Academic literature on the topic 'Automobiles – Carrosseries – Simulation par ordinateur'
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Dissertations / Theses on the topic "Automobiles – Carrosseries – Simulation par ordinateur":
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.
In 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.
Wilk, Olivier. "Simulation du comportement dynamique d'une automobile avec couplage aérodynamique." Châtenay-Malabry, Ecole centrale de Paris, 1993. http://www.theses.fr/1993ECAP0279.
Lovas, 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.
Bourel, 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.
In 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.
Egot, 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.
This 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.
The 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.
Overflow 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.
Synchronizers 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
Books on the topic "Automobiles – Carrosseries – Simulation par ordinateur":
Rencontres scientifiques de l'IFP (1998 Rueil-Malmaison). La Modélisation multidimensionnelle des écoulements dans les moteurs =: Multidimensional Simulation of Engine Internal Flows : les Rencontres scientifiques de l'IFP, Rueil-Malmaison, 3-4 décembre 1998/December 3-4, 1998. Paris: Éditions Technip, 1999.
Blundell, Michael, and Damian Harty. The Multibody Systems Approach to Vehicle Dynamics. Butterworth-Heinemann, 2004.
Blundell, Michael, and Damian Harty. Multibody Systems Approach to Vehicle Dynamics. Elsevier Science & Technology Books, 2014.
Blundell, Michael, and Damian Harty. Multibody Systems Approach to Vehicle Dynamics. Elsevier Science & Technology Books, 2014.
Kobayashi, Shunsuke, Yasuhiro Ukai, and Shoichi Ishihara. High Quality Liquid Crystal Displays and Smart Devices: Development, Display Applications and Components. Institution of Engineering & Technology, 2019.
Kobayashi, Shunsuke, Yasuhiro Ukai, and Shoichi Ishihara. High Quality Liquid Crystal Displays and Smart Devices: Development, Display Applications and Components, Volume 1. Institution of Engineering & Technology, 2019.