点云反求造型设计——汽车覆盖件 二

机械设计制造及其自动化论文，论文编号:JX1272  论文字数:12212.页数:41

 摘  要
 逆向工程已成为联系新产品开发过程中各种先进技术的纽带，并成为消化、吸收先进技术，实现新产品快速开发的重要技术手段。汽车车身覆盖件都是由曲面构成，为了提高车型设计效率，国内外大多数厂家利用逆向工程加快车型开发。本文主要对点云汽车覆盖件进行逆向再设计，在这里用Imageware软件对给定的点云数据—汽车覆盖件进行点云数据预处理，点云分块、特征提取、截面线构造等操作获得必须的曲面重构信息，通过误差分析验证所做点云是否合格，最后把所生成的曲面输入到UG里面进行最后处理。
关键词：逆向工程    汽车覆盖件   点云   Imageware
 
Abstract
 reverse engineering has become the bond during the development process of  a new product,and also an advanced technology of Digesting and absorpting the advanced technolog and acheiving to have a rapid development of a new product. Auto Panels are constituted by the bend surface, in order to enhance the efficiency of vehicle design, the majority of manufacturers at home and abroad use of reverse engineering to speed up the development models. this thesis redesigns the Point Cloud for Automotive Panels,and using imageware to make a Pretreatment  of the Given Point cloud data -Point cloud data of the Auto cover,blocking  the Point cloud ,extracting Features and Constructing the Section Line  so as to obtain the Necessary information of Surface Reconstruction,and then Authenticate if the Point Cloud that already be made is Qualified or not by  Analysising the Error,at last,we Input the Generated surface into UG to have a final treatment.by designing the Reverse Modeling,I have a further Awareness to the Reverse industry,and it makes a good basis for my going to the society in the future.
Key words: Reverse engineering  automotive panel  point cloud   Imageware
 
目  录
 摘  要 I
 目  录 III
 第一章  绪论 1
 1.1 逆向工程的定义 1
 1.2 机电产品反求工程发展状况 2
 1.3汽车覆盖件逆向工程的特点及分类 2
1.3.1 汽车覆盖件逆向设计的特点 2
1.3.2汽车车身开发中逆向工程的分类 3
 1.4 逆向工程步骤 3
 1.5 逆向工程技术的应用领域 4
 第二章  反求建模理论与数据处理 5
 2.1点云 5
 2.2 NURBS曲线 5
 2.3 NURBS曲面 6
 2.4 数据的处理技术 7
 2.5软件的应用 8
 第三章 覆盖件反求造型 12
 3.1原始点云信息 12
 3.2顶部点云制作 13
 3.3简单平面的制作 16
 3.4平面的连接 19
 3.5有孔部位的制作 20
 3.6有凸起的三角制作 22
 3.7曲面的修剪 23
 3.8点云误差分析 27
 第四章 UG对曲面的加工 30
 第五章 总结 33
 致谢 34
 参考文献 35