点云反求造型设计—汽车零部件

机械论文编号:JX723  论文字数:16567.页数:42   附CAD图

目  录
摘要 i
Abstract ii
目录 Ⅲ
第一章    绪论 1
1.1  逆向工程定义 1
1.2  逆向工程研究内容 1
1.3  逆向工程应用领域和发展趋势 3
1.4  逆向工程的工作流程及步骤 4
   Imageware简介及反球建模理论 6
2.1  Imageware简介 6
2.2  点云数据处理 8
2.3  数据的处理技术 9
2.4  三维模型重构技术 10
2.5  曲面的评价方法 11
   挡泥板反球造型 13
3.1 在Imageware中的数据处理 13
3.2  在UG中生成面 17
3.3  误差分析 24
   零部件反球造型 27
4.1 在Imageware中的数据处理 27
4.2  在UG中生成面 28
4.3  误差分析 34
第五章    总结 37
参考文献 38
致谢 39

摘     要
 逆向工程就是根据已经存在的产品模型，反向推出产品的设计数据（包括设计图纸或数字模型）的过程。
 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。大多数关于逆向工程的研究主要集中在实物的逆向重构上，即产品实物的CAD模型重构和最终产品的制造方面。逆向工程应用于车身产品尤其是汽车零部件产品的开发过程中，可以大大缩短开发周期，保证产品质量。逆向过程主要有三个步过程，一，点过程；二，曲线的创建过程；三，曲面的创建过程。而本章主要运用Imageware和UG两个软件完成逆向造型。首先在Imageware中根据点云的分布绘出所需要的外轮廓线及特征线，其次在UG中把这些外轮廓线及特征线连接起来，并使其封闭，再生成所需要的面，最后再进行误差分析。
 
关键词：逆向工程  曲面重构  点云数据处理
 
 Reverse Design of Automobile Panel Based on Point Cloud

 Abstract
 Reverse engineering is the product under the existing model, the reverse launch the product design data (including design drawings or digital model) process.
 Reverse engineering has become a link in new product development process of advanced technology ties, and a digest, absorb advanced technology, development of new products to achieve an important technical means. Most of the research on reverse engineering focused on physical reconstruction on the reverse, that kind of product CAD model reconstruction and the final product manufacturing.Reverse engineering for automotive body products, especially product development process, can greatly shorten the development cycle to ensure product quality. There are three major steps reverse the process of the process, one point process; 2, curve creation process; 3, surface creation process. The main application of this chapter, and UG Imageware two complete reverse modeling software.First Imageware point cloud distribution in the draw according to the needs and characteristics of the outer contour line, followed by those in the UG in the outline and characteristics of wire connected, and make it close, and then generate the required surface, and finally to error analysis.
 
 Keywords: Reverse Engineering  Curved face Reconstruction  Point cloud processing