Tesi sul tema "Automobiles – Carrosseries – Simulation par ordinateur"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Vedi i top-50 saggi (tesi di laurea o di dottorato) per l'attività di ricerca sul tema "Automobiles – Carrosseries – Simulation par ordinateur".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Vedi le tesi di molte aree scientifiche e compila una bibliografia corretta.
Beck, Léon. "Modélisation et caractérisation de l'endommagement jusqu'à la rupture de l'assemblage structurel soudé par points". Electronic Thesis or Diss., Reims, 2023. http://www.theses.fr/2023REIMS053.
Testo completoIn the automotive industry, the demand for complex and innovative products by customers is growing, which presents development challenges. Simulation allows testing of vehicle structures and components before physical construction, saving time and resources. This innovation allows the automotive industry to advance rapidly and push its boundaries. Mercedes-Benz is a leader in designing durable vehicles. An important part of car design involves digitally modelling the connections between metal sheets in the body structure, which is mainly done through spot welds. The number of spot welds varies from 3000 to more than 5000. Precise spot welds modelling allows accurate sizing of the sheets and spot welds in the early stages, resulting in time and cost savings in a vehicle’s design phase.The latest technical innovations in the simulation and assembly of sheet metal consider various thicknesses and types of materials. Up to day, the company's current model does not include such improvements in the evaluation of spot weld strength. The objective of the present work is, therefore, to develop a better model. The goal is to simulate the robustness of spot welds assemblies, while ascertaining their capacity to endure stresses and calculating failure.A first study has been carried out to explore the various spot weld models used in industry. Numerous models can be classified according to their geometric representations, in particular circular, square and linear models. Each of those representations has its own advantages and disadvantages. The models based on a circular representation stand out when it comes to very precise models. However, their complex representation makes them difficult to integrate into a body-in-white. The two other representations particularly caught our attention: one using hexahedral elements with a specific material map and, respectively, one using bar-type elements with a dedicated search zone for simple integration into the assembly. These two representations present advantages and disadvantages, particularly in terms of independence from the mesh and mechanical behaviour.The idea of this work is to merge the advantages from both these representations A cohesive type element with a hexahedral shape based on the use of 3D Timoshenko beam type formulation defining the height of the weld zone. The developments were carried out on ABAQUS. This method allowed us to obtain an elastic model of our structure to be built up from the four edges, as well as a function for measuring the failure of the spot weld.To calibrate this new element, several test cases have been identified and simulated, including KSII, shear and peel tests. These series of tests aimed to verify the adaptation of the element to configurations of materials and thicknesses. Further simulations with varying mesh sizes set in evidence a phenomenon of mesh dependency, as in the models previously analysed. Therefore, a solution has been developed to include a zone of shell elements around our new element, which reduces the influence of the mesh.This latter process allowed us to calculate our hybrid element on different body-in-whites to validate our model on complex structures. The conducted simulations provided a good representation of reality. Differences are still noticeable in places, which can be explained by the fact that the material map developed with the hybrid model has not been calibrated for all possible combinations.This research represents a notable step forward in spot weld modelling, with promising results for a further application in [the company’s model?]. The creation of a hybrid model that can adapt to different mesh sizes and controls all degrees of freedom is a substantial achievement. Nonetheless, the precision and robustness of spot weld behaviour modelling may be further enhanced for considering an industrial application
Ritter, Xavier Ferraris Guy Berlioz Alain. "Modélisation de la distribution d'un moteur à arbre à cames en tête". Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=ritter.
Testo completoWilk, Olivier. "Simulation du comportement dynamique d'une automobile avec couplage aérodynamique". Châtenay-Malabry, Ecole centrale de Paris, 1993. http://www.theses.fr/1993ECAP0279.
Testo completoLovas, Laszlo Rigal Jean-François Marialigeti Janos. "Etude des relations entre le comportement et la fabrication des synchronisateurs des boîtes de vitesses manuelles". Villeurbanne : Doc'INSA, 2005. http://docinsa.insa-lyon.fr/these/pont.php?id=lovas.
Testo completoBourel, Benjamin. "Calcul multi-domaines et approches multi-échelles pour la simulation numérique de crashs automobiles". Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0133/these.pdf.
Testo completoIn explicit dynamics, structural analysis is often very expensive because of the large number of time steps necessary to the stability of the models. The goal is here to propose an original method, based on the domain decomposition algorithms, in order to reduce the time of calculation. A method of handling unilateral contact between domains was first introduced. This method rests on the superposition of a interface contact (by penalty) and of a link interface; it thus returns the treatment of the inter-domain contact to an internal contact to the domain. In addition, a refinement method was integrated into the multi-domain approach in order to enrich locally and temporarily the mesh during calculation. The method being made particularly unstable by the use of the explicit scheme, the accent was put on the way of rebalancing the solution before the resumption of calculations on the new discretization
Bourel, Benjamin Combescure Alain. "Calcul multi-domaines et approches multi-échelles pour la simulation numérique de crashs automobiles". Villeurbanne : Doc'INSA, 2007. http://docinsa.insa-lyon.fr/these/pont.php?id=bourel.
Testo completoEgot, Stéphane. "Intégration des équipements électroniques dans la modélisation de l'architecture électrique des véhicules automobiles : application à la prédiction de compatibilité électromagnétique dans les phases amont de la conception". Lille 1, 2005. http://www.theses.fr/2005LIL10151.
