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A Mechanized Pediatric Elbow Joint Powered by a De-Based Artificial Skeletal Muscle
Summary
Dielectric elastomer actuators (DEAs) show promise as soft actuators for rehabilitation robots. These artificial muscles generated significant force and motion, but performance decreased under higher loads, limiting current exoskeleton applications.
Area of Science:
- Robotics
- Materials Science
- Biomechanics
Background:
- Exoskeletons require safe, human-compatible actuators.
- Dielectric elastomer actuators (DEAs) offer a potential soft actuation solution.
Purpose of the Study:
- Investigate DEAs for muscle-like actuation in rehabilitation robots.
- Evaluate the force, shortening, and motion capabilities of DEA-based artificial muscles.
Main Methods:
- Configured artificial muscles using stacked DEAs in 3x4 and 3x5 arrays.
- Measured force and shortening of the 3x4 muscle.
- Mounted the 3x5 muscle on a phantom model to actuate an elbow joint under varying loads (1-4 N).
- Utilized motion capture to record range of motion and angular velocity.
Main Results:
- The 3x4 artificial muscle generated 30.47 N force and 5.3 mm shortening.
- The 3x5 muscle achieved 19.5° elbow flexion at 16.2 °/s under a 1 N load.
- Actuation range of motion significantly decreased with increasing tensile loads.
Conclusions:
- DEAs can perform muscle-like actuation for rehabilitation robots.
- Load-dependent performance reduction limits current DEA applications in upper extremity exoskeletons.
