The Experimental Determination of Atmospheric Absorption from Aircraft Acoustic Flight Tests

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National Aeronautics and Space Administration, 1971 - Airplanes - 105 pages

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Contents

SUMMARY
1
TEST PROCEDURES AND INSTRUMENTATION
10
Errors in Meteorological Measurements
20

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1/3-OCT FREQ BAND 1/3-OCTAVE FREQUENCY BAND 115 DEGREES SOLID 24 26 PREFERRED 26 PREFERRED 1/3-OCTAVE 85 DEGREES 866 Absorption Coefficients accuracy acoustic data ACOUSTIC FLIGHT TEST acoustic tests airplane altitude ARP 866 Absorption BAND NUMBER Figure BOEING QUIET NACELLE calculated climb angle Coefficients for Test Composite Plots computed DEGREES 105 DEGREES DEGREES 25 DEGREES 30 DEGREES SOLID LINE DIRECTIVITY ANGLE DEG distance dynamic range effects Experimental and ARP flightpath FREQ BAND 75 FREQUENCY BAND NUMBER Grant County Airport LINE IS MEAN meteorological measurements microphone grid Microphone height Microphones for Test Moses Lake NASA QUIET NACELLE noise floor number of microphones October 22 overhead Pa(i Plot of Differences PREFERRED 1/3-OCTAVE FREQUENCY QUIET NACELLE STUDY radar radiosonde regression line relative humidity runway series 15 sideline microphones slope Summary Plot surface temperature and humidity Test Condition test series values wind speeds ما ها

Bibliographic information

TitleThe Experimental Determination of Atmospheric Absorption from Aircraft Acoustic Flight Tests
NASA contractor report
AuthorsR. L. Miller, P. B. Oncley
ContributorsBoeing Company, Langley Research Center, United States. National Aeronautics and Space Administration
PublisherNational Aeronautics and Space Administration, 1971
Original fromNational Aeronautics and Space Administration (NASA)
DigitizedMay 4, 2010
Length105 pages
  
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