An analytical model of the structural acoustic behaviour of a propeller aircraft including vibration absorbers attached to the fuselage has been developed. The model was then used to study the potential of vibration absorbers for reducing interior noise. The results demonstrate than when the absorbers are correctly configured, attenuation of 6-10 dB in the total interior acoustic energy density are possible. The model also demonstrated that globally detuning the absorbers to minimize an interior acoustic cost function gives improved attenuation over tuned absorbers. Further analysis indicated that the attenuations are relatively insensitive to small changes in the disturbance frequency at the blade passage frequency. The importance of the positioning of the absorbers is also shown.
Control of aircraft interior noise using globally detuned vibration absorbers
Begrenzung des Geräusches im Flugzeuginneren mit global verstimmten Schwingungsdämpfern
1995
10 Seiten, 9 Bilder, 5 Tabellen, 15 Quellen
Conference paper
English
Control of aircraft interior noise using globally detuned vibration absorbers
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