SOUND-ABSORBING PANEL Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: construction.

SUBSTANCE: invention relates to the noise-absorbing panel. Noise-absorbing panel contains frame and located in its internal cavity sound-absorbing element, 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, wherein the perforation is made slotted in the form of arranged in rows rectangles, and the adjacent rows are located with the offset, while the number of slits in one row is even, and in the other – odd, at that, ratio of the odd rows width b₁ to the even rows width b₂ is in the optimum range of values b₁/b₂=0.7…0.9, and ratio of the distances between the h₁ and h₂ rows is equal to h₁/h₂=2.0, wherein the panel walls are fixed to each other by the vibration damping covers, and as the sound-absorbing element sound-absorbing material plates from the “Rockwool” type basalt-based mineral wool are used, wherein on its entire surface the sound absorbing element is lined with acoustically transparent material, for example, EZ-100 glass fabric, frame front and rear walls are made of the 0.7 mm thick galvanized sheet with polymeric protective and decorative coating of the “Pural” type with thickness of 50 mcm, fixing the panel walls vibration damping covers are made of elastomer with an internal losses factor not lower than 0.2, and the sound-absorbing element is made with resonant inserts and comprises smooth and perforated surfaces, between which the complex shaped sound-absorbing material layer is arranged, complex shaped layer is an alternation of solid sections and hollow sections, wherein the hollow sections are formed by prismatic surfaces in the cross-section parallel to the drawing plane having a parallelogram shape, which inner surfaces have toothed structure, at that, teeth tops face inside the prismatic surfaces, and the prismatic surfaces ribs are secured on smooth and perforated walls, respectively, wherein formed by the prismatic surfaces hollow sections cavities are filled with the sound absorber. Between the complex shaped sound-absorbing material layer smooth surface and solid sections, as well as between the perforated surface and solid sections, resonance plates with resonant inserts are located, performing the “Helmholtz” resonators necks functions.

EFFECT: technical result is improvement in the noise absorption efficiency.

1 cl, 2 dwg