The objective of this work was to acquire experimental data on atmospheric sound absorption and sideline noise propagation for the purpose of updating and refining aircraft noise measurement standards and improving aircraft noise prediction techniques. The effort involved acquisition of acoustical, meteorological, aircraft tracking, and aircraft operational data. The sound source was a Lockheed T-33A aircraft, propelled by a single Allison J33-A-35 turbojet engine, operating at constant thrust in level flight. Microphones were located near the ground in an array normal to the flight track. All tests were conducted at the Pendleton Municipal Airport, Pendleton, Oregon during two separate time periods in July and September 1970. (Author)
Experimental Atmospheric Absorption Coefficients
1971
76 pages
Report
Keine Angabe
Englisch
Noise Pollution & Control , Jet plane noise , Attenuation , Absorption , Meteorological parameters , Power spectra , Turbojet engines , Experimental data , Jet training planes , Oregon , Atmospheric attenuation , Acoustic absorption , Noise reduction , T-33 aircraft , T-33A aircraft , J-33 engines , J-33-A-35 engines