A Novel Biomimetic Compliant Structural Skin Based on Composite Materials for Biorobotics Applications

Area of Science:

• Robotics and Biomimetics
• Materials Science

Background:

• Biorobotics aims to mimic animal locomotion, but developing protective, flexible skin for robots remains a challenge.
• Existing robotic skin solutions using soft materials or bellows have limitations in durability and environmental interaction.
• Natural epithelial structures offer a model for advanced robotic skin design.

Purpose of the Study:

• To design and fabricate a novel compliant skin structure for biorobots inspired by natural epithelial tissues.
• To achieve high flexibility, protection, and cost-effectiveness in robotic skin applications.
• To validate the performance of the proposed skin through empirical testing and integration with a robotic platform.

Main Methods:

• A novel compliant structure was designed using rigid iron rings wrapped in soft polyester fabrics.
• The structure was fabricated to allow for theoretically zero elastic modulus during bending and stretching.
• A 20-segment prototype was tested for bending (aerial and underwater) and folding performance.

Main Results:

• The proposed skin structure demonstrated a theoretically zero elastic modulus, enabling high compliance.
• Experimental tests confirmed low resistance and energy consumption during bending and folding.
• The skin prototype was successfully mounted and tested on a fish robot, proving its effectiveness.

Conclusions:

• The developed robotic skin offers a promising solution for enhancing robot mobility and interaction in unstructured environments.
• The simple fabrication process and cost-effectiveness make this design suitable for widespread adoption in biorobotics.
• This biomimetic approach successfully replicates key attributes of natural epithelial structures for advanced robotic applications.