Dissertations / Theses on the topic 'Machines – Pièces – Conception et construction'
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Paredes, Manuel. "Developpement d'outils d'assistance a la conception optimale des liaisons elastiques par ressorts." Toulouse, INSA, 2000. https://tel.archives-ouvertes.fr/tel-00255988.
Full textBouassida, Slim. "Développement de techniques de pressage de poudre en alliage d'aluminium." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28177/28177.pdf.
Full textJunker, Nicolas. "Conception et dimensionnement de pièces de robinetterie en matériaux composites." Paris, ENMP, 2001. http://www.theses.fr/2001ENMP1053.
Full textSalloum, Tammam. "Conception et réalisation de pièces prototypes fonctionnelles en usinage sur machines-outils à commande numérique 5 axes." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00442664.
Full textAladad. "Conception du système de fabrication de pièces mécaniques en grand série : formalisation de la configuration géométrique (enveloppe) et cinématique de Machine-Outil Reconfigurable (MOR." Paris, ENSAM, 2009. http://www.theses.fr/2008ENAM0012.
Full textToday all industrial sectors are subjected to an upward economic pressure and the international competition from the market globalization. To answer in this irrefutable fact, the companies are required to innovate and improve the cycle of product development and/or process from the idea to the product marketing. The fast changes in parts for existing products and competition have led the industrial companies to take an additional step by imagining new manufacturing systems to ensure simultaneously a high productivity and a high flexibility with additional constraints of rapid changes of the part family. This emergence of the “reconfigurability” we can date from the beginning of the year 1990. However, it is necessary today to show a very great reactivity, to be able to answer quickly the appearance of a new product and/or a new demand (fluctuation of volume) in order to stay competitive. The purpose of this paper is to propose and to validate a design methodology of the new paradigm concerning the “Reconfigurable Machine Tools” (RMT), which are one of the answers, faced with fluctuations of demands (frequent market changes), quickly and cost effective by taking into account the increasing alternatives (variability in terms of functionality and volume). The characteristic of this type of machine in relation to other conventional types lies in the upgrading capability in terms of the capacity and/or flexibility and to carry out simultaneously several operations using spindles actuating simultaneously. The field concerned this work is defined for the manufacturing of workpieces using the technology of prismatic machining (milling, axial operations…) based on different concepts of visibility, accessibility and machining features
Bouzgarrou, Belhassen Chedi. "Conception et modélisation d'une machine-outil à architecture hybride pour l'UTGV." Clermont-Ferrand 2, 2001. http://www.theses.fr/2001CLF21325.
Full textSfalcin, Alain. "Contribution d'une approche sémiotique à la réutilisation des composants de commande des machines et systèmes automatisés de production." Nancy 1, 1992. http://www.theses.fr/1992NAN10128.
Full textBartoux, Benoît. "Assemblage par la mesure et assemblage simultané à N éléments." Amiens, 2009. http://www.theses.fr/2009AMIE0114.
Full textThis thesis is concerned with the industrial problem of the measuring assembly process, and more precisely with the simultaneous assembly of N elements. The production in aeronautics deserves a great quality for processes. Hence we need a continuous improvement both for measuring tools (laser trackers for instance), either for algorithms devoted to proceed to the measures. The usual softwares do not take into account the whole panel of tolerances. The drawbacks are a loss of quality which is not suitable for the quality for the quality of the new planes. Our algorithm allows us to take into account these constraints. To begin with, we describe the framework to model the industrial problem. In the second part, we introduce the algorithms developed during this thesis. Eventually we detail these methods on “toy cases” suggested by the quality service of AIRBUS Méaulte and we will apply them on a real case: the assembly problem of the section 12 of the A380
Chebak, Ahmed. "Modélisation, conception et optimisation des machines sans encoches à aimants permanents à haute vitesse." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29808/29808.pdf.
Full textThis research work presents the development of a design methodology with global optimization of high-speed permanent-magnet slotless synchronous machines using soft magnetic composite materials (SMC) in the stator and retaining sleeves in the rotor that can be conductive. This methodology takes into account the different constraints imposed by the high speed such as the eddy currents induced in the massive parts, the losses, the converter-machine interactions and the mechanical stress in rotor. A generic design tool is developed for different slotless machines structures used as motors or generators and coupled to different kind of static power converters with voltage or current commutation. It uses a design model based on analytical prediction of the two-dimensional magnetic field by a harmonic resolution of Maxwell equations taking into account the eddy currents induced in the conductive parts. This model includes an equivalent electric model of the converter-machine system and a detailed losses calculation model validated by 2D finite element analysis. Experimental validation of magnetic losses in the SMC stator is also performed. The design model is associated to an optimization procedure and an iterative correction mechanism performed by 3D finite element simulations to take into account the influence of end-effects on the SMC stator eddy current losses. When the machine is coupled to a current static converter, another correction mechanism is used in order to resolve the strong coupling between the machine and its converter. The developed modeling and design tools are used to design and compare different slotless machines topologies for specific requirements. Various feasibility and sensitivity studies are also performed.
Javadi, Hamid. "Développement d'outils informatiques pour aider à la conception des machines à forte discrétion vibratoire." Toulouse, INPT, 1994. http://www.theses.fr/1994INPT113H.
Full textRisicato, Jean-Vincent. "Optimisation de l'architecture des fils dans une structure textile 3D pour le renforcement de pièces composites." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10070/document.
