Dissertations / Theses on the topic 'Large scale 3D printing'
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Barducci, Federica. "3D printing: l’evoluzione della tecnologia nel settore costruzioni." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Find full textKaya, Fuat Emre. "Applications of Additive Manufacturing in Construction and Historic Building Restoration/Rehabilitation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22784/.
Full textBatlle, Subirós Elisabet. "Large-Scale Surface registration." Doctoral thesis, Universitat de Girona, 2008. http://hdl.handle.net/10803/7606.
Full textThe main contribution of this thesis is the proposal of a new 3D multiview registration strategy. The proposed approach detects revisited regions obtaining cycles of views that are used to reduce the inaccuracies that may exist in the final model due to error propagation. The method takes advantage of both global and local information of the registration process, using graph theory techniques in order correlate multiple views and minimize the propagated error by registering the views in an optimal way. The proposed method has been tested using both synthetic and real data, in order to show and study its behavior and demonstrate its reliability.
La primera part d'aquest treball presenta una anàlisi acurada de les tècniques de registre 3D es rellevants, incloent tècniques d'estimació de la posició inicial, registre pairwise i registre entre múltiples vistes. S'ha proposat una nova classificació de les tècniques, depenent de les seves aplicacions i de l'estratègia utilitzada.
La contribució mes important d'aquesta tesi és la proposta d'un nou mètode de registre 3D utilitzant múltiples vistes. El mètode proposat detecta regions ja visitades prèviament, obtenint cicles de vistes que s'utilitzen per tal de reduir els desalineaments en el model final deguts principalment a la propagació de l'error durant el procés de registre. Aquest mètode utilitza tant informació global com local, correlacionant les vistes mitjançant tècniques de grafs que permeten minimitzar l'error propagat i registrar les vistes de forma òptima. El mètode proposat ha estat provat utilitzant dades sintètiques i reals, per tal de mostrar i analitzar el seu comportament i demostrar la seva eficàcia.
Vidal, Luciano. "Large bone defects reconstruction by using vascularization and 3D printing." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT1034.
Full textLarge bone defect reconstruction constitutes a challenge for orthopedists and plastic surgeons. This thesis is divided into three chapters. The first chapter gives a review of the current surgical options and future technologies such as 3D printing for regeneration of large bone defects. The gold standard technique for bone reconstruction is autologous free flap transplantation that contains patient’s own cells, growth factors and a vascularization bed but induces morbidity. The second chapter evaluates an experimental approach consisting of the in situ production of a pre-vascularized synthetic bone graft and its subsequent transplantation to a critical-sized bone defect in rabbits. This animal study demonstrated the benefit of pre-vascularization of synthetic bone grafts for regenerating large bone defects but still required two surgeries. The third chapter aimed to investigate the feasibility of regenerating large bone defects in one surgical step by using 3D-printed customized calcium phosphate scaffolds with or without vascularization. This pre-clinical study demonstrated the benefits of pre-surgical planning for reconstruction of large bone defects with 3Dprinted personalized scaffolds and axial vascularization. In conclusion, this works enables to propose a new approach in regenerative medicine with customized and vascularized for large bone defect reconstruction
Chou, George Tao-Shun. "Large-scale 3D reconstruction : a triangulation-based approach." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86296.
Full textIncludes bibliographical references (p. [153]-157).
by George Tao-Shun Chou.
Ph.D.
Magaya, Tafadzwa A. "Additive manufacturing (3 D printing) : challenges and opportunities for large scale adoption." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111466.
Full textCataloged from PDF version of thesis.
Includes bibliographical references.
3D printing (additive manufacturing) has been around for more than 30 years. A lot of technological progress has been made in that time, most recently with new innovations such as metal 3D printing. Although the technology seems to hold a lot of promise, the rate of adoption has not lived up to the hype. The aim of this thesis is to research what has stopped 3D printing from catching on faster? What factors are hindering large scale adoption for mass production? We apply the "Iterating to Insights" framework to analyze technology limitations, market dynamics, business models and industry structure and to develop strategic insights that are surprising yet compelling. Our end goal was to develop a set of insights that can be used by an investor in a 3D printing company to evaluate whether an application or market being pursued by a potential investment is worthwhile or not.
by Tafadzwa A. Magaya.
