Дисертації з теми "Modélisation du procédé"
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Fournier, Richard. "Optimisation et modélisation du procédé RTM." Phd thesis, École Nationale Supérieure des Mines de Paris, 2003. http://tel.archives-ouvertes.fr/tel-00266940.
Hatton, Benjamin. "Modélisation d'un procédé de bûcheronnage mécanisé." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22490.
The research work presented here and realized within the framework of the ECOMEF project - which aims to develop a harvester head more specifically designed to process and fell broad-leaved trees – focuses on the modeling of the cut-to-length logging process, and particularly on the felling and processing (delimbing and bucking) operations. Several models have been developed in order to study the transmission of the feed force to the trunk or the delimbing process. In the same time, different benches have been designed in order to carry out experimental tests that allow a better understanding of the considered phenomenons as well as the experimental characterization of the models’ parameters. Finally, a multi-body dynamic simulation has been developed, in order to study the adaptation of different kinematic architectures of articulated frames to the crooked trunks specific to broad-leaved trees. This simulation contains each analytic model and allow a global study of the phenomenon by considering the interaction between each model
Srikunwong, Chainarong. "Modélisation du procédé de soudage par points." Phd thesis, École Nationale Supérieure des Mines de Paris, 2005. http://tel.archives-ouvertes.fr/tel-00151464.
de soudage, la difficulté principale en simulation numérique est la disponibilité de données d'entrée à toutes températures depuis l'ambiante jusqu'au-delà de la fusion. Le couplage des premiers modèles électrothermiques avec des modèles mécaniques permet un bon accord entre expérience et simulation. Une fois qu'un modèle a été validé selon tous les domaines physiques concernés, des résultats comme les cycles thermiques, la taille de soudure ou les contraintes, déformations et état métallurgique résiduels peuvent être utilisés pour mieux comprendre le procédé, pour le piloter ou pour modéliser le comportement des soudures.
Choulak, Samir Eddine. "Modélisation et Commande d'un procédé d'Extrusion Réactive." Phd thesis, Université Claude Bernard - Lyon I, 2004. http://tel.archives-ouvertes.fr/tel-00116677.
La modélisation a été réalisée en adoptant une démarche mixte alliant l'aspect mécanique des milieux continus à celui du génie des procédés. Le schéma d'écoulement intrinsèquement à paramètres distribués, est approché par une cascade de réacteurs parfaitement agités avec reflux. Les caractéristiques de l'écoulement sont issues de la mécanique des fluides. Le modèle global est alors obtenu en écrivant sur chaque RCPA de la cascade les bilans d'énergie sur la matière, les fourreaux et les vis puis les bilans de masse globaux et par espèce.
Cette étape de modélisation a été suivie par une phase d'analyse dans le but de simplifier les phénomènes les moins influents sur l'évolution des variables d'état du procédé (température, pression, viscosité,...) puis par une étape de réduction de modèle.
Enfin, la synthèse de la loi de commande a été effectuée à partir du linéarisé autour d'un point de fonctionnement de ce modèle réduit. La technique de commande utilisée a été la synthèse Hinf, avec modèle de référence sur la trajectoire en viscosité. Cette synthèse a abouti à une loi de commande satisfaisante fonctionnant à la fois sur le modèle linéarisé mais aussi sur le modèle complet non linéaire au voisinage du domaine de fonctionnement.
Mondalek, Pamela. "Modélisation numérique du procédé de frittage flash." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00820191.
Pérot, Estelle. "Optimisation et modélisation du procédé de rotomoulage." Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0060/these.pdf.
Rotational Molding is the best method for producing large hollow plastic articles without weld lines. But it is a quite complex and empirical process. Constant quality in technical parts requires the mastery of the process by controlling on line the main physical phenomena. One of these of first importance is heat transfers. During the processing time, polymer powder melts, then the phenomena of particle coalescence and melt densification occur. After cooling, the molded part is obtained. The understanding of sintering phenomenon, linked to polymer structure, may explain surface defects and bubbles in rotationally molded parts. That’s why this project has been carried out. It is divided into two parts: the first part deals with the relationship between the material structure, the process and the final properties; the second part deals with the modelling of heat transfers during the process. Firstly, material properties such as polymer structure, rheological parameters and surface tension were studied and linked to sintering kinetics. Secondly, samples were molded with a pilot-scale rotational molding machine. This work enabled us to model the sintering phenomenon and to bind its kinetics with polymer structure, rheological properties and final parts properties. An experimental analysis of heat transfer in rotational molding process was also lead by using an instrumented mold associated with an original radio transmission data acquisition system. Moreover, a thermal model was developped by using a static heated plate in order to validate the numerical results. This modelling took into account the sintering phenomenon
Barry, Ugo. "Comportement du procédé R3F en nitrification : suivi, modélisation dynamique et limites du procédé." Phd thesis, AgroParisTech, 2013. http://pastel.archives-ouvertes.fr/pastel-00925421.
