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Дисертації з теми "Automobiles – Industrie et commerce – 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
García, 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.
Barlet, Olivier. "Contribution à l'optimisation de forme de pièces embouties pour l'industrie automobile." Compiègne, 1998. http://www.theses.fr/1998COMP1110.
BOUAMRANI, MOUNA LATIFA. "Contribution à la modélisation de la cristallisation sucrière en vue de la conduite de procédés : comparaison des approches spécifique et généralisée en simulation dynamique." Châtenay-Malabry, Ecole centrale de Paris, 1994. http://www.theses.fr/1994ECAP0356.
Mirade, Pierre-Sylvain. "Contribution à l'amélioration des procédés de traitement des solides par l'air grâce à la description et à la simulation de l'aéraulique ; application au refroidissement et au séchage des viandes." Poitiers, 1996. http://www.theses.fr/1996POIT2268.
Bakiri, Redouane. "Design des services : concepts, pratiques innovantes et maquettage numérique du service après-vente Renault." Paris, ENMP, 2007. http://www.theses.fr/2007ENMP1636.
Value creation and quality strengthening in the automotive industry are no longer limited to supply marketable innovative cars with shortened lead-times but have to be extended gradually to efficient design of associated services such as extended warranties and after sale services. `This thesis defined Service Design as a Concept Service Design, Service Process Design and Production Service Design. It tackles more deeply with the Renault After Sale Service Process Design and proposes a new innovative aided design approach based on Business Process Modelling, flow simulation, CAD and 3D Visualisation in order to foster what-if scenarios and collaboration within all the professionals ( marketers, quality experts, logisticians CAD specialists, IT professionals and top managers). The aim of this « Service Digital Mock up » or « Computer Service Aided design » is to decrease design costs, leverage quality and help define objectives, quality norms ( service time, waiting time, resource workload, dedicated areas and layout) and select mutually the best compromises. Besides, this thesis show how Process Design can impact designing new Services Offers and how Service production with the clients can be described by behavorial simulation. Finally, it characterizes the after sale logistics and define some ways of improvement for the Information System Design
Blondet, Gaëtan. "Système à base de connaissances pour le processus de plan d'expériences numériques." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2363/document.
In order to improve industrial competitiveness, product design relies more and more on numerical tools, such as numerical simulation, to develop better and cheaper products faster. Numerical Design of Experiments (NDOE) are more and more used to include variabilities during simulation processes, to design more robust, reliable and optimized product earlier in the product development process. Nevertheless, a NDOE process may be too expensive to be applied to a complex product, because of the high computational cost of the model and the high number of required experiments. Several methods exist to decrease this computational cost, but they required expert knowledge to be efficiently applied. In addition to that, NDoE process produces a large amount of data which must be managed. The aim of this research is to propose a solution to define, as fast as possible, an efficient NDoE process, which produce as much useful information as possible with a minimal number of simulations, for complex products. The objective is to shorten both process definition and execution steps. A knowledge-based system is proposed, based on a specific ontology and a bayesian network, to capitalise, share and reuse knowledge and data to predict the best NDoE process definition regarding to a new product. This system is validated on a product from automotive industry
Gomes, Samuel. "Contribution de l'analyse de l'activité au processus de conception de produits innovants : application à la conception de systèmes de contrôle-commande automobiles." Vandoeuvre-les-Nancy, INPL, 1999. http://docnum.univ-lorraine.fr/public/INPL_T_1999_GOMES_S.pdf.
Situated in the industrial systems engineering field, this work proposes a reflection on the methods and the tools that can be applied for better designing new products adapted to future users. In this context, a transverse approach is adopted in the field of design methodologies, by using ergonomies and data processing principles. Some difficulties of co-operation between engineers and ergonomicists have been identified for designing new products in view of user activities. In this context, we have formulated several proposals. In addition to our own vision of the product design process, centered on the necessary co-operation between the various actors of the project, we propose a new co-operation tool based on motor activities observed when using the product. First we analyze the various user motor activities of existing products are analyzed using a global vision of the Man-Product-Environment system. Then, it is possible to build different future user activities of the future product by using modeling and simulation methods. The application of these proposals to an in-car radio design project showed the need for developing a new computer aided design tool: MANERCOS. This software is dedicated to real situations using activity analysis, based on video recordings. Thereafter, the same software can be used for modeling and simulating desired future user activities. In accordance with concurrent engineering techniques, the same methods and tools are proposed to evaluate existing production and to design future production means for the future product
Vigneau, Guillaume. "Etude et modélisation d’un système de transmission d’énergie et de données par couplage inductif pour des systèmes électroniques dans l’environnement automobile." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30281.
