To see the other types of publications on this topic, follow the link: Rapid prototyping. Simulation methods.
Dissertations / Theses on the topic 'Rapid prototyping. Simulation methods'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 44 dissertations / theses for your research on the topic 'Rapid prototyping. Simulation methods.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Partain, Seth Collins. "Fused deposition modeling with localized pre-deposition heating using forced air." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/partain/PartainS0507.pdf.
Full text
2
Tiedt, Holger. "Virtuelle Qualitätsbewertung grossflächiger Karosserie-Anbauteile durch Simulation von Funktionseinflüssen an digital rekonstruierten Bauteilen /." Aachen : Shaker, 2009. http://d-nb.info/997987316/04.
Full text
3
Lüder, Stephan, Marcel Graf, Birgit Awiszus, Thoufeili Taufek, and Yupiter HP Manurung. "Methoden und Herausforderungen bei der numerischen Simulation des selektiven Laserschmelzens (SLM)." Technische Universität Chemnitz, 2019. https://monarch.qucosa.de/id/qucosa%3A34096.
Full textAbstract:
Additive Fertigungsverfahren stellen in den letzten Jahren einen Megatrend dar, da sich mit diesen Verfahren endkonturnahe Werkstücke mit hohem Materialausnutzungsgrad herstellen lassen. Die auch als 3D-Druck bekannt gewordenen additiven Fertigungsverfahren sind jedoch nicht auf die Prototypenfertigung aus Kunststoffen begrenzt. Beim selektiven Laserschmelzen werden metallische Werkstoffe im Pulverbettverfahren mittels Laserstrahl aufgeschmolzen und somit schichtweise aufgebaut. Das Verfahren findet bereits in der Luft- und Raumfahrt, der Medizintechnik, aber auch in der Automobilindustrie und im Maschinenbau Anwendung für Prototypen, Einzelanfertigungen oder Kleinstserien. Des Weiteren ermöglicht es auch die Herstellung von Werkstücken mit besonders hoher Komplexität, die mit spanenden Verfahren nicht herstellbar sind, und bietet dadurch neue Gestaltungsmöglichkeiten bei der Konstruktion.
Innerhalb des Vortrags werden nach der Vorstellung des Verfahrens verschiedene Methoden zur numerischen Simulation des selektiven Laserschmelzens von Edelstahl (1.4404) am Beispiel der kommerziellen Software Simufact Additive erläutert. Dazu werden der mechanische und thermo-mechanische Lösungsansatz betrachtet sowie die Methode zur Kalibrierung der Simulationen erläutert. Die Erläuterung eines voll transienten thermo-mechanischen Ansatzes erfolgt unter Verwendung der Software MSC Marc.
Des Weiteren wird der Einfluss der Orientierung des Werkstücks im Herstellungsprozess auf resultierende Spannungen, Verzug sowie mechanische Eigenschaften analysiert und mit experimentellen Untersuchungen untersetzt.
4
Quintas, Figueiredo de Barros Alexandra Maria. "Formal methods for rapid software prototyping." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244903.
Full text
5
Turner-Smith, Edward Alan. "A rapid prototyping environment for computational engineering simulation." Thesis, Swansea University, 2002. https://cronfa.swan.ac.uk/Record/cronfa42915.
Full textAbstract:
This thesis investigates the design and development of an environment for computational engineering simulations with the aim of providing rapid prototyping capabilities. The Parallel Simulation User Environment was developed under a number of projects including CAESAR, MEDUSA and JULIUS, which were funded by the EC under the ESPRIT initiative. This thesis focuses on the author's efforts to harness a collection of computational simulation tools and produce a seamless integrated environment. Some of the main software tools developed by the author include graphical user interfaces, application integration modules and communication libraries.
6
Chan, Mei-mei Amy. "An integrated system for virtual simulation and visualization of rapid prototyping /." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23829655.
Full text
7
Wang, Yu. "Efficient modeling methods for freeform objects /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20WANG.
Full text
8
Sager, Benay. "Stereolithography Characterization for Surface Finish Improvement: Inverse Design Methods for Process Planning." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-04092006-155545/.
Full textAbstract:
Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2006.<br>Dr. David W. Rosen, Committee Chair ; Dr. Farrokh Mistree, Committee Member ; Dr. W. Jack Lackey, Committee Member ; Dr. Cliff Henderson, Committee Member ; Dr. Ali Adibi, Committee Member.
9
Cheung, Hoi-hoi, and 張凱凱. "A versatile multi-material virtual prototyping system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B3931988X.
Full text
10
Puthoff, Frederick Anthony. "The model analyzer : prototyping the diagnosis of discrete-event simulation model specifications /." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10102009-020137/.
Full text
11
DiMino, John Robert. "Fabrication of a SWATH vessel scale model for seakeeping tests using rapid prototyping methods." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83709.
Full textAbstract:
Thesis (S.B. in Mechanical and Ocean Engineering)--Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis. Vita.<br>Includes bibliographical references (page 26).<br>This paper describes the techniques used to fabricate a one meter long, 1/6 scale model of a Small Waterplane Area, Twin Hull (SWATH) Unmanned Surface Vehicle (USV) that will be used primarily for dynamic seakeeping testing in the MIT Tow Tank. The model represents a design conceived by Stefano Brizzolara, which will be used for launching, recovering, and servicing Unmanned Underwater Vehicles (UUV) at sea. Construction methods included a number of rapid prototyping methods rarely used for this kind of project, including 3D printing, lasercutting, and spraypainting. The benefits and disadvantages of each of these processes will be discussed. Although there was insufficient time to conduct any tow tank tests, several data-recording techniques are reviewed which may be used by future students continuing the research of this vessel.<br>by John Robert DiMino.<br>S.B.in Mechanical and Ocean Engineering
12
Redfearn, Brady Edwin. "Rapid Design and Prototyping Methods for Mobile Head-Worn Mixed Reality (MR) Interface and Interaction Systems." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/82056.
Full textAbstract:
As Mixed Reality (MR) technologies become more prevalent, it is important for researchers to design and prototype the kinds of user interface and user interactions that are most effective for end-user consumers. Creating these standards now will aid in technology development and adoption in MR overall. In the current climate of this domain, however, the interface elements and user interaction styles are unique to each hardware and software vendor and are generally proprietary in nature. This results in confusion for consumers.
To explore the MR interface and interaction space, this research employed a series of standard user-centered design (UCD) methods to rapidly prototype 3D head-worn display (HWD) systems in the first responder domain. These methods were performed across a series of 13 experiments, resulting in an in-depth analysis of the most effective methods experienced herein and providing suggested paths forward for future researchers in 3D MR HWD systems.
Lessons learned from each individual method and across all of the experiments are shared. Several characteristics are defined and described as they relate to each experiment, including interface, interaction, and cost.<br>Ph. D.
13
Burningham, Julie Ann. "A Simulation-based Approach to Educational Psychology." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2140.
Full textAbstract:
This paper summarizes a design project entitled "Choose Your Own Teaching Adventure" completed for the Instructional Psychology and Technology Department at Brigham Young University. The purpose of the design project was to prototype a learning tool that instructs beginning pre-service teachers in the classroom application of the principles of behaviorism. Originally, the project was designed to be a static learning object that would be combined with other similar learning modules for additional topics of an Educational Psychology course. At the conclusion of the first prototyping round, however, the project was generalized to become a testing ground for a simulation builder project that would allow other instructors to create their own learning simulation based on the findings of this prototype. The Rapid Prototyping methodology used in this project allowed for quick revisions, lower stakes testing, and more flexibility in the design. The various stages of the design and evaluation process, including revisions and prototypes, are shown and discussed in this paper.
