METHOD OF ACOUSTICAL PROTECTION OF THE OPERATOR Russian patent published in 2018 - IPC E04B1/84 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics, particularly, to broadband acoustic suppression, and can be used in all sectors of national economy as means of noise protection. Method of acoustic protection of the operator is that the operator's workplace is equipped with noise reduction means, placing it between the acoustic screens. Above the working area is installed an acoustic suspended ceiling located in the upper zone of the room. Operator's workplace is equipped with a floor on an elastic base, a two-stage vibroprotection of the operator is performed. Rock absorber consists of a rigid frame suspended by hooks on cables to the ceiling of a production building with sound absorbing material inside the frame, wrapped with a mesh capron cloth, and a stretched-drawn steel sheet is attached to the frame. 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 with a spherical resonance cavity, formed by rigid continuous spherical shell, an equidistant outer perforated spherical shell. Space between the spherical shells is filled with a sound-absorbing material, and the connection of the outer perforated spherical shell with the object, for example, the ceiling of the production room, is performed by means of an elastic damping element that allows to damp high-frequency oscillations and is pivotally connected to a suspension made in the form of a rod, one end of which is connected to a hinge mounted on the resiliently damping element, and the other – connect with the ring, designed to fix it on the object. Spherical resonant cavity is rigidly connected by at least one sleeve with an axial hole serving as a neck of the Helmholtz resonator, with an outer perforated spherical shell, and the space between them is filled with a sound absorber. Sound-absorbing lining of heat and sound insulating fences rigidly connected to the columns is made in the form of a rigid and perforated wall, between which a multi-layer sound-absorbing element is disposed, which is made in the form of two layers: one of which, adjacent to the rigid wall, is sound-absorbing, and the other, adjacent to the perforated wall, is made with a perforation from a sound-reflecting material of a complex profile consisting of uniformly distributed hollow tetrahedra.

EFFECT: technical result is an increase in the efficiency of noise suppression.

1 cl, 8 dwg