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Area of Science:

  • Robotics
  • Materials Science

Background:

  • Continuum robots offer high dexterity and conformability but require improved safety through controlled stiffness.
  • Controlling continuum robot stiffness is a key research challenge for enhanced environmental interaction.

Purpose of the Study:

  • To develop and evaluate a tubular stiffening sheath for small-diameter continuum robots.
  • To compare granular and layer jamming techniques for stiffness enhancement.
  • To investigate material properties influencing sheath stiffness and robot performance.

Main Methods:

  • Assessed granular and layer jamming stiffening modalities.
  • Provided material selection criteria based on performance and stiffness.
  • Conducted experimental stiffness measurements under lateral and axial forces.
  • Integrated a layer jamming sheath onto a miniaturized continuum robot.

Main Results:

  • Layer jamming demonstrated superior stiffness enhancement compared to granular jamming.
  • Sheath stiffness was empirically correlated with material parameters beyond surface roughness.
  • The miniaturized layer jamming sheath increased the continuum robot's stiffness by up to 24 times.
  • Stiffness improvements were validated under various external force conditions.

Conclusions:

  • Tubular stiffening sheaths offer a viable method to temporarily increase continuum robot stiffness.
  • Layer jamming presents a promising modality for significant stiffness augmentation in continuum robots.
  • The developed sheath technology enhances the safety and applicability of continuum robots in complex environments.