Propulsion airframe aeroacoustics practices at Honeywell

Honeywell has been developing and applying acoustic models of propulsion airframe aeroacoustic phenomena for over 20 years. The initial application of a wing-shielding model was developed for the NASA General Aviation Synthesis Program in 1982. Since that time, more sophisticated models of wing shielding and reflection have been developed with internal and NASA funding. Recent work has involved models of wing shielding for aft mounted engines and wing reflection for wing mounted engines. These methods are described in the presentation. Comparisons with the Raynoise Code by LMS and measured aircraft fly over noise data are made to show the effectiveness of the model. The attenuation of the inlet noise by the wing of an aft mounted engine and the amplification of the noise by wing mounted engines are evaluated.