A Reconfigurable Omnidirectional Soft Robot Based on Caterpillar Locomotion

Area of Science:

• Robotics
• Soft Robotics
• Biomimetic Engineering

Background:

• Soft robots offer advantages in unstructured environments due to their compliance.
• Omnidirectional motion is crucial for enhanced maneuverability and exploration capabilities.
• Caterpillar locomotion provides a biomimetic model for effective robotic locomotion.

Purpose of the Study:

• To develop a reconfigurable omnidirectional soft robot inspired by caterpillar locomotion.
• To demonstrate the robot's ability to adapt to different environments and tasks through modularity.
• To investigate the potential for autonomous assembly of multiple robotic units.

Main Methods:

• A modular soft robot composed of nine reconfigurable modules in a 3x3 matrix.
• Pneumatic actuation enabling a traveling wave motion mimicking caterpillar locomotion.
• Integration of neodymium-iron-boron (NdFeB) magnets for easy module reconfiguration.

Main Results:

• Achieved omnidirectional motion with three degrees of freedom (X, Y, rotation) on a plane.
• Demonstrated locomotion speeds of 18.5 m/h and rotational speed of 1.63°/s.
• Successfully showcased two configurations: pipe crawling and automatic assembly of two robots into a larger unit.

Conclusions:

• The modular, reconfigurable soft robot effectively achieves omnidirectional movement.
• The design facilitates adaptation to diverse environmental challenges and task requirements.
• The platform shows promise for complex robotic operations, including autonomous cooperative behavior.