Дисертації з теми "Modélisation du corps en 3D"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Modélisation du corps en 3D".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Capanna, Claire. "Reconstruction 3D de petits corps par photoclinométrie." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4757/document.
Повний текст джерелаMy PhD work consists in the establishment of a method of 3D reconstruction. Studied objects are small solar system bodies that have been observed in the visible range by sensors during space missions. The proposed method (called photoclinometry by deformation ) consists in deforming a mesh until the synthetic images of the mesh correspond to the observed ones, this is done in an optimization loop . This method requires an initial mesh close to the desired solution. We implement this method in a multiresolution scheme (multiresolution photoclinometry by deformation) to obtain a reconstruction without an apriori shape . However, this method does not allow models containing millions of facets . A third method has been developed to overcome this problem, it consists in cutting the mesh into different pieces and apply the multiresolution method photoclinometry by deforming to each of these pieces . By merging these pieces , we obtain meshes of several millions facets (high resolution model). These methods have been tested by reconstructing the two asteroids (Steins and lutetia) flown-by the Rosetta spacecraft of the European Space Agency (ESA)
Ghomari, Tewfik. "Contribution à la modélisation 3D volumique de la mise en forme des corps plastiques creux." Reims, 2007. http://www.theses.fr/2007REIMS001.
Повний текст джерелаThe principal objective of this thesis is to develop a software of working of the plastic bodies hollow 3D axisymmetric, with a precise distribution of the thicknesses and a cost of less low calculation. That became possible with the development of a new finite element of axisymmetric solid (baptized SFRQ-Axi) based on the kinematic concept of rotation of a space fiber (Space Fiber Rotation concept). The developed finite element has the advantage of converging quickly for the problems with contact presenting of the flexing areas. The choice of the algorithm of search for contact plays also a part in the fast treatment of the management of the nodes candidates to the contact. A simple algorithm of research local is worked out to test the penetration of the segments “masters” by the “Slavic” nodes. Encountered numerical difficulties to which we had faced, and who are due to the strong not geometrical linearities, material and especially with nonthe linearities of contact. Let us underline also the difficulty in managing the incompressibility of the voluminal or axisymmetric finite elements 3D. Two approaches of implicit calculation and clarifies are treated for an example of feeding-bottle. The results obtained shows the good precision of implicit calculation compared to explicit calculation. The tests of validation of the SFRQ-Axi element with contact on a test of inflection of a circular plate, being rolled up on a rigid torus, shows the good speed of convergence and a better precision of the results thicknesses. The results of the tests of working give also a good distribution thicknesses inside the beach given by the experimental results
Guillot, Olivier. "Maillage multirésolution de surfaces : modélisation et maillage de formes humaines 3D." La Rochelle, 2008. http://www.theses.fr/2008LAROS232.
Повний текст джерелаIn this thesis, we developped a surface subdivision that handles different kind of natural discontinuities of surfaces (darts, corners, creases and bounds) and the irregularities of the mesh that represents it. The aim of such a subdivision is to create limit surfaces that keep the natural discontinuities in order to enhance the quality of the multiresolution analysis based on that subdivision. We use the square root 3-subdivision because the resulting meshes grow slower. The multiresolution analysis by wavelets of a mesh of surface split the low frequencies and the higher ones, in order to obtain an approximation of the mesh and "details". Details can be truncated without creating great losses in the result of the synthesis. This property permits data compression of the details. Because the wavelet function is based on our square root 3-subdivision it handles natural discontinuities of the surfaces. This gives even smaller details for meshes with sharp edges. In order to analyse a mesh n times, this mesh must have a topology compatible with n subdivisions. If the surface contains discontinuities, n should be even. We built software tools in order to create a remeshing method that generates meshes compatible with those topologies. All this features are available in MEFP3C
Champin, Cédric. "Modélisation 3D du chauffage par rayonnement infrarouge et de l'étirage soufflage de corps creux en P.E.T." Phd thesis, École Nationale Supérieure des Mines de Paris, 2007. http://tel.archives-ouvertes.fr/tel-00270197.
Повний текст джерелаChampin, Cédric. "Modélisation 3D du chauffage par rayonnement infrarouge et de l'étirage soufflage de corps creux en polyéthylène téréphtalate." Paris, ENMP, 2007. http://www.theses.fr/2007ENMP1519.
Повний текст джерелаOur study addressed the 3D modeling of the infrared radiation reheating step and the stretch blow molding of cold injected preforms used for P. E. T. Bottles. The goal was to calculate the full temperature profile of the preform at the exit of the furnace and the final thickness of the bottle at the end of the blow molding, using a single finite element numerical tool. The interaction between the halogens lamps and the semi-transparent material has been modeled using a ray tracing method, taking into account reflectors. The volumetric source term arising from irradiation and inserted in the heat assumption has been calculated through a Beer-Lambert law applied to each ray emitted by the tungsten filament or reflected by the ceramic. The preform rotation and translation have been modeled thanks to a mapping of the irradiative heat flux divergence calculated initially onto the configuration at the time considered. The study of the stretching and blow molding of the preform have given rise to the implementation of Mooney-Rivlin hyperelastic and G’Sell viscoplastic behavior laws. Numerical developments have been validated by a comparison with tensile tests, a thick tube and a thick sphere blowing analytical models. The remeshing method necessary for large strain and the contact algorithms accuracies implemented in Forge3® software allowed to demonstrate the feasibility of the 3D numerical modeling of stretch-blowing of P. E. T. Preforms
Hamad, Moez. "Classification non-supervisée de morphologies 3D de corps humain pour la mise en œuvre de mannequins morphotypes adaptatifs." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10046/document.
