ACOUSTIC PANEL Russian patent published in 2016 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to an industrial acoustics, particularly broadband and low-frequency sound insulation. Acoustic panel consists of at least two sound-absorbing sections, each of which comprises walls made of corrugated perforated material, between which there are sound-absorbing elements. Walls of corrugated material are provided with slotted perforation made of stainless steel or a galvanized steel sheet 0.7 mm thick with a polymer protective and decorative coating such as "Pural" 50 mcm thick or "Polyester" 25 mcm thick, or of an aluminium sheet 1.0 mm thick and coating 25 mcm thick. Sound absorbing sections are suspended on ropes by hooks. Each of sound-absorbing elements is in form of perforated plates between which layers are arranged symmetrically with a reflecting material, and in centre of reflecting material between layers of sound-absorbing materials are layers of different density disposed in two layers. Layers of sound reflecting material are made from complex profile composed of evenly distributed hollow tetrahedrons, allowing for reflection of acoustic waves incident in all directions, and being installed respectively at perforated plates. Perforated plate can be made of plastic, for instance, caprone, or metal mesh with small cells.

EFFECT: invention improves acoustic characteristics of the panel at low, medium and high frequencies with provision of dust repulsion.

1 cl, 2 dwg