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Analysis and applications of reachability and capability maps for robotic manipulators

Porges, Oliver (2014) Analysis and applications of reachability and capability maps for robotic manipulators. DLR-Interner Bericht. 572-2014/34. Master's. Lulea Technical University - Julius-Maximilians University Wurzburg. 65 S.

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Robotic arms are the most popular robots on the market. Technology behind the arm manipulators and their sensors is getting more accessible, which results in an increased interest from both commercial and research communities. Autonomous applications of robotic arms needs a combination of good sensory input and previous knowledge to speed up application development. Path planning for the robotic end effector, required to design a trajectory to move from an initial to a goal position, requires both knowledge of the kinematic structure of the robot as well as sensory information coming from the environment, that helps to identify key elements like the objects to manipulate, surfaces of support or possible obstacles. The kinematic structure that results from a design stage is fixed, and knowledge of the workspace of the robot and its dexterity in this space can be preprocessed to speed up on-line applications. This thesis proposes a novel way to address the problem of computing the workspace of a robotic arm and its dexterity within this space. Our proposed off-line analysis of reachability is designed to answer questions about workspace shape and quality. We show how to use the precomputed structure for on-line grasp selection, operational workspace selection, collision free path planning, path validation or robot pose selection. Our approach builds on top of the concept of reachability and capability maps. Traditional methods to generate such maps use forward or inverse kinematics, and we investigate the advantages and limitations of both. We later propose a hybrid method which combines their advantages while maintaining low generation time. Quality of the results is evaluated by a prediction accuracy test. The structure of the map is designed such that it is also suitable for on-line applications. Real-time visual information is incorporated into the map's data structure to improve real-world interactions such as grasp selection or collision-free path planning. To conclude, several examples of real applications that illustrate the usefulness of the map are presented and discussed.

Item URL in elib:https://elib.dlr.de/93767/
Document Type:Monograph (DLR-Interner Bericht, Master's)
Title:Analysis and applications of reachability and capability maps for robotic manipulators
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Porges, Oliveroliver.porges (at) dlr.deUNSPECIFIED
Date:April 2014
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Number of Pages:65
Keywords:reachability, robotic manipulator
Institution:Lulea Technical University - Julius-Maximilians University Wurzburg
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - On-Orbit Servicing [SY]
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics (since 2013) > Autonomy and Teleoperation
Deposited By: Roa Garzon, Dr. Máximo Alejandro
Deposited On:08 Jan 2015 10:32
Last Modified:31 Jul 2019 19:50

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