Vonner, Alexandre. "Étude et modélisation d'un procédé catalytique hétérogène d'estérification." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0175.
This study aims at analyzing and understanding the processes involved in the production of 2-ethylhexyl acrylate. This fatty ester is a derivative of acrylic acid. This reaction is accelerated by the use of a solid catalyst, a sulfonated resin acid. The specific interactions of compounds with this resin were studied at room temperature. At 90°C, the coupling of kinetics and selective affinity was analyzed and modeled in a closed reactor. A specific pilot installation was designed in laboratory. Esterification reactions were performed. in this fixed bed reactor. The tripartite structure allows the monitoring of liquid levels in all installation. A model representing this system was developed, involving selective affinity, kinetics and hydrodynamic. This model was then used to analyze trends models to determine improved operating conditions for an industrial size process
Chiheb, Azzedine. "Modélisation des transferts thermiques dans le procédé d'appertisation." Paris 12, 1993. http://www.theses.fr/1993PA120015.
Nguyen, Huu-Thuan. "Contribution à la modélisation du procédé de rotomoulage." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10043.
This Ph.D research work is about the study of polymer flow and heat transfer in both processes of rotational molding: reactive rotational molding and rotational molding of thermoplastic powders. The flow of the reactive polymer in the reactive rotational molding was modeled by a free surface flow under gravity inside a horizontal rotating cylinder. The meshless and lagrangian method ''Smoothed Particle Hydrodynamics (SPH)'' was applied to simulate the flow by using an adapted variable viscosity expression. In powder state, the flow and heat transfer of polymer during rotational molding of thermoplastic powders are modeled using a solver based on the ''Discrete Element Method (DEM)''. In which, the flow regime, the segregation, the mixture and the heat transfer of polymer powders inside a horizontal rotating cylinder was simulated. Results of the model have been validated experimentally with success
Halloumi, Anouar. "Modélisation mécanique et thermique du procédé de laminage asymétrique." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00609219.
Marchand, Jean-Luc. "Contribution à la modélisation du procédé de nitruration ionique." Vandoeuvre-les-Nancy, INPL, 1988. http://www.theses.fr/1988NAN10180.
Mathieu, Norman. "Modélisation numérique du procédé de planage des bandes minces." Thesis, Metz, 2011. http://www.theses.fr/2011METZ026S/document.
Leveling is a forming process used in the aluminum industry in order to correct flatness defects and minimize residual stresses in thin metallic strips thanks to bending under tension. After testing an analytical model of multiroll leveling and raising the limits of this approach, this thesis manuscript introduces a three-dimensionnal Finite Element model to simulate the sheet conveying in an industrial configuration of stretcher. It can compute plastic strains and residual stresses through width and thickness. Initial flatness defetcs are taken into account in the entering strip and we verify how they are corrected at the exit. Then, to reduce model size and computation time, a second approach with two elementary configurations coupling and data transfer is compared to whole model of stretcher. This alternative model is applied to study the profiled rolls effect. Finally, it predicts the deformed strip after springback and potential buckling phenomena
Akué, Asseko André Chateau. "Modélisation du procédé de soudage laser des composites thermoplastiques." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10066.
The composite forming uses technologies being used for the simpler thermoplastic parts forming as thermoforming or welding. This thesis proposed study of transmission laser welding process in unidirectional thermoplastic composites. Transmission Laser Welding technique presents specific advantages for industrial applications over other conventional technologies: the method is accurate, flexible, small heat affected zone, easy to automate and control and non-contaminant, absence of vibration during the welding process (contrary to the ultrasonic welding, friction welding), fast welding speed for welding plastic parts with an acceptable welding time. Transmission Laser Welding of composites involves two joining parts: one semi-transparent to the laser wavelength and the other part is absorbent in the same wavelength. The two parts are positioned together before the welding. The laser beam energy is transmitted through the semi-transparent material and is absorbed within the surface of the second materials. The bonding between the two components the two parts allows the heating of the semi-transparent part by thermal conduction. Thus, melting and fusion of the both materials interface occurs (the bonding between the two parts occurs when T > Tmelt in this area). However, some difficulties are experienced during this process: heterogeneous and anisotropic materials; problems of the laser beam transfer caused by the multiplication of fiber-matrix interfaces in materials. This is highly correlated to the energy arriving at the welding interface. Obtaining of a good quality of welded seam is conditioned by a good understand of material behavior under laser irradiation, based on a clear identification, modeling of optical and thermal phenomena involved
Tran, Hanh Nhi. "MODÉLISATION DE PROCÉDÉS LOGICIELS À BASE DE PATRONS RÉUTILISABLES." Phd thesis, Université Toulouse le Mirail - Toulouse II, 2007. http://tel.archives-ouvertes.fr/tel-00545951.
