| 摘要 |
FIELD: construction.SUBSTANCE: method of acoustic protection includes equipping of an operator's workplace by noise reduction facilities. The operator's workplace is located between acoustic screens for protection against direct sound. For protection against reflected sound waves an acoustic suspended ceiling is installed above the working zone arranged in the upper zone of the room. To reduce the sound vibration, the operator's workplace is equipped with a floor on an elastic base, at the same time the double-cascade vibration protection of the operator is realised. A link sound absorber comprises a stiff frame suspended at hooks on ropes to a ceiling of a production building with a sound-absorbing material wrapped with a meshed caproic fabric and arranged inside the frame. An expanded steel sheet is fixed to the frame. The frame is made in shape of a rectangular parallelepiped with dimensions of ribs d×h×b, the ratio of which is in the optimum interval of values d:h:b=2:1:0.5 or a cube with the rib dimension k×L, where min L=100 mm; k - coefficient of proportionality, lying within the limits from 1 to 10 with the pitch of 2. In all schemes of suspension the optimal ratios of dimensions shall be observed: m - from the point of frame suspension on a guide to the ceiling and c - distance between axes of adjacent frames. The ratio of these dimensions shall be in the optimum interval of values: m:c=1:1?0.5:1. A wall sound-absorbing panel is installed on the slab, and it consists of a sound-absorbing board of shumanet-ECO (50 mm); a gypsum board sheet 12.5 mm; a gypsum board sheet 12.5 mm; a profile of Vibronet type PN 100/40; a gasket of Vibrostek-M type (2 layers); a sealant of Vibrosil type.EFFECT: invention makes it possible to increase efficiency of noise damping.4 cl, 6 dwg |
