Дисертації з теми "2D and 3D fabric structures"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-42 дисертацій для дослідження на тему "2D and 3D fabric structures".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Schneider, Judith. "Dynamical structures and manifold detection in 2D and 3D chaotic flows." Phd thesis, [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973637420.
Повний текст джерелаShi, Daniel. "Etude de structures drainantes (du 2D au 3D) par analyse d'images." Saint-Etienne, 1993. http://www.theses.fr/1993STET4030.
Повний текст джерелаKang, Seungyeon. "Femtosecond laser direct writing of 3D metallic structures and 2D graphite." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11495.
Повний текст джерелаEngineering and Applied Sciences
Shaar, Nader S. (Nader Salah). "Assembling 3D MEMS structures by folding, aligning and latching 2D patterned films." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87983.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 116-121).
The techniques used in the fabrication of micro-electro-mechanical systems (MEMS) were adopted from the integrated circuits (IC) industry and are mostly limited to patterning thin films on a flat substrate. As a consequence, micro-machined devices mostly comprise sets of flat two-dimensional (2D) membranes with etched patterns and undercuts that enable them to serve their intended functions. However, many mechanical, optical and biological applications, such as corner-cube retro reflectors, micro-scale magnetometers, 3D microfluidic systems and 3D photonic crystals, require three-dimensional (3D) geometries for their functionality. In addition, 3D circuits have also emerged as a way of improving connectivity and reducing power dissipation in electronic chips. However, the creation of fully 3D structures via conventional MEMS fabrication techniques typically requires processes that have low throughput, limited control over the final geometry, and higher costs. A promising alternative to 3D microfabrication that addresses these challenges while requiring minimal investment in a new infrastructure is to use the existing technologies to pattern in 2D, and then assemble the patterned segments into 3D structures. Demonstrated methods to achieve that objective have been limited in scope, requiring manual assembly or with limited applicability to specific architectures. This thesis presents a coherent modular system for folding, aligning and latching 2D-patterned precursors into prescribed 3D structures. The system presented here comprises flexure hinges to enable relative motion among the 2D precursors, a cascaded alignment system to provide progressively better alignment among precursors as they approach their final positions, and systems of reversible latches to retain the assembly in its final configuration while, optionally, permitting disassembly and reassembly of the structure. In particular, two types of systems are considered. First, the design, fabrication and testing of polymer structures with metal hinges, cascaded alignment features and integrated latching mechanisms are presented for perpendicular assembly of structures. Second, an alternative latching technique using controlled melting of photoresist polymer adhesive pads is analyzed and tested for the parallel assembly of structures. The structures discussed in this thesis consist of SU-8 polymer segments patterned on silicon wafers and linked with an underlying thin gold pattern that defines the hinges. The elasto-plastic bending of the hinges is analyzed and simulated to predict the trajectory and angular position of the membranes during folding. The design of cascaded alignment features, consisting of triangular protrusions and corresponding rhombic holes, is discussed. A kinematic model of the alignment mechanism is presented to demonstrate the effectiveness of the cascading aspect of the design to achieve a large range of angular correction and high alignment accuracy at the same time. The design of micro snap-fit latches that work in conjunction with the alignment system is also presented, and quasi-static simulations of the elastic bending of latches is used to evaluate their strength. Experimental measurements were conducted to characterize the behavior of the gold hinges during bending, demonstrating good agreement with models. The integrated folding-alignment-latching system was demonstrated by assembling corner-cube structures. The alignment process was found to be accurate to within 1 from measurements of the final assembled position of the corner cube structure. The system was also shown to support fabricating reconfigurable devices by demonstrating the ability to unlatch and re-latch segments. The latching and unlatching forces were measured to be 9.7 [mu]N and 12.3 [mu]N respectively.
by Nader S. Shaar.
Ph. D.
Schumacher, Matthaeus [Verfasser]. "Model-based estimation of missing facial structures in 2D and 3D / Matthaeus Schumacher." Siegen : Universitätsbibliothek der Universität Siegen, 2018. http://d-nb.info/1161942882/34.
Повний текст джерелаMarin, Philippe. "Contrôles des calculs de structures 2D et 3D élastiques incompressibles et quasi incompressibles." Paris 6, 1991. http://www.theses.fr/1991PA066228.