Full textThe RaidOUTILS project aims the production of textile reinforcement for composite parts. Manufacturing of stiffeners with constant, as well as variable, cross sectional shape is possible. Interlacing is possible trough the thickness of the material and leads to a wide range of fibre orientation within the textile reinforcement. The RaidOUTILS technology is a hybridisation of braiding and weaving manufacturing. By combining properties from both technologies, steps such as cutting, joining and forming can be avoid. Those steps introduce defect in traditional reinforcement manufacturing cycle. Based on independent motion for each yarn within the structure it is possible to control interlacing and modify cross section. Modelling is also proposed for this process. It represents the yarn kinematic based on the existing machinery. The simple model is necessary to have a low calculation time to get the virtual skeleton of the structure. This skeleton returns data such as interlacing, orientation of the preform. The aim of the project is the creation of a new 3D textile manufacturing process and also to make the link between a product (textile) and the process by modelling
Paris, Henri. "Contribution à la conception automatique des gammes d'usinage : le problème du posage et du bridage des pièces." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10204.
Full textBelloy, Philippe. "Intégration de connaissances métier dans la conception : un modèle pour les pièces mécaniques : application à l'usinage et à l'estampage." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10219.
Full textBelut, Emmanuel. "Étude des écoulements d'air et de particules au voisinage de pièces en mouvement :application à la conception des captages sur machines tournantes réalisant des opérations d'usinage." Phd thesis, Université Henri Poincaré - Nancy I, 2006. http://tel.archives-ouvertes.fr/tel-00120447.
Full textLa recherche des modèles numériques les mieux adaptés aux écoulements rencontrés s'est conduite en deux étapes. Sur la base de recherches bibliographiques et d'expérimentations numériques, la première étape démontre l'intérêt et la faisabilité de la simulation des grandes échelles sous-résolue en paroi (ou VLES pour Very Large Eddy Simulation), couplée au suivi lagrangien de particules, pour modéliser les écoulements diphasiques d'usinage, et rendre compte finement de l'interaction particules-turbulence.
Dans la seconde étape, une importante campagne expérimentale, menée sur un banc d'essai original représentatif d'une opération d'usinage, sert de base pour valider définitivement les modèles retenus. Dans le dispositif réalisé, un jet de particules stable et de débit contrôlé est créé en poussant dans une buse des microbilles de verres sphériques contre un cylindre en rotation. L'écoulement de la phase particulaire dans le banc d'essai est caractérisé par analyseur de particules phase Doppler (PDPA), et le champ de vitesse de la phase gazeuse par vélocimétrie par image de particules (PIV), cette dernière technique nécessitant le développement d'un code spécifique pour discriminer les phases en présence.
La comparaison des mesures et des résultats de simulation ouvre des perspectives nouvelles concernant l'applicabilité industrielle de la simulation des grandes échelles aux écoulements multiphasiques.
Belut, Emmanuel. "Etude des écoulements d'air et de particules au voisinage de pièces en mouvement : application à la conception des captages sur machines tournantes réalisant des opérations d'usinage." Nancy 1, 2006. http://docnum.univ-lorraine.fr/public/SCD_T_2006_0121_BELUT.pdf.
Full textThe aim of this work is to contribute to the development of a new design method for close capture exhaust systems for machining pollutants, based on the numerical simulation of particles-laden airflows induced by rotating tools. Firstly, using numerical experiments and bibliography, we demonstrate the feasibility and interest of using large eddy simulation, coarsely resolved in the near-wall region (or VLES standing for Very Large Eddy Simulation), coupled with lagrangian tracking of particles, to model machining induced two-phase flows, and accurately reproduce particles-turbulence interaction. Secondly, we definitively validate the selected models using the extensive experimental data collected on an original test-rig, recreating a pseudo machining operation. In this experimental device, a stable particle stream with a controlled flow rate is obtained by pushing spherical glass particles in a pipe against a rotating cylinder. The jet of particles in the test-rig is characterized using phase Doppler particles analyser (PDPA), and the airflow properties are measured thanks to particle image velocimetry (PIV), this last technique requiring the development of a specific code in order to discriminate the two phases involved. The comparison between measurements and simulations opens new prospects concerning the industrial use of large eddy simulation applied to multiphase flows
Babanezhad, Kaveh. "Inspection géométrique des pièces flexibles sans gabarit de conformation." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI023.
