Actively tunable lightweight acoustic barrier materials
In one embodiment, provided is an actively tunable acoustic attenuator having a frame, a membrane within the frame, and a mass secured to the membrane. In another embodiment, provided is an actively tunable acoustic attenuator having a frame, a membrane within the frame, and a mass secured to the membrane. The membrane is coupled, either indirectly or directly, to the frame via a variable stiffness coupler. In another embodiment, provided is an actively tunable acoustic attenuator having a frame and a plurality of membrane layers within the frame. An active material is between at least two of the plurality of membrane layers. A mass is secured to at least one of the plurality of membrane layers.
HRL Laboratories, LLC
G B G G
G10K B60R G10K G10K
inventional inventional inventional inventional
Geoffrey P. Christopher P. Chia-Ming Andrew C.
McKnight Henry Chang Keefe