14
Price, Jeremy C., and Michael S. Moore. "NETGEN: A MODEL-DRIVEN TOOL FOR RAPID PROTOTYPING AND SIMULATION OF NETWORK-BASED FLIGHT TEST SYSTEMS." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604528.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>When network-centric flight test system components are developed concurrently, it is necessary
to produce relevant simulated network traffic for exercising the network devices and other
processing subsystems prior to system integration. Having an accurate and repeatable pattern of
simulated network traffic is extremely important for debugging and subsystem integration. The
simulated network traffic must be both representative of the real system and repeatable to aid test
efforts. Our solution to this problem was to develop a model-driven network traffic generator –
NETGEN. Using NETGEN to resolve errors, stress test, and verify requirements, we have
achieved otherwise unattainable correctness, reliability, and success in our systems.
15
Gupta, Vikas. "Development of an object-oriented modeling environment for prototyping heterogeneous simulation models." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42133.
Full textAbstract:
<p>Computer simulation modeling is currently the most flexible method of manufacturing system
analysis. Unfortunately, current simulation frameworks do not support the modular specification of homogeneous and heterogeneuos models.</p>
<p>
A Simulation Program Generator (SPG) for prototyping heterogeneuos simulation models is
developed. Objects in the model represent elements within a flexible assembly system.
These elements are the robot, the conveyor, the part, the schedule plan and the robot program.
These objects were modeled using the GIBSS simulation framework.</p>
<p>
A model base and an user interface is developed to allow the construction and execution of
simulation models. Instances of the objects are created and stored into the model base.
These are retrieved later to construct a model The user interface is provided with an extensive
set of tools for model creation and execution. Icons. representing objects, are selected
and placed on the terminal screen and then connected together by interaction lines to create
the complete model. The attributes of the objects can be altered and viewed on their respective
panes.</p>
<p>
The SPG is a step forward in the development of computer-aided manufacturing system design
environments for prototyping heterogeneous models. It allows the rapid generation and
execution of simulation models.</p><br>Master of Science
16
Cai, Yi, and 蔡毅. "A virtual prototyping system with reconfigurable manipulators for layered manufacturing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47046144.
Full text
17
Armstrong, Dean Andrew. "Easing the Transition from Inspiration to Implementation: A Rapid Prototyping Platform for Wireless Medium Access Control Protocols." The University of Waikato, 2007. http://hdl.handle.net/10289/2528.
Full textAbstract:
Packet broadcast networks are in widespread use in modern wireless communication systems. Medium access control is a key functionality within such technologies. A substantial research effort has been and continues to be invested into the study of existing protocols and the development of new and specialised ones. Academic researchers are restricted in their studies by an absence of suitable wireless MAC protocol development methods. This thesis describes an environment which allows rapid prototyping and evaluation of wireless medium access control protocols. The proposed design flow allows specification of the protocol using the specification and description language (SDL) formal description technique. A tool is presented to convert the SDL protocol description into a C++ model suitable for integration into both simulation and implementation environments. Simulations at various levels of abstraction are shown to be relevant at different stages of protocol design. Environments based on the Cinderella SDL simulator and the ns-2 network simulator have been developed which allow early functional verification, along with detailed and accurate performance analysis of protocols under development. A hardware platform is presented which allows implementation of protocols with flexibility in the hardware/software trade-off. Measurement facilities are integral to the hardware framework, and provide a means for accurate real-world feedback on protocol performance.
18
Nigania, Nimit. "FPGA prototyping of custom GPGPUs." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51966.
Full textAbstract:
Prototyping new systems on hardware is a time-consuming task with limited scope for architectural exploration. The aim of this work was to perform fast prototyping of general-purpose graphics processing units (GPGPUs) on field programmable gate arrays (FPGAs) using a novel tool chain. This hardware flow combined with the higher level simulation flow using the same source code allowed us to create a whole tool chain to study and build future architectures using new technologies. It also gave us enough flexibility at different granularities to make architectural decisions. We will also discuss some example systems that were built using this tool chain along with some results.
19
Burrell, Frances. "Development of numerical simulation methods to support emerging rapid and automated radioanalytical techniques." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/421111/.
Full textAbstract:
The global demand for radiological characterisation of a vast range of sample matrices as well as the pressure to improve emergency preparedness has led to the emergence of novel rapid and automated techniques. For radioanalytical procedures involving the separation and isolation of difficult to measure nuclides, a particular focus has been on the use of pumps or pressure gradients to accelerate the flow of solutions through a chromatographic column. The introduction of elevated flow rates as well as changing procedural specifications due to advances in detection method, shifts in nuclide detection levels required for dose assessments and growing interest in unusual matrices has contributed to the need for new or modified radioanalytical methods. The development and validation of methods can involve a large volume of experimental work and is often hindered by a lack of certified reference materials and isotopic tracers. The development of software to simulate chromatographic breakthrough and elution profiles would therefore be a useful tool in method development and validation as well as in support of routine radiological analysis using automated separation techniques. This thesis details the development of a numerical simulation method for modelling chromatographic breakthrough. A mechanistic and modular approach has been followed based on the numerical solution of ordinary differential equations to describe concentration change with respect to time. The method was first developed to describe the batch sorption and desorption of analytes and then applied to a packed bed geometry under a range of operating conditions. The proposed numerical simulation method shows great potential for the prediction of elution profiles from any chromatographic system provided the correct input parameters are defined.
20
Kosour, Vojtěch. "Technologie rychlého prototypování za použití metody FDM a současně technologie vytavitelného modelu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228152.
Full textAbstract:
An overview of the development of the Investment Casting market and Rapid Prototyping equipment is given in the introductory part of this diploma thesis. Basic methods of rapid prototyping and the FDM method are futher described in detail. The FDM method is consequently used in the practical part of this work for the preparation of the silicon mould. The largest part deals with the issue of the simulation of pouring process of wax into the silicon mould. A characteristics of the casting wax is made; the parametres, which are inserted into the simulation software ProCAST and the possibilities of their measurement are described. The process of the simulation of the mould filling and its validation with the real filling process are described in detail.
21
Taylor, Richard E. "A design tool for use in simulation and training of sinus surgery." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7294.
Full textAbstract:
The traditional approaches to training surgeons are becoming increasingly difficult to apply to modern surgical procedures. The development of Minimally Invasive Surgery (MIS) techniques demands new and complex psychomotor skills, and means that the apprentice-based system described by 'see one, do one, teach one' can no longer be expected to fully prepare surgeons for operations on real patients, placing patient safety at risk. The use of cadavers and animals in surgical training raises issues of ethics, cost and anatomical similarity to live humans. Endoscopic sinus surgery involves further risk to the patient due to the proximity of vital structures such as the brain, eyes, optic nerve and internal carotid artery. In recent years, simulation has been used to overcome these problems, exposing surgeons to complex procedures in a safe environment, similarly to its use in aviation. However, the cases simulated in this manner may not be customised by training staff to present desired pathology. This thesis describes the design and development of a new tool for the creation of customised cases for the training of sinus surgery. Users who are inexperienced and non-skilled in the use of three-dimensional (3D) Computer Aided Design (CAD) modelling software may use the tool to implement pathology to the virtual sinus model, which was constructed from real CT data. Swelling is applied in five directions (four horizontal, one vertical) to the cavity lining of the frontal and sphenoid sinuses. Tumours are individually customised and positioned in the frontal, sphenoid and ethmoid sinuses. The customised CAD model may then be latterly manufactured using Three-Dimensional Printing (3DP) to produce the complex anatomy of the sinuses in a full colour physical part for the realistic simulation of surgical procedures. An investigation into the colouring of the physical model is also described, involving the study of endoscopic videos to ascertain realistic shades. The program was evaluated by a group of medical professionals from a range of fields, and their feedback was taken into account in subsequent redevelopment of the program, and to suggest further work.
22
Berg, Gregor. "Virtual prototypes for the model-based elicitation and validation of collaborative scenarios." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/6972/.
