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Arige, Abhaya Dhathri. "Simplification of 3D CAD models with deep learning for augmented reality". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAS018.
Pełny tekst źródłaAs a part of Industry 4.0 the use of Augmented Reality (AR) devices like HoloLens has gained significant acceptance for training assembly line operators in various industries. When employing Computer-Aided Design (CAD) models to create assembly line instructions for training purposes, preserving all redundant information becomes unnecessary. Utilizing simplified CAD models leads to improved run-time performance of the applications in which they are employed. This specific research project is tasked with developing methods and techniques to streamline complex 3D CAD models, making them suitable for AR applications.In this research, we explain how 3D models play a significant role in augmented reality (AR) by enriching the virtual experience through the superimposition of computer-aided design (CAD models) onto the real world. The study goes on to offer detailed descriptions of numerous applications of AR in operator training. Furthermore, it elucidates how the integration of 3D CAD models contributes to a deeper understanding of instructions and procedures within these training scenarios.We conducted an in-depth literature review in the field of CAD model simplification to determine which simplification techniques are most suitable for integration into augmented reality (AR) scenarios. Our research revealed that mesh-based simplification techniques are particularly effective in preserving the essential features of CAD models while offering the advantages of precise control over the level of detail.Additionally, we have carried out four distinct types of assessments as part of our research. These assessments encompassed objective evaluations that applied mesh-based techniques from existing literature, subjective assessment involving a thorough examination of each simplified model to determine the level of simplification based on vertex ranges, real-world testing conducted with the assistance of the HoloLens2 that demonstrated framerate enhancements when employing simplified CAD models in place of their original versions. To conclude our evaluations, we conducted user assessments, as user experience holds utmost importance in our study. They demonstrated that the simplified models possess a high degree of capability in substituting the original counterparts. However, it was noted that more simplification is required, particularly for intricate CAD models.An innovative approach centered around segmentation and adaptive simplification through the utilization of deep learning methods is proposed as the main methodology. To illustrate this framework, we employed a specific feature called "continuous chains". We subsequently conducted a comparative analysis against established state-of-the-art techniques, demonstrating that our methodology outperforms existing approaches. In our future research, we intend to expand the scope of our framework to encompass multiple features in CAD model
Boussuge, Flavien. "Idéalisation d'assemblages CAO pour l'analyse EF de structures". Phd thesis, Université de Grenoble, 2014. http://tel.archives-ouvertes.fr/tel-01071560.
Pełny tekst źródłaSoderquist, Hans Lars. "Automatic geometric data migration throughout views of a model fidelity family /". Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1184.pdf.
Pełny tekst źródłaZhu, Cheng-Feng. "CAD/CSPP/CAM integration using feature-based component data model". Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362993.
Pełny tekst źródłaCarlson, Shane A. "Development of a Variational Part Model Using In-Process Dimensional Measurement Error". Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1341.pdf.
Pełny tekst źródłaFernando, L. Greshan. "Development of an analytical model for electrochemical machining (ECM) of an axisymmetric disk". Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175884893.
Pełny tekst źródłaPepin, Faustin. "Obrobitelnost kompresních kol z titanových slitin". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230048.
Pełny tekst źródłaElmubarak, Mona Dr. "Accuracy and reliability of traditional measurement techniques for tooth widths and arch perimeter compared to CAD/CAM". The University of the Western Cpae, 2018. http://hdl.handle.net/11394/6472.
