Academic literature on the topic 'Trajectoires de fabrication'
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Journal articles on the topic "Trajectoires de fabrication"
Hallé, Julie, and Eric Passavant. "Le contrôle à distance." Téoros 31, no. 1 (December 5, 2013): 103–14. http://dx.doi.org/10.7202/1020713ar.
Full textSauvin, Thierry, Anne Choquet, Melody Leplat, and Roland de Penanros. "Brest et son passé industriel : enfermement ou ouverture ?" Canadian Journal of Regional Science 43, no. 1 (November 5, 2021): 6–15. http://dx.doi.org/10.7202/1083577ar.
Full textAlmeida, Mike. "L’Office provincial des recherches scientifiques et le développement de la science au Québec, 1937-19601." Revue d'histoire de l'Amérique française 56, no. 2 (December 22, 2003): 185–216. http://dx.doi.org/10.7202/007316ar.
Full textQuéinnec, Jean-Paul. "Dispositif cartographique du son pour une scène sans bord." Recherches sémiotiques 36, no. 1-2 (September 7, 2018): 271–94. http://dx.doi.org/10.7202/1051188ar.
Full textWeiss, Pierre. "La fabrication du regroupement sportif communautaire : Enquête sociologique sur les clubs de football « turcs » en France et en Allemagne." Trajectoires, no. 7 (December 18, 2013). http://dx.doi.org/10.4000/trajectoires.1105.
Full textGranada, Daniel. "La fabrication de la capoeira de Londres: Mestre Sylvia et le LSC." ILUMINURAS 18, no. 43 (April 24, 2017). http://dx.doi.org/10.22456/1984-1191.72876.
Full textAuger, Reginald, and Allison Bain. "Anthropologie et archéologie." Anthropen, 2016. http://dx.doi.org/10.17184/eac.anthropen.030.
Full textDissertations / Theses on the topic "Trajectoires de fabrication"
Ettaieb, Kamel. "Contribution à l'optimisation des stratégies de lagase en fabrication additive LPBF." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN050.
Full textDuring manufacturing by Laser Powder Bed Fusion (LPBF), the achieved temperatures in local areas could generate significant thermal gradients. These gradients lead to the apparition of residual stresses which affect the mechanical characteristics of the part and may cause deformation, as well as micro and macro cracks. In this context, scanning paths play a fundamental role on temperature level and distribution during manufacturing. For that reason, it is necessary to validate the generation of trajectories considering the thermal behaviour induced by this process.The purpose of this PhD thesis is to use an analytical method in order to develop a model that allows a fast and efficient analysis of thermal behaviour, during part manufacturing. Indeed, with a given scanning path, material properties and process parameters, the developed tool performs a temperature simulation at each point of the part, over time and in a fast way, compared to other thermal simulation software. In order to reduce computation time and memory storage used for such a simulation, a set of optimization techniques has been proposed.The developed model has been validated in the case of the Ti6Al4V alloy through a comparison with a finite element thermal simulation obtained by industrial software. Then, the results of this model were compared to experimental results. Once validated, it has been implemented to analyze trajectories commonly used in the literature and industry.In order to reduce thermal gradients and improve part quality, the proposed solution consists in controlling the temperature and size of melt pool. For this purpose, the developed thermal model has been used to modulate the process parameters during manufacturing on the one hand and to develop an adaptive scanning strategy on the other hand
Godineau, Kévin. "Optimisation du pilotage de chaînes opto-mécaniques pour l'exécution de trajectoires en fabrication additive par fusion laser sur lit de poudre." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN019.
Full textIn metal additive manufacturing by laser powder bed fusion, the geometry and mechanical characteristics of the produced parts are generated during the manufacturing process. These two aspects are greatly influenced by the laser spot trajectories, and by the control of the energy provided to the powder locally. The numerical control system, whose purpose is to generate instructions to be sent to actuators, has therefore a significant impact on the quality of the parts produced.This work proposes to study the local impact of the operations carried out in the numerical control on both the trajectories executed and the energy provided to the material. In the literature, few studies have addressed these aspects in additive manufacturing. For this reason, an experimental platform is implemented and used to analyze and better understand the operations currently implemented in industrial numerical controls.First, a mathematical model representative of the machine geometry is established. This model converts the laser spot trajectories into instructions for actuators. The model developed is used to improve the calibration step of the machines. Once the system is calibrated, the instructions sent to the actuators are studied. The various processes carried out in the industrial numerical control are analysed, limitations are highlighted and several proposals for improvements are implemented. All these developments are then used to precisely control the energy supplied to the material in the case of certain trajectories adapted to the process. The scientific developments proposed in these works are all validated experimentally on an additive manufacturing machine or on the test bench developed. The work carried out makes it possible to envisage many perspectives concerning the improvement of the treatments carried out inside the numerical control in additive manufacturing
Pechet, Gatien. "Génération de trajectoires pour la réalisation de pièces de grandes dimensions en fabrication additive par dépôt de fil. : Application au secteur naval." Thesis, Ecole centrale de Nantes, 2020. http://www.theses.fr/2020ECDN0015.