Testo completoThis thesis deals with the elaboration and the evaluation of an integration methodology of electronic equipment in the EMC modeling of the electrical architecture in the early design phase of a vehicle. The proposed approach is based on dissociating the equipment modeling into two complementary parts involving the car manufacturer and the elctronic supplier. The feasibility of this modeling technique primarily required ton characterize the interaction between the equipment and the car body. Besides, the different factors having an influence on the validity of the model were examined as well as its needed level of precision. The latter issue was considered by taking into account the globality of the system, especially the variability brought by the random bundling of the cable harness. Finally the proposed method was evaluated by comparing statistical measurement and simulation results obtained on a realistic electronic sub-system
Gapin, Arnaud. "Etude expérimentale et modélisation 3D des phénomènes physico-chimiques liés à l'injection d'une solution aqueuse d'urée dans le système de dépollution DeNOx/SCR". Rouen, 2011. http://www.theses.fr/2011ROUES027.
Testo completoThe context within the thesis was carried out is the selective catalytic reduction of nitrogen oxide emissions cars (NOx), called SCR (Selective Catalytic Reduction). It is carried out by direct injection into the exhaust of an aqueous urea solution which offers a favorable selectivity to the NOx. This technology also includes downstream of the injector, a dedicated catalyst that accelerates the kinetics of NOx reduction. As with all processes using a spray, the effectiveness of SCR depends on the characteristics of it. Also the research was focused on the spray with the analysis of the experimental drop size distributions and the simulation of the evolution of the spray. The CFD code does not have an adapted primary atomization model, therefore a method has been proposed. This method is based on the use of a spray drop size distribution measured by a laser diffraction granulometer. For this, an initial drop size distribution model was determined from the Generalized Gamma function with three parameters. This model provides the mathematical drop size distribution of the spray, which reproduces the distribution measured by the particle sizer. The mathematical distribution thus obtained is used as the initial distribution of the spray in the CFD code. The validation of the numerical simulation results was performed by comparing with the experimental drop size distributions. The good agreement between the numerical and the experimental results shows that the mathematical model defined from the experimental drop size distribution has the necessary amount of information on the spray
Ribes, Charles. "Caractérisation par méthode optique des débordements d'eau de pluie sur les vitres latérales d'un véhicule automobile". Poitiers, 2008. http://www.theses.fr/2008POIT2289.
Testo completoOverflow of rain water on side windows of a car leads to a degradation of the driving security and comfort. A lot of wind tunnel studies are necessary to avoid this phenomenon, and further developments of numerical simulation tools are still needed. In this thesis, we study the way rain water flows over the windshield, the A-pillar and the side windows of simplified bluff bodies and realistic cars through wind tunnel tests and numerical simulations. An optical measurement method for liquid film thickness based on induced fluorescence and an experimental protocol for full-scale wind tunnel tests were developed. An experimental data base is build with strictly controlled boundary conditions to study the most important parameters: - overflow zone's geometry (windshield gutter and A-pillar's shape) and its influence on local aerodynamic field and on water draining, - car's velocity, - water fluxes linked to rain intensity, - surface effects influence. A combined analysis of those results with aerodynamic simulations brings to light the main mechanisms of overflow (flow in the gutter and on the A-pillar) and water paths on the side windows. The comparison of the experimental data with results from a one equation surface film model enables to underline the lack of efficiency of this kind of modeling. Then ways of improvement of the simulation process are suggested
Lovas, Laszlo. "Etude des relations entre le comportement et la fabrication des synchronisateurs des boîtes de vitesses manuelles". Lyon, INSA, 2004. http://theses.insa-lyon.fr/publication/2004ISAL0017/these.pdf.
Testo completoSynchronizers allow gear changing in manual gearboxes. Their structure, their behaviour as well as problems of behaviour are presented using the Borg-Warner type synchroniser. Mathematical models of phenomena which can be used for description of the behaviour are collected, and then included in numerical simulation software. Simulation results, compared to measured data on synchronizer test rig, allow explaining reasons of the double bump, key phenomenon for the feel of gear changing. Then, simulations highlight the importance of the dynamical behaviour of the synchronizer. Stick-slip, as a main component of the internal excitation, determines the moment of the end of the indexing phase. Discussion of the results permits to suggest improvements of practical use
Ritter, Xavier. "Modélisation de la distribution d'un moteur à arbre à cames en tête". Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0002/these.pdf.
Testo completoA model of the valve train, for an engine with an overhead camshaft, is made in order to determine at what engine speed an unacceptable valve bounce occurs. This model is validated using tests made on various types of valve train. Comparison between tests and calculations allows defining the most important components for dynamics, and defining the way to develop the model. First, a one degree of freedom model is done. This model is improved by a model of the valve spring, with several mass for each coil, and contacts between coils. The finger follower and the hydraulic lash adjuster are also modelled. This last model is created using a specific test on the hydraulic lash adjuste
Chateauroux, Élodie. "Analyse du mouvement d'accessibilité au poste de conduite d'une automobile en vue de la simulation : cas particulier des personnes âgées". Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0037/these.pdf.