Pełny tekst źródłaBACKGROUND: Plaster models form an integral part of the traditional orthodontic records. They are necessary for diagnosis and treatment planning, case presentations as well as for the evaluation of treatment progress. The accuracy of the measurements taken for space assessment is crucial prior to treatment planning. The introduction of digital models overcomes some problems experienced with plaster models. Digital models have shown to be an acceptable alternative for plaster models. AIM: The aim of the study was to determine the accuracy of traditional measurement techniques when compared to the CAD/ CAM measurements in the assessment of tooth widths and arch perimeter from plaster models. METHOD: The mesio-distal tooth widths and arch perimeter of thirty archived plaster models were measured using a digital caliper to the nearest 0.01 mm and divider to the nearest 0.1 mm. Corresponding digital models were produced by scanning them with a CAD/CAM (InEos X5) and space analysis completed by measurements using InEos Blue software. Measurements were repeated after 1 week from the initial measurement. The methods were compared using descriptive analysis (mean difference and standard deviation). RESULTS: The operator reliability was high for digital models as well as the plaster models when the measurement tool was the digital caliper (analyzed using the Pearson correlation coefficient in the paired t-test). The mean values of tooth widths measurements of CAD/CAM, digital caliper and divider were 6.82 (±0.04), 6.94 (± 0.04) and 7.11 (± 0.04). There was a significant difference between the measurements made by the CAD/CAM and the divider. Additionally significant differences between the measurements by digital caliper and divider measurements (p < 0.05) were observed. No significant difference was found when comparing CAD/CAM to digital caliper. Positive correlation was displayed between CAD/CAM, digital caliper and the divider, but the measurements completed with the digital caliper had the highest correlation with the CAD/CAM. The difference was not significant between the aforementioned measurement tools (p > 0.05). Arch perimeter measurements showed no statistical significant difference between CAD/CAM, digital caliper and divider (p < 0.05). CONCLUSION: Archived plaster models stored as records can be converted to digital models as it will have the same accuracy of measurements. The value of doing a space analysis with the CAD/CAM system can be performed with similar reliability on the digital models as a caliper on plaster models.
Tamburini, Diego Romano. "The analyzable product model representation to support design-analysis integration". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17106.
Pełny tekst źródłaElmubarak, Mona. "Accuracy and reliability of traditional measurement techniques for tooth widths and arch perimeter compared to CAD/CAM". University of the Western Cape, 2018. http://hdl.handle.net/11394/6521.
Pełny tekst źródłaBackground: Plaster models form an integral part of the traditional orthodontic records. They are necessary for diagnosis and treatment planning, case presentations as well as for the evaluation of treatment progress. The accuracy of the measurements taken for space assessment is crucial prior to treatment planning. The introduction of digital models overcomes some problems experienced with plaster models. Digital models have shown to be an acceptable alternative for plaster models. Aim: The aim of the study was to determine the accuracy of traditional measurement techniques when compared to the CAD/ CAM measurements in the assessment of tooth widths and arch perimeter from plaster models. Method: The mesio-distal tooth widths and arch perimeter of thirty archived plaster models were measured using a digital caliper to the nearest 0.01 mm and divider to the nearest 0.1 mm. Corresponding digital models were produced by scanning them with a CAD/CAM (InEos X5) and space analysis completed by measurements using InEos Blue software. Measurements were repeated after 1 week from the initial measurement. The methods were compared using descriptive analysis (mean difference and standard deviation). Results: The operator reliability was high for digital models as well as the plaster models when the measurement tool was the digital caliper (analyzed using the Pearson correlation coefficient in the paired t-test). The mean values of tooth widths measurements of CAD/CAM, digital caliper and divider were 6.82 (±0.04), 6.94 (± 0.04) and 7.11 (± 0.04). There was a significant difference between the measurements made by the CAD/CAM and the divider. Additionally significant differences between the measurements by digital caliper and divider measurements (p < 0.05) were observed. No significant difference was found when comparing CAD/CAM to digital caliper. Positive correlation was displayed between CAD/CAM, digital caliper and the divider, but the measurements completed with the digital caliper had the highest correlation with the CAD/CAM. The difference was not significant between the aforementioned measurement tools (p > 0.05). Arch perimeter measurements showed no statistical significant difference between CAD/CAM, digital caliper and divider (p < 0.05). Conclusion: Archived plaster models stored as records can be converted to digital models as it will have the same accuracy of measurements. The value of doing a space analysis with the CAD/CAM system can be performed with similar reliability on the digital models as a caliper on plaster models.
Martin, Pierre. "Modèle pour la conception immersive et intuitive : application à l’industrie automobile". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112144/document.
