SOUND ABSORBING ACOUSTIC FENCING Russian patent published in 2017 - IPC F01N1/04 

FIELD: construction.

SUBSTANCE: fencing comprises a profiled wall and a perforated wall, between which a layer of a sound-absorbing material is placed. One of the walls is made smooth, and the absorbent material is arranged in two layers, one of which, a harder one, is made continuous and profiled, and the other, a soft one, is made discontinuous and arranged beneath the surfaces of the first layer. The fencing comprises a frame, window and door openings, apertures to accommodate lighting fixtures, and acoustic fencings comprising the smooth and perforated walls, between which an absorbent material is placed, arranged in two layers, one of which, a harder one, is made composite, consisting of alternating spherical surfaces and flat surfaces with resonant openings, and the other, a soft one, is made discontinuous in the form of discontinuous sound absorbers and is arranged in the focus of the sound reflecting surfaces of the first layer. The composite layer is made of a sound-absorbing material, whose sound reflection coefficient is greater than the sound absorption coefficient, and the discontinuous sound absorber located in the focus of the composite layer is made in the form of rotation bodies, such as a sphere, an ellipsoid, a cone, a truncated cone, and is fixed on the perforated wall by means of pins, one end of which is rigidly fixed to the perforated wall, and the other is made pointed and arranged in the body of the discontinuous sound absorbers.

EFFECT: increasing the noise absorption efficiency.

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