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Dissertations / Theses on the topic 'Triangular mesh'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Lambert, Claire. "Adaptive triangular mesh generation." Thesis, Manchester Metropolitan University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296485.

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2

COELHO, JEFERSON ROMULO PEREIRA. "AN EFFICIENT SOLUTION FOR TRIANGULAR MESH SUBDIVISION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23865@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Subdivisão de superfícies triangulares é um problema importante nas atividades de modelagem e animação. Ao deformar uma superfície a qualidade da triangulação pode ser bastante prejudicada na medida em que triângulos, antes equiláteros, se tornam alongados. Uma solução para este problema consiste em refinar a região deformada. As técnicas de refinamento requerem uma estrutura de dados topológica que seja eficiente em termos de memória e tempo
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3

Kunert, Gerd. "A posteriori error estimation for anisotropic tetrahedral and triangular finite element meshes." Doctoral thesis, [S.l. : s.n.], 1999. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10324701.

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4

Whitaker, David Lee. "Two-dimensional Euler computations on a triangular mesh using an upwind, finite-volume scheme." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80278.

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A new numerical procedure has been developed for the finite-volume solution of the Euler equations on unstructured, triangular meshes using a flux-difference split, upwind method. The procedure uses a dual mesh system to implement the finite-volume scheme using conserved variables stored at the vertices of the triangles. The vertices of the triangles are located approximately in the center of the dual mesh cells and conservation is enforced about each dual mesh finite-volume. Techniques are developed for implementing Roe's approximate Riemann solver on unstructured grids. Higher order accuracy
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5

Paudel, Gaurab. "Hexahedral Mesh Refinement Using an Error Sizing Function." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3447.

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The ability to effectively adapt a mesh is a very important feature of high fidelity finite element modeling. In a finite element analysis, a relatively high node density is desired in areas of the model where there are high error estimates from an initial analysis. Providing a higher node density in such areas improves the accuracy of the model and reduces the computational time compared to having a high node density over the entire model. Node densities can be determined for any model using the sizing functions based on the geometry of the model or the error estimates from the finite element
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6

Le, Melinaire Pascal. "Modélisation de relations géométriques par la méthode DSI : application à la géologie." Vandoeuvre-les-Nancy, INPL, 1992. http://docnum.univ-lorraine.fr/public/INPL_T_1992_LE_MELINAIRE_P.pdf.

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L'ensemble des systèmes de CAO classiques supposent que les surfaces admettent une représentation paramétrique B(u,v) et sont interpolées par des fonctions du type Bezier, B-spline ou NURBS. Ces méthodes généralement appliquées dans l'industrie automobile et mécanique, ne permettent pas de traiter correctement des surfaces géologiques complexes ou de tenir compte interactivement de changements topologiques. Dans le cadre du projet GOCAD, J. L. Mallet propose une approche totalement différente, basée sur un nouveau principe d'interpolation en trois dimensions, appelé DSI (Discrete Smooth Interp
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7

Kunert, Gerd, and Serge Nicaise. "Zienkiewicz-Zhu error estimators on anisotropic tetrahedral and triangular finite element meshes." Universitätsbibliothek Chemnitz, 2001. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200100599.

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We consider a posteriori error estimators that can be applied to anisotropic tetrahedral finite element meshes, i.e. meshes where the aspect ratio of the elements can be arbitrarily large. Two kinds of Zienkiewicz-Zhu (ZZ) type error estimators are derived which are both based on some recovered gradient. Two different, rigorous analytical approaches yield the equivalence of both ZZ error estimators to a known residual error estimator. Thus reliability and efficiency of the ZZ error estimation is obtained. Particular attention is paid to the requirements on the anisotropic mesh. The analysis is
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8

Guo, Ruchi. "A Linear Immersed Finite Element Space Defined by Actual Interface Curve on Triangular Meshes." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/79946.