Pełny tekst źródłaThis thesis addresses the use of Virtual Reality (VR) technologies in the activities of Computer-Aided Design (CAD). More precisely, this research focuses on an approach for direct and interactive modifications of CAD objects, an approach which might be adapted to the conception process in industry. Usually, CAD software requires some skills (experience and knowledge), on the software’s functionalities and representations, as well as on CAD objects (principally on their design history, on the way they were built). Moreover, VR technologies bring new interactive paradigms of 3D interaction, such as immersion and multi-sensorimotor perception stereoscopy, 3D audio, haptics, and so on), and one needs intelligent middleware to manage CAD objects in these immersive Virtual Environments (VE). Some previous work proposed a mechanism allowing implicit edition of CAD objects, from the manipulation of their 3D visual representations. Based on a technique of Boundary Representations (B-Rep) elements labelling, and coupled with an inference engine, this mechanism describes a backward chaining of B-Rep elements towards the operators of a dedicated model of Constructive History Graphs (CHG). However, this approach had a major limitation: since it was based on a specific model of CHG, its integration within commercial CAD softwares used in industry (and especially in automotive industry) was far from obvious. Our first contribution is then to propose a data model and an architecture to generalize this backward chaining mechanism to any of CAD system based on B-Rep and CHG representations. In order to do that, we have designed several encapsulations structures, to manage CHG operators and their parameters, and the B-Rep components. Secondly, the previous labelling, now attached to these structures, has been extended to enable a multi backward chaining. Actually, some B-Rep elements may be the result of several CHG operators, and thus, several decisions may be inferred from their manipulation. These improvements make possible to have direct and interactive modifications of existing CAD objects by parsing their CHG to fill our structures with useful data. Moreover, the multi backward chaining mechanism reinforces the ability of the inference engine to free users, especially non-expert ones, from too complex understandings on CAD models. As a proof of concept of our model, we present an detailed example of our approach on the geometric kernel of CATIA and we show how one can consider new concepts of interaction during immersive project reviews: to allow participants to directly modify CAD objects without any interaction on desktop workstation
Wahlund, Patrik, i Patrik Sjögren. "Studie av informationsöverföring mellan konstruktion och produktion". Thesis, Linköpings universitet, Maskinkonstruktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129317.
Pełny tekst źródłaDetta examensarbete ämnar undersöka hur informationsöverföringen av produktrelaterad data sker i industrin för att kunna ge förbättringsförslag för Linköpings Universitets CAD- och ritteknikskurser. Detta för att kurserna bättre ska spegla industrins nuvarande och även framtida behov. Examensarbetet utfördes på avdelningen maskinkonstruktion vid Linköpings Universitet och är det avslutande momentet på författarnas civilingenjörsutbildning i maskinteknik.Till att börja med utfördes en litteraturstudie. Detta för att ge kunskap inom det aktuella området och vilka metoder som kan användas för datainsamling och analys. För att undersöka hur industrins arbetssätt ser ut utfördes en flerfallstudie på sju olika företag som bedriver produktutveckling tillsammans med egen produktion. Som datainsamlingsmetod valdes semistrukturerade intervjuer med anställda på de olika företagen.Analysen utfördes med hjälp av en adaption av ”affinity diagram technique” vilket delade upp företagens svar i kategorier i form av påståenden. Dessa jämfördes mellan företagen med hjälp av tabeller eftersom det var tydligt sätt att representera resultatet. För att ge en inblick i hur varje enskilt företag arbetar utarbetades även en deskriptiv sammanfattning av varje företag.För att kunna ge förbättringsförslag till universitetets CAD- och ritteknikskurser granskades några av de nuvarande kursernas kursplaner. Detta tillsammans med en informell intervju av de kursansvariga ledde till bättre insikt om hur kurserna är uppbyggda och vad målen med dem är. Insikten om vad kurserna innehåller i dagsläget tillsammans med analysen av de studerade företagens arbetssätt bidrog till att ett antal förbättringsförslag kunde föreslås.Det visade sig att graden av användande av modernare arbetssätt varierar kraftigt bland företagen. Detta gjorde det svårt att komma fram till ett enhetligt resultat som gällde för alla de studerade företagen. Däremot kunde ett antal slutsatser dras. Bland annat används fortfarande 2D-ritningar flitigt som ett informationsbärande dokument. En övergång till att enbart använda 3D-modellen som informationsbärare noterades endast på ett utav företagen men nämndes på ett par andra.Papperslöst arbete verkar vara på frammarsch trots att vissa specifika moment fortfarande utförs på papper. Det noterades även att digitala system används för lagring och hantering av produktrelaterad information hos alla de studerade företagen.Det som ansetts värt att implementera i universitets obligatoriska kurser efter genomförd studie är främst ökad användning av PDM/PLM-system, introduktion av 3D-måttsättning samt utnyttjande av 3D-modellen vid tillverkning.
Soderquist, Hans L. "Automatic Geometric Data Migration Throughout Views of a Model Fidelity Family". BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/360.
Pełny tekst źródłaJohnson, Chad A. "The integration of CAD/CAM with virtual machining simulation and cost estimation". Ohio : Ohio University, 1997. http://www.ohiolink.edu/etd/view.cgi?ohiou1177434959.
