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Related Concept Videos

Design Example: Frog Muscle Response01:14

Design Example: Frog Muscle Response

511
A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
When the switch connecting the RL circuit is closed, a brief muscle contraction is observed. This is because, at a steady state, the inductor acts like a short...
511

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Related Experiment Video

Updated: Dec 25, 2025

Cardiac Muscle-cell Based Actuator and Self-stabilizing Biorobot - PART 1
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Biologically inspired swimming robotic frog based on pneumatic soft actuators.

Fan Jizhuang1, Du Qilong1, Yu Qingguo1

  • 1State Key Laboratory of Robotics and System, Harbin Institute of Technology, People's Republic of China.

Bioinspiration & Biomimetics
|March 27, 2020
PubMed
Summary

This study presents a novel robotic frog capable of agile, untethered swimming using 12 pneumatic soft actuators. Mimicking natural frog paddling, this bionic robot demonstrates efficient locomotion and adaptability in aquatic environments.

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Area of Science:

  • Robotics
  • Bionics
  • Soft Actuators

Background:

  • Existing soft swimming robots lack flexible, efficient leg-based locomotion.
  • Mimicking natural locomotion is key for advanced robotic capabilities.

Purpose of the Study:

  • To develop a self-contained, untethered robotic frog with agile swimming abilities.
  • To utilize pneumatic soft actuators for efficient and compact leg design.

Main Methods:

  • Designed and integrated 12 pneumatic soft actuators for leg joints.
  • Performed kinematic analysis and gait planning based on natural frog paddling.
  • Controlled leg actuation through coordinated air pressure management.

Main Results:

  • The robotic frog achieved agile swimming, covering over 0.6 m per gait cycle (6s).
  • Demonstrated an average swimming velocity of 0.1 m/s and a minimum turning radius of 0.15 m.
  • Exhibited high environmental adaptability and efficient locomotion.

Conclusions:

  • Pneumatic soft actuators are suitable for amphibious bionic robots due to their speed, watertight design, and simplicity.
  • The developed robotic frog showcases potential for advanced underwater exploration and applications.
  • The biomimetic design enables efficient and adaptable aquatic locomotion.