Full textAbstract:
Requirements engineers have to elicit, document, and validate how stakeholders act and interact to achieve their common goals in collaborative scenarios. Only after gathering all information concerning who interacts with whom to do what and why, can a software system be designed and realized which supports the stakeholders to do their work. To capture and structure requirements of different (groups of) stakeholders, scenario-based approaches have been widely used and investigated. Still, the elicitation and validation of requirements covering collaborative scenarios remains complicated, since the required information is highly intertwined, fragmented, and distributed over several stakeholders. Hence, it can only be elicited and validated collaboratively. In times of globally distributed companies, scheduling and conducting workshops with groups of stakeholders is usually not feasible due to budget and time constraints. Talking to individual stakeholders, on the other hand, is feasible but leads to fragmented and incomplete stakeholder scenarios. Going back and forth between different individual stakeholders to resolve this fragmentation and explore uncovered alternatives is an error-prone, time-consuming, and expensive task for the requirements engineers. While formal modeling methods can be employed to automatically check and ensure consistency of stakeholder scenarios, such methods introduce additional overhead since their formal notations have to be explained in each interaction between stakeholders and requirements engineers. Tangible prototypes as they are used in other disciplines such as design, on the other hand, allow designers to feasibly validate and iterate concepts and requirements with stakeholders.
This thesis proposes a model-based approach for prototyping formal behavioral specifications of stakeholders who are involved in collaborative scenarios. By simulating and animating such specifications in a remote domain-specific visualization, stakeholders can experience and validate the scenarios captured so far, i.e., how other stakeholders act and react. This interactive scenario simulation is referred to as a model-based virtual prototype. Moreover, through observing how stakeholders interact with a virtual prototype of their collaborative scenarios, formal behavioral specifications can be automatically derived which complete the otherwise fragmented scenarios. This, in turn, enables requirements engineers to elicit and validate collaborative scenarios in individual stakeholder sessions – decoupled, since stakeholders can participate remotely and are not forced to be available for a joint session at the same time. This thesis discusses and evaluates the feasibility, understandability, and modifiability of model-based virtual prototypes. Similarly to how physical prototypes are perceived, the presented approach brings behavioral models closer to being tangible for stakeholders and, moreover, combines the advantages of joint stakeholder sessions and decoupled sessions.<br>Anforderungsingenieure erheben, dokumentieren und validieren wie Bedarfsträger in einzelnen und gemeinsamen Aktivitäten die Ziele ihrer kollaborativen Szenarios erreichen. Auf Grundlage von Angaben darüber, wer warum mit wem zusammen was erledigt, kann anschließend ein Softwaresystem spezifiziert und umgesetzt werden, welches die Bedarfsträger bei der Durchführung ihrer Abläufe unterstützt. Um Anforderungen verschiedener (Gruppen von) Bedarfsträger zu erfassen und zu strukturieren, werden szenariobasierte Ansätze genutzt und erforscht. Die Erhebung und Validierung von Anforderungen, die kollaborative Szenarios abdecken, ist dennoch kompliziert, da derartige Informationen hochgradig verknüpft, fragmentiert und über mehrere Bedarfsträger verteilt sind, wodurch sie nur in Gruppensitzungen effizient erhoben und validiert werden können. In Zeiten global verteilter Firmen ist die Planung und Durchführung solcher Workshops mit Gruppen von Bedarfsträgern nur selten praktikabel. Mit einzelnen Bedarfsträgern zu sprechen ist hingegen oft realisierbar, führt aber zu fragmentierten, unvollständigen Szenariobeschreibungen. Durch eine Vielzahl von Einzelgesprächen mit wechselnden Bedarfsträgern kann diese Fragmentierung aufgelöst werden – dies ist aber eine fehleranfällige und zeitaufwändige Aufgabe. Zwar bieten formale Modellierungsmethoden z.B. automatische Konsistenzchecks für Szenarios, doch führen derartige Methoden zu Mehraufwand in allen Gesprächen mit Bedarfsträgern, da diesen die verwendeten formalen Notationen jedes Mal erläutert werden müssen. Handfeste Prototypen, wie sie in anderen Disziplinen eingesetzt werden, ermöglichen es Designern, ihre Konzepte und erhobenen Anforderungen ohne viel Aufwand mit Bedarfsträgern zu validieren und zu iterieren.
In dieser Dissertation wird ein modellbasierter Generierungsansatz vorgeschlagen, der kollaborative Szenarios prototypisch auf Grundlage von formalen Verhaltensmodellen für die beteiligten Bedarfsträger darstellt. Durch die Simulation dieses Verhaltens und dessen Animation innerhalb einer webbasierten, domänenspezifischen Visualisierung, können Bedarfsträger diese Modelle erleben und die bisher erfassten Szenarios validieren. Eine derartige interaktive Szenariosimulation wird als modellbasierter virtueller Prototyp bezeichnet. Basierend auf den Interaktionen zwischen Bedarfsträgern und einem virtuellen Prototypen ihrer Szenarios können zudem formale Verhaltensspezifikationen automatisch abgeleitet werden, die wiederum die fragmentierten kollaborativen Szenarios vervollständigen. Dies ermöglicht es den Anforderungsingenieuren, die kollaborativen Szenarios in individuellen Sitzungen mit einzelnen Bedarfsträgern zu erheben und zu validieren – entkoppelt voneinander, da Bedarfsträger webbasiert teilnehmen können und dabei nicht darauf angewiesen sind, dass andere Bedarfsträger ebenfalls in der gleichen Sitzung teilnehmen. Diese Dissertation diskutiert und evaluiert die Machbarkeit, Verständlichkeit sowie die Änderbarkeit der modellbasierten virtuellen Prototypen. Auf die gleiche Art wie physikalische Prototypen wahrgenommen werden, erlaubt es der vorgestellte Ansatz, Verhaltensmodelle für Bedarfsträger erlebbar zu machen und so die Vorteile von Gruppensitzungen mit denen entkoppelter Sitzungen zu verbinden.
23
Bücs, Róbert Lajos [Verfasser], Rainer Akademischer Betreuer] Leupers, and Antonello [Akademischer Betreuer] [Monti. "Multi-scale multi-domain co-simulation for rapid prototyping of advanced driver assistance systems / Róbert Lajos Bücs ; Rainer Leupers, Antonello Monti." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1210862964/34.
Full text
24
Stockham, Corbin H. "Rapid Tooling Carbon Nanotube-Filled Epoxy for Injection Molding Using Additive Manufacturing and Casting Methods." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1591803958920497.
Full text
25
Gempesaw, Daniel. "A multi-resolution discontinuous Galerkin method for rapid simulation of thermal systems." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42775.
Full textAbstract:
Efficient, accurate numerical simulation of coupled heat transfer and fluid dynamics systems continues to be a challenge. Direct numerical simulation (DNS) packages like FLU- ENT exist and are sufficient for design and predicting flow in a static system, but in larger systems where input parameters can change rapidly, the cost of DNS increases prohibitively. Major obstacles include handling the scales of the system accurately - some applications span multiple orders of magnitude in both the spatial and temporal dimensions, making an accurate simulation very costly. There is a need for a simulation method that returns accurate results of multi-scale systems in real time. To address these challenges, the Multi- Resolution Discontinuous Galerkin (MRDG) method has been shown to have advantages over other reduced order methods. Using multi-wavelets as the local approximation space provides an inherently efficient method of data compression, while the unique features of the Discontinuous Galerkin method make it well suited to composition with wavelet theory. This research further exhibits the viability of the MRDG as a new approach to efficient, accurate thermal system simulations. The development and execution of the algorithm will be detailed, and several examples of the utility of the MRDG will be included. Comparison between the MRDG and the "vanilla" DG method will also be featured as justification of the advantages of the MRDG method.
26
Wolff, Sebastien Jean. "Statically Stable Assembly Sequence Generation And Structure Optimization For A Large Number Of Identical Building Blocks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14045.