Повний текст джерелаZAPPINO, ENRICO. "Variable kinematic 1D, 2D and 3D Models for the Analysis of Aerospace Structures." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2573739.
Повний текст джерелаBadawi, Said Sobhey. "Development of the Weaving Machine and 3D Woven Spacer Fabric Structures for Lightweight Composites Materials." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1195729741274-93895.
Повний текст джерелаDie Ziele der Arbeit bestanden in der Entwicklung der Geometrie der Spacer Fabrics und der notwendigen Falteneinrichtung an der Bandwebmaschine. Spacer Fabrics werden ausschließlich aus zwei Deckflächen, die durch eingewebte Stege verbunden sind, gefertigt. Zur Entwicklung der Spacer Fabrics muss eine Doppelnadel-Bandwebmaschine mit zwei Webfächern eingesetzt werden. Für die Faltenwebeinrichtung werden der entwickelte Extra-Kettablass und der Extra-Abzug benötigt. Der Antrieb und die Steuerung des Extra-Abzuges erfolgen durch einen Synchronantrieb und der Antrieb und die Steuerung des Extra-Ablasses durch Pneumatik.Eine frei programmierbare Steuerung der Faltenwebeinrichtung ermöglicht eine sichere und optimierte Synchronisation zwischen Webprozess und Faltenbildung. Im Ergebnis einer systematischen Strukturentwicklung von Spacer Fabrics und der Simulation ihrer günstigen Herstellung mittles eines speziell entwickelten Slippage Strength Tests werden die optimalen Strukturen ermittelt. Die experimentellen Untersuchungen bringen grundlegende Erkenntnisse für die folgenden Forschungsschritte zur Entwicklung von gewebten Spacer Fabrics mit Hochleistungsgarnen auf Doppelgreiferwebmaschinen
Wu, Xiao. "Fabrication of 1D, 2D and 3D polymer-based periodic structures by mass transport effect." Thesis, Cachan, Ecole normale supérieure, 2013. http://www.theses.fr/2013DENS0058/document.
Повний текст джерелаWe have theoretically and experimentally investigated the formation of both active and passive surface relief gratings on two kinds of photosensitive polymers: negative photoresist and azobenzene copolymer. The common mechanism of the structures formation was attributed to mass transport effect, which however pushes the materials in opposite directions in these two materials. The fabrication technique is based on the use of interference lithography, which allowed to create large and uniform structures. In the first case, 1D and 2D passive periodic surface relief structures were created on the negative photoresist SU8 thanks to the shrinkage effect during the crosslinking process. In the second case, 1D, 2D and 3D active periodic structures have been obtained thanks to the movement of DR1/PMMA copolymer materials from regions of high intensity to those of low intensity irradiation. The modulation amplitude of structures is optimized by controlling the film thickness, the structure periodicity, the exposure dosage, and the polarizations of interference laser beams. Applications of these structures for multiple wavelength DFB laser, nonlinear photonic crystals, and waveguide coupling have been discussed
MEZERREG, MOHAMED. "Structures de donnees graphiques : contribution a la conception d'un s.g.b.d. images 2d et 3d." Paris 7, 1990. http://www.theses.fr/1990PA077155.
Повний текст джерелаKhan, Ridita Rahman. "Modeling, Simulation and Characterization of Optoelectronic Properties of 2D-3D CoO-ATO Nano Structures." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7414.
Повний текст джерелаDalal, Mohamed. "Contribution à l'étude de la saturation des tissus simples et multicouches : tissus 2D et 3D." Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-00841290.
Повний текст джерелаBertani, Gregorio. "Wind loading on elongated structures characterized by bluff sections: comparison between 2D and 3D simulations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22291/.
Повний текст джерелаGünther, Thomas. "Inversion methods and resolution analysis for the 2D/3D reconstruction of resistivity structures from DC measurements." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-4152277.
Повний текст джерелаGennesson, Marvin. "Étude expérimentale de la mise en place des structures de solidification dans les lingots d'acier." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0278/document.
Повний текст джерелаImproving the solidification of large industrial steel ingots remains a scientific challenge. During casting chemical heterogeneities (macrosegregation), sometimes in the scale of meters, can arise. Solid grain motion is one phenomena responsible for macrosegregation. Inoculation allows the number, size and morphology of these grains to be modified through additions to the liquid metal. In this work 42CrMo4 and 34Cr4 grade steel ingots of several sizes were modified with potential inoculants. Characterization techniques (2D and 3D) were developed to compare dendritic solidification structures before and after inoculation. The first series of small ingots (50 g) showed grain refinement for powder additions with a low lattice misfit between the inoculant and solidifying melt, and a coarsening effect when ferrocerium was added. The best inoculant candidates (TiN, CeO2, Si3N4 powders and cerium ferroalloy) were tested in medium sized ingots, after which the cerium addition was tested with a 6,2 t industrial ingot. Cerium is responsible for coarsening the grain size in all sizes of cast ingots investigated. This is likely due to a modification of the solid/liquid and liquid/mold interfacial energy along with the replacement of existing sites with cerium inclusions which are not active during nucleation
La, Rochette Hélène de. "Latchup déclenché par ion lourd dans des structures CMOS-1 mum : approche expérimentale, simulation 2D et 3D." Montpellier 2, 1995. http://www.theses.fr/1995MON20003.
Повний текст джерелаSilva, Alessandro Márcio Hakme da. "Análise morfométrica 2D e 3D de amostras de osso trabecular utilizando microtomografia tridimensional por raio-X." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-29062010-112929/.
Повний текст джерелаTrebecular bones have a porous microstructure and can be modeled as a linear elastic solid, heterogenous and anisotropic. The x-ray tridimensional microtomography (\'mü\'CT) has been worldwide used for the assessment of trabecular bone in investigations related to bone quality and aimed to the diagnostic of bone metabolic diseases such as osteoporosis. In the literature few investigations have compared the 2D and 3D morphometric analysis of trabecular bone. In this investigation cylindrical trabecular bone samples were harvested from bovine head femur to carry out that comparison by \'mü\'CT. The CT-Analyser software was used to measure in three directions (superior-inferior, lateral-medial and anterior-posterior) several microstructural trabecular parameters such as trabecular thickness, trabecular separation, trabecular number and the eigenvalues of the fabric tensor (M). The comparison between the parameters values measured by 2D and 3D morphometric analysis was performed by the paired-sample t test with a level of significance p < 0,05 and the Pearson\'s linear correlation. The eigenvalues show that the bovine trabecular microstructure has a tendence to transverse isotropy symmetry. The results show that x-ray tridimensional microtomography (\'mü\'CT) is a technique of great potential for characterization of generating good bone quality parameters for the diagnosis of diseases of bone metabolism.
Liao, Wei [Verfasser], and Karl [Akademischer Betreuer] Rohr. "Minimal Path Methods for Segmentation and Analysis of 2D and 3D Line Structures / Wei Liao ; Betreuer: Karl Rohr." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177149915/34.
Повний текст джерелаMorariu, Cosmin Adrian [Verfasser], and Josef [Akademischer Betreuer] Pauli. "Extraction of Complex Fine Structures in 3D & 2D Medical Image Data / Cosmin Adrian Morariu ; Betreuer: Josef Pauli." Duisburg, 2019. http://d-nb.info/1191692256/34.
Повний текст джерелаNilsson, Erik, and Goidaragh Safiyeh Alizadeh. "Kundnyttan av Tekla Structures som verktyg i broprojektering." Thesis, KTH, Byggteknik och design, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-125749.
Повний текст джерелаThe building industry is going trough a transitional stage, from 2D to 3D. BIM, as a working method, and 3D models are becoming more common. In bridge project however, the demand for 3D models is low. At WSP in Stockholm the 3D modelling program Tekla Structures is widely used in several departments. There is a desire to expand the usage of the program also when it comes to bridge planning. To make that possible a bigger request by the customers is required. The purpose of this thesis is to evaluate Tekla Structure as a tool from a customer perspective and to analyse the customer values by using Tekla models. To shed light on this issue interviews have been made with different customers of WSP. The customers’ needs and their reflections on BIM and Tekla Structures in bridge projects are mapped out and analysed. Aspects reached by the customers have served as a basis for analyse of a 3D model, built up in Tekla Structures, as well as two bridges – already modelled in the same program. The analysis shows that there is a big customer value by using Tekla models in bridge projects, but to enable management models great efforts are required. An evaluation of the software also shows both strengths and weaknesses. In the following pages the result is presented.