Full textIn manufacturing, quality control (QC) is an essential phase of a product’s lifecycle management (PLM) as it ensures customers receive parts within permissible tolerance ranges and free from defects. Given that all manufactured parts often have geometrical differences compared to their nominal computer-aided design (CAD) models, performing geometrical inspections becomes critical during the QC phase. Nowadays, actual measurements and defect identification during geometrical inspections have been semi-automated through the use of computer-aided inspection (CAI) software. Such software can simplify the inspection into a data acquisition task (contact-based probing or non-contact scanning of the part) followed by semi-automated procedures in a software environment. Despite their growing popularity and practicality, currently available CAI software assume the input acquired data are from a rigid part. This assumption is a major limitation given that not all manufactured parts are rigid, and in some sectors such as the aeronautical industries a considerable percentage of all manufactured components (35 to 40 percent) possess some nonrigid behavior. In other words, CAI software can only be used when a part maintains its shape in both free-state and state-of-use positions. Free-state shape is that which a part has without inspection fixture support and/or before assembly, whilst state-of-use shape is that which is defined in the nominal CAD. Although free-state and state-of-use positions are the same for rigid parts, some mechanical parts such as sheet metals and skins (thin-wall featured parts) often have significantly large geometric deviations in a free-state position compared to their nominal CAD models due to the effects of gravity and residual stress. Referring to such parts as flexible, the aforementioned deviations force the QC technicians to traditionally use a variety of inspection fixtures and conformation jigs in order to maintain flexible parts in their state-of-use position before using conventional CAI software. Without fixation, the free-state elastic geometric deviation of flexible parts would be mistaken by CAI software as plastic deformations and as a result identified as defects. With fixation, the aforementioned free-state deviations are removed before data acquisition, and whatever deviations remain can be inspected as potential defects. However, multiple disadvantages exist in using fixtures including: time consuming set-up process (e.g. 60+ hours for a skin panel in the aerospace industry), considerable purchase and operating expenses, limitations of standard fixture kits in some scenarios, big errors in CAI analysis if fixation has not been conducted correctly, etc. Such disadvantages have recently led researchers to:1) try to circumvent use of fixtures by digitally deforming (or better called registering) the acquired free-state pointcloud/mesh data of a flexible part until it superimposes onto the part’s corresponding nominal CAD model, thereby elastically deforming the data to obtain an optimal state-of-use shape whilst avoiding neutralization of any existing manufacturing defects2) and to try to introduce dedicated defect identification modules with higher degrees of automation (compared to conventional semi-automated CAI tools)In this thesis the same two goals are pursued. A bi-criterion registration method (and two algorithms/demos based upon it) is proposed to achieve the first goal, thereby enabling defect identification of flexible parts in conventional CAI software without the use of fixtures. This is followed by introducing an automated method for fast approximation of defect amplitudes (and an algorithm/demo based upon it) to achieve the second goal. Validation was conducted against a number of virtual (simulated) and experimental industrial case studies. Obtained satisfactory results reflect the effectiveness and utility of the proposed methods
Boivin, Guillaume. "Conception de l'axe principal d'une machine à mesurer les coordonnées." Master's thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19473.
Full textDe, Lara Jayme Salvador Carlos. "Identification des paramètres des machines électriques à courant alternatif." Toulouse, INPT, 1995. http://www.theses.fr/1995INPT009H.
Full textAbo, Al-Kheer Abd Al-Kareem. "Intégration des concepts d’optimisation et de fiabilité dans la conception des machines agricoles." Thesis, Rouen, INSA, 2010. http://www.theses.fr/2010ISAM0024/document.
Full textAgricultural machines should be designed to be optimal, reliable and have thecapacity to resist failure by fatigue. Although, the deterministic design approach does not guarantee these requirements, it is traditionally applied in the design of agricultural machines. This is due to the difficulties to model the stochastic nature of the forces acting on agricultural machines, especially the forces acting on tillage machines which work in irregular environment and under varying conditions. Therefore, the main objective of this dissertation is to develop a general framework for the design of agricultural machines by integrating the optimization, the reliability and the fatigue tools. We aim to provide an alternative to the traditional deterministic design one. First, this dissertation proposes methods and models for modeling the variability in tillage forces considering both thevariability in tillage system parameters and the soil failure. Second, based on the available methods in reliability-based design optimization and fatigue analysis approaches, itproposes methodologies for the design of agricultural machines. Throughout the dissertation, the developed approaches are applied to the design of the shack of a chisel plough
François, Vincent. "Méthodes de maillage et de remaillage automatiques appliquées à la modification de modèle dans le contexte de l'ingenierie simultanée." Nancy 1, 1998. http://docnum.univ-lorraine.fr/public/SCD_T_1998_0243_FRANCOIS.pdf.
Full textEscande, Eric. "Modélisation "objet" du processus de conception dans le domaine du génie électrique : application au cas de la machine asynchrone, le système OPUS." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0197.
Full textThis work aims at carrying out a software for the design in the field of electrical engineering. The analysis of the design activity and the specifications required for our software (such as management of loop-back, capitalization of knowledge, maintenance of the software by the expert) has led us to bring out a generic model of knowledge dealing with : the product to be made, the expert valuation rules and the strategy of solving. This model was developped with expert system and black-board technics, and with object oriented structuration that ensures its evolving and its extensibility. Ln order to take static or dynamic data related to the product and to the strategy into account graphs of classes and graphs of meta-classes were defined in the model. A reasonning basic cycle and the expert rules compilation specify how these data have an interactive influence on themselves and ensuring the upholding of the coherence. This model has been implemented to obtain the cc OPUS» software for the design of high power induction machines
Krebs, Guillaume. "Étude, conception et réalisation d'un actionneur électromagnétique à mouvements linéaire et rotatif." Lille 1, 2007. http://www.theses.fr/2007LIL10155.
Full textBenkahoul, Abdelkader. "Prise en compte de l'ambiance dans la conception des projets architecturaux." Paris 8, 2004. http://www.theses.fr/2004PA082537.
Full textWurtz, Frédéric. "Une nouvelle approche pour la conception sous contraintes de machines électriques." Grenoble INPG, 1996. https://tel.archives-ouvertes.fr/tel-00729068.
Full textThe aim of this work is to define and to present a new approach to the design with constraints of electrical devices. It gives to electrical engineers and searchers the opportunity to use computers not only as analysis tools but also as tools that have real capabilities to make automatic designs. This approach offers great advantages like the ability: -to take into account constraints on the specifications of the device, -to take into account the interdependence of all the physical phenomenon that occur, - to find optimal solutions. However its main originality is that it automatically generates the design software by using techniques of symbolic calculation and automatic programming. For this an analytical model of the device is used as basic knowledge. For the design process, constrained optimisation algorithms are used. In this work, the approach is particularly used for the design of induction machines
Kirouac, Mathieu. "Développement de modèles analytiques thermiques pour des machines à aimants permanents." Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26232.
