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Flexible flapping wings with self-organized microwrinkles.

Hiroto Tanaka1, Hiroyuki Okada, Yosuke Shimasue

  • 1Shanghai Jiao Tong University and Chiba University International Cooperative Research Center, Chiba University, Japan.

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Summary

Researchers developed bio-inspired wrinkled flapping wings for micro aerial robots. These wings offer tunable stiffness, preventing flutter and increasing lift for enhanced aerodynamic performance.

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Area of Science:

  • Robotics
  • Materials Science
  • Aerodynamics

Background:

  • Micro aerial robots require efficient and controllable flapping wings.
  • Existing flexible wing designs have limitations in stiffness control and aerodynamic performance.

Purpose of the Study:

  • To design and fabricate bio-inspired flapping wings with tunable stiffness using microscale wrinkles.
  • To investigate the effect of wrinkle patterns on wing mechanical properties and aerodynamic performance.

Main Methods:

  • Fabrication of wrinkled wing membranes using a self-organization phenomenon and Parylene deposition.
  • Theoretical, computational, and experimental analysis of wrinkle waveform effects on film stiffness.
  • Testing of fabricated wrinkled wings on a tethered electric flapping mechanism.

Main Results:

  • Wrinkled films exhibited a two-order-of-magnitude increase in flexural stiffness and a two-order-of-magnitude decrease in tensile stiffness compared to flat films.
  • Chordwise unidirectional wrinkles prevented trailing-edge flutter and generated greater aerodynamic lift.
  • Spanwise wrinkles did not offer the same aerodynamic benefits as unidirectional wrinkles.

Conclusions:

  • Microscale wrinkles provide a method for fine-tuning wing film stiffness, crucial for micro aerial robots.
  • Wrinkled wing designs can significantly improve aerodynamic efficiency and stability in flapping-wing systems.
  • This approach expands the design possibilities for flexible wings in bio-inspired aerial robotics.