and the short term. From a tactical point of view, not all parts are necessarily relevant candidates for additive manufacturing. In this work, we developed a decision support tool that evaluates the relevance or not of additive manufacturing to obtain parts in a global cost approach. At the operational level, we offer a tool based on flow simulation that allows orders to be placed to production orders and their scheduling in order to guarantee the efficiency of the workshop. This research work is developed in collaboration with companies: AddUp, MBDA and Dassault, who contribute to our work and enable us to compare our tools with an industrial reality
Jin, Guanghai. "Nouvelles techniques de modélisation optique : application à quelques composants d'optique intégrée." Lille 1, 1997. http://www.theses.fr/1997LIL10212.
Biancherin, Anthoine. "Simulation aéroacoustique d'un jet chaud subsonique." Paris 6, 2003. http://www.theses.fr/2003PA066361.
Pouchairet-Ramona, Jean-Laurent. "Développement d'un système d'initiation pyrotechnique, sécurisé, autonome, intelligent et intégrant des nanothermites." Thesis, Toulouse, INSA, 2019. http://www.theses.fr/2019ISAT0001/document.
Answering a growing need for standardization and adaptability in pyrotechnics, we hereby present a smart and safe pyrotechnical infrared (IR) flare electronically controllable through an embedded miniature initiation system. The countermeasure has been designed to fit within a 1”×1”×8” standard cartridge, and consists of three distinct blocks, which are mechanically and electronically interconnected: (1) a pyrotechnical ejection block integrating three ejection charges in a single metalized plastic casing, (2) a micro-initiation stage comprising nanothermite-based micro-initiators and a structured pyrotechnic loaf, (3) a STANAG 4187 compatible electronic control, command and power management block.Throughout this work, we developed a lumped parameter internal ballistics model for the ejection, and conducted a response surface methodology study to extract optimal design parameters. We developed a geometric regression script, based on level set techniques, to model the combustion of multicomponent, sequentially-initiated, partially inerted pyrotechnic loafs. We demonstrated, theoretically then experimentally, that we could control the combustion of IR pyrotechnic loaves using sequential initiation, and that we could control the ejection velocity of IR flares using multipoint mortar ejectors.This work resulted in integrating said technological block in a functional 1’’1’’8’’ controllable, autonomous safe and smart infrared flare demonstrator, CASSIS