Intrinsic stability of a body hovering in an oscillating airflow

We explore the stability of flapping flight in a model system that consists of a pyramid-shaped object hovering in a vertically oscillating airflow. Such a flyer not only generates sufficient aerodynamic force to keep aloft but also robustly maintains balance during free flight. Flow visualization r...

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Bibliographic Details
Published inPhysical review letters Vol. 108; no. 6; p. 068103
Main Authors Liu, Bin, Ristroph, Leif, Weathers, Annie, Childress, Stephen, Zhang, Jun
Format Journal Article
LanguageEnglish
Published United States 09.02.2012
Subjects
Animals
Biomimetics - methods
Flight, Animal
Insecta
Models, Biological
Models, Theoretical
Wings, Animal
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Summary:We explore the stability of flapping flight in a model system that consists of a pyramid-shaped object hovering in a vertically oscillating airflow. Such a flyer not only generates sufficient aerodynamic force to keep aloft but also robustly maintains balance during free flight. Flow visualization reveals that both weight support and orientational stability result from the periodic shedding of vortices. We explain these findings with a model of the flight dynamics, predict increasing stability for higher center of mass, and verify this counterintuitive fact by comparing top- and bottom-heavy flyers.
ISSN:1079-7114
DOI:10.1103/physrevlett.108.068103