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Dynamic Trajectory Generation for Serial Elastic Actuated Robots

Petit, Florian and Lakatos, Dominic and Friedl, Werner and Albu-Schäffer, Alin (2012) Dynamic Trajectory Generation for Serial Elastic Actuated Robots. SYROCO 12, 5.-7. September, Dubrovnik.

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Official URL: http://www.syroco2012.org/index.html

Abstract

Robotic systems can benefit from the introduction of properly chosen joint elasticity. Besides their robustness against rigid impact, the energy saving capabilities may increase the system dynamics. In this paper, a method applicable for robots with serial elastic joints is presented, which embodies a desired oscillatory behavior into the hardware and thereby leads to improved performance. This is achieved by shaping the flexible joint robot as a linear onemode system and embodying the natural frequency of the real intrinsic behavior. An algorithm is presented for shaping the one-mode property and exciting the system via a negative definite damping term in a decoupled coordinate space. The output of the approach is a dynamic trajectory resulting in a coordinated link motion and synchronized transfer of kinetic and potential energy. Furthermore, the dynamic trajectory is commanded to the real robot via a motor PD controller, where asymptotic stability for both subsystems—i.e. the trajectory generator and the controlled robot—is proven. The method is validated on a two-link serial elastic actuated robot. Both, simulation and experiment confirm the eigenmode embodiment, energy efficiency by velocity enlargement between motor and link side motion, and synchronized joint motion.

Item URL in elib:https://elib.dlr.de/79892/
Document Type:Conference or Workshop Item (Paper)
Title:Dynamic Trajectory Generation for Serial Elastic Actuated Robots
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Petit, Florianflorian.petit (at) dlr.deUNSPECIFIED
Lakatos, Dominicdominic.lakatos (at) dlr.deUNSPECIFIED
Friedl, Wernerwernder.friedl (at) dlr.deUNSPECIFIED
Albu-Schäffer, Alinalin.albu-schaeffer (at) dlr.deUNSPECIFIED
Date:2012
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Serial elastic actuated, nonlinear oscillations, modal decoupling, singular perturbation
Event Title:SYROCO 12
Event Location:Dubrovnik
Event Type:Conference
Event Dates:5.-7. September
Organizer:IFAC
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 - RMC - Mechatronik und Telerobotik (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics (until 2012)
Deposited By: Petit, Florian
Deposited On:19 Dec 2012 11:08
Last Modified:31 Jul 2019 19:39

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