To read the full version of this content please select one of the options below:

Calibration of a six-axis parallel manipulator based on BP neural network

Dianjin Zhang (Harbin Institute of Technology, Harbin, China)
Guangyu Zhang (Harbin Institute of Technology, Harbin, China)
Longqiu Li (Harbin Institute of Technology, Harbin, China)

Industrial Robot

ISSN: 0143-991x

Article publication date: 21 August 2019

Issue publication date: 21 August 2019

Abstract

Purpose

This paper aims to provide a simple and flexible calibration method of parallel manipulators for improving the position accuracy only using partial pose information.

Design/methodology/approach

The overall idea of this method is to use BP neural network to fit the relationship between calibration parameters and measurement parameters and then adjust calibration parameters according to measurements.

Findings

The calibration method significantly improves the position accuracy of the six-axis parallel manipulator. Simulation shows that the accuracy can be improved by increasing the number of positions consisted of samples to train BP neural network, and when the position number is increased, the descent velocity of fitting error is decreased.

Originality/value

The method is general for various parallel mechanisms and simple for measurement process. It can be applied to the calibration of various mechanisms without analyzing the mathematical relationship between measurements and calibration parameters. The measurement parameters can be flexibly selected to simplify measurement process, which saves calibration cost and time.

Keywords

Acknowledgements

This study was funded by National Natural Science Foundation of China (51574098) and Shanghai Aerospace Science and Technology Innovation Fund (SAST2016023).

Citation

Zhang, D., Zhang, G. and Li, L. (2019), "Calibration of a six-axis parallel manipulator based on BP neural network", Industrial Robot, Vol. 46 No. 5, pp. 692-698. https://doi.org/10.1108/IR-12-2018-0248

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited