RESONANCE SOUND ABSORBER Russian patent published in 2018 - IPC E04B1/82 

FIELD: acoustics.

SUBSTANCE: invention relates to means of reducing noise in industrial and transport facilities. Device contains rigid frame from the upper, the active one, part and lower, the reactive one, parts. 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. Upper active part is made in the form of a rigid perforated cylindrical shell with a perforated cover and a solid base. Cavity of cylindrical shell is filled with sound absorbing material. Upper and lower parts are interconnected by a resilient damping element. To the cylindrical shell perforated cover an element is hinged, by means of which the frame is fixed to the desired object. 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 resting against the support disk connected to the sound absorber reactive part. Reactive part is enclosed in the acoustically transparent spherical shell. Cavity between the spherical shell and the outer cylinder is filled with the sound absorber.

EFFECT: increase in the noise suppression efficiency at high frequencies by introduction into the single piece sound absorber of volumetric cavities for the Helmholtz resonators, which increase efficiency at high frequencies.

1 cl, 1 dwg