Error compensation of laser tracker in multi-station measurement

2021 ◽  
Author(s):  
Ruiyan Wang ◽  
Wenji She
Keyword(s):  
Error Compensation ◽  
Laser Tracker

Model establishment and error compensation of laser tracker station-transfer

2019 ◽  
Vol 27 (4) ◽  
pp. 771-773 ◽  
Author(s):  
李 辉 LI Hui ◽  
刘 巍 LIU Wei ◽  
张 洋 ZHANG Yang ◽  
张仁伟 ZHANG Ren-wei ◽  
周志龙 ZHOU Zhi-long ◽  
...  
Keyword(s):  
Error Compensation ◽  
Laser Tracker

Accuracy calibration of a 3-CRU translational parallel robot based on the subset of error measurements

2020 ◽  
pp. 095440622096769
Author(s):  
Tie Zhang ◽  
Guangcai Ma ◽  
Yachao Cao ◽  
Yingwu He
Keyword(s):  
Linear Combination ◽  
Error Compensation ◽  
Calibration Method ◽  
Parallel Robot ◽  
Laser Tracker ◽  
End Effector ◽  
Structural Error ◽  
Robot Accuracy ◽  
Calibration Methods ◽  
Complete Set

Robot accuracy calibration is an effective method to improve its kinematic accuracy. However, most of the existing calibration methods need to measure the complete set of 6-dimensional pose errors of the end-effector, which makes the calibration process especially complicated. In this paper, an accuracy calibration method for a 3-CRU translational parallel robot is proposed based on the subset of error measurements. The process is implemented by four steps: 1) the error model is established based on matrix method. Then the structural errors to be identified are separated. 2) part of pose errors of the end-effector are measured by laser tracker and used to form the subset of error measurements. 3) the minimum structural error linear combination affecting robot accuracy is determined according to the minimum parameter error linear combination theorem. After that, the structural errors can be identified based on the subset of error measurements. 4) error compensation based on the identification results. This method can not only ensure the identifiability of the structural errors, but also can realize error identification based on the subset of error measurements, which will significantly reduce the calibration workload and improve the calibration efficiency. Experiments are carried out to prove the effectiveness of the calibration method.

Angular error compensation for laser tracker

2014 ◽  
Vol 22 (9) ◽  
pp. 2299-2305 ◽  
Author(s):  
卢荣胜 LU Rong-sheng ◽  
李万红 LI Wan-hong ◽  
劳达宝 LAO Da-bao ◽  
周维虎 ZHOU Wei-hu ◽  
丁功明 DING Gong-ming
Keyword(s):  
Error Compensation ◽  
Angular Error ◽  
Laser Tracker

scholarly journals Kinematic calibration of Delta robot using distance measurements

2015 ◽  
Vol 230 (3) ◽  
pp. 414-424 ◽  
Author(s):  
Pujun Bai ◽  
Jiangping Mei ◽  
Tian Huang ◽  
Derek G Chetwynd
Keyword(s):  
Real Time ◽  
Error Compensation ◽  
Error Modeling ◽  
Laser Tracker ◽  
Kinematic Calibration ◽  
Time Error ◽  
Distance Measurements ◽  
Positioning Accuracy ◽  
Delta Robot ◽  
Source Errors

This paper deals with kinematic calibration of the Delta robot using distance measurements. The work is mainly placed upon: (1) the error modeling with a goal to classify the source errors affecting both the compensatable and uncompensatable pose accuracy; (2) the full/partial source error identification using a set of distance measurements acquired by a laser tracker; and (3) design of a linearized compensator for real-time error compensation. Experimental results on a prototype show that positioning accuracy of the robot can significantly be improved by the proposed approach.

Method of Volumetric Error Compensation for 3-Axis NC Machine Tool

2012 ◽  
Vol 472-475 ◽  
pp. 2371-2376 ◽  
Author(s):  
Jin Dong Wang ◽  
Jun Jie Guo ◽  
Yu Fen Deng ◽  
Hai Tao Li
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Geometric Error ◽  
Machining Process ◽  
Laser Tracker ◽  
Machining Accuracy ◽  
Volumetric Error ◽  
Nc Machine Tool ◽  
Nc Machine ◽  
G Code

Error compensation is an effective method to improve the machining accuracy of NC machine tool. A laser tracker is used to rapidly and accurately detect the geometric error of NC machine tool in the paper. The machine tool is controlled to move on the preset path in the space, and a laser tracker is used to measure the motion trajectory of the machine tool. Each geometric error can be identified by error separation. Based on the error model of 3-axis machine tool, error compensation can be carried out by modifying the machining process (G code). Results of experiment show that, this measurement method is feasible, and modifying the G code for error compensation is also effective.

Industrial Robot Error Compensation Using Laser Tracker System

2008 ◽  
Vol 381-382 ◽  
pp. 579-582
Author(s):  
Jian Fei Ouyang ◽  
W. Liu ◽  
Xing Hua Qu ◽  
Y. Yan
Keyword(s):  
Real Time ◽  
Error Compensation ◽  
Industrial Robot ◽  
Laser Tracker ◽  
Geometric Errors ◽  
End Effector ◽  
Geometry Error

A technique to compensate the geometry errors of industrial robot using Laser Tracker System (LTS) has been presented in this paper. A Spherically Mounted Retro-reflector (SMR) is mounted on the end-effector of industrial robot. The positions of SMR are measured by LTS and compared with the nominal value of industrial robot to get geometry error database of robot. The updated error database, together with real-time measuring of the positions on the robot’s end-effector can be used to compensate the geometric errors of the robot. Using this technique to compensate the industrial robot, the geometry errors can be decreased from 0.1mm to 0.04mm.

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