Wikström, David, and Tobias Karlemi. "Varför BIM?" Thesis, Jönköping University, JTH, Civil Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1370.
Повний текст джерелаIs the new technology always the best? This final project tries to determine if BIM is the melody of today, or if traditional 2D drawing is recommended. Perhaps a compromise is necessary, utilizing both methods.
In order to answer this question, different views from the industry have been retrieved through reports, producers of software and users. The approach has consisted in building a 3D model of the school Råslättsskolan, house 01, along with interviews with people involved in the building process.
When working in 2D it is hard to include the third dimension, mistakes are done and collisions happen that must be corrected, in most cases at the construction site. BIM is an incredible help since the model allows you to detect collisions and correct them. Another time when models are preferred is when you need production plans, for example, different steel details that will be joined together at the work shop before shipping to the construction site.
Skanska and NCC, in densely developed urban areas, already require BIM today, something that most likely will be customary within the nearest future. It is not hard to understand that more and more clients require BIM when you realize its advantages. With the correct method, these 3D models can minimize risks of errors, optimize the production and save money.When it comes to introducing BIM today at BGK the students can’t do anything but make a recommendation. The improved quality, the future prospect and that the advantages of BIM is not depending by project size will make it attractive for BGK to begin a transition already today. BIM is the melody of the future, not the only song being sung, but clearly the strongest one.
Zieger, Markus Michael [Verfasser], and C. [Akademischer Betreuer] Barner-Kowollik. "Designing Functional 2D and 3D Structures: From Ultrathin Coatings to Laser Lithography / Markus Michael Zieger ; Betreuer: C. Barner-Kowollik." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1182430627/34.
Повний текст джерелаJacques, Isabelle. "Aspects combinatoires en modélisation 2D et 3D et application à l'énumération des cartes et des solides." Mulhouse, 1991. http://www.theses.fr/1991MULH0185.
Повний текст джерелаJia, Hongjun. "A study of the missing data problems in 3D structure reconstruction and 2D face recognition." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1235750224.
Повний текст джерелаEhlke, Moritz [Verfasser], Olaf [Akademischer Betreuer] Hellwich, Olaf [Gutachter] Hellwich, Bernhard [Gutachter] Preim, and Stefan [Gutachter] Zachow. "3D reconstruction of anatomical structures from 2D X-ray images / Moritz Ehlke ; Gutachter: Olaf Hellwich, Bernhard Preim, Stefan Zachow ; Betreuer: Olaf Hellwich." Berlin : Technische Universität Berlin, 2021. http://d-nb.info/1230468536/34.
Повний текст джерелаIndelicato, Giuliana. "Modèles mécaniques de réseaux de fibres 2D et de textiles." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL009N/document.
Повний текст джерелаIn this work, we discuss three basic problems related to the mechanical behavior of textile materials. First, we extend the model of Wang and Pipkin for textiles, described as networks of inextensible fibers with resistance to shear and bending, to a model in which resistance to twist of the individual fibers is taken into account, by including torsion contributions in the elastic stored energy. As an example, we study the behaviour of a cylindrical shell made of helical fibers. Second, we study how the geometry of the weave pattern affects the symmetry properties of the deformation energy of a woven fabric. For networks made by two families of fibers, four basic types of weave patterns are possible, depending on the angle between the fibers and on their material properties. The symmetry properties of the pattern determine the material symmetry group of the network, under which the stored energy is invariant. In this context, we derive representations for the deformation energy of a woven fabric that are invariant under the symmetry group of the network, and discuss the relation of the resulting group invariants with the curvature of the fibers. Third, we develop a model for textiles viewed as surfaces with microstructure, using a modification of the classical Cosserat model for shells, in which the microstructure accounts for the undulations of the threads at the microscopic scale. Describing the threads as Euler's elastica, we derive an explicit expression for the microscopic elastic energy that allows to set up a simple model for the macroscopic mechanical behavior of textiles
Au, Thi Huong. "Optimisation et manipulation d'une source de photons uniques par des structures photoniques 2D et 3D à base de matériau polymère à température ambiante." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN046.
