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The Connection between Surface Patches and Its Application in Automotive Body Surface Design

Author: TianBo
Tutor: FangZuo
School: Hunan University
Course: Applied Computer Technology
Keywords: Computer Aided Geometric Design CLASS A surface Fairing Blending Surfaces
CLC: TP391.7
Type: Master's thesis
Year: 2008
Downloads: 271
Quote: 3
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Abstract


The body is the the the automobile major assembly extremely important part of the development of the new models first is the development of the new body, its development cycle, manufacturing costs account for about 50 percent of the vehicle. The body contour surface patches requirements smooth stitching smooth transition to its design, manufacturing process, a direct impact on the level of the car's sporty performance and economy, environmental performance, comply with the principle of smoothing. Surface mathematical methods and stitching algorithm the blending surface design accuracy and quality, less the amount of data and control of the high degree of freedom is an important criterion to measure the quality of the stitching algorithm. Proceed from the surfaces represented Bezier and NURBS This work contains the following elements: First, a more practical rectangular domain Bezier surfaces C ~ r parameter continuous stitching algorithm. Subsequently a the triangular domain Bezier surfaces G ~ 1 continuous stitching algorithm has less data, faster computing advantages. Higher body surface patches are discussed rational Bezier surfaces stitching algorithm, draw a curved piece to achieve the common boundary C ~ r consecutive sufficient condition. B-spline surfaces with good overall control performance is rational B-spline method, the paper then discusses the commonly used algorithms in the stitching of the B-spline surface, come to the public, cut as long as the two surfaces along a common cable plane or surface normal, can be deduced G ~ 1 continuity condition, G ~ 2 continuous promotion can reach, you can meet the standard of Class A surfaces. Non-uniform rational B-spline (NURBS) surface patches G ~ 2 continuous stitching algorithm, obtained it meets G ~ 2 continuous charge necessary condition. The text followed from a mathematical point of view summarizes the requirements of Class A surfaces, and pointed out that its own CAD / CAM tools software enhancements and is now in a constant process of improvement. Of Class A surfaces construction methods and surface classification principles and then introduce the proposed mathematical model of a new division of surfaces. Analysis of the energy method of evaluation of surface fairing, the the surface fairing analysis method based on Gaussian curvature and illumination-based method summarized. Finally, we discuss the main module of CATIA V5 3D-aided design tools, the general method of secondary development of CATIA platform, component-based approach and the macro-based analysis from the point of view of software development. CATIA V5 provides powerful free-form surface design features and a complete set of surface quality evaluation standard for car styling, interior surfaces generated are based on Class A surfaces standard, a number of attempts on how to apply these functional modules.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Machine-assisted technology
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