Calculation procedures to describe airplane noise during takeoff and approach have been programmed for batch operation on a large digital computer. Three routines are included. The first normalizes far-field noise spectra to reference conditions and then determines spectra at various distances from the airplane, for airport elevations between sea level and 6000 feet and ambient temperatures between 30F and 100F. Overall sound pressure levels, A-weighted noise levels, perceived noise levels, and effective perceived noise levels are calculated. The second routine uses aerodynamic and engine thrust data to produce takeoff and approach flight path description. The basic takeoff is at equivalent airspeed, with thrust reduction or acceleration option after gear-up. The approach is along any constant glide slope between 3 and 6 degrees at constant airspeed, with a two-segment option. The last routine combines noise propagation and flight path information to produce constant noise contour footprints. The program has been exercised on Lockheed L-1011-1 Tristar/Rolls-Royce RB.211-22 data, providing results in EPNdB and dBA.
Commercial Aircraft Noise Definition - L1011 Tristar. Volume I
1974
85 pages
Report
Keine Angabe
Englisch
Air Transportation , Noise Pollution & Control , Commercial aircraft , Jet transport planes , Jet plane noise , Aircraft noise , Jet engine noise , Noise pollution , Acoustic signatures , Acoustic attenuation , Takeoff , Aircraft landings , Computer programming , Aerodynamic noise , Noise levels , L-1011 aircraft , DOT/4DZ/AA , DOT/5B
Emerald Group Publishing | 1979
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