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Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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An Octopus-Inspired Soft Pneumatic Robotic Arm.

Emmanouil Papadakis1, Dimitris P Tsakiris1, Michael Sfakiotakis2

  • 1Institute of Computer Science, Foundation for Research and Technology-Hellas, GR-70013 Heraklion, Greece.

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This study introduces an octopus-inspired soft robot arm with three segments capable of bending, extending, and twisting. Its compliant silicone design and pneumatic actuation enable delicate manipulation tasks.

Keywords:
arm twistingbio-inspired robotsbiomimeticspneumatic actuationrobot controlrobotic armsoft robotics

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Area of Science:

  • Robotics
  • Biomimetics
  • Materials Science

Background:

  • Octopus arms are highly agile biological manipulators.
  • Soft robots offer enhanced compliance for delicate interactions.
  • Existing soft robotic arms often lack multi-directional twisting capabilities.

Purpose of the Study:

  • To design, develop, and evaluate a novel soft robot arm inspired by octopus musculature.
  • To achieve multi-directional bending, extension, and twisting motions.
  • To demonstrate the potential for delicate manipulation in complex environments.

Main Methods:

  • Fabrication using two-part silicone molding in 3D-printed molds.
  • Pneumatic actuation of embedded chambers for segment deformation.
  • Model-free closed-loop control with real-time visual feedback for shape and tip pose reconstruction.

Main Results:

  • Successful development of a three-segment soft robot arm.
  • Demonstration of bending, extension, and twisting capabilities mimicking octopus arm functionality.
  • Experimental validation of control schemes for accurate arm shape and tip pose control.

Conclusions:

  • The developed soft robot arm effectively replicates octopus arm agility, including twisting.
  • The compliant silicone design is suitable for applications involving delicate object interaction.
  • The control methodology enables precise real-time manipulation, expanding soft robotics applications.