Finding Optimal Placement of the Almost Spherical Parallel Mechanism in the Recupera-Reha Lower Extremity Exoskeleton for Enhanced Workspace
Ibrahim Tijjani
Editors: Andreas Müller, Mathias Brandstötter
In Advances in Service and Industrial Robotics, (RAAD-2022), 08.6.-10.6.2022, Klagenfurt am Wörthersee, Springer International Publishing, series Mechanisms and Machine Science, volume 120, pages 536-544, Apr/2022. ISBN: 978-3-031-04870-8.

Zusammenfassung (Abstract) :

The ankle joint of an exoskeleton plays a vital role in maintaining balance and posture during locomotion by grounding the upper body's weight. Parallel designs are advantageous for constructing ankle joints in exoskeleton but challenges include complex workspace analysis and finding the optimal placement in the overall structure of the exoskeleton. This paper presents a strategy for finding the optimal placement of the prototype Active Ankle 3[R2[US]] mechanism in the Recupera-Reha lower extremity exoskeleton for enhanced workspace. To this end, rotative inverse geometric model of the Active Ankle is exploited to find the alignment between principle human joint axes and axes along which the range of motion is optimum. It is demonstrated that by rotating the mechanism along the adduction-abduction axis and by selecting appropriate ball and socket joints, it is possible to enhance the usable workspace of the mechanism for the human wearing the exoskeleton.

Stichworte :

Spherical-parallel manipulators · Kinematic analysis · Optimal placement point · Exoskeletons and prosthesis devices




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