Mas, Cédric. "Modélisation physique du procédé de découpe de métaux par laser." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00003252.
Cherrier, Gaël. "Modélisation numérique de l’abattage humide comme procédé d’assainissement de l’air." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0306/document.
This PhD-Thesis is dedicated to the numerical modeling of aerosol particles scavenging by drops. Investigated situations are about aerosol particles of aerodynamic diameter ranging from 1 nm to 100 µm captured in the air by water drops of diameter varying between 80 µm and 600 µm, with corresponding droplet Reynolds number ranging between 1 and 100. This air depollution modeling is achieved in two steps. The first step consists in obtaining a scavenging kernel predicting the flow rate of aerosol particles captured by a drop in a situation where several collection mechanisms may take place (Brownian, phoretic, electrostatic and inertial scavenging). The aim of the second step is to propose a numerical simulation modeling the scavenging phenomenon. To do so, the scavenging simulation includes a RANS modeling for the air flow, a Lagrangian approach for the drops and an Eulerian approach for the aerosol particles. Thus, aerosol scavenging by drops is modeled by implementing the collection kernel defined previously into a sink term in the Diffusion-Inertia model of Zaichik et al., (2004)
Bezzina, Smail. "Modélisation théorique et numérique du procédé de découpage des tôles." Compiègne, 1996. http://www.theses.fr/1996COMPD874.
Pujol, Arnaud. "Modélisation du procédé de compostage - Impact du phénomène de séchage." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0015/document.
Composting may look like a simple process. However, it requires an important expertise, as the biological response is governed by the control parameters (temperature, oxygen, moisture content), involving many coupled phenomena. Given the complexity of the studied mechanisms and in order to optimize the process, using a composting model seems relevant to understand the mechanisms involved, identify the effects of coupling between these mechanisms, highlight some key factors or compare different scenarios, in order to optimize the industrial process. The state of the art of composting models in the literature shows that today, despite the large number of composting models, there is none that can predict, with a formulation in time and space, temperature, concentration of gases (oxygen, carbon dioxide, nitrogen, ...), moisture content, transfers between phases, degradation of the substrate, and take into account the changes in aeration. The development of a new model was therefore necessary to predict the evolution of these variables and study their coupling in the process. The technique of volume averaging applied to the pore scale equations has led to a composting model at the Darcy-scale. This model takes into account a gas phase, a liquid phase and a solid phase. The gas phase includes four species: oxygen, carbon dioxide, nitrogen and water vapor. In the liquid phase, only water is considered. Drying is integrated into the model as an exchange term between gas and liquid phases. Finally, the biological model, included in the composting model, allows to take into account the degradation of the substrate. It is divided into three fractions: readily hydrolysable, slowly hydrolysable and inert. The first two fractions are hydrolized, providing a readily assimilable soluble fraction. It is this fraction that is directly consumed by bacteria. In a composting process, degradation of organic matter is associated with oxygen consumption and production of carbon dioxyde, water and heat. The assumption of thermal and chemical local equilibrium was assumed in this work. However, for water, the two approaches (Local Equilibrium (LE) and Local Non-Equilibrium (LNE)) have been numerically tested. The results showed that when , the water mass exchange coefficient between gas and liquid phases, ranges from 1 to 4 s-1, the LE and LNE approaches are equivalent, with less computing time for the LNE case. Thus, for all future simulations, it was decided to adopt a LNE approach with a value of equal to 2.5 s-1. Tests were then carried out to show the consistency of the model. Given the large number of parameters, a sensitivity analysis was performed to determine the parameters that have the greatest impact on the process. This analysis showed that one must be cautious about the values used for the heat capacity, a coefficient of the sorption isotherm, many parameters from the biological model (ksH, krH, μmax, Xa,0, Tmax, Topt, Xi,0, Xrb,0) and porosity, because these are the parameters that affect mainly the process. Finally, the results provided by the model were compared with experimental results obtained at a pilot scale of 1/1000 using identical operating conditions. The composting experiments were carried out by Veolia Environment Research and Innovation with a mixture of household biowaste and green waste. The results on the 1/1000 scale pilot showed that the model is good at capturing the average change in temperature and concentration during the process. The temperature at the central point in particular is very well reproduced by the model. The same applies to the assessment of organic matter degradation. Simulations at industrial scale (1/1) have also been carried out. They have given promising results
Nguyen, Thu Ha. "Étude expérimentale et modélisation du procédé de séchage des végétaux." Thesis, Lorient, 2015. http://www.theses.fr/2015LORIS370/document.