Повний текст джерелаIn this PhD we investigate the problem of 3D human morphologies classification. The aim of this research is to define an exhaustive methodology to obtain a clustering of human morphology shapes representative of a population and to extract the most significant morphotype of each class. An overall geometric shape analysis of body surfaces coupled with technique of unsupervised clustering is implemented on a database of 478 scans of woman bodies from the French Sizing Survey (2006) conducted by IFTH.The description of the 3D scans is performed with a computation of the geodesic distributions based on anthropometrics feature points placed on the surface of human torso. This descriptor enables a quantitative comparison of the morphologies in 3D space. These geodesic distributions are then used as inputs for the two clustering methods we have achieved. After the classification, three morphological classes represented by three morphotypes are extracted from the database. Based on these morphotypes, we developed a design method of adaptive models. Two types of the mannequin adjustment, depending on its volume and height, have been developed to control it via included individuals in the obtained classes or via an industrial size system
Néri, Adrien. "Etude de la différenciation métal-silicates dans les petits corps du système solaire : une approche pluridisciplinaire." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30184.
Повний текст джерелаMany early-accreted small bodies of the Solar System experienced metal-silicate differentiation. This process caused the metal and silicate to separate and may have led to the formation of a metallic core. This PhD focused on understanding the physical processes that drove this differentiation and their consequences on the materials found in the meteoritic record. In order to provide the most plausible models, a joint experimental and modeling approach was used. A three-phase experimental system was designed to be representative of natural samples undergoing differentiation and analyzed using computed 3D X-ray microtomography and electronic techniques. Metal-silicate differentiation mostly occurs though the percolation of an interconnected metallic network. However, significant extraction of the silicate melt is required to allow the formation of such a network. Differentiation remained partial in primitive achondrites due to late accretion and low silicate grain sizes that did not allow complete melting of the iron-rich phases or efficient melt extraction. Complete differentiation occurs for bodies accreted earlier that experienced a magma ocean stage. Models suggest that a significant fraction of the silicates does not melt (corresponding to the rheological threshold), preventing the metal particles from settling. At the end of the magma ocean phase, compaction and efficient extraction of the melts favors differentiation and the formation of achondrites (pallasites, stony and iron meteorites)
Moreau, Baptiste. "Modélisation statistique de la géométrie 3D de la cage thoracique à partir d'images médicales en vue de personnaliser un modèle numérique de corps humain pour la biomécanique du choc automobile." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS030/document.
Повний текст джерелаRoad safety is a major issue of public health and personal safety. According to the World Health Organization (WHO), nearly 1.2 million people die each year worldwide due to road accidents (2015). According to accident data, 36.7% of serious injuries are caused by thoracic injuries (Page et al., 2012). The aim of biomechanics in passive safety is to improve our understanding of the human body in order to build better tools for assessing the risk of injury.Numerical human body models are used to virtually simulate the conditions of an accident. Today, they are increasingly used by car manufacturers and equipment manufacturers to better understand injury mechanisms. However, they exist only in few sizes and do not take into account the morphological variations observed in the population.3D medical imaging gives access to the geometries of the different anatomical structures that make up the human body. Today, hospitals are full of 3D images covering a very large part of the population in terms of age, body size and sex.The overall objective of this thesis is to statistically model the 3D geometry of the rib cage from medical images in order to personalize a numerical human body model to simulate car crash conditions.The first objective is to develop a segmentation process based on CT-scans in order to obtain geometric data adapted to the construction of a statistical model of shape of the rib cage.The second objective is to build a statistical model of the shape of the rib cage, taking into account its articulated structure.The third objective is to use the statistical model of the rib cage to deform a numerical human body model, in order to study the influence of certain parameters on the risk of injury
Quiquet, Aurélien. "Reconstruction de la calotte polaire du Groenland au cours du dernier cycle glaciaire-interglaciaire à partir de l'association de la modélisation numérique 3D et des enregistrements des carottages glaciaires profonds." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENU006/document.
Повний текст джерелаThe Greenland ice sheet represents a potential sea level rise contribution of 7.3 meters. When drastic changes are recently observed, multi-centennal futur projections are urgently needed. 3D numerical modelling is one of the tools to realize these projections. This work intensively incorporates the use of Greenland deep ice core drillings, which represent an important amount of information of past states of the ice sheet. The validity of the reconstructions are thus assured by constant back and forth between observations and simulations. Robustness of these reconstructions and of future projections are largely questionned through wide sensitivity experiments. The ice sheet model calibration is performed during the last deglaciation considering the numerous constraints during this period. Given that, scenarios of ice sheet states during the whole last climatic cycle, in particular during the last interglacial, the Eemian, potential analogue for a future climate
Benchiheub, Mohamed-El-Fatah. "Contribution à l'analyse des mouvements 3D de la Langue des Signes Française (LSF) en Action et en Perception." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS559/document.
