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Chaudhari, Sachin B. "DEVELOPMENT OF AN INTERNET-BASED ANALYSIS TOOL USING THE BOUNDARY ELEMENT METHOD." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin971963697.
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Fang, Chen Yihui. "Modélisation thermique des moteurs asynchrones en vue de la réalisation d'un outil CAO." Rouen, 1994. http://www.theses.fr/1994ROUE5077.
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Une modélisation thermique d'un moteur asynchrone fermé est effectuée dans la présente étude à l'aide d'un logiciel de calcul en éléments finis appelé Systus. Le modèle conçu en 3D représente une configuration assez complexe du moteur. Le coefficient d'échange dans les enceintes du moteur est un paramètre non accessible comme il est reconnu dans la littérature scientifique. De ce fait, un modèle de mélange parfait de l'écoulement dans les enceintes est avancé afin d'identifier le coefficient d'échange. Ce traitement est original et efficace. Grâce à la performance du logiciel Systus, les conductivités effectives du bobinage sont déduites par voie numérique, et celles du paquet de tôles par confrontation entre l'échauffement simulé et mesuré. Dans un but de généraliser la modélisation, nous avons réalisé un outil informatique d'identification qui est constitué par un programme d'optimisation non linéaire Rosenbrock et un modèle établi sous Systus. Une procédure automatique et paramétrique de simulation en champ de températures est fournie afin de rendre l'utilisation plus facile pour les concepteurs
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Lee, Taeyoung. "Improved slab method for axisymmetric forging." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178221157.
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Arnesson, Frida. "WORK METHOD TO SIMPLIFY TRANSFER OF 3D MODELS TO ANSYS FOR ANALYSIS AT ATLAS COPCO ROCK DRILLS AB." Thesis, Örebro universitet, Akademin för naturvetenskap och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-16097.
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Frabolot, Ferdinand. "Optimisation de forme avec détection automatique de paramètres." Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2182/document.
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L’objectif de ce travail de thèse est de pouvoir intégrer totalement l’optimisation de forme des raidisseurs de capot dans un processus de conception industrielle et cela afin d’optimiser la forme et la distribution des raidisseurs dans un contexte multi-objectif (voire multi-disciplinaire) d’une structure 3D surfacique. Pour ce faire, nous avons tout d’abord établi un aperçu de l’état de l’art dans l’optimisation de forme des structures en classifiant les différentes méthodes de paramétrage de forme, en trois catégories ; les méthodes basées sur la géométrie (telle la paramétrisation d’un modèle de type CAO), les méthodes basées sur une grille fixe (telles que les méthodes d’optimisation topologique) et les méthodes basées sur le maillage (telles que les méthodes de régularisation du maillage). Toutefois, aucune de ces méthodes ne satisfait pleinement aux objectifs posés. Nous introduisons ainsi dans cette thèse la méthode FEM-CsG : Finite Element Mesh - Constructive surface Geometry. Imprégnée d’un fort contexte industriel, cette méthode propose une réponse à des contraintes telles que la possibilité de représenter la solution optimale par un ensemble de paramètres CAO, la possibilité d’adapter le modèle EF à l’analyse souhaitée et la garantie d’une représentation géométrique et d’un maillage robuste. En proposant d’intégrer des formes élémentaires paramétrées et prémaillées issues d’une bibliothèque de formes dans une structure coque 3D maillée par l’utilisation des variables issues de la CAO, la méthode FEM-CsG permet une évolution constante de la topologie guidée par l’optimisation. Ainsi, même si la topologie est modifiée la forme résultante reste conforme avec une représentation CAO par construction, correspondant davantage à la réalité des optimisations réalisées en avant-projet. La méthode FEM-CsG a été validée sur deux études de cas, de complexité variable, permettant de mettre en avant la robustesse de cette dernière. Ainsi, avec un choix intelligent et cohérent des variables de formes, les problèmes d’optimisation peuvent avec un nombre restreint de variables explorer un nombre important de topologies ou de formes. Les changements de topologies s’effectuent de manière continue, validant ainsi la méthode à tout type d’analyse souhaitée<br>The objective of this thesis work is to be able to completely integrate shape optimization of car inner hood stiffeners in a complex industrial process, in order to fully optimize the shape and distribution of the stiffeners in a multi-objective approach (or even multi-disciplinary) of a 3D surfacic structure. To this end, we established, at the outset, an insight of the state-of-the-art in shape optimization of structures by classifying the different shape parametrizations in three distinct categories : geometry-based methods (a shape parametrization such as a CAD model), grid-based methods (such as topology optimization methods) and mesh-based methods (such as morphing methods or mesh regulation). However, none of these methods fully satisfies the set objectives. Thus, we will introduce in this work the FEM-CsG method : Finite Element Mesh - Constructive surface Geometry. Bolstered by its strong industrial context, this method offers a response to such constraints, i.e. the possibility to represent the optimal solution by a system of CAD parameters, the possibility to adapt the FE model to the wanted analysis and the guarantee of a robust geometrical representation and mesh stability. We offer to incorporate premeshed parameterized elementary forms into a 3D sheet meshed structures. Hence, these forms are arising from a CAD parameterized elementary form library. Furthermore, the FEM-CsG method uses a set of operators acting on the mesh allowing a constant evolution of the topology guided by optimization. Therefore, even if the topology may vary, the resulting shapes comply with CAD representations by construction, a solution better reflecting the reality of optimizations performed during the preliminary development stage. The FEM-CsG method has been validated on two simple case studies in order to bring forward its reliability. Thus, with an intelligent and coherent choice of the design variables, shape optimization issues may, with a restrictive number of variables, explore an important number of shapes and topologies. Topology changes are accomplished in a continuous manner, therefore validating the FEM-CsG method to any desired analysis
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Horák, Aleš. "Výroba prototypu automobilu s využitím moderních metod a technologie CAD/CAM." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229335.
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The project developed under the engineering studies, solves the problem of production of a prototype car using modern technology, reverse engineering and CAD / CAM. Based on the literary study of the issue, was designed process of digitization of the physical model of car, including the treatment and processing of data. Follow-up step was to verify the production of the additive rapid prototyping technology - FDM method. Verification of the results was performed on a vertical milling cantilever FV 25 CNC with control system Heidenhain iTNC 530 using a cutting strategies by PowerMILL CAM software. At the end of the resulting models edit as necessary.
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Boyle, Iain Mackinnon. "CAFixD: A case-based reasoning method for fixture design." Link to electronic dissertation, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-050406-131631/.
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Ingalls, Stephen A. "Application of concurrent engineering methods to the design of an autonomous aerial robot." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/12222.
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Podlosky, Kelly L. "An In-Vitro Comparison of Irrigation Methods Using CAD/CAM Guides and the Influence on Heat Generation at the Bone Level." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1342564190.
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Hwang, Jenq-Fong. "Advanced computer-aided design method on the stress analysis of internal spur gears." Connect to this title online, 1986. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1102453550.
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Šrenk, Jakub. "Návrh a realizace CO2 Laseru s výkonem do 100W." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444270.
