Abstract: An acoustic absorption blanket mounting system includes a blanket mounting strip (BMS) attached to a fastener strip mounted to an airframe member. The BMS is generally of a shape to removably capture a sound proofing blanket between opposed pair of wings. At least one wing of the pair of wings includes an acoustic gasket strip sewn to the BMS base material layer. Opposed blanket hook and loop strips correspond to wing hook and loop strips such that a soundproofing blanket is retained between the wings such that the acoustic gasket strip minimizes acoustic leakage heretofore experienced in soundproofing blanket attachments.

Abstract: An acoustic absorption system fills each frame void within an airframe section with a close fitting foam portion. A mass barrier layer is adhered over the foam portions and to a multitude of frame members. The mass barrier layer is a contiguous layer adhered across the multitude of frame members to seal the airframe frame voids to make use of mass-air-mass principles to reduce flanking path leakage around the foam portions.

Abstract: An acoustic absorption trim panel includes a composite core, a decoupler layer, and a mass barrier layer. By ensuring that the mass barrier layer remains limp in a limp area but in contact with the composite core through the decoupling layer, damping greater than that imparted in conventional construction is achieved.

Abstract: A structural damping assembly includes a bonding plate, a stiffener layer, an elastomeric layer, and a constraining layer. The elastomeric layer is boned between the stiffener layer and the constraining layer. The bonding plate and the stiffener layer extend between, and are preferably in contact with, webs which form a pocket on a substrate such as a transmission support beam. The structural damping assembly uses the energy dissipating properties of the elastomeric layer that is sandwiched between the vibrating stiffener layer and the constraining layer to combat noise due to resonant response while operating as a stiffener that increases the frequency of resonance to a range where coincidental placement with an excitation frequency is reduced.