PRODUCTION ROOM SOUND ABSORPTION DEVICE Russian patent published in 2018 - IPC E04B1/82 

FIELD: acoustics.

SUBSTANCE: invention relates to the industrial acoustics, particularly, to the broadband noise suppression, and can be used in all branches of the national economy during the production equipment noise suppression by the sound absorption method. Production room sound-absorbing device contains smooth and perforated surfaces, between which multilayer sound absorbing structure is arranged, made in form of rigid and perforated walls, between which the two layers are located: adjoining the rigid wall sound-reflecting layer, and adjoining the perforated wall sound-absorbing layer. Sound-reflecting material layer is made of complex profile, consisting of uniformly distributed hollow tetrahedrons allowing to reflect the incident in all directions sound waves. Perforated wall has the following perforation characteristics: holes diameter – 3÷7 mm, perforation percentage of 10 %÷15 %, wherein by the form holes can be made in the form of round, triangular, square, rectangular or diamond-shaped profile holes, at that, in case of non-circular holes, as the conditional diameter the inscribed in the polygon circle maximum diameter should be considered. As the sound-absorbing material, basalt-based “Rockwool” type mineral wool is used, or “URSA” type mineral wool, or P-75 type basalt wool, or glass wool with glass felt lining, or foamed polymer, for example, polyethylene or polypropylene, at that, the fibrous sound absorbers surface is treated with special air permeable porous paints (for example, “Acutex T”) or coated with the air-permeable fabrics or nonwoven materials, for example, “Lutrasil”. And also as the sound-absorbing material porous noise-absorbing material or material in the form of compacted crumb from hard vibration damping materials, porous mineral single piece materials can be used. At that, the fibrous sound absorbers surface is treated with special air permeable porous paints. Also, as the sound-reflecting material, the aluminum-containing alloys based material can be used, with their subsequent filling with titanium hydride or air, or the “Noise-stopper” type glass staple fiber based soundproofing plates.

EFFECT: increase in the noise suppression efficiency due to the frequency range expansion and reflected from the sound absorber sound waves secondary absorption.

1 cl, 4 dwg