ACOUSTIC CONSTRUCTION FOR INDUSTRIAL PREMISES Russian patent published in 2018 - IPC E04B1/84 G10K11/16 

FIELD: acoustics.

SUBSTANCE: invention relates to industrial acoustics. Acoustic design of production facilities contains the frame of the workshop, window openings and acoustic wall fences, piece sound absorbers installed above the noisy equipment, which is installed on the vibration isolating supports. Window openings contain vacuum sound-insulating double-glazed windows, and acoustic wall fences are made in the form of noise-absorbing panels, which consist of a frame made in the form of a parallelepiped formed by the front and back walls of the panel, each of which has a U-shape. On the front wall there is a slotted perforation, between the front and rear walls of the panel there is a sound-absorbing element. Piece sound absorbers, installed over noisy equipment, are made in the form of a frame, which is 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. Space between the spherical shells is filled with sound-absorbing material, and the connection of the outer perforated spherical shell to the object is made by means of an elastic damping element hingedly connected to the suspension in the form of a rod, one end of which is connected to a hinge mounted on the resiliently damping element, and the other end is connected to a ring intended for its fixation on the object. Spherical resonant cavity is rigidly connected to 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. Acoustic noise-absorbing panel is made in the form of a rigid wall and a perforated wall, between which is a two-layer combined sound-absorbing element. Layer adjacent to the rigid wall is made sound-absorbing, and the layer 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 that allow to reflect sound waves that fall in all directions.

EFFECT: technical result consists in increasing the efficiency of noise attenuation by increasing the sound absorption coefficient by increasing the sound absorption surfaces while maintaining the overall dimensions of the room.

1 cl, 4 dwg