Date of Award
Summer 2011
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical & Aerospace Engineering
Program/Concentration
Aerospace Engineering
Committee Director
Colin P. Britcher
Committee Member
Drew Landman
Committee Member
Thomas Alberts
Call Number for Print
Special Collections; LD4331.E535 C75 2011
Abstract
Aero-acoustic testing is used to identify and characterize acoustic sources of test articles within a flow field. Such testing requires high signal-to-background noise level ratios (5 - 10 dB) and an anechoic test chamber. The NASA Langley 14 x 22 ft Subsonic Wind Tunnel is evaluated with respect to operating noise levels and to architectural acoustic characteristics. Operating noise level measurements include power spectral densities, 1/3 octave plots, and overall sound pressure levels. Architectural acoustic measurements are centered around reverberation analysis. A lumped parameter model, based on a technique applied in architectural acoustics to study noise propagation between connected rooms, is developed to predict acoustic intensity ratios in specific locations around the wind tunnel circuit. The model is used to predict the impact of applying acoustic treatment to the surfaces within the wind tunnel. Recommendations are made for the best distribution of such treatment based on the lumped parameter analysis and a survey of state-of-the-art aero-acoustic wind tunnels.
Rights
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DOI
10.25777/eb2m-t758
Recommended Citation
Crippen, James T..
"Acoustic Characterization of the NASA Langley 14 X 22 Ft Subsonic Wind Tunnel"
(2011). Master of Science (MS), Thesis, Mechanical & Aerospace Engineering, Old Dominion University, DOI: 10.25777/eb2m-t758
https://digitalcommons.odu.edu/mae_etds/452