What the study found
A model-based closed-loop controller for reinforced dielectric elastomer actuators was able to improve actuation performance for a facial prosthesis. The designed prosthesis showed a root mean square error of 2.06% in response to electromyography signals from the zygomaticus major muscle, which is responsible for smiling.
Why the authors say this matters
The authors say dielectric elastomer actuators, which are devices proposed as artificial muscle implants, have promising applications for replacing paralyzed facial muscles and restoring movement. The study suggests that precise control of reinforced actuators may support this goal.
What the researchers tested
The researchers investigated the dynamic electro-viscoelastic response of a dielectric elastomer with transversally isotropic properties. They proposed a model for anisotropic viscoelastic dielectric elastomers and used it to describe actuator dynamics and design a closed-loop controller for a facial prosthesis. The model was validated with two types of input signals.
What worked and what didn't
The control system demonstrated efficacy in minimizing error and improving actuation performance. Reinforcing dielectric elastomers with unidirectional fibres was noted as producing substantial uniaxial deformations, with previously reported strains up to 75% higher than isotropic dielectric elastomers.
What to keep in mind
The abstract does not describe detailed limitations beyond the stated validation with two types of input signals. The results reported here are limited to the actuator and prosthesis setup described in the abstract.
Key points
- A closed-loop controller was designed for a reinforced dielectric elastomer actuator used in a facial prosthesis.
- The prosthesis achieved a root mean square error of 2.06% in response to electromyography signals from the zygomaticus major muscle.
- The researchers proposed and validated a model for anisotropic viscoelastic dielectric elastomers.
- The control system was reported to minimize error and improve actuation performance.
- The abstract says dielectric elastomer actuators are proposed as artificial muscle implants for restoring paralyzed facial movement.
Disclosure
- Research title:
- Closed-loop control improved facial prosthesis actuation in reinforced DEAs
- Authors:
- Stefania Konstantinidi, Ning Liu, Raki Ben Mustapha, Simon Holzer, Markus Koenigsdorff, Amine Benouhiba, Yoan Civet, Yves Perriard
- Institutions:
- École Polytechnique Fédérale de Lausanne, Institut Pasteur du Maroc
- Publication date:
- 2026-04-24
- OpenAlex record:
- View
- Image credit:
- Photo by Ludovic Delot on Pexels · Pexels License
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