SOUND-ABSORBING STRUCTURE OF ROOM Russian patent published in 2013 - IPC E04B1/74 

FIELD: construction.

SUBSTANCE: sound-absorbing structure of a room comprises a frame of a room, window and door openings, acoustic barriers of shop surfaces and unit sound absorbers of conical and prismatic types above noisiest process equipment. Acoustic barriers comprise profiled and perforated walls, between which a layer of a sound-absorbing material is arranged. Elements of a sound-absorber of prismatic type above noisiest process equipment comprise a frame suspended by hooks, for instance, on cables or directly fixed to a rigid wall or a ceiling of a production room. The frame is arranged by its form in the form of two cubic surfaces, one of which is external, the outer one, is arranged as perforated, and the other one, the inner one, - acoustically transparent. The sound-absorbing material wrapped with a meshy nylon fabric is arranged in the gap between frames. The relation of the ratio (H/W) of parameters of the production room to thickness HI of the acoustic barrier is in the optimal range of values 0.0007÷0.006, and the relation of the ratio (H/W) of the room height to its width to the ratio (H2/R) of thickness of the sound absorber element to its height of suspension is in the optimal range of values 0.27÷0.68. Elements of the sound absorber of conical type comprise a rigid conical frame with a round cover, tightly adjacent to the base of the cone as a result of a fastening spring, arranged inside the frame and connecting a metal cap, arranged at the cone top with a hook for suspension to the production room ceiling. On the inner conical surface of the frame there is a sound-absorbing element from mineral fibre in a wrapper from coarse fabric or sackcloth. The frame with the round cover have perforation in the form of holes of round, slot or rectangular shape and are made of metal.

EFFECT: invention makes it possible to increase efficiency of noise absorption due to expansion of the frequency range and secondary absorption of sound waves reflected from a sound absorber.

2 cl, 5 dwg