Testo completoThis study takes place in the context of Digital Human models used to test the ergonomics of environments such as automotives in the earliest stages of the design process. Yet, these tools do not take into account the aging of the population. The car ingress and egress motions are particularly problematic for seniors. This thesis aims at analysing car accessibly movements of elderly people in order to 1/ better understand their difficulties and 2/ simulate these motions using a digital human model. Eighteen elderly and 7 young subjects participated in the experiment. Ingress and egress motions were captured for four types of vehicle and discomfort ratings were collected by a questionnaire. As age effects differ from one person to another, the functional capacities were measured using clinical tests to draw a portrait of the abilities of each elderly subject. Results of these tests are used to define 3 groups of people: those who have a functional problem, those with “mediocre” capacities and those who have good capacities. Ingress and egress motions are analysed through the interaction between the subject and the environment in order to define the constraints linked to vehicle design. Two major strategies have been observed for the ingress and egress movements. The strategies “Sit First” and “Two Legs Out” are used by people with functional problems. The strategies “Right Leg First” and “Left Leg First” are the most observed ingress and egress strategies, regardless of functional capacities. These movements are decomposed into phases for which sub-strategies are defined. The interactions between the hands and the environmental seem to play an important role. Compensation mechanisms are observed in the movements of persons with functional problems. The discomfort questionnaires show that elderly subjects face more problems when exiting than when entering a car. Discomfort ratings are influenced by the functional abilities of subjects but the results are very heterogeneous. An explanation would be that these ratings also reflect the preferences of subjects in terms of car accessibility. An external examiner would then better assess the difficulties of elderly people. The captured movements are structured in databases in order to simulate the accessibility movements of elderly using the RPx software
Ait, El Menceur Mohand Ouidir. "Modélisation, analyse et simulation du mouvement d'entrée dans des véhicules automobiles à géométrie variable : application aux mouvements d'entrée des personnes âgées et/ou ayant des déficiences motrices". Valenciennes, 2009. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/9af8c69a-6673-4f19-a631-11a69e374902.
Testo completoThe difficulty from which suffer elderly and/or disabled people when entering or exiting an automobile vehicle can lead them to never use it again. The car manufacturers are conscious of this fact and they are more and more interested in these growing elderly and/or disabled populations prone to locomotor apparatus disorders and in this complex gesture requiring a precise coordination of the human body articular movements. An alternative to understand and predict this movement is to use the digital simulation. Works completed in this thesis fall under this context and concern the kinematic simulation of the vehicle entering movement of a humanoid (constituted of a head, a trunk, a basin and lower limbs) in variably-dimensioned vehicles by using real data resulting from the experimentation. To solve this "complex" problem, we propose a three stage methodological procedure. A first stage carries on the constitution of a base of movements that we name "exploitable" movements which are issued from the experimentation carried out on two variably-dimensioned vehicles. These "exploitable" movements are the result of digital processing applied to the measured entry movements. These processing allow, among others, to adapt the measured joint articulation angles to the humanoid in order to avoid possible collisions with the cockpit which would not have been noted during the experiments. A second stage relates to the automatically analysis and identification of the vehicle entering movement strategies. This stage proceeds in four phases and it allows the identification of 2 entry movement strategies and 6 sub–strategies. A third stage, made up of 4 phases as well, uses the assets resulting from stages 1 and 2 to simulate an entry movement of a subject of the base adopting a given sub-strategy in another vehicle of different geometry. The simulation of the entry movement of the same subject in another vehicle concerns an inverse kinematics problem solved by constrained nonlinear programming. Simulations, implying elderly and/or having prostheses people, make it possible to validate the suggested procedure for the two entry strategies. In spite of the differences with the measured movements, the simulated movements are in conformity with the sub-strategies adopted by the subjects during the experiments. Furthermore, the realized simulations make it possible to explain partly the changes of strategy operated by some subjects, during the experiments, when shifting from one vehicle to another. Finally, simulations on fictitious vehicles show the limits of the developed simulation tool. This work opens several prospects for research as well concerning the improvement of simulation, by considering for example the intra-individual differences of subjects or the dynamics of the movement, as the development of new ergonomic indices in order to consider discomfort associated with the simulated movements
Tartousi, Hadi. "Simulation numérique des compresseurs et des turbines automobiles". Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00675771.
Testo completoPortaz, Christophe. "Contribution à la conception d'un superviseur de Contrôle Global Châssis". Lyon, INSA, 2008. http://www.theses.fr/2008ISAL0112.
Testo completoThe active chassis systems are used to improve the dynamic performance of car, remove the usual compromise of automotive design, offer the adaptability to situations and taxi driving styles. Where two active systems coexist, it combines their actions and make the best of this combination led to Control Global. . The objective of this study is to demonstrate the value of supervision of the actions of active systems (as opposed to the actuators is not communicating with each other or not) and provide tools to improve the performance of all created. After introducing the driving conditions typically used for evaluating the dynamic behavior of a vehicle testing or simulation, we present the active chassis actuators. We put in place the necessary simulation tools to study and evaluate the performance of active systems. When this assessment is done we set up a method of optimizing instructions sent to the actuators using different numerical optimization algorithms. The methods and tools developed in this study allow for further development of the Global Control Chassis propose operating points and distribution of tasks between the actuators, for the development of control laws
Lamouroux, Emmanuel. "Modélisation détaillée des soudures par point et laser pour simuler la rupture des assemblages automobiles". Valenciennes, 2007. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/e4fba432-0b62-47fc-8bc6-dea422c4c10f.
Testo completoDue to their slowness and their high cost, the classical methods of experimental characterization about the welded joints’ stress carrying capacity are unsatisfying for industrial purposes. This work provides, for different materials and several sheet thicknesses, an alternative approach based on the construction and on the validation of a volumic numerical model of spot-welds and Laser welds using the finite element method. Firstly, two methods of welded joint’s mechanical properties’ characterization as well as damage and rupture parameters are presented. Secondly, using the material model of Gurson- Tvergaard-Needleman, the welds’ behaviour under quasi-static and dynamic load cases has been simulated and compared with the experimental results. This comparison showed a satisfying correlation not only for the rupture’s pattern but also for the “force vs. Displacement” curve characteristic of the weld. Finally, using the Laser-weld’s detailed model, two case studies have been realized to estimate respectively the consequence of geometrical and mechanical imperfections on the weld’ stress carrying capacity and to evaluate the “transferability” of mechanical data from a given Laser weld’s geometry to another one
Defransure, Fabien. "Simulation aux grandes échelles de la combustion en charge stratifiée". Châtenay-Malabry, Ecole centrale de Paris, 2004. http://www.theses.fr/2004ECAP0970.
