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Elastic Structure Preserving (ESP) Control for Compliantly Actuated Robots

Keppler, Manuel and Lakatos, Dominic and Ott, Christian and Albu-Schäffer, Alin Olimpiu (2018) Elastic Structure Preserving (ESP) Control for Compliantly Actuated Robots. IEEE Transactions on Robotics. IEEE - Institute of Electrical and Electronics Engineers. ISSN 1552-3098

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Abstract

Physical compliance can be considered one of the key technical properties a robot should exhibit to increase its mechanical robustness. In addition, the accompanying temporal energy storing capabilities enable explosive and energy efficient cyclic motions. But these advantages come at a price, as compliance introduces unwanted intrinsic oscillatory dynamics, underactuation, and reduces the natural frequency of the plant. These aspects make control of the link configuration variables a challenging task. This work presents two novel control methods for implementing link-side motion tracking capabilities and injecting a desired damping characteristic to suppress link vibrations along the reference trajectory for compliantly actuated robots with nonlinear elastic characteristics. We prove their uniform global asymptotic stability by invoking a theorem by Matrosov. Both approaches, namely ESP and ESP+, have in common that they preserve the link-side inertial properties and the elastic structure of the original plant dynamics, hence the name Elastic Structure Preserving control. Apart from that, ESP control focuses on preserving the inertial properties of motor dynamics. While ESP+ control aims at minimizing the dynamic shaping on the motor side. The performance of the feedback control laws have been evaluated on the variable stiffness robot arm DLR Hand Arm System, where the stiffness in each of its joints is highly nonlinear. To the best of our knowledge, this is the first experimentally validated tracking controller for compliantly actuated, multi-joint robots with nonlinear elastic elements.

Item URL in elib:https://elib.dlr.de/127895/
Document Type:Article
Title:Elastic Structure Preserving (ESP) Control for Compliantly Actuated Robots
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Keppler, ManuelManuel.Keppler (at) dlr.deUNSPECIFIED
Lakatos, DominicDominic.Lakatos (at) dlr.deUNSPECIFIED
Ott, ChristianChristian.Ott (at) dlr.dehttps://orcid.org/0000-0003-0987-7493
Albu-Schäffer, Alin OlimpiuAlin.Albu-Schaeffer (at) dlr.deUNSPECIFIED
Date:April 2018
Journal or Publication Title:IEEE Transactions on Robotics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:1552-3098
Status:Published
Keywords:Compliant Robots, Damping Control, Passivity-Based Control, Tracking Control, Variable Stiffness Joints
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Interagierende Robotersteuerung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics (since 2013) > Analysis and Control of Advanced Robotic Systems
Deposited By: Keppler, Manuel
Deposited On:28 Jun 2019 12:52
Last Modified:31 Jul 2019 20:25

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