Related Experiment Video
Updated: Nov 19, 2025
08:24
Bioinspired Soft Robot with Incorporated Microelectrodes
Published on: February 28, 2020
9.1K
Dielectric Elastomer Actuator Driven Soft Robotic Structures With Bioinspired Skeletal and Muscular Reinforcement
M Franke1, A Ehrenhofer2, S Lahiri1
1Institute of Semiconductors and Microsystems (IHM), Technische Universität Dresden, Dresden, Germany.
Frontiers in Robotics and AI
|January 27, 2021
Summary
Researchers developed a novel soft robotic structure using dielectric elastomer actuators (DEAs) as artificial muscles. This bioinspired design integrates a skeletal system to maintain optimal pre-stretch for enhanced robotic bending motion.
Area of Science:
- Robotics
- Materials Science
- Biomimetics
Background:
- Dielectric elastomer actuators (DEAs) offer soft, lightweight artificial muscles for robotic systems.
- Optimal performance of DEAs requires sufficient pre-stretch, which is challenging to integrate into soft robotic structures.
- Bioinspired designs can overcome limitations in current soft robotics by mimicking natural skeletal and muscular systems.
Purpose of the Study:
- To present a novel soft robotic structure with a bioinspired skeleton and DEA artificial muscles for controlled bending motion.
- To achieve and maintain optimal isotropic pre-stretch in DEAs within a soft robotic system at equilibrium.
- To investigate the influence of structural parameters on the robotic system's performance.
Main Methods:
- Integration of a bioinspired skeleton (3D printed struts) into a flexible silicone body.
- Utilizing an antagonistic pair of DEA artificial muscles for robotic actuation.
- Manufacturing DEAs via aerosol deposition of a carbon-silicone-composite ink.
- Characterizing static and dynamic bending displacement, resonance frequencies, and blocking forces.
- Developing an analytical model based on Classical Laminate Theory.
Main Results:
- The soft robotic structure demonstrated large and defined bimorph bending curvature.
- The integrated skeletal elements enabled anisotropic bending stiffness, allowing motion in a single plane.
- The system maintained optimal DEA pre-stretch in its equilibrium state.
- Experiments detailed the effects of membrane pre-stretch and silicone body stiffness on performance metrics.
- An analytical model was presented for parameter identification.
Conclusions:
- The bioinspired soft robotic structure effectively utilizes DEAs and an integrated skeleton for controlled bending.
- The design ensures optimal DEA pre-stretch, enhancing robotic performance and stability.
- This approach offers a simple, versatile platform for a wide range of robotic applications requiring bioinspired motion.