Full textCe mémoire porte sur le développement d’une modélisation thermique avec des modèles analytiques, pour la conception de machines électriques. Il concerne plus particulièrement les structures de machines cylindriques à aimants permanents. Nous discutons ensuite du modèle thermique complet de type circuit thermique qui a été réalisé et confronté à des résultats expérimentaux. Ce modèle a une très bonne précision et il nous a permis d’étudier l’effet de différentes variations topologiques sur le comportement thermique ainsi que différentes stratégies de refroidissement. Ce modèle peut facilement être intégré dans un processus d’optimisation. En nous basant sur les mêmes principes, nous avons proposé un nouveau modèle à résistances thermiques combinées pour modéliser les échanges thermiques entre les conducteurs dans les encoches. Ce modèle permet d’apprécier le caractère aléatoire de la disposition des conducteurs dans la bobine et peut être jumelé à un modèle plus global.
This thesis focuses on the development of a thermal modeling with analytical models for the design of electrical machines. It concerns more particularly cylindrical machine with permanent magnets. The methods used to determine the critical parameters of thermal modeling are presented first. We then present the complete thermal model that has been developed and confronted with experimental results. This model has very good accuracy and has allowed us to study the effect of different topological variations on the thermal behavior. It was also possible to analyze and compare different cooling strategies. This model can easily be integrated into an optimization process to determine the maximum permissible losses of a given configuration, or to define the cooling method to use. Based on the same principles, we proposed a new model to simulate the thermal exchanges between the conductors in the slots. This model allows us to appreciate the randomness of the arrangement of the conductors in the coil. It can be paired with a more comprehensive model of the machine in order to refine the resolution of the latter and ensure a more accurate analysis of the thermal behavior of the coils.
Derigent, William. "Méthodologie de passage d'un modèle CAO vers un modèle FAO pour des pièces aéronautiques : prototype logiciel dans le cadre du projet USIQUICK." Nancy 1, 2005. http://www.theses.fr/2005NAN10151.
Full textAutomating the CAD/CAM process needs the conversion of the CAD (Computer-Aided Design) model into a CAM (Computer-Aided Manufacturing) model designed to support the tasks associated to manufacturing planning. Our work, conducted within the framework of the RNTL USIQUICK Project, is to propose a conversion methodology in order to obtain a CAM Model dedicated to 5axis aeronautical parts milling. The first part of this document presents a state of the art of the different classical feature recognition methods. It underlines the fact that none of these methods is adapted to aeronautical parts. We then propose to design a specific CAM model directly based on the BRep CAD Model, in which are added information related to the different milling possibilities of the different faces. Every face of the model is then considered as an “elementary” manufacturing feature. To obtain this specific CAM Model, we present in the following our conversion methodology, which is composed of a static view and a dynamic view. The second part of this document presents the static view, i. E. The data model needed for the conversion process, obtained thanks to the VIM (Viewpoint Integration Modelling) methodology. The dynamic view, explained in the third part of this document, adds information related to milling processes that could be used to realize the part. It finally ends to the CAM Model composed of elementary features. In a last part, we propose a software prototype developed for CATIAV5, in order to validate our works. We then present some results of our software on several aeronautical parts
Delma, Ouendpouire Jude. "Étude des matériaux magnétiques composites à particules lamellaires - application à la conception des machines à flux transverse Clawpole à Stator Hybride." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26424/26424.pdf.
Full textCharpentier, Jean-Frédéric. "Modélisation des ensembles convertisseurs statiques-machines électriques par couplage des équations du champ électromagnétique et du circuit électrique." Toulouse, INPT, 1996. http://www.theses.fr/1996INPT065H.
Full textFlasquelle, Aurélie. "Contribution à la modélisation multi-physique : électro-vibro-acoustique et aérothermique de machines de traction." Ecole Centrale de Lille, 2007. http://tel.archives-ouvertes.fr/docs/00/19/65/74/PDF/These-A_FASQUELLE.pdf.
Full textTransports have been developed for past few years. This major development has been followed by growing concern for the environment respect. Although railway transports present high energy efficiency, they also present environmental nuisances. It is then necessary to include the sustainable development from the moment of conception. It results in the consideration of numerous physical phenomena. Consequently, this PhD Thesis aims to emphasize a conception methodology in respect to the current will of economic and ecological optimisation. Then, a multi-physical model has been developed in order to represent electromagnetic, acoustic and thermal-flow phenomena in an enclosed induction motor of railway traction. In fact, this model is divided into several analytical interacting models. Each model represents a specific physical phenomenon. This work focuses on the thermal-flow model and the losses model, and in particular on the modelling of the iron losses. Although these models are analytical models, they both rely on numerical studies. The multi-physical model has shown to be efficient and to respect the main evolution trends thanks to comparison with experimental results and analysis of the uncertainties influence
Ben, Nachouane Ayoub. "Modélisation numérique des phénomènes aérothermiques dans les machines électriques en vue d’optimisation de leur conception : application aux machines électriques des véhicules hybrides et électriques." Thesis, Compiègne, 2017. http://www.theses.fr/2017COMP2348/document.
Full textThe integration of an electrical machine into modern hybrid vehicles is associated with new technical constraints such as the integrability into small volume without losing certainly in performance. Therefore, the development of compacter electrical machines is a well-founded argument for car manufacturers as well as electrical machine designers. On the other hand, this finding assumes that the thermal aspects are undertaken not only during the operation of the electrical machine, but also during the design process. The internal heat generated in different areas impacts strongly the power density and the magnet health which deeply reduce the electrical machine reliability. Heat transfer modeling inside electrical machines is a tricky task because of the strong coupling between the different physics governing their operations. Indeed, the generated losses spread inside the electrical machine through three heat transfer modes which are: conduction (heat diffusion), convection(heat transport) and radiation (heat scattering). In terms of geometry, if a first approach can be carried out by considering only radial heat fluxes, the axially-transferred heat must be undertaken when it is also necessary to consider end caps effects, and particularly the heat released by the bearings. In order to carry out relevantly the thermal analysis of a permanent magnets synchronous machine, CFD based methods are used to characterize the convective heat transfer inside this machine over a large operating range. Both natural and forced convection are analyzed and the corresponding heat transfer coefficients are numerically-estimated. Empirical equations are proposed in order to take into account the coupling between thermal and fluid dynamics inside the cavities of the studied totally-enclosed machine. These correlations are integrated then into a detailed and reduced thermal network. Experimental tests are carried out using a test bench in order to measure temperature distribution in different areas of the electrical machine. Afterward, a comparison between estimated and measured temperatures shows that the results of the numerically-enhanced thermal network are in a good agreement with measurements. Thus, the proposed recommendations based on CFD modeling allow the convective heat transfer to be characterize quickly and precisely. These correlations are useful for upcoming studies dealing with convection inside automotive electrical machines as well as high speed electrical machines
Boudella, Mohamed El Amine. "Etude d’un système hybride de kitting semi-automatisé dans le secteur automobile : conception du système et modèle d’optimisation pour l’affectation des pièces aux pickers." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC057.
Full textIn this thesis, conducted with Renault in the context of a kitting automation project, we are interested in the optimisation of kitting processes in terms of cycle time maximisation. To do so, we study different configurations of hybrid robot-operator kitting systems where robots (two types of robots considered) and operators are connected in series by an intermediate buffer (to decouple their activities). The robotic kitting area starts the preparation of kits then the operators in the manual kitting area retrieve the preparation of robots and complete with the remaining parts.Our objective is to develop a decision-making tool that assesses the hybrid system performance in a given configuration (layout, picking policy, etc.).First, through a modelling of elementary kitting operations performed by robots and operators (pick and place, travel, etc.), we develop a cycle time model to assess the performance of hybrid kitting systems. Then, we develop an assignment model that assigns parts (formulated as a mixed integer linear programming (MILP) problem) either to robotic or manual kitting areas with the objective of minimising cycle times and balancing workload between them. The model is applied to two case studies pertaining to a Renault plant. This analysis identifies the parameters that influence cycle times and the choice between robotic and manual kitting. Finally, we develop a simulation model to find the optimal buffer size between robotic and manual kitting so that throughput is maximised
Lacombe, Alexandra. "Influence du procédé de perçage sur l'intégrité de surface et la tenue en fatigue de pièces percées en AA2024-T351." Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30001.
Full textIn aircraft structures, drilled holes are major critical areas from where fatigue damage can be initiated. Depending on the drilling parameters and process, manufacturers observe significant different fatigue strength of the drilled structures. This thesis aims to give elements for understanding this industrial problem, for the case of AA2024-T351 drilled parts. It deals with industrial drilling configurations and focus on two drilling processes: orbital drilling which offers many potential economic advantages and axial drilling which is the conventional drilling process. The objective of the study is to assess the impact of the drilling configuration on the fatigue strength of the drilled part, but also on surface integrity of the drilled hole. This has to enable to identify the surface integrity parameters controlling the fatigue strength and the major drilling process parameters driving the surface integrity. The first step of the work was to conduct fatigue tests to assess the fatigue performance of different drilling configurations. These revealed significant differences in fatigue life between some drilling configurations. The second step was to lead an experimental characterization of the surface integrity of the drilled holes. This was orientated by a finite element model predicting the material depth affected in the hole subsurface and new analysis methods (like the "HOCT") had to be considered for some aspects of the surface integrity due to the small depth affected. This campaign showed the dominating influence of the internal aspects of the surface integrity (strain hardening and residual stress) on the fatigue strength. Finally, the last step of the work aimed to study the impact of the drilling process parameters on the surface integrity. For this purpose, a finite element model of orthogonal cutting has been developed. The dominating influence of the tool geometry on the surface integrity has been shown
Bruneau, Marina. "Une méthodologie de Reverse Engineering à partir de données hétérogènes pour les pièces et assemblages mécaniques." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2267/document.
Full textThis thesis deals with a methodology of Reverse Engineering (RE) of mechanical assemblies from heterogeneous data in a routine context. This activity consists, from the existing data of a part or an assembly, in rebuilding their digital mock-up. The data used in entrance of our process of RE can be drawings, photos, points clouds or another existing version of the digital mock-up. The proposed approach, called Heterogeneous Data Integration for Reverse Engineering (HDI-RE), is divided into three steps : the segmentation, the signature and the comparison of the initial data with a knowledge database. The signatures of the studied object are compared with the signatures of the same type existing in the database in order to extract components ordered by similarity (distance with the object). The parameterized digital mock-up which is the most similar to the object is then extracted and its parameters identified from the initial data. Data set processing, called "heterogeneous" data, requires a solution which is able to manage on one hand, the heterogeneousness of the data and the information which they contain and on the other hand, the incompleteness of some data which are in link with the noise (into points cloud) or with the technology used to digitize the assembly (ex: scanner or photography)
Mihaila, Vasile. "Nouvelle conception des bobinages statoriques des machines à courant alternatif pour réduire les effets négatifs des dV/dt." Thesis, Artois, 2011. http://www.theses.fr/2011ARTO0212/document.
