SOUND ABSORBING ELEMENT (VERSIONS) Russian patent published in 2014 - IPC E04B1/84 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to industrial acoustics and can be used for minimizing of noise of machine drives, lining of industrial premises and in other sound-proof structures. Sound absorbing element comprises a smooth surface and a perforated surface between which a multilayer sound absorbing structure is placed which consists of three layers of sound-absorbing material. The first layer is more rigid, solid and profiled and is fixed on the smooth surface. The second layer is softer than the first one, is intermittent and placed in the focus of the sound reflecting surfaces of the first layer. The third layer is made from foamed sound absorbing material, for example, construction sealing foam insulation, and is placed between the first more rigid layer and the perforated surface of the sound absorbing element.

EFFECT: invention allows to improve efficiency of sound-proofing and reliability of the design in general.

8 cl, 3 dwg