基于实时重构的自由曲面自适应布点方法

摘要/Abstract

摘要： 针对现有的自适应算法计算量庞大、在工程中可应用性不强的缺陷，提出在等距法布点的基础上，对测量点进行实时重构来指导三坐标测量机根据曲面本身特性自动增加测量点的方法。测量过程中，当通过拟合五次B样条曲线、三次B样条曲面判断现有测量点不满足精度时，利用两侧测量点的曲率半径，计算出需增加测量点的准确位置，重新拟合包含新检测点的检测样本，直到满足精度要求。以曲面样件为例，辅以计算机图形可视化验证该算法，实验结果表明该方法测量精度及重构精度均可满足数字化检测要求，且在工程应用中相比曲率自适应算法其计算量大幅下降，有效提高了曲面检测效率。

关键词: 三坐标测量机, 自由曲面, 布点方法, 实时重构

Abstract: Based on the drawbacks of large calculations and poor applicabilities of existing adaptive algorithms, a real-time reconstruction method of inspection points was proposed to guide the coordinate measuring machine to increase points automatically according to the characteristics of surfaces. In inspection processes, existing inspection points were judged not to satisfy the precision by B-spline lines and surfaces, both sides curvature radius of two inspection points were used to calucate the extract locations of increased inspection points, and surfaces were refitted including new points until accord accuracy requirements. Surface part was taken as an example, supplemented by computer visual graphics to certify the algorithm. The results show that inspections with reconstruction may meet the requirements of accuracy, reduce the calculation amounts to a large extent than that by adaptive algorithm in engineering, and may improve efficiency of inspection surfaces effectively.

Key words: coordinate measuring machine, free-form curved surface, distribution inspection point, real-time reconstruction

中图分类号:

TP391

刘红军;叶文静;纪俐. 基于实时重构的自由曲面自适应布点方法[J]. 中国机械工程.

LIU Hongjun;YE Wenjing;JI Li. Adaptive Distribution of Inspection Points for Free-form Curved Surfaces Based on Real-time Reconstruction[J]. China Mechanical Engineering.

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