SOUND-ABSORBING ELEMENT Russian patent published in 2015 - IPC E04B1/84 

FIELD: construction.

SUBSTANCE: sound-absorbing element includes perforated surfaces, between which a sound-absorbing structure is arranged and consists of three layers of sound-absorbing material. The first layer, which is a stiffer one, is solid and shaped and fixed on upper perforated surface. The second layer, which is a softer one than the first layer is discontinuous and located in focus of sound reflecting surfaces of the first layer. The discontinuous sound absorbing layer located in focus of a solid shaped layer is made in the form of rotation bodies, for example in the form of balls, and attached by means of rods parallel to upper and lower perforated surfaces, which are rigidly attached to the upper perforated surface by means of vertical fasteners perpendicular to them, for example in the form of plates, one end of which is rigidly fixed on the upper perforated surface, and the other one is made in the form of a clamp enveloping the rod and tightening it by means of a screw.

EFFECT: improving noise control efficiency and reliability of the structure as a whole.

5 cl, 1 dwg