Maximal Performance of an Antagonistically Coupled Dielectric Elastomer Actuator System

Area of Science:

• Materials Science
• Robotics Engineering
• Biomimetics

Background:

• Dielectric elastomer actuators (DEAs) offer large electrically induced strains (>500%) suitable for soft robotics.
• Maximizing actuation strain and energy storage in DEAs is crucial for diverse applications.
• Existing research explores various methods to enhance DEA performance.

Purpose of the Study:

• To analyze and optimize antagonistically coupled DEAs for enhanced actuation stroke, force, and energy output.
• To investigate DEA performance reminiscent of biological muscle systems.
• To determine optimal prestretch conditions for maximizing DEA actuation sweep.

Main Methods:

• Theoretical analysis of antagonistically coupled DEAs to identify optimal operating conditions.
• Experimental characterization of actuation stroke, force, and mechanical work.
• Quantification of actuation sweep as a percentage of displacement.

Main Results:

• Predicted optimal prestretch for DEAs yielding a 59% actuation sweep.
• Achieved a 55% actuation sweep in experimental setups.
• Characterized significant electrically induced displacement, force, and work done.

Conclusions:

• Developed an antagonistic soft actuator system with simple geometry.
• Demonstrated efficacy of the DEA system, mimicking biological muscle capabilities.
• The system provides significant electrically induced displacement, force, and work done for soft robotic applications.