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https://hdl.handle.net/2440/83767
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Type: | Conference paper |
Title: | Active preload control of a redundantly actuated Stewart platform for backlash prevention |
Author: | Ding, B. Cazzolato, B. Grainger, S. Stanley, R. Costi, J. |
Citation: | Proceedings, IEEE International Conference on Robotics and Automation, 2013: pp.1908-1915 |
Publisher: | IEEE |
Publisher Place: | USA |
Issue Date: | 2013 |
Series/Report no.: | IEEE International Conference on Robotics and Automation ICRA |
ISBN: | 9781467356411 |
ISSN: | 1050-4729 2577-087X |
Conference Name: | IEEE International Conference on Robotics and Automation (2013 : Karlsruhe, Germany) |
Statement of Responsibility: | Boyin Ding, Benjamin S. Cazzolato, Steven Grainger, Richard M. Stanley, and John J. Costi |
Abstract: | There is an increasing trend to use Stewart platforms to implement ultra-high precision tasks under large external loads (e.g. biomechanical testing) mainly due to their high stiffness, and high load carrying capacity. However, the backlash or joint clearance in the system can significantly degrade the accuracy. This work studied the application of actuation redundancy in a general Stewart platform to regulate the preloads on its active joints for the purpose of backlash prevention. A novel active preload control method was proposed to achieve a real-time approach that is robust to large six degree of freedom external loads. The proposed preload method applies an inverse-dynamics based online optimization algorithm to calculate the desired force trajectory of the redundant actuator, and uses a force control scheme to achieve the required force. Simulation results demonstrate that this method is able to eliminate backlash inaccuracies during application of large external loads and therefore ensure the precision of the system. |
Keywords: | Backlash prevention Stewart platform redundant actuation inverse dynamics online optimization force control |
Rights: | ©2013 IEEE |
DOI: | 10.1109/ICRA.2013.6630830 |
Published version: | http://dx.doi.org/10.1109/icra.2013.6630830 |
Appears in Collections: | Aurora harvest 4 Mechanical Engineering conference papers |
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