KOCHETOV'S SOUND-ABSORBING STRUCTURE Russian patent published in 2015 - IPC E04B1/84 

FIELD: machine building.

SUBSTANCE: in sound-absorbing structure with rigid and perforated walls a multilayer sound-absorbing element is located, it is made in form of five layers, two layers are sound-absorbing out of different density materials. Three central layers are combined, and the axial layer is made as sound-absorbing, and two symmetrically located layers are made from sound reflecting material of complex profile comprising uniformly distributed hollow tetrahedrons. As the sound-absorbing material the mineral wool basalt based plates Rockwool are used.

EFFECT: enhanced efficiency of sound absorption and reliability of the structure.

4 cl, 1 dwg