Full textAdditive manufacturing is characterized by the successive addition of layers to obtain the desired part. Among the many existing processes, WAAM (Wire + Arc Additive Manufacturing) is particularly well suited to the manufacturing of large parts. It is characterized by a supply of heat in the form of an electric arc (produced by a welding generator) and a supply of material in the form of wire, allowing it a deposition rate higher than additive manufacturing processes with supply in the form of powder. To allow the commissioning of functional parts, the geometry of the weld beads and the material health must be controlled. This results in a good coupling between the operating parameters and the toolpath. This thesis work will highlight a methodology in the choice of parameters using experimental designs or numerical simulation by finite elements. Thereafter, we will study the simulation of the trajectories on a virtual environment, which makes it possible to predict the behavior of the device. We will show the importance of the concordance of virtual and real environments and will propose rules to control the kinematic redundancy. Finally, a manufacturing methodology for large parts will be developed. Following the identification of areas with geometric complexity, different manufacturing strategies have been proposed and successfully applied. This work will be illustrated by the production of various demonstrators, notably from the naval field. More specifically, a hollow propeller blade was produced by taking advantage of the capabilities of multi-axial toolpath (6 + 2 axes) and by using the methodology developed in this thesis
Jousselin, Baptiste. "Développement d'une méthodologie de génération de trajectoires d'ébauche en usinage 5 axes." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST061.
Full textThe complexity of the parts to be manufactured leads to an indispensable recourse to digital media for trajectory planning such as Computer Aided Manufacturing (CAM) software. However, a real imbalance is noted between the wide range of 5-axis finishing operations currently available in CAM software and the lack of solutions for the roughing sequence, which can though improve the productivity of the overall machining process.This thesis manuscript therefore tackles the development of a simultaneous 5-axis toolpath planning methodology for the roughing sequence. Guiding curves are used to create a geometric path which allows the tool to travel the whole volume to remove, and thus ensure a maximum material removal. Guiding curves are built automatically from the numerical model of the workpiece and implemented algorithms for calculating curve and surface offsets using vector methods or scalar fields. The orientations of the tool along the guiding curves are then determined by a Sequential Quadratic Programming algorithm, according to criteria of productivity, tool behaviour, and surface quality, by searching for a specific parameterization of the guiding curves.The implementation of the 5-axis roughing strategy in the TopSolid CAM software enabled machining tests with toroidal cutter, which allowed the strategy's validation on typical parts of the aerospace industry
Duc, Emmanuel. "Usinage de formes gauche : contribution à l'amélioration de la qualité des trajectoires d'usinage." Cachan, Ecole normale supérieure, 1998. http://www.theses.fr/1998DENS0034.
Full textMuller, Pierre. "Fabrication additive de pièces multimatériaux." Phd thesis, Ecole centrale de nantes - ECN, 2013. http://tel.archives-ouvertes.fr/tel-00918030.
Full textAuthelin, Olivier. "Méthodologie de préparation à la fabrication de composants de grandes dimensions à partir de matériaux polymères thermoplastiques fondus." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0006.
Full textLarge-sized additively manufactured components made of thermoplastic polymer materials has experienced significant growth since the 2010s, the arrival of innovative materials having made possible to achieve a leap forward in terms of intrinsic mechanical properties. Large-scale demonstrators manufacturing, developed within the scientific literature, has highlighted therelevance of this process for the realization of structural (sports equipments, pedestrian bridges) and non-structural (large-dimension molds and tools) applications. Indeed, the advantages of this process are numerous, such as for example personalized components manufacturing or costs and lead times reduction. However, large-scale demonstrators manufacturing scientific obstacles resulting from state-of-the-art analysis emerges:- “trial - error - correction” procedure is costly in time, resources and money. There is no consensus on a generic method that allows large components manufacturing preparation;- issues concerning toolpaths generation in order to comply with specifications and the choice of a suitable manufacturing means must be resolved. Within the framework of this manuscript is developed a preparation methodology for large-sized components manufacturing made from fused thermoplastic polymer materials. It offers preparation for generic manufacturing, based on a set of process specific rules integrating the consideration of the previously mentioned issues. The steps of the methodology are processed chronologically in each chapter of the manuscript in which the specific issues and the solutions put in place to resolve them are explained. A research axis dedicated to components reinforcement from continuous fibers reinforced materials in order to overcome mechanical properties anisotropy, inherent in additive processes based on fused thermoplastic polymer materials is notably developed. Finally, large-scale demonstrators manufacturing makes it possible to highlight the methodology relevance but also the perspectives that can be brought to it
Diourté, Adama. "Génération et optimisation de trajectoire dans la fabrication additive par soudage à l'arc." Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30213.
