Document Detail

Aeroelastic flutter produces hummingbird feather songs.
MedLine Citation:
PMID:  21903810     Owner:  NLM     Status:  In-Process    
During courtship flights, males of some hummingbird species produce diverse sounds with tail feathers of varying shapes. We show that these sounds are produced by air flowing past a feather, causing it to aeroelastically flutter and generate flutter-induced sound. Scanning laser doppler vibrometery and high-speed video of individual feathers of different sizes and shapes in a wind tunnel revealed multiple vibratory modes that produce a range of acoustic frequencies and harmonic structures. Neighboring feathers can be aerodynamically coupled and flutter either at the same frequency, resulting in sympathetic vibrations that increase loudness, or at different frequencies, resulting in audible interaction frequencies. Aeroelastic flutter is intrinsic to stiff airfoils such as feathers and thus explains tonal sounds that are common in bird flight.
Christopher J Clark; Damian O Elias; Richard O Prum
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  333     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-09-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1430-3     Citation Subset:  IM    
Department of Ecology and Evolutionary Biology, Post Office Box 208105, Yale University, New Haven, CT 06520, USA.
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