Oblique incidence sound absorption of porous materials covered by perforated metal and exposed to tangential airflowThe purpose of this study was to evaluate several acoustic linings that are candidate designs for the Ames 40- by 80-Foot Wind Tunnel test section. The acoustic treatment will be used to reduce wall reflections from aircraft model noise sources. The goal is not simply to attenuate sound propagating down the duct, but rather to create a semi-anechoic space in a windy environment by absorbing at least 80% of the incident acoustic energy over a wide frequency range, if possible.
Document ID
19950071311
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Soderman, Paul T. (NASA Ames Research Center Moffett Field, CA, US, United States)