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In this thesis, we develop the a new immersed finite element(IFE) space formed by piecewise linear polynomials defined on sub-elements cut by the actual interface curve for solving elliptic interface problems on interface independent meshes. A group of geometric identities and estimates on interface elements are derived. Based on these geometric identities and estimates, we establish a multi-point Taylor expansion of the true solutions and show the estimates for the second order terms in the expansion. Then, we construct the local IFE spaces by imposing the weak jump conditions and nodal value
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9

Oliveira, Douglas Cedrim. "Simplificação de malhas triangulares baseada no diagrama de Voronoi intrínseco." Universidade Federal de Alagoas, 2011. http://repositorio.ufal.br/handle/riufal/1047.

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In this dissertation, we study the triangular mesh simplification process, describing its main characteristics. We discuss an adaptation for triangular meshes of a mesh simplification process based on Voronoi coverage proposed by Peixoto [2002]. Moreover, we use Fast Marching Method as a distance function over the mesh and some different strategies for simplified mesh vertices selection, like curvature based selection. The simplification process is done by constructing an intrinsic Voronoi diagram over the original mesh. We discuss some necessary conditions to obtain a mesh, as Voronoi dual, w
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10

Oliveira, Suzana Matos FranÃa de. "SimulaÃÃo de malha triangular: um estudo sobre a adaptatividade da malha." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9839.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>A animaÃÃo de tecido vem sendo estudada abundantemente nas Ãltimas dÃcadas por haver demanda na indÃstria do entretenimento bem como no comÃrcio eletrÃnico de roupas. Esse tipo de animaÃÃo, na maioria das vezes, Ã feita com base em simulaÃÃo fÃsica, havendo muito gasto computacional. Esse trabalho tenta usufruir de vÃrios modelos para diminuir esse gasto. Ã feito uma modelagem do tecido com uma malha triangular e usa-se um modelo massa-mola-amortecedor para simular as forÃas entre as partÃculas, que sÃo os vÃrtices dessa malha. Dep
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11

Schneider, Rene. "With a new refinement paradigm towards anisotropic adaptive FEM on triangular meshes." Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-125294.

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Adaptive anisotropic refinement of finite element meshes allows to reduce the computational effort required to achieve a specified accuracy of the solution of a PDE problem. We present a new approach to adaptive refinement and demonstrate that this allows to construct algorithms which generate very flexible and efficient anisotropically refined meshes, even improving the convergence order compared to adaptive isotropic refinement if the problem permits.
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12

Kunert, G. "Ein Residuenfehlerschätzer für anisotrope Tetraedernetze und Dreiecksnetze in der Finite-Elemente-Methode." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199800691.

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Some boundary value problems yield anisotropic solutions, e.g. solutions with boundary layers. If such problems are to be solved with the finite element method (FEM), anisotropically refined meshes can be advantageous. In order to construct these meshes or to control the error one aims at reliable error estimators. For isotropic meshes such estimators are known but they fail when applied to anisotropic meshes. Rectangular (or cuboidal) anisotropic meshes were already investigated. In this paper an error estimator is presented for tetrahedral or triangular meshes which offer a much greater geom
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13

Akdag, Osman. "Incompressible Flow Simulations Using Least Squares Spectral Element Method On Adaptively Refined Triangular Grids." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614944/index.pdf.

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The main purpose of this study is to develop a flow solver that employs triangular grids to solve two-dimensional, viscous, laminar, steady, incompressible flows. The flow solver is based on Least Squares Spectral Element Method (LSSEM). It has p-type adaptive mesh refinement/coarsening capability and supports p-type nonconforming element interfaces. To validate the developed flow solver several benchmark problems are studied and successful results are obtained. The performances of two different triangular nodal distributions, namely Lobatto distribution and Fekete distribution, are compared i
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14

Oliveira, Suzana Matos França de. "Simulação de malha triangular: um estudo sobre a adaptatividade da malha." reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/18649.