Great research works support the sector of drying of fruits and vegetables in a number of ways. Each year, experimental results and mathematical modelling try through conventional and innovative technological processes to protect agricultural products from seasonality and variability in the market prices. Nonetheless, there still exist considerable issues to improve and control this strategic agricultural sector. Swell-drying is very relevant drying process coupling hot air dehydration with Instant Controlled Pressure Drop (DIC). In the present work, carrot and apple were used as a fruit and vegetable model. Scientific literature on drying is unanimous that the drying time decreases with increasing air temperature, decreasing air relative humidity, and reducing thickness. However, the effect of airflow velocity leads to contradictory conclusions. Some authors have claimed that it does not trigger any modification of drying; while some articles tried to establish empirical models of the effective diffusivity versus airflow velocity; what is fundamentally erroneous. This thesis aims at analyzing external and internal transfer phenomena during drying. So, it was possible to recognize the Critical Airflow Velocity CAV depending on the effective diffusivity and the product size, to have the internal water transfer as the limiting phenomenon. From experimental results, an empirical model was established between the effective moisture diffusivity and airflow temperature, water content, and absolute expansion ratio
Laffargue, Johann. "Etude et modélisation des instabilités du procédé de soufflage de gaine." Phd thesis, École Nationale Supérieure des Mines de Paris, 2003. http://pastel.archives-ouvertes.fr/pastel-00000432.
Duchez, Laurent. "Modélisation et contribution à l'industrialisation du procédé de rétification du bois." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2001. http://tel.archives-ouvertes.fr/tel-00872327.
Vigne, Emmanuelle. "Étude et modélisation dynamique d'un procédé par biofiltration en nitrification tertiaire." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24963/24963.pdf.
Nitrogen removal in wastewater treatment plants becomes more and more used due to the harmful impact of nitrogen on the natural environment. After medium and highly loaded secondary treatment, practitioners could use biofiltration for tertiary nitrification, which is an intensive process adapted in areas with strong land pressures. This technology can remove very strong loading rate in a restrained space by its capacity to developp an important amount of active biomass into the filtering media. Simulation of such technique’s behaviour is not direct, and few studies led to a useful tool for engineers. However, its use is necessary in order to validate design in real operating conditions and dynamic conditions. The main objective of this work concerned the study and validation of a biofiltration model which already exists but has still never been tested with real data in tertiary nitrification treatment. In order to reach this objective, the behaviour of a semi-industrial pilot plant, fed by real domestic effluent from an activated sludge plant, was studied. In order to operate in dynamic conditions, different daily volumetric nitrogen loading rates were applied, in which dynamic peak-loads were carried out. The calibration and the validation of the model parameters were done thanks to on-line ammonia and nitrate analysers during one year and more, in association with a calibration procedure and a sensitivity analysis. The protocol required the implementation of specific tests for characterization of the biofilm inside the filtering media. These tests increased the number of the observed state variables to compare with the model predictions. That allows a better evaluation of the model robustness. At the same time, the dynamics of processes taking part in the nitrogen removal into the biofilm were investigated thanks to these specific tests. So, parameters which influence the nitrogen removal, overall performance, activity and quantification of autotrophic biomass, its solids retention time or its repartition inside the filtering media, could be determined. Combination of experimental observations and numerical modelling highlighted the capacity of the biofiltration model to provide good predictions on real nitrogen removal performances. Furthermore, this study allowed to evaluate mechanisms included in the model and their limitations with different operating conditions applied in the system. Finally, weaknesses of the model concerning solids compounds and the evolution of head loss in the pilot plant were established.
Hugo, Mathilde. "Contribution à la modélisation du procédé de refusion sous laitier éléctroconducteur." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0091.
The ElectroSlag Remelting process (ESR) is widely used to produce high added value alloys for critical applications (aerospace industry, nuclear plants, etc.). Trial-and-error based approaches being expensive, numerical simulation is fundamental to improve the knowledge and the understanding of this complex process. The Institut Jean Lamour has been developing for several years a numerical code to simulate the melting of a consumable electrode, supposedly perfectly cylindrical, within a mold assumed to be perfectly electrically insulated from the electrode-slag-ingot system. Based on these assumptions, the 2-D axisymmetrical transient-state numerical model accounts for electromagnetic phenomena and coupled heat and momentum transfers, to simulate the continuous growth of the electroslag remelted ingot and the solidification of the metal and slag. Recent studies on the ESR process are challenging the insulated mold hypothesis. Therefore, the main objective of the thesis is to acknowledge and study the existence of a mold current during an ESR remelting. A first model has been set-up, aimed to simulate the electromagnetic phenomena in the whole system for a simplified geometry. The possibility of the existence of such a mold current was confirmed. Based on this work, a fully-coupled model has then been developed and the results have been compared with experimental data to check the validity of the modifications. The influence of slag properties and operating parameters on the final quality of the ingot has been tested
Longuet, Arnaud. "Modélisation du procédé de projection laser : Application au Ti-6Al-4V." Paris, ENMP, 2010. https://pastel.hal.science/tel-03767643.
