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.
The Impact of Local Meteorological Conditions on Airframe Noise Flight Test Data
AIAA Aviation and Aeronautics Forum and Exposition ; 2018 ; Atlanta, GA, United States
2018-06-25
Conference paper
No indication
English
The Impact of Local Meteorological Conditions on Airframe Noise Flight Test Data (AIAA 2018-2971)
British Library Conference Proceedings | 2018
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