综合叶片的离心率、似圆率和这两个边界曲率特征来检索叶片数据库，进行形状匹配，实现叶片自动分类。
The system retrieved and classified the leaf by shape matching with the samples in a leaves database by eccentricity, circularity and the curvature features.
采用流线曲率法计算有厚叶片又流面的流动。
Theflow field in the S2 surface with thick blades is calculated by stream line curvature method.
提出了一种汽轮机叶片五轴数控加工的实用方法，对于叶背和叶盆采用中凹盘形铣刀，基于密切曲率法给出优化刀位轨迹的计算方法；
This paper presents an approach to machine steam turbine blades in 5-axis NC. By means of using a disc cutter with a concave end, curvature fitting is used to machine the convex and concave surface.
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