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

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics and can be used for machine drive noise reduction, lining of manufacturing facilities and in other sound-absorbing structures. Sound-absorbing element with resonant inserts contains a smooth and perforated surface, between which there is a layer of sound-absorbing material of a complex shape, which is an alternation of solid areas 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. Tops of the teeth face inside the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated walls. Cavities of the hollow sections, formed by prismatic surfaces, are filled with a sound absorber, and between the smooth surface and continuous 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. Inside the hollow sections, the internal surfaces of which have a dentate structure, there are additional resonance elements made in the form of spherical shells, inner surface of which is connected by resonant inserts with cavities located between the perforated surface and the solid sections of the sound-absorbing element.

EFFECT: technical result consists in increasing the efficiency of sound attenuation and the reliability of the structure as a whole.

1 cl, 1 dwg