NOISE ABSORBING ACOUSTIC WALL OF MANUFACTURING FACILITY Russian patent published in 2009 - IPC E01B19/00 F01N1/04 

FIELD: construction.

SUBSTANCE: invention pertains to industrial acoustics, in particular, to wideband noise control and may be employed in all branches of industry for noise control of the industrial equipment by sound absorption. Sound absorbing acoustic enclosure of the manufacturing facility contains perforated wall, acoustic absorber arranged in two layers, harder one whereof is made continuous and profiled, and the other softer one is intermittent and arranged under the surfaces of the first layer. Sound absorbing enclosure of the manufacturing facility contains a frame, window and door openings, and openings for installation of lamps and acoustic enclosures containing smooth and perforated walls in between whereof there is sound absorbing material arranged in two layers, the harder one whereof is made multiple consisting of alternating surfaces, the other - softer one is made intermittent in the shape of intermittent sound absorbers and is located in the focus of the sound reflecting surfaces of the first layer. Multiple layer is made of sound absorbing material, sound reflection coefficient whereof is higher than sound absorption coefficient, and intermittent sound absorber located in the focus of the compound layer is of a evolutional shape, for example, of a cylinder, elliptic cylinder, polygonal prism and is fixed on the perforated wall by means of pintles, one end whereof is rigidly fixed on the perforated wall and the other pointed is arranged in the body of the intermittent noise absorbers.

EFFECT: increased efficiency of sound absorption due to widening of frequency range and secondary absorption of sound waves reflected from the sound absorber.

6 cl, 2 dwg