Model-free Friction Observers for Flexible Joint Robots with Torque Measurements
Robotics
2019-07-02 v1 Systems and Control
Systems and Control
Abstract
This paper tackles a friction compensation problem without using a friction model. The unique feature of the proposed friction observer is that the nominal motor-side signal is fed back into the controller instead of the measured signal. By doing so, asymptotic stability and passivity of the controller are maintained. Another advantage of the proposed observer is that it provides a clear understanding for the stiction compensation which is hard to be captured in model-free approaches. This allows to design observers that do not overcompensate for the stiction. The proposed scheme is validated through simulations and experiments.
Keywords
Cite
@article{arxiv.1907.00553,
title = {Model-free Friction Observers for Flexible Joint Robots with Torque Measurements},
author = {Min Jun Kim and Fabian Beck and Christian Ott and Alin Albu-Schaeffer},
journal= {arXiv preprint arXiv:1907.00553},
year = {2019}
}
Comments
IEEE Transactions on Robotics