Enhancing Human Walking Economy Through a Biomimetic Cable-Driven Ankle Exoskeleton.

Area of Science:

• Biomechanics and Robotics
• Human Augmentation Technologies

Background:

• Traditional exoskeletons face limitations due to rigid designs and added mass.
• Improving walking economy is crucial for effective gait assistance exoskeletons.

Purpose of the Study:

• To develop and evaluate a cable-driven ankle exoskeleton for targeted plantarflexion assistance.
• To enhance gait assistance by addressing limitations of conventional exoskeleton designs.

Main Methods:

• A compact, lightweight cable-driven exoskeleton inspired by the human muscle-tendon complex.
• A feedback-based cascaded repetitive control system with multi-sensor fusion for precise force control.
• Benchtop and treadmill experiments to evaluate actuation performance and walking economy.

Main Results:

• The exoskeleton demonstrated a bandwidth of approximately 13.5 Hz and a 5% force tracking error.
• Treadmill experiments showed a 7.53% improvement in walking economy compared to unassisted walking.

Conclusions:

• The proposed cable-driven ankle exoskeleton design shows significant potential for improving gait assistance.
• The lightweight and targeted assistance approach advances the development of effective exoskeletons.