SYMMETRICAL SOUND-ABSORBING ELEMENT Russian patent published in 2018 - IPC E04B1/84 

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. Symmetrical sound-absorbing element is made in the form of two identical structures of sound-absorbing elements located symmetrically with respect to the vibration damping layer located between smooth surfaces. Each of the identical structures of sound-absorbing elements contains a layer of complex shape, which is an alternation of 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. 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 hollow sections formed by prismatic surfaces are filled with a sound absorber, and resonant plates with resonant inserts performing the functions of the necks of Helmholtz resonators are placed between the smooth surface and solid sections of the layer of sound-absorbing material of complex shape, and between the perforated surface and solid sections.

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

3 cl, 1 dwg