Testo completoN order to reduce greenhouse gas and pollutants emissions, car manufacturers investigate new combustion processes such as stratified load combustion by gasoline direct injection. The engine can work with a globally poor mixture and the flame propagates into an heterogeneous mixture where the equivalence ratio is variable. To answer to the need of physical understanding of flame propagation into such heterogeneous mixture, a Research Action called ``Stratified load combustion" has been created where numerical and experimental actions have been carried out. This work belongs to this research action and is devoted to the modelling of combustion in heterogeneous mixture. It is based on large eddy simulation (LES). The combustion model used is the artificially thickened flame model. This model has been first tested on an academic case of a laminar stratified flame. Because it didn't correctly describe stratified flame propagation, some evolutions of the model have been proposed and provided a better description of the flame propagation and burnt gases composition. All the simulations carried out on the experiments of the Research Action have showed the capacity of the thickened flame model to reproduce specific phenomena of a stratified flame such as the continuation of combustion even though the equivalence ratio met by the flame front is under the poor extinction limit. Moreover, the capacity of the model to naturally take into account pressure effects on flame speed has been exposed. That's why the artificially thickened flame model appears to be a good candidate to describe combustion in engines as well as for stratified load combustion as for homogeneous combustion
Chauveau, Franck Merlen Alain. "Aérodynamique de l'avant-corps d'une Formule 1 approche numérique /". [S.l.] : [s.n.], 2002. http://www.univ-lille1.fr/bustl-grisemine/pdf/extheses/50376-2002-327-328.pdf.
Testo completoChoi, In-Sung. "Simulation des mécanismes complexes en C. M. A. O. . : Étude des non-linéarités de comportement : Application aux boites de transmission de puissance d'hélicoptères". Lyon, INSA, 1993. http://www.theses.fr/1993ISAL0034.
Testo completoThe study of the global behaviour of mechanisms such as helicopter and autombile gearboxes showed that the highly non-linear behaviour of bearings prevents from isolating the bearings from the rest of the structure for a precise study in term of stresses and of displacements. An approach of the modelling of bearings and of their environment with consideration of the deformation of the rings is proposed. This approach, which is based upon the Finite Element Method (FEM), gives real boundary conditions for fine study of components optimizations. It permits to quantify the mutual influence between the bearings and the real environment. The realization of prototypes and of experiences requires delays and costs high. A software with pre- and post-processors (automatic meshing, visualization,. . . ) for CAD adapted to the industrial Design Offices permits to reduce sensibly these constraints and increases the knowledge of the real behaviour of the mechanism
Gagnon, Louis. "Calcul de la résistance aérodynamique d'un véhicule muni de pièces en mouvement". Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27288/27288.pdf.
Testo completoChangenet, Christophe. "Modélisation du comportement thermique des transmissions par engrenages". Lyon, INSA, 2006. http://www.theses.fr/2006ISAL0047.
Testo completoThe objective of the work presented here is to elaborate a numerical model which can predict the thenmal behaviour and the efficiency of power gearing transmission. The thenmal networks method has been used. This method consists in dividing the geared unit into isothenmal elements and connecting these elements by thenmal resistances which depend on the kind of heat transfer encountered (conduction, convection, radiation). Seme elements of the network represent heat sources and the heat generated is linked to power losses which occur in a gearing transmission. The following sources of power lasses are laken into account : friction due to the meshing c gear teeth, lasses in bearings, friction in shaft seals and in gearbox synchronizer sets, losses due to cil churning. As far as cil churning lasses are concerned, a specifie test rig has been used to study this dissipation source and seme original fonmulations are proposed to quantify the heat generated. The originality of the model thal has been developed lies in the nodal decomposition : each element is considered as having a basic shape. Then classical correlations are used to quantify heat transfers, and it allows to simulate the thermal behaviour of any geared unit. A computational program has been designed in order to solve simultaneously power lasses and thermal calculations. Steady-state and transient problems can be solved. Seme measurements have been carried out with Iwo different power trains transmissions : a manual six-speed gearbox and an industrial gear unit. The results of these experiments show thal the numerical model allows to predict with a good accuracy the thermal behaviour and the efficiency
Richert, Julien. "Contribution au développement et à l'optimisation de systèmes de retenue adaptatifs pour l'améloration de la sécurité passive dans le domaine automobile". Valenciennes, 2007. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/80d2e31b-0b99-4d74-b885-5932b37a307a.