M.B.A.
Marsh, Georgina E. "Utilising micron-scale 3D printing to investigate particulate interactions for respiratory applications." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/50247/.
Full textPietrok, Jack. "Real-Time Stylized Rendering for Large-Scale 3D Scenes." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2331.
Full textBooth, James. "The construction and application of large scale 3D facial models." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/62330.
Full textWang, Chen. "Large-scale 3D environmental modelling and visualisation for flood hazard warning." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/3350.
Full textKühner, Tilman [Verfasser], and C. [Akademischer Betreuer] Stiller. "Large-Scale Textured 3D Scene Reconstruction / Tilman Kühner ; Betreuer: C. Stiller." Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1221186965/34.
Full textSelin, Magnus. "Efficient Autonomous Exploration Planning of Large-Scale 3D-Environments : A tool for autonomous 3D exploration indoor." Thesis, Linköpings universitet, Artificiell intelligens och integrerade datorsystem, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-163329.
Full textYiakoumettis, Christos. "Semantic navigation of large scale geo-referenced 3D scenes and virtual worlds." Limoges, 2012. https://aurore.unilim.fr/theses/nxfile/default/389358e4-be58-45f6-8896-1e8dc57d1b24/blobholder:0/2012LIMO4049.pdf.
Full textLes évolutions technologiques actuelles font entrer la géo-informatique 3D à son âge numérique, permettant de nouvelles applications potentielles dans le domaine du tourisme virtuel, du loisir, du divertissement et du patrimoine culturel. Des mondes virtuels 3D et des scènes géo-référencées sont utilisés encore plus dans les simulations de catastrophes physiques et de plan d'évacuation ou de scénarios militaires. Il est prouvé que les informations 3D offrent un moyen naturel de navigation. Cependant la personnalisation est un aspect essentiel dans un système de navigation. En dehors des optimisations de distance et du temps l'intégration des préférences des utilisateurs est finalement le point les important d'une navigation. Une architecture efficace de planification d'itinéraire personnalisée est basée tant sur des critères géométriques que sur les préférences de l'utilisateur. Dans ce travail, un cadre multi-couche intégrée est introduit, pour soutenir une navigation efficace centrée sur l'utilisateur, dans des mondes 3D. Habituellement, les préférences de l'utilisateur sont exprimées sous forme d‟un ensemble de poids qui représente le degré d'importance du contenu des métadonnées sémantiques de la scène sur le processus de sélection du tracé. Ces poids, cependant, sont définis par les utilisateurs, en mettant la complexité du côté de l'utilisateur, ce qui rend la personnalisation une tâche ardue. Dans ce travail, une approche alternative est proposée dans laquelle les poids du contenu des métadonnées sont estimés implicitement et de façon transparente pour les utilisateurs, en déplaçant la complexité du côté du système. Ce résultat est obtenu par l'introduction d'une stratégie d'apprentissage en ligne par retour d'expérience qui ajuste automatiquement les poids de variables des métadonnées par exploitation de l'information renvoyée vers le système sur la pertinence des jugements de préférences utilisateur présentés sous une forme de comparaisons par paires. Dans la pratique la mise en oeuvre d'un algorithme de retour d'expérience présente la limitation que plusieurs comparaisons par paires (échantillons) sont nécessaires pour converger vers un ensemble de poids de variables des métadonnées fiables. Pour cette raison, dans ce travail une stratégie de rectification de poids est proposée qui permet d'estimer le poids en exploitant les interrelations de variables de métadonnées définies par une ontologie. Dans la suite, un algorithme d'optimisation génétique est proposé pour sélectionner les itinéraires les plus préférés de l'utilisateur basé sur une approche d'optimisation multi-critères. Pour améliorer le degré de personnalisation en navigation 3D, un algorithme efficace est également mis en place pour estimer les trajectoires 3D autour des objets choisis par la fusion de meilleurs vues projetées en 2D qui contiennent des faces qui ont la plus grande préférence des utilisateurs. Des simulations et des comparaisons ont été effectuées avec d'autres approches, soit dans le domaine de l'apprentissage en ligne ou du choix du tracé en utilisant des mesures objectives en termes de précision et de rappel des valeurs
Miksik, Ondrej. "Living in a dynamic world : semantic segmentation of large scale 3D environments." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:28050b9e-5e42-46b5-9a54-004450f812ec.
