文胸模杯曲面形态特征曲线提取与分析

Extraction and analysis of surface morphology characteristic curves from bra mold cup

为获得控制文胸模杯曲面形态的特征曲线,实现模杯的正向设计,采用三维扫描仪获取模杯的点云数据,用逆向工程软件进行实体模型构建,然后根据模杯角度及特征点构建了26条模杯内外曲面形态曲线。利用各曲线拐点、峰值点、曲率最大点及最小点的分布位置一致性,提取能够反映模杯曲面特征信息的内外曲面形态特征曲线5条。结果表明:模杯结构特征曲线上的几何参数分布离散程度更小,较角度特征曲线更能反映不同类型模杯的曲面形态特征。拟合各特征曲线弧长与模杯杯深的函数关系,通过改变形态特征曲线上的几何参数可控制曲面形态结构。

To achieve the forward engineering design of the mold cup development and acquire the characteristic curves which could control the bra cup surface type, 3-D scanner was used to acquire point cloud data of the mold cup, and the mold cup model was built with reserve engineering software, and then 26 mold cup internal and external surface curves were obtained accirding to the feature points and maximum points and minimun points distrebution, 5 mold cup interior and exterior surface characteristic curves were extracted to demonstrate the feature information of the cup surface. The experimental results show that the discrete degree of different geometric parameters＇ distributions of model cup structure characteristic curves is more uniform than that of angle characteristic curves. Therefore, the model cup structure characteristic curves can reflect more morphological characteristics of different types of mold cups surface. By fitting, the relationships between arc length of characteristic curves and the cup depth vere achieved. The control on the curve surface morphological structure could be realized by changing the geometric parameters on the morphological characteristic curves.