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This work is focused on the problematics of small CO2 lasers and their possible use for commercial production. The first part describes devices available on the market and evaluation of their parameters. The practical part specifies the parameters that arise from the potential use of technology. Based on these parameters, design of the machine and its complete mechanical design are elaborated. Furthermore, the experimental part deals with the design of structural components, control system, electrical systems and in general a complex technical-technological solution of the equipment, including economic evaluation of the design. Part of the work is also the construction of the machine itself, including activation, adjustment and debugging for the considered production. The constructed machine was subject to testing to ensure required quality of production.
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Abrinia, K. "A generalised upper bound method for the solution of three dimensional extrusion of shapes using CAD CAM techniques." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535512.
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Lemaire, Edward D. "Development and validation of a quantitative method for defining manual prosthetic modifications for use with CAD/CAM systems." Thesis, University of Strathclyde, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342455.
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Jokhadar, Hossam. "Comparison of the accuracy of fit of CAD/CAM crowns using three different data acquisition methods." Thesis, NSUWorks, 2013. https://nsuworks.nova.edu/hpd_cdm_stuetd/23.
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A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.
Background. Earlier research evaluated the 3D internal fit of CAD/CAM crowns after direct versus indirect laser scanning. To date, no study has evaluated the marginal integrity of all-ceramic crowns milled with different type of scanning systems via different methods of scanning. The purpose of This study was conducted to assess the marginal integrity of all-ceramic crowns milled with the E4D CAD/CAM system (D4D, Richardson, Texas) using three different scanning methods of a prepared model (direct scanning and indirect scanning of a cast, and scanning of an impression material).
Methods. A metal die model of a prepared mandibular first molar was fabricated according to specifications for tooth preparation for the E4D CAD/CAM system. Fifty five all-ceramic crowns were milled using this system: 5 crowns were made from scanning of the metal die; 25 crowns were made from scanning of 5 PVS impressions of the metal die, with each impression scanned 5 times; and 25 crowns were made from scanning stone dies poured from the same previous 5 PVS impressions. Each stone die was scanned 5 times. An internal gap to provide space for cement was kept constant at 25 microns. Marginal integrity of the crowns was assessed using optical microscopy. Results. The overall mean marginal gap and standard deviation for crowns was 78.1&mgr;m (18.9) for scanning the metal dies, 148.9&mgr;m (25.4) for scanning impressions and 126.2&mgr;m (28.2) for scanning the stone casts. ANOVA revealed significant differences in marginal gap between the three different groups. Conclusions. The direct scanning of a metal die produced crowns with significantly smaller marginal gaps than the marginal gap seen from scanning a PVS impression or a stone cast (P<.05). Additionally, it was found that scanning PVS impressions or stone casts, produced crowns with unacceptable mean marginal gaps (over 120&mgr;m). It was also observed that difficulty of scanning PVS impressions and tracing the finish line lead to overhanging margins and larger marginal gaps for both crowns produced via that method.
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Canto, Rodrigo Bresciani. "Projeto e fabricação de moldes para prensagem isostática utilizando tecnologias CAD/CAE e prototipagem rápida." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-17032003-134931/.
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Apresenta uma metodologia para o projeto e fabricação de moldes para prensagem isostática de pó cerâmico (alumina) utilizando ferramentas computacionais CAD/CAE associadas à tecnologia de Prototipagem Rápida. O processo de prensagem isostática é simulado utilizando o método dos elementos finitos. Para a representação da compactação do pó cerâmico é utilizado o modelo de Drucker-Prager/cap e para a representação do comportamento do material elastomérico é utilizado o modelo hiperelástico de Mooney-Rivlin, ambos disponíveis no programa ABAQUS. Tal simulação visa obter o projeto do molde de forma mais rápida e precisa, ajustando-o até que se alcance um molde adequado para produzir um compacto com uma quantidade de sobrematerial ideal para o processo de usinagem a verde. Para isso utilizou-se como estudo de caso uma esfera cerâmica para implante de quadril. Um protótipo virtual do molde adequado obtido das simulações é então modelado e reproduzido em plástico ABS (Acrylonitrile Butadiene Styrene) pela tecnologia de Prototipagem Rápida FDM (Fused Deposition Modeling). Esse protótipo físico é a base para o desenvolvimento de matrizes rígidas e em silicone, que são utilizadas para a confecção da parte flexível do molde (matriz elastomérica) e de partes rígidas como a gaiola suporte obtidas por vazamento dos polímeros. Constatou-se a viabilidade da utilização da metodologia de projeto e fabricação do molde para prensagem isostática, considerando que as simulações mostraram-se bastante coerentes com os resultados experimentais obtidos de componentes prensados.<br>This work presents a methodology for the design and fabrication of ceramic powder isostatic pressing moulds using CAD and CAE tools and Rapid Prototyping. The isostatic pressing process was simulated using the finite element method. The compaction behavior of ceramic powder is described by the Drucker-Prager/cap constitutive model and the behavior of elastomeric material is described by the Mooney-Rivlin constitutive model within the commercial finite element software ABAQUS®. These simulations are required to adjust the mould design in order to suit the geometry of the compact and green machining allowance. For this study, it is used a case study consisting of pressing a ceramic sphere for hip implant stem. A virtual prototype was designed from the geometry obtained from the simulations and reproduced in Acrylonitrile Butadiene Styrene (ABS) polymer, using the Rapid Prototyping technology - Fused Deposition Modeling (FDM). Silicone moulds were obtained from the polymer prototype and used to aid in the making of the elastomeric bag and mould support cage. The methodology used in this investigation was validate considering that the simulations yield to a good agreement with measured manufactured components.
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Al-Haddad, Tristan Farris. "PerFORMance: Integrating Structural Feedback into Design Processes for Complex Surface-Active Form." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07102006-111810/.
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Sellgren, Ulf. "Simulation-driven design : Motives, Means, and Opportunities." Doctoral thesis, KTH, Maskinkonstruktion, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2875.
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Efficiency and innovative problem solving are contradictory requirements for productdevelopment (PD), and both requirements must be satisfied in companies that strive to remainor to become competitive. Efficiency is strongly related to ”doing things right”, whereasinnovative problem solving and creativity is focused on ”doing the right things”.Engineering design, which is a sub-process within PD, can be viewed as problem solving or adecision-making process. New technologies in computer science and new software tools openthe way to new approaches for the solution of mechanical problems. Product datamanagement (PDM) technology and tools can enable concurrent engineering (CE) bymanaging the formal product data, the relations between the individual data objects, and theirrelation to the PD process. Many engineering activities deal with the relation betweenbehavior and shape. Modern CAD systems are highly productive tools for conceptembodiment and detailing. The finite element (FE) method is a general tool used to study thephysical behavior of objects with arbitrary shapes. Since a modern CAD technology enablesdesign modification and change, it can support the innovative dimension of engineering aswell as the verification of physical properties and behavior. Concepts and detailed solutionshave traditionally been evaluated and verified with physical testing. Numerical modeling andsimulation is in many cases a far more time efficient method than testing to verify theproperties of an artifact. Numerical modeling can also support the innovative dimension ofproblem solving by enabling parameter studies and observations of real and syntheticbehavior. Simulation-driven design is defined as a design process where decisions related tothe behavior and performance of the artifact are significantly supported by computer-basedproduct modeling and simulation.A framework for product modeling, that is based on a modern CAD system with fullyintegrated FE modeling and simulation functionality provides the engineer with tools capableof supporting a number of engineering steps in all life-cycle phases of a product. Such aconceptual framework, that is based on a moderately coupled approach to integratecommercial PDM, CAD, and FE software, is presented. An object model and a supportingmodular modeling methodology are also presented. Two industrial cases are used to illustratethe possibilities and some of the opportunities given by simulation-driven design with thepresented methodology and framework.<br>QC 20100810
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Melnikov, Anton. "DRESDYN - Entwicklung der Forschungsanlage für große Experimente mit flüssigem Natrium." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-206951.