Full textAbstract:
This work develops optimal assembly sequences for modular building blocks. The underlying concept is that an automated device could take a virtual shape such as a CAD file, and automatically decide how to physically build the shape using simple, identical building blocks. This entails deciding where to place blocks inside the shape and generating an efficient assembly sequence that a robot could use to build the shape. The blocks are defined in a general, parameterized manner such that the model can be easily modified in the future.
The primary focus of this work is the development of methods for generating assembly sequences in a time-feasible manner that ensure static stability at each step of the assembly. Most existing research focuses on complete enumeration of every possible assembly sequence and evaluation of many possible sequences. This, however, is not practical for systems with a large number of parts for two reasons: (1) the number of possible assembly sequences is exponential in the number of parts, and (2) each static stability test is very time-consuming. The approach proposed here is to develop a multi-hierarchical rule-based approach to assembly sequences. This is accomplished by formalizing and justifying both high-level and mid-level assembly rules based on static considerations.
Application of these rules helps develop assembly sequences rapidly. The assembly sequence is developed in a time-feasible manner according to the geometry of the structure, rather than evaluating statics along the way. This work only evaluates the static stability of each step of the assembly once. The behavior of the various rules is observed both numerically and through theory, and guidelines are developed to suggest which rules to apply.
A secondary focus of this work is to introduce methods by which the inside of the structure can be optimized. This structure optimization research is implemented by genetic algorithms that solve the multi-objective optimization problem in two dimensions, and can be extended to three dimensions.
27
Costa, Maria Carolina Burgos. "Desenvolvimento de nylon-6 em unidade experimental de polimerização para aplicação em prototipagem rapida com laser de CO2." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267132.
Full textAbstract:
Orientadores: Rubens Maciel Filho, Andre Luiz Jardini<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-14T19:17:27Z (GMT). No. of bitstreams: 1
Costa_MariaCarolinaBurgos_D.pdf: 4625238 bytes, checksum: 91a8789c479692b23293ebf51336dd65 (MD5)
Previous issue date: 2009<br>Resumo: Uma característica importante no projeto de uma unidade experimental de polimerização é o fato de que, já nas primeiras etapas de síntese conceitual do processo, sejam considerados os aspectos econômicos associados ao mesmo. O potencial econômico do processo deve ser analisado para descartar alternativas inviáveis e para ordenar, segundo seu potencial de rentabilidade, as que devem seguir sendo objeto de estudo e desenvolvido em etapas posteriores. Este trabalho tem como objetivo o projeto e a implantação de uma unidade experimental de polimerização, destinada ao desenvolvimento de Nylon-6 para novas aplicações como plástico de engenharia, em especial para aplicações em processo de prototipagem rápida com laser de CO2. O processo investigado é a polimerização hidrolítica do Nylon-6, a partir do monômero e-caprolactama, em um reator de bancada em batelada. Foram identificadas as condições operacionais para obter o polímero com as propriedades desejadas, levando-se em conta as várias etapas da reação. Os estudos de modelagem e simulação do processo incluem os passos necessários para o desenvolvimento do modelo, envolvendo as equações da cinética de reação de polimerização e os balanços de massa e energia. O modelo desenvolvido é útil para otimizar o desempenho do reator experimental e, consequentemente, investigar várias alternativas operacionais, visando encontrar soluções mais econômicas para o processo. O polímero obtido a partir da planta piloto de polimerização poderá ser empregado como insumo em processos de prototipagem e em particular na máquina de prototipagem rápida, desenvolvida e instalada no Laboratório de Otimização, Projeto e Controle Avançado (LOPCA), possibilitando o desenvolvimento de protótipos e modelos tridimensionais, além de produtos com alto valor agregado.<br>Abstract: A main characteristic in the design of polymerization experimental unit is to take into consideration economic aspects already in initials stages of conceptual synthesis of the process. The economic potential of the process has to be analyzed in order to take decisions about possible alternatives so that it is possible to classify by its potential performance the options which should remain for further studies in advanced stages of process conceptual design. This research has as main objective the design, implementation and operation of an experimental polymerization unit for development of Nylon-6 especially focused for new applications as a engineer plastic - in special on its application on processes of rapid prototyping using CO2 laser. Specifically, the examined process is the hydrolytic polymerization of Nylon-6 (from e-caprolactam monomer) in a batch reactor. A search was carried out to define the process operational conditions taking into account all the reaction steps. The efforts on process modeling and simulation include the necessary paths to the model development, involving kinetic equations of polymerization reaction and the mass and energy balances. The developed model is useful to optimize the experimental reactor performance and, then, investigate several possible operational alternatives, bearing in mind the objective of establish better economic solutions for the process, whereas keeping the desired properties.<br>Doutorado<br>Desenvolvimento de Processos Químicos<br>Doutor em Engenharia Química
28
Motie, Yassine. "Interopérabilité entre dispositifs hétérogènes en environnement ouvert pour la mise en oeuvre de co-simulation." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30102.
Full textAbstract:
Le grand nombre de fonctionnalités d'appareils électroniques qu'on utilise quotidiennement entraîne le passage d'une vision centrée sur des anciennes machines multifonctions vers des appareils variées en interaction distribués et éparpillés dans l'environnement. Sachant qu'un système est un ensemble intégré d'éléments (produits, personnels, processus) connectés et reliés entre eux, en vue de satisfaire, dans un environnement donné, un ou plusieurs objectifs définis et ayant des caractéristiques comme les composants qui le constituent, les relations entre ces composants, son environnement, les contraintes qu'il subit, les évolutions au cours du temps. La combinaison de ces derniers nous conduit à qualifier certains systèmes comme étant complexes dû à l'hétérogénéité des composants les constituant, à leurs évolution à diverses échelles de temps et à leurs répartition géographique intégrant des systèmes numériques, physiques et/ou des opérateurs humains dans la boucle. La difficulté d'avoir une bonne vision du système quand il est complexe (dispositifs réels et d'autres simulés) et la probabilité d'erreur de conception importante nous amène à réfléchir sur la possibilité de spécifier le produit et vérifier la conception à l'aide d'un prototype virtuel, on parle de simulation. Quand un système complexe nécessite l'emploi de différents composants spécifiés par différents concepteurs travaillant sur des domaines différents, ceci augmente fortement le nombre de prototypes virtuels. Ces différents composants ont malheureusement tendance à demeurer trop indépendants les uns des autres empêchant ainsi à la fois les différents concepteurs de collaborer et leurs systèmes d'être interconnectés en vue de remplir une ou plusieurs tâches qui ne pourraient pas être accomplies par l'un de ces éléments seulement. Le besoin de communication et de coopération s'impose. Cela doit tenir compte des différents acteurs et les coordonner dans leurs interactions au sein de ce système complexe. Or les avancées en simulation dans chacun des domaines sont considérables, chacun disposant de ses propres logiciels. Des solutions d'interopérabilités sont donc nécessaires pour la mise en œuvre d'une co-simulation encourageant le dialogue entre les disciplines et réduisant les erreurs, le coût et le temps de développement. Dans notre thèse nous participons à la conception d'un système de co-simulation qui intègre différents outils de simulation-métiers basés sur la modélisation du comportement de dispositifs comme la simulation énergétique et la simulation d'usure de matériaux de construction au sein de la même plateforme. Après la prise en compte des notions d'architecture, de communication (entre les simulateurs ou avec les utilisateurs) et de visualisation pour définir les modèles d'architecture. Nous analysons l'architecture gérant l'interopérabilité. Nous proposons une approche d'interopérabilité se basant sur la réutilisation et l'échange de composants de calculs. Nous aborderons successivement les problématiques liées aux niveaux structurel et sémantique d'interopérabilité, aux stratégies co-simulation, aux méthodes de conception du modèle de tâches permettant la construction de composants boite noire. Puis nous présenterons la mise en application concrète de notre méthodologie de conception globale et de l'outil de vérification de certaines propriétés de l'architecture, comme la cohérence et la sémantique<br>The large number of electronic device features we use on a daily basis means a shift from a vision of old multifunction machines to distributed, widely distributed distributed devices in the environment. Knowing that a system is an integrated set of connected and interrelated elements (products, people, processes) in order to satisfy, in a given environment, one or more defined objectives and having characteristics such as the components that constitute it , the relations between these components, its environment, the constraints it undergoes, evolutions over time. The combination of these leads us to qualify some systems as complex due to the heterogeneity of the components constituting them, their evolution at various time scales and their geographical distribution integrating digital systems, physical and / or human operators in the loop. The difficulty of having a good vision of the system when it is complex (real and other simulated devices) and the probability of significant design error leads us to reflect on the ability to specify the product and verify the design using a virtual prototype, we are talking about simulation. When a complex system requires the use of different components specified by different designers working on different domains, this greatly increases the number of virtual prototypes. These different components unfortunately tend to remain too independent of each other thus preventing both the different designers from collaborating and their systems from being interconnected in order to fulfill one or more tasks that could not be accomplished by one of these elements only. The need for communication and cooperation is needed. This must take into account the different actors and coordinate them in their interactions within this complex system. But the advances in simulation in each area are considerable, each with its own software. Interoperability solutions are therefore necessary for the implementation of a co-simulation encouraging dialogue between disciplines and reducing errors, cost and development time. In our thesis we participate in the design of a co-simulation system which integrates different tools of simulation-trades based on the modeling of the behavior of devices like the simulation energetics and the simulation of wear of building materials within the same platform. After taking into account the concepts of architecture, communication (between simulators or with users) and visualization to define architecture models. We analyze the architecture that manages interoperability. We propose an interoperability approach based on the reuse and exchange of computational components. We will successively address the issues related to the interoperability structural and semantic levels, the co-simulation strategies, the design methods of the task model allowing the construction of black box components. Then we will present the concrete implementation of our global design methodology and the verification tool of some properties of the architecture, such as coherence and semantics
29
Schawohl, Elke. "Der Weg zum digitalen Zwilling mit Mainstream CAD-Lösungen." Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21533.