Повний текст джерелаNowadays, Sign Language (SL) is still little described, particularly for what concerns the movement of articulators. Research on SL has focused on understanding and modeling linguistic properties. Few investigations have been carried out to understand the kinematics and dynamics of the movement itself and what it brings to understand the LS SL generated by models. This thesis deals with the analysis of movement in the French Sign Language LSF with a main focus on its production as well as its understanding by deaf people.Better understanding the movement in SL requires the creation of new resources for the scientific community studying SL. In this framework, we have created and annotated a corpus of 3D motion data from the upper body and face, using a motion capture system. The processing of this corpus made it possible to specify the kinematics of the movement in SL during the signs and the transitions.The first contribution of this thesis was to quantify to what extent certain classical laws, known in motor control, remained valid during the movements of SL, in order to know if the knowledge acquired in motor control could be exploited in SL.Finding relevant information of the movement that is crucial for understanding SL represented the second part of this thesis. We were basically interested to know which aspects of the movement of SL production models should be replicated as a priority. In this approach, we have examined to what extent deaf individuals, whether signers or not, were able to understand SL according to the amount of information available to them
Chi, Cheng. "Personalized pattern recommendation system of men’s shirts based on precise body measurement." Electronic Thesis or Diss., Centrale Lille Institut, 2022. http://www.theses.fr/2022CLIL0003.
Повний текст джерелаCommercial garment recommendation systems have been widely used in the apparel industry. However, existing research on digital garment design has focused on the technical development of the virtual design process, with little knowledge of traditional designers. The fit of a garment plays a significant role in whether a customer purchases that garment. In order to develop a well-fitting garment, designers and pattern makers should adjust the garment pattern several times until the customer is satisfied. Currently, there are three main disadvantages of traditional pattern-making: 1) it is very time-consuming and inefficient, 2) it relies too much on experienced designers, 3) the relationship between the human body shape and the garment is not fully explored. In practice, the designer plays a key role in a successful design process. There is a need to integrate the designer's knowledge and experience into current garment CAD systems to provide a feasible human-centered, low-cost design solution quickly for each personalized requirement. Also, data-based services such as recommendation systems, body shape classification, 3D body modelling, and garment fit assessment should be integrated into the apparel CAD system to improve the efficiency of the design process.Based on the above issues, in this thesis, a fit-oriented garment pattern intelligent recommendation system is proposed for supporting the design of personalized garment products. The system works in combination with a newly developed design process, i.e. body shape identification - design solution recommendation - 3D virtual presentation and evaluation - design parameter adjustment. This process can be repeated until the user is satisfied. The proposed recommendation system has been validated by some successful practical design cases
Yousfi, Wadii. "Modélisation thermomécanique 3D en fraisage." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0297/document.
Повний текст джерелаThis thesis is focused on 3D thermomechanical modeling in milling configuration. In order to determine, for each insert orientation and each tool angular position, the complete actions torsor (forces and moments) three parts have been developed in this work.Based on the slip lines in the three cutting areas, an orthogonal cutting model was developed. The tool edge radius is built in modeling and model results are sensitive to this parameter. The model was validated by comparison with experimental tests.For two types of insert, with straight and round edge, the kinematic study along the cutting edge allowed to determine the instantaneous kinematic torsor at each point. This part has defined a new cutting velocity component dependent of tool angular position. The inclination of the edge generates a parallel velocity to the cutting edge (perpendicular to the cutting plane in orthogonal configuration) that participates in the kinematic behavior of the material in the primary and secondary shear zones.A 3D solid modeling in the primary and secondary cutting zones helped to define the cartography of strain and strain rate. This approach was based on kinematic data and appropriate boundary conditions. The gradients of stresses and velocities are the source of the appearance of the cutting moments
Guerber-Cahuzac, Chloé. "Le corps réinventé : sens et enjeux de la modélisation du corps humain par le cinéma." Paris 3, 2003. http://www.theses.fr/2003PA030033.
Повний текст джерелаSubordinated to the narrative, the body in cinema is often reduced to actions, to legible symbols. To reappear as itself, it must revolt against the rules of fiction and become "an opposing body. " This reinvention is governed by the analogical specificity of the medium. To distinguish the particularities of the filmed body and of its modeling, we evoke time-lapse photography, visual anthropology, sculpture, painting, and dance. Our aesthetic approach thus integrates historical, cultural, anthropological, and ethical dimensions. Then, four specific cases illustrate the construction of the body against the narration : the Keatonian character ; the Hollywood model resulting from censorship in the 1930s ; the motif of the fragmented body in the French cinema of the 1960s ; the exhausted body filmed by John Cassavetes. Little by little, concepts emerge to remind us that all reinventions of the body bring together a singular universe, a collective imagination, and the status of the medium
Meseure, Philippe. "Modélisation de corps déformables pour la simulation d'actes chirurgicaux." Lille 1, 1997. http://www.theses.fr/1997LIL10019.
Повний текст джерелаLontos, Athanasios. "Modélisation et simulation 3D de la morphogenèse." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM064/document.
