RESONANT ACOUSTIC ABSORBER Russian patent published in 2008 - IPC E04B1/84 

FIELD: construction, superstructures.

SUBSTANCE: principle applies to production acoustics, in particular wideband silencing, and can be used in all sectors of national economy in silencing production machinery using the method of noise absorption. The technical result is to ensure the effectiveness of noise absorption on account of increasing the frequency diapason and improving operational characteristics. Resonant acoustic absorber consists of firm frame, suspended on the ceiling of the production building, and has a sound absorbing material in the frame. The frame is made in the form of a bowl. The side surface of the bowl, the bottom and lid, to which the fastening element, that fasten the facility to the ceiling of the production building, is connected, is in the form of a perforated cable segment. In the frame, there's a central rod, firmly connected onto the bowl's bottom axis, on which on the full height of the central rod, at least, one internal partition is fixed. This internal partition forms with another or the other partitions, roof or bottom of the resonant cavity bowl. At least, in one of the partitions, there's a sound absorbing material, wrapped in acoustic transparent material. Perforation is done by slotting. The perforation coefficient of the side surface, bottom, frame lid and also the internal partition is the same and equal or greater than 0.3. The side surface of the perforated bowl in the section perpendicular to the bowl axis, has circular, elliptic, triangular or polygonal form.

EFFECT: increasing the silencing effectiveness.

2 cl, 1 dwg