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

FIELD: physics, acoustics.

SUBSTANCE: invention relates to industrial acoustics. The sound-absorbing structure is in the form of two perforated walls with a multilayer sound-absorbing element in between. The multilayer sound-absorbing element is two-layered. The layer adjoining one of the walls is sound-absorbing and the layer adjoining the other perforated wall is made of sound-reflecting material with a complex profile, which consists of uniformly distributed hollow tetrahedrons, which enable to reflect sound waves incident in all directions. Each of the perforated walls has the following perforation parameters: hole diameter 3-7 mm, perforation percentage 10-15%, wherein the holes can be circular, triangular, square, rectangular or rhomboid. In case of non-circular holes, the nominal diameter should be considered the maximum diameter of the circle inscribed in the polygon. As the sound-absorbing material in the form of Rockwool mineral wool boards on a basalt base or URSA mineral wool or P-75 basalt wool or glass wool lined with glass felt is used. The sound absorbing element on its entire surface is lined with an acoustically transparent material, for example, EZ-100 glass cloth or Poviden polymer.

EFFECT: high efficiency of sound-proofing and reliability of the structure as a whole.

4 cl, 1 dwg