Testo completoIn the last years, automotive safety became a major issue for the car manufacturers due to its growing importance in their marketing strategy. This comes on the top of a strong political will to reduce the fatalities due to road accidents. In this perspective, newly developed adaptive restraint systems are in the starting blocks to play an important role. This PhD thesis aims at presenting the design and optimization of an adaptive restraint system using numerical simulation. This study relies on three years of simulations and experiments by the Group Research of Daimler AG in the department Assistance and Safety Systems. The first step of this study was to identify frontal crash as the load case likely to be optimized and then to evaluate the restraint system components to be involved to introduce adaptability in the restraint system. The passenger airbag has been chosen as object to bring the adaptability into the restraint system. Contrary to state-of-the-art restraint systems, the optimization method proposed here focused on the adaptability and not only on the restrain performance. To this aim, an adaptability tensor including load cases enabling the adaptability assessment of a restraint system as well as an adaptability score accounting for its adaptability level have been defined. This thesis intends to introduce adaptability in the restraint system by implementing two distinct principles: the variable damping and the earlier coupling of the occupant. Variable damping has been realized by controlling the gas flowing out of the airbag through adaptive vents which trigger time or exhaust orifice sizes. Self-adaptive vents have also been considered. This method proves profitable when it comes to use all the available distance to stop the occupant. Earlier coupling involves the implementation of an airbag whose shape and volume could be adapted to the crash conditions. This principle shows excellent results with occupants sitting in middle to rear-most seat track positions. A numerical simulation model associating variable damping and earlier coupling has been evaluated according to the adaptability tensor. The simultaneous use of both principles leads to an increase of the performance but above all of the adaptability level of the restraint system. The spread of adaptive restraint systems and especially of variable airbags proved their importance towards the increase of the average safety level of the passenger whatever the crash conditions
Grondin, Olivier. "Modélisation du moteur à allumage par compression dans la perspective du contrôle et du diagnostic". Rouen, 2004. http://www.theses.fr/2004ROUES054.
Testo completoThis thesis has described an investigation into the modelling of compression ignition engine for control and diagnosis purpose. The Diesel engine is the most efficient and clean internal combustion engine due to modern electromechanical actuators. However, pollutant emission regulations are much more stricter, thus, these complex systems need sophisticated and efficient control algorithms to reach very low emission levels. For this task, engine models are required at each step of the control system development : control laws synthesis, simulation and validation. The system under study is a six cylinder direct injection Diesel engine fitted with a turbocharger. The model of this system is based on physical laws for some parts of the engine such as cylinders, manifolds, turbocharger and crank-slider system. In order to reduce computing time we choose to model heat transfer and heat release during combustion using simple empirical correlations. Resulting model has been implemented in the Matlab-Simulink environment and it can predict variables of interest for control purpose with one degree crank angle resolution. The model has been tested numerically and compared with an industrial engine simulation code with good results. Moreover, model output variables are in good agreement with experimental data recorded on a heavy-duty research engine. The engine model has been embedded on a board providing enough computing performances to perform real-time simulations, this will be helpful for “hardware-in-the-loop” simulations. Another part of this study is dedicated to the combustion process modelling using a non linear phenomenological model : the NARMAX model. The goal is to predict the in-cylinder pressure evolution using other measurements available on the engine. The NARMAX model parameters have been identified using input-output data carried out from the experimental engine. Such model is well suited for real-time applications compare to numerically cost effective physical models. First results are promising and demonstrate that non linear “black-box” models can be employed to model the combustion process with the crankshaft speed as main model input
Topenot, Erwann. "Atomisation des jets liquides à cônes creux : paramètres d'influence relatifs à l'injection directe essence". Poitiers, 2002. http://www.theses.fr/2002POIT2265.
Testo completoChauveau, Franck. "Aérodynamique de l'avant-corps d'une Formule 1 : approche numérique". Lille 1, 2002. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2002/50376-2002-327-328.pdf.
Testo completoTaillefet, Thierry. "Combustion en milieu confiné d'un mélange pauvre initiée par un jet de gaz chauds". Poitiers, 1999. http://www.theses.fr/1999POIT2299.
Testo completoHernette, Vincent. "Apport de la modélisation bond graph à la conception d'une suspension active". Ecully, Ecole centrale de Lyon, 1995. http://www.theses.fr/1995ECDL0009.
Testo completoThis work deals with a design procedure allowing the development of active automobile suspensions. Bond graph modeling technics are used to carry out simulations in both the frequency and time domains. The approach presents two different aspect : on the one hand the suspension in broken down into its hierarchical components (quater car diagram, bicycle suspension. . . ) and the chapters are arranged according to this breakdown. On the other hand systematic study of the models is carried outgoing through, first of all, exploratory linear studies followed by more in-depth non-linear studies. The first chapter deals with the specificities of the basic hydraulic suspension. The second chapter is dedicated to the quater car model. Within the framework of a precise activation strategy, control laws are tested through application to increasingly realistic automobile models. The third chapter treats modeling of hydraulic control devices. The flow spool, the valve which supplies liquid to the suspension jack, is first covered. Secondly design of an accelerometer sensor according to the principals of a pressure spool is investigated. The fourth chapter deals with a transversal bicycle suspension model aimed at allowing better control of roll motion (roll-damping). The final section, concerning the results and conclusions, highlights the validity of the design procedure which resulted in the development of several prototypes
Chartrain, Didier. "Contribution à l'étude de l'écoulement dans les circuits de refroidissement des moteurs à explosion". Poitiers, 1999. http://www.theses.fr/1999POIT2276.
Testo completoVittecoq, Éric Degallaix Suzanne. "Du crash-test aux essais mono-filamentaires, quelques apports dans le domaine de la caractérisation expérimentale du comportement de matériaux et de structures". Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/163.
Testo completoN° d'ordre (Lille 1) : 424. Synthèse des travaux en français. Recueil de publications non reproduit dans la version électronique. Titre provenant de la page de titre du document numérisé. Bibliogr. à la suite de chaque chapitre. Liste des publications et communications.
Chesnel, Jérémy. "Simulation aux grandes échelles de l'atomisation : application à l'injection automobile". Rouen, 2010. http://www.theses.fr/2010ROUES021.
