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EuMoBot: replicating euglenoid movement in a soft robot.

Krishna Manaswi Digumarti1, Andrew T Conn2,3, Jonathan Rossiter2,4

  • 1Bristol Robotics Laboratory, University of Bristol, Bristol BS16 1QY, UK km.digumarti@bristol.ac.uk.

Journal of the Royal Society, Interface
|November 23, 2018
PubMed
Summary
This summary is machine-generated.

Inspired by Euglena, scientists created EuMoBot, a soft robot that mimics euglenoid movement through large body deformations. This biomimetic robot offers a new tool for studying locomotion and shape evolution in soft robots.

Keywords:
bioinspired roboticseuglenoid movementrobot locomotionshape characterizationsoft robotics

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Area of Science:

  • Robotics
  • Biomimetics
  • Fluid Dynamics

Background:

  • Organisms use diverse swimming strategies, with microorganisms requiring non-time-reversible shape changes for propulsion in viscous fluids.
  • Euglena utilize euglenoid movement, a unique locomotion involving large body deformations, to navigate viscous environments and small spaces.

Purpose of the Study:

  • To design and fabricate a multi-segment soft robot, EuMoBot, inspired by Euglena's euglenoid movement.
  • To investigate the potential of biomimetic soft robots with large shape-changing capabilities for locomotion and biological motion studies.
  • To develop a quantitative method for comparing robot and biological shapes.

Main Methods:

  • Fabrication of two EuMoBot prototypes of different sizes using fluid-filled elastomeric chambers.
  • Operation of robots with constant internal volume, exploiting hyperelasticity for locomotion.
  • Utilizing elliptic Fourier descriptors to quantitatively analyze and compare robot and Euglena shapes.

Main Results:

  • The smaller EuMoBot achieved a speed of 0.3 body lengths per cycle (20 mm min⁻¹), while the larger robot moved at 0.07 body lengths per cycle (4.5 mm min⁻¹).
  • A shape similarity of 85% was achieved between the robot and its biological counterpart.
  • Demonstrated the potential of shape-changing soft robots to replicate biological locomotion.

Conclusions:

  • EuMoBot successfully replicates euglenoid movement, showcasing the efficacy of large body deformations for locomotion in soft robots.
  • The developed quantitative shape analysis method is applicable to other nonlinear, dynamic soft robots.
  • Biomimetic robots can serve as valuable tools for understanding biological motion and evolutionary principles of shape.