Pełny tekst źródłaBey, Aurélien. "Reconstruction de modèles CAO de scènes complexes à partir de nuages de points basés sur l’utilisation de connaissances a priori". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10103/document.
Pełny tekst źródła3D models are often used in order to plan the maintenance of industrial environments.When it comes to the simulation of maintenance interventions, these 3D models have todescribe accurately the actual state of the scenes they stand for. These representationsare usually built from 3D point clouds that are huge set of 3D measurements acquiredin industrial sites, which guarantees the accuracy of the resulting 3D model. Althoughthere exists many works addressing the reconstruction problem, there is no solution toour knowledge which can provide results that are reliable enough to be further used inindustrial applications. Therefore this task is in fact handled by human experts nowadays.This thesis aims at providing a solution automating the reconstruction of industrialsites from 3D point clouds and providing highly reliable results. For that purpose, ourapproach relies on some available a priori knowledge and data about the scene to beprocessed. First, we consider that the 3D models of industrial sites are made of simpleprimitive shapes. Indeed, in the Computer Aided Design (CAD) field, this kind of scenesare described as assemblies of shapes such as planes, spheres, cylinders, cones, tori, . . . Ourown work focuses on planes, cylinders and tori since these three kind of shapes allow thedescription of most of the main components in industrial environment. Furthermore, weset some a priori rules about the way shapes should be assembled in a CAD model standingfor an industrial facility, which are based on expert knowledge about these environments.Eventually, we suppose that a CAD model standing for a scene which is similar to theone to be processed is available. This a priori CAO model typically comes from the priorreconstruction of a scene which looks like the one we are interested in. Despite the factthat they are similar theoretically, there may be significant differences between the sitessince each one has its own life cycle.Our work first states the reconstruction task as a Bayesian problem in which we haveto find the most probable CAD Model with respect to both the point cloud and the a prioriexpectations. In order to reach the CAD model maximizing the target probability, wepropose an iterative approach which improves the solution under construction each time anew randomly generated shape is tried to be inserted in it. Thus, the CAD model is builtstep by step by adding and removing shapes, until the algorithm gets to a local maximumof the target probability
Bénière, Roseline. "Reconstruction d’un modèle B-Rep à partir d’un maillage 3D". Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20034/document.
Pełny tekst źródłaNowadays, most of the manufactured objects are designed using CAD (Computer-Aided Design) software. Nevertheless, for visualization, data exchange or manufacturing applications, the geometric model has to be discretized into a 3D mesh composed of a finite number of vertices and edges. But, in some cases, the initial model may be lost or unavailable. In other cases, the 3D discrete representation may be modified, for example after a numerical simulation, and does not correspond anymore to the initial model. A retro-engineering method is then required to reconstruct a 3D continuous representation from the discrete one.In this Ph.D. Thesis, we present an automatic and comprehensive reverse engineering process mainly dedicated to 3D meshes of mechanical items. We present first several improvements in automatically detecting geometric primitives from a 3D mesh. Then, we introduce a clear formalism to define the topology of the object and to construct the intersections between primitives. At the end, we describe a new method to fit 3D parametric surfaces which is based on extracting regular rectangular grids. The whole process is tested on 3D industrial meshes and results in reconstructing consistent B-Rep models
Sellgren, Ulf. "Simulation-driven design : Motives, Means, and Opportunities". Doctoral thesis, KTH, Maskinkonstruktion, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2875.
Pełny tekst źródłaQC 20100810
Brulin, Jérôme. "Modélisation thermomécanique d'un creuset de haut fourneau". Thesis, Orléans, 2010. http://www.theses.fr/2010ORLE2047/document.