Full textRudraraju, Anirudh V. "Digital data processing and computational design for large area maskless photopolymerization." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52930.
Full textTeo, Nicholas J. "Nano, Micro and Macro Scale Control of Porous Aerogel Morphology." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron154989595598542.
Full textSimon, Loïc. "Procedural reconstruction of buildings : towards large scale automatic 3D modeling of urban environments." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00637638.
Full textParys, Roman [Verfasser], and Andreas [Akademischer Betreuer] Schilling. "Reconstruction of Large Scale 3D Models from Images / Roman Parys ; Betreuer: Andreas Schilling." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1162971363/34.
Full textHittner, Brian Edward. "Rendering large-scale terrain models and positioning objects in relation to 3D terrain." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FHittner.pdf.
Full textThesis advisor(s): Don Brutzman, Curt Blais. Includes bibliographical references (p. 117-118). Also available online.
Peterson, Dirk N. "Using large scale aerial images for 3D visualizations of Marion Sampson Park mountain bike trails." Diss., Maryville, Mo. : Northwest Missouri State University, 2008. http://www.nwmissouri.edu/library/theses/PetersonDirk/index.htm.
Full textThe full text of the thesis is included in the pdf file. Title from title screen of full text.pdf file (viewed on December 17, 2008) Includes bibliographical references.
Gattoni, Gaia. "Analysis of the infrastructures to build immersive visit at large scale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Find full textCebecauer, Matej. "Short-Term Traffic Prediction in Large-Scale Urban Networks." Licentiate thesis, KTH, Transportplanering, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-250650.
Full textQC 20190531
Schott, Benjamin [Verfasser], and R. [Akademischer Betreuer] Mikut. "Interactive and Quantitative Knowledge-Discovery in Large-Scale 3D Tracking Data / Benjamin Schott ; Betreuer: R. Mikut." Karlsruhe : KIT-Bibliothek, 2018. http://d-nb.info/1174252219/34.
Full textKim, Chul. "3D-SoftChip: A novel 3D vertically integrated adaptive computing system [thesis]." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2005. https://ro.ecu.edu.au/theses/656.
Full textAbayowa, Bernard Olushola. "Automatic Registration of Optical Aerial Imagery to a LiDAR Point Cloud for Generation of Large Scale City Models." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1372508452.
Full textWoods, Benjamin Samuel. "Enhancing the Capabilities of Large-Format Additive Manufacturing Through Robotic Deposition and Novel Processes." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/98843.
Full textMaster of Science
Additive manufacturing (AM), also known as 3D printing, is a method of manufacturing objects in a layer-by-layer technique. Large-format AM is typically defined as an AM system that can create an object larger than 1 m3. There are only a few manufacturers in the world of these systems, and all currently are built on gantry-based motion stages that only allow movement of the printer in three principal axes (X, Y, Z). The primary goal of this thesis is to construct a large-format AM system that uses a robotic arm to enable printing in any direction or orientation. The use of an industrial robotic arm enables printing in multiple planes, which can be used to print structures without support structures, print onto curved surfaces, and to purt with curved layers which produces a smoother external part surface. The design of the large-format AM system was validated through successful printing of objects as large as 1.0x0.5x1.2 m, simultaneous printing of a sacrificial support material to enable overhanging features, and through completing multi-axis printing. To enable multi-axis printing, an algorithm was developed to determine the proper toolpath location and relative orientation to the part surface. Using a part's STL file as input, the algorithm identifies the normal vector at each movement command, which is then used to calculate the required tool orientation. The tool orientations are then assembled with the movement commands to complete the multi-axis toolpath for the robot to perform. Finally, this research presents a method of using a second printing tool to deposit a secondary, water-soluble material to act as supporting structures for overhanging and bridging part features. While typical 3D printers can generally print sacrificial material for supporting overhangs, large-format printers produce layers up to 25 mm wide, rendering any support material impossible to remove without post-process machining. This limits the range of geometries able to be printed to just those with no steep overhangs, or those where the support material is easily reachable by a tool for removal. The solution presented in this work enables the large scale AM processes to create complex geometries.
