三维环境下的自由曲面误差评定系统研究

Research on 3D error evaluating system for freeform surface

为了提升误差评定系统的效果,针对三坐标测量机的测量方式,基于OpenGL开发了三维环境下的自由曲面误差评定系统。根据三坐标测量机的特点进行了自由曲面测量点的三维球测头半径补偿,采用双三次B样条进行曲面的反求。针对点到自由曲面距离的计算问题,依据点与面片的匹配关系在叠代判断中加入参数越界的判断条件以提高效率。评定结果采用报表与三维显示相配合的方式,使结果更直观、方便。采用三维图形开发技术构建三维环境的误差评定系统,提升了逆向工程配套软件系统的灵活性与直观性,满足了用户需求。

Based on OpenGL technology,this paper developed the 3D freeform surface error evaluating system for coordinate measuring machine to improve the efficiency.According to the characteristics of coordinate measuring machine,it performed the compensation procedure for the radius of probe ball.In addition,it reconstructed the corresponding B-spline surfaces with the point group.On the basis of matching relationships between the points and surface patches,it improved the calculating efficiency of point-to-surface distance by the judgment of parameters out of range.It is more intuitive and convenient for the results to combine the data report and 3D model.Constructing the 3D error evaluating environment improves the flexibility of the reverse engineering system and makes it more visually oriented to meet the requirements of users.