【摘要】 汽车覆盖件曲面是复杂的三维自由曲面。根据覆盖件形状的特点,提出利用覆盖件曲面的三个主惯性轴作为描述覆盖件曲面的坐标系,从而得到了曲面的平移、旋转不变描述。然后取曲面的边界投影线及一组截面线,利用改进了的不变矩方法计算这些曲线的特征矢量。最后根据两个曲面对应的截面线及边界投影线的相似度计算两个曲面的相似度。更多还原

【Abstract】 Vehicle cover panel surface is a kind of complicated 3D free surface. The surface under the primary inertia axes coordinate system is proposed. Under the proposed coordinate system, the surface equation will keep invariant when the surface is translated or rotated. After extracting the surface’s outline projection curve and section curves, the curve’s feature vectors with a reformed invariant moment method are calculated. At last, the similarity between two surfaces is figured out based on the similarity between the section curves.更多还原