Full textThe emergence of the concept of a more electric aircraft requires a major overhaul of onboard grid. The main developed axis is based on an increase in the grid voltage and a switch to DC bus. In this context, the onboard electric actuators are supplied through power electronic converters that will impose very fast voltage fronts and particular constraints in the windings of the machines. The transient over-voltages that follow the steep-fronted pulses are the source of intense electric fields which may exceed the partial discharge inception voltage (PDIV) and cause a rapid deterioration of polymer based insulators. This thesis focuses on the study of a new design method of the windings in order to reduce problems of partial discharges. An experimental device developed in this framework reproduces the constraints of modern converters and allows measuring the turn-to-turn voltages of a coil. The experimental study shows the phenomena to be considered with this type of power supply and gives an idea of possible areas for optimization. A predictive model able to give the distribution of turn-to-turn voltages, in response to a steep-fronted voltage, helps to identify critical points. The constitutive parameters of this model were determined using analytical, experimental and numerical methods. Given the complexity of the model, an automated numerical tool has been developed in order to simulate the model of studied coils. Several types of coil have been analyzed and optimized successfully. This optimization consists in reducing the turn-to-turn voltages by acting on the arrangement of the wires in the slots. The use of optimized coils with this method allows envisaging a significantimprovement in the reliability of electrical machines
Locment, Fabrice. "Conception et modélisation d'une machine synchrone à 7 phases à aimants permanents et flux axial : commande vectorielle en modes normal et dégradé." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2006. http://tel.archives-ouvertes.fr/tel-00421765.
Full textAbu, Hanieh Ahmed. "Active isolation and damping of vibrations via stewart platform." Doctoral thesis, Universite Libre de Bruxelles, 2003. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211336.
Full textThe study of single-axis systems has been developed and used to build a six-axis isolator. A six degrees of freedom active isolator based on Stewart platform has been designed manufactured and tested for the purpose of active vibration isolation of sensitive payloads in space applications. This six-axis hexapod is designed according to the cubic configuration; it consists of two triangular parallel plates connected to each other by six active legs orthogonal to each other; each leg consists of a voice coil actuator, a force sensor and two flexible joints. Two different control techniques have been tested to control this isolator :integral force feedback and Lag-Lead compensator, the two techniques are based on force feedback and are applied in a decentralized manner. A micro-gravity parabolic flight test has been clone to test the isolator in micro-gravity environment.
ln the context of this research, another hexapod has been produced ;a generic active damping and precision painting interface based on Stewart platform. This hexapod consists of two parallel plates connected to each other by six active legs configured according to the cubic architecture. Each leg consists of an amplified piezoelectric actuator, a force sensor and two flexible joints. This Stewart platform is addressed to space applications where it aims at controlling the vibrations of space structures while connecting them rigidly. The control technique used here is the decentralized integral force feedback.
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
Bully, Sébastien. "Etude de topographie monastique : l'ancien palais abbatial de Saint-Claude (Jura), Ve-XVIIIe siècles." Besançon, 2008. http://www.theses.fr/2008BESA1002.
Full textThe ancient abbatial palace of Saint-Claude, which underwent a long term dig from 1998 through 2003, has revealed a whole new story behind the ancient abbey founded in the 5th century. The study of the undergrounds and elevations actually led to the discovery of a funeral complex comprised of two chapels, one from the Romanesque period and the other from the late15th c. Which are joined to a long gallery from the 11th c. That linked the two main churches of the monastery, Saint Oyend’s church and the Three Apostles’ church. The exhaustive study of these buildings, which gradually became a part of the cantor’s lodge, then later that of the abbot’s and that of the bishop’s, along with the study of the inhumations, considerably deepen our knowledge of the monastery. In addition to the study and the research carried out on this unique architectural complex, it is the entire topography of the monastery that has been analysed. The dig of the abbatial palace revealed a problem linked to the layout of the burial area which is ultimately linked to the overall design of the monastery. Indeed, in addition to the two churches at either ends of the gallery, true focal point of the monastery, a closer study of the plans and of the documentation have enabled us to confirm the existence of an earlier third church, which stood next to Saint-Oyend’s church. As such, the construction of the gallery at the dawn of the 11th c. Would have strengthened and emphasised the bipolar system, which is thought to date back to the late ancient period. This hypothesis has a wealth of potential for further exploration, as much as from a local point of view as for our knowledge of monasteries in general
Mallard, Vincent. "Définition de machine asynchrone à très haute efficacité énergétique par actions conjuguées du cuivre rotorique et de l'acier à grains orientés." Thesis, Artois, 2018. http://www.theses.fr/2018ARTO0202.