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OLIVEIRA, Suzana Matos França de. Simulação de malha triangular: um estudo sobre a adaptatividade da malha. 2013. 73 f. Dissertação (Mestrado em ciência da computação)- Universidade Federal do Ceará, Fortaleza-CE, 2013.<br>Submitted by Elineudson Ribeiro (elineudsonr@gmail.com) on 2016-07-12T17:36:10Z No. of bitstreams: 1 2013_dis_smfoliveira.pdf: 12369786 bytes, checksum: f3aac3380bd894f258de70c6024bf91f (MD5)<br>Approved for entry into archive by Rocilda Sales (rocilda@ufc.br) on 2016-07-22T12:31:55Z (GMT) No. of bitstreams: 1 2013_dis_smfoliveira.pdf: 12369786 bytes, checksum: f3aac3380bd89
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15

Moroney, Timothy John. "An investigation of a finite volume method incorporating radial basis functions for simulating nonlinear transport." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16303/1/Timothy_Moroney_Thesis.pdf.

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The objective of this PhD research programme is to investigate the effectiveness of a finite volume method incorporating radial basis functions for simulating nonlinear transport processes. The finite volume method is the favoured numerical technique for solving the advection-diffusion equations that arise in transport simulation. The method transforms the original problem into a system of nonlinear, algebraic equations through the process of discretisation. The accuracy of this discretisation determines to a large extent the accuracy of the final solution. A new method of discretisatio
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16

Moroney, Timothy John. "An investigation of a finite volume method incorporating radial basis functions for simulating nonlinear transport." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16303/.

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The objective of this PhD research programme is to investigate the effectiveness of a finite volume method incorporating radial basis functions for simulating nonlinear transport processes. The finite volume method is the favoured numerical technique for solving the advection-diffusion equations that arise in transport simulation. The method transforms the original problem into a system of nonlinear, algebraic equations through the process of discretisation. The accuracy of this discretisation determines to a large extent the accuracy of the final solution. A new method of discretisation is
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Bailey, Clare L. "Mathematical modelling of shallow water flows with application to Moreton Bay, Brisbane." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6335.

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A finite volume, shock-capturing scheme is used to solve the shallow water equations on unstructured triangular meshes. The conditions are characterised by: slow flow velocities (up to 1m/s), long time scale (around 10 days), and large domains (50-100km across). Systematic verification is carried out by comparing numerical with analytical results, and by comparing parameter variation in the numerical scheme with perturbation analysis, and good agreement is found. It is the first time a shock-capturing scheme has been applied to slow flows in Moreton Bay. The scheme is used to simulate transpor
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18

Groh, U. "FEM auf irregulären hierarchischen Dreiecksnetzen." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199801330.

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From the viewpoint of the adaptive solution of partial differential equations a finit e element method on hierarchical triangular meshes is developed permitting hanging nodes arising from nonuniform hierarchical refinement. Construction, extension and restriction of the nonuniform hierarchical basis and the accompanying mesh are described by graphs. The corresponding FE basis is generated by hierarchical transformation. The characteristic feature of the generalizable concept is the combination of the conforming hierarchical basis for easily defining and changing the FE space with an accompany
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19

Yanamadala, Janakinadh. "Development of the VHP-Female Full-Body Computational Model and Its Applications for Biomedical Electromagnetic Modeling." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-theses/142.

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Computational modeling offers better insight into a wide range of bioelectrical and biomechanical problems with improved tools for the design of medical devices and the diagnosis of pathologies. Electromagnetic modeling at low and high frequencies is particularly necessary. Modeling electromagnetic, structural, thermal, and acoustic response of the human body to different internal and external stimuli is limited by the availability of numerically efficient computational human models. This study describes the development to date of a computational full-body human model - Visible Human Project
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20

Vidal, Vincent. "Développement de modèles graphiques probabilistes pour analyser et remailler les maillages triangulaires 2-variétés." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00708530.

