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Birds use joint-driven wing morphing for flight adaptability. This study shows gull-inspired joint morphing offers UAVs adaptive longitudinal flight control, enhancing maneuverability and enabling multifunctional designs.

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Area of Science:

  • Biomimetics and Aerospace Engineering
  • Comparative Biomechanics
  • Aerodynamics

Background:

  • Birds dynamically adapt flight using joint-driven wing morphing for diverse aerial maneuvers.
  • Current unmanned aerial vehicle (UAV) wings primarily morph in a single plane, unlike avian non-planar wing shapes.
  • Avian joint-driven wing morphing offers a potential paradigm for advanced UAV control.

Purpose of the Study:

  • To investigate the aerodynamic benefits of joint-driven wing morphing for UAVs.
  • To quantify the longitudinal aerodynamic characteristics of gull-inspired wing-body configurations.
  • To explore how joint motion trajectories influence flight control strategies.

Main Methods:

  • Utilized the MachUpX numerical lifting-line algorithm to compute aerodynamic loads.
  • Validated aerodynamic models with wind tunnel tests on 3D-printed gull-wing models.
  • Analyzed aerodynamic forces and moments across various joint (elbow, wrist) configurations.

Main Results:

  • Joint-driven wing morphing effectively modulates lift, pitching moment, and static margin.
  • Specific joint motion trajectories enable distinct longitudinal flight control strategies, decoupling stability from lift/moment generation.
  • Musculoskeletal-inspired joint trajectories yielded the most significant aerodynamic property changes.

Conclusions:

  • Gull-inspired joint-driven wing morphing provides adaptive longitudinal flight control for UAVs.
  • This bio-inspired approach could lead to the development of multifunctional UAVs with enhanced agility.
  • Further research into specific joint trajectories can optimize UAV performance and adaptability.