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Engineered Vascularized Muscle Flap
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Propulsion via flexible flapping in granular media.

Zhiwei Peng1, Yang Ding1, Kyle Pietrzyk2

  • 1Beijing Computational Science Research Center, Beijing 100193, China.

Physical Review. E
|January 20, 2018
PubMed
Summary

This study investigates how body flexibility impacts locomotion in granular media. Researchers found that optimal propulsion in granular environments is achieved with specific spring stiffness and large actuation, offering insights for synthetic locomotion systems.

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Area of Science:

  • Robotics and biomechanics
  • Granular physics
  • Locomotion dynamics

Background:

  • Biological locomotion often relies on body flexibility interacting with surrounding media.
  • Locomotion in granular media is less understood than in viscous fluids due to complex rheology.

Purpose of the Study:

  • To explore the influence of flexibility on granular propulsion.
  • To develop a mechanical model for understanding flexible body dynamics in granular media.

Main Methods:

  • A mechanical model with a rigid rod connected to a torsional spring was used.
  • Granular resistive force theory was applied.
  • Combined numerical and asymptotic investigations were performed.

Main Results:

  • Propulsive dynamics were characterized concerning actuation amplitude and spring stiffness.
  • Locomotion in granular media was compared to that in viscous fluids.
  • Maximum propulsive force was achieved with finite spring stiffness and large actuation amplitude.

Conclusions:

  • Flexibility plays a crucial role in granular propulsion.
  • The findings provide a basis for designing synthetic locomotive systems for terrestrial media.