SHOP FLOOR SOUND-ABSORBING STRUCTURE Russian patent published in 2014 - IPC E04B1/82 

FIELD: machine building.

SUBSTANCE: in a sound absorbing structure of a shopfloor comprising the shop framework, window and door openings, opening for luminaries, acoustic enclosures and elements of a sound absorber, the acoustic enclosures are made as a smooth wall and a perforated wall with sound absorbing material being placed between them. The material is laid in two layers: one of them is rigid, continuous and profiled, and the other one is soft, intermittent and set in the focus of the sound reflecting surfaces of the first layer. The continuous profiled layer of the sound absorbing material is made from the material with its sound reflection coefficient exceeding the sound absorption coefficient; the profiles are formed by spherical surfaces joint to each other so that each of the profiles as a whole forms a solid dome-shaped profile focusing the reflected sound on the same soft sound absorber. The latter is set in the focus of the continuous profiled layer made in the form of bodies of rotation, for examples, spheres, ellipsoids of rotation, and is fastened by the rods parallel to the perforated wall and rigidly fixed to the smooth wall by vertical bracing.

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

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