波波图：时尚北京生活手册 青少年教育.pdf

华中科技大学硕士学位论文
Abstract
Automobile panel is the kind of freeform ponents in automobile body,
and its surface generally has the purpose of decoration. So, it is designed to be
user-friendly, easy to make and repair, and to have nice appearance. In the design and
manufacture process of automobile panel, there are very strict quality requirements for
surface design in CAD system .However, the existing CAD systems have some imperfect
functions in surface treatment. Some geometry operations on surface in eeding
process may fail if there were some defects on the surface, such as gaps and mass data of
surface model. Therefore, a surface simplification module in a general CAD system
must be a good solution.
The characteristics of panel surface and defects on the surface was deeply studied in
this paper, and then the reasons and the corresponding processing method of surface defect
was summarized, and the theory of surface modeling was presented, After analyzing the
idea of surface treatment and surface simplifying modules of current CAD system, a new
algorithm of partial surface reconstruction was proposed, which defines region including
gaps first, and then get points cloud by discretization the region, and deal with them by an
interpolation algorithm. At last, the surface is reconstructed by interpolation of the points
cloud.
Based on the study of surface treatment method, a new surface simplifying algorithm,
including surface flaw examination and partial surface reconstruction, has been developed
on UG platform. It optimizes the old algorithm, and improves the data calculating speed.



Keywords: panel surface CAD of die surface examination
partial surface reconstruction
II
华中科技大学硕士学位论文
目录
摘要............................................................................................................... I
Abstract .................................................................................................