圆度误差评定中的一种新的删点技术

在圆度误差评定过程中，针对以往几种方法以采样点数据筛选过程中可能出现的误删和错删现象，本文提出一种新的删点技术，即采用凸壳理论实现对特征点的筛选，其实质是将寻找特征点的问题转化为求解壳顶点的问题，利用凸多边形的几何不变性来确保删点结果的准确性和唯一性，并大大简化运算过程中和提高运算速度，经过与实测结果的对比分析，证明了本文提出的删点技术正确可行。

A new technology to delete sample datum in the process of evaluating roundness error

Contrast to the several traditional methods that maybe cause to delete sample datum incorrectly,the paper puts forward a new technology to delete datum that uses convex hull theory to get the characteristic datum in the process of evaluating roundness error.The new method transforms searching the characteristic data to seeking the vertex of the convex hull.The algorithm takes advantage of the geometric stablility of convex polygon to ensure the precise and unity of calculation result,simplifies calculating processes and improves the calculating speed greatly. At the same time,the measuring experiment testifies the correctness and feasibility of the delete technology in the paper.