【作者】 罗里荣；

【导师】 李宇鹏；

【作者基本信息】 燕山大学 ， 机械制造及其自动化， 2004， 硕士

【摘要】 缩短产品的开发周期是赢得市场竞争优势的前提和保证。快速原型制造RPM(Rapid Prototyping Manufacture)技术因其制造速度敏捷和技术的高度柔性而受到人们的青睐。对于一些复杂的样件，通用造型软件很难或者根本无法直接重建其CAD模型。反求工程RE(Reverse Engineering)技术的发展给RPM技术提供了数据来源，两者的集成形成了一个集设计、制造与检测的闭环反馈系统，经过这样的设计反复，可使产品更臻完善。目前RE和RPM技术虽能匹配，但不理想，其原因是现有RE中的一些技术不能满足RPM的要求，因此要对其进行改进。本文主要工作有：用径向基神经网络对测量数据进行修补，并运用Matlab语言编程对数据修补进行仿真试验；空间三角网格直接划分是反求工程领域里研究的瓶颈问题，本文研究了一种3D空间网格直接划分算法，解决了以往二维划分方法需要分片投影的不足，算法由边界环扩展、分裂到最终边界环的封闭三个基本操作元素组成，对任何曲面类型的三角划分可以看作这些操作的有机组合，因而算法具有很强的适应性和高效性；网格优化是要解决的另一个关键问题，文中提出了网格综合优化的新概念，特别强调了网格空间形状优化，使三角网格在精度范围内对原始曲面进行逼近；本文还研究了基于三角网格的光滑曲面造型方法，阐述了三角Bezier曲面重构算法在反求工程领域中的应用前景；基于面向对象的编程思想，在VC++6.0集成开发环境下，结合OpenGL图形工具包进行反求建模系统的开发，设计出界面友好的应用软件。本文关于面向快速原型制造的反求工程关键技术的研究是一次尝试和探索，对于提高我国的反求技术水平和RE/RPM集成水准具有着重要的理论和实用价值。更多还原

【Abstract】 To shorten the period of product development is a premise to win the market competitive advantage with guarantee. The rapid prototyping manufacture (RPM) technique is favor by people because of its nimble speed and high flexibility. For some complex samples，it is very difficult or impossible to use some general shape software to reconstruct their CAD models directly. The development of reverse engineering (RE) techniques provides RPM with the data source. The effective integration of RE and RPM forms a close feedback system composed by the design, manufacturing and examining. By design like this again and again, products will be more and more perfect in the end.At present, the technology of RE doesn’t match RPM ideally because some techniques of RE cannot meet the need of RPM. It is necessary to improve the key techniques of RE. The main tasks in this paper are as follows: The rational function neural network is used to repair the measure data, and then the Matlab language is applied to programme to simulate experiment. The triangulation in space is a bottleneck problem. An effective 3D triangulation algorithm for scattered points is studied. It solves the problem that data points must be partitioned for multi-projection realized by traditional 2D triangulation methods. Three basic processing operations of 3D triangulation algorithm composed by boundary loop extending, splitting and closing finally are summarized. The triangulation for any type of surface is considered as the combination of these operations, which makes the algorithm have great adaptability and high efficiency. Triangular mesh optimization is also a key problem. A new concept about synthetical optimization of mesh is put forward. It emphasizes specially the optimization of the mesh shape in the space, making triangle mesh approach the primitive surface within the scope of accuracy. The method of smooth surface reconstructed based on the triangle mesh is studied and the application foreground of cubic Bezier spline surface in the field of RE is expatiated. Based on the thoughts of object-oriented programming, the mold-reconstruction system is developed in the integrated<WP=6>development environment of VC++6.0 with the OpenGL saddlebag, and the friendly software interface is designed.The study on key techniques of shape reverse seeking oriented rapid prototyping manufacturing presented in this dissertation are tentative and exploring, which is significant in theory and practice for improving the reverse technique and in our country.更多还原