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Ce travail de thèse concerne l'analyse structurelle des maillages triangulaires surfaciques, ainsi que leur traitement en vue de l'amélioration de leur qualité (remaillage) ou de leur simplification. Dans la littérature, le repositionnement des sommets d'un maillage est soit traité de manière locale, soit de manière globale mais sans un contrôle local de l'erreur géométrique introduite, i.e. les solutions actuelles ne sont pas globales ou introduisent de l'erreur géométrique non-contrôlée. Les techniques d'approximation de maillage les plus prometteuses se basent sur une décomposition en primi
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21

Grosman, Sergey. "Adaptivity in anisotropic finite element calculations." Doctoral thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600815.

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When the finite element method is used to solve boundary value problems, the corresponding finite element mesh is appropriate if it is reflects the behavior of the true solution. A posteriori error estimators are suited to construct adequate meshes. They are useful to measure the quality of an approximate solution and to design adaptive solution algorithms. Singularly perturbed problems yield in general solutions with anisotropic features, e.g. strong boundary or interior layers. For such problems it is useful to use anisotropic meshes in order to reach maximal order of convergence. Moreover,
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22

Khan, Fayaz A. "Two-dimensional shock capturing numerical simulation of shallow water flow applied to dam break analysis." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7750.

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With the advances in the computing world, computational fluid dynamics (CFD) is becoming more and more critical tool in the field of fluid dynamics. In the past few decades, a huge number of CFD models have been developed with ever improved performance. In this research a robust CFD model, called Riemann2D, is extended to model flow over a mobile bed and applied to a full scale dam break problem. Riemann2D, an object oriented hyperbolic solver that solves shallow water equations with an unstructured triangular mesh and using high resolution shock capturing methods, provides a generic framework
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Trisiripisal, Phichet. "Image Approximation using Triangulation." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/33337.

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An image is a set of quantized intensity values that are sampled at a finite set of sample points on a two-dimensional plane. Images are crucial to many application areas, such as computer graphics and pattern recognition, because they discretely represent the information that the human eyes interpret. This thesis considers the use of triangular meshes for approximating intensity images. With the help of the wavelet-based analysis, triangular meshes can be efficiently constructed to approximate the image data. In this thesis, this study will focus on local image enhancement and mesh simplifica
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Patyk, Sylwia. "Forces analysis rolling burnishing rough surfaces with triangular outlines asperity : PhD thesis summary." Rozprawa doktorska, [s.n.], 2015. http://dlibra.tu.koszalin.pl/Content/1059.

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Hromádka, David. "Knihovna pro práci s tetraedrální sítí." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2013. http://www.nusl.cz/ntk/nusl-236406.

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Many architecure, medical and engineering applications need a spacial support for various numerical computations (i.e. FEM simulations). Tetrahedral meshes are one of perspective spatial representations for them. In this thesis, several possibilities of effective tetrahedral mesh representation for its generating and processing are described. A computer library for the mesh processing is proposed which can be characterized by memory  efficient imposition of the mesh while preserving the ability to apply topological and geometric algorithms effectively. The library is implemented in C++ languag
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Pampanelli, Patrícia Cordeiro Pereira. "Geração de malhas trivalentes através do mapeamento de modelos triangulares no espaço rombóide." Universidade Federal de Juiz de Fora (UFJF), 2011. https://repositorio.ufjf.br/jspui/handle/ufjf/3519.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-03-02T17:15:29Z No. of bitstreams: 1 patriciacordeiropereirapampanelli.pdf: 10123132 bytes, checksum: 7b722bf4cc93a2714a196242334a5f40 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-03-06T19:57:33Z (GMT) No. of bitstreams: 1 patriciacordeiropereirapampanelli.pdf: 10123132 bytes, checksum: 7b722bf4cc93a2714a196242334a5f40 (MD5)<br>Made available in DSpace on 2017-03-06T19:57:33Z (GMT). No. of bitstreams: 1 patriciacordeiropereirapampanelli.pdf: 10123132 bytes, checksum: 7b722bf4cc9
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Restrepo, Specht Juan Andrés. "Modelisation d'objets 3D par construction incrémentale d'un maillage triangulaire, dans un contexte robotique." Toulouse 3, 2005. http://www.theses.fr/2005TOU30015.

