Supplementary Electronic Materials: The role of passive avian head stabilization in flapping flight
- Birds improve vision by stabilizing head position with respect to the body, which is forced up and down during flapping flight. Stabilization is facilitated by compensatory motion of the sophisticated avian head-neck system. While relative head motion has been studied in stationary and walking birds, little is known about how birds accomplish head stabilization during flapping flight. To unravel this, we approximate the avian neck with a linear mass-spring-damper system for vertical displacements, analogous to proven head stabilization models for walking humans. We corroborated the model’s dimensionless natural frequency and damping ratios from high-speed video recordings of Whooper Swans (Cygnus cygnus) flying over a lake. The data show that flap-induced body oscillations can be passively attenuated through the neck by tuning neck stiffness and damping at time scales much slower than the wingbeat. We found that the passive model robustly attenuates large body oscillations, even in response to head mass and gust perturbations. Our proof of principle demonstrates that bio-inspired drones with flapping wings will record better images with a swan-inspired passive camera suspension.
|Type of resource
|March 20, 2015
|Department of Mechanical Engineering Stanford University
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- Preferred Citation
- Pete, Ashley and Kress, Daniel and Dimitrov, Marina and Lentink, David. (2014-2015). Supplementary Electronic Materials: The role of passive avian head stabilization in flapping flight. Stanford Digital Repository. Available at: http://purl.stanford.edu/pw311wn7849
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