Full textAbstract:
Von der ersten Idee bis zur Auslieferung eines Produktes laufen verschiedene Prozesse ab, die koordiniert und optimiert werden, um Produkte schnell zur Marktreife zu entwickeln. Die Digitalisierung von Prozessen sowie eine firmenweit einheitliche Datenplattform sind in der Produktentwicklung zwingend notwendig. Digitaler Zwilling, und PLM rücken in den Fokus. Die Herausforderung der Industrie liegt in der Optimierung von Produkten. Wo beginnt die Optimierung? Während der Konstruktion greifen verschiedene Optimierungstools in die Entwicklungsphase ein. Skalierbare FEM-Tools ermöglichen konstruktionsbegleitende Analysen. Verschiedene Konstruktions-Tools in der CAD-Lösung sparen Zeit und Kosten. Die Konstruktion der nächsten Generation Generative Konstruktion – bei der Modellerzeugung werden die Vorteile der additiven Fertigung einbezogen und somit die Bauteilkonstruktion optimiert. Reverse Engineering bietet die Möglichkeit direkt mit Facettendaten zu arbeiten und Flächen zu generieren. Convergent Modeling bietet die nahtlose Kombination von „B-Rep“-Volumen und „Facetten“-Modellen. Solid Edge Portfolio - die Zukunft der Produktentwicklung Solid Edge Apps erweitern den Funktionsumfang. Auf bestimmte Marktsegmente entwickelte Applikationen runden die Anwendungsmöglichkeiten ab.
30
Ma, Yuxin. "Exploring Faculty Perceptions of a Case Library as an Online Teaching Resource." Digital Archive @ GSU, 2005. http://digitalarchive.gsu.edu/msit_diss/2.
Full textAbstract:
Professors need alternative programs to support their online teaching. This dissertation reports an initial study in a long-term research agenda for developing a faculty online teaching solution.
The primary purpose of the study is to explore faculty perceptions of a case library to help decision makers and researchers determine whether they would pursue the use of such a tool to support faculty online teaching. The secondary purpose of the study is to generate design knowledge to inform future development of and research on this or similar case libraries.
The methodology of this study includes three components: development research, rapid prototyping, and qualitative methods. Development research and rapid prototyping provided a three-stage framework for this study: conceptualization, development, and research. I synthesized the literature to create conceptual models of an Online Teaching Case Library (OTCL) at the conceptualization stage, built a prototype to implement the models at the development stage, and conducted research to evaluate the prototype at the research stage. Qualitative methods guided data gathering and analysis. I recruited seven faculty participants based on a purposeful sampling technique. To gather the data, I followed a three-step data collection process: initial interviews, contextual interviews, and final interviews. This process allowed me to observe and interview faculty participants while they were exploring the prototype. I analyzed the data by following an 11-step procedure synthesized from the works of Miles and Huberman (1994) as well as LeCompte and Schensul (1999a).
This study found that on one hand, faculty members might use an OTCL, because they perceived that this tool could support their apprenticeship approach to learning to teach. On the other hand, however, their perceived decision to use an OTCL would also be influenced by the perceptions of the usefulness and usability of the tool.
The study identified the initial evidence supporting an OTCL as an online teaching resource and the challenges involved in developing and implementing such a solution. It provides a base for decision makers to determine whether they would adopt this tool. It also offers some design guidance for those who do want to pursue this solution to faculty development.
31
Kronbauer, Fernando André. "Memorias transacionais : prototipagem e simulação de implementações em hardware e uma caracterização para o problema de gerenciamento de contenção em software." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276161.
Full textAbstract:
Orientador: Sandro Rigo<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação<br>Made available in DSpace on 2018-08-13T10:38:16Z (GMT). No. of bitstreams: 1
Kronbauer_FernandoAndre_M.pdf: 3637569 bytes, checksum: 4c5752e2ae7f853d3b5f4971d6d7cbab (MD5)
Previous issue date: 2009<br>Resumo: Enquanto que arquiteturas paralelas vão se tornando cada vez mais comuns na indústria de computação mais e mais programadores precisam escrever programas paralelos e desta forma são expostos aos problemas relacionados ao uso dos mecanismos tradicionais de controle de concorrência. Memórias transacionais têm sido propostas como um meio de aliviar as dificuldades encontradas ao escreverem-se programas paralelos: o desenvolvedor precisa apenas marcar as seções de código que devem ser executadas de forma atômica e isolada - na forma de transações, e o sistema cuida dos detalhes de sincronização. Neste trabalho exploramos propostas de memórias transacionais com suporte específico em hardware (HTM), desenvolvendo uma plataforma flexível para a prototipagem, simulação e caracterização destes sistemas. Também exploramos um sistema de memória transacional com suporte apenas em software (STM), apresentando uma abordagem nova para gerenciar a contenção entre transações. Esta abordagem leva em consideração os padrões de acesso aos diferentes dados de um programa ao escolher o gerenciador de contenção a ser usado para o acesso a estes dados. Elaboramos uma modificação da plataforma de STM que nos permite realizar esta associação entre dados e gerenciamento de contenção, e a partir desta implementação realizamos uma caracterização baseada nos padrões de acesso aos dados de um programa executando em diferentes sistemas de computação. Os resultados de nosso trabalho mostram a viabilidade do uso de memórias transacionais em um ambiente de pesquisa acadêmica, e apontam caminhos para a realização de trabalhos futuros que aumentem a viabilidade do seu uso também pela indústria.<br>Abstract: As parallel architectures become prevalent in the computer industry, more and more programmers are required to write parallel programs and are thus being exposed to the problems related to the use of traditional mechanisms for concurrency control. Transactional memory has been devised as a means for easing the burden of writing parallel
Programs: the programmer has only to mark the sections of code that are to be executed in an atomic and isolated way - in the form of transactions, and the system takes care of the synchronization details. In this work we explore different proposals of transactional memories based on specific hardware support (HTM), developing a flexible platform for the prototyping, simulation and characterization of these systems. We also explore a transactional memory system based solely on software support (STM), devising a novel approach for managing the contention among transactions. This new approach takes into account access patterns to different data in an application when choosing the contention management strategy to be used for the access to these data. We made modifications to the STM system in order to enable the association of the data with the contention manager algorithm, and using the new implementation we characterized the STM system based on the access patterns to the data of a program, running it on different hardware. Our results show the viability of the use of transactional memories in an academic environment, and serve as a basis for the proposal of different directions to be followed in future research work, aimed at leveraging the use of transactional memories by the industry.<br>Mestrado<br>Mestre em Ciência da Computação
32
Brăileanu, Patricia-Isabela. "Research on optimizing customized prostheses." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI062.
