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Robotic vertical jumping agility via series-elastic power modulation.

Duncan W Haldane1, M M Plecnik2, J K Yim2

  • 1Department of Mechanical Engineering, University of California at Berkeley, CA 94720, USA. dhaldane@berkeley.edu.

Science Robotics
|November 7, 2020
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Summary

This study introduces vertical jumping agility, a metric for arboreal mammals. A novel robot design utilizing series-elastic power modulation achieved 78% of galago agility, enabling advanced locomotion like wall jumps.

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Area of Science:

  • Biomechanics
  • Robotics
  • Animal Locomotion

Background:

  • Arboreal mammals exhibit remarkable vertical jumping agility, reaching heights up to 2 meters.
  • This performance is fundamentally limited by actuator power and force control during stance.
  • The galago (Galago senegalensis) demonstrates superior vertical jumping agility through a power-modulating strategy.

Purpose of the Study:

  • To characterize vertical jumping agility in arboreal mammals using kinetic relations.
  • To investigate the role of series-elastic power modulation in enhancing robotic jumping performance.
  • To develop a robot capable of achieving high vertical jumping agility comparable to mammals.

Main Methods:

  • Analysis of basic kinetic relations to define vertical jumping agility and its constraints.
  • Development of a jumping robot incorporating a specialized leg mechanism for enhanced power modulation.
  • Comparison of the robot's vertical jumping agility with that of the galago.

Main Results:

  • Vertical jumping agility is fundamentally constrained by available actuator power.
  • Previous robots achieved only 55% of galago vertical jumping agility due to motor power limits.
  • The novel robot achieved 78% of galago vertical jumping agility, surpassing previous robotic capabilities.
  • The robot successfully demonstrated a wall jump, reaching a greater net height than a single jump.

Conclusions:

  • Series-elastic power modulation is a key actuation strategy for achieving high vertical jumping agility in robots.
  • Agile robots can explore novel locomotion methods, such as wall jumping.
  • This research paves the way for a new class of vertically agile robots inspired by biological systems.