SOUND ABSORBING ELEMENT Russian patent published in 2018 - IPC E04B1/84 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics. Sound-absorbing element is made in the form of the rigid and perforated walls, between which the multilayer sound-absorbing element is located, the multi-layer sound-absorbing element is made in the form of two layers, one of which, adjacent to the rigid wall, is sound-absorbing, and the other one, adjacent to the perforated wall, is made of the sound-reflecting material of a complex profile, which consists of uniformly distributed hollow tetrahedra that allow to reflect the sound waves, which fall in all directions. Between the perforated wall and the layer made of the sound reflecting material of a complex profile, which consists of uniformly distributed hollow tetrahedra, the layer of sound-absorbing material with the density lower than the density of the sound-absorbing layer adjacent to the rigid wall, and the layer of the sound-reflecting material of the complex profile with perforation are located.

EFFECT: technical result consists in increased efficiency of acoustic suppression and of the reliability of the structure as a whole.

1 cl, 1 dwg