SOUND-ABSORBING PANEL Russian patent published in 2018 - IPC E04B1/82 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics. In the noise-absorbing panel, containing a frame and a sound-absorbing element located in its internal cavity, the frame is made in the form of a parallelepiped formed by the front and rear perforated walls with a perforation coefficient equal to or greater than 0.25, each of which is U-shaped with lateral ribs, and the perforation is made slotted in the form of rectangles arranged in rows, and the adjacent rows are disposed with an offset, while the number of slits in one row is even, and in the other – odd, the ratio of the width of odd rows b₁ to the width of even rows b₂ being in the optimal range of b₁/b₂=0.7…0.9, and the ratio of the distances between rows h₁ and h₂ being equal to h₁/h₂=2.0, where the walls of the panel are fixed together by vibration-cushioning covers, and as a sound-absorbing material of the sound-absorbing element, plates of basalt-based mineral wool are used, and the sound-absorbing element is lined with acoustically transparent material over its entire surface, front and rear walls of the frame are made of galvanized sheet, vibration-cushioning covers fixing the panel walls are made of elastomer, as a sound-absorbing material, an element in the form of layer-by-layer and cross winding of aerated yarns wound on an acoustically transparent frame is used, or as a sound-absorbing material, an element of a rigid porous sound-absorbing material is used, characterized in that the sound-absorbing element comprises a smooth and perforated surfaces, between which the is a combined sound-absorbing layer of a complex shape, which is an alternation of solid sections and hollow sections, the frame of which is made from a rigid sound-absorbing material, the hollow sections are formed by prismatic surfaces having in the cross section parallel to the plane of the drawing the shape of a parallelogram, which internal surfaces have a toothed structure, herewith the vertices of the teeth face the inside of the prismatic surfaces, and the ribs of the prismatic surfaces are fixed respectively on the smooth and the perforated surfaces, herewith the cavities formed by the smooth and the perforated surfaces, between which the composite sound absorbing layer of a complex shape is located, are filled with a soft sound-absorbing material, and cavities of hollow sections formed by prismatic surfaces are filled with a foamed polymer, for example polyethylene or polypropylene, wherein cavities of hollow sections formed by prismatic surfaces are connected by resonant holes with cavities formed by smooth and perforated surfaces, between which a composite sound-absorbing layer of complex shape is located.

EFFECT: technical result is increased efficiency of noise absorbing due to wider frequency range, simplification and versatility of installation and improved operational properties due to the use of perspective sound-absorbing and protective-decorative materials.

1 cl, 2 dwg