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Die Anlage DRESDYN dient in erster Linie der Erforschung des planetaren Dynamo-Effektes. Für die Untersuchungen wird ein zylindrischer Behälter mit 2 Meter Innendurchmesser und 2 Meter Länge vollständig mit flüssigem Natrium gefüllt. Zur Erzielung des Dynamoeffektes vollführt der Behälter eine Rotation bis zu 10 Hz und eine Präzession bis zu 1 Hz, wobei der Winkel zwischen den jeweiligen Achsen zwischen 45 und 90° liegt. Während der Versuche entsteht im Behälter ein komplexes dynamisches Druckfeld, sowie Temperaturgradienten, was zu komplexen überlagerten Spannungszuständen führt. Desweiteren entstehen während der Rotation des Behälters und der massiven Rahmenkonstruktionen große Massenkräfte, welche z.B. in Form vom gyroskopischen Moment beschrieben werden können. Die Strukturzuverlässigkeit der Anlage muss gewährleistet sein, was vielerlei Nachweise nach sich zieht. Es wird erläutert wie die Knotenlasten mittels MKS (MBSim) berechnet wurden und wie mittels FEM (ANSYS) an linearen und nichtlinearen Modellen verschiedene Analysen durchgeführt wurden. Zusätzlich wird eine Möglichkeit der Anwendung der FKM-Richtlinie auf die Ergebnisse von ANSYS mit Hilfe von MathCad Prime kurz erklärt, wobei durch die Rückführung die Auslastungsgrade direkt im ANSYS Modell angezeigt werden können. Zusätzlich werden Untersuchungen und Modellabgleiche (Nichtlinearitäten z.B. reibungsbehaftete Kontakte) an einem skalierten Prototyp der Verriegelungseinrichtung geplant, was ebenfalls vorgestellt wird. Der Vortrag soll einen Aufschluss über die für die Entwicklung der Anlage angewendeten Methoden geben, sowie einige interessante mittels MKS und FEM gelöste Aufgaben vorstellen.
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Nevlyudov, I., V. Yevsieiev, S. Miliutina, and V. Bortnikova. "Technological Process Identification Method for Accelerometers MEMS." Thesis, CADMD 2016. XXIV International Ukrainian-Polish Conference, 2016. http://openarchive.nure.ua/handle/document/3510.
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HASE, Hiroyuki, Toyohide WATANABE, and Jien KATO. "A Highway Surveillance System Using an HMM-Based Segmentation Method." Institute of Electronics, Information and Communication Engineers, 2002. http://hdl.handle.net/2237/14983.
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Berg, Jonas, and Jarmo Luukkonen. "Method to off-line program robotized metal deposition." Thesis, University West, Department of Technology, Mathematics and Computer Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-1350.
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<p>This report is a ten credit degree project and is aimed at technically skilful personnel at Volvo Aero Corporation and at the University West. The goal of the project is to create a robot program that can manufacture a part by Metal Deposition from a 3-D CAD model (Unigraphics) via a CAM module and a CAR program (IGRIP) to an ABB robot. Metal Deposition is a method to build new parts, add material to an existing part and repair components that have been damaged in earlier processes. The method can be used with different kinds of welding with powder or welding wire as the additive material. Three reference geometries were used; two bosses and a circular sweep. UG/CAM is used to create the CLS (Cutter Location Source) data. Different milling operations are used to emulate welding.The program which imports the coordinates from the CLS data to IGRIP, as well as the export program, was written in GSL (Graphics Simulation Language). GSL is a Pascal-like programming language used to control the behaviour of simulation models. The import program reads linear movement coordinates line by line until the whole CLS file has been converted into IGRIP. UG/CAM should only use linear movement when using this program. If circular movements are used, a feature that converts those has to be added to the import program.</p>
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Pášová, Petra. "Automobil v podnikání." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-114502.
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The diploma thesis discusses an acquiring a car in a situation when the company has not a sufficient financial amount for its purchase. There are described the main kinds of leasing and credit at the beginning of this thesis. Afterwards is compared accounting as per the Czech regulations and IFRS and the tax impact of each of these types of accounting. The difference in accounting as per the Czech regulations and IFRS is as well illustrated on a leasing contract. The conclusion is focused on a comparison of leasing and credit using a method of net benefit of leasing and method of discounted costs.
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Kungsman, Jimmy. "Semiclassical approximation of Dirac resonances using the CAP method." Licentiate thesis, Uppsala universitet, Analys och tillämpad matematik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-172750.
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Szyszka, Jörg, Dietmar Süße, and Christine Schöne. "CAE Methoden in der Einarbeitungsphase der Blechumformung." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-228301.
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Aus der Einleitung:
"Um Kosten in der Produktentwicklung weiter zu minimieren und gleichzeitig die Qualität der zu fertigenden Produkte zu gewährleisten, nehmen virtuelle Methoden in der Produktentwicklung einen immer größeren Stellenwert ein (Stelzer & Eigner, 2009). An die Maßhaltigkeit von umgeformten Blechteilen werden ständig höhere Anforderungen gestellt. Die Ursachen für Maßabweichungen an gefertigten Blechteilen resultieren maßgeblich aus den Berechnungsmodellen, die das System Werkzeug-Blechteil-Umformmaschine bisher in der Virtuellen Produktentwicklung noch nicht vollständig und exakt abbilden können. Mehrere Zyklen händischer Änderungen an den Umformwerkzeugen sind heute noch die Regel. Dieser Prozess wird bei der Blechumformung als Einarbeitungsphase bezeichnet und wird von Spezialisten des Werkzeugbaus unter Nutzung von unscharfem Erfahrungswissen durchgeführt. Der Zyklus der manuellen Einarbeitungsphase im Bereich des Werkzeugbaus steht den wirtschaftlichen Forderungen zum schnelleren Serienanlauf und zur Kostensenkung entgegen. Hier kann die Verkürzung des Einarbeitungsprozesses dienlich sein."
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Mason, Jonathan D. "Can contemporary art methods facilitate designers' creativity?" Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/33711.
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Art and industrial design share a long history, with some of the first industrial designers originating from the arts. Through the early part of the twentieth century many designers were educated and influenced by artists and on occasions they collaborated in the development of art/design movements. In recent decades this relationship has weakened with artists and industrial designers working towards different goals and paying less attention to how one another work. This research was undertaken to investigate whether contemporary artists were now using methods that may facilitate industrial design.