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Pour modéliser un objet 3D, plusieurs images doivent être acquises depuis différents points de vue. Les problèmes sont: recalage les vues. Fusion dans une seule représentation. Optimisation par un choix des points de vue. Les images 3D sont recalées par un algorithme appelé “ICP”. Afin de réduire le temps de calcul et améliorer la précision, des variantes de la méthode sont évaluées: points de contrôle, recalage des images ou entre image et modèle courant. Les vues recalées sont fusionnées dans une représentation de maillage triangulaire, qui est construit par une version adaptée de l'algorith
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Chen, Sin-Jhou, and 陳信州. "Interactive Decal Texturing on Triangular Mesh." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/374wha.

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碩士<br>大同大學<br>資訊工程學系(所)<br>95<br>The development technology of 3D models is very mature in recent years. It is a quite important part in computer graphics. More beautiful 3D models can attract more people's sight. Although many tools have been provided to make 3D models, it is still inconvenient to make the textures mapping onto a 3D model. A method is described for texturing surfaces using decals, images placed on the surface using local parameterizations. Decal parameterizations are generated with a novel discrete approximation to the geodesic vectors which requires only a single additional
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陳昇國. "Centroid estimation and subdivision for triangular mesh." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/42569635628915799228.

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博士<br>國立中正大學<br>數學研究所<br>91<br>In this thesis, we present the \omega -weight normal vector and curvature forms on triangluar meshes. And show the result of two different kinds of weight, area-weight and centroid-weight. Then, we also describe subdivision methods, these methods are depend on their neighbors and normal vectors. Moreover, these subdivision methods have an important property: they can keep the normal vectors at the original triangular mesh and these subdivision methods are affine invariant.
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CHIEH, CHAN HUANG, and 詹皇傑. "Distributed Hierarchical Triangular Mesh Index Base on Hadoop." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/v78mww.

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碩士<br>國立中央大學<br>資訊工程學系<br>104<br>Recently, research or applications in earth science, geography, astronomy, those need analyzing and processing spatial objects which position is usually recorded by right ascension (ra) and declination (dec) on sphere. In order to store and manage those objects efficiently, we need to design a well sphere spatial index system. With the progress of technology and long-term accumulation of data, there are more and more data need to analyze in each field, this result cause that hardware can’t afford data in traditional single machine application environment. T
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Lin, Ping-Sheng, and 林秉聖. "Research of Triangular mesh process in reverse engineering." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/38265944972785565529.

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碩士<br>國立中央大學<br>機械工程研究所<br>91<br>ABSTRACT Computer aid design (CAD) and Computer aid Manufacture (CAM) are extensively used in industry. At first we should use 3D scanning (the measurement and modeling of shape and other visual properties) to modeling a physical model into triangular model in reverse engineering, then construct a surface model from triangular model, and this thesis has a goal to discuss several methods to deal with triangular mesh, and accelerates step in turning triangular model to surface model. Therefore designing a data structure at first to process triangular mesh easil
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Yang, Wei-Lun, and 楊偉倫. "Error Diagnosis and Feature Line Extraction of Triangular Mesh." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/18235376389293021572.

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碩士<br>臺灣大學<br>機械工程學研究所<br>95<br>With the advance of 3D measurement system, the application of reversed engineering pays gradually much attention. Reconstruction of surface model is one of the most important issues in reversed engineering especially on the improvement of mesh file. The procedure of reconstruct surface will affect the efficiency and quality of surface. So the errors diagnosis, hole fill and feature lines extraction are the great benefit to later mesh processing. STL file is more popular input file format of CAD and reversed engineering and regards as the researching target. Thi
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Wang, Chao-wei, and 王詔緯. "Filling Holes in Triangular Mesh for Digital Model Applications." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/11916292994005473200.

