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The Impact of Local Meteorological Conditions on Airframe Noise Flight Test Data Phased microphone array measurements obtained during flight tests conducted in 2016 and 2017 are used to assess the importance of local meteorological measurements on the data. In particular, the effectiveness of atmospheric absorption corrections is evaluated under vastly different temperature and humidity conditions. The results indicate that, even under conditions with high absorption, sources can be visualized up to a frequency that is dependent on background noise levels, wind, and atmospheric turbulence. However, absolute levels were found to be problematic on days with high absorption rates, with the discrepancies most prevalent for aircraft positions further from the center of the array. Restricting the data to those days with favorable meteorological conditions generally resulted in a good collapse of the spectra, with differences less than a couple of decibels.
Document ID
20190001863
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Lockard, David P.
(NASA Langley Research Center Hampton, VA, United States)
Bestul, Kimberly A.
(Jacobs Technology, Inc. Moffett Field, CA, United States)
Date Acquired
March 26, 2019
Publication Date
June 25, 2018
Subject Category
Acoustics
Report/Patent Number
NF1676L-28775
Meeting Information
Meeting: AIAA Aviation and Aeronautics Forum and Exposition
Location: Atlanta, GA
Country: United States
Start Date: June 25, 2018
End Date: June 29, 2018
Sponsors: American Institute of Aeronautics and Astronautics (AIAA)
Funding Number(s)
WBS: WBS 107210.02.01.07
Distribution Limits
Public
Copyright
Public Use Permitted.
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