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Genderka, Martin Josef. "Objektorientierte Methode zur Entwicklung von Produktmodellen als Basis integrierter Ingenieursysteme /." Aachen : Shaker, 1995. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=006845517&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Edme, Pascal. "Can we apply the receiver function method to OBC data?" Paris, Institut de physique du globe, 2007. http://www.theses.fr/2007GLOB0018.
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In this thesis, we review the Receiver Function (RF) method, conceived many years ago in earthquake seismology, to see whether it can also be used in reflection seismology, and more specifically to see whether it can be applied to ocean-bottom-cable (OBC) data. The conventional RF method is used to determine the local PS wave response of a target zone below a multi-component 3C receiver and has been originally designed to process individual earthquake data of constant ray parameter p, acquired at the free surface. The target is illuminated from below. The converted PS wavefield generated at the receiver side is isolated from the global earth response by deconvolving the horizontal Ux component with the vertical Uz component, where Uz is assumed to contain only the impinging P waves (i. E. The unpredictable effective source function). Simultaneously to the source signature removal, the effect of the deconvolution can be subdivided into two steps: (1) P-PS wave separation and (2) multiples removal. The keyword is combination between components (by adaptive subtraction) or equivalently ratio between components. Our motivation is to reproduce these two steps with OBC data, in order to determine the (separated) primary PP and PS responses generated in the sub-seafloor area. However, there are several issues that require special attention when we implement the RF technique to OBC acquisition geometry. Firstly, the target (i. E. The sub-seafloor) is illuminated from above. Therefore there exist three types of incident waves at the receiver level: the upgoing P and PS wavefields (Pup and Sup as for land data) but also the additional downgoing P wavefield (Pdown). Secondly these wavefields are mixed between the components with time varying ray parameters, which precludes the possibility of applying the RF approach in the conventional time-offset domain. These problems can be addressed by taking into account the additional measurement of the pressure wavefield by the hydrophone Uh and by transforming the data in the ¿ -p domain (requiring fine receiver spacing usually afforded by OBCs). This transformation reorders the data by incidence angle at the receiver level, such that the pure upgoing PP and PS wavefields can be separated, based on polarization angle discrimination. This first step partially addresses the problem of multiples in the data by removing the downgoing (receiver side) water multiples, but it requires the knowledge of the seafloor properties as inputs. The other advantage of the ¿ ¡ p domain is that the water multiple reverberation becomes periodic. Remaining pure upgoing (source-side) water multiples are fully predictable (in contrast to overlapping source-side and receiver-side multiples) and can therefore be removed using predictive deconvolution (this is the required second step). Our adapted version of the RF technique uses the various ratios between components to estimate the elastic properties at the seafloor, as well as calibration operators, required for the decomposition. Our data-driven method can be automatically applied with a minimum of user-defined inputs, by taking advantages of the coherency between adjacent p traces and the redundancy of informations within the multiples. The strategy has been successfully applied to field data. Our results suggest several avenues for further processing
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Kjellsson, My, and Malin Larsson. "3D CAD METHODOLOGY PRESTUDY." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-69781.
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The report describes a prestudy project for Epiroc Rock Drills AB at the department PLM Solutions. The company consists of a number of divisions thatall work with or are affected by CAD models. PLM Solutions has long seen a need for a common methodologybut due to the priorities of other projects this has been delayed. The purpose of the prestudy was to provide a mapping of the CAD methodology at the company today and also investigate the need for methodology. Based on the mapping, a recommendation was given ofhow PLM Solutions shouldproceed with a major methodology project. The recommendation wastocreate a common overall CAD methodology and take advantage of the already existing methodsin the organization. As the problem was treated as a prestudy, the method of a prestudy model is also the case. The model is general and adapted to fit this particular project. The approach deals with the phases: start-up, background analysis and solutions. The background analysis examines the current situation analysis using models for interviewing techniques. A larger part of the basis for the prestudy rests on interviews with stakeholders. The result is presented based on the same phases that the method consists of. The result is a mapping of the methodology and needs of the divisions, this is also visualized using a SWOT analysis. The results arealso the recommendation and requirements based on the interviews and business case. Continued work should as a suggestion include several more interviews, collecting more material from around the divisions, more detailed calculations and a focus on the departments that are affected by the models.<br>Rapporten avhandlar ett förstudieprojekt för företaget EpirocRock Drills AB på avdelningen PLM Solutions. Företaget består av ett antal divisioner som alla arbetar med eller påverkas av CAD-modeller. PLM Solutions har länge sett ett behov av en gemensam metodik men på grund av prioriteringar av andra projekt har detta dröjt. Förstudiens syfte var att ta fram en kartläggning av den CAD-metodik som finns på företaget idag samt även se vilket behov av metodik som förekommer. Utifrån kartläggningen skulle en rekommendation ges i fråga om hur PLM Solutions skulle gå vidare vid ett större metodikprojekt. Rekommendationen var att skapa en övergripande gemensam CAD metodik och dra nytta av de redan existerande metoderna runt om i verksamheten. I och med att problemet behandlades som en förstudie utgörs också metoden av en förstudiemodell. Modellen är generell och anpassad för att passa just detta projekt. Tillvägagångssättet behandlar faserna uppstart, bakgrundsanalys och lösningar. I bakgrundsanalysen behandlas nulägesanalysen med hjälp av modeller för intervjuteknik. En större del av det underlag förstudien utgörs av, bygger på intervjuer med intressenter. Resultatet presenteras utifrån samma faser som metoden utgörs av. Resultatet består av en kartläggning av den metodik och behov som finns bland divisionerna, detta visualiseras också med hjälp av en SWOT-analys. Resultatet utgörs också av rekommendationen och kravspecifikationen som baseras på de intervjuer som utförts samt affärsfallet. Fortsatt arbetebör förslagsvis inkludera flerintervjuer, samla in mer material fråndivisionerna, mer utförliga beräkningar och ett större fokus på de avdelningar som påverkas av modellerna.
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Szyszka, Jörg, Dietmar Süße, and Christine Schöne. "CAE Methoden in der Einarbeitungsphase der Blechumformung." TUDpress - Verlag der Wissenschaften GmbH, 2012. https://tud.qucosa.de/id/qucosa%3A30507.
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Aus der Einleitung:
"Um Kosten in der Produktentwicklung weiter zu minimieren und gleichzeitig die Qualität der zu fertigenden Produkte zu gewährleisten, nehmen virtuelle Methoden in der Produktentwicklung einen immer größeren Stellenwert ein (Stelzer & Eigner, 2009). An die Maßhaltigkeit von umgeformten Blechteilen werden ständig höhere Anforderungen gestellt. Die Ursachen für Maßabweichungen an gefertigten Blechteilen resultieren maßgeblich aus den Berechnungsmodellen, die das System Werkzeug-Blechteil-Umformmaschine bisher in der Virtuellen Produktentwicklung noch nicht vollständig und exakt abbilden können. Mehrere Zyklen händischer Änderungen an den Umformwerkzeugen sind heute noch die Regel. Dieser Prozess wird bei der Blechumformung als Einarbeitungsphase bezeichnet und wird von Spezialisten des Werkzeugbaus unter Nutzung von unscharfem Erfahrungswissen durchgeführt. Der Zyklus der manuellen Einarbeitungsphase im Bereich des Werkzeugbaus steht den wirtschaftlichen Forderungen zum schnelleren Serienanlauf und zur Kostensenkung entgegen. Hier kann die Verkürzung des Einarbeitungsprozesses dienlich sein."
