Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 98 for “"Quadrilateral"”.
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Automated Quadrilateral Coarsening by Ring Collapse
… developed in this thesis, the Automated Quadrilateral Coarsening by Ring Collapse (AQCRC) algorithm, provides a unique solution to allow conformal coarsening of both structured and unstructured quadrilateral finite element meshes. The algorithm is based on dual chord operations and dual …
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Quadrilateral Remeshing and Efficient Surface Parameterization
In the third part, we deal explicitly with the problem of surface parameterization. We present two complementary methods for automatically improving mesh parameterization, and demonstrate that they provide a desirable combination of efficiency and quality. First, we describe a new iterative method …
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Generation and Optimization of Quadrilateral and Hexahedral Meshes
Structured quadrilateral (quad) meshes are preferred in many engineering and medical applications due to their desired numerical properties. Despite the extensive research, automatic generation of quad- and hex- meshes with optimal structure remains a challenge. In-lieu-of generating a quad-mesh …
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A parabolic quadrilateral finite element for compressible and incompressible flows
A unified finite element solution scheme for incompressible and compressible flows would be most attractive in engineering practice. The objective in this thesis was to work toward this goal. A 9-node finite element for compressible and incompressible 2-D flow solutions is presented. In the …
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A comparison of numerical schemes on triangular and quadrilateral meshes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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On the generation of quadrilateral element meshes for general CAD surfaces
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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The development of an all quadrilateral boundary conforming grid generator for high order finite element methods
A grid generator is developed that produces all quadrilateral meshes. The scheme is automated to work for arbitrary choice of geometry. In addition, a Non-Uniform Rational B-Spline curve fitter is implemented to replicate the curvature of the geometries. The grid elements on the boundaries conform …
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Modified nodal integral method for Navier-Stokes equations incorporated with generic quadrilateral elements, and GPU-based parallel computing
… nodal integral method incorporated with generic quadrilateral elements is developed using a simple isoparametric geometry mapping. The mapping is used to transform: 1) the irregular four-node quadrilateral elements into square elements; 2) the original set of N-S equations into a set of …
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THE HOMOSEXUALITY DEBATE IN THE UNITED METHODIST CHURCH: Religious Ethics, the Wesleyan Quadrilateral, and The United Methodist Moral Landscape
… These two groups each utilize the Wesleyan Quadrilateral of Scripture, reason, tradition, and experience in similar yet distinct ways. In providing an analytical account of the mechanisms that guide United Methodist ethics, this study suggests the possibility that United Methodist teaching …
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Three Novel Algorithms for Triangle Mesh Processing: Progressive Delaunay Refinement Mesh Generation, Mls-Based Scattered Data Interpolation and Constrained Centroid Voronoi-Based Quadrangulation
… thesis is the conversion of triangle meshes to quadrilateral meshes. Although triangle meshes are preferred in most of applications, quadrilateral meshes show more stability in scientific computation. Because most of acquisition and mesh generation methods result in triangle meshes, converting …
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Development of Membrane, Plate and Flat Shell Elements in Java
The development of triangular and quadrilateral membrane, plate and shell elements in Java using the object oriented programming technique is presented. The membrane elements developed are the constant strain triangle (CST) element and the four node isoparametric quadrilateral membrane element. The …
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Development of Finite Element Modeling Mesh Generation and Analysis Software for Light Wood Frame Houses
… generated by the program may be triangular or quadrilateral. The triangular mesh can be generated over any arbitrary domain with multiple openings and line constraints. The program implements the advancing front method for triangulation as discussed by Lee and Hobbs. The difference is made by …
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A two-dimensional finite element mesh generator with automatic transitioning capability
… The program generates both triangular and quadrilateral two-dimensional elements and has automatic transitioning capability. The required input is the definition of the boundary of the structure, a measure of the relative size of the mesh at the key geometry points, and loading information. …
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Mathematical and computational aspects of the enhanced strain finite element method
… the equivalent parallelogram associated with a quadrilateral is introduced. The quadrilateral may be regarded as a perturbation of this parallelogram, which is most conveniently described by making use of properties of the isoparametric map which defines the quadrilateral. The equivalent …
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Numerical Study For Acoustic Micro-Imaging Of Three Dimensional Microelectronic Packages
… dispersion error and the exploration of quadrilateral infinite boundaries make up the first part of this thesis's contributions. The former focuses on establishing the convergence score of varying resolution densities in the time and spatial domain against a very high fidelity numerical …
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Schwarz's surface and the theory of minimal surfaces
… which is spanned by a regular tetrahedral skew quadrilateral. We use the Weierstrass-Enneper representation formulas to derive the analytic function $R(\omega)$ obtained by Schwarz and use a representation in terms of elliptic integrals to investigate the relation to the hyperbolic paraboloid.
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Towards optimal mixed finite elements for general shell structures
… shells and apply it to the family of quadrilateral MITC (Mixed-Interpolated Tensorial Components) shell elements proposed by Bathe, Dvorkin and Bucalem. The study demonstrates the superior performance of these elements. We also develop a new simple and effective triangular …
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The effects of prosthetic alignment on the stability of the knee in above knee amputees
… amputee. While the conventional socket is the quadrilateral, several problems have been reported with this type of socket. These include instability in the coronal plane, discomfort and restriction of the stump muscles causing limitations in the function of the prosthesis. In an attempt to …
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Finite Element Study of Plane Wave Acoustic Phenomena in Ducts
… that the higher order shape function eight-node quadrilateral element gave considerably better results than lower order shape function four-node quadrilateral element. The eight-node element converged much faster to the analytical solution than the four-node element. The average error, taking all …
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Illuminating triangles, quadrilaterals and convex polygons with vertex floodlights.
… vertex-floodlights suffice to illuminate every quadrilateral. Finally we provide a theorem for illuminating a cocircular convex n-gon P of n vertices with a set of k vertex-floodlights, (k ≤ n) whose total sum is pi.
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