SOUND-ABSORBING ELEMENTS OF PREMISES Russian patent published in 2011 - IPC E04B1/74 

FIELD: construction.

SUBSTANCE: in sound-absorbing elements of a premise, containing profiled and perforated walls, between which there is a layer of sound-absorbing material, besides, one of walls is arranged as smooth, and sound-absorbing material is arranged in two layers, one of which, more rigid one, is arranged as solid and profiled, and the other one, soft one, is arranged as interrupted and is located over surfaces of the first layer. Sound-absorbing elements of premises comprise frame, window, door openings, openings to locate lamps and acoustic barriers, arranged in the form of rigid and perforated walls, between which there is a sound-absorbing material arranged in two layers. One layer, a more rigid one, is arranged as solid and profiled, of complex profile, made of inclined faces, directed downwards and joined with horizontal faces, where resonant holes are provided, and the other one - soft one, is arranged as interrupted and is located under sound-reflecting surfaces of the first layer. Besides, solid profiled layer of sound-absorbing material is made of material, sound reflection coefficient of which is higher than coefficient of sound absorption.

EFFECT: increased efficiency of sound absorption.

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