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Optimal pitching axis location of flapping wings for efficient hovering flight.

Q Wang1, J F L Goosen, F van Keulen

  • 1Author to whom any correspondence should be addressed.

Bioinspiration & Biomimetics
|June 21, 2017
PubMed
Summary

Finding the optimal pitching axis for flapping wings significantly improves hovering flight efficiency. This research reveals an ideal axis location, reducing power consumption by up to 33% for flapping wing micro air vehicles.

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Area of Science:

  • Aerospace Engineering
  • Bio-inspired Engineering
  • Fluid Dynamics

Background:

  • Passive pitching of flapping wings is influenced by flexibility, inertia, and aerodynamic loads.
  • The pitching axis location critically affects aerodynamic loads, passive pitching motion, and overall flight efficiency.
  • Optimizing the pitching axis is crucial for maximizing power efficiency in flapping wing micro air vehicles (FWMAVs) during hovering flight.

Purpose of the Study:

  • To investigate the optimal pitching axis location for flapping wings to minimize power consumption during hovering flight.
  • To analyze the impact of pitching axis location on aerodynamic performance and energy efficiency.
  • To compare the efficiency of optimized wings with traditional designs.

Main Methods:

  • Flapping wings were modeled as rigid plates with non-uniform mass distribution and root flexibility via a torsional spring.
  • A predictive quasi-steady aerodynamic model was employed to calculate lift.
  • Two power consumption scenarios were simulated: with and without kinetic energy recovery systems.

Main Results:

  • The optimal pitching axis was identified between the leading edge and the mid-chord line, similar to insect wings.
  • Optimized pitching axes reduced hovering flight power consumption by up to 33% compared to traditional designs (leading edge axis).
  • Optimized wings exhibited increased pitching amplitudes, advanced pitching reversals, higher lift-to-drag ratios, and enhanced energy recovery potential.

Conclusions:

  • The wing pitching axis location is a critical parameter for achieving energy-efficient FWMAVs.
  • Optimized pitching axes lead to significant power savings and improved aerodynamic performance, especially when coupled with kinetic energy recovery systems.
  • The findings provide valuable insights for the design of next-generation bio-inspired flying devices.