SOUND ABSORBING DESIGN OF SHOP Russian patent published in 2011 - IPC E04B1/74 

FIELD: machine building.

SUBSTANCE: here are disclosed sound absorbing devices of shop floor. These devices contain profiled and perforated walls with a layer of sound absorbing material between them. Also, one of the walls is flat. Sound absorbing material is arranged in two layers. One, more rigid, layer is solid and profiled; another, more soft one, is non-continuous and is laid under surfaces of the first layer. The sound absorbing devices of the shop floor have a frame, window and door openings, and openings for arrangement of lights and acoustic barriers with flat and perforated walls with sound absorbing material in two layers. One, more rigid layer, is solid and profiled. Another, more soft layer, is non-continuous in form of non-continuous sound absorbers. It is positioned is a focus of sound reflecting surfaces of the first layer. The continuous profiled layer of sound absorbing material is made out of material with sound reflection factor higher, than sound absorbing factor. The non-continuous sound absorber located in the focus of the solid profiled layer is made in form of solids of revolution, for example, sphere, ellipsoid, cone, or truncated cone and is secured on the perforated wall by means of pins, one end of which is rigidly attached to the perforated wall, while another one is pointed and enters the body of non-continuous sound absorbers.

EFFECT: raised efficiency of noise absorbing due to extended frequency range and secondary absorbing sound waves reflected from sound absorber.

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