Direct laser deposition technology is an innovative process which allows near net shape part manufacturing directly from computer aided design data. However, local variations of temperature during manufacturing produce heterogeneous microstructures and residual stresses. In order to improve understanding of the process and to predict the residual stresses and strains in the part after manufacturing, a finite element modeling of the process has been developed. The material considered here is Ti-6Al-4V. As it is well known in the litterature, it allows to perform a macroscopic modeling of the process. The manufacture of a single row wall has been considered as a basis for the simulation. This part remains simple but still exhibits the thermomechanical cycling that happens during manufacturing. A robust method that includes a technique to activate the elements has been implemented in Zset/ZéBuLoN in order to simulate the process. The first step of the finite element simulation is the computation of the thermal fields. In fact the problem is weakly coupled and the thermal simulation of the process will be an input for the metallurgical and the mechanical part of the model. The thermal calculations have been successfully calibrated by means of thermocouple measurements. Considering the important thermal cycling, a Johnson-Mehl-Avrami model would be too limited to describe the phase transformations. A model taking into account the diffusion of Vanadium through the phases in Ti-6Al-4V has been designed. Morover the process shows different kind of grain structure : columnar or equiaxed. A model relying on solidification map of Ti-6Al-4V has been implemented. These two models have been successfully compared to Julie Maisonneuve’s PhD thesis work. Finally, a mechanical model predicts the residual strains and stresses in the part during manufacturing. This model has been validated by analysing the bending of the substrate in the experiments. It provides a good prediction of the variation of the macroscopic values at stake during the manufacturing of a part with direct laser deposition process and gives access to the residual fields
Fayolle, Francine. "Analyse et modélisation des dépots d'oxyde de silicium par procédé LPCVD." Toulouse, INPT, 1993. http://www.theses.fr/1993INPT029G.
Laffargue, Johann Pierre René. "Etude et modélisation des instabilités du procédé de soufflage de gaine." Paris, ENMP, 2003. https://pastel.archives-ouvertes.fr/pastel-00000432.
Haunold, Christophe. "Extraction de pyrethrines : analyse du procédé discontinu et de l'influence des ultrasons : modélisation et mise en oeuvre d'un procédé continu." Toulouse, INPT, 1991. http://www.theses.fr/1991INPT023G.
Rélot, Emmanuelle. "Modélisation physique et numérique du procédé de mise en forme par trempage." Phd thesis, École Nationale Supérieure des Mines de Paris, 2008. http://tel.archives-ouvertes.fr/tel-00357876.
Houillon, Marie. "Modélisation du procédé de fluotournage du tantale et du traitement thermique associé." Phd thesis, École Nationale Supérieure des Mines de Paris, 2009. http://tel.archives-ouvertes.fr/tel-00443562.
Gonzalez-Ramirez, José Enrique. "Contribution au contrôle par la modélisation d'un procédé de cristallisation en continu." Phd thesis, AgroParisTech, 2012. http://pastel.archives-ouvertes.fr/pastel-00876943.
Vo, Van André. "Modélisation numérique et expérimentale du procédé de frittage en métallurgie des poudres." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0004/MQ33777.pdf.
Hamadeh, Hamzeh. "Modélisation mathématique détaillée du procédé de réduction directe du minerai de fer." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0274/document.
This thesis is dedicated to the modelling of the iron ore direct reduction process, an attractive alternative process for making steel in the context of the reduction in CO2 emissions. The shaft furnace, the core reactor of the process, is divided into three sections (reduction, transition and cooling). The mathematical model developed to simulate this reactor is based on a detailed and faithful description of the main physical-chemical and thermal phenomena involved. The model is a two-dimensional, steady state and multi-scale. The moving bed is comprised of pellets of grains and crystallites. Eight heterogeneous chemical reactions and two homogeneous chemical reactions were taken into account. The local mass, energy and momentum balances were solved numerically using the finite volume method. The model was successfully applied to simulate the shaft furnace of two direct reduction plants of different capacities. The results obtained provide new insights on the internal behaviour of the furnace and highlight zones of uneven performance. After the addition and coupling of a reformer model, the shaft furnace model was used for parametric calculations, in particular when considering changes in the composition of the reducing gases. Finally, new possibilities are presented for optimizing the direct reduction process, e.g. for increasing the production capacity and the degree of metallization of the produced iron
Tali-Maamar, Nadia. "Modélisation, analyse et commande d'un procédé biotechnologique à gradient spatial de concentration." Toulouse 3, 1994. http://www.theses.fr/1994TOU30031.
