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Building an Enhanced Flight Mill for the Study of Tethered Insect Flight
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Passive dynamics regulates aperiodic transitions in flapping wing systems.

Dipanjan Majumdar1, Sridhar Ravi2, Sunetra Sarkar1

  • 1Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai, 600036 Tamil Nadu, India.

PNAS Nexus
|April 6, 2023
PubMed
Summary

Passive pitching in flapping wing systems prevents chaotic dynamics, even at high speeds. This passive motion regularizes aerodynamic loads, offering stable flight solutions for artificial flyers.

Keywords:
delaying chaotic transitionflapping foilfluid–structure interactiongusty inflowpassive pitching

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Area of Science:

  • Fluid dynamics
  • Aerodynamics
  • Biomechanics of flight

Background:

  • Flapping wing flight systems often exhibit chaotic dynamics at high velocities.
  • Previous studies indicate chaotic transition in canonical flapping foil models.
  • Understanding and controlling these dynamics is crucial for stable flight.

Purpose of the Study:

  • To investigate the effect of passive pitching on the fluid forces and dynamics of a flapping foil.
  • To compare the performance of a passively pitching foil with a fully actuated foil.
  • To determine if passive pitching can prevent chaotic transitions.

Main Methods:

  • Numerical investigation of an idealized pitching-plunging flapping foil.
  • Comparison with a fully actuated flapping wing model.
  • Analysis of fluid forces and dynamical states under varying conditions.

Main Results:

  • Passive pitching successfully averted aperiodic (chaotic) transitions, even at high plunge velocities.
  • Passive oscillations reduced the strength of leading-edge vortices (LEVs) and flow separation.
  • Passive pitching attenuated fluid loads, enhancing gust mitigation capabilities.

Conclusions:

  • Passive pitching dynamics are beneficial for regularizing aerodynamic loads in flapping wing systems.
  • Allowing passive pitching offers a viable solution for stabilizing artificial flying platforms.
  • This approach can prevent chaotic transitions and improve flight performance.