ACOUSTIC SCREEN Russian patent published in 2018 - IPC E01F8/00 E04B1/84 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, particularly, to broadband acoustic suppression. Each of the opaque sound-absorbing acoustic panels contains a smooth and perforated surface, between which a composite sound-absorbing layer of complex shape is placed. Material is an alternation of solid sections and hollow sections, the frame of which is made of a rigid sound-absorbing material. Hollow sections are formed by prismatic surfaces with cross-sections parallel to plane of drawing, parallelogram shape, which inner surface have toothed or wavy structure. Teeth tops face inside prismatic surfaces. Prismatic surfaces ribs are secured on smooth and perforated surfaces, respectively. Cavities formed by a smooth and perforated surfaces, between which a composite sound-absorbing layer of complex shape is located, are filled with a soft sound-absorbing material. Hollow cavities formed by prismatic surfaces are filled with a foamed polymer, for example polyethylene or polypropylene. Hollow cavities formed by prismatic surfaces are connected by resonant holes and with cavities formed by smooth and perforated surfaces, between which a composite sound-absorbing layer of complex shape is located.

EFFECT: higher efficiency of noise suppression.

1 cl, 3 dwg