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Development of Variable Elastic Band with Adjustable Elasticities for Semi-Passive Exosuits
Jaewook Ryu1, Gyeongmo Kim1, Giuk Lee1
1School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
This study introduces a novel variable elastic band for semi-passive exosuits, overcoming limitations of current designs. This innovation allows for customizable stiffness, enhancing assistive force profiles for diverse movements.
Area of Science:
- Biomechanics
- Rehabilitation Engineering
- Materials Science
Background:
- Active exosuits face challenges with battery life, weight, and maintenance.
- Passive exosuits offer advantages in cost and usability but have fixed stiffness, limiting assistive force profiles.
- Existing exosuit technologies present a trade-off between functionality and practicality.
Purpose of the Study:
- To develop a variable elastic band for semi-passive exosuits.
- To enable customizable stiffness and adaptable assistive force profiles.
- To overcome the limitations of fixed elasticity in passive exosuit designs.
Main Methods:
- A novel variable elastic band composed of rubber bands and webbings connected in parallel and series.
- Restricting rubber band elongation based on webbing length to control elasticity.
- Experimental validation of stiffness generation and predictive modeling using coefficient of determination (R²).
Main Results:
- The variable elastic band successfully generated a range of stiffness levels.
- Stiffness levels were accurately predicted with an average R² of 0.9985.
- Participant testing demonstrated effective modulation of assistive force profiles.
Conclusions:
- The proposed variable elastic band enhances semi-passive exosuits by offering adjustable stiffness.
- This innovation addresses limitations of passive exosuits, enabling greater customization.
- The findings pave the way for improved efficiency and adaptability in passive exosuit systems.
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