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 is a layer of sound-absorbing material of complex shape. Layer of complex shape 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. 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. Resonance plate with resonant inserts placed between the perforated surface and the solid sections of the layer of sound absorbing material of complex shape, is box-shaped, upper surface of the plate is adjacent to the solid sections of the layer of sound absorbing material, the angles of the side faces are fixed to the perforated surface, and its lower surface facing the perforated surface is set in relation to it with a gap necessary for placing resonant inserts that perform the functions of throats of the Helmholtz resonators.

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

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