METHOD OF SOUND ABSORPTION 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. In the method of sound absorption with resonant inserts between the smooth and perforated surfaces of the sound-absorbing element, a layer of sound-absorbing material of complex shape is placed. Layer of complex shape is made in the form of alternating solid sections and hollow sections, the hollow sections is in the form of prismatic surfaces having, in the section parallel to drawing plane, parallelogram shape, and the inner surfaces are made in the form of a toothed structure. Tops of the teeth face the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated surfaces. 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, are box-shaped, the upper surface of which is adjacent to the solid sections of the layer of sound-absorbing material, and the angles of the side faces are fixed to the perforated surface. 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. Parameters of the resonant inserts are calculated by certain mathematical dependencies.

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

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