Testo completoLiquid injection takes an important part in many physical processes, especially within internal combustion engine (ICE). Up to know the Reynolds Averaged Navier-Stokes (RANS) approach has been widely used, both in Eulerian and Lagrangian framework. Several works on atomization have been done in our team developing the ELSA model. However, LES of atomization seems to be a necessarily step forward. In addition to standard LES method for turbulent flows, a special attention is necessarily to represent the interface. Two limit cases have to be considered : - The liquid surface can be well captured with the available mesh size (or filter size) then the LES formulation must recover the DNS methods used to track the interface (such as Level Set or VOF). -The liquid surface wrinkles size are smaller than the mesh size and the two-phase LES formulation must recover the LES used for spray where finally droplets are considered very small by comparison to the mesh size. In this work we present a LES method for two phase flow that can recover these two limits. It is shown that the unresolved SGS (Sub Grid Scale) term that appears in the phase function equation plays an important role, even if it is very small by comparison to the resolved contribution. Application of this method to the atomization of a Diesel jet is presented. LES results are then compared to a DNS data base
Demoucron, Caroline. "Vers la fiabilisation d'un train de suspension automobile : études statique, vibratoire et tenue en fatigue". Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10164/document.
Testo completoThis study deals with the reliability of a car suspension through three aspects namely "static behaviour", "dynamic behaviour" and "life". The static and dynamic behaviours are at first modelled by using finite element method. The behaviour laws of the materials used (steel, elastomer) are experimentally identified. A first subsystem including a spring with its seats is numerically and experimentally studied. A comparison between these results underlines the efficiency of the computational modelling. Then a full car suspension model is created and enables the analysis of the suspension performances with respect to various parameters to be carried out. The last chapter is dedicated to the fatigue life of the main studied elements of the suspension (spring and stabilizer bar). Two numerical processes are used and are compared to experimental results. It is shown that for a sinusoidalload with constant amplitude, both methods yield very close results which are also quite similar to experimental ones. An equivalence between complex random loading and simple constant amplitude loading is investigated through an application to a stabilizer bar
Duval, Fabrice. "Gestion du cablage des masses électriques dans un véhicule automobile : application C.E.M". Paris 11, 2007. http://www.theses.fr/2007PA112291.
Testo completoThis thesis is dealing with the development of a tool for supporting decision on problems related to ElectroMagnetic Compatibility (EMC) in big systems such as motor vehicles. To understand which parameters had to be taken into account in order to get consistent results from the measurements implemented on vehicle was the highest difficulty. We have been focussed on characterising the bundles in vehicles. We have been as well tackling the study of the behaviour of the ground plane linked to very strong electrical direct currents. In order to address these aspects we have been using the PEEC method (PEEC for Partial Element Equivalent Circuit) because of its easy implementation as well as of the possibility of using it for a wide range of frequencies. The report is composed of three chapters. The first one presents the bases of electromagnetism applied to big systems’ EMC. A particular attention is turned to ground planes which are used as return conductor as well as voltage reference. In the second chapter, we present the PEEC method and the methodology which was set up for developing the software in order to obtain the best performances possible. This software has been validated on a set of test cases. The tool’s application to an industrial case is dealt with in the last chapter and enables to understand the phenomena of resonance created by the different elements connected by a bundle. The modelling of the components allows completing the model thus generated
Fresnel, Harold. "Mise en place d'une méthode d'analyse numérique de la rupture structurale des générateurs de gaz pour airbag en phase de tests destructifs". Lorient, 2008. http://www.theses.fr/2008LORIS100.
Testo completoAirbag inflator functioning is submitted to draconian safety rules for vehicle occupants. In this study, the inflator structure is a thin tube closed at both extremities, crimped and perforated with exit ports for combustion gas release. Prior to manufacturing, the pyrotechnic system undergoes validation (burst) tests. The latter consist in putting inflator combustion chamber under various dynamic pressure ramps until structure failure. This work aims at increasing the efficiency and at reducing validation tests number by using numerical simulation. In this work, we are interested in the numerical description of the dissipative response of the inflator material during the burst test induced by dynamic loading. The failure mode under ductile plastic damage is particularly studied. For obtaining reliable experimental results, a preliminary numerical study is carried out for optimising the geometry of curved samples (machined in thin small diameter tubes) regarding strain and stress fields in the gage length. The experimental campaign shows significant influence of strain hardening, plastic viscosity and ductile damage on inflator material behaviour. The GTN damage-plasticity model is used to describe the combined aforementioned effects, including cavity nucleation and growth laws as well as viscous plasticity potential. Numerical simulations considering the validation burst test problem is performed employing the engineering calculation code ABAQUS. Confrontation of numerical results with experimental ones is encouraging concerning prediction ability of the model
Thomas, Aline. "Etude du comportement électrostatique des peintures en poudre dans l'industrie automobile". Compiègne, 2007. http://www.theses.fr/2007COMP1693.
Testo completoThe study deals with the electrostatic phenomena involved in the industrial application of powder paints in the automotive field. In an industrial scale, a good knowledge of the key parameters that influence the transfer efficiency of particles and the uniformity of the film (back ionisation, appearance. . . ) requires the understanding of charge transfer, spray and deposition of powder. The development of an experimental device allowing the measurement of tribocharges exchanged during the fluidization and conveying steps permits to show the difference of behaviour between two industrial powders. The particle size distribution, the fluidity agent, the powder mass flow rate and the high voltage are the key parameters that influence the performance of the electrostatic spraying. This work also presents some results to undertake a simulation of the process
Andrieu, Guillaume. "Élaboration et application d'une méthode de faisceau équivalent pour l'étude des couplages électromagnétiques sur réseaux de câblages automobiles". Lille 1, 2006. http://www.theses.fr/2006LIL10152.
