KOCHETOV(S SOUND ABSORBER FOR LINING MANUFACTURING FACILITIES Russian patent published in 2015 - IPC E04B1/84 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to industrial acoustics. A sound absorber for lining manufacturing facilities comprises rigid and perforated walls with a multilayer sound absorbing element in between. The multilayer sound absorbing element is in the form of five layers, two of which adjoin the walls are sound absorbing layers made of material with a different density, and the three central layers are composite. The axial layer is sound-absorbing and the two symmetrical adjoining layers are 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. The perforated wall 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. The sound-absorbing material used is 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. 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