0000000000319713

AUTHOR

Hassan Ugail

showing 4 related works from this author

Explicit polynomial solutions of fourth order linear elliptic Partial Differential Equations for boundary based smooth surface generation

2011

We present an explicit polynomial solution method for surface generation. In this case the surface in question is characterized by some boundary configuration whereby the resulting surface conforms to a fourth order linear elliptic Partial Differential Equation, the Euler–Lagrange equation of a quadratic functional defined by a norm. In particular, the paper deals with surfaces generated as explicit Bézier polynomial solutions for the chosen Partial Differential Equation. To present the explicit solution methodologies adopted here we divide the Partial Differential Equations into two groups namely the orthogonal and the non-orthogonal cases. In order to demonstrate our methodology we discus…

Mathematical analysisFirst-order partial differential equationExplicit and implicit methodsAerospace EngineeringPartial differential equationExplicit polynomial solutionExponential integratorComputer Graphics and Computer-Aided DesignParabolic partial differential equationSurface generationPDE surfaceLinear differential equationElliptic partial differential equationModeling and SimulationAutomotive EngineeringSymbol of a differential operatorMathematicsComputer Aided Geometric Design
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A general 4th-order PDE method to generate Bézier surfaces from the boundary

2006

In this paper we present a method for generating Bezier surfaces from the boundary information based on a general 4th-order PDE. This is a generalisation of our previous work on harmonic and biharmonic Bezier surfaces whereby we studied the Bezier solutions for Laplace and the standard biharmonic equation, respectively. Here we study the Bezier solutions of the Euler-Lagrange equation associated with the most general quadratic functional. We show that there is a large class of fourth-order operators for which Bezier solutions exist and hence we show that such operators can be utilised to generate Bezier surfaces from the boundary information. As part of this work we present a general method…

Surface (mathematics)Partial differential equationAerospace EngineeringBoundary (topology)Harmonic (mathematics)Bézier curveTopologyComputer Graphics and Computer-Aided DesignEuler–Lagrange equationPDE surfaceComputer Science::GraphicsModeling and SimulationAutomotive EngineeringBiharmonic equationApplied mathematicsMathematicsComputer Aided Geometric Design
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On harmonic and biharmonic Bézier surfaces

2004

We present a new method of surface generation from prescribed boundaries based on the elliptic partial differential operators. In particular, we focus on the study of the so-called harmonic and biharmonic Bezier surfaces. The main result we report here is that any biharmonic Bezier surface is fully determined by the boundary control points. We compare the new method, by way of practical examples, with some related methods such as surfaces generation using discretisation masks and functional minimisations.

Surface (mathematics)DiscretizationMathematical analysisAerospace EngineeringBoundary (topology)Harmonic (mathematics)Bézier curveBiharmonic Bézier surfaceTopologyComputer Graphics and Computer-Aided DesignPDE surfaceModeling and SimulationAutomotive EngineeringBiharmonic equationMathematicsComputer Aided Geometric Design
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A COMPARATIVE STUDY BETWEEN ´ BIHARMONIC BEZIER SURFACES AND BIHARMONIC EXTREMAL SURFACES

2009

AbstractGiven a prescribed boundary of a Bezier surface, we compare the Bezier surfaces generated by two different methods, i.e., the Bezier surface minimising the biharmonic functional and the unique Bezier surface solution of the biharmonic equation with prescribed boundary. Although often the two types of surfaces look visually the same, we show that they are indeed different. In this paper, we provide a theoretical argument showing why the two types of surfaces are not always the same.

Bézier surfaceComputer scienceHardware and ArchitectureMathematical analysisBiharmonic equationBoundary (topology)Bézier curveBiharmonic Bézier surfaceComputer Graphics and Computer-Aided DesignSoftwareComputer Science ApplicationsInternational Journal of Computers and Applications
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