Nowadays there is a strong demand of systems allowing to transfer energy in a wirelessly way to small electronic devices. So we can well understand the interest of such systems in embedded environments such as vehicle cockpit. The principle of magnetic induction comes from a magnetic flux exchange between two inductive antennas. The magnetic field will be used to transport an electrical power from an emitter to a receiver. These systems using the magnetic induction to transfer energy contain an emitter, inductive antennas (coils) and a receiver. A first chapter will be dedicated to the antennas employed in inductive wireless power transfer systems on theoretical and technological points of views. An electromagnetic modeling of these inductive antennas will be realized and validated through correlation with measurements. Once the modeling process defined and the validations done, it will be used through intensive electromagnetic simulations in order to show the impact of antennas parameters on their electrical and electromagnetic performances. After the inductive antennas characterization and their key parameters identification done, we will study in a second time the magnetic induction effects when emission and reception antennas are placed together in order to realize an inductive power transfer. Notions of magnetic coupling which appears between inductive antennas and magnetic efficiency which characterizes how much quantities of power are transferred will be highlighted. In the same conditions as before, the impact of antennas parameters on the power transfer and magnetic coupling will be investigated through electromagnetic modeling of inductive antennas and the use of intensive electromagnetic simulations. Thus, we will have the opportunity to precisely understand the meaning of the inductive power transfer and the different ways of optimizations. By this way, we will also propose some general design guidelines for antennas employed in inductive wireless power transfer systems. A third chapter will be dedicated to the presentation of the different electronic stages used in inductive wireless power transfer systems. A part of it will be employed on the definitions of the different elements allowing the wireless power transfer on a system approach. The design, optimization and measurement of power amplifiers used on the emission stage will be presented too.. Indeed, it is necessary to have efficient power amplification in order to transfer the required power to different receivers such as phones at the same time to limit the power losses. From circuit modeling of different emitter and receiver and with circuit simulations, we will develop power budgets in order to evaluate the performances and limits of these systems. Once the simulation validated by measurement, we will be able to quantify the total power transfer efficiency and propose optimization ways. Because of the current existence of different inductive wireless power standards on the industrial market for electronic consumer, analogies with them will be done all along the different steps of this thesis in order to highlighted their different functioning principles
Fatfouta, Naouress. "Towards a support system for simulation aided-design in the development phase of automotive industry." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC025.
This research aims to support the simulation-aided design process in the development phase of vehicles. The development phase is supported by modelling and simulation and consists of iteratively refining the design specifications, evaluating the vehicle's performance and solving design issues encountered. We are in a context of simulation-aided design since the decision about the vehicle design is mainly based on simulation. In this thesis research, our focus is mainly on the crash simulation analysis process. The simulation-aided design is knowledge-intensive; it depends heavily on the knowledge of analysts and experts.First, we identify the difficulties and challenges encountered in the design issue resolution process. Therefore, we conduct an empirical study to understand better the simulation-aided design process in use in the company. The industrial challenges have been identified based on a two-level analysis, the analysts' team level and the project level. The challenges include the access and share of knowledge, data consistency, and the formalisation of approaches and the process. The empirical study confirms that knowledge is a key factor for the improvement of the simulation-aided design process.Moreover, we propose an ontology to formalise crucial knowledge for car crash simulation. The ontology we have developed is called the Crash Simulation Post-Processing Ontology. This ontology formalises knowledge related to the post-processing phase of car crash simulation and the interpretation of simulation results. The aim is to formalise knowledge related to the resolution of design issues and the proposal of design changes.Furthermore, the multidisciplinary, highly collaborative and contextual nature of engineering design has raised the need to support integrated and collaborative product development. Successful collaborative engineering design depends on the ability to manage and share engineering knowledge. Therefore, nowadays, knowledge management plays a crucial role in business competitiveness, hence our proposal of an integrated and collaborative ontology-based approach to knowledge management. We develop an ontology-based knowledge management support system with a focus on knowledge retrieval. The architecture of the support system is proposed, and implementation for its evaluation is undertaken. The support-system proposed is proven effective for capturing engineering knowledge, facilitating design-issue resolution and saving analysts' time
Книги з теми "Automobiles – Industrie et commerce – Simulation par ordinateur":
Wentland, Kenneth. Ford flexes back: Changing the U.S. auto industry from deep within the trenches. New York: Strategic Book Pub., 2008.