Texier, Sandrine. "Etude et modélisation du vieillissement d'un lit catalytique industriel : le procédé Méthio." Lyon 1, 1994. http://www.theses.fr/1994LYO10015.
Brandam, Cédric. "Optimisation des conditions opératoires d'un procédé de brassage : étude expérimentale et modélisation." Toulouse, INPT, 2001. http://www.theses.fr/2001INPT036G.
Relot, Emmanuelle. "Modélisation physique et numérique du procédé de mise en forme par trempage." Paris, ENMP, 2008. http://tel.archives-ouvertes.fr/tel-00357876.
Dip-coating is a process allowing the extraction of a thin layer of matter around a mould by dipping it in a bath of liquid. This is a common process extensively used in industries concerned, for example, with the application of protective or decorative coatings and also used to manufacture parts having a thin thickness such as gloves, mammal prostheses, medical capsules and condoms. The advantage of this process is its simplicity and its low cost; but it is difficult to control the thickness and its repartition around the object. The goal of this thesis is to numerically predict the thickness of the layer extracted on the mould. The mechanical and thermal balance equations are solved in the bath using a Lagrangian Finite Element approach with remeshing technique. The liquid/air interfacial tension is taken into account in order to avoid surface instabilities; the method used to implement interfacial tension in the modelling is based on the reformulation of the curvature with Laplace-Beltrami operator. Experimental researchs are also realized in order to characterize physically the liquids used in the bath
Nakouzi, Sawsane. "Modélisation du procédé de cuisson de composites infusés par chauffage infra rouge." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1865/.
Epoxy resins have several applications in the aerospace and automobile industry. Because of their good adhesive properties, superior mechanical, chemical and thermal properties, and resistance to fatigue and microcracking, they produce high performance composites. In the technology presented here, the composite is cured in an IR oven which includes halogen lamps. The liquid resin infusion (LRI) process is used to manufacture the composite, whereby liquid resin is infused through a fiber reinforcement previously laid up in a one-sided mold. These epoxy resins release an exothermic heat flux during the curing process, which can possibly cause an excessive temperature in the thickness. Consequently, for the production of high performance composites, it is necessary to know the thermal behavior of the composite during curing. In our work, we studied IR interactions with the composite, which is placed in an IR oven. Using an IR spectrometer Bruker Vertex 70 (1-27 µm), we measured radiative properties and determined the fraction of IR rays absorbed by the composite. Since it is necessary to optimize the manufacturing time and costs and to determine the performance of these composites, the purpose of this study is to model the IR curing of a composite part (carbon fiber reinforced epoxy matrix) in the infrared oven. The work consists in two parts. In the first part, a FE thermal model based on radiosity method was developed, for the prediction of the infrared incident heat flux on the top surface of the composite during the curing process. This model was validated using a reference solution based on ray tracing algorithms developed in Matlab(r) (In-lab software called Rayheat based on ray tracing algorithms is used to compute the radiative heat flux that impacts the composite). Through the FE thermal model, an optimization study on the percentage power of each infrared heater is performed in order to optimize the incident IR heat flux uniformity on the composite. This optimization is performed using the Matlab(r) optimization algorithms based on Sequential Quadratic Programming method. In a second part, the optimized parameters set is used in a three-dimensional numerical model which is developed in the finite element software, where the heat balance equation is coupled with the cure kinetic model of the resin. This numerical model allows calculation of the temperature distribution in the composite during curing, which is a key parameter that affects its mechanical properties. In this model, we can predict also the evolution of the degree of cure as function of time
Sibilia, Gautier. "Modélisation du soudage par point : influence des conditions interfaciales sur le procédé." Nantes, 2003. http://www.theses.fr/2003NANT2117.
In this work, we propose a simplified model of resistance spot welding on steel sheets. We use the Finite Element sofware SYSWELD® by the way of Electrical-Thermal-Metallurgic coupling. To define such a model, we need to identify the main process influencing factors. Besides, we have to dispose of right input data and pertinent information in order to validate the numerical results. Therefore, in this study; experimental investigations take an important place too. In particular, we have study the influence of electrode/sheet and sheet/sheet interfaces on the spot weld formation. This labour contributes to improve the mastery of a welding process, which the knowledge was essentially experience-based. The numerical model here developed should allow simplifying the welding parameters and weldability definition
Veynandt, François. "Cogénération héliothermodynamique avec concentrateur linéaire de Fresnel : modélisation de l’ensemble du procédé." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0116/document.
