KOCHETOV SOUND ABSORBING LINING FOR PROCESS STRUCTURES Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics and can be used for machine drive noise reduction, lining of manufacturing facilities and in other sound-absorbing structures. Technical result is achieved due to fact, that process structures noise-absorbing lining contains the continuous and perforated surfaces, between which a multilayer sound-absorbing element is placed, characterized by, that the multi-layer sound-absorbing element is made in the form of three layers: central layer of sound-reflecting material, of complex profile, composed of evenly distributed hollow tetrahedrons, allowing to reflect sound waves incident in all directions, and sound absorbing layers of different density materials symmetrically adjacent thereto, each of the perforated walls has the following perforation parameters: diameter of the holes is 3÷7 mm, perforation percentage is 10%÷15%, and the shape of the holes can be made in the form of holes of round, triangular, square, rectangular or diamond-shaped profile, wherein in case of non-circular holes, the maximum diameter of circle inscribed into a polygon shall be considered as a nominal diameter, and plates from mineral wool on basalt base of “Rockwool” type are used as sound absorbing material, or “URSA” type mineral wool, or P-75 type basalt wool, or from a glass wool with a glass felt, herewith the sound absorbing element over its entire surface is lined with an acoustically transparent material, for example, EZ-100 glass fabric or "poviden" type polymer.

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

8 cl, 1 dwg