KOCHETOV SOUND-ABSORBING LINING 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 sound-absorbing lining is made in the form of a rigid and perforated walls, between which the multilayer sound absorbing element is located, wherein the multi-layer sound-absorbing element is made in the form of two layers, one of which, adjacent to rigid wall, is sound-absorbing, and the other, adjacent to the perforated wall, is made of a complex shaped sound-reflecting material, consisting of uniformly distributed hollow tetrahedrons, which allow to reflect sound waves incident in all directions, each of perforated walls has following perforation parameters: holes diameter - 37÷mm, perforation percentage 10%÷15%, wherein by form holes can be of circular, triangular, square, rectangular or rhomboid shape, wherein in case of non-circular holes, maximum diameter of circle inscribed into polygon shall be considered as nominal diameter, and plates from mineral wool on basalt base of “Rockwool” type are used as sound absorbing material, or from "URSA" mineral wool, or P-75 basalt wool, or glass wool with glass felt lining, wherein over its entire surface the sound absorbing element is lined with acoustically transparent material, for example, a glass-fiber fabric of E3-100 type or polymer of "poviden" type.

EFFECT: technical result is increase in the efficiency of acoustic suppression and reliability of the structure in general.

8 cl, 1 dwg