Linear Fresnel Reflector (LFR) is a promising Concentrating Solar Power technology. Research is booming and industrial applications are emerging. Applications range from small production units (heat, cold, electricity) to utility scale power plants (several tenths of MW). This PhD work establishes a global model of the solar process, in order to improve our knowledge of the system’s performances. It is a static model suited for a pre-design of the system. The model is chaining three parts. Radiative heat transfer in the optical concentrator is modelled by Monte Carlo statistical Method. The algorithm enables a detailed study of any geometrical configuration, especially through absorbed power flux maps on the receiver. The simulation tool is using the environment of development EDStar. The thermal model calculates analytically the useful thermal power, losses and temperature profiles along the receiver (glass cover, fluid, pipe...). The thermodynamic cycle is simulated analytically using the software Thermoptim. The studied application uses air as heat transfer and working fluid. Air directly feeds an Ericsson engine. The engine developed by LaTEP laboratory is promising for small scale cogeneration (1 to several tenths of kWel). The prototype Linear Fresnel Reflector built in Ecole des Mines d’Albi will enable experimental study of a solar process coupling an LFR concentrator and an Ericsson engine. The technology under study can feed a power plant or a cogeneration system in the industry, producing electricity and heat at 100 to 250°C. Hybridisation with an other energy source (biomass, gas...) and thermal storage (molten salt?) are key features to investigate. To optimise the operating strategy of the process, dynamic behaviour must be studied: a systemic or agent based model is a very relevant approach
Cloteaux, Anaëlle. "Conception, modélisation et réalisation d'un procédé d'élimination du formaldéhyde dans l'air intérieur." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0021/document.
In indoor air, many volatile organic compounds are present, including formaldehyde. The presence of this carcinogenic compound in indoor air is due to its abundant use in furniture and decoration materials. The objective of this work is to design a purification device, clean, safe and capable of removing formaldehyde from indoor air. The choice turned to a stand-alone air purifier. To protect users, the device must trap and completely degrade air pollutants without emitting by-products. Absorption was chosen as trapping method and photocatalysis as degradation technique. The cleaner coupling absorption and photocatalysis has been tested in the laboratory and a model was built to predict its efficiency to continuously degrade formaldehyde. The purifier designed for a real situation appears to have a small volume. An efficient, compact, quiet and attractively designed device is an advantage for this air purification solution is accepted and adopted by users
Depriester, Dorian. "Caractérisation et modélisation du procédé de fluotournage inverse à froid du TA6V." Thesis, Paris, ENMP, 2014. http://www.theses.fr/2014ENMP0038/document.
Flowforming is a means to produce seamless tubes by plastic deformation at room temperature. It consists in a tubular part, mounted on a mandrel, and a couple of rollers. While the mandrel is rotating, the roller translate along the tube axis. Because of the conical shape of the roller, the tube thickness reduces by cold plastic deformation, thus the tube elongates. Thanks to the high compressive stresses and to the incremental nature of the deformation process, flowforming can lead to a high thickness reduction and thus to high elongation of the deformed tubes. Ti-6Al-4V (also known as Ti64) is an α-β titanium alloy. Because of its high strength and its low density, Ti64 is the most widely used titanium alloy in aerospace industry. Nevertheless, flowforming of this alloy is a great challenge, considering its well known poor ductility at room temperature. In order to increase the "tube spinnability" of Ti64, first the flowformed material has been extensively investigated at microscopic scale (SEM, EBSD) as well as at macroscopic scale (mechanical properties). In addition, an experimental flowforming machine, equipped with load sensors, has been designed. It has provided valuable informations about the strain mechanism occuring during flowforming; furthermore, this experimental set-up has allowed to buid an adequate constitutive law for the plastic flow. Then, this law has been used to optimize the processing parameter, in order to avoid failure during the process
Vilfayeau, Jérôme. "Modélisation numérique du procédé de tissage des renforts fibreux pour matériaux composites." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0026/document.
The aeronautical industry faces new challenges regarding the reduction of fossil fuel consumption. One way to address this issue is to use lighter composite materials. The ability to predict the geometry and the mechanical properties of the unit cell is necessary in order to develop 3D reinforcements in composite materials for these aeronautical applications. There is a difficulty to get realistic geometries for these unit cells due to the complexity of their architecture. Currently, existing tools which model 3D fabrics at a meso scale don't take into account manufacturing process influence on the shape modification of the textile structure. There is already some numerical tools that can model the braiding or knitting process, but none have been developed for weaving so far. Consequently, this study deals with the numerical simulation of the weaving process to obtain a deformed dry fabric structure. During the weaving process of E-glass fabrics, achieved in our laboratory, it has been observed that large deformations led to the modification of transverse section of meshes, or local density changes, that can modify the fabrics mechanical resistance. For this reason, a numerical tool of the weaving process, based on finite element modelling, has been developped to predict these major deformations and their influences on the final textile structure. The correlation between numerical results and fabrics produced with glass fibres has been achieved for plain weave and 2-2 twill
Yatim, Houssein. "Etude théorique et expérimentale du procédé de distillation extractive discontinue." Lyon, INSA, 1993. http://www.theses.fr/1993ISAL0102.
