ACOUSTIC ENCLOSURE Russian patent published in 2018 - IPC G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, particularly, to broadband noise suppression, and can be used in all branches of the national economy with sound attenuation of production equipment by sound absorption method. In the acoustic enclosure, containing profiled and perforated walls, between which the sound-absorbing material layer is placed, wherein one of the walls is made smooth, and the sound-absorbing material is located in two layers, one of which, more rigid, is made solid and profiled, and the other, the soft one, is made discontinuous and located under the first layer surfaces, room sound-absorbing elements contain frame, window and door openings, openings for luminaires and acoustic enclosures, made in the form of rigid and perforated walls, between which arranged in two layers the sound-absorbing material is located, one of which, more rigid, is made of solid and profiled with complex profile consisting of inclined edges directed downwards and connected to the horizontal edges, and the other, the soft one, is made discontinuous and located under the first layer sound reflecting surfaces, wherein the sound absorbing material continuous profiled layer is made of a material, in which the sound reflection coefficient is greater than the sound absorption coefficient, and the discontinuous layer elements are made in the form of cone, polyhedral pyramid or figure of rotation formed by the n-th order curve.

EFFECT: improving the efficiency of noise reduction by expanding the frequency range and secondary absorption of sound waves reflected from the absorber.

9 cl, 4 dwg