Повний текст джерелаThe embryo of the Drosophila Melanogaster undergoes a series of cell movements during its early development. Gastrulation is the process describing the segregation of the future internal tissues into the interior of the developing embryo. Gastrulation starts with the formation of the ventral furrow, a process commonly known as the ventral furrow invagination. During this process, the most ventrally located blastoderm cells flatten and progressively constrict their apical sides until they are wedge shaped. As a result of these cell-shape changes, the blastoderm epithelium first forms an indentation, the ventral furrow, which is then completely internalized. We focus on the study of the mechanisms that drive the invagination. The main questions that gave birth to this thesis are: “What is the role of the apical constriction of the ventral cells in the invagination?” and “Once the ventral cells are internalized, what is the mechanism that drives the ventral closure?” We attempt to answer to these two questions from a biomechanical point of view. For this purpose, a 3D mesh of the embryo of the Drosophila Melanogaster has been created. Based on this mesh, two “a minima” biomechanical models of the Drosophila embryo have been created, a physically based discrete model and a model based on the Finite Element Method. The results of the simulations in both models show that the geometry of the embryo plays a crucial role in the internalization of the ventral cells. The two models efficiently simulate the internalization of the ventral cells but are incapable of reproducing the ventral closure. We hypothesize that the ventral closure can be explained by the interplay of forces developed in the embryo once the internalized ventral cells undergo cell division. We propose an approach to divide elements in a Finite Element Mesh and we integrate it to the Finite Element Model of the Drosophila Melanogaster
Nguyen, Ngoc Thanh-Hà. "Physique, modélisation et simulation des écoulements compressibles turbulents d'arrière-corps." Toulouse, INPT, 1994. http://www.theses.fr/1994INPT093H.
Повний текст джерелаSaint-Cast, Frédéric. "Modélisation de la morphodynamique des corps sableux en milieu littoral." Bordeaux 1, 2002. http://www.theses.fr/2002BOR12462.
Повний текст джерелаDeslandes, François. "Modélisation de la dynamique des corps lipidiques chez Arabidopsis thaliana." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLA042.
Повний текст джерелаThe aim of the PhD project is to dissect the mechanisms involved in the phenotype of lipid droplets both at the cellular level and the seed level. Studying a model of a lipid droplet embedded in the leaflets of a lipid bilayer reveals the existence of a critical volume at which the shape of the droplet breaks from a symmetrical elongated lens to a spherical protrusion. This budding mechanisms provides new insights in the formation of lipid droplets. Segmentation and tracking of lipid droplets from timelapse confocal microscopy images allows the detection of lipid droplets fusion events. A method based on the conservation of volume during the fusion event is developed and applied to detect fusion events for several embryos of A. thaliana. A model of the coalescence of lipid droplets during the development of early A. thaliana embryos is developed. The fusion rate is estimated and compared in different wild type and mutant embryos. The estimation is based on lipid droplets volumes measured from images at different stages of the development of the embryos
Lidouh, Abdeluaab. "Homogénéisation de frontière pour la modélisation du contact entre un corps déformable non linéaire et un corps rigide." Aix-Marseille 1, 1993. http://www.theses.fr/1993AIX11010.
Повний текст джерелаDubois-Boissier, Marie-Dominique. "Modélisation d'un neurone du striatum." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE19004.
Повний текст джерелаEscoda, Julie. "Modélisation morphologique et micromécanique 3D de matériaux cimentaires." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00741312.
Повний текст джерелаZhang, Cheng. "Contribution à la modélisation morphofonctionnelle 3D de l’épaule." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0072/document.
Повний текст джерелаThree-dimensional subject-specific models are increasingly requested for surgical planning and research in biomechanics. The main objective of this cotutelle thesis was to improve the 3D reconstruction method using biplane radiography images proposed by Lagacé, Ohl et al., in order to facilitate its application in clinic, especially to assist surgical planning and/or post-surgical evaluation. The low-dose biplane radiography EOS was used and an improvement to the reconstruction method was proposed. Fourteen clinical indices used more or less routinely in clinical diagnosis for monitoring of shoulder disorders and for surgical planning and postoperative evaluation were calculated and evaluated. The accuracy is acceptable and reproducibility is similar to what is presented in the literature. The proposed approach brings an improvement of reconstruction in a context where it would be interesting for clinical routine use. Although improvements are required, this contribution brings a stone to the analysis of intact and pathological joint and is promising as to the possibility of its presence in the clinical routine for evaluating pre- and post-operative surgery
Rakotoarisoa, Hery. "Modélisation géométrique et optimisation de structures géologiques 3D." Lyon 1, 1992. http://www.theses.fr/1992LYO19004.
Повний текст джерелаNguyễn, Thiết Lập. "Modélisation de l'interaction entre le coussinet et le corps de bielle." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2278/document.
Повний текст джерелаThe connecting rod is not a single body but a multi-body solid. A non-appropriate screw tightening, coupled with the solid discontinuities, can lead to undesirable phenomena such as the rotation of the shell in its housing. Despite modern numerical tools, capable to predict the bearing EHD behaviour, there are still many damages related to cumulative microslip between the bearing shell and the conrod body. The difficulty of modelling the shell/conrod contact is mainly due to the interaction between the solids and the operating conditions. This study presents a solution to analyse this problem, by coupling an elastohydrodynamic (EHD) software (ACCEL) with a commercial software (ABAQUS) able to predict the frictional contact between the shell and the conrod. After a literature review of previous studies dedicated to the numerical and experimental modelling of connecting rod bearings, the first part is dedicated to a description of the numerical models used to predict the EHD behaviour of lubricated bearings. Follows the presentation of the techniques used to study the dry frictional contact mechanics. The next part presents the adopted solution used to couple the two software. The model was first validated in the case of a bearing submitted to a rotating load. Subsequently, several parametric calculations are presented. We were able to show the influence of the operating conditions (load diagram, velocity,...) as well as other characteristics of the conrod (friction coefficient, thickness of the shell, etc.) on the performances of the bearing and more exactly on the microslip between the shells and the conrod body
Quetel, Eric. "Modélisation et simulation de contacts lubrifiés dans les systèmes multi-corps." Valenciennes, 2011. https://ged.uphf.fr/nuxeo/site/esupversions/84b3ed80-36b5-429f-a869-0d38f7165d4a.
