RU2663976C1 - Sound absorbing element - Google Patents

Sound absorbing element Download PDF

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Publication number
RU2663976C1
RU2663976C1 RU2017139085A RU2017139085A RU2663976C1 RU 2663976 C1 RU2663976 C1 RU 2663976C1 RU 2017139085 A RU2017139085 A RU 2017139085A RU 2017139085 A RU2017139085 A RU 2017139085A RU 2663976 C1 RU2663976 C1 RU 2663976C1
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RU
Russia
Prior art keywords
absorbing
sound
smooth
perforated
fixed
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RU2017139085A
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Russian (ru)
Inventor
Олег Савельевич Кочетов
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Олег Савельевич Кочетов
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Priority to RU2017139085A priority Critical patent/RU2663976C1/en
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Publication of RU2663976C1 publication Critical patent/RU2663976C1/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84Sound-absorbing elements
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general

Abstract

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. Sound-absorbing element comprises a smooth and a perforated surfaces, between which there is a multi-layer sound-absorbing structure made in the form of a smooth and a perforated surfaces, between which there is a sound-absorbing construction of a complex shape, which is an alternation of solid sections and hollow sections. Solid sections, in turn, are formed by smooth prismatic surfaces located perpendicular to the smooth and the perforated surfaces and are fixed to the smooth surface, and also two, connected with them and inclined, relatively smooth prismatic surfaces, surfaces of complex shape, having on the one hand a smooth surface. In this case, the surfaces of a complex shape on the other hand have a toothed or wavy or spherical shape of the surface. Vertices of the teeth or protrusions face the inside of these surfaces, and the surfaces themselves are fixed onto the perforated surface. To the smooth surface tridimensional sound-absorbing elements. As a sound-absorbing material, the aluminum-containing alloys based material is used, with their subsequent filling with titanium hydride or air with 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. Material of perforated surface is made of hard decorative vibration damping materials. Facing the sound-absorbing structure perforated surface inner surface is lined with acoustically transparent material, and the hollow sections are filled with sound-absorbing material, while inside the surfaces of complex shape, having a smooth surface on one side, and on the other side of the gear, the Helmholtz resonator is fixed, made in the form of a spherical surface with diametrically fixed bushings with resonant holes. Relief sound-absorbing elements, made in the form of tetrahedra attached to a smooth surface, are installed with an alternation of sound-absorbing and resonant elements, which are a Helmholtz resonator, made in the form of a tetrahedron, with bushings fixed to it with resonant holes. In the prismatic surfaces of solid sections of the sound-absorbing element, with their alternation, resonance elements are placed, which are a Helmholtz resonator made in the form of a rectangular prism, with resonant bushings fixed on it, located on opposite faces of a rectangular prism.
EFFECT: technical result is increased efficiency of noise attenuation in the high-frequency region.
1 cl, 1 dwg

Description

The invention relates to industrial acoustics and can be used to reduce the noise of the drive machines, facing industrial premises and other sound-absorbing structures.
The closest technical solution in terms of technical nature and the achieved result is a sound-absorbing element from RF patent No. 2626471 dated July 28, 2017 (prototype), containing smooth and perforated surfaces, between which a multilayer sound-absorbing structure is placed, in the form of smooth and perforated surfaces, between which a sound-absorbing structure of complex shape is placed, which is an alternation of solid sections and hollow sections, while solid sections, in turn, are formed by smooth prismatic surfaces located perpendicular to the smooth and perforated surfaces and fixed to the smooth surface, as well as two surfaces associated with them and inclined, relatively smooth prismatic surfaces, of complex shape, having on one side a smooth surface, and on the other hand, serrated or wavy, hollow sections are filled with sound-absorbing material, for example, construction foam, while inside surfaces of complex shape, having on one side a smooth surface st, and the other side gear is secured Helmholtz resonator is formed as a spherical surface with diametrically fixed thereto bushings with resonant holes.
The disadvantage of the technical solution adopted as a prototype is the relatively low efficiency of stunning noise in the high-frequency region.
The technical result is an increase in the efficiency of sound attenuation in the high-frequency region.
This is achieved by the fact that in a sound-absorbing element containing a smooth and perforated surface, between which a multilayer sound-absorbing structure is placed, the sound-absorbing structure is made in the form of smooth and perforated surfaces, between which a sound-absorbing structure of complex shape, which is an alternation of solid sections and hollow sections, is placed at this solid areas, in turn, are formed by smooth prismatic surfaces located perpendicular to the smooth and perforated surfaces and fixed to a smooth surface, as well as two surfaces connected with them and inclined, relatively smooth prismatic surfaces, of complex shape, having on one side a smooth surface, and on the other hand a serrated or wavy, or spherical shaped surface, moreover, the tops of the teeth or protrusions are turned inside these surfaces, and the surfaces themselves are fixed on the perforated surface, and relief sound-absorbing are attached to the smooth surface elements, for example in the form of tetrahedrons.
The drawing shows a diagram of a sound-absorbing element.
The sound-absorbing element contains a smooth 1 and perforated 2 surfaces, between which a multilayer sound-absorbing structure is placed.
The sound-absorbing structure is made of complex shape and is an alternation of solid sections 3 and hollow sections 4. Solid sections 3, in turn, are formed by smooth prismatic surfaces 5 located perpendicular to smooth 1 and perforated 2 surfaces and fixed to smooth 1 surface, as well as two. associated and inclined, relatively smooth prismatic surfaces 5, surfaces 6 of complex shape having, on the one hand, a smooth surface, and