FIELD: acoustics.
SUBSTANCE: invention relates to industrial acoustics and can be used for machine drive noise reduction, for lining of manufacturing facilities and for other sound-absorbing structures. Wall resonance panel contains a smooth and perforated surface between which is placed a composite sound-absorbing layer of complex shape, which is an alternation of solid areas and hollow sections, frame of which is made of a rigid sound-absorbing material based on aluminum-containing alloys, followed by their filling with titanium hydride or air with a density within 0.5…0.9 kg/m3 with the following strength properties: compressive strength within 5…10 MPa, bending strength within 10…20 MPa, for example foam aluminum. In this case, the hollow sections are formed by prismatic surfaces that have a parallelogram shape in the cross section parallel to the plane of the drawing, the internal surfaces of which have a toothed structure. Tops of the teeth face the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated surfaces. Cavities formed by a smooth and perforated surfaces, between which a composite sound-absorbing layer of complex shape is located, are filled with a soft sound absorbing material of mineral wool on a basalt basis type "Rockwool", or "URSA", or basalt wool of type P-75, or glass wool with glass wool lining. Inner surface of the perforated surface facing the sound-absorbing material is lined with an acoustically transparent material, for example, glass fiber of type E3-100 or a polymer of the "Poviden" type, and cavities of hollow sections formed by prismatic surfaces are filled with a foamed polymer, for example polyethylene or polypropylene. Hollow cavity cavities formed by prismatic surfaces are connected by resonant holes and with cavities formed by smooth and perforated surfaces, between which is a composite sound-absorbing layer of complex shape. Inside the hollow sections, the internal surfaces of which have a dentate structure, there are additional resonance elements made in the form of spherical shells, inner surface of which is connected by resonant inserts with cavities located between the perforated surface and the solid sections of the sound-absorbing element.
EFFECT: technical result consists in improvement of efficiency and reliability.
1 cl, 1 dwg
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Authors
Dates
2018-02-21—Published
2017-03-14—Filed