Повний текст джерелаLifetime predictions and the improvement of the engine effectiveness represent nowadays parts of the most important commercial criteria in the automobile industry in order to response to the new environmental norms and to the constant growth of the market for low-cost components. In the different involved lubricated mecanisms, the ratio of the surface asperity heights to the lubricant film thickness has a decisive influence on the friction forces and thus on the energy dissipation and on the components wear. However, only a few simulation tools are nowadays available for the investigation of such tribological systems constraining the developers to often use their proper know-how or to conduct generally expensive measurements. In order to improve the dimensioning methods, three models are developed for the calculation of non-conforming elastohydrodynamic contacts, particularly for point and line contacts, and are applied to the simulation of cam-roller tappet contacts in high-pressure common-rail pumps and roller-raceway contacts in roller cell pumps. The first model is a one-dimensional representation of the elastohydrodynamic behaviour for heavily loaded contacts. It is based on the assumption that the contact pressure distribution may be approximated from the pressure distribution obtained in dry contacts and evaluate the central lubricant film thickness by means of dimensionless characteristic values. A simplified mixed lubrication model is additionally included. For the second and the third models, a more accurate solution method is adopted in order to consider locally the fluid-structure interaction. A discrete solution of the contact pressure and of the lubricant film thickness is obtained for point and line contacts using the multigrid technique. All three contact models are implemented as general force components or as contact elements in the multi-body system environment ADAMS/View from MSC. Software. Results from the discrete solver conform to those produced with the 1D model, especially for the central lubricant film thickness and confirm the assumption that the contact pressure distribution in heavily loaded elastohydrodynamic contacts approaches that in dry contacts. A robust coupling between the discrete solver for elastohydrodynamic point contacts and the multi-body system environment is achieved. However, instabilities are encountered by applying the solution algorithm to line contact problems due to incompatibilities with the multi-body system environment. Additional investigations are then required before employing the latter to industrial systems and the enhancement capability of the multi-body system environment to such complicated algorithms is questioned. Finally, successful applications of the unidimensional model in a high-pressure pump and in a roller cell pump are presented
Mellah, Amine. "Modélisation statistique d'antennes dans leurs environnements." Phd thesis, Université Paris Sud - Paris XI, 2010. http://pastel.archives-ouvertes.fr/pastel-00006290.
Повний текст джерелаGaro, Anais. "Modélisation du corps vertébral en chargement dynamique : intégration de l'effet de l'âge." Phd thesis, Université de la Méditerranée - Aix-Marseille II, 2010. http://tel.archives-ouvertes.fr/tel-00615426.
Повний текст джерелаDeprés, David. "Analyse physique et modélisation des instationnarités dans les écoulements d'arrière-corps transsoniques." Aix-Marseille 2, 2003. http://www.theses.fr/2003AIX22091.
Повний текст джерелаHerichon, Eliam. "Modélisation et simulation du déplacement de corps indéformables dans les écoulements diphasiques." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4768.
Повний текст джерелаThis work deals with modelling and the numerical simulation of the effects of a moving rigid body on a multiphase flow. Here more than one object is moving, or an object is moving in a complex geometry domain. So the reference frame linked to the moving body can't be used. The model is build on a multiphase diffuse interface method with mechanical equilibrium. An advection equation is added. It applies on a Level Set function used to track the moving body. Coupling terms are added to the momentum equation and to the total energy equation. These terms are made of a penalization factor and a velocity relaxation factor. This new method allows to simulate complex cases where can interact high velocity objects, shock waves and liquid / gas interfaces
Chevalier, Laurent. "Modélisation et indexation d'objets 3D à l'aide de superelipsoïdes." Lyon 1, 2004. http://www.theses.fr/2004LYO10093.
Повний текст джерелаAnca, Alexe Iléana. "La modélisation interactive de formes 3D à partir d'esquisses." Toulouse 3, 2005. http://www.theses.fr/2005TOU30192.
Повний текст джерелаA prototyping process always starts with the production of several pencil sketches, which give a better description of the designer's idea before the 3D digital mockup is produced. It would be very challenging to integrate these tools into today's modeling software, in order to combine the sketch simplicity with the powerful 3D capabilities. We explore here the possibilities offered by gestural interface. The user is only provided with a digital pen and a digital tablet for his modeling task. Our approach is based on a double skeleton/3D implicit shape representation. For the implicit representation we propose new functions, and also a new boolean volume composition model. This representation allows modeling of a large topological variety of shapes with an adaptive level of detail and a rich collection of sketch based operations with precise control of the result. The surface is smooth, compact, and has a high class continuity level. The modeling operations are done in interactive time
Ramos, Fabien. "Modélisation et validation d'un système d'information géographique 3D opérationnel." Marne-la-Vallée, 2003. http://www.theses.fr/2003MARN0154.
