Residual index for measurement configuration optimization in robot kinematic calibration
作者机构：State Key Laboratory of Tribology in Advanced Equipment and Institute of Manufacturing EngineeringDepartment of Mechanical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipment and ControlBeijing 100084China
出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)
年 卷 期：2023年第66卷第7期
页 面：1899-1915页
核心收录：
学科分类：08[工学] 080202[工学-机械电子工程] 0802[工学-机械工程] 0811[工学-控制科学与工程]
基 金：supported by the National Natural Science Foundation of China (Grant No.51975321) EU H2020-MSCA-RISE-ECSASDPE (Grant No.734272) Tsinghua-Jiangyin Innovation Special Fund (Grant No.TJISF 2022JYTH01)。
主 题：residual index observability index kinematic calibration measurement configuration optimization
摘 要：To improve the efficiency and accuracy of kinematic calibration,the selection of measurement configurations is an important issue.In previous research,optimal measurement configurations mainly are selected by maximizing observability indices.However,the traditional observability indices only focus on the identification efficiency of the error parameters,while the purpose of robot kinematic calibration is to improve accuracy.To solve the inconsistency of the purpose between the observability index and calibration,the concept of the residual index to represent the residual distribution of the end effector after robot kinematic calibration with the measurement noise is proposed.Based on the quadratic form minimization of residuals,this article defines a specific residual index,O^(r),which is dimensionless and strictly better with the increase of measurement configurations.The indices are used to select measurement configurations in the kinematic calibration of a 5-DOF 2UPU/SP-RR hybrid robot,and the calibration results show that the proposed residual index is better than the traditional indices in the accuracy and stability of the end effector residual.
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