METHOD OF ACOUSTICAL PROTECTION OF THE OPERATOR Russian patent published in 2017 - IPC E04B1/74 G10K11/16 E04B1/84 

FIELD: physics.

SUBSTANCE: operator's acoustic protection method includes equipping the operator's workplace with noise reduction. The workplace of the operator is placed between the acoustic screens and thus protects the operator from direct sound, which is spread from the vibration equipment. To increase the effectiveness of protection against reflected sound waves, an acoustic suspended ceiling located in the upper zone of the room is installed above the working area. To reduce sound vibration, the operator's workplace is equipped with a floor on an elastic base. Two-stage vibration protection of operator is performed. Attenuating sound absorber consists of a rigid frame, suspended with the hooks from the ceiling of the facility with sound-absorbing material inside the housing. The expanded steel sheet is fastened to the wireframe. The frame is made in the form of a rectangular parallelepiped with the dimensions of the edges d×h×b, the ratio of which lies in the optimal range of d:h:b = 2:1:0.5 or a cube with the size of the edge k×L, where min L=100 mm; k is a coefficient of proportionality, lying in the range from 1 to 10 in steps of 2. For all suspension schemes, the optimal size ratios should be respected: m - from the suspension point of the carcass on the guide to the ceiling and c is the distance between the axes of the adjacent frames. The ratio of these dimensions should be in the optimal range of values: m:c=1:1…0.5:1. The sound absorber is made in the form of a spherical acoustic absorber of active and reactive types, placed on a rigid frame, made in a spherical shape with an internal congruent framework by a spherical resonance cavity formed by a rigid continuous spherical shell, an equidistant outer perforated spherical shell. The space between the spherical shells is filled with sound absorbing material. The connection of the outer perforated spherical shell to the object, for example the ceiling of the production room, is carried out by means of an elastic damping element allowing to damp high-frequency oscillations and pivotally connected to a suspension made in the form of a rod, one end of which is connected to a hinge mounted on the resilient damping element, and the other is connected to the ring designed to fix it on the object. The spherical resonant cavity is rigidly connected by at least one sleeve with an axial hole serving as the neck of a Helmholtz resonator with an outer perforated spherical shell, and the space between them is filled with a sound absorber.

EFFECT: invention makes it possible to increase the efficiency of noise attenuation by increasing the sound absorption coefficient by expanding the sound absorption surfaces while maintaining the overall dimensions of the room.

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