基于距离约束的关节式坐标测量机蛙跳测量方法研究  

Research on Leapfrog Measurement Method of Articulated Coordinate Measuring Machine Based on Distance Constraint

作　　者：刘士达 赵会宁[1] 于连栋[1] LIU Shi-da;ZHAO Hui-ning;YU Lian-dong(School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei,Anhui 230009,China)

机构地区：[1]合肥工业大学仪器科学与光电工程学院

出　　处：《计量学报》2020年第1期1-5,共5页Acta Metrologica Sinica

基　　金：国家自然科学基金(51875165);国家重大科学仪器设备开发专项(2013YQ220893)

摘　　要：针对关节式坐标测量机(ACMM)在大尺寸工件的检测过程中测量范围有限且误差较大的问题,提出了一种基于距离约束的ACMM的蛙跳测量方法。在ACMM进行坐标转换的过程中,利用蛙跳球作为公共基准点,用高精度的三坐标测量机对蛙跳球之间的空间位置关系进行标定。在计算坐标转换参数的过程中,将任意两蛙跳球之间的位置关系作为距离约束条件,消除测量过程中产生的粗大误差并优化坐标转换模型的参数,以提高坐标转换精度。实验结果表明:距离约束能够有效地提高坐标转换参数的精度,同时增加公共基准点的个数会较大地提高蛙跳测量精度。To solve the problem that the measuring range of articulated coordinate measuring machine(ACMM)is limited and the error is large in the large scale measurement,a leapfrog measuring method on ACMM based on the distance constraint is proposed.In the process of coordinate transformation of ACMM,leapfrog balls are used as the public reference points and the spatial position relation between leapfrog balls is calibrated by the high accurate CMM.In the process of calculating coordinate transformation parameters,the distance between any two leapfrog balls is taken as the distance constraint.The gross error existing in measurement result is eliminated and the parameters of coordinate transformation model are optimized to improve the accuracy of coordinate transformation.The experimental results show that the distance constraint can effectively improve the accuracy of coordinate transformation parameters,and the number of public reference points can also greatly improve the accuracy of leapfrog measurement.

关 键 词：计量学 大尺寸测量 蛙跳测量方法 距离约束 ACMM 坐标转换 

分 类 号：TB921[一般工业技术—计量学]