Full textWire Arc Additive Manufacturing (WAAM) is becoming the primary Additive Manufacturing (AM) technology used to produce medium to large (order of magnitude: 1 m) thin-walled parts at lower cost. To manufacture a part with this technology, the path planning strategy used is 2.5D. This strategy consists in cutting a 3D model into different plane layers parallel to each other. The use of this strategy limits the complexity of the topologies achievable in WAAM, especially those with large variations in curvature. It also implies several start/stop of the arc during its passage from one layer to another, which induces transient phenomena in which the control of energy and material supply is complex. In this thesis, a new manufacturing strategy to reduce the arc start/stop phases to a single cycle is presented. The objective of this strategy, called "Continuous Three-dimensional Path Planning" (CTPP), is to generate a continuous spiral-shaped trajectory for thin parts in a closed loop. An adaptive wire speed coupled with a constant travel speed allows a modulation of the deposition geometry that ensures a continuous supply of energy and material throughout the manufacturing process. The use of the 5-axis strategy coupled with CTPP allows the manufacturing of closed parts with a procedure to determine the optimal closure zone and parts on non-planar substrates useful for adding functionality to an existing structure. Two geometries based on continuous manufacturing with WAAM technology are presented to validate this approach. The manufacturing of these parts with CTPP and several numerical evaluations have shown the reliability of this strategy and its ability to produce new complex shapes with good geometrical restitution, difficult or impossible to achieve today in 2.5D with WAAM technology
Boissier, Mathilde. "Coupling structural optimization and trajectory optimization methods in additive manufacturing." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX084.
Full textThis work investigates path planning optimization for powder bed fusion additive manufacturing processes, and relates them to the design of the built part. The state of the art mainly studies trajectories based on existing patterns and, besides their mechanical evaluation, their relevance has not been related to the object’s shape. We propose in this work a systematic approach to optimize the path without any a priori restriction. The typical optimization problem is to melt the desired structure, without over-heating (to avoid thermally induced residual stresses) and possibly with a minimal path length. The state equation is the heat equation with a source term depending on the scanning path. Two physical 2-d models are proposed, involving temperature constraint: a transient and a steady state one (in which time dependence is removed). Based on shape optimization for the steady state model and control for the transient model, path optimization algorithms are developed. Numerical results are then performed allowing a critical assessment of the choices we made. To increase the path design freedom, we modify the steady state algorithm to introduce path splits. Two methods are compared. In the first one, the source power is added to the optimization variables and an algorithm mixing relaxation-penalization techniques and the control of the total variation is set. In a second method, notion of topological derivative are applied to the path to cleverly remove and add pieces. eventually, in the steady state, we conduct a concurrent optimization of the part’s shape and of the scanning path. This multiphysics optimization problem raises perspectives gathering direct applications and future generalizations
Gauthier, Vladimir. "Conception et modélisation pour le contrôle de trajectoire dans les puces microfluidiques : Application au tri cellulaire par diélectrophorèse." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD066.
Full textThis thesis proposes to integrate the principles of micro-robotics in a lab-on-a-chip in order to improve the performance of cell sorting by dielectrophoresis. Controlling the trajectory of cells in a fluidic chip in real time requires redesigning the chip, modeling it and developing control laws dedicated to real-time control. Concerning the design, this thesis is interested in the compromise existing between the speed of sorting and the problems of cell tracking in real time. An original architecture based on two electrode planes, on the upper and lower faces of the channels, is proposed. Manufacturing processes dedicated to this architecture are developed. In particular, the manufacture of transparent electrodes and the assembly of the two parallel electrode arrays are studied. Concerning the modeling, an analytical formulation of the electric field uncoupling control variables, terms depending on the position of the object and terms depending solely on the geometry of the chip is proposed in order to quickly and accurately calculate the dielectrophoresis force. An analysis of the anisotropy of the friction forces present near the electrodes completes the dynamic modeling of the behavior of the microparticles, and gives rise to a model compatible with real-time control, validated experimentally on artificial objects. Finally, a controller based on optimization techniques and a trajectory planner are proposed for cell sorting. A simulator is developed and highlights the good sorting performance of such a system. All of these methods will control the trajectory of biological cells in sorting chips to improve selectivity and speed
Book chapters on the topic "Trajectoires de fabrication"
D’Amours, Martine. "La fabrication des conditions de travail des travailleurs pauvres:." In Pauvreté au travail, transformations des marchés de l'emploi et trajectoires de résistance, 91–104. Presses de l'Université du Québec, 2021. http://dx.doi.org/10.2307/j.ctv224v0tz.10.
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