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Ramos, Mayara. "Testes de usabilidade para idosos : aplicação de Digital Human Modeling (DHM) em softwares CAD/CAE." Universidade do Estado de Santa Catarina, 2014. http://tede.udesc.br/handle/handle/2020.
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Previous issue date: 2014-07-30<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The present research presents the problem related to the aging population of the world and the necessary improvement on product development to better serve these users considering their limitations that come with the aging process; one of the possible improvements is the inclusion of these user on usability testing. This inclusion can be made with low cost and without exposing the user through virtual testing, which is where the problem of this research focuses, if is possible to to perform these usability tests entirely in SolidWorks® platform. The objective of this research is to develop a procedure for virtual usability testing in SolidWorks® software, with focus on elderly users. To achive the corroboration of the hypothesis (is possible to do virtual usability testing through the software plataform), was reproduced the traditional usability test of a remote control conducted with elder users in a virtual usability test on the SolidWorks® plataform, the modeled user presented limitations based on the users participants of the traditional testing, enabling the comparison of the found results of the tests. On the usability tests were evaluated the performance metrics of task success and number of positioning of the remote control were necessary to complete the task. By the test results we were able to realize that the variable of number of positions necessary to complete the task is more appropriate to evaluate the similarity between the results of real and virtual tests. The result of the statistic test for this metric indicated that there are significant differences between the results of the traditional test and the results of the virtual test, but when evaluated only the results of females elders the results showed no significant differences. It was concluded that further research is necessary to achieve corroboration of the hypothesis, considering that the results indicated significant differences between the results. The fact that the group of female older users have shown similar results, indicating that with improvements in
usability testing procedure in SolidWorks® platform can achieve similar results for older users of both genders.<br>O presente trabalho apresenta problemática relacionada ao cenário mundial do envelhecimento da população e as melhorias necessárias no desenvolvimento dos produtos para melhor atender esses usuários considerando as limitações que são desenvolvidas no envelhecimento; uma dessas melhorias é a inclusão desse usuário nos testes de usabilidade. Essa inclusão pode ser feita com custo baixo e sem expor o usuário por meio de testes virtuais, que é onde se apresenta o problema dessa pesquisa: se é possível realizar esses testes de usabilidade inteiramente na plataforma do SolidWorks®? O objetivo desta pesquisa é desenvolver um procedimento para testes de usabilidade virtuais realizados no software SolidWorks®, com foco nos usuários idosos. Para procurar a corroboração da hipótese (de que seria possível realizar testes de usabilidade digitalmente nesta plataforma), foi reproduzido o teste de usabilidade tradicional de um controle remoto realizado com usuários idosos em um teste de usabilidade virtual na plataforma do SolidWorks®, em que o usuário modelado apresentou limitações baseadas nas dos usuários participantes do teste tradicional, podendo assim, comparar os resultados encontrados nos testes. No teste de usabilidade foram avaliadas as medidas de desempenho, sucesso de realização da tarefa e número de reposicionamentos do controle remoto necessários para realizar a tarefa. Pelos resultados dos testes pode se perceber que a variável de número de reposicionamentos para realizar a tarefa é a mais adequada para avaliar a similaridade entre os resultados dos testes real e virtual. O resultado do teste estatístico dessa variável indicou que existem diferenças significativas entre os resultados encontrados do teste tradicional e os resultados do teste virtual, mas quando avaliado apenas os resultados dos indivíduos idosos do sexo feminino os resultados não apresentaram diferenças significativas. Foi concluído que ainda são necessárias pesquisas para se atingir a corroboração da hipótese, considerando que os resultados indicaram para
diferenças significativas entre os resultados. O fato do grupo de usuárias idosas ter apresentado resultados similares, indica que com melhorias no procedimento de testes de usabilidade na plataforma do SolidWorks® pode-se conseguir resultados similares para usuários de idosos de ambos os gêneros.
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Dewi, Alita. "Apport des nouvelles technologies interactives pour l'analyse intégrée en génie électrique : vers un laboratoire virtuel d'expérimentation en électrotechnique." Phd thesis, Grenoble INPG, 2001. http://www.theses.fr/2001INPG0055.
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La course à l'innovation dans la technologie des dispositifs électriques, induit de nouvelles contraintes sur les fonctionnalités des systèmes de CAO en Génie Electrique. Ils doivent permettre l'analyse fine des comportements multiphysiques des dispositifs électriques. Cette puissance, nécessaire en terme de modélisation, se traduit aussi par une complexité en terme de maîtrise par l'utilisateur. Par conséquent, les techniques d'interaction homme - machine, qui avaient été longtemps considérées comme d'intérêt secondaire dans le domaine de l'électrotechnique, deviennent aussi importantes que les modèles physiques. L'objectif de notre travail est de développer des méthodes d'exploration et d'interface homme - machine, naturelles et faciles à comprendre, afin de faciliter l'utilisation des logiciels de simulation en électrotechnique. Pour arriver à cet objectif, nous nous sommes inspirés des activités intervenant dans un laboratoire d'expérimentation en électrotechnique. Nous avons développé un système interactif, le Laboratoire Virtuel d'Expérimentation en Électrotechnique (LVEE), bâti sur le modèle d'un laboratoire réel, et dans lequel le fonctionnement du dispositif électrique est obtenu à l'aide des logiciels de simulation<br>The innovations in the electrical devices technology bring a new constraint for the function of Electrical Engineering CAD System. It must support the integrated analysis of the performances of electrical devices. This requirement is necessary in term of modeling, and also results a complexity in term of utilization by the user. Hence, the techniques of human-machine interaction, which had been considered as the secondary interest during the implementation of CAD System in Electrical Engineering, becomes as important as the model developed. The method of exploring and the human-machine interface, which are two belongings of the techniques of human-machine interaction, should be natural and easily compréhensible in order to hold up the usefulness of the CAD System. For that, the approach of experiment techniques in the electrical devices laboratory has been adopted as the method of exploring, while developing an interactive System that représenta a model of the electrical devices laboratory. Then, the contribution of the Virtual Reality technology has been taken into account for providing the intuitive interaction and the natural visualization of the performances of electrical devices
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Dewi, Alita. "Apport des nouvelles technologies interactives pour l'analyse intégrée en génie électrique : vers un laboratoire virtuel d'expérimentation en électrotechnique." Phd thesis, Grenoble INPG, 2001. http://tel.archives-ouvertes.fr/tel-00597707.
