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H Synthesis Method for Control of Non-linear Flexible Joint Models
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Katholieke Universiteit, Leuven, Belgium.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
2013 (English)Report (Other academic)
Abstract [en]

An H synthesis method for control of a flexible joint, with non-linear spring characteristic, is proposed. The first step of the synthesis method is to extend the joint model with an uncertainty description of the stiffness parameter. In the second step, a non-linear optimisation problem, based on nominal performance and robust stability requirements, has to be solved. Using the Lyapunov shaping paradigm and a change of variables, the non-linear optimisation problem can be rewritten as a convex, yet conservative, LMI problem. The method is motivated by the assumption that the joint operates in a specific stiffness region of the non-linear spring most of the time, hence the performance requirements are only valid in that region. However, the controller must stabilise the system in all stiffness regions. The method is validated in simulations on a non-linear flexible joint model originating from an industrial robot.

Place, publisher, year, edition, pages
Linköping, 2013. , 6 p.
Series
LiTH-ISY-R, ISSN 1400-3902 ; 3068
Keyword [en]
Mechanical systems, Flexible, Robust, H-infinity Control
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-100891ISRN: LiTH-ISY-R-3068OAI: oai:DiVA.org:liu-100891DiVA: diva2:664195
Projects
Vinnova Excellence Center LINK-SIC
Funder
Vinnova
Available from: 2013-11-14 Created: 2013-11-14 Last updated: 2014-06-16Bibliographically approved

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Axelsson, PatrikHelmersson, AndersNorrlöf, Mikael

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf