自由曲面壳体几何造型的研究

On Geometry Modeling of Free Surfaces Shells

提出了一个自由曲面壳体实体造型的方法 .以船体为例 ,首先用准均匀 B样条方法构造出船舶壳体的内表面 ,通过计算曲面网格点法向等距离的对应点 ,生成偏置外表面 .以内外表面为边界面 ,构造复杂的船舶壳体 .介绍了曲线曲面数据小波压缩的原理 。

This paper presents a solid modeling methods of free sur face shell about a ship.First the inside surface of the ship shell is constructe d in Quasi-Uniform B-Spline,then the outside surface of the shell is cre ated by offset of the inside surface according to given distance at lattices of the surface in normal direction.The complex shell is constructed in inside and o utside surfaces as boundaries.The theory of the wavelet compress dates is introd uced,and common expression of a hyperpatch of the shell is given in the paper.