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La course à l'innovation dans la technologie des dispositifs électriques, induit de nouvelles contraintes sur les fonctionnalités des systèmes de CAO en Génie Electrique. Ils doivent permettre l'analyse fine des comportements multiphysiques des dispositifs électriques. Cette puissance, nécessaire en terme de modélisation, se traduit aussi par une complexité en terme de maîtrise par l'utilisateur. Par conséquent, les techniques d'interaction homme - machine, qui avaient été longtemps considérées comme d'intérêt secondaire dans le domaine de Pélectrotechnique, deviennent aussi importantes que les modèles physiques. L'objectif de notre travail est de développer des méthodes d'exploration et d'Interface homme - machine, naturelles et faciles à comprendre, afin de facilité l'utilisation des logiciels de simulation en électrotechnique. Pour arriver à cet objectif, nous nous sommes inspirés des activités intervenant dans un laboratoire d'expérimentation en électrotechnique. Dans un premier temps, nous avons modélisé un vrai laboratoire en dégageant les rôles du dispositif électrique à étudier, des manipulations à mettre en places, des protocoles d'expérimentation, .... Après cela, nous avons développé un système interactif, le Laboratoire Virtuel d'Expérimentation en Électrotechnique (LVEE), bâti sur le modèle d'un laboratoire réel, et dans lequel le fonctionnement du dispositif électrique est obtenu à l'aide des logiciels de simulation. La contribution de la technologie de Réalité Virtuelle a été prise en considération pour fournir l'interaction intuitive et la visualisation naturelle des comportements physiques des dispositifs électriques.
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Kandelid, Stefan. "Work method for 3D modeling in pro/ENGINEER." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-23486.
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This is a 15 credits thesis in mechanical engineering performed at the PLM Solutions group at the Rocktec division within Atlas Copco Rock Drills AB, Örebro, during spring 2012. When designers working with 3D CAD modeling uses different work methods in Pro/ENGINEER (Pro/E) it sometimes results in problems. It is also a problem when designers do not follow the specific work methods defined by Atlas Copco. The purpose of this thesis was to identify the most common problems with 3D models at Atlas Copco Rock Drills AB (RDE) Örebro related to work methods, for example why models crash, why they cannot be checked in to Pro/Intralink or why there are unstable references. The objective was to present a work method to avoid one or two of the most severe problems identified at RDE Örebro. To achieve the objective I started with going through the CAD support call data base, to find out in what areas the organization needed help from the CAD support. The result shows that the engineers request most support in how to use both the modeling and the drawing modules in Pro/E. I also came up with a suggestion for redesign of the CAD support call data base system, that could reduce the time needed for this kind of analysis from days to minutes. Thereafter a number of engineers, all with high skills in Pro/E, were selected for personal interviews. The topic was to identify any lack in defined work methods in Pro/E causing problems that are taking long time to correct. The result shows that the biggest issue for the users is references. I also performed a benchmarking with two other companies within the Atlas Copco Group looking at their CAD guidelines regarding the issues found during the interviews. Thirdly, one assembly each from six different departments were selected and sent to PTC for an in depth analysis with their software tool Expert Model Analysis. The goal was to find any systematic issues regarding work methods in Pro/E. The analysis confirmed what the engineers earlier had brought up as the main issues, namely, references, mass/weight handling and structure in the model tree.<br>Detta är en 15 hp examensarbete i maskinteknik som utförs på PLM Solutions Group på Rocktec divisionen inom Atlas Copco Rock Drills AB i Örebro, under våren 2012.När konstruktörerna arbetar med 3D CAD modellering använder de olika arbetsmetoder i Pro/ENGINEER (Pro/E) vilket ibland leder till problem. Det är också ett problem när konstruktörerna inte följer de arbetsmetoder som definierats av Atlas Copco.Syftet med detta examensarbete var att identifiera de vanligaste problemen med 3D-modeller på Atlas Copco Rock Drills AB (RDE) i Örebro relaterat till arbetsmetoder, till exempel varför modellerna kraschar, varför de inte kan checkas in i Pro/Intralink eller varför det finns instabila referenser. Målet var att presentera en arbetsmetod för att undvika ett eller två av de mest allvarliga problemen identifierade vid RDE Örebro. För att uppnå målet började jag med att gå igenom CAD-supportens samtalsdatabas, för att ta reda på inom vilka områden användarna behövde hjälp från CAD-support. Resultatet visar att konstruktörerna behöver mest hjälp med hur man använder både modellerings- och ritningsmodulerna i Pro/E. Jag tog också fram ett förslag till hur CAD-supportens samtalsdatabas kan göras om, som skulle kunna minska tiden som behövs för denna typ av analys från dagar till minuter. Därefter valdes ett antal ingenjörer ut, alla med hög kompetens inom Pro/E, för personliga intervjuer. Syftet var att identifiera eventuella brist i befintliga arbetsmetoder i Pro/E, vilka orsakar problem som tar lång tid att rätta till. Resultatet visar att det största problemet för användarna är referenser. Jag utförde också en benchmarking med två andra bolag inom Atlas Copco-gruppen genom att jämföra deras CAD rekommendationer kring de problem som kom fram under de tidigare intervjuerna. Som tredje del i examensarbetet valdes en CAD-modell från vardera sex olika avdelningar och skickades till PTC för en fördjupad analys med deras program Expert Model Analysis (XMA). Målet var att hitta systematiska problem gällande arbetsmetoder i Pro/E. XMA-analysen bekräftade vad ingenjörerna tidigare hade fört fram som de viktigaste frågorna, nämligen referenser, massa/vikt hantering och struktur i modellen trädet.
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McCormick, A. H. I. "Application of the moment method to the design of slotted waveguide array antennas." Thesis, Heriot-Watt University, 1988. http://hdl.handle.net/10399/1962.
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Andrews, Peter T. J. "Design reuse in a CAD environment." Thesis, Brunel University, 1999. http://bura.brunel.ac.uk/handle/2438/5086.
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For many companies, design related information mainly exists as rooms of paper-based archives, typically in the form of manufacturing drawings and technical specifications. This 'static' information cannot be easily reused. The work presented in this thesis proposes a methodology to ease this problem. It defines and implements a computer-based design tool that will enable existing design families to be transformed into 'dynamic' CAD-based models for the Conceptual, Embodiment and Detailed stages of the design process. Two novel concepts are proposed here, i) the use of a Function Means Tree to store Conceptual and Embodiment design and ii) a Variant Method to represent Detailed design. In this way a definite link between the more abstract conceptual and the concrete detailed design stages is realised by linking individual detailed designs to means in the Function Means Tree. The use of the Variant Method, incorporating 'state-of-the-art' developments in Solid Modelling, Feature-Based Design and Parametric Design, allows an entire family of designs to be represented by a single Master Model. Therefore, instances of this Master Model need only be stored as a set of design parameters. This enables current design families and new design cases to be more created more efficiently. Industrial Case Studies, including a Lathe Chuck family, a Drive-End casting and a family of Filtration Systems are given to prove the methodology.
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Dam, Long H. "Applied Mass Properties Identification Method to the Cal Poly's Spacecraft Simulator." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1175.
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The Cal Poly Spacecraft Simulator is currently being developed for future testing and verifying theoretical control applications. This paper details the effort to balance the platform and remove undesired external torque from the system using System Identification technique developed by Patrick Healy. Since the relationship between the input and output of the system is linear, the least square method is proposed to identify the mass properties and location of center of mass of the system. The tests use four sine wave generators that are out of phase with different amplitudes as the inputs to excite various structural modes of the system. The outputs, angular rates of the platform, are measured by the newly implemented LN-200 Inertial Measurement Unit that helps reducing the measurement noise. Two test cases of 90o yaw rotations with the identified inertia were performed and validated against the computer simulation model; and the result shows that the test cases trajectories followed closely with the computer simulation model.
