Robust stabilization of elastic joint robots by ESP and PID control: Theory and experiments

M Keppler, C Raschel, D Wandinger… - IEEE Robotics and …, 2022 - ieeexplore.ieee.org
This work addresses the problem of global set-point control of elastic joint robots by
combining elastic structure preserving (ESP) control with non-collocated integral action …

Joint-level control of the DLR lightweight robot SARA

M Iskandar, C Ott, O Eiberger, M Keppler… - 2020 IEEE/RSJ …, 2020 - ieeexplore.ieee.org
Lightweight robots are known to be intrinsically elastic in their joints. The established
classical approaches to control such systems are mostly based on motor-side coordinates …

From underactuation to quasi‐full actuation: Aiming at a unifying control framework for articulated soft robots

M Keppler, C Ott, A Albu‐Schäffer - International Journal of …, 2022 - Wiley Online Library
We establish a structure preserving state and input transformation that allows a class of
underactuated Euler Lagrange systems to be treated as “quasi‐fully” actuated. In this …

Robust elastic structure preserving control for high impedance rendering of series elastic actuator

H Lee, J Lee, M Keppler, S Oh - IEEE Robotics and Automation …, 2024 - ieeexplore.ieee.org
In this letter, a new robust approach is proposed to address the limitation of impedance
rendering for Series Elastic Actuators (SEA). The concept of Elastic Structure Preserving …

Simultaneous motion tracking and joint stiffness control of bidirectional antagonistic variable-stiffness actuators

M Harder, M Keppler, X Meng, C Ott… - IEEE Robotics and …, 2022 - ieeexplore.ieee.org
Since safe human-robot interaction is naturally linked to compliance in these robots, this
requirement presents a challenge for the positioning accuracy. The class of variable …

Adaptive lead-through teaching control for spray-painting robot with closed control system

Y Liu, B Zi, Z Wang, S Qian, L Zheng, L Jiang - Robotica, 2023 - cambridge.org
Industrial robots are widely used in the painting industry, such as automobile manufacturing
and solid wood furniture industry. An important problem is how to improve the efficiency of …

Passivity controller based on load-side dam** assignment for high stiffness controlled series elastic actuators

H Lee, JH Ryu, J Lee, S Oh - IEEE Transactions on Industrial …, 2020 - ieeexplore.ieee.org
This article offers a new insight to the achievable stiffness limitation of the impedance control
of series elastic actuators (SEAs) by suggesting a comparative analysis of energy ports and …

Impact Robustness vs. Torque Bandwidth: A Design Guide for Differential Elastic Actuators

A Shu, C Raschel, M Keppler… - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
Differential elastic actuators connect a motor and a spring via differential gears to a shared
output shaft, offering a more compact solution for creating mechanically robust systems than …

Analyzing the performance limits of articulated soft robots based on the ESPi framework: Applications to dam** and impedance control

M Keppler, F Loeffl, D Wandinger… - IEEE Robotics and …, 2021 - ieeexplore.ieee.org
In situations of harsh impacts, dam** injection directly on the link of an articulated soft
robot is challenging and usually requires high actuator torques at the moment of impact. In …

Model-Free Variable Impedance Control for Upper Limb Rehabilitation Robot

M Aichaoui, A Ikhlef - Arabian Journal for Science and Engineering, 2024 - Springer
This paper presents an innovative approach to control upper-limb rehabilitation robots for
both passive and active-assistive rehabilitation therapy. In contrast to conventional model …