Liu, Jun. "A Combination method of Fingerprint Positioning and Propagation Model Based localization scheme in 3D Large-Scale Indoor Space." Thesis, Mittuniversitetet, Avdelningen för informationssystem och -teknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-34918.
Full textGraehling, Quinn R. "Feature Extraction Based Iterative Closest Point Registration for Large Scale Aerial LiDAR Point Clouds." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1607380713807017.
Full textHassan, Raju Chandrashekara. "ANALYSIS OF VERY LARGE SCALE IMAGE DATA USING OUT-OF-CORE TECHNIQUE AND AUTOMATED 3D RECONSTRUCTION USING CALIBRATED IMAGES." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1189785164.
Full textHayden, Shane Makana. "Introducing the VuePod: Development and Testing of a Low-Cost Large-Scale Stereoscopic Immersive System Using 3D LCD Televisions." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3823.
Full textMinz, Jacob Rajkumar. "Physical Design Automation for System-on-Packages and 3D-Integrated Circuits." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14012.
Full textXinyu, Chang. "Neuron Segmentation and Inner Structure Analysis of 3D Electron Microscopy Data." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1369834525.
Full textLundgren, Herman. "Participatory design of a 3D-printed furniture concept for learning spaces : A study of large-scale additive manufacturing opportunities and limitations." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik, konst och samhälle, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86535.
Full textIdag sitter läromiljöer fast i den industriella epoken med rader av skrivbord och stolar. Differentierad undervisning och personlig inlärning är inte effektiv i traditionella läromiljöer och bör vara i fokus för att skapa framtidens klassrum (Kariippanon, 2017). Detta examensarbete tar upp hur inredning för inlärningsmiljöer kan förbättras och utformas genom en deltagande designprocess med Katedralskolan i Växjö med hjälp av återvunna material och additiv tillverkningsteknik. Arbetet har också undersökt möjligheterna att involvera intressenter för att skapa nytt lärande genom tillämpning av additiv tillverkning inom inredning och möbeldesign. Tillsammans med Katedralskolan och Sculptur har detta projekt undersökt ett koncept för skolor att ha integrerad utbildning i möbler genom semiotik och pedagogisk design som kommer att bidra till elevernas lärande samt utforska storskalig additiv tillverkning. Målet är att utforma en samling möbelkoncept som informerar och kommunicerar på utbildningsnivå och hur en cirkulär tillverkningsteknik är möjlig genom 3D-printnig med hjälp av kommuniationsdesign och semiotik. Målet är också att förstå Sculpturs produktutvecklings- och tillverkningsprocess genom storskalig additiv tillverkning. Projektets Mission statement var följande: Utveckla ett möbelkoncept baserat på en förståelse av behoven hos användargruppen i en samdesignprocess som ett fall för att studera storskalig additiv tillverkning tillsammans med de givna förutsättningarna från Sculptur. Examensarbetet har följt en iterativ designprocess som kallas design thinking process (The Interaction Design Foundation, 2021) tillsammans med en co-designprocess (Sanders, 2018). Design thinking är en designmetodik som ger en lösningsbaserad metod för att lösa problem. De fem faserna i design thinking är följande: Empathise, Define, Ideate, Prototype, Test. Genom studier, undersökningar och observationer skapades en lista över intressenters behov och användes när idéer utvecklades genom workshops, skisser och prototyper. Idéerna utvecklades sedan till koncept som sedan testades genom både mindre 3D-utskrift och storskalig additiv tillverkning. Koncepten utvärderades också av intressenter samt genom en konceptviktningsmatris (Wikberg N., et.al., 2015). Resultatet av detta examensarbete är sammanfattningen av möbelkonceptet samt studien av storskalig additiv tillverkning som industridesigner. Möbelkonceptet ”Unfold lounge chair” bygger på intressenternas behov samt tillverkningsrestriktioner. Det är också ett försök att använda teori för att skapa nästa generation av pedagogiska möbler med hållbara och cirkulära tillverkningstekniker. Genom design thinking skapades resultatet med ett mänskligt centrerat tillvägagångssätt för att integrera människors behov, teknikens möjligheter och kraven för produktens framgång (IDEO, n.d.).
Engel, Jakob-Julian [Verfasser], Daniel [Akademischer Betreuer] Cremers, Daniel [Gutachter] Cremers, and Andrew [Gutachter] Davison. "Large-Scale Direct SLAM and 3D Reconstruction in Real-Time / Jakob-Julian Engel ; Gutachter: Daniel Cremers, Andrew Davison ; Betreuer: Daniel Cremers." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1149824174/34.
Full textFeuray, William. "Multiplexeurs Accordables pour Application Spatiale." Thesis, Limoges, 2017. http://www.theses.fr/2017LIMO0115/document.
Full textThis thesis is about study of tunable output multiplexer principle for telecommunication satellite payload. The first step is analysis of the main topologies of output multiplexers and to compare them to conclude with the best candidate. Then, several studies were conducted on 3D plastic printed passive components with specific metallizations, searching how to improve results in term of losses and precision. Last part detailed two channels multiplexer design which can be used on three different states of relative bandwidth from 1.6 to 4.8 % at 19 GHz, and realization of two concept proof prototypes (one in metallized 3D printed plastic and another one in machined aluminum)
Klimke, Jan [Verfasser], Jürgen [Akademischer Betreuer] Döllner, Robert [Akademischer Betreuer] Hirschfeld, Jürgen Gutachter] Döllner, Hartmut [Gutachter] [Asche, and Birgit [Gutachter] Kleinschmit. "Web-based provisioning and application of large-scale virtual 3D city models / Jan Klimke ; Gutachter: Jürgen Döllner, Hartmut Asche, Birgit Kleinschmit ; Jürgen Döllner, Robert Hirschfeld." Potsdam : Universität Potsdam, 2018. http://d-nb.info/1218169192/34.
Full textKlimke, Jan [Verfasser], Jürgen [Akademischer Betreuer] Döllner, Robert [Akademischer Betreuer] Hirschfeld, Jürgen [Gutachter] Döllner, Hartmut [Gutachter] Asche, and Birgit [Gutachter] Kleinschmit. "Web-based provisioning and application of large-scale virtual 3D city models / Jan Klimke ; Gutachter: Jürgen Döllner, Hartmut Asche, Birgit Kleinschmit ; Jürgen Döllner, Robert Hirschfeld." Potsdam : Universität Potsdam, 2018. http://d-nb.info/1218169192/34.
Full textNachabe, Nour. "Évaluation des technologies d'impression 3D pour le développement d'antennes directives à large bande passante pour les liaisons backhaul en bandes millimétriques V et E." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4118/document.
