KOCHETOV'S ACOUSTIC DEVICE Russian patent published in 2017 - IPC E04B1/84 G10K11/16 

FIELD: machine engineering.

SUBSTANCE: acoustic device comprises, at least, two sound absorbing sections, each of which comprises walls of the corrugated perforated material, between which the sound absorbing elements are located. The walls of the corrugated material are made with slotted perforation of stainless steel or galvanized sheet. The sound absorbing sections are suspended on the cables on hooks. Each of the sound absorbing elements is made as perforated plates with the layers of the sound reflecting material being placed between them. In the center, the layers of the sound absorbing materials of different densities are located between the layers of the sound reflecting material. Between the latter, the resonant inset with a set of plugs with the resonant holes connected with resonant inserts, is located. The layers of the sound reflecting material are made from a complex profile consisting of the evenly distributed hollow tetrahedrons allowing to reflect acoustic waves incident in all directions, and are installed respectively at the perforated plates. The perforated plate can be made of plastic, such as caproic, or metal mesh with small cells.

EFFECT: invention improves the acoustic characteristics in low, mid and high frequencies, at the same time provides dustproof.

3 cl, 2 dwg