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Berndt, Karsten, and Marko Ebermann. "Methodik zur funktionsorientierten Tolerierung mittels CAD-basierter Analysen." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-171981.
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Teil 1 Karsten Berndt
Die Festlegung von Toleranzen ist eine alltägliche Aufgabenstellung des Konstrukteurs. Dabei bedingt die Berechnung nichtlinearer Toleranzketten einen erheblichen Zeitaufwand, wodurch meist auf deren genaue Berechnung vezichtet wird und Toleranzen stattdessen auf Basis von Erfahrungswerten festgelegt werden. Die vorgestellte Methodik zeigt Wege, wie schnell und frühzeitig im Konstruktionsprozess belastbare Aussagen zu Toleranzen komplexer Mechanismen getroffen werden können. Dazu werden sogenannte Sensitivitätsanalysen in der CAD-Software "Creo Elements" durchgeführt und ausgewertet. Das Ergebnis sind erste konkrete Toleranzfelder für alle den Mechanismus beschreibenden, geometrischen Abmessungen, welche sich als Startwerte für den anschließenden Toleranzsynthese/-analyseprozess eignen.
Teil 2 Marko Ebermann
Dieser zweite Vortragsteil behandelt eine mögliche Vorgehensweise zur Tolerierung von Geometrieabweichungen in der frühen Entwurfsphase am Beispiel des Koppelgliedes einer Verpackungsmaschine. Ausgangspunkt für die frühe Tolerierung bildet die im ersten Vortragsteil behandelte Sensitivitätsanalyse des Koppelgetriebes, welche Informationen zur Empfindlichkeit der Funktionsmaße bezüglich der Einhaltung der Schließmaßtoleranz lieferte. Die daraus abgeleitete Form- und Lagetolerierung des Koppelgliedes soll durch anschließende Toleranzamalysen die Tolerierung im Baugruppenkontext bestätigen und auf möglich Fertigungsverfahren abzielen, ohne die genaue Gestalt der Komponenten zu kennen. So können teure und zeitintensive Iterationsschleifen im Konstruktionsprozess minimiert und die Funktionalität frühzeitig gesichert werden.
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Cyrén, Oscar, and Moa Harryson. "Development of Methods and Guidelines for Upper Extremity Injury in Car Accidents." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31615.
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The project focus has been development of guidelines and methods for upper extremity injury reduction in car crashes. The safety of the central body parts improves which indicates the need to develop methods for avoiding non-life threatening injuries such as fracture of the arms. The purpose of the project was to study the injury mechanisms for the upper extremity in car crashes, and the aim has been to propose methods to reduce the injuries. The project focuses on adult occupants inside the vehicles front seat, and frontal and side impacts. The procedure began with understanding and identifying the injury mechanisms. Studies show that most fractures occur on the forearm (radius and ulna) and on the wrists and hands. To determine which injury mechanisms that were most frequent, data were collected from 29 computer simulations with 29 different crash scenarios. The most common kind of impact was the medial part of the wrist in the central part of the instrument panel, combined with the impact of the elbow in the center consol. The results of the simulations created a basis for the method of the component test, with focus on the injury mechanism i.e. the forward movement of the arms into the instrument panel. The component test consisted of a test rig, on which was mounted with a measuring arm of a 50th percentile male dummy. The arm dropped into a block of expanded polypropylene (EPP-block) for observation and study, and with following variable parameters: the impact angle of the surface, velocity and position of the wrist. Then also an instrumented measuring arm from a 5th percentile female dummy was released into an instrument panel. The project contributes to knowledge about the injury mechanism of the upper extremity in car crashes. The most frequent injury mechanism is a forward movement of the arms resulting in an impact with the interior structure of the car. The most frequent injured region is the distal part of the upper extremity. The project has developed and suggested the first step to a test method for the specific injury mechanism. There is a need of more research on how impact angles and velocity affect the violence on the arm.
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Innocenti, Nicolas. "What microcavities can do in photonics : coupling resonances and optical gain." Thesis, KTH, Beräkningsbiologi, CB, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-46569.
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The present master's thesis deals with numerical modeling of solid-state micrometrical-sized polymeric dye lasers, commonly denoted as microcavities. It is part of a large research initiative carried out in the optics group, at the MAP (Microelectronics and Applied Physics) department in KTH (Kungliga Tekniska Högskolan - Royal Technical School) and targeted towards the design and manufacturing of micro- and nano-scaled polymeric components for nano-photonics, primarily lasers. The finite element method (FEM) in frequency domain is used as a primary modeling tool through the simulation software COMSOL Multiphysics. Models for spontaneous emission, optical losses and gain are developed and demonstrated. A specic layout is studied: the double hexagonal microcavity. While it was expected to be a good candidate for a laser, the design shows unexpected properties making it useful for sensing applications. Finally, the transposition of models to time domain is initiated : a replacement solution for the lacking perfectly matched layer (PML) in Comsol is developed and demonstrated. Methods for modeling materials parameters in time domain are investigated, together with the possible use of a more suitable algorithm : finite dierences in time domain (FDTD) or Yee's scheme.
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Jeong, Namin. "A surfacelet-based method for constructing geometric models of microstructure." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54438.
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Integration of material composition, microstructure, and mechanical properties with geometry information enables many product development activities, including design, analysis, and manufacturing. To address such needs, models of material composition have been integrated into CAD systems, creating systems called heterogeneous CAD modeling. In order to support the heterogeneous CAD system, extensive process-structure-property relationships have to be captured and integrated into current CAD system. A new method for reverse engineering of materials will be presented such that microstructure models can be constructed and used in the heterogeneous CAD system.
Reverse engineering of material consists of three parts: image analysis, structure-property-process relationship, and repository. In this research, an image processing method, which comprises the Radon transform and the wavelet transform, will be used in order to recognize geometric features from a microstructure image. Recognizing geometric features can be obtained by combinations of three techniques, masking, clustering, and high frequency component on wavelet transform, that are integrated with the Radon transform. Then, recognized geometric features can be used to construct an explicit geometric model of microstructure. The proposed work will provide an explicit mathematical method to recognize and to quantify microstructure features from an image. In addition, explicit geometric models of microstructure can be automatically constructed and utilized to get effective mechanical properties, establishing structure-property relationship of the material. In order to demonstrate this, polymer nano-composite sample and metal alloy sample will be used.
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TANG, Yihao, and Hui ZHU. "Test method development by use of SOM-GRNN." Thesis, KTH, Fordonsdynamik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-243286.
