NOISE ABSORBING PANEL Russian patent published in 2018 - IPC E04B1/82 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics. Technical result is achieved by the fact that the noise absorbing panel comprises a frame and a noise absorbing insert, located in its internal cavity, frame is made in the form of a rectangular parallelepiped formed by a perforated front and a solid rear wall of the panel, each of which is U-shaped, with lateral ribs, wherein on the front wall there is slot perforation 7 and 8 made in the form of rectangles and arranged in rows, while width of rows b₁ and b₂ and distance between them h₁ and h₂, wherein the adjacent rows are arranged with an offset, and the number of slots in one row is even, and in the other - odd, perforation ratio is assumed to be equal to or greater than 0.25, and the panel walls are fixed to each other by shock-absorbing caps that are U-shaped with cells filled with shock-absorbing mastic for connecting the panels when facing the walls of buildings and manufacturing acoustic screens. Noise absorbing insert is made in the form of a solid rigid wall made of rigid shock-absorbing material, such as "Agate", "Shvim" and a perforated wall of a mesh polymer material, for example, kapron, and between them there is a two-layer combined sound-absorbing element, the layer adjacent to the rigid wall is sound-absorbing, and the layer, adjacent to the perforated wall, is made of a perforated sound-reflecting material of a complex profile, consisting of uniformly distributed hollow tetrahedra, allowing to reflect the sound waves falling in all directions.

EFFECT: technical result is increased efficiency of noise absorbing due to wider frequency range, simplification and versatility of installation and improved operational properties due to the use of perspective sound-absorbing and protective-decorative materials.

1 cl, 2 dwg