Experimental Atmospheric Absorption Coefficients.
Final rept. Jun 70-Nov 71,
HYDROSPACE RESEARCH CORP SAN DIEGO CALIF SAN DIEGO DIV
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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