Full textDefinition of high efficiency induction machine using die casting copper squirrel cageand grain oriented steel laminations Nowadays, increasing the efficiency of electrical motorshas become a priority in order to reduce electricity consumption. This thesis dealswith the study of an induction machine composed of a copper squirrel cage realized byhigh pressure die casting and a magnetic circuit made of grain oriented electrical steel(GO) in order to decrease Joule losses and core losses. In the first part, the impact ofthermal shock induced by the die casting copper process on the GO electrical steel wasstudied in order to validate the use of GO in rotor magnetic circuit. The temperatureoccurs during this kind of process has been modeled by 2D and 3D models. An experimentalprocess was realized on the standardize samples in order to make a comparisonwith and without annealing in terms of magnetic properties. In the second part, the newassembly method of magnetic circuit with GO electrical steel has been studied in orderto increase the benefits of use of GO steel in AC machines. The last part, a comparisonbetween several configurations of magnetic circuit in induction machine was realized inorder to confirm the gain of die casting copper rotor with GO electrical steel and GOstator magnetic circuit
Iosif, Vadim. "Conception et mise au point des bobines inorganiques pour des actionneurs électriques capables de travailler aux températures extrêmes." Thesis, Artois, 2016. http://www.theses.fr/2016ARTO0205/document.
Full textThe weak point of electrical machines is the Electrical Insulation System (EIS) of their windings. The best current solutions are based on polymers, they provide lifetimes over 20000h when the temperature at the hottest point of the windings does not exceed 240° C. Consequently, the organic nature of the electric machines EIS represents a technological lock for operating at higher temperatures that have many applications in aeronautics, for designing larger electric generators located near the propulsion turbines of airplanes for instance. The main goal of the research works presented consist in studying the possibility of building the windings of high-temperature electrical machines (HT°) with inorganic EIS which make it possible to work durably at 500°C. The consequences of this technological leap towards high temperatures are analyzed in detail. A large part is devoted to magnetic aspects caused by the presence of a diffusion barrier made of nickel added to the copper wire to avoid oxidation at high temperatures.The first part of the thesis is devoted to the development of a fully inorganic electrical isolation system, which allows to overcome the technological lock due to the presence of polymers in conventional solutions. The second part is devoted to the study of the voltage distribution between the turns of the HT° coil when the machine is powered by a modern electronic converter od aeronautics that imposes very steep voltage fronts
Fedida, Vincent. "Etude des défauts des machines électriques tournantes par analyse du champ magnétique de fuite : Application au diagnostic de machines de faibles puissances dans un contexte de production en grande série." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT023.
Full textDiagnostic and identification of defaults providing in electrical machines (mainly single phased asynchrone motors) by stray flux measurement
Scaringella-Guerritat, Yohann. "Contribution à l'optimisation des propriétés des revêtements utilisés pour la protection des moules en fonderie d'aluminium : Mise en évidence des caractéristiques influant sur la durée de vie et étude de procédés alternatifs pour l'application." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0095.
Full textMontupet is specialized in the manufacture of aluminium foundry components for the automotive industry. The metallic molds used for aluminium cylinder heads are protected by a specific coating called die coating. The main objective of this die coating is to protect the steel tool from chemical corrosion of the liquid alloy. Because of its thermal properties, another of its aims is the adjustment of the thermal exchanges between the mold and the solidifying aluminium, which strongly affects the final microstructure of the alloy. The process used nowadays to coat the die coating on the steel mold walls consists in spraying manually a suspension. However, this process does not allow to obtain reproducible characteristics of the coated layers necessary to control the local solidification gradients. Furthermore, the current tools suffer from the inadequate protection of the die coating, which leads to premature wear resulting in important costs and a decrease of the efficiency of the industrial tool. In the frame of the PROOF project, aiming in the automatisation of the die coating projection, several objectives were set: better know what should be the physico-chemical properties of the die coating and realize a technological jump by creating a long-life or even permanent coating. Firstly, this work shows a complete characterization of the physico-chemical state of the suspensions used nowadays as well as the study of their behavior during spraying. Then, once the coatings were produced by Air Plasma Spraying (APS), it appeared necessary to compare their thermal properties to the ones measured on the die coatings. Hence, thermal diffusivity values have been measured. Afterwards thermal conductivity of the studied coatings have been calculated and finally experimentally checked. Eventually, this work shows the tools developed within the company in order to test the plasma coatings and to check their thermal and chemical compatibility to the process of aluminium casting. These trials in real or semi-real conditions allow the efficiency comparison of the whole studied coatings
Assaad, Bassel. "Contribution à la prise en compte des aspects thermiques des machines électriques dans un environnement mécatronique." Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2251/document.
Full textElectric machines play an important role in power conversion in several applications and fields. With the increasing demand for designing lighter and more efficient machines and optimizing the existing structures, thermal analysis becomes a necessary; in fact, the performance of electric machines islimited by the allowable temperatures in many critical components like windings, permanent magnetsand bearings. Two main approaches can be employed in order to study the machine thermal behavior : the lumped parameter thermal network (LPTN) or numerical models. Considering low-computationtime-consuming and the possibility to be integrated in a mechatronics system design, the LPTN method is considered in our study. The latter is mainly applied on electric machine integrated in a complex mechatronics environment. The thermal network is presented along with the definition of the principal elements constituting this network. In fact, an accurate and reliable network strongly depends on many critical parameters like heat transfer coefficients, interface gaps, impregnation goodness, among others. For this reason, different sensitivity analysis techniques are carried out in order to, first, identify the significance of uncertainties in the evaluation of these parameters on machine temperatures and second, to reduce the thermal network. Next, we propose two optimization algorithm-based identification methodologies in order to calibrate results of the thermal network with measured temperatures obtained from a test-bench of a permanent magnet based integrated starter-generator machine. The calibrated model is then integrated in a mechatronics system consisting of an electric model of the electric machine, along with its control strategy and the power converter. This final study allows us to evaluate the impact of the machine temperature rise on the mechatronic system
Allias, Jean-François. "Dimensionnement d’un actionneur pour organe de pilotage à entraînement direct avec redondance passive magnétique." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/15101/1/Allias_JeanFrancois_INPT.pdf.
