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ACE-Ankle: A Novel Sensorized RCM (Remote-Center-of-Motion) Ankle Mechanism for Military Purpose Exoskeleton

Published online by Cambridge University Press:  17 June 2019

Man Bok Hong Open the ORCID record for Man Bok Hong [Opens in a new window] ,
Gwang Tae Kim Open the ORCID record for Gwang Tae Kim [Opens in a new window]  and
Yeo Hun Yoon Open the ORCID record for Yeo Hun Yoon [Opens in a new window]
Man Bok Hong*
Affiliation:
Ground Technology Research Institute, Agency for Defense Development, Daejeon, Korea. E-mails: [email protected], [email protected]
Gwang Tae Kim
Affiliation:
Ground Technology Research Institute, Agency for Defense Development, Daejeon, Korea. E-mails: [email protected], [email protected]
Yeo Hun Yoon
Affiliation:
Ground Technology Research Institute, Agency for Defense Development, Daejeon, Korea. E-mails: [email protected], [email protected]
*
*Corresponding author. E-mail: [email protected]
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Summary

This paper presents a novel three-degree of freedom (DOF) sensorized remote-center-of-motion (RCM) ankle module for a military-purpose lower-limb exoskeleton. A military-purpose exoskeleton should assist and follow the fast and dexterous motion of a soldier in rough terrain environments. Among the lower-limb joints, the ankle joint plays an important role in stabilizing walking motion during the stance phase. Thus, aligning the rotation center of the ankle module with the center of the wearer’s ankle is very important to reduce potential risks and fatigue of a soldier. To this end, the ankle exoskeleton was designed using two spherical chains. The two spherical chains were designed such that the intersection of all revolute pairs, which consist of the spherical chains, is located close to the rotation center of the wearer’s ankle. In addition, three encoders are attached to each of the three revolute pairs of a spherical chain to measure the three-DOF orientation of the ankle mechanism. For the design, the required range of motion is analyzed via gait analysis in three environment conditions. Forward and inverse kinematic relations are derived, and the workspace of the ankle is analyzed. For the prototype ankle mechanism, the range of motion and measurement performance are verified by a static experiment. In addition, comparative studies between the proposed RCM ankle and an ankle mechanism with offset rotation center are performed for three walking conditions: level walking, ascending and descending stairs, and a vertical slope. Via comparative study, it is confirmed that, compared to the ankle mechanism with offset center of rotation, the proposed RCM ankle is advantageous for sensing wearer’s ankle motion and reducing mechanical interference to wearer’s natural ankle motion.

Keywords

ExoskeletonAnkle mechanismRCM mechanismSpherical linkageOrientation mechanism
Type
Articles
Information
Robotica , Volume 37 , Special Issue 12: Wearable Robotics: Dynamics, Control and Applications , December 2019 , pp. 2209 - 2228
Copyright
© Cambridge University Press 2019 

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