Повний текст джерелаThe thesis has been devoted to study the controlled coupling of a colloidal quantum dot (QD) based single photon source (SPS) into multidimensional polymeric photonic structures by using low-one photon absorption (LOPA) direct laser writing (DLW) technique. The thesis consists of three main parts:The first part addresses the characteristic optimization of the CdSe/CdS based SPS. The excitation wavelength dependence of the QDs was investigated. By using 532 nm, only the core of the QD is excited with the suppression of the Auger effects. Thus, this approach allows for obtaining the suppression of fluorescence intermittency and a stable single-photon emission at ambient conditions. In order to obtain the long-term high fluorescence quality of the QDs, we then studied the influence of the local dielectric medium on the optical properties of the QDs. By incorporating the QDs into a photoresist (SU-8), we demonstrated that the polymeric environment not only enables the long-term preservation of the QD with high photostability but also provides us excellent accessibility to fabricate polymeric structures containing SPS.In the second part, the LOPA-based DLW is employed for the coupling of single QD into various photonic structures. Two devices including submicropillar dielectric antenna and 3D membrane bulleye cavity are theoretically and experimentally investigated to enhance the fluorescence emission of the single QD in terms of far-field angular radiation pattern and the spontaneous radiative emission of the emitter.In the third part, the manipulation of SPS is demonstrated by coupling the single QD into multidimensional magneto-photonic structures. With the aid of an external magnetic field, the controllable movement of the coupled QD was performed in the fluidic environment. The position and orientation of the SPS coupled in the structure were manipulated on demand. The mechanical, magnetic and optical properties of the device are investigated showing the multifunctional capabilities of magneto-photonic structures
Bognet, Brice. "Stratégies numériques avancées pour la simulation de modèles définis sur des géométries de plaques et coques : solutions 3D avec une complexité 2D." Phd thesis, Ecole Centrale de Nantes (ECN), 2013. http://tel.archives-ouvertes.fr/tel-01021762.
Повний текст джерелаApedo, Komla Lolonyo. "Numerical modelling of inflatable structures made of orthotropic technical textiles : application to the frames of inflatable tents." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10145.
Повний текст джерелаThe main objective of this thesis was to model inflatable beams made frorn orthotropic woven fabric composites. The static aspects were investigated in this report. Before planning to develop these models, it was necessary to know all the parameters which have a direct effect on the effective mechanical properties these composites. Thus, a micro mechanical model was performed for predicting the effective mechanical properties. The proposed model was based on the analysis of the representative volume element (RVE). The model took into account not only the mechanical properties and volume fraction of each components in the RVE but also their geometry and architecture. Each yarn in the RVE was modelled as a transversely isotropic material (containing fibres and resin) using the concentric cylinders model (CCIVI). A second volumetric averaging which took into account the volume fraction of each constituent (warp yarn, weft yarn and resin), was performed. The model was validated favorably against experimental available data. A parametric study was conducted in order to investigate the effects of various geometrical and mechanical parameters on the elastic properties of these composites. ln the structural analysis, a 3D Timoshenko airbeam with a homogeneous orthotropic woven fabric (OWF) was addressed. The model took into account the geometrical nonlinearities and the inflation pressure follower force effect. The analytical equilibrium equations were performed using the total Lagrangian form of the virtual work principle. As these equations were nonlinear, in a first approach, a linearization was performed at the prestressed reference configuration to obtain the equations devoted to linearized problems. As example, the bending problem was investigated. Four cases of boundary conditions were treated and the deflections and rotations results improved the existing models in the case of isotropic fabric. The wrinkling load in every case was also proposed. In a second approach, the nonlinear equilibrium equations of the 3DTimoshenko airbeam were discretized by the finite element method. Two finite element solutions were then investigated : finite element solutions for linearized problems which were obtained by the means of the linearization around the prestressed reference configuration of the nonlinear equations and nonlinear finite element solutions which were performed by the use of an optimization algorithm based on the Qua.si-Newton method. As an example, the bending problem of a cantilever inflated beam under concentrated load was considered and the deflection results improve the theoretical models. As these beams are made from fabric, the beam models were validated through their comparison with a 3D thin-shell finite element model. The influence of the material effective properties and the inflation pressure on the beam response was also investigated through a parametric study. The finite element solutions for linearized problems were found to be close to the theoretical linearized results. On the other hand, the results for the nonlinear finite element model were shown to be close to the results for the linearized finite element model in the case of high mechanical properties and the non linear finite element model was used to improve the linearized model when the mechanical properties of the fabric are low
Leplay, Paul. "Identification de comportements mécaniques et à rupture par corrélation d'images 2D et 3D : Application aux filtres à particules Diesel à base de titanate d'aluminium." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00716670.