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碩士<br>國立中正大學<br>機械工程所<br>98<br>This paper proposes an efficient and adaptive hole-filling algorithm. The main structure can be categorized into six steps. First, this paper deletes self-intersection triangles by collision detection method and noisy triangles are detected and removed according to model size. Second, OpenMesh structure is used to detect hole boundary efficiently and solve the problem of cutting hole whose shape is “8” type. Third, the initial mesh is reconstructed by referring to advancing front mesh algorithm [6]. Then, the weightings of interpolated vertices are defined to ref
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Chiang, Chang-Long, and 江政隆. "Triangular Mesh Reconstruction for Laser Scanning Data of Teeth Repair." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/99869234730507920660.

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Chen, Pu, and 陳璞. "Unstructured Triangular Mesh Generation and Application to Traffic Flow Simulation." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/70335728032973161879.

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碩士<br>國立交通大學<br>運輸科技與管理學系<br>91<br>The quality of mesh is an essential element in modern numerical computation. It is known that a well-designed and -generated mesh structure can increase the accuracy of solution and reduce the time cost of simulation process in various science and engineering problems. The mesh structure and refinement algorithm for multidimensional complicated geometries play important roles in developing any cost effective mesh generation schemes. In this work three most popular mesh structures, structured mesh, 1-irregular mesh, and triangular mesh have been investigated a
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Chang, Yao Jen, and 張耀仁. "A Triangular-Mesh-Based Approach to Fault-Tolerant Distributed Mutual Exclusion." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/49833907010156675305.

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碩士<br>國立中山大學<br>應用數學研究所<br>83<br>In the problem of mutual exclusion, concurrent access to a shared resource using a structural program abstraction called a Critical Section (CS) must be synchronized such that at any time only one process can enter the CS. In a distributed system, due to the lack of both in shared memory and a global clock, and due to unpredictable message delay, the design of a distributed mutual exclusion protocol that is free from deadlock and starvation, is much more com
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Lian-YunLi and 李璉昀. "Triangular mesh for hexagonal nanostructures using Finite-Difference Time-Domain method." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9knaf5.

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Huang, Chia-Kang, and 黃家慷. "On the Development of Boundary Representation and Mesh Segmentation for Triangular Meshes." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/hy4zxe.

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碩士<br>國立中央大學<br>機械工程研究所<br>96<br>Reverse engineering is a technique to reconstruct the CAD model from the three-dimensional measurement points of a physical object. There are many steps for building a CAD model. One of the important steps is segmentation. The goal for segmentation is to separate meshes into smaller regions, where each can be approximated by a single surface. In this study, a triangle mesh segmentation procedure which can eliminate the effect of noise on the meshes is proposed. Three key algorithmic components are presented in more detail: curvature calculation, feature extrac
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Tzeng, Kai-Wei, and 曾凱威. "Application of Triangular Mesh Segmentation and Surface Reconstruction for Automobile Sheet Metal." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/32564078413284185666.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>96<br>Surface Reconstruction is one of the most time-consuming process during the development process for automobile sheet metal in reverse engineering. In order to decrease the time cost of development process, surface reconstruction from point sets should be proceeded automatically. Taking the residual error of resulting surface into account, surface fitting from the whole point sets will be inadequate to satisfy the required accuracy; consequently, as a preprocessor, mesh segmentation should be proceeded before surface fitting to improve the residual error of res
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Lee, Pai-Feng, and 李白峰. "Reconstruct Object Triangular Mesh by Using Spatial Points Cluster characteristics on Surface." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/7xt9bh.

