关键词: 汽车设计, 逆向工程, NURBS曲面, 曲面拟合, 点云

Abstract: A group of point cloud data is obtained by way of no contact CDD photogrammetry for reverse design of automobiles. The point cloud data are screened and classified with combining the three softwares together, i.e., Tritop, Atos and CATIA, thus making a characteristic curve net for the point cloud data by curve fitting technique. Then, a relevant curved surface is shaped using the fitting technique of NURBS curved surface. Comparing the curved surface thus shaped with the original point cloud data, the errors of the curved surface are analyzed and the result shows that only the error at recess edge increases a bit in a very small range. It conforms with the actual requirement for design. The way applying several softwares in combination to curved surface shaping is therefore proved available to reverse design of automobiles.