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The relationship between Objective Metrics (OM) and Subjective Assessments (SA) has been analyzed by people using different methods. This paper continues Gaspar Gil Gómez’s research over test method development by use of SOM-GRNN, aiming to find correlations between OM and SA. In this paper, CAE simulation is performed to analyze the relationship between OM and vehicle parameters. First impression test is refined and one more dataset has been added in order to populate SOM-GRNN map. This paper also conducts analysis over SOM and GRNN algorithms, and explores several possible applications using SOM-GRNN map. Finally the whole SOM-GRNN system is integrated and a User Interface is built in GUI for future research and application. The system can still be improved by populating database, refining SA evaluation method and optimizing SOM-GRNN training algorithms.<br>Relationen mellan målmetri (OM) och subjektiv bedömning (SA) har analyserats av personer som använder olika metoder. I detta dokument fortsätter Gaspar Gil Gómezs forskning kring testmetodutveckling med hjälp av SOM-GRNN, som syftar till att finna korrelationer mellan OM och SA. I detta papper utförs CAE-simulering för att analysera förhållandet mellan OM och fordonsparametrar. Första intryckstestet är raffinerat och ytterligare en dataset har lagts till för att fylla i SOM-GRNN-kartan. I detta dokument analyseras även SOM- och GRNN-algoritmer, och undersöker flera möjliga tillämpningar med hjälp av SOM-GRNN kartan. Slutligen är hela SOM-GRNN-systemet integrerat och ett användargränssnitt är byggt i GUI för framtida forskning och tillämpning. Systemet kan fortfarande förbättras genom att fylla i databasen, förädla SA utvärderingsmetod och optimera SOM-GRNN träningsalgoritmer.
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Cao, Thanh Dung [Verfasser]. "Methods to improve throughput and energy need in movement strategies of storage vehicle / Thanh Dung Cao." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2018. http://d-nb.info/1219965618/34.
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Nateghi, Bahman. "Une methode orientee edif pour la conception des vlsi, et realisation de son systeme de cao." Paris 6, 1988. http://www.theses.fr/1988PA066435.
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Ce memoire traite de la conception assistee par ordinateur dans le domaine des circuits electroniques a haut niveau d'integration, en presentant une methode de conception pour ces circuits, et la chaine d'outils logiciels adaptes a cette methode. La premiere partie critique deux methodologies de conception typiques dans ce domaine. La seconde partie decrit les differentes phases de la methodologie s'inscrivant dans le cadre de la norme edif. La troisieme partie presente plusieurs outils de cao developpes au cours de l'etude, a savoir: une chaine complete d'edition; une chaine complete de verification; un routeur de canal; un routeur global; des post-processeurs de traduction et de visualisation
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Johnson, Robert A. "A Comparison Between Two-Dimensional and Three-DimensionalAnalysis, A Review of Horizontal Wood Diaphragms and a Case Study of the Structure Located at 89 Shrewsbury Street, Worcester, MA." Digital WPI, 2008. https://digitalcommons.wpi.edu/etd-theses/524.
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A two-dimensional structural analysis design approach has been the universally accepted method for a small structural engineering design firm. The tools to perform the analysis have been paper and pencil, calculators and more recently personal computers with two-dimensional software. With the introduction of three-dimensional software, a major shift is occurring on how small structural engineering firms approach analysis and design. This thesis research reviews the analysis of an existing building utilizing the standard two-dimensional approach, including horizontal diaphragm-action within wood floors. This study also reviews the research performed on horizontal diaphragms and investigates the use of three-dimensional, finite element modeling (RISA-3D) for the analysis of horizontal diaphragms. It is shown that the three-dimensional model can provide results similar to the two-dimensional hand calculations. However, the thickness of the diaphragm elements has to be significantly modified for flexible diaphragm action. The experience described herein is useful for structural engineer interfacing within three-dimensional CAD systems. The thesis concludes with a discussion on the challenges facing small structural engineering firms, including computer based technologies, engineering expertise to develop contract documents and review shop drawings, and outsourcing of design services.
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Sodomka, Pavel. "Optimalizace chlazení koncentrátorového fotovoltaického článku pomocí systémů CAE." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221145.
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This thesis deals with the optimization of the concentrate photovoltaic cell cooling system through the CAE system. In the theoretical part, the thesis treats there the problematic of the photovoltaics and focuses on the concentrator cell and its problems coupled with the cooling system and the sink of heat. In the next theoretic part, it also analyses there the problematic of the conduit and transfer of heat. Moreover, the mathematical description of the fluid flow, the finite-volume method that is used in the SolidWorks Flow Simulation for the calculations, are also described there. In the practical part, the models and steps which depict precisely all the process of the heat cooling optimization are mentioned. All the proposed variants are mutually compared and put up for the discussion about their advantages and disadvantages. Lastly, the resultant model was also put through the simulation with the suggested radiational component that gave precision to the results. In the end of the thesis, there was made out the documentation of the final model drawings.
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Kato, Jien, Toyohide Watanabe, Sebastien Joga, et al. "An HMM-based segmentation method for traffic monitoring movies." IEEE, 2002. http://hdl.handle.net/2237/6744.
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Harper, Brian Davidson. "CAD methods to support automated De- and remanufacture assessments." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/16741.
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Grieve, M. D. "Self-adaptive methods for computer-aided design of electromagnetic systems." Thesis, University of Aberdeen, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382136.
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Sedláček, Petr. "Pevnostní a modální analýza v parametrických adaptivních CAD programech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218805.
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This thesis is focusing on the use of the finite element method (FEM) in program environment of Autodesk Inventor Professional (AIP) 2010. For the analysis of the components or assemblies with FEM serves the Strength analysis module of the AIP 2010, whose environment and functions are detailed in this thesis. At the conclusion practical examples of modal and static analysis on the synchronous generator rotor model are demonstrated including a brief evaluation of the results.
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Mekhnacha, Kamel. "Méthodes Probabilistes Bayesiennes pour la prise en en compte des incertitudes géométriques : Application à la CAO-Robotique." Phd thesis, Grenoble INPG, 1999. http://tel.archives-ouvertes.fr/tel-00010472.
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Cette these porte sur l'utilisation du formalisme bayesien pour la repr´esentation et la manipulation des incertitudes geometriques dans les systemes de Robotique et de CAORobotique. Dans ces systemes, l'utilisation d'un modele geometrique de l'environnement est indispensable. Toutefois, la validite des calculs conduits sur ces mod`eles n´ecessite une repr´esentation des ecarts entre le modele et la realite et une prise en compte de ces ecarts lors de la resolution d'un probleme donne. L'approche proposee repr´esente une extension de la notion de specification par contraintes geometriques dans laquelle la dimension incertaine des modeles est prise en compte. Cette extension consiste a specifier les contraintes sur les positions relatives entre diff´erents corps de l'environnement non pas par de simples equations et inequations, mais par des distributions de probabilite sur les parametres de ces positions. A l'issue de cette specification, une distribution conjointe sur l'ensemble des parametres du modele est construite. Pour un probleme donne, la distribution marginale sur les parametres inconnus de ce dernier est inferee en utilisant les regles des probabilites. La resolution de ce probleme revient a optimiser cette distribution comportant, dans le cas general, une integrale portant sur un espace de grande dimension. La methode de resolution utilisee pour approcher ce double probleme d'integration/optimisation est basee sur un algorithme genetique. Cet algorithme permet en particulier de controler la precision de l'estimation numerique des integrales par une m´ethode stochastique de Monte-Carlo. L'implantation d'un systeme prototype de CAO nous a permis une experimentation assez poussee de l'approche propos´ee. La mise en oeuvre de plusieurs applications robotiques, dont les natures peuvent paraıtre tres differentes, a ete possible grace a la souplesse de la methode de specification utilisee et la robustesse de la methode de resolution implantee.