Pełny tekst źródłaThe blast furnace hearth is mainly composed of refractory materials to support strong thermo-mechanical loads. Indeed, there is a direct contact between its internal walls and the molten pig iron at 1500°C. The objective of this thesis is to develop a thermo-mechanical model able to locate the sensitive areas and to estimate the stress fields. Carbon blocks, masonries (bricks and mortars) and a carbon ramming mix are the main constituents of the hearth. In order to identify their behaviours, characterization tests have been developed for temperatures up to 1500°C. A modified Cam-Clay model is proposed in order to reproduce the hardening behaviour of the ramming mix. The influences of temperature and pressure are taken into account. Experimental and numerical results are in good agreement. Masonries, submitted to high temperature gradients are highly stressed, which can lead to the opening of the mortar joints. The proposed masonry modelling is based on a micro-macro approach where bricks and mortars are replaced by an equivalent homogenous material for different joint states. The non-linearity of the behaviour is reproduced thanks to a stress criterion, allowing the transition from one state to another. Homogenized properties are obtained by periodic homogenization with an energetic approach. The modeling of a shear test available in the literature allows the validation of this model. The final modelling of a hearth is compared with in-situ instrumentation results. A good agreement is reached between these results
Paradorn, Vasin. "An Impact Model for the Industrial Cam-follower System: Simulation and Experiment". Digital WPI, 2007. https://digitalcommons.wpi.edu/etd-theses/1096.
Pełny tekst źródłaSedláček, Petr. "Pevnostní a modální analýza v parametrických adaptivních CAD programech". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218805.
Pełny tekst źródłaFang, Chen Yihui. "Modélisation thermique des moteurs asynchrones en vue de la réalisation d'un outil CAO". Rouen, 1994. http://www.theses.fr/1994ROUE5077.
Pełny tekst źródłaBenchaib, Khadidja. "Modèle facile d'emploi de transistor bipolaire pour la CAO en électronique de puissance". Toulouse, INPT, 1991. http://www.theses.fr/1991INPT007H.
Pełny tekst źródławei, Jonny, i Pär Palmebäck. "Locust System Integration into Demo Vechicles". Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8252.
Pełny tekst źródłaThis thesis project was carried out at Volvo Car Corporation. It is based on an EU project called Locust in which a bio-inspired visual sensor system (the Locust sensor system) for automotive collision avoidance was developed. The Locust sensor system is designed to emulate the collision avoidance functionality of the Locust grasshopper, which is well-known for its extraordinary vision based collision avoidance ability, in particular with regard to its fast reaction times to perceived threats. Volvo Car Corporation is interested in the possibility of using the bio-inspired technology developed in the Locust project to improve its already existing collision avoidance systems. Pedestrian collision avoidance is of high interest, for which the properties of the Locust grasshopper are desirable.
The purpose of this thesis project is to develop two demonstrator vehicles to test the performance of the Locust sensor system, carry out the testing, and evaluate its usability for Volvo Car Corporation. The first vehicle is a scale 1:5 model car that was originally developed in a thesis project at KTH, and the second a full scale Volvo XC90.
It was found in the testing that the Locust sensor system is promising for pedestrian collision avoidance applications. The results for detecting other vehicles were also acceptable, but Volvo Car Corporation already has other collision avoidance systems with better performance in this regard. In general the test results were very good for speeds up to about 40 km/h. This indicates that the Locust sensor system would be most usable in a city driving environment, parking lot situations, and for driving in residential areas.
Klíma, Jiří. "Aplikace víceosového frézování na obrábění tvarové součásti". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231738.
Pełny tekst źródłaMurdoch, Brian. "Finite element-CAD integrated BOD model". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/MQ30525.pdf.
Pełny tekst źródłaKeating, Daniel. "Model Checking Time Triggered CAN Protocols". Thesis, University of Canterbury. Electrical and Computer Engineering, 2011. http://hdl.handle.net/10092/5754.
Pełny tekst źródłaViana, do Espírito Santo Ilísio. "Inspection automatisée d’assemblages mécaniques aéronautiques par vision artificielle : une approche exploitant le modèle CAO". Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2016. http://www.theses.fr/2016EMAC0022/document.
Pełny tekst źródłaThe work presented in this manuscript deals with automated inspection of aeronautical mechanical parts using computer vision. The goal is to decide whether a mechanical assembly has been assembled correctly i.e. if it is compliant with the specifications. This work was conducted within two industrial projects. On one hand the CAAMVis project, in which the inspection sensor consists of a dual stereoscopic head (stereovision) carried by a robot, on the other hand the Lynx© project, in which the inspection sensor is a single Pan/Tilt/Zoom camera (monocular vision). These two projects share the common objective of exploiting as much as possible the CAD model of the assembly (which provides the desired reference state) in the inspection task which is based on the analysis of the 2D images provided by the sensor. The proposed method consists in comparing a 2D image acquired by the sensor (referred to as "real image") with a synthetic 2D image generated from the CAD model. The real and synthetic images are segmented and then decomposed into a set of 2D primitives. These primitives are then matched by exploiting concepts from the graph theory, namely the use of a bipartite graph to guarantee the respect of the uniqueness constraint required in such a matching process. The matching result allows to decide whether the assembly has been assembled correctly or not. The proposed approach was validated on both simulation data and real data acquired within the above-mentioned projects
Lichah, Tony. "Développement de la qualité numérique des modèles CAO surfaciques : application à la définition de formes de style dans le domaine de l'automobile". Valenciennes, 1998. https://ged.uphf.fr/nuxeo/site/esupversions/efcd3fed-9e4d-4a32-8cad-78bf1cab1059.