Testo completoPérisse, Jocelyn. "Etude, conception et réalisation d'une suspension active d'un siège de véhicule routier pour l'amélioration du confort dynamique". Ecully, Ecole centrale de Lyon, 1997. http://www.theses.fr/1997ECDL0042.
Testo completoThis work deals with the study, the design and the realization on an active car seat suspension. It starts from the actual theoretical knowledge of active control of vibrations. In our case, we have applied an "active solution" to improve the comfort of car passenger. The comfort criteria (statical, postural, dynamical) which are now taken into account in the design of actual car seats, have been firstly reviewed. On this basis, we have chosen to develop an optimized suspension to solve the specific problem of vibratory isolation of the passenger
Devaux, Nicolas. "Modélisation des tensions de Reynolds : application au calcul de l'écoulement autour d'automobiles". Poitiers, 1996. http://www.theses.fr/1996POIT2296.
Testo completoBardot, Anne. "Modélisation acoustique basses fréquences de cavités en présence d'absorbants sur parois rigides ou élastiques". Compiègne, 1992. http://www.theses.fr/1992COMP0424.
Testo completoBardot, Anne. "Modélisation acoustique basses fréquences de cavités en présence d'absorbants sur parois rigides ou élastiques". Compiègne, 1992. http://www.theses.fr/1992COMPD424.
Testo completoSoubra, Hassan. "Automatisation de la mesure fonctionnelle COSMIC - ISO 19761 des logiciels temps-réel embarqués, en se basant sur leurs spécifications fonctionnelles". Mémoire, École de technologie supérieure, 2011. http://espace.etsmtl.ca/939/1/SOUBRA_Hassan.pdf.
Testo completoSoubra, Hassan. "Automatisation de la mesure fonctionnelle cosmic -ISO 19761 des logiciels temps-réel embarqués : en se basant sur leurs spécifications fonctionnelles". Mémoire, Versailles-St Quentin en Yvelines, 2011. http://www.theses.fr/2011VERS0040.
Testo completoMore and more automotive services are designed using embedded software, including those related to electrical vehicles as well as multimedia and driving aids. Managing the development costs of embedded software is a major challenge to ensure the competitiveness of Renault. The thesis is part of an industry research project to improve the management of these software development costs. An estimation process based on the use of productivity models of software development allows the management of development costs. The creation of a productivity model is based on the measurement of an attribute of the software, its functional size, and on the data effort provided by the supplier. The industrial problem to be addressed first is the cost estimation of future software development on the basis of their functional requirements modeled with a specific language or modeling tool. By measurement the functional size of its functional requirements using the COSMIC ISO 19761 ISO standard, Renault SAS is able to benchmark, select suppliers to whom it will entrust the development of its software products and negotiate specific development projects. The main purpose of this research project is the automation of the measurement of functional size of reactive, real-time and embedded systems software using their functional requirements, and according to the ISO 19761 COSMIC method
Siemund, Stephan. "Modélisation de pot catalytique trois-voies et validation par expériences sur banc moteur et véhicule". Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL113N.
Testo completoGarcía, Aranda Maria Lucia. "Etude thermomécanique et modélisation numérique de l'emboutissage à chaud de l'Usibor 1500". Paris, ENMP, 2004. http://www.theses.fr/2004ENMP1268.
Testo completoSoyer, Gerald. "Automatisation d'un procédé pour la mesure des efforts engendres par l'utilisation d'un véhicule pour handicapes physiques : métrologie et simulation informatique associées". Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL064N.
Testo completoLachassagne, Laurent. "Développement expérimental et modélisation numérique d'une boucle diphasique à pompage capillaire en environnement gravitaire : application au refroidissement de composants d'électronique de puissance en contexte automobile". Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2010. http://tel.archives-ouvertes.fr/tel-00583612.
Testo completoYahi, Islem. "Modélisation des sources de rayonnement au sein d'un véhicule automobile avec prise en compte de la présence du plan de masse". Rouen, 2009. http://www.theses.fr/2009ROUES043.
Testo completoThe thesis presented here, deals with the problems relating to the field of automotive Electromagnetic Compatibility. The work deals specifically on the development of a simulation tool based on the PEEC (Partial Element Equivalent Circuit) method, dedicated to the cabling problems in automobiles. This simulation tool would also support the vehicle manufacturers in decision-making or designing their products. The manuscript is divided into three parts: the first justifies the choice of using the PEEC method among the other numerical methods. We examine also the frequency characterization of cabling schematics in the presence of a ground plane. In the second part of the thesis, we detail all the contributions to optimize an existing version of this tool on two main aspects : the expansion of its frequency band and the optimization of its execution time. The last part is devoted to two applications : firstly, we show a process related to near-field measurements, on the calibration of measuring probes. The second application deals with a case study of the cabling in an automobile, in which we could exclusively test our simulation tool. The example includes all the proposed developments made so far in order to demonstrate its relevance
Phalippou, Pierre. "Data-enabled, reduced-order simulation of dynamical systems with application to vehicle crash simulation". Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2544.
