SPHERICAL SOUND ABSORBER Russian patent published in 2017 - IPC E04B1/82 

FIELD: physics.

SUBSTANCE: spherical sound absorber contains sound absorbers of active and reactive types, placed on a rigid frame. The frame is spherical with an internal congruent framework with a spherical resonance cavity formed by a rigid continuous spherical shell, an equidistant outer perforated spherical shell. The space between the spherical shells is filled with a sound absorbing material. The connection of the outer perforated spherical shell to the object, for example the ceiling of the production room, is carried out by means of an elastic damping element allowing to damp high-frequency oscillations and pivotally connected to a suspension made in the form of a rod, one end of which is connected to a hinge mounted on the resilient damping element, and the other end is connected to the ring designed to fix it on the object. The spherical resonance cavity is rigidly connected by, at least, one sleeve with an axial hole serving as the neck of a Helmholtz resonator with an outer perforated spherical shell, and the space between them is filled with a sound absorber.

EFFECT: invention allows to improve the efficiency of noise attenuation at high frequencies by introducing into the unit sound absorber of cavities for Helmholtz resonators.

2 cl, 1 dwg