Повний текст джерелаGeyer, Simone [Verfasser], and S. [Akademischer Betreuer] Scholpp. "Establishment of a three-dimensional cell culture system to study tubular structures - A comparative study of neuronal differentiation in zebrafish and in 2D and 3D zebrafish primary cell culture / Simone Geyer. Betreuer: S. Scholpp." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1112224580/34.
Повний текст джерелаVilfayeau, Jérôme. "Modélisation numérique du procédé de tissage des renforts fibreux pour matériaux composites." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0026/document.
Повний текст джерелаThe aeronautical industry faces new challenges regarding the reduction of fossil fuel consumption. One way to address this issue is to use lighter composite materials. The ability to predict the geometry and the mechanical properties of the unit cell is necessary in order to develop 3D reinforcements in composite materials for these aeronautical applications. There is a difficulty to get realistic geometries for these unit cells due to the complexity of their architecture. Currently, existing tools which model 3D fabrics at a meso scale don't take into account manufacturing process influence on the shape modification of the textile structure. There is already some numerical tools that can model the braiding or knitting process, but none have been developed for weaving so far. Consequently, this study deals with the numerical simulation of the weaving process to obtain a deformed dry fabric structure. During the weaving process of E-glass fabrics, achieved in our laboratory, it has been observed that large deformations led to the modification of transverse section of meshes, or local density changes, that can modify the fabrics mechanical resistance. For this reason, a numerical tool of the weaving process, based on finite element modelling, has been developped to predict these major deformations and their influences on the final textile structure. The correlation between numerical results and fabrics produced with glass fibres has been achieved for plain weave and 2-2 twill
LIAO, SHANG-YU, and 廖尚宇. "Comparison of 2D and 3D Finite Element Analysis of Package Structures." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/79490544155768059703.
Повний текст джерела中華大學
機械工程學系
105
The continuous development of IC has the electronic components thin, compact and versatile which makes our lives more convenient. Any components in the electronic packaging are important not only for telecommunications but also strength its mechanical structure, therefore, the reliability of any components becomes a study topic of the researchers. The thermal-mechanical behavior of a packaging was investigated under 265 °C high temperature loading and down to room temperature 25 °C. In order to discuss the thermal behavior of the central section of the package structure, both 2D and 3D finite element models were created and compared. Due to small thickness of the packaging, the layer 3D solid element was selected in 3D finite element model and higher order element was used in both models to improve the convergence problem. At high temperature, the displacement of model A is about 4 m, the displacement of model B and model C is about 3.2 m, and the displacement is about 2.1 m to 2.5 m at room temperature, and model C is the largest. The equivalent stress is about 896 MPa to 1140 MPa at high temperature, and the model B is the largest. The equivalent stress is about 642 MPa to 711 MPa at room temperature, and model B is the largest. The average equivalent stress was about 37 % lower. The 2D finite element model at high temperature showed that the deformation of model A and C in x direction is greater than 20 % of the 3D finite element model. In addition to model C, the y-direction deformation of other models was less than 20 % of the 3D finite element model. At room temperature, the 2D finite element model showed that the deformation of all models was greater than that of the 3D finite element model by 17~31 %. The y-direction deformation of all models was greater than that of the 3D finite element model. The 2D finite element model at high temperature showed that the equivalent stress of all models is less than that of 3D finite element model by 25 %, and 40 % was found in back to room temperature. The 3D structure was not very reasonable by infinite long structure and can be simplified to 2D structure, but the displacement and stress distribution of 2D analysis results can be qualitatively compared with 3D analysis results
Tzu-WeiWang and 王子維. "Perovskite solar cell with 2D/3D stacking structures formed by spin coating." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/x7563q.
