SOUND ABSORPTION ELEMENT WITH RESONANT INSERTS Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to a sound-absorbing element with resonant inserts. Sound-absorbing element with resonant inserts contains a smooth and perforated surface, between which is a layer of sound-absorbing material of complex shape. Sound-absorbing element with resonant inserts is an alternation of solid sections and hollow sections. 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. Ribs of prismatic surfaces are secured on 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. As a sound-absorbing material of continuous areas, mineral wool on a basalt basis of the Rockwool type, or mineral wool of the URSA type, or basalt wool of type P-75, or glass wool with glass fiber lining, or foamed polymer, for example polyethylene or polypropylene, is applied.

EFFECT: technical result is the improvement in the efficiency of acoustic suppression.

3 cl, 1 dwg