逆向工程三维点云数据后处理与模型的重建

逆向工程中获得的测量数据一般比较大,后处理部分的主要任务在于如何通过离散的三维点云数据来建立实用化的CAD模型,本文详细介绍了三维点云数据后处理流程以及CAD模型的重建过程。     

基于三坐标测量的鼠标自由曲面逆向反求

通过分析鼠标自由曲面逆向反求的技术，介绍了自由曲面数据的获取方法、CAD模型的重建技术，分析了数字模型与实物模型的误差，解决了反求技术中曲面重构和误差检测的难点技术。     

Neural network approach for modification and fitting of digitized data in reverse engineering

Reverse engineering in the manufacturing field is a process in which the digitized data are obtained from an existing object model or a part of it, and then the CAD model is reconstructed. This paper presents an RBF neural network approach to modify and fit the digitized data. The centers for the RBF are selected by using the orthogonal least squares learning algorithm. A mathematically known surface is used for generating a number of samples for training the networks. The trained networks then generated a number of new points which were compared with the calculating points from the equations. Moreover, a series of practice digitizing curves are used to test the approach. The results showed that this approach is effective in modifying and fitting digitized data and generating data points to reconstruct the surface model.     

Neural network approach for modification and fitting of digitized data in reverse engineering

INTRODUCTIONGrowingglobalcompetitionrequiresmanu facturerstodelivermorecompetitiveproductswithbetterqualityandlowerprices.Reducingtheproductdevelopmentperiodoftheproductisoneofthemostimportantandchallengingtasksfacedbythemanufacturingindustry .Thetradi tionalproductionpatternthatproductsarepro ducedfromthedrawingcannotsatisfytherequirementofmodernmanufacturingindustry .Thedesignofproductscontainingcomplexsculp turedsurfacessometimesstartswithaclaymodelorotherexistingparts.Theprocessofdeve…     

中山学院通信工程特色专业建设及初步实践

本文介绍了我院通信工程省特色专业建设的初步方案,首先分析了通信工程特色专业建设的必要性,然后对专业人才培养方案、课程体系、实践教学、师资队伍等建设方案进行了较为详细的设计和研究,最后给出了后续工作的重点。     

反求工程在快速成型技术中的应用

本文阐述了反求工程与正向工程的区别,反求工程的基本概念、常用数据采集方法,以及反求工程在快速成型技术中应用的意义。反求工程与快速成型技术的结合应用,可以快速响应市场需求的变化,为快速成型和快速模具技术的发展开辟新的领域。     

Research and development of fringe projection-based methods in 3D shape reconstruction

INTRODUCTION Geometric modelling is essential processing in computer-aided engineering (CAE) systems. Usually, the modelling of three-dimensional (3D) objects is embedded in a computer-aided design (CAD) system, which may take a huge amount of time to build entire models for CAE application. One option is the use of techniques of reverse engineering (RE) to build models from existing objects. Coordinate measuring machines (CMMs) are traditional RE tools used in the manufacturing i…     

逆向工程技术在汽车仪表盘零件开发中的应用

以汽车仪表盘为研究对象,通过激光扫描仪的非接触式测量获取零件曲面的点云数据,并利用Surfacer软件进行点云数据处理,且基于NURBS曲面重构理论进行零件曲面造型,最后利用Pro/Engineer软件完成汽车仪表盘的实体模型设计.与传统的设计方法相比,提高了工作效率,缩短了新产品的开发周期.