逆向重建中B样条曲面过渡/微调精简方法

B-Spline Surface Transition/Fine-Tuning Reduction Method in Reverse Reconstruction

为提高逆向工程中点云数据精简与重构的精度和效率,改进B样条曲面拟合在曲率精简和曲面重构中的应用问题.对逆向工程中的3维扫描技术、3维设计、点云数据的精简及模型重构做了深入细致的应用研究.提出一种基于B样条曲面过渡/微调精简算法,将该研究应用于叶轮的逆向制造中,通过3维扫描获得曲面重构点云数据,将点云数据合理拼合封装与精简,进行曲面重建和3维再设计,同时分析产品的光顺性和精度,并利用快速成型机打印出产品模型样件.研究结果表明该方法既高效提高了曲面建模效率,又改善了逆向建模精度.

In order to improve the accuracy and efficiency of the reduction and reconstruction of point cloud data in reverse engineering,the application of B spline surface fitting in curvature reduction and surface reconstruction was improved.The 3 Dscanning technology,3 Ddesign,point cloud data simplification and model reconstruction in reverse engineering were applied and studied in depth and detail.A reduction algorithm based on B-spline surface transition/fine tuning was proposed.The research was applied to reverse manufacturing of impeller.Point cloud data can be reconstructed by 3 Dscanning,and the point cloud data can be encapsulated and simplified reasonably.Surface reconstruction and 3 D redesign were carried out,and the smoothness and precision of the product were analyzed at the same time.Finally,the product model sample was printed out by the rapid prototyping machine.The research results show that the proposed method not only improves the efficiency of surface modeling,but also improves the accuracy of inverse modeling.