Testo completoVehicle manufacturers face numerous constraints regarding security, comfort, weight, and fuel consumption when designing new automotive vehicles. Numerical simulation, and more precisely, the finite element method, is extensively used in the process to achieve cost reduction while allowing to test the impact of multiple design parameters on the system behavior. Nevertheless, industrial finite element models of automotive crash are growing prohibitively expensive in computation time, slowing down the design process. Numerous model order reduction methods have been developed in order to speed-up simulations by making use of the humongous amount of collected data and the repetitiveness of computations with slight changes to the design variables. This thesis aims to apply model order reduction methods to finite element simulations of automotive crash, involving material and geometric nonlinearity as well as contact. This project, conducted in close collaboration between the car manufacturer PSA group, the software developer Altair engineering, and the computational mechanics group at the UTC-CNRS joint laboratory Roberval, targets intrusive methods necessitating modifications in the finite element solver source code. Amongst different promising methods reviewed in the state-of-the-art, our work focuses on projection-based reduced order modeling and hyper-reduction. A reduced-basis of global shape functions is built upon relevant data in the online training phase and used online to reduce the model size, enabling the hyper-reduction of internal forces and computational speed-up. The contributions of this thesis concern three aspects of the training phase. Developments of the incremental singular value decomposition allow for a more flexible and faster reduced-basis training. The proposed sparse criterion enables the formation of basis functions subsets with enhanced performances and better correlation between the online training phase approximation error and the actual error in the online reduction phase. An innovative formulation of the hyper-reduction optimization problem involving mixed-integer programming, added constraints on polynomial integration, and volume conservation is suggested for the benchmarking of future heuristic methods. All implementations are performed in the industrial explicit finite element solver Altair Radioss with complete access to the source code. To the author's best knowledge, the implementation of such a method in industrial explicit finite element solver represents a significant differentiator of the present contribution. Implementation specific difficulties relevant to this aspect of the thesis are discussed. Finally, recommendations, as well as perspectives and further developments required for the robust application of the method to industrial numerical simulations of vehicle crash, are given
Yu, Yi. "Cinétique d'auto-inflammation de carburants gazeux à haute pression : étude expérimentale et de modélisation". Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10098/document.
Testo completoThe ignition delay of various gaseous fuel (methane, natural gas, syngas) at low and intermediate temperatures (800 to 1010K) and high pressure (0,5 to 2,5 MPa) were measured in the rapid compression machine of the University of Lille 1. Different amounts of hydrogen or additives representing a composition type EGR (CO, CO2, H2O) were added to natural gas in ordre to study their influence on the ignition delay. The effect of operating conditions (pressure and temperature) and the equivalence radio of the fuel were also studied. The mechanism GDF-kin® 4 developed by GDF SUEZ has been used to model the experimental results. This mechanism has been improved to reproduce the ignition delay in our conditon. The new mechanism has also been validated with various experimental results from the literatures
Arzur, Fabien. "Développement de simulateurs de cibles pour radars automobiles 77 GHz". Thesis, Brest, 2017. http://www.theses.fr/2017BRES0082.
Testo completoThe work presented in this thesis concerns the development of an automotive radar target simulator for 77 GHz radar sensors. In order to continue offering safer vehicles, manufacturers develop more and more performant ADAS systems. We are witnessing a democratization of automotive radar sensors for adaptive cruise control and collision warning. The generalization of such systems on standard cars will require an increased use of test devices both at the manufacturers and in technical control centers. To test and calibrate radars, it is necessary to use Radar Target Simulators (RTS). These devices enable to simulate situations encountered by the radar. Furthermore, these scenarios are becoming increasingly complex with the arrival of autonomous vehicles. A target is defined by three parameters: distance, velocity and radar cross-section (RCS). In order to meet drastic requirements, ZF TRW Autocruise develops its own RTS for production test benches and R&D. RTS must adapt to all radars within a 76 – 81 GHz frequency band, with different modulations and a frequency bandwidth higher than 800 MHz. The system must present the advantages of being a low-cost system, with small dimensions and flexible to be integrated in different applications. The major blocking point is the design of a reconfigurable delay line, able to simulate distances between 1 m and 250 m with a resolution of 0.2 m on a large frequency band and also allowing control of RCS. A compromise will have to be found in order to meet the different specifications. The study showed the impossibility to cover the entire range of distances with one single technology. A hybrid architecture is necessary. A hybrid, tunable, wideband delay line is at study
Vincent, Morgan. "Méthodologie de modélisation et de simulation numérique pour l'optimisation en compatibilité électromagnétique du blindage des chaines de traction électrique automobiles". Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR001.
Testo completoTo reach the increasingly stringent regulatory requirements for CO2 emissions, the automotive industry is improving the electric powertrains in car bodies with composite materials. In this thesis report, the point of view of the car manufacturer is considered. The electromagnetic shielding is one of the most important design solutions to respect the electromagnetic compatibility (EMC) requirements for the homologation and the protection of human health with respect to electrical and magnetic fields. In order to evaluate the best concepts at lower costand to minimize prototyping delays, modeling and numerical simulation still need to be developed and deployed.The chapters of this thesis report illustrate, step by step, the modeling, the simulation and the experimentalvalidation of the shielding applied to an electric powertrain. In a first step, the influence of a composite material such as the carbon fiber reinforced epoxy is studied on the conducted and the radiated emissions in presence of a shielded cable. In a second step, a methodology to model shielded cables and the grounding connectionsis proposed in an electromagnetic environment where classical transmission line theory cannot be applied. Tovalidate the two previous parts, measurement setups are proposed and developed. The experimental results arecompared with the numerical simulation. The last part considers a simplified electric powertrain with metal housings, shielded power cables, shielding connections and grounding connections in a multi-material structurein the 10 kHz - 300 MHz frequency band. The conducted and radiated emissions are analyzed with a particular attention to the disturbance of the radio reception