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 47 for “"NURBS"”.
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From micro-CT TO A NURBS-based interface-enriched generalized finite element method
… materials with complex microstructures using a NURBS-based Interface-enriched Generalized Finite Element Method (NIGFEM) developed in Prof. Geubelle’s group over the past few years. The NIGFEM relies on structured meshes that do not conform to the material interfaces, and uses NURBS (Non-Uniform …
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Design optimization of aerodynamic drag at the rear of generic passenger cars using nurbs representation
… cars. The Non-uniform rational B-spline (NURBS) curve was used to represent the rear body of a generic passenger car model (the Ahmed Body) and the NURBS parameters were employed for geometry parameterization. These geometry parameters were systematically modified using design of …
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Isogeometric Finite Element Code Development for Analysis of Composite Structures
… smoothness and variation diminishing property of Nurbs basis for stress analysis of composite and sandwich beams and plates. This research also computes stress concentration factor in a composite plate with a hole. Isogeometric nonlinear/linear finite element code is developed for static and …
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T-spline Merging
… Historically, these models have been made of NURBS surfaces. For various reasons it is problematic and often times mathematically impossible to combine several NURBS models into one continuous surface. The recent invention of a surface type called T-splines has made the combining of NURBS …
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Arbitrary Degree T-Splines
… is a freeform surface type similar to NURBS, that allows partial rows of control points. Up until now, T-Splines have only been formally defined for the degree three case. This paper extends the definition to support all odd, even, and mixed degree T-Spline surfaces, making T-Splines a …
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Shape Optimization of Annular Combustors with an Open Source Parallelized Thermoacoustic Helmholtz Solver
… propose a surface parametrization technique, NURBS, to study shape sensitivities of a 30kW laboratory-scale annular combustor (MICCA from EM2C). We parametrize the surfaces of the three-dimensional geometry with NURBS control points. We apply two different strategies, perpendicular boundary …
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Subdivision, and refinement of non-uniform rational B-spline curves and surfaces in 3-D
… of curves and surfaces. A 3-D application using NURBS technology was developed to demonstrate the deforming and rendering of objects created using the NURBS representation. The application provides the capability of visualizing what happens to a curve or surface patch when a knot or knot vector …
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Algorithms for three-dimensional free-form object matching
… of free-form object matching for the point vs. NURBS surface and the NURBS surface vs. NURBS surface cases, and its application to copyright protection. Two new methods are developed to solve a global and partial matching problem with no a priori information on correspondence or initial …
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Rational Cubic B-Spline Interpolation and Its Applications in Computer Aided Geometric Design
… that the weights and the control points provide, NURBS have recently become very popular tools for the design of curves and surfaces. If the weights are positive then the NURB will lie in the convex hull of its control points and will not possess singularities. Thus it is desirable to have …
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Isogeometric Analysis: Fundamentals and details of implementation. From first steps to two-dimensional non-linear problems
… complex geometries. IGA is based on the use of NURBS (non-uniform rational B-splines), mathematical descriptions of geometry which are the standard of representing geometry in computer aided design (CAD) modeling software. IGA therefore links the CAD world to the world of analysis. Traditional …
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B-Spline Boundary Element Method for Ships
… the B-Spline or Non Uniform Rational B-Spline (NURBS) representation of the body as an input. In order to solve for the unknown potential, the source surface, both for the body as well as the free surface, is represented by NURBS surfaces. The method does not require the body surface to be …
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Algorithms for Smooth and Deformable Surfaces in Three Dimensions
… meshing of other low degree surfaces, such as NURBS. The surfaces created by the software bring stability in finite element methods and visualization of molecular structures to scientists.
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Multiscale design of nonlinear materials using a shape optimization scheme based on an interface-enriched GFEM
… a classical homogenization scheme with a NURBS-based Interface-enriched Generalized Finite Element Method (NIGFEM) used to capture accurately and efficiently the displacement field in a heterogeneous material with a finite element discretization that does not conform to the material …
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Semantically-rich as-built 3D modeling of the built environment from point cloud data
… fits non-uniform b-spline curves and surfaces (NURBS) into the segmented point cloud subsets. This method also addresses several key manual steps within the state-of-the-art surface and NURBS fitting methods; and (3) a new method that reasons about the interconnectivity between NURBS surfaces …
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Blade geometry description using B-splines and general surfaces of revolution
… to work with B-spline curves (and in some cases NURBS curves) and produce a B-spline surface for the blade.</p>
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Equilibrium analysis of topological interlocking for structural assemblies
… a mapping strategy based on conformal mapping on NURBS surface to design freeform topological structural assemblies.
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On Aerothermal Optimization of Low-Pressure Steam Turbine Exhaust System
… in experiment. A Non-Uniform Rational B-spline (NURBS)-based optimization algorithm is also pre sented in this thesis. It generates surface meshes for NPSM and volume meshes for CFD solver based on control points given by optimizer. The conversion process is achieved by the evaluation of NURBS …
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Patient-Specific Computer Modeling of Blood Flow in Cerebral Arteries With Aneurysm and Stent
… The special techniques include using NURBS for the spatial representation of the surface over which the stent mesh is built, mesh generation techniques for both the finite- and zero-thickness representations of the stent, techniques for generating refined layers of mesh near the …
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