DEVICE FOR ACOUSTIC PROTECTION OF OPERATOR Russian patent published in 2018 - IPC E04B1/82 G10K11/16 

FIELD: security facilities.

SUBSTANCE: invention relates to means of safety of operation of operators in emergency situations, particularly at high levels of noise. Device for acoustic protection of operator comprises operator workstation, equipped with means of reducing noise. Operator workstation is located between acoustic shields, which protect operator from direct sound propagating from vibration active equipment. Above working zone there is suspended ceiling, arranged in upper zone of room. To reduce sound vibration operator workstation is equipped with floor on elastic base providing two staged protection of operator. Also there is a rocker acoustic absorber, which consists of rigid frame suspended by hooks on ropes to building ceiling with sound absorbing material wrapped in mesh caproic fabric located inside frame, expanded stretching steel sheet is fixed to frame. Frame is made in the form of a rectangular parallelepiped with the dimensions of the edges d×h×b, ratio of which is within the optimal range of values d:h:b = 2:1:0.5 or a cube with a size of the edge k×L, where min L = 100 mm; k-coefficient of proportionality, being in the range from 1 to 10 in steps of 2. For all suspension schemes, the optimal size ratios must be observed: m – from the suspension point of the frame on the guide to the ceiling and c is the distance between the axes of the adjacent frames. Ratio of these sizes should be in the optimal range of values: m: c = 1:1 … 0.5:1. Device also includes wall acoustic noise-absorbing panels installed on the floor, when installing a ribbon strip VIBROSTEK-M is used, which is laid in two layers in places where they are supported on the floor, and in the areas of contact of the panels with the side walls and ceiling. When mounting “Vibrosil” type sealant is used: one-component vibration isolating silicone sealant for sealing of joints and connections in special sound insulating structures. As vibration isolating wall fasteners “VIBROFLEX” type shock-absorbing device is used for solving tasks of reducing noise and vibrations transfer in premises of any type and purpose. For mounting to vertical enclosing structures wall versions of ER type fasteners, which is microporous polyurethane elastomer, especially for solving tasks of sound and vibration insulation. Acoustic noise-absorbing panel is made in the form of a sound-absorbing element in the form of a body with external and internal perforated walls, between which there are layers of sound-absorbing material. First layer is more rigid, solid and profiled and is fixed on outer surface. second layer is softer than first one, it is intermittent and placed in focus of sound reflecting surfaces of first layer. Third layer of sound-absorbing element is made from foamed sound absorbing material, for example a construction sealing foam, and is located between first, more rigid layer and perforated surface of sound absorbing element. Discontinuous sound-absorbing layer located in focus of solid profiled layer is made in form of bodies of revolution and is attached by means of rods parallel to perforated surfaces, which are rigidly connected to each other by means of vertical fastening elements perpendicular to them, one end of which is rigidly fixed to a smooth surface, and second one is made in form of clamp enclosing rod and tightening it with screw. Solid shaped layer is made from more rigid sound-absorbing material with sound reflection factor higher than that of sound absorption. Profiles are formed by spherical surfaces, connected together so that

in general each of the profiles forms a solid domed profile that focuses the reflected sound on the same soft intermittent sound-absorbing layer. Intermittent sound-absorbing layer located in focus of solid profiled layer, comprises at least one rigid resonant shell with resonant holes that perform the functions of the neck of the Helmholtz resonators, wherein the cavity of the shell is an additional volume of the Helmholtz resonators.

EFFECT: invention allows to improve efficiency of noise suppression.

1 cl, 8 dwg, 1 tbl