Turbulent boundary layer induced noise and vibration of a multi-panel walled acoustic enclosure

Joana Da Rocha, Afzal Suleman, Fernando Lau

Abstract


Flow-induced noise in aircraft cabins can be predicted through analytical models or numerical methods. To date, analytical methods have been used for simple structures and cabins, where usually a single panel is vibrating due to the flow excitation, and coupled with an acoustic enclosure. The present work investigates the analytical prediction of turbulent boundary layer induced noise and vibration of a multi-panel system. The objective is to investigate the coupling between individual panels and the acoustic enclosure. Each panel is coupled with the acoustic enclosure, which consists of a large rectangular room, with five rigid walls and one flexible wall. The properties of the panels and acoustic enclosure represent a typical fuselage skin panel and a cabin section, respectively. It is shown that identical panels located at different positions have dissimilar contributions to the cabin interior noise, showing that the panel position is an important variable for the accurate prediction and suppression of cabin noise. Analytical predictions were obtained for both the space-averaged interior sound pressure level and local interior sound pressure level. The space-averaged sound pressure level is usually accepted to provide the necessary information for the noise prediction; however, in some real life applications, the local sound pressure may also be desirable.

Keywords


Acoustic noise measurement; Acoustic wave transmission; Acoustics; Enclosures; Accurate prediction; Acoustic enclosure; Analytical method; Analytical predictions; Cabin interior; Cabin noise; Flexible wall; Induced noise; Noise predictions; Real-life applications; Rigid wall; Simple structures; Sound pressure level; Sound pressures; Turbulent boundary layers

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