Abstract: Acoustic enclosures such as aircraft cabins often display lightly damped modal behavior at low frequencies where passive treatments are impractical due to mass and volume constraints. This work ...

Abstract: Helmholtz resonators are used in a variety of applications to reduce the transmission of unwanted sound. This work demonstrates that mechanically coupled resonators can be used to design a ...

Abstract: This paper documents a recent R&D effort conducted by the Air Force Research Laboratory, Space Vehicles Directorate, to assess the feasibility of fabricating large composite launch vehicle ...

Abstract: The noise transmission behavior of an advanced grid-stiffened (AGS) composite structure has been investigated by combining numerical and experimental methods. Structural-acoustic coupling was found ...

Abstract: This work presents and demonstrates a passive isolation system that offers the performance of a skyhook damper, but without the need of an inertial reference. This “virtual skyhook” isolation ...