Full textIn order to address the ever-increasing demand of higher data rates, adding small cells to the existing macrocells infrastructure is one of the most important milestones of the 5G roadmap. With the integration of small cells and the re-organization of the network topology, backhaul bottleneck is the main challenge to address in the near future. Facing the costs of deployments of fiber optic connections, point-to-point wireless backhaul links using millimeter wave (mmW) frequencies are gaining prominence. 5G future frequencies, to be discussed under the World Radiocommunication Conference 2019 (WRC-19) open-up the way towards mmW frequency band where large bandwidths are naturally available. The high bandwidths available at these frequencies enable several Gbps data rate backhaul links, which is un utmost necessity to respect the 100 Mbps user-experienced data rate promised by the 5G standard. Millimeter-wave frequencies in V and E-bands unlicensed/light licensed spectrum are considered as primary candidates for backhaul links. In addition to the light license regime, the high free space path loss experienced at these frequencies is rather beneficial to limit the interference between small cells links. Moreover, the high available bandwidths at V and E-bands enable to achieve multi Gb/s links without using complex modulation schemes. In this thesis, we focused our research study on developing high gain wide-band antennas usable in point-to-point backhaul links in a Line of Sight (LoS) context. Leveraging cost-efficient technologies like 3D printing and Printed Circuit Board (PCB) on FR4 substrates, we studied two high-gain antenna types: lens antennas and flat array antennas
Su, Po-Chang. "A ROBUST RGB-D SLAM SYSTEM FOR 3D ENVIRONMENT WITH PLANAR SURFACES." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/17.
Full textPuttaswamy, Kiran. "Designing high-performance microprocessors in 3-dimensional integration technology." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19759.
Full textCommittee Chair: Loh, Gabriel H.; Committee Co-Chair: Lee, Hsien-Hsin S.; Committee Member: Lim, Sung Kyu; Committee Member: Prvulovic, Milos; Committee Member: Yalamanchili, Sudhakar; Committee Member: Yoder, Douglas.
Kleinfehn, Alex Patrick. "Scale-Up of Modifiable Poly(propylene fumarate) and Surface Functionalization of Additive Manufactured Scaffolds for Bone Tissue Regeneration." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1562679460809562.
Full textLeksell, Torbjörn. "Can market specialization reduce the entry cost of automated largescale 3D-scanning of movable artifacts for culture and heritage preservation?" Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234308.
Full textAutomatiserade 3D-scanners som kan 3D-scanna stora volymer av konstprodukter är viktiga verktyg inom kulturhistorisk bevaring då det tillåter museum att digitalisera samlingar i syfte att bevara, forska och ställa ut. Tyvärr så är dessa system dyra och bara ett fåtal museer har resurser nog för att köpa in dem. Denna uppsats utforskar ifall det är möjligt att betydligt reducera kostnaden av ett sådant system genom att presentera en fungerande automatiserad 3D-scanner som är specifikt anpassad för museum. Arbetet började med en marknadsanalys som identifierade kraven som museum ställer på denna typ av system samt en analys av tillgängliga system på marknaden och hur museum använder dessa. Resultatet av detta arbete var att en specifik typ av automatiserad 3D-scannar lämplig för anpassning identifierades. Utifrån kraven som identifierades genom marknadsanalysen så utvecklades sedan en mekanisk och elektrisk design för systemet. Dessa användes sedan för att bygga och utvärdera en begränsad prototyp i syfte att validera den mekaniska och elektriska designen. Resterande arbete bestod av en kostnadsanalys som använde den mekaniska och elektriska designen för att utvärdera material och komponentkostnaden för att bygga en enhet av det utvecklade systemet. Slutsatsen av arbetet i denna uppsats är att det är troligt att det blir billigare för museum att köpa denna typ av system ifall de utvecklas utifrån deras specifika behov jämfört med tillgängliga system på marknaden.
Llau, Antoine. "Méthodes de simulation du comportement mécanique non linéaire des grandes structures en béton armé et précontraint : condensation adaptative en contexte aléatoire et représentation des hétérogénéités." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI029/document.