Full textAbstract:
La thèse de doctorat intitulée " Research on optimizing customized prostheses " a pour objectif final de développer un logiciel qui modifie la géométrie d'une tige fémorale en fonction de paramètres prédéterminés après l’analyse des images tomographiques du patient. Afin d'obtenir des résultats, ont été réalisées les études suivantes : Des images tomographiques ont été obtenues de patients avec une hanche saine, de patients avec une hanche arthritique et de patients avec prothèse totale de hanche ; Une planification virtuelle de l'opération de remplacement total de la hanche a été réalisée pour construire une prothèse personnalisée et identifier les paramètres qui peuvent être optimisés ; Des études FEA ont été réalisées sur les tiges prothétiques standard et sur la tige prothétique personnalisée pour observer le comportement mécanique de la prothèse sujet à différentes charges externes ; Après avoir interprété les résultats, nous avons poursuivi le développement du logiciel, son objectif sera l’impression de la tige fémorale personnalisée par la technique de fabrication additive<br>This thesis aims to develop a virtual surgery planning methodology starting from the traditional Total Hip Replacement preoperative planning and having as final goal the realization of a template prosthesis that can be customized according to the femoral landmarks of each patient. Starting from the traditional preoperative planning of THR, which is done on the patients’ X-Ray and using the same principles of obtaining femoral landmarks, the CT scans of a patient with hip joint related disease that need to undergo a THR surgery were segmented by using specific algorithms in order to extract the patients’ femur and after that was imported in dedicated CAD software in which, with the help of evaluation instruments, all the patients’ femoral landmarks were identified. These femoral landmarks were used to develop a custom prosthesis starting from a standard anatomical femoral stem, which was validated using FEA simulations. Based on the information obtained, the development of a software coded in Python language was done to create somehow a tool that allows the analysis of patients’ CT scans in MPR view, but also in 3D view. It allows the bone segmentation of the affected area in order to obtain a CAD model file and perform the virtual preoperative planning in a CAD dedicated software, and finally use some of these dimensions in order to personalize a custom hip stem based on a pre-existing stem model used as basis for the desired geometrical transformations. The work is completed by printing it with FDM technology, using a biocompatible material to demonstrate the potential of this study, the versatility and the possibility of orienting the femoral stems used in THR towards personalization and AM, avoiding the use of standard prostheses that can lead to postoperative complications and thus leading to the elimination of prostheses “banks” due to the fact that they would no longer be necessary
33
Rezende, Rodrigo Alvarenga. "Analise de parametros fisicos e operacionais no fenomeno da cura localizada do processo termolitografico da prototipagem rapida." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266294.
Full textAbstract:
Orientador: Rubens Maciel Filho<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-09T08:31:02Z (GMT). No. of bitstreams: 1
Rezende_RodrigoAlvarenga_M.pdf: 6027055 bytes, checksum: dc80f298be40be05219c739478682c4d (MD5)
Previous issue date: 2006<br>Resumo: A Prototipagem Rápida consiste na reprodução física de objetos tridimensionais de geometria livre, a partir de um projeto inicial (design), modelado por auxílio de computador. A Prototipagem Rápida é uma tecnologia moderna que une métodos e equipamentos adequados a fim de oferecer, como principais atrativos, alta qualidade e redução de custos de produtos manufaturados. São diversos os métodos existentes e os materiais aplicáveis. Este trabalho apresenta um novo método de fabricação de protótipos, a Termolitografia. Baseada na irradiação de laser de CO2 na região espectral do
infravermelho sobre resinas termossensíveis, a Termolitografia oferece importantes vantagens quando comparada a outros processos, principalmente no que se refere ao estado físico da amostra logo após a irradiação do laser. Este processo apresenta duas grandes vantagens que são a não-contração da amostra após ser curada e a ausência de tratamento
pós-cura. A cura localizada é o fenômeno de confinamento da energia transmitida pelo laser realizando a cura do material somente em uma região desejada. O controle da cura localizada é a chave para o sucesso e para a garantia de protótipos de alta qualidade. Para ajustá-la e otimizá-la, é necessário o domínio de parâmetros físicos do material empregado
e de parâmetros operacionais do laser de CO2. O estudo da combinação dos efeitos, por exemplo, da variação da proporção dos componentes da amostra, da sua temperatura de cura, além de fatores operacionais como a velocidade de varredura, o diâmetro e a potência do feixe laser, é o alvo principal deste trabalho. As simulações facilitam a compreensão de
como cada variável pode interferir na construção do protótipo, e determinam faixas de valores para os parâmetros as quais implicam em melhores resultados no final do processo. O trabalho de seleção destes valores é importante para a futura continuidade de estudo experimental do processo termolitográfico<br>Abstract: Rapid Prototyping consists on a physical replication of three-dimensional objects with free geometry, from an initial design, modeled by computer assistance. Rapid Prototyping is a modern technology that unifies methods and suited equipments in order to offer as main attractive high quality and cost-reduction of manufactured products. There are many
techniques and raw materials applicable. This work presents a new method of prototypes fabrication, the Termolithography. Based on CO2 laser irradiation at the infrared spectral region onto thermosensitive resins, Thermolithography offers important advantages if compared with other processes, mainly those ones respected to the non-contraction effect of
the sample after being cured and the absence of a post cure treatment. The localized cure is the phenomenon of confinement of energy transmitted by laser beam performing the curing only on a desired region at the sample. The control of the localized cure is the key for the success and for the guarantee of high quality prototypes. In order to fit and optimize it, it is
necessary the domain of physical properties of the applied material and the domain of the CO2 laser operational parameters. The study of combination of the involved effects, for instance, the variation of amount of the components in the sample, the cure temperature, beside operational parameters as scanning velocity, the laser beam diameter and power, are the main target of this work. Simulations become easier the comprehension of how each variable can affect during the building of prototype and to determine the best range of values which implicate in better final result of the process. The selection of these values is
very important to the continuity of this work<br>Mestrado<br>Desenvolvimento de Processos Químicos<br>Mestre em Engenharia Química
34
Lind, Amelia. "3D-simulering : Möjligheten med ett förändrat arbetssätt vid implementering av CLO3D." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-26567.
