RESONANCE SOUND ABSORBER WITH ACTIVE HELICAL ELEMENT Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to means of reducing noise in industrial and transport facilities. Resonant sound absorber with the active helical element contains rigid frame from the upper active part, and the lower, reactive part, at that, the reactive part is made in the form of at least three coaxially and axial symmetrically arranged resonance cylinders, which cavities are provided with holes of different diameters, performing the Helmholtz resonator necks functions, and located along the cylinders ends support disks rigidly and hermetically connect them to each other, forming the sound absorber rigid frame reactive part, at that, the upper, active part is made in the form of rigid perforated cylindrical shell with perforated cover and solid base, wherein the cylindrical shell cavity is filled with sound-absorbing material, and the upper and lower parts connection is made by means of elastic-damping element, allowing to damp high-frequency oscillations, at that, to the perforated cylindrical shell perforated cover an element is hinged by means of which the frame is fixed to the desired object, and around the perforated cylindrical shell at least one helical sound-absorbing element is located, made in the form of enclosing the shell cylindrical helical spring, and supported by the connected to the sound absorber reactive part support disk, at that, as the sound-absorbing material plates from the basalt-based mineral wool are used, or as the sound-absorbing material the sound-absorbing porous material is used, or as the sound-absorbing material, the heat-resistant, highly porous fibrous heat-insulating and sound-absorbing material is used.

EFFECT: technical result is an increase in the efficiency of noise attenuation at high frequencies by introducing into a unit acoustic absorber of cavities for Helmholtz resonators that increase efficiency at high frequencies.

3 cl, 1 dwg