KOCHETOV(S ACOUSTIC SCREEN Russian patent published in 2016 - IPC E04B1/82 E01F8/00 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, particularly, to broadband acoustic suppression, and can be used in all national economy industries as a means of protection from noise. Acoustic screen contains a frame with slants of metal sheets and located in it sections of acoustic panels, which are made both as noise reflecting and translucent, and opaque and noise absorbing. Their arrangement in the acoustic screen can be in any combination of vertical and horizontal rows. Each of the opaque noise absorbing acoustic panels is made as rigid and perforated walls, between which there are layers of sound reflecting and sound-absorbing materials of different density arranged in two layers. Layers of sound reflecting material have a complex profile consisting of evenly distributed hollow tetrahedrons, which allow to reflect sound waves coming in all directions, and which are located near rigid and perforated walls, respectively. Layers of sound reflecting material are made of heat insulation material capable to maintain the pre-set microclimate in a premise, while, as a sound-proof material, there are used plates of basalt-based mineral wool of “Rockwool” type, or plates of mineral wool of “URSA” type, or plates of basalt cotton wool of P-75 type, or plates of glass-wool with a woven glass liner. Sound absorbing element on its entire surface is lined with an acoustically transparent material, for example, EZ-100 glass cloth or Poviden polymer. Perforated wall has the following perforation parameters: hole diameter - 3÷7 mm, perforation percentage - 10÷15%; at that, the holes can have circular, triangular, square, rectangular or rhomboid profile. In case of non-circular holes, it is necessary to consider as the nominal diameter the maximum diameter of the circle inscribed in the polygon. Uses as sound reflecting material there is a material based on aluminum-containing alloys with subsequent filling of them with titanium hydride or air with density of 0.5…0.9 kg/m³ having the following strength properties: compression strength within 5…10 MPa, bending strength within 10…20 MPa, for example, foam aluminium, or sound insulating plates on the basis of glass staple fibre of “Shumostop” type with density of material equal to 60÷80 kg/m³.

EFFECT: invention allows to improve efficiency of noise suppression.

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