Full textAbstract:
Denna studie undersöker den möjliga förändring som kommer ske när 3D-simulering som arbetssätt får ta en allt större plats i en textil produktframtagningsprocess. Detta genom att besvara om det finns en marknad och ett intresse för ett förändrat arbetssätt. Undersöka vilka för- och nackdelar ett arbetssätt av implementerad 3D har. Samt utforska hur branschens yrkesroller kommer påverkas av detta. Situationen av COVID-19 har påvisat hur sårbar en produktframtagningsprocess på andra sidan jorden är i en global kris och därmed har intresset för ett arbetssätt av 3D ökat. Studien bedrivs med en abduktiv metod av kvalitativa undersökningar i form av fokusgrupp och intervjutillfälle. Rapportens resultat påvisar att marknaden är öppen och angelägen för ett nytt arbetssätt i form av 3D-baserad produktutveckling. COVID-19 har varit en bromskloss för många företag inom textilbranschen vilket har lett till ett ökat intresse och öppenheten för implementeringen av 3D. Efterfrågan och intresset av 3D-kompetens ses även på de utbildningar i programvaran CLO3D som redan från första terminsstart drevs med överfulla klasser. Implementerad 3D ses som det nya och framtida sätt att uppnå en mer effektiv och lättlöpande arbetsprocess.<br>This study examines the possible change that will take place when 3D-simulation will take a major place in a textile product development process. This by answering whether there is a market for a changed way of working. Investigate the advantages and disadvantages of an implemented 3D approach. And explore how the industry's professional roles will be affected by it. COVID-19 has shown how vulnerable a product development process on the other side of the world becomes in a global crisis and because of that the interest of 3D has increased. The study is conducted with an abductive method of qualitative research methods in the form of a focus group and an interview. The report's results show that the market is open for a new way of working in the form of implement 3D. The prevailing pandemic has led to a more open sight for implementing 3D. The demand and interest in 3D-competence has also been seen in the course of CLO3D software that from the first semester start with overfull classes. Implemented 3D is seen as the new way to achieve a more efficient and flexible work process.
35
Bellet, Thomas. "Transformations de graphes pour la modélisation géométrique à base topologique." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2261/document.
Full textAbstract:
De nombreux domaines comme le jeu vidéo, l’architecture, l’ingénierie ou l’archéologie font désormais appel à la modélisation géométrique. Les objets à représenter sont de natures diverses, et leurs opérations de manipulation sont spécifiques. Ainsi, les modeleurs sont nombreux car tous spécialisés à leur domaine d’application. Or ils sont à la fois chers à développer, souvent peu robustes, et difficilement extensibles. Nous avons proposé dans la thèse l’approche alternative suivante :– fournir un langage dédié à la modélisation qui permet de définir les opérations quelque soit le domaine d’application ; dans ce langage, les objets sont représentés avec le modèle topologique des cartes généralisées, dont nous avons étendu la définition aux plongements ; les opérations sont elles définies par des règles de transformation de graphes, issues de la théorie des catégorie ;– garantir les opérations définies dans le langage à l’aide de conditions de cohérence ; une opération dont la définition vérifie ces conditions ne produit pas d’anomalie ;– développer un noyau de modeleur générique qui interprète ce langage ; les opérations définies sont directement appliquées dans le modeleur, sans implantation dans un langage de programmation ; l’outil assure également la vérification automatique des conditions du langage pour prévenir un utilisateur lorsqu’il propose une opération incohérente.Le langage et le modeleur développés se sont révélés performants à la fois en termes de temps de développement et en termes de temps machine. L’implantation d’une nouvelle opération par une règle ne prend que quelques minutes à l’aide des conditions du langage, au contraire de l’approche classi<br>Geometric modeling is now involved in many fields such as: video games, architecture, engineering and archaeology. The represented objects are very different from one field to another, and so are their modeling operations. Furthermore, many specific types of modeling software are designed for high programing costs, but with a relatively low rate of effectiveness.The following is an alternative approach:– we have conceived a dedicated language for geometric modeling that will allow us to define any operation of any field; objects in this language are defined with the topological model of generalized maps, this definition has been extended to the embedding informations; here the operations are defined as graph transformation rules which originate from the category theory;– we have ensured operation definitions with consistency conditions; these operations that satisfy those conditions do not generate anomalies; – we have designed generic modeling software to serve as an interpreter of this language; the operation definitions are directly applied without the need for more programing; the software also automatically checks the language conditions and warns the user if he designs a non-consistent operation.The provided language and software prove to be efficient, and all for a low programing cost. Designing a new operation takes only minutes thanks to the language conditions, as opposed to hours of programming and debugging with the past approach
36
Chang, Sen-Chyau, and 張森喬. "Real-Time Simulation and Rapid Prototyping for Spacecraft Attitude Control." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/48425847705348112415.
Full textAbstract:
碩士<br>國立成功大學<br>電機工程學系<br>88<br>The attitude control is necessary to position accurately for spacecraft. To increase the accuracy of the attitude, an attitude controller is needed. In addition, a real-time dynamic simulation of spacecraft attitude is often necessary to verify the design. The process of attitude control development is time consuming and costly. In this thesis, a rapid prototyping approach is applied to perform real-time dynamic simulation quickly and effectively. With the capability of the rapid prototyping, each task of the attitude control and simulation such as controller design, simulation, implementation, and testing can be conducted more effectively and thus the development time can be reduced. In this thesis, the spacecraft attitude control is improved by turning the parameters of the PID controller and the attitude control simulation of the ROCSAT-1 spacecraft is carried out to verify the design. The simulation is divided into three stages, which are software simulation, real-time simulation, and processor-in-the-loop simulation, respectively. Based on the software and hardware simulation results, the correctness of the real-time dynamic simulation for spacecraft attitude is verified and validated.
37
Chun-YuChan and 詹濬瑜. "The Verification of Rapid Prototyping Transtibial Socket Mold Using 3D Measuring Methods." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/51593311484194039522.
Full textAbstract:
碩士<br>國立成功大學<br>機械工程學系碩博士班<br>100<br>The prosthetic transtibial socket for a specific amputee should be custom-made and usually fabricated by a well-experienced prosthetist based on plaster-based manual method. The determination of socket shape at the pressure relief and pressure tolerant areas during the modification of plaster stump mold is the key step of the quality of socket fit. However, to cultivate a well-skilled prosthetist takes a long period of time and cases of bad socket fit to cause amputee discomfort occur from time to time. The main objective of this study is to develop an effective process that may improve the uncertainty quality of socket fabrication by employing easily-used tools to assist a less experienced prosthetist to fabricate transtibial sockets with comfortable fit.
In this research, the concept of total surface bearing (TSB) socket is employed when duplicating a stump mold by using a vacuum tool. During the step of forming stump mold, patella tendon bearing concept is adopted by sticking a crescent-shaped bar onto patella tendon area and pasting soft pads , on tibia and fibula bones so that the modified shape of duplicated stump mold can create a good fit of socket with acceptable pressure distribution on stump.
For the accuracies of simple type 3D scanner and RP machine adopted in the CAD/RP socket fabrication process , need to be verified. A higher accurate 3D scanner was used to measure the shapes of duplicated stump molds and RP socket molds and then compare to the CAD model created in a CAD socket design system. The accuracy of simple type 3D scanner is 0.8mm. And the accuracy of 0.2 mm for entry-level RP machine is acceptable for CAD/RP socket Manufacture fabrication method.
Two unilateral amputees participated in this research to verify the applicability of the CAD/RP Transtibial socket fabrication process by measuring the interface pressure distribution between socket and stump. According to amputees’ subjective opinions, there were no pains on stump while wearing the sockets fabricated by the CASD/RP process and , walking normally without discomfort. The experimental results showed that the interface pressures are reasonable. By employing easily-used tools, including a vacuum forming device together with shape modification method, simple type 3D scanner and rapid prototyping (RP) machine, an RP sockets mold can replace a plaster stump mold that is heavily relied on manual skills to fabricate transtibial socket. The proposed CAD/RP process can help a prosthetist with less experience to fabricate prosthetist prosthetic sockets with acceptable quality.
38
Cheng, Bo-Song, and 鄭柏松. "The Fabrication of Wind Power Blade by Rapid Prototyping and its Computer Simulation." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/60026056759144954132.
Full textAbstract:
碩士<br>清雲科技大學<br>機械工程研究所<br>96<br>This study investigated the effect of the blade parameter on the power generation of the wind turbine. Two types of blades were used in this study. Blades were done by rapid prototyping. Different blade angles of blade produced different output power. Computational Fluid Dynamics software, ANSYS-CFX, is employed to verify the results from experiments. The results showed the data from simulation and experiment is quite similar.
39
Lin, Yi-tsung, and 林億宗. "Application of Rapid Prototyping Technology on Dental Implant Preoperational Simulation and Development of Surgical Guide." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/58688059441693333669.