Повний текст джерелаWeinkauf, Tino [Verfasser]. "Extraction of topological structures in 2D and 3D vector fields / von Tino Weinkauf." 2008. http://d-nb.info/98960702X/34.
Повний текст джерелаSchneider, Judith [Verfasser]. "Dynamical structures and manifold detection in 2D and 3D chaotic flows / Judith Schneider." 2004. http://d-nb.info/973637420/34.
Повний текст джерелаShashua, Amnon. "Geometric and Algebraic Aspects of 3D Affine and Projective Structures from Perspective 2D Views." 1993. http://hdl.handle.net/1721.1/7216.
Повний текст джерелаBadawi, Said Sobhey [Verfasser]. "Development of the weaving machine and 3D woven spacer fabric structures for lightweight composites materials / Badawi, Said Sobhey." 2007. http://d-nb.info/987189700/34.
Повний текст джерелаGünther, Thomas. "Inversion methods and resolution analysis for the 2D/3D reconstruction of resistivity structures from DC measurements." Doctoral thesis, 2004. https://tubaf.qucosa.de/id/qucosa%3A22516.
Повний текст джерелаKuo, Jen-Hao, and 郭人豪. "Low Voltage and High Transmittance Blue Phase Liquid Crystal Displays with 2D/3D Continuous Electrode Structures." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4zv38g.
Повний текст джерела國立臺灣大學
光電工程學研究所
106
Blue phase liquid crystal display is a popular research topic for the liquid crystal display. Because of its sub-millisecond response time and its display without alignment layer that make it be fabricated easier. However, the primary problems of blue phase liquid crystal are low transmittance and high operating voltage. Many theses aim to design different electrode structures to improve the high operating voltage and low transmittance. Most theses aim to design two-dimension electrode structures about parameters on X-Z direction. Therefore, we design the three-dimension electrode structures and hope that new structures can reduce the dead zone on y-direction. At first, we refer to three kinds of 2D electrode structures to design three kinds of 3D electrode structures. We discover that 3D electrodes have the problem of central dead zone and the problem influence the transmittance of the display. After the analysis, the 2D electrodes still have the highest transmittance. However, 3D electrodes also have their advantage. 3D electrodes have higher transmittance at low operating voltage if the electrode gap is small. Then we refer to Diamond-shape electrodes to design continuous electrodes to reduce the central dead zone on expectation so we compare continuous electrodes with Diamond-shape electrodes first. The result is that the pointed diamond electrodes have higher transmittance in comparison with Diamond-shape electrodes generally ( ). The enhanced Diamond electrodes have higher transmittance and lower operation voltage in comparison with Diamond-shape electrodes. In the end, we compare continuous electrodes with 2D and 3D electrodes. Among 2D, 3D triangle and pointed diamond electrodes, 2D triangle electrodes have the highest transmittance with large gap but 3D triangle electrodes have the higher transmittance at low voltage with small gap. Pointed diamond electrodes have high transmittance over 75% with most electrode gaps. Among 2D, 3D enhanced trapezoid and enhanced diamond electrodes, 2D enhanced trapezoid electrodes have the highest transmittance with large gap but 3D enhanced trapezoid electrodes have the higher transmittance at low voltage with small gap. Enhanced diamond electrodes have high transmittance over 80% with most electrode gaps. In terms of transmittance vs electrode gaps, continuous electrodes combine the features of 2D and 3D electrodes. Continuous electrodes have less sensitivity on electrode gaps compared to 2D and 3D electrodes with reasonably high transmittance.
Günther, Thomas [Verfasser]. "Inversion methods and resolution analysis for the 2D/3D reconstruction of resistivity structures from DC measurements / vorgelegt von Thomas Günther." 2004. http://d-nb.info/977715558/34.
Повний текст джерелаJerbi, Taha. "Recalage de structures tridimensionnelles à partir d'acquisitions stéréo-radiographiques basse dose. Application à l'estimation de mouvements humains." Phd thesis, 2012. http://tel.archives-ouvertes.fr/tel-00719664.
Повний текст джерела