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A buckling-sheet ring oscillator for electronics-free, multimodal locomotion.

Won-Kyu Lee1, Daniel J Preston1,2, Markus P Nemitz1,2

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This study introduces a novel buckling-sheet ring oscillator (BRO) for soft robot locomotion. This simple, low-cost device generates complex movements from a single pressure input, enabling versatile motion on varied terrain.

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Area of Science:

  • Robotics
  • Materials Science
  • Fluid Dynamics

Background:

  • Soft robot locomotion often requires complex electronic control systems and hard valves.
  • Existing soft pneumatic oscillators face limitations in airflow rate or fabrication complexity.

Purpose of the Study:

  • To develop a novel soft pneumatic oscillator for efficient soft robot locomotion.
  • To create a device that simplifies control by generating complex movements from a single input pressure.

Main Methods:

  • Fabrication of a pneumatic oscillator using flexible, inextensible sheets (acetate, nylon film, double-sided tape) and an elastomeric tube.
  • Integration of three instabilities: out-of-plane buckling, tubing kinking, and a system-level instability from pneumatic inverters.
  • Assembly into a "buckling-sheet ring oscillator" (BRO) for self-generated motion.

Main Results:

  • The BRO achieves high airflow rates suitable for practical locomotion.
  • The device enables both translational and rotational motion on varied terrain.
  • The BRO facilitates locomotion against gravity and buoyant forces underwater.

Conclusions:

  • The buckling-sheet ring oscillator offers a simple, low-cost, and effective solution for soft robot locomotion.
  • This technology reduces the need for complex controllers, paving the way for more autonomous soft robots.
  • The BRO's ability to generate movement through interaction with its environment is a significant advancement in soft robotics.