Повний текст джерелаA huge community of geographical and spatial data users like geologists, militaries, town planners or communication and utilities managers are interested in a Geographical Information System being able to handle the third dimension. Unfortunately, GIS commercial solutions are extremely weak about 3D concern. The purpose of this PhD thesis is to model and implement a 3D GIS prototype, which is able to surpass the simple 3D extrusion of 2D outlines. Our prototype demonstrates that today it is actually possible to deal with true 3D data in a Geographical Information System. The architecture of our prototype is structured on a “Boundary Representation” (B-Rep) geometrical model. This model describes an object as a set of faces, which has the advantage of modeling any kind of forms, even very complex ones. In order to insure a better coherence of data, we have added a “structural” topological layer above the B-Rep geometrical description of the object. A “network” topology is implemented to optimize most of network’s queries inside the application. Finally, the set of geographical data is stored in an extended relational database management system, and a 3D R-Tree spatial index allows a straighter and faster data access. One of the most important contributions of 3D to the geographical information systems lies in the new standing given to visibility computing and to optimal path queries. Our prototype allows to draw visibility maps that take the 3D forms of the terrain and the 3D forms of the geographical objects into account. Those constraints are also considered by our optimal path algorithm, which can be parameterized with visibility maps or with the characteristics of the moving object
Clarke, Richard William Barnes. "Modélisation et inversion de données cinématiques complexes en 3D." Pau, 1997. http://www.theses.fr/1997PAUU3010.
Повний текст джерелаFondevilla, Amélie. "Modélisation 3D d'objets cousus à partir d'un unique croquis." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAM070.
Повний текст джерелаThe efficient creation of virtual 3D content is a major issue in Computer Graphics industry and research. This thesis addresses the modeling of sewed 3D objects such as clothes, shoes or accessories from 2D sketched inputs. While existing related approaches are either based on multi-view inputs or on character dependent interfaces, we propose in this thesis to start from an annotated single-view input in order to create 3D content satisfying geometric constraints that are specific to fabric, such as developability, or fold appearance and distribution. Our goal is to exploit the expressiveness user-drawn sketches to guide the modeling of plausible objects, using a priori geometric knowledge.We first present a single-view reconstruction approach for symmetric piece-wise developable objects from an annotated photo. Using the assumption of mirror-symmetry along with properties of smooth developable surfaces, we propose a system able to lift in 3 the silhouette, borders and seams drawn on the picture and reconstruct the surface of the object. Our method also provides topology information on the object, allowing the computation of 2D patterns for each piece of developable surface, which is necessary for manufacturing.While most of existing sketch-based modeling methods for garments aim at reconstructing border lines drawn on top of a view of the 3D virtual mannequin to be dressed, our approach uses a single 2D sketch as input. Our method first extracts generic features relative to the style of the sketched garment expressed as garment proportions, tight areas, silhouette shapes and folds. In particular, we propose a dedicated approach to extract robustly folds characteristics, even in the case of garment with deep folds leading to partially occluded garment borders. In a second step, we synthesize on a target virtual character a 3D garment surface exhibiting similar style, while adapting to the target pose and morphology that may be drastically different from the one depicted the sketch
Mahieddine, Mohammed. "Modélisation, visualisation et animation d'objets 3D : Approche orientée objets." nice, 1991. http://www.theses.fr/1991NICE4496.
Повний текст джерелаCellier, Fabien. "Modélisation et calcul parallèle pour le Web SIG 3D." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10015/document.
Повний текст джерелаThis thesis focuses on displaying and manipulating 3D models from Geographic Information Systems (GIS) in interactive time directly in a web browser. Its main contributions are the visualization of high resolution 3D terrains, the simplification of irregular meshes on the GPU, and the creation of a new API for performing heavy and effective computing in the browser (parallelism GP/GPU) without compromising safety. The first approach proposed for the visualization of terrain models is built on recent browsers efforts to become a versatile platform. With the new 3D pluginless APIs, we have created a visualization client for terrain models “streamed” through HTTP. It fits perfectly into the current Web-GIS ecosystem (desktop and mobile) by the use of the standard protocols provided by OGC Open Geospatial Consortium. This prototype is part of an industrial partnership between ATOS Wordline and its GIS customer, and particularly the IGN (French National Geographic Institute) with the Geoportail application (http://www.geoportail.gouv.fr) and its mapping APIs. The 3D embedded in browsers brings its own challenges which are different from what we know in heavy applications: restrictions and constraints from JavaScript but also problems of data transfer. These constraints, detailed in the next paragraph, led us to rethink the standard algorithms for 3D visualization to take into account the browser specificities. Thus, we have taken advantage of network latency to dynamically manage the connections between the different parts of the mesh without significantly impacting the rendering speed. Beyond 3D visualization, and even if the JavaScript language allows task parallelism, data parallelism remains absent from Web browsers. This observation, added to the slowness of JavaScript processing, constituted a major obstacle in our goal to define a complete and powerful GIS platform integrated in the browser. That is why we have designed and developed the WebCLWorkers, a GP/GPU Web API for high performance computing that meets the criteria of simplicity and security inherent to the Web. We tried to find a trade-off for a language close to the script but secure and efficient, based on the OpenCL API at runtime. This approach is opposite to the existing ones, which are either based on precompiled code or disregard performances. Our API proposal interested the Mozilla Foundation which asked us to participate in the development of the WebCL standard by integrating the Khronos Group (Mozilla, Samsung, Nokia, Google, AMD, and so on). Exploiting these new computing resources, we then suggested an algorithm for parallel simplification of irregular meshes. While the state of the art was mainly based on regular grids for parallelism (and did not take into account Web browsers restrictions) or on simplification and kd-tree clustering, no solution could allow both parallel simplification and progressive visualization using irregular grids. Our solution is based on a three-step algorithm using implicit priorities and local minima to achieve simplification, and its degree of parallelism is linearly related to the number of points and triangles in the mesh to process. We have proposed in the thesis an innovative approach for 3D WebGIS pluglinless visualization, offering tools that bring to the browser a comfortable GP/GPU computing power, and designing a method for irregular meshes parallel simplification allowing to visualize level of details directly in Web browsers. Based on these initial results, it becomes possible to carry all the rich functionalities of desktop GIS clients to Web browsers, on PC as well as mobile phones and tablets
GILLARD, DIDIER. "Vers l'animation dynamique d'un corps humain virtuel : utilisation de donnees biomedicales 3d." Reims, 1997. http://www.theses.fr/1997REIMS023.