The process of batch extractive distillation may provide the advantages of both the batch and the extractive distillation. So far this process has not been applied at all probably due to its complexity. An algorithm and a computer program were developed for simulating the experiments of a batch extractive distillation process (separation on acetone and methanol on a pilot plant column containing 32 bubble cap trays applying water as solvent). For the integration of the set of non-linear differential equations (component material balances) the Runge-Kutta method was used, the initial column profile was computed at total reflux. For saving computation time a two dimensional linear interpolation method was applied for the ternary mixture when calculating VLE. The experimental and calculated results are compared. The influence of the variation of the main operating parameters have been examined to evaluate the recovery of the separation of the process
Garcia, David. "Contribution à l'élaboration de modèles pour l'optimisation du procédé d'injection de polymères." Saint-Etienne, 2002. http://www.theses.fr/2002STET4015.
In the area of polymer injection, research is presently focused on 3D modelization. In particular, the appropriate simulation of 3D mould filling is crucial and opens large vistas : thorough understanding of welding areas ,"fountain effect" observation, etc. This research direction is attractive. Nevertheless, a state-of-the-art study shows that there is almost no model which copes with tools conception. The underlying question is the lack of specific mathematical models. We have developed such models for filling phase and we have covered two main needs. The first is the optimal placement of injection points in order to minimize final injection pressure ; it aims at the determination for a given shape, to the optimal injection positions. The second deals with the controlled propagation. The purpose of this approach is to control the polymer front propagation during the filling time in order to have the less possible defects. This document is a first investigative step for future Computer Assisted Tools Conception
Lange, Christian. "Étude physique et modélisation numérique du procédé de sertissage de pièces de carrosserie." Phd thesis, École Nationale Supérieure des Mines de Paris, 2006. http://pastel.archives-ouvertes.fr/pastel-00001760.
Leinekugel-le-Cocq, Damien. "Contribution à la modélisation dynamique simplifiée d'un procédé d'adsorption modulée en pression (P.S.A.)." Phd thesis, Université Claude Bernard - Lyon I, 2004. http://tel.archives-ouvertes.fr/tel-00008325.
capable de prédire le régime transitoire et d'estimer rapidement
l'état des procédés cycliques de séparation de gaz par adsorption
modulée en pression (P.S.A.) en régime établi. En effet, des
problèmes de temps de calcul se posent encore de nos jours, alors
qu'un simulateur rapide et fiable est nécessaire au
dimensionnement optimal du procédé, voire son contrôle.
Dans ce but, deux approches ont été adoptées. La première consiste
à accélérer la simulation de chacune des étapes du cycle en
simplifiant le modèle de grains d'adsorbant bidisperses. La
démarche suivie pour simplifier le modèle intra-granulaire est
proche de celle employée pour établir le modèle classique de
« Linear Driving Force ». Une étude a été menée concernant le
choix des variables d'état et la répartition spatiale des
résistances au transfert de matière dans le grain. Ces deux
paramètres ont en effet tous deux une influence sur la structure
du modèle. Le modèle global de colonne basé sur ce modèle
intra-granulaire conduit à des simulations de courbes de perçage
en bon accord avec celles de la littérature.
La seconde approche repose sur l'approximation du procédé cyclique
par un procédé continu équivalent. Le simulateur basé sur ce
modèle permet d'estimer à la fois la mise en régime et l'état du
système en régime établi de façon quasi-instantanée. Pour des
séparations de type cinétique, les simulations obtenues avec ce
modèle sont en bon accord avec celles obtenues avec un modèle
cyclique classique.
L'autre objectif de ce travail était de concevoir un pilote de
procédé P.S.A. intégralement contrôlé par informatique, permettant
de suivre les compositions de sortie, ainsi que les profils de
température dans chaque colonne. Une étude expérimentale a été
menée sur ce pilote. Elle porte sur la séparation de mélanges de
méthane et de dioxyde de carbone sur une zéolithe 5A. Cette étude,
associée aux résultats expérimentaux de la littérature, permet de
valider notre premier modèle.
Anthony, Guiot. "Modélisation et simulation du procédé de prépolissage automatique sur centre d'usinage 5 axes." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00816769.
Terreros, Iñigo. "Modélisation DEM thermo-mécanique d'un milieu continu. Vers la simulation du procédé FSW." Phd thesis, Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. http://pastel.archives-ouvertes.fr/pastel-00996971.
Guiot, Anthony. "Modélisation et simulation du procédé de prépolissage automatique sur centre d'usinage 5 axes." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-01044984.