CONTROL OF AIRCRAFT INTERIOR NOISE USING GLOBALLY DETUNED VIBRATION ABSORBERS

Abstract A simplified analytical structural acoustics model of a propeller aircraft is developed to study the potential of mechanical vibration absorbers for reducing interior noise. The results show that globally detuning the absorbers to minimize an interior acoustic cost function gives attenuations of the order of 6–10 dB of the blade passage frequency interior noise when properly configured. The analysis also predicts that globally detuned absorbers consistently outperform tuned absorbers in which the base motion is directly minimized.