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Soft Pneumatic Actuator with Bimodal Bending Response Using a Single Pressure Source.

David Rostin Ellis1, Martin Philip Venter1, Gerhard Venter1

  • 1Department of Mechanical and Mechatronic Engineering, Stellenbosch University, Stellenbosch, South Africa.

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Summary

This study introduces a novel bimodal design for soft pneumatic actuators (SPAs) using a bilinear material, enabling actuators to change bending direction with increasing pressure. This offers greater control and versatility in SPA applications.

Keywords:
bilinear materialbimodal bendingsoft pneumatic actuator

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Area of Science:

  • Robotics and Mechanical Engineering
  • Materials Science

Background:

  • Soft pneumatic actuators (SPAs) typically exhibit unimodal bending.
  • Preprogramming deformation behavior is crucial for SPA functionality.

Purpose of the Study:

  • To develop a method for achieving bimodal bending in SPAs.
  • To introduce a bilinear material as a strain limiter for controlled deformation.

Main Methods:

  • Replacing conventional strain limiters with a bilinear material.
  • Designing and manufacturing physical actuators with the new material.
  • Correlating physical tests with preliminary numerical models.

Main Results:

  • Demonstrated actuators with distinctly different deformation directions at varying pneumatic pressures.
  • Observed a preferential bending direction at low pressures that shifts with increased pressure.
  • Validated bimodal behavior in both physical and numerical models.

Conclusions:

  • The bilinear material effectively enables bimodal deformation in SPAs.
  • The transition pressure can be tuned by adjusting the crimp ratio of the bilinear material.
  • This design offers enhanced control and adaptability for soft robotic applications.