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Kinematic calibration of serial manipulators using Bayesian inference

Published online by Cambridge University Press:  25 January 2018

Elie Shammas*
Affiliation:
Department of Mechanical Engineering and Department of Civil and Environmental Engineering American University of Beirut, Beirut, Lebanon. E-mail: sn06@aub.edu.lb
Shadi Najjar
Affiliation:
Department of Mechanical Engineering and Department of Civil and Environmental Engineering American University of Beirut, Beirut, Lebanon. E-mail: sn06@aub.edu.lb
*
*Corresponding author. E-mail: es34@aub.edu.lb

Summary

In this paper, a new calibration method for open-chain robotic arms is developed. By incorporating both prior parameter information and artifact measurement data, and by taking recourse to Bayesian inference methods, not only are the robot kinematic parameters updated but also confidence bounds are computed for all measurement data. In other words, for future measurement data not only the most likely end-effector configuration is estimated but also the uncertainty represented as 95% confidence bounds of that pose is computed. To validate the proposed calibration method, a three degree-of-freedom robotic arm was designed, constructed, and calibrated using both typical regression methods and the proposed calibration method. The results of an extensive set of experiments are presented to gauge the accuracy and utility of the proposed calibration method.

Type
Articles
Copyright
Copyright © Cambridge University Press 2018 

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