SINGLE SOUND ABSORBER WITH VOLUMETRIC SOUND-REFLECTING ELEMENT Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics. Technical result is achieved due to fact, that a single sound absorber with a sound-reflecting volumetric element consists of a rigid frame, suspended by the hooks on the cables to the production building ceiling with the located inside the frame sound-absorbing element, wherein the frame is made in the form of a rectangular parallelepiped with the ribs dimensions of L×H×B, which ratio lies in the optimal range of the quantities L:H:B = 2:1:0.5, characterized by that the sound-absorbing element is made in the form of a combined multi-layer sound-absorbing structure, consisting of symmetrically arranged perforated walls, between which three layers are arranged: central layer from sound-reflecting material, of complex profile, composed of evenly distributed hollow tetrahedrons, allowing to reflect sound waves incident in all directions, and sound-absorbing layers of materials with different density symmetrically adjacent thereto, at that, each of the perforated walls has the following perforation parameters: holes diameter of 3÷7 mm, perforation percentage of 10÷15%, and as a sound-absorbing material plates from mineral wool are used, wherein the sound absorbing element over its entire surface is lined with an acoustically transparent material.

EFFECT: technical result is increase in the noise attenuation efficiency at high frequencies by introducing into the sound-absorbing element, located inside the perforated cylindrical busing shells of the sound-reflecting layers, which perform the soundproofing function at high frequencies.

1 cl, 2 dwg