Active control of turbulent boundary layer noise transmission through an aeroelastic plate

Abstract

The reduction of sound transmission to the interior fuselage of modern jet aircraft is gaining increasing concern in an ever-competitive international market. In an attempt to identify effective, weight-saving noise control strategies, active control of sound transmission through elastic plates has received much attention in the literature. While many of these investigations have demonstrated promising results, none of them have considered the effects on plate dynamics by convected fluid loading. Past investigations into the effects of convected fluid loading on plates (i.e., aeroelasticity) have demonstrated significant effects on plate response in the high subsonic and supersonic Mach number range. This is the typical operating range for current and future commercial aircraft. The objective of this investigation is to demonstrate the effectiveness of active control on the transmission of turbulent boundary layer noise through an aeroelastic plate and to highlight the importance of including convected fluid loading in the model. Development of a fully coupled model will be presented for a plate subjected to convected fluid loading on one side and acoustic loading on the other will be presented. Finally, the effectiveness of active control employing co-located piezoelectric transducers on the plate will be presented.