Full textLarge-scale concrete and reinforced concrete structures, and in particular containment buildings, may undergo localized cracking when they age or endure strong loadings (LOCA for instance). In order to optimize the maintenance actions, a predictive model of concrete damage is required. This phenomenon takes place at a rather small material scale and a predictive model requires a refined mesh and a nonlinear constitutive law. This type of modelling cannot be applied directly on a large-scale civil engineering structure, as the computational load would be too heavy for the existing machines.A simulation method is proposed to focus the computational effort on the areas of interest (damaged parts) of the structure while eliminating the undamaged areas. It aims at using the available computing power for the characterization of crack properties in particular. This approach uses Guyan’s static condensation technique to reduce the elastic areas to a set of boundary conditions applied to the areas of interest. When the system evolves, a set of criteria allows to promote on the fly the elastic areas to areas of interest if damage appears. This adaptive condensation technique allows to reduce the dimension of a nonlinear problem without degrading the quality of the results when compared to a full reference simulation.However, a classical modelling does not allow to take into account the various unknowns which will impact the structural behaviour: mechanical properties, geometry, loading… In order to better characterize this behaviour while taking into account the various uncertainties, the proposed adaptive condensation method is coupled with a stochastic collocation approach. Each deterministic simulation required for the characterization of the uncertainties on the structural quantities of interest is therefore reduced and the pre-processing steps necessary to the condensation technique are also reduced using a second collocation. The proposed approach allows to produce for a reduced computational cost the probability density functions of the quantities of interest of a large structure.The proposed calculation strategies give access at the local scale to a modelling finer than what would be applicable to the full structure. In order to improve the representativeness at this scale, the tridimensional effects of the heterogeneities must be taken into account. In the civil and nuclear engineering field, one of the main issues is the modelling of prestressing tendons, usually modelled in one dimension. A new approach is proposed, which uses a 1D mesh and model to build a volume equivalent to the tendon and redistribute the forces and stiffnesses in the concrete. It combines the representativeness of a full conform 3D modelling of the tendon when the mesh is refined and the ease of use of the 1D approaches.The applicability of the proposed methodologies to a large-scale civil engineering structure is evaluated using a numerical model of a 1/3 mock-up of a double-wall containment building of a PWR 1300 MWe nuclear reactor
Liu, Chao Yuan. "Analyse quantitative des propriétés mécaniques de fraises dentaires rotatives en NiTi et étude de la fabrication de larges microstructures par polymérisation induite à deux photons." Phd thesis, Université de Grenoble, 2014. http://tel.archives-ouvertes.fr/tel-01071805.
Full textJaber, Jana. "Application de la fabrication additive à la modélisation physique des joints et des massifs rocheux, par approches expérimentales et numériques." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0071.
Full textThis thesis presents a study of the application of additive manufacturing (known as 3D printing) to rock mechanics. It is part of a larger project aimed at building a 2m3 physical model of an explicit discontinuous rock mass, whose behaviour is mainly controlled by discontinuities. The 3DP technology adopted in this work is selective laser sintering, and the material is Polyamide 12. First, we present the experimental results of the mechanical characterization of artificial rock joints constructed by 3DP. Two joint families are tested. The first is characterized by a fixed aperture (0,4mm), a simplified geometry (planar or sawtooth), and containing rock bridges. The mechanical characterization shows that these joints exhibit a mechanical behavior similar to that of natural rock joints under shear tests, with a cohesion driven by the rock bridges, and a friction angle which depends on the angle of the asperities. The second family consists of joints with more realistic roughnesses, to which a JRC value, commonly used to describe natural joints, can be assigned. Again, experimental results show the potential of artificial joints to reproduce the mechanical behavior of natural joints, and to respect the Barton-Bandis criterion. Experimental studies are coupled with numerical modeling, using the UDEC software, to define the appropriate model that reproduces the experimental results, and to calibrate the mechanical parameters of both joints type. After defining different artificial joints with controlled parameters, cylindrical samples (16 x 32 cm) containing two and eight planar discontinuities with rock bridges are printed and tested under uni-axial compression. This is a first attempt at an explicitly discontinuous physical model containing joints with controlled mechanical behaviour. The mechanical behavior of these samples highlights the influence of discontinuities in controlling the global behavior and resistance of rock masses. The results are then compared to a numerical modeling under 3EDC. Finally, scaling laws are applied to the previous results. The application of scale factors to the experimental results shows the possibility of representing natural rock mass and rock joints with artificial 3DP joints (SLS technique) up to a scale factor on metric dimensions of 1/25
Page, Marine. "Création d'objets mats : optimisation d’un procédé d’impression en relief en termes d’apparence." Thesis, Paris, CNAM, 2018. http://www.theses.fr/2018CNAM1204/document.