Full textAbstract:
碩士<br>國立臺灣科技大學<br>機械工程系<br>97<br>The deviation of the implant location during implant surgery results from the different clinical experiences and judgements of doctors. Thus surgical guide was created to define the location and angles of drilling holes. With the surgical guide, the surgical wounds are minimized, and the operation time and wound healing time are shortened. Current implant surgery only utilizes the software to proceed pre-operation planning and simulation. Hence, this research intended to apply the rapid protyping (RP) technique to build real mandible models for implant surgery simulation and surgical guide development.
In this research, computed tomography (CT) data of madible were coverted to a CAD model with vessels, nerve, and orientation pillars by a medical imaging processing software. RP technique was then utilized to obtain a real 3D model for pre-operation planning, imitation of surcial guide surgery, and surgical guide verification. Besides, the CAD model was beneficial to surgical guide development. The designed surgical guide was produced by RP technique and then converted to a ortho-resin model. The finished surgical guide were stacked with RP mandible model for simulating drilling in the surgery. The drilled RP mandible models were CT-scanned and compared with the design. The errors were within acceptabe ranges and the main cause of the erros was from the drilling operation. The RP mandible model made in this research and its procedures have been successfully ulitized in pre-operation simulation and the development of surgical guide to increase surgery successful rate and safety. This appraoch is also applicable to other similar applications.
40
(9733025), Li Xue. "Rapid Modeling and Simulation Methods for Large-Scale and Circuit-Intuitive Electromagnetic Analysis of Integrated Circuits and Systems." Thesis, 2020.
Find full textAbstract:
<div>Accurate, fast, large-scale, and circuit-intuitive electromagnetic analysis is of critical importance to the design of integrated circuits (IC) and systems. Existing methods for the analysis of integrated circuits and systems have not satisfactorily achieved these performance goals. In this work, rapid modeling and simulation methods are developed for large-scale and circuit-intuitive electromagnetic analysis of integrated circuits and systems. The derived model is correct from zero to high frequencies where Maxwell's equations are valid. In addition, in the proposed model, we are able to analytically decompose the layout response into static and full-wave components with neither numerical computation nor approximation. This decomposed yet rigorous model greatly helps circuit diagnoses since now designers are able to analyze each component one by one, and identify which component is the root cause for the design failure. Such a decomposition also facilitates efficient layout modeling and simulation, since if an IC is dominated by RC effects, then we do not have to compute the full-wave component; and vice versa. Meanwhile, it makes parallelization straightforward. In addition, we develop fast algorithms to obtain each component of the inverse rapidly. These algorithms are also applicable for solving general partial differential equations for fast electromagnetic analysis.</div><div><br></div><div>The fast algorithms developed in this work are as follows. First, an analytical method is developed for finding the nullspace of the curl-curl operator in an arbitrary mesh for an arbitrary order of curl-conforming vector basis function. This method has been applied successfully to both a finite-difference and a finite-element based analysis of general 3-D structures. It can be used to obtain the static component of the inverse efficiently. An analytical method for finding the complementary space of the nullspace is also developed. Second, using the analytically found nullspace and its complementary space, a rigorous method is developed to overcome the low-frequency breakdown problem in the full-wave analysis of general lossy problems, where both dielectrics and conductors can be lossy and arbitrarily inhomogeneous. The method is equally valid at high frequencies without any need for changing the formulation. Third, with the static component part solved, the full-wave component is also ready to obtain. There are two ways. In the first way, the full-wave component is efficiently represented by a small number of high-frequency modes, and a fast method is created to find these modes. These modes constitute a significantly reduced order model of the complementary space of the nullspace. The second way is to utilize the relationship between the curl-curl matrix and the Laplacian matrix. An analytical method to decompose the curl-curl operator to a gradient-divergence operator and a Laplacian operator is developed. The derived Laplacian matrix is nothing but the curl-curl matrix's Laplacian counterpart. They share the same set of non-zero eigenvalues and eigenvectors. Therefore, this Laplacian matrix can be used to replace the original curl-curl matrix when operating on the full-wave component without any computational cost, and an iterative solution can converge this modified problem much faster irrespective of the matrix size. The proposed work has been applied to large-scale layout extraction and analysis. Its performance in accuracy, efficiency, and capacity has been demonstrated.</div>
41
Karipidis, Claus-Ulrich [Verfasser]. "A versatile DSP, FPGA structure optimized for rapid prototyping and digital real time simulation of power electronic and electrical drive systems / vorgelegt von Claus-Ulrich Karipidis." 2001. http://d-nb.info/963976044/34.
Full text
42
Vido, Alan. "Estimación temprana de proyectos de software mediante Léxico Extendido del Lenguaje y Puntos de Caso de Uso." Tesis, 2014. http://hdl.handle.net/10915/46163.
Full textAbstract:
Actualmente existe un gran número de técnicas y herramientas para realizar estimaciones en los procesos de software, pero muchas de ellas requieren de gran volumen de información del proyecto que se está analizando, dificultando una estimación temprana del esfuerzo requerido para desarrollar dicho proyecto.
Aquellos analistas que trabajan con el Léxico Extendido del Lenguaje, al contar con este modelo en etapas tempranas del software, pueden inferir ciertas características del proyecto, como pueden ser los Casos de Uso, las clases y entidades de base de datos que formaran parte del diseño del proyecto.
Por otro lado, existen técnicas de estimación de esfuerzo ampliamente utilizadas y estandarizadas que se valen de estas características, como por ejemplo Puntos Caso de Uso, pero que en una etapa temprana de elicitación de requerimientos no son aplicables por falta de información.
Este trabajo pretende brindar a los usuarios que utilizan Léxico Extendido del Lenguaje en su proceso de elicitación de requerimientos, una herramienta que, a partir de la información recabada en las etapas tempranas de dicho proceso, proporcione una estimación del esfuerzo necesario para realizar el proyecto, basada en un método ampliamente utilizado y estandarizado.
43
Friendrich, Wernher Rudolph. "Towards the elicitation of hidden domain factors from clients and users during the design of software systems." Diss., 2008. http://hdl.handle.net/10500/2629.
Full textAbstract:
This dissertation focuses on how requirements for a new software development system are elicited and what pitfalls could cause a software development project to fail if the said requirements are not captured correctly. A number of existing requirements elicitation methods, namely: JAD (Joint Application Design), RAD (Rapid Application Development), a Formal Specifications Language (Z), Natural Language, UML (Unified Modelling Language) and Prototyping are covered. The aforementioned techniques are then integrated into existing software development life cycle models, such as the Waterfall model, Rapid Prototyping model, Build and Fix model, Spiral model, Incremental model and the V-Process model. Differences in the domains (knowledge and experience of an environment) of a client and that of the software development team are highlighted and this is done diagrammatically using the language of Venn diagrams. The dissertation also refers to a case study highlighting a number of problems during the requirements elicitation process, amongst other the problem of tacit knowledge not surfacing during elicitation.
Two new requirements elicitation methodologies are proposed namely: the SRE (Solitary Requirements Elicitation) and the DDI (Developer Domain Interaction) methodology. These two methods could potentially be more time consuming than other existing requirements elicitation methods, but the benefits could outweigh the cost of their implementation, since the new proposed methods have the potential to further facilitate the successful completion of a software development project. Following the introduction of the new requirements elicitation methods, they are then applied to the aforementioned case study and highlight just how the hidden domain of the client may become more visible, because the software development team has gained a deeper understanding of the client’s working environment. They have therefore increased their understanding of how the final product needs to function in order to fulfil the set out requirements correctly.
Towards the end of the dissertation a summary and a conclusion as well as future work that could be undertaken in this area are provided.<br>Computer Science<br>M. Sc. (Computer Science)
44
Mahesh, N. "Interactive Virtual Machining : A Voxel Based Approach." Thesis, 1997. http://etd.iisc.ernet.in/handle/2005/2143.
Full text