Full textRubiano, Fonseca Astrid. "Smart control of a soft robotic hand prosthesis." Thesis, Paris 10, 2016. http://www.theses.fr/2016PA100189/document.
Full textThe target of this thesis disertation is to develop a new Smart control of a soft robotic hand prosthesis for the soft robotic hand prosthesis called ProMain Hand, which is characterized by:(i) flexible interaction with grasped object, (ii) and friendly-intuitive interaction between human and robot hand. Flexible interaction results from the synergies between rigid bodies and soft bodies, and actuation mechanism. The ProMain hand has three fingers, each one is equipped with three phalanges: proximal, medial and distal. The proximal and medial are built with rigid bodies,and the distal is fabricated using a deformable material. The soft distal phalange has a new smart force sensor, which was created with the aim to detect contact and force in the fingertip, facilitating the control of the hand. The friendly intuitive human-hand interaction is developed to facilitate the hand utilization. The human-hand interaction is driven by a controller that uses the superficial electromyographic signals measured in the forearm employing a wearable device. The wearable device called MyoArmband is placed around the forearm near the elbow joint. Based on the signals transmitted by the wearable device, the beginning of the movement is automatically detected, analyzing entropy behavior of the EMG signals through artificial intelligence. Then, three selected grasping gesture are recognized with the following methodology: (i) learning patients entropy patterns from electromyographic signals captured during the execution of selected grasping gesture, (ii) performing a support vector machine classifier, using raw entropy data extracted in real time from electromyographic signals
Merotte, Justin. "Contribution a l'étude des matériaux composites renforcés par des fibres végétales aiguilletées." Thesis, Lorient, 2017. http://www.theses.fr/2017LORIS444.
Full textProposing solutions to produce more efficient and environmentally friendly automotive parts has become a major challenge for tier one suppliers. The work described in this thesis is about understanding and improving composite materials made with commingled plant fibre nonwovens. From the same initial nonwoven, it is possible to obtain very distinct material structures by controlling porosity content. One can then give to the material enhanced acoustic properties with high porosity content (50%) or in the contrary show good mechanical properties by limiting porosities. Material structure will evolve with porosity as well as its mechanical behavior. Thus, as function of porosity, interfacial adhesion of fibre mechanical properties will govern composite mechanical properties. Biocomposite automotive parts are exposed to a large range of climatic environments and their mechanical properties can vary significantly. Indeed, radial stresses are drastically influenced by the reinforcement hygroscopic state. Finally, the idea developing an innovative material structure from compression moulding wastes has helped enhancing material rigidity
Velly, Nicolas. "Contributions à l’étude de machines multi-enroulements pour l’aéronautique : machine synchrone à aimants permanents pour la tolérance aux défauts : machine asynchrone pour la traction." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL022N/document.
Full textThe more electrical aircraft project aims at replacing most of current power generation sources by electrical ones. Consequently this replacement might generate a significant decrease of the fuel consumption. Through this thesis we determine two electrical solutions allowing on the one hand the increase of disponibility level of the actuators and on the other handthe aircraft taxiing by electrical means. We firstly focused on electrical actuators that require electrical redundancy. A first mean to achieve this redundancy is to use two actuators. Nevertheless this solution is not relevant under the reliability constraint because the global failure rate is increased. A double star permanent magnet synchronous motor with concentrated winding is proposed in which a special care was taken to the short circuit current limitation and the magnetic decoupling between the two star winding. We established a semi-analytic model for this kind of motors to predict the amplitude of the resultant of the radial forces acting on the rotor of the machine when operating under normal and faulty operation. We established the model of the machine in order to determine the command strategy. We experimentally validated all of the design principles mentioned above through a prototype designed in the laboratory and built by one of the SAFRAN group company. We secondly investigated on the way to apply the multi winding principles to a brand new project linked to the aircraft taxiing called “green taxiing”. The goal is to obtain a motor topology that allows operating on a wide speed range thanks to the command strategy and the change of its torque coefficient. We established the model of the machine and we compared the results given by this ingenious model to the results given by a finite element resolution using a transient magnetic application
Hatton, Benjamin. "Modélisation d'un procédé de bûcheronnage mécanisé." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22490.
Full textThe research work presented here and realized within the framework of the ECOMEF project - which aims to develop a harvester head more specifically designed to process and fell broad-leaved trees – focuses on the modeling of the cut-to-length logging process, and particularly on the felling and processing (delimbing and bucking) operations. Several models have been developed in order to study the transmission of the feed force to the trunk or the delimbing process. In the same time, different benches have been designed in order to carry out experimental tests that allow a better understanding of the considered phenomenons as well as the experimental characterization of the models’ parameters. Finally, a multi-body dynamic simulation has been developed, in order to study the adaptation of different kinematic architectures of articulated frames to the crooked trunks specific to broad-leaved trees. This simulation contains each analytic model and allow a global study of the phenomenon by considering the interaction between each model
Chakroun, Mahmoud. "Eco-innovation dans le domaine des technologies d'épandage : cas de l'épandeur PROLOG." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-01020876.
Full textBracikowski, Nicolas. "Modélisation multi-physique par modèles à constantes localisées ; application à une machine synchrone à aimants permanents en vue de son dimensionnement." Phd thesis, Ecole Centrale de Lille, 2012. http://tel.archives-ouvertes.fr/tel-00905641.
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