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Design and Joint Position Control of Bionic Jumping Leg Driven by Pneumatic Artificial Muscles.

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Summary

Researchers designed a bionic jumping leg inspired by kangaroos, using pneumatic artificial muscles (PAMs) and advanced control for improved motion and performance. This robotic leg achieved significant horizontal and vertical jumps in experiments.

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active disturbance rejection controlbionic leg jumpingdecoupling controlposition control

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Area of Science:

  • Robotics
  • Biomechanics
  • Artificial Muscles

Background:

  • Kangaroo hind limb biomechanics provide a model for efficient locomotion.
  • Pneumatic artificial muscles (PAMs) offer potential for biomimetic actuation.

Purpose of the Study:

  • To design and control a bionic jumping leg inspired by kangaroo hind limbs.
  • To overcome joint rotation limitations and improve range of motion using PAMs.
  • To implement advanced control strategies for decoupled joint movement.

Main Methods:

  • Biomimetic design incorporating biarticular and monoarticular muscle arrangements.
  • Dynamic modeling using the Lagrange method and PAM output force models.
  • Decoupling of coupled systems using an extended state observer.
  • Angle tracking control via active disturbance rejection control (ADRC).

Main Results:

  • Improved range of motion in the bionic joint by addressing PAM shrinkage limitations.
  • Successful decoupling of the bionic leg system into two single-input, single-output systems.
  • ADRC demonstrated superior decoupling and faster response compared to PID control.
  • Experimental validation showed the bionic leg achieved 320 mm horizontal and 150 mm vertical displacement.

Conclusions:

  • The kangaroo-inspired bionic leg effectively replicates natural jumping mechanics.
  • ADRC provides a robust control solution for complex, coupled robotic systems like the bionic leg.
  • The developed bionic leg shows promise for applications requiring agile, powerful locomotion.