Abstract: An apparatus for damping acoustic waves that includes a volume of fluid having actively excited acoustic waves, an enclosure disposed in the volume of fluid including delimiting surfaces which define a cavity, at least one of the delimiting surfaces being permeable to the fluid, such that fluid may be exchanged between the cavity and the volume, and at least one sound producer disposed proximate the cavity to actively excite the actively excited acoustic waves in the fluid disposed in the cavity such that acoustic waves are damped in the volume.
Type:
Grant
Filed:
July 10, 2008
Date of Patent:
July 16, 2013
Assignee:
Deutsches Zentrum fur Luft-und Raumahrt E.V.
Inventors:
Stefan Busse, Claus Heuwinkel, Lars Enghardt, Ingo Röhle