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 27 for “"Bezier"”.
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A Bezier based higher order panel method for steady flow analysis of lifting and non-lifting bodies
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001.
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Robust evaluation of differential geometry properties using interval arithmetic techniques
… arithmetic. Iso-contouring of curvature of a Bezier surface patch. computation of curvature lines of a Bezier surface patch and computation of geodesics of a Bezier surface patch are computed by the Validated Numerical Ordinary Differential Equations (VNODE) solver which employs rounded …
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High-order adaptive methods for computing invariant manifolds of maps
… techniques from geometric modeling. He uses Bezier curves/triangles, fundamental objects in curve/surface design, to create adaptive methods. The methods are based on tolerance conditions derived from properties of Bezier curves/triangles. The author develops and tests the methods for an …
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Extensions to OpenGL for CAGD.
… patch created from degenerate rectangular Bezier patch with the existing functions provided by OpenGL, the triangular Bezier patches can be used in certain design situations and allow designers to achieve high-quality results that are less CPU intense and require less storage space. The …
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A multidisciplinary algorithm for the 3-D design optimization of transonic axial compressor blades
… in that it uses a simple, previously-developed Bezier geometry representation (BLADE-3D) that can be easily manipulated to achieve true 3-D changes in blade shape. The algorithm incorporates zero and first-order optimization techniques including sensitivity analyses and one-dimensional search …
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Localization and tracking of high-speed trains using compressed sensing based 5G localization algorithms
… with the map points joined using cubic Bezier curves. The algorithm achieves sub-meter accuracy on the straight track scenario using just one Remote-Radio-Head. For the map trajectory generated using cubic Bezier curves, an accuracy of 1.05~m is achieved with a 99\% availability using …
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Subdivision, and refinement of non-uniform rational B-spline curves and surfaces in 3-D
… spline formulations and a history of splines, Bezier's cubic spline, and cubic B- splines. This includes uniform rational B-splines and non-uniform rational B-splines, their construction, pros and cons of the different representations, and subdivision and deformation of curves and surfaces. A …
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A Geometry-Based Motion Planner for Direct Machining and Control
… planner is developed with the intent to process Bezier curves. The motion planning module includes a deterministic predictor-corrector-type curve interpolator, a dynamics limiting module, and a two-pass jerk-limited speed profiling algorithm. The methods are verified by machining an automotive …
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Segmentation of nerve bundles and ganglia in spine MRI using particle filters
… representation of tubular structures based on Bezier splines. We construct an appropriate dynamics to reflect the continuity and smoothness properties of real nerve bundles. Moreover, we introduce a robust image likelihood model that enables delineation of nerve bundles and ganglia from the …
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Intersection of B-spline surfaces by elimination method
… surface representations such as the B-spline and Bezier geometries are widely used among the aerospace, automobile, and shipbuilding industries. These surfaces have proven to be very advantageous for defining and combining primitive geometries to form complex models. However, the task of finding …
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Scattered surface data estimation and visualization
… i.e., extended piecewise Hardy's method and Bezier triangle method, are developed for scattered surface data and the biquadratic method is developed for regular data set. A new contour method which can generate arbitrarily smooth contour line is also presented. The new methods are compared …
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Design and testing of a UAV-based, through-rubble vital sign detection RADAR using metaheuristic topology optimization
… a new antenna parametrization based on Bezier curves is developed and evaluated against the established pixel-based parametrization.
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Contour Encoded Compression and Transmission
… contain a wide variety of shapes, fitting Bezier curves to connected component contours can provide better compression than current glyph library or other codebook compression methods. In addition to better compression, the CECAT system divides the image into layers and tiles that can be …
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A CFD framework for aeroelastic gust load calculations
… for this purpose and 3rd order accurate Bezier curves used to recover a smooth deformed wing. The various sub-components of the aeroelastic model were rigorously validated. Following this, the developed framework was applied to the CRM under gust load conditions.
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Neural Networks Satisfying Stone-weiestrass Theorem And Approximating
… spatial points by using B-Splines and NURBS or Bezier surfaces. Hoffman and Varady used Kohonen neural networks to construct appropriate grids. This thesis is concerned with two types of neural networks viz. those which satisfy the conditions of the Stone-Weierstrass theorem and Kohonen neural …
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Mesh adaptation through r-refinement using a truss network analogy
… followed by the construction of 3rd order bezier surface patches over boundary faces. To investigate the ability of the scheme, three numerical test cases were investigated. The first comprised an analytical case, with the aim of qualitatively assessing the ability to cluster vertices …
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Time-dependent adjoint-based optimization of photonic crystals and metamaterials using a stabilized finite element method
… design optimization, to ensure smooth surfaces, Bezier curves are employed to parametrically represent the shape. To reflect the design changes on the mesh, linear elasticity is used to adapt interior mesh points to boundary modifications. The cost function used in this design attempts to shift …
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Autonomous aggressive driving: theory & experiments
… level. New path planning algorithms using Bezier curves are proposed to generate everywhere 𝐶2 continuous curvature-constrained paths for highway real-time lane-switching. We demonstrate expert overtaking maneuver by implementing the proposed decision making, path planning and control …
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Computationally-efficient path planning algorithms in obstacle-rich environments based on visibility graph method
… Proportional-Derivative (PD) controller and Bezier curves have been implemented to ensure that the resulting paths are feasible. As a result of the proposed methods, computation time of conventional VG has been improved by 97 %. The implementation of PD controller may contribute to path …
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Intelligent support for knitwear design
… construction. Garment shapes are modelled using Bezier curves generated using design heuristics drawn from industrial practice, to create curves that look right to a designer and can be easily edited. The development of the garment shape models presented in this thesis involved the solution of …
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