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

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, particularly, to broadband acoustic suppression. Each of the opaque noise-absorbing acoustic panels of the acoustic screen comprises a smooth and perforated walls, between which there is a layer of sound-absorbing material of complex shape. Layer is alternating solid sections and hollow sections. Hollow sections are formed by prismatic surfaces that are in their cross-section parallel to the plane of the drawing, have the shape of a parallelogram, whose inner surface has a toothed or wavy structure. Teeth tops face inside the prismatic surfaces. Ribs of the prismatic surfaces are secured on the smooth and perforated walls respectfully. Cavities of hollow sections, formed by prismatic surfaces, are filled with a sound absorber. Between a smooth surface and solid sections of the layer of sound-absorbing material of complex shape, as well as between the perforated surface and solid sections, there are resonant plates with resonant inserts performing the functions of the neck of Helmholtz resonators.

EFFECT: higher efficiency of noise suppression.

1 cl, 3 dwg