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Bidirectional antagonistic variable stiffness actuation: Analysis, design & Implementation | IEEE Conference Publication | IEEE Xplore

Bidirectional antagonistic variable stiffness actuation: Analysis, design & Implementation


Abstract:

The variable stiffness actuation concept is considered to provide a human-friendly robot technology. This paper examines a joint concept called the bidirectional antagoni...Show More

Abstract:

The variable stiffness actuation concept is considered to provide a human-friendly robot technology. This paper examines a joint concept called the bidirectional antagonistic joint which is a extension of antagonistic joints. A new operating mode called the helping mode is introduced, which increases the joint load range. Although the joint can not be pretensioned in the helping mode, it is shown that a stiffness variation is possible, assuming a suitable torque-stiffness characteristic of the elastic elements. A methodology to design such characteristics is presented along with several example cases interpreted in a torque-stiffness plot. Furthermore, a stiffness adaptation control scheme which ensures mechanism safety is described. Finally, the design methodology and the control are evaluated on an implementation of a bidirectional antagonistic joint.
Date of Conference: 03-07 May 2010
Date Added to IEEE Xplore: 15 July 2010
ISBN Information:
Print ISSN: 1050-4729
Conference Location: Anchorage, AK, USA

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