Full text2.5D printing is between traditional color printing, for the process and its visual quality, and 3D printing, which makes forms and reliefs by ink superposition. Because of its properties, 2.5D printing could allow the realistic reproduction of objects and surfaces, but inks are too glossy. To reduce and control this glossy aspect of inks, we modulate the roughness of the printed layers, at the micro-scale, both in frequency and amplitude. Influence of parameters was measured, and different strategies were suggested to reduce sparkle and to allow the creation of matte colored layers: by constituting a 5D space where gloss and color are modeled, we can make gloss level of colored surfaces uniform.Several case studies form the Conservation of Cultural Heritage were considered, where 2.5D printing could help the curator, the conservator or the archivist. We studied in particular the issues of the the gap filling on an archaeological object, the realistic reproduction of surfaces, and the creation of matte objects for readability
Lodato, Guido. "Conditions aux limites tridimensionnelles pour la simulation directe et aux grandes échelles des écoulements turbulents : modélisation de sous-maille pour la turbulence en région de proche paroi." Phd thesis, INSA de Rouen, 2008. http://tel.archives-ouvertes.fr/tel-00585227.
Full textKnychala, Tucci Thadeu. "Distributed algorithms for programmable matter : target shape description and self-assembly planning." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD028.
Full textProgrammable matter can be seen as a huge modular robot in which each module can communicate to its connected neighbors and work all together to achieve a common goal, more likely changing the shape of the whole robot and adapting it with new functionalities.In order to achieve coordination between a group with many thousand robots, local rules and distributed algorithms would take advantage in this environment. In the same way, small modules means there is also small resources and algorithms should be designed to reflect these needs.This thesis provide algorithms and solutions to solve some parts of the self-reconfiguration problem with each module embedding the same algorithm and coordinating with the others by means of neighbor-to-neighbor communication. One of them is a study and proposal of a representation for the goal structure that reduces the footprint memory. Also, the self-assembly like self-reconfiguration is composed of two steps:(1) identifying the free positions that are available for docking and (2) moving and docking modules to these positions. In this thesis, distributed solutions for the first step are presented which can decide positions that can be filled and can create any 3D shape, including shapes with internal holes and concavities
Sahare, Swapnil Ashok. "Enhancing the Photovoltaic Efficiency of a Bulk Heterojunction Organic Solar Cell." TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1609.
Full textMårtensson, Oskar. "LHCb Upstream Tracker box : Thermal studies and conceptual design." Thesis, Umeå universitet, Institutionen för fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-116163.
Full textLHC (Large Hadron Collider) kommer under åren 2019-2020 att ha ett längre driftstopp. Under detta driftstopp så kommer LHC's injektionsanordningar att uppgraderas för att kunna sätta fler protoner i circulation i LHC, och därmed öka antalet partikelkollisioner per tidsenhet. Denna uppgradering kommer att vara första steget i "High Luminocity LHC"-programmet som kommer att realiseras år 2024-2026. LHCb-experimentet, vars främsta syfte är att studera CP-brott, kommer också att uppgraderas under stoppet 2019-2020. Framför allt så ska avläsningsfrekvensen ökas från dagens 1MHz till 40MHz, och experimentet ska förberedas för de högre strålningsdoser som kommer att bli aktuella efter stoppet 2024-2026. En av LHCb's deldetektorer, TT detektorn, kommer att bytas ut mot en ny deldetektor som kallas UT. Den här rapporten presenterar den förberedande designen av den låda som ska isolera UT från dess omgivning och försäkra optimala förhållanden för detektorn. Kraven på den isolerande lådan och tillvägagångssätt för att uppfylla dessa krav presenteras.
LHCb, LS2 and LS3 Upgrade