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Learning-Based Multifunctional Elbow Exoskeleton Control
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DOI：10.1109/TIE.2021.3116572.png)
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Abstract
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In this article, we propose a learning-based model for multifunctional elbow exoskeleton control, i.e., assist- and resist-as-needed (AAN and RAN). The model consists of online iterative learning and impedance adaptation mechanisms for predictive and variable compliant joint control. The model was implemented on a lightweight (0.425 kg) and portable elbow exoskeleton (i.e., POW-EXO) worn by three subjects, respectively. The implementation relies only on internal pose (e.g., joint position) feedback, rather than physical compliant mechanisms (e.g., springs) and external sensors (e.g., electromyography or force), typically required by conventional exoskeletons and controllers. The proposed model provides a novel technique to achieve multifunctional exoskeleton control with minimal mechatronics and sensing. Interestingly, its RAN control and POW-EXO as a quantification means may reveal interactive (mechanical) impedance variance and invariance in human motor control.
Keywords:
Exoskeletons
Impedance
Adaptation models
Elbow
Torque
Task analysis
Sensors
Force control
robotics and mechatronics
variable compliant control
wearable robots
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7.2
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1.8W
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9.8W
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