Повний текст джерелаFilbois, Alain. "Contributions à la modélisation automatique d'objets polyédriques 3D : extraction des primitives 3D, facettes et segments." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL075N.
Повний текст джерелаGuilhot-Gaudeffroy, Adrien. "Modélisation et score de complexes protéine-ARN." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112228/document.
Повний текст джерелаMy thesis shows results for the prediction of protein-RNA interactions with machine learning. An international community named CAPRI (Critical Assessment of PRedicted Interactions) regularly assesses in silico methods for the prediction of the interactions between macromolecules. Using blindpredictions within time constraints, protein-protein interactions and more recently protein-RNA interaction prediction techniques are assessed.In a first stage, we worked on curated protein-RNA benchmarks, including 120 3D structures extracted from the non redundant PRIDB (Protein-RNA Interface DataBase). We also tested the protein-RNA prediction method we designed using 40 protein-RNA complexes that were extracted from state-ofthe-art benchmarks and independent from the non redundant PRIDB complexes. Generating candidates identical to the in vivo solution with only a few 3D structures is an issue we tackled by modelling a candidate generation strategy using RNA structure perturbation in the protein-RNAcomplex. Such candidates are either near-native candidates – if they are close enough to the solution– or decoys – if they are too far away. We want to discriminate the near-native candidates from thedecoys. For the evaluation, we performed an original cross-validation process we called leave-”onepdb”-out, where there is one fold per protein-RNA complex and each fold contains the candidates generated using one complex. One of the gold standard approaches participating in the CAPRI experiment as to date is RosettaDock. RosettaDock is originally optimized for protein-proteincomplexes. For the learning step of our scoring function, we adapted and used an evolutionary algorithm called ROGER (ROC-based Genetic LearnER) to learn a logistic function. The results show that our scoring function performs much better than the original RosettaDock scoring function. Thus,we extend RosettaDock to the prediction of protein-RNA interactions. We also evaluated classifier based and metaclassifier-based approaches, which can lead to new improvements with further investigation.In a second stage, we introduced a new way to evaluate candidates using a multi-scale protocol. A candidate is geometrically represented on an atomic level – the most detailed scale – as well as on a coarse-grained level. The coarse-grained level is based on the construction of a Voronoi diagram over the coarse-grained atoms of the 3D structure. Voronoi diagrams already successfully modelled coarsegrained interactions for protein-protein complexes in the past. The idea behind the multi-scale protocolis to first find the interaction patch (epitope) between the protein and the RNA before using the time consuming and yet more precise atomic level. We modelled new scoring terms, as well as new scoring functions to evaluate generated candidates. Results are promising. Reducing the number of parameters involved and optimizing the explicit solvent model may improve the coarse-grained level predictions
Nérot, Agathe. "Modélisation géométrique du corps humain (externe et interne) à partir des données externes." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1133.
Повний текст джерелаDigital human models have become instrumental tools in the analysis of posture and motion in many areas of biomechanics, including ergonomics and clinical settings. These models include a geometric representation of the body surface and an internal linkage composed of rigid segments and joints allowing simulation of human movement. The customization of human models first starts with the adjustment of external anthropometric dimensions, which are then used as input data to the adjustment of internal skeletal segments lengths. While the external data points are more readily measurable using current 3D scanning tools, the scientific challenge is to predict the characteristic points of the internal skeleton from external data only. The Institut de Biomécanique Humaine Georges Charpak (Arts et Métiers ParisTech) has developed 3D reconstruction methods of bone and external envelope from biplanar radiographs obtained from the EOS system (EOS Imaging, Paris), a low radiation dose technology. Using this technology, this work allowed proposing new external-internal statistical relationships to predict points of the longitudinal skeleton, particularly the complete set of spine joint centers, from a database of 80 subjects. The implementation of this work could improve the realism of current digital human models used for biomechanical analysis requiring information of joint center location, such as the estimation of range of motion and joint loading
St-Pierre, Dave. "Modélisation du corps humain par une approche surfacique et étude de sa variabilité." Mémoire, École de technologie supérieure, 2007. http://espace.etsmtl.ca/605/1/ST%2DPIERRE_Dave.pdf.
Повний текст джерелаBelkaloul, Amine. "Modélisation des systèmes multi-corps rigides basée sur la méthode des réseaux virtuels." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27391/27391.pdf.
Повний текст джерелаDieudonné, Walter. "Modélisation turbulente anisotrope en écoulements compressibles et application aux tuyères à arrière-corps." Poitiers, 2000. http://www.theses.fr/2000POIT2305.
Повний текст джерелаBournot, Hervé. "Modélisation numérique de la réduction de traînée d'arrière-corps par injection diphasique additionnelle." Aix-Marseille 1, 2004. http://www.theses.fr/2004AIX11058.
Повний текст джерелаGélard, William. "Modélisation 3D et suivi visuel pour caractériser le phénotype de variétés de tournesol." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30207/document.
Повний текст джерелаThe constant increasing food and energy demand in the world associated to global warming and climate change issues, pushed the researchs in plant breeding to move towards the improvement of crops performance and development of a more sustainable agriculture. To meet these demands, the effort made by the researchers were focused on the development of high-throughput genotyping methods (i.e., the study of genome sequence of plants) and allowed the biologists to indentified the genotypes of a large amount of plants. Moreover, understanding the relationships that link the genotypes (DNA) to the phenotypes (visual characteristics) that evolve according environmental conditions like: light, water, drought, heat, etc. has become a main issue in agricultural research. While the genotyping methods were rapidly improved and automatized during the last decade, the phenotyping methods remain manual, sometimes destructive and non-replicable. The usual phenotyping methods consist to measure certain visual parameters of a plant such as: main stem heigh, number of leaves, leaf initiation angle or leaf area, but more importantly, be able to follow these parameters along the plant growth. Consequently, the number of plants to harvest is very important and the measurements are extremely time-consuming. The emergence and reliability of new technologies in computer vision and robotic have led the researchers to take an interest in them and to seek how they can be used in plant science. The thesis is focused on the design, development and validation of a high-throughput phenotyping method design for sunflower plant with an eye to amplify phenotyping capacities by Agronomists and Geneticists (and later varieties evaluators and seed producers). The aim is to improve, modernize and automatize the current phenotyping methods as a way to help the plant scientists to collect a large amount of data. Motivated by the wish to perform high-throughput plant phenotyping, we propose a 3D approach to automatically extract visual characteristics of sunflower plants grown in pot. First, a 3D point cloud of a plant is acquired with classical Structure-from-Motion techniques. A segmentation step is then proceeded to retrieve the main stem and the leaves. With the intention of following the visual characteristics during the plant growth, especially, the leaf area expansion rate of each leaf, a labelling step relying on the botanical model of a plant is performed to affect them a unique label that will not change over time. Finally, the visual characteristics are extracted and results obtained on sunflower plants demonstrate the efficiency of our method and make it an encouraging step toward high-throughput plant phenotyping
Cornu, Tristan. "Modélisation cinématique discrète de la déformation 3D des bassins sédimentaires." Phd thesis, Université Joseph Fourier (Grenoble), 2001. http://tel.archives-ouvertes.fr/tel-00745624.
Повний текст джерелаGibergues, Natacha. "Modélisation cinématique réversible 3D de structures géologiques plissées et faillées." Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00433804.
Повний текст джерелаMorot, Kevin. "Intégration et modélisation RF des interconnexions 3D pour l’interposeur photonique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT067/document.
Повний текст джерелаThe worldwide growth of telecommunication networks drives an increasing need in terms of bandwidth and computing management. Data processing requires the development of complex system, which combines both heterogeneous functionalities such as numeric calculator, analog functions and memory storage. The original chosen approach is highly innovative in the field of microelectronics as it combines both 3D technologies and process integration for photonic on silicon. High speed signals (25, 40 or 60 Gb/s) are transmitted within the photonic interposer through 3D interconnects that are TSV (Trough-Silicon-Via), µ-bumps (copper connection in-between dies), RDL (Redistribution Line) and bumps (copper connection to the bottom access). Thereby, it is necessary to develop new technologies and new assemblies to interconnect and route efficiently those high speed circuits. Another challenge is to model them precisely for very high frequencies (>50 GHz), exploiting and developing the best characterization solutions in order to optimize the way to implement them. This PhD work will be performed in the frame of a tripartite collaboration and can be divided into four parts: 1. Specification of the key interconnects building-blocks and their associated test structures required to evaluate their performance in the context of a photonic interposer 2. Integration of the RF test circuits in the context of the stack of high speed logic dies over a photonic interposer using the developed 3D interconnects 3. Characterization of the test structures at very high frequency using dedicated characterization technics and extraction of equivalent models. Comparison with electromagnetic simulation 4. Validation of the technological and integration choices. Optimization of the transmission lines for efficient routing applied to 3D photonic structures
Scapolan, Raphaël. "Modélisation électromagnétique 3D d'inducteurs multibrins - Développement d'une méthode intégrale parallélisée." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI049/document.
Повний текст джерелаIn order to enable to use high frequencies in the domain of the industrialinductive heating, the use of multi-wires inductors is considered. But, lossesoccurring into that inductors can be important and strongly depend on their complexinternal geometry. To facilitate the design of lossless multi-wires inductors, it isnecessary to under stand their electromagnetic behavior. In this thesis, we presentthe development of a software of parallel computation intended to the 3D electromagneticmodeling of multi-wires inductors. We describe an original method ofbuilding of the geometry of that inductors. This software is based on an integralmethod in which the meshing of spaces between the wires is unnecessary. The useof parallel computing is one of the great forces of this software. The studies werealized show the impact of the geometry on the behavior of that type of inductor
Grimaud, Richard. "Modélisation du comportement non linéaire d'un composite carbone-carbone 3D." Ecully, Ecole centrale de Lyon, 1992. http://www.theses.fr/1992ECDL0039.
Повний текст джерела