Pełny tekst źródłaThis thesis aims to define and develop the notion of numerical quality of CAD surfacic models and its application to the style shapes modelization in the automotive industry. We present in a first chapter process of freeform shapes modelization in industrial design before and after the advent of computers. In connection with that, we present the main mathematical methods of curves and surfaces modelization in CAD. In a second chapter, we define the notion of quality of CAD surfacic models. This quality includes two main aspects : the geometrical quality and the numerical quality. One suggests here of specifying the notion of numerical quality. We give an overview of problems bound to the numerical definition of CAD surfacic models and we pose the concepts on wich lies the numerical quality. In a third chapter, we present the development of an analysis and control tool of the numerical quality of CAD surfacic models. This development leads to the definition of a criteria and quality indicators set. These indicators proceed from the numerical data describing curves and surfaces of a model and return values allowing a quality rating. An implementation of this tool is performed and its application framework is specified. Its application to some cases tests concluded to its validation. In a fourth chapter, we develop new curves modelization methods by smoothing. These methods contribute to the quality insurance of CAD surfacic models. They use for this purpose particular curves which definition insure numerical quality high level results. These curves are dedicated to the modelization of shapes with a smooth varying curvature
Moron, Véronique. "Mise en correspondance de données 3D avec un modèle CAO : application à l'inspection automatique". Lyon, INSA, 1996. http://theses.insa-lyon.fr/publication/1996ISAL0131/these.pdf.
Pełny tekst źródłaThis work deals with the automatic inspection of solid based free-form surfaces, using 3D data produced either by a 3D Range sensor or by a Coordinate Measuring Machine. We first introduce a complete state of the art in the 3D modelisation domain. We select two kinds of surface-based models, the first is an interpolated triangulated model, and the other one is an exact NURBS surfaces based model. For each of them, we state the computation of the point/surface entity distance. We present an automatic and robust (up to 50 % of outlier points) general registration method, capable of registering 3D data with a geometric model in any initial state. We apply this method for different applications, like pattern recognition. But mainly for automatic inspection of complex parts. We state an inspection method that produces an inspection report including numerical results concerning global or local tolerance verification. The other outputs are several types of coloured versions of the model indicating the level of discrepancy between the measured points and the model. Using this colouring scheme, an operator or a robotic system can rapidly identify defective parts or monitor process drift on a production line
Ozkan, Sevda. "The Way Architectural Model As A New Collaborative Design Environment Talks With Machines". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609381/index.pdf.
Pełny tekst źródłaMavrogenis, Alexandre. "Le couplage des systèmes de CAO et de calcul : comment, en exploitant le modèle CAO d'un objet ou d'une structure, nous obtenons automatiquement une simplification de la géométrie et le modèle éléments finis". Toulouse 3, 1994. http://www.theses.fr/1994TOU30250.
Pełny tekst źródłaTeodorov, Ciprian. "Model-driven physical design for future nanoscale architectures". Brest, 2011. http://www.theses.fr/2011BRES2050.
Pełny tekst źródłaIn the context where the traditional CMOS technology approaches its limits, some nanowire-based fabric proposals emerged, which all exhibit some common key characteristics. Among these, their bottom-up fabrication process leads to a regularity of assembly, which means the end of custom-made computational fabrics in favor of regular structures. Hence, research activities in this area, focus on structures conceptually similar to today’s reconfigurable PLA and/or FPGA architectures. A number of different fabrics and architectures are currently under investigation, e. G. CMOL , FPNI, NASIC. These proof-of-concept architectures take into account sortie fabrication constraints and support fault-tolerance techniques. What is still missing is the ability to capitalize on these experiments while offering a one-step shopping point for further research, especially at the physical-design level of the circuit design tool-flow. Sharing metrics, tools, and exploration capabilities is the next challenge to the nano-computing community. We address this problem by proposing a model-driven physical-design toolkit based on the factorization of common domain-specific concepts and the reification of the tool-flow. We used this tool-flow to drive the design-space exploration in the context of a novel nanoscale architecture, and we showed that such an approach assures design convergence based on frequent quantitative evaluations, moreover it enables incremental evolution of the architecture and the automation flow
Patel, Paresh S. "Automatic CAD model processing for downstream applications". Diss., Mississippi State : Mississippi State University, 2005. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.
