How hummingbirds hum: acoustic holography of hummingbirds during maneuvering flight

B. Hightower, P.W.A. Wijnings, R. Ingersoll, D. Chin, R. Scholte, D. Lentink

Onderzoeksoutput: Bijdrage aan congresAbstractAcademic

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Samenvatting

Hummingbirds make a characteristic humming sound when they flap
their wings. The physics and the biological significance of hummingbird aeroacoustics is still poorly understood. We used acoustic holography and high-speed cameras to determine the acoustic field of six hummingbirds while they either hovered stationary in front of a flower or maneuvered to track flower motion. We used a robotic flower that oscillated either laterally or longitudinally with a linear combination of 20 different frequencies between 0.2 and 20 Hz, a range that encompasses natural flower vibration frequencies in wind. We used high-speed marker tracking to dissect the transfer function between the moving flower, the head, and body of the bird. We also positioned four acoustic arrays equipped with 2176 microphones total above, below, and in front of the hummingbird. Acoustic data from the microphones were back-propagated to planes adjacent to the hummingbird to create the first real-time holograms of the pressure field a hummingbird generates in vivo. Integration of all this data offers insight into how hummingbirds modulate the acoustic field during hovering and maneuvering flight.
Originele taal-2Engels
Pagina'sG8.00010
Aantal pagina's1
StatusGepubliceerd - 2017
Evenement70th Annual Meeting of the APS Division of Fluid Dynamics (DFD 2017), November 19-21, 2017, Denver, Colorado, USA - Colorado Convention Center, Denver, Verenigde Staten van Amerika
Duur: 19 nov 201721 nov 2017
http://www.apsdfd2017.org/

Congres

Congres70th Annual Meeting of the APS Division of Fluid Dynamics (DFD 2017), November 19-21, 2017, Denver, Colorado, USA
Verkorte titelDFD 2017
LandVerenigde Staten van Amerika
StadDenver
Periode19/11/1721/11/17
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