Processing of Triangular Mesh Patch and B-spline Surface Reconstruction for Automobile Sheet Metals
Date Issued
2010
Date
2010
Author(s)
Lin, Yu-Yu
Abstract
Nowadays in the reverse engineering of automobile sheet metals, computer-aided design(CAD) and computer-aided manufacture(CAM) related technology and software are widely applied. The CAD model manufacturing of sheet metals, a part of reverse engineering, must reconstruct the surface through triangular mesh and adjust the continuity between the surfaces. This process is time-consuming, thus decreasing the working time by using semi-automatic process will benefits the industry.
To fulfill accuracy and smoothness, mesh must be divided into different patches and for each patch, the surface is reconstructed individually. The research of automatic dividing patches is well-developed; however, the errors between surfaces and mesh do not respond to the industry expectation. Therefore, the main purpose of this paper is to achieve the industry expectation by decreasing the errors. The input data of the proposed scheme is the patches generated by region growing. The scheme is composed of the following procedures: second division and consolidation by rules, thinning specific patches, and patch''s boundary rectification by differential properties of mesh vertex. By the processes mentioned above and the surface reconstruction proposed in this paper, an acceptable range is reached.
Subjects
reverse engineering
triangular mesh
thinning
boundary rectification
surface reconstruction
Type
thesis
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