Pełny tekst źródłaVolný, Jiří. "Management kvality ve veřejné správě - Model CAF". Master's thesis, Vysoká škola ekonomická v Praze, 2006. http://www.nusl.cz/ntk/nusl-26.
Pełny tekst źródłaZeman, David. "Model CAF ve vybrané organizaci veřejné správy". Master's thesis, Vysoká škola ekonomická v Praze, 2015. http://www.nusl.cz/ntk/nusl-205687.
Pełny tekst źródłaMcFarland, Matthew Ogden. "Enhanced Cal Poly SuPER System Simulink Model". DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/376.
Pełny tekst źródłaZechmeisterová, Věra. "Model elektronického obchodu pro služby". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-222009.
Pełny tekst źródłaGasseling, Tony. "Caractérisation non linéaire avancée de transistors de puissance pour la validation de leur modèle CAO". Limoges, 2003. http://www.theses.fr/2003LIMO0041.
Pełny tekst źródłaAdvanced functional characterizations of power transistors for the validation of nonlinear models of SC devices used in CAD packages. This work deals with different functional characterization methods for the design of optimized power amplifiers. These characterizations are carried out on transistors at the first stages of the design, in a source and load-pull environment. Thus, it is shown that a pulsed load-pull set up is very useful to validate the technologies used for the generation of high power at RF and microwave frequencies. It also enables to deeply validate the thermoelectric nonlinear models of transistors developed for this purpose. For the design of amplifiers which operate up to millimetric frequencies (Ku / K Band), reaching high power under constraint of efficiency and linearity is one of the most critical point because of the weak reserves of power gain proposed. In this context, the development of an active source and load-pull setup is of prime importance. It enables to primarily determine the transistor optimum operating conditions (Matching and DC bias) to reach the best trade off between efficiency and linearity. Finally, a new method to perform Hot Small-Signal S-Parameter measurements of power transistors operating under large signal conditions is proposed. An application to the prediction of parametric oscillations when the transistor is driven by a pump signal is demonstrated
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". Phd thesis, Université Henri Poincaré - Nancy I, 2005. http://tel.archives-ouvertes.fr/tel-00105732.
Pełny tekst źródłaEn regard de cette problématique, la première partie de ce mémoire présente un état de l'art des différentes méthodes de transformation de modèles par reconnaissance d'entités et met en évidence l'inadéquation de celles-ci aux pièces aéronautiques. Nous proposons alors d'élaborer pour les tâches de préparation à la fabrication un modèle FAO s'appuyant directement sur le modèle CAO B-Rep, auquel sont ajoutées des informations relatives aux possibilités d'usinages des différentes faces le constituant. Chaque face enrichie du modèle est alors considérée comme une entité d'usinage dite « élémentaire ».
Pour aboutir à ce modèle FAO, nous proposons une méthodologie de transformation composée d'une vue statique (modèle de données) et d'une vue dynamique (processus de transformation). La deuxième partie du mémoire présente la vue statique. Elle s'appuie sur le modèle des données nécessaires au processus de transformation obtenu à l'aide de la méthodologie VIM (Viewpoint Integration Modelling). La vue dynamique, présentée dans la troisième partie, est constituée de deux étapes de traitements : la première dite étape « d'enrichissement » complète le modèle CAO par des attributs géométriques et technologiques, la seconde dite étape « d'analyse d'usinabilité » traite ce modèle enrichi afin d'adjoindre aux faces des informations d'usinage. Elle aboutit finalement au modèle FAO composé d'entités élémentaires.
Pour finir, nous validons, dans la dernière partie, les spécifications proposées par le développement et la mise en œuvre d'un démonstrateur sous CATIAV5®. Nous présentons les résultats obtenus sur quelques pièces aéronautiques.
Bhattacharyya, Arkaprava. "Non quasi-static effects investigation for compact bipolar transistor modeling". Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14294/document.