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碩士<br>中原大學<br>資訊工程研究所<br>91<br>Recently, the fast progress of computer technology and cost down of prices progressively, “Virtual Reality” becomes so popular. Many scenes of objects are displayed by 3D’s form, there are almost real effect, such as 3D (three dimension) architecture 、the introduction and trial of merchandise on line. Many object models are necessary to display a scene. Unfortunately, only a little objects of the real world have built its digital form. Therefore users must create digital objects by themselves. To create a digital object, user can use surface reconstruction. It be
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Lin, Yu-Yu, and 林友瑜. "Processing of Triangular Mesh Patch and B-spline Surface Reconstruction for Automobile Sheet Metals." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/72501765694874038054.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>98<br>Nowadays in the reverse engineering of automobile sheet metals, computer-aided design(CAD) and computer-aided manufacture(CAM) related technology and software are widely applied. The CAD model manufacturing of sheet metals, a part of reverse engineering, must reconstruct the surface through triangular mesh and adjust the continuity between the surfaces. This process is time-consuming, thus decreasing the working time by using semi-automatic process will benefits the industry. To fulfill accuracy and smoothness, mesh must be divided into different patches
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Chen, Hung-Jen, and 陳鴻仁. "Hybrid-Elements FEM Based Complex Mode Solver for Optical Waveguides with Triangular-Mesh Generator." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/40434809278033043746.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>91<br>Due to its accuracy and versatility, the finite element method (FEM) based on curvilinear hybrid nodal/edge elements is adopted in this thesis for studying optical waveguide problems. Although the FEM has been extremely successful in solving electromagnetic problems, an automatic mesh generator is highly desired for dealing with the more complicated optical devices. An FEM mesh generation system, named EasyMesh, is employed for the division of the computational window. In addition, for solving the leaky-mode problems, such as the investigation of propagation l
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CHANG, YI-HUNG, and 張亦宏. "The Design and Implementation of ASIC for Triangular Mesh Algorithm Applied to Collision Detection." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4qye6z.

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碩士<br>國立中正大學<br>電機工程研究所<br>107<br>Collision detection is the basis of computer graphics and important applications. Robots or machine tools in animation, image reconstruction, video games, and virtual reality, or in the mechanical field, can avoid accidents by Computer graphics collision detection. Before doing collision detection in computer graphics, the object to be measured is three-dimensionally modeled, and the three-dimensional modeling is a description of the real object in the computer, often composed of a triangular mesh. Therefore, in order to perform collision detection on two obje
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Wu, Zong-Yu, and 吳宗諭. "The study of Computer Aided Inspection about combining STL Triangular Mesh with tolerance of DXF information." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/rs3cns.

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碩士<br>國立中央大學<br>機械工程研究所<br>94<br>Quality inspection has been an indispensable part in the production process all the time. The technique of inspection has to be improved in order to keep up with the development of manufacturing. In spite of many kinds of inspection that should be implemented in a product, the dimension inspection of the product is still the most important. For this reason, the objective of this study combines the CAD system and the DXF blueprint to simplify the steps of automatic inspection by using CAD system. The main focus of this study is to develop the basic principle an
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Lee, Meng-Chen, and 李孟貞. "Application of Triangular Mesh Morphing and Surface Reconstruction for Springback Compensation of Automobile Sheet Metal Die Face." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/44377889438015809816.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>100<br>Owing to the rising attention of environment and energy issues, weight reduction of automobile has become the top challenge for the automotive manufacturers. It can effectively reduce weight by replacing conventional steels with advanced high strength steels (AHSS) or light metal such as aluminum and magnesium alloys. Using these materials can reach the requirements of collision regulations; however, it has encountered a serious springback problem in sheet metal forming process. During the conventional die compensation process, it is not only increasing the t
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Labsik, Ulf [Verfasser]. "Multiresolution mesh processing for triangular and tetrahedral meshes = Multiresolution-Verarbeitung von Dreiecks- und Tetraedernetzen / vorgelegt von Ulf Labsik." 2004. http://d-nb.info/97181404X/34.

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Mokriš, Dominik. "Generování a optimalizace meshů." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-304490.

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This thesis is devoted to the problem of finding a suitable geometrical de- scription of the domain for the Finite Element Method (FEM). We present the most important methods used in generation and improvement of unstructured triangular meshes (grids) for two dimensional FEM. Possible measures of mesh quality are discussed with respect to their usage in linear Lagrange FEM. The relationship between mesh geometry (especially angles of particular triangles), discretization error and stiffness matrix condition number is examined. Two methods of mesh improvement, based on Centroidal Voronoi Tessel
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