Sound-absorbing layered structure Russian patent published in 2021 - IPC E04B1/84 B60R13/08 B32B7/10 

FIELD: transport engineering; construction.

SUBSTANCE: invention relates to the field of transport engineering and construction and is a noise-reducing interior design. The sound-absorbing layered structure contains a protective and decorative acoustically transparent layer and interconnected front and mounting parts, each of which is made of at least one layer of acoustic material of different densities. Holes are made in the material layer of the mounting part. Acoustic materials are made of ventilated non-woven fiber materials. The surface density of the material of the front part is 0.9-1.3 kg/m², and the density of the material of the mounting part is 2-6 times higher than that of the material of the front part. The holes in the layer or layers of the mounting part material are made through.

EFFECT: invention makes it possible to increase sound absorption by 2-7 times in the low-frequency region of the sound spectrum (250-630 Hz) and, as a result, to increase the efficiency of broadband noise reduction.

1 cl, 2 dwg