Pełny tekst źródłaModern high speed (RF) transistors encounter certain delay while operated at high frequency or under fast transient condition. This effect is named as Non Quasi Static (NQS) effect. In the current work, NQS effect is analyzed in a concise manner so that it can be readily implemented in a compact model using the VerilogA description language. The basic physics behind this effect is investigated in small signal domain and the results are compared with the published work. In popular bipolar model HICUM lateral and vertical NQS are examined separately and uses the same model for both transient and AC operation which requires an additional minimum phase type sub circuit. Compact modeling with HICUM model is performed in both measurement and device simulated data. At last, an improved excess phase circuit is proposed to model the NQS effect
Wang, YueYi. "Ca2+ handling in a mice model of CPVT". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS156/document.
Pełny tekst źródłaThe cardiac type-2 ryanodine receptor (RyR2) encodes a Ca2+ release channel on sarcoplasmic reticulum (SR) membrane in cardiomyocytes, including sinoatrial node (SAN) myocytes, and releases Ca2+ required for contraction and SAN spontaneous rhythm. Its genetic defects are related to catecholaminergic polymorphic ventricular tachycardia (CPVT), which is a lethal heritable disease characterized by exercise/stress-induced syncope and/or sudden cardiac death. Interestingly, CPVT patients frequently present SAN dysfunction as bradycardia at rest.In a previous study, a novel CPVT-related RyR2 mutation (RyR2R420Q) in a Spanish family, associated with SAN dysfunction was reported. R420 is located at the N-terminal portion of the channel and seems to be an important site for maintaining a stable A/B/C domain of N-terminus in RyR2. As N-terminal mutation resultant RyR2 behaviour and SAN function are never analyzed before, we created the KI mice model bearing mutation R420Q to understand the underlying mechanism.In this thesis, we found increased Ca2+ release during diastole, indicating a gain-of-function effect of RyR2 N-terminal mutation R420Q. Interestingly, this defect may not be only an enhanced activity, as the Ca2+ sparks frequency was only slightly increased in KI, but also the closing mechanism, producing longer Ca2+ sparks. That is, the number of Ca2+ sparks is increased by the RyR2R420Q mutation, and meanwhile the amount of Ca2+ released in each Ca2+ spark is also dramatically enhanced. This increased Ca2+ release retards SR Ca2+ replenishment, disrupting the Ca2+ clock and the coupled clock, resulting in the slower SAN function. Thus favouring RyR stabilization in the closing state might not be an adequate therapy but accelerating its closure
Cao, Zhiyu [Verfasser]. "Model-Based Development of DC-DC Converters with Wide Operation Range and High Dynamics / Zhiyu Cao". Aachen : Shaker, 2014. http://d-nb.info/1053361521/34.
Pełny tekst źródłaChong, K. W. "Development of 3D surfaces based on an energy model for woven fabrics". Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246457.
Pełny tekst źródłaDerigent, 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.
Pełny tekst źródłaAutomating 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
Higgs, Bryan James. "Application of Naturalistic Truck Driving Data to Analyze and Improve Car Following Models". Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/36089.
Pełny tekst źródłaMaster of Science
Murthy, J. N. "Gas turbine combustor modelling for design". Thesis, Cranfield University, 1988. http://hdl.handle.net/1826/2626.
Pełny tekst źródłaKim, Young Min. "A two-dimensional charge control model and an analytic CAD model for MODFETs /". The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487322984315963.
Pełny tekst źródłaLu, Nan. "La modélisation de l'indice CAC 40 avec le modèle basé agents". Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC0004/document.
Pełny tekst źródłaWe develop an agent-based model to replicate two frequently observed anomalies in the financial markets: the fat tails and the clustered volatility of the distribution of the returns. Our goal is to show conclusively that these anomalies could be attributed to a mimetic formation of the expectations of the stakeholders in the markets. We did not follow the rencent developpments in the field of the ACE model in the finance, but we propose a very simple model which is estimated from the stylized facts of the French daily index CAC 40. The hypothesis of mimetic anticipations can thus be tested: it is not rejected in our modeling
Borek, Jiří. "Implementace modelu CAF ve vybraných institucích samosprávy". Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-71825.
Pełny tekst źródłaMartin, Lionel. "Intégration du métier de la fonderie dans les processus de conception : méthodologies et outils associés". Phd thesis, Paris, ENSAM, 2006. http://pastel.archives-ouvertes.fr/pastel-00002137.
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