KOCHETOV(S RESONANT ACOUSTIC ABSORBER Russian patent published in 2016 - IPC E04B1/82 

FIELD: acoustics.

SUBSTANCE: resonance absorber comprising a rigid frame made of upper active part and lower reactive part, the reactive part is made in form of at least three coaxial and axially spaced resonant cylinders which cavities are provided with holes of different diameter, performing the functions of necks of the Helmholtz resonator, and supporting wheels situated at the ends of cylinders rigidly and hermetically connect them together, forming a reactive part of rigid frame of absorbers, while the upper active part is made of a rigid perforated cylindrical shell with a perforated cap and solid base, the cavity of cylindrical shell is filled with sound absorbing material and the connection between upper and lower part is made by elastic-damping element to damp high-frequency vibrations; perforated cover of perforated cylindrical shell comprises hinged element, whereby the frame is attached to the target object, and around the perforated cylindrical shell there is at least one screw absorbing element made in form of a coil spring covering the shell and resting on supporting disc connected to the reactive part of absorber.

EFFECT: sound attenuation enhancement at high frequencies by equipping volumetric sound absorber with cavities for the Helmholtz resonator that increase the efficiency at high frequencies.

1 cl, 1 dwg