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Spinal Helical Actuation Patterns for Locomotion in Soft Robots.

Jennifer C Case1, James Gibert2, Joran Booth3

  • 1School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907 USA; School of Engineering & Applied Science, Yale University, New Haven, CT 06520 USA; Intelligent Systems Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 USA.

IEEE Robotics and Automation Letters
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Summary
This summary is machine-generated.

Researchers explored spinal-driven locomotion in robots using axial torsion. Modifying spine stiffness and leg positioning influenced robot speed and turning capabilities, suggesting new robotic movement possibilities.

Keywords:
Soft robot materials and designbiologically-inspired robotslegged robots

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Area of Science:

  • Robotics
  • Biomechanics
  • Locomotion

Background:

  • Spinal-driven locomotion, hypothesized in biological systems since the 1980s, is a recent focus in legged robotics.
  • Current robotic implementations primarily utilize spinal bending, neglecting other modes of spinal actuation.

Purpose of the Study:

  • To introduce and investigate axial torsion via helical actuation patterns as a novel mode of spinal-driven locomotion in robots.
  • To develop and test a modular, six-legged robot capable of torsional locomotion.

Main Methods:

  • Designed and constructed a modular, six-legged robot with an elastomeric spine featuring spiraling actuators.
  • Developed a mathematical model to explain the mechanics of torsional spinal-driven locomotion.
  • Implemented three distinct spinal gaits to control forward movement, turning, and speed.

Main Results:

  • Demonstrated that robot speed is significantly influenced by the stiffness of the spine and legs.
  • Showcased the ability to achieve forward motion and turning (left/right) using a single gait by adjusting leg positions or foot friction.
  • Confirmed that helical actuation patterns enhance robotic movement.

Conclusions:

  • Axial torsion represents a viable and effective mode for spinal-driven locomotion in legged robots.
  • The integration of active axial torsion and helical actuation patterns in future robots could improve energy efficiency and enable dynamic maneuvering.