关键词: 整体叶轮, 几何特征, 三维测量, 对齐

Abstract: A model alignment method was proposed based on geometric features, and applied to a 3D model of integral impellers. First, centroid of the measured models was extracted. According to the symmetry features of the integral impeller, the least square algorithm was utilized to estimate the rotational axis and was modified by the more accurate data of shaft part. Therefore, the centroids and rotational axes of the measured models were aligned with those of the CAD models. Then, the aligning of the blade parts of the measured models with the CAD models was realized by using weighted least squares method according to the characteristics of manufacture precision. The maximum alignment deviation caused by the proposed method is as 0.2mm.

Key words: integral impeller, geometric feature, 3D measurement, alignment