KOCHETOV(S SINGLE ACOUSTIC ABSORBER Russian patent published in 2016 - IPC F01N1/04 

FIELD: machine building.

SUBSTANCE: sound absorber contains a cylindrical framework in the form of perforated bushing and lids, filled with a sound absorber, and outside the bushing there is the layer of an acoustically transparent enclosure out of capron mesh or glass fabric, and the framework has lids with ring collars to secure the cylindrical bushing, wherein the lids are connected by a central rod with hooks at both ends, and the cylindrical bushing comprises two perforated shells - external and internal, the space between them is filled with a sound absorbing element, wherein the sound absorbing element contains perforated walls, between them layers of sound reflecting, as well as sound absorbing materials of different density are arranged in two layers. The layers of the sound reflecting material are made from a complex profile composed of evenly distributed hollow tetrahedrons, allowing for the reflection of acoustic waves incident in all directions, and being installed respectively at the perforated walls and the layers of the sound reflecting material are made out of a thermal insulating material.

EFFECT: increased efficiency of noise suppression at high frequencies by the insertion in the sound absorbing element, located inside the shells of the perforated cylindrical bushing of the sound reflecting layers, acting as sound insulation at high frequencies.

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