基于CAD模型的碳纤维复合材料天线反射面精度测量

A Method for Carbon Fiber Reinforced Composite Reflector Precision Measurement Based on CAD Model

针对天线反射面研制过程中的精度测量,提出一种基于CAD模型的自动测量技术和反射面数据处理技术的精度测量方法。在测点均匀布局规划和工件与模型对齐的基础上,自动获取反射面的完整测量数据,利用最优化算法使实测数据和理论模型达到最佳匹配,实现反射面面形精度的准确评价并获得变换矩阵。最终通过偏差矢量图表达天线反射面的面形偏差趋势,并利用获得的变换矩阵修正加工基准,有效保证了反射面的成型精度和加工精度,工程应用表明该方法较好地满足了反射面制造过程中的测量需求。

Aimed at the precision measurement during the manufacture process of antenna reflector, a measurement method based on automatic measurement technique using CAD model and data process technique was proposed. Through the planning of measuring points and aligning of workpiece with CAD model, the complete measuring data of reflector were acquired automatically. The optimum matching between the measuring data and the CAD model was achieved by the optimization algorithm, then the surface accuracy of the reflector was precisely evaluated. The transformation matrix was also obtained. Finally, the surface deviation trend of the antenna reflector was expressed by the deviation vector graph, and the datum was corrected by using the transformation matrix, which ensured the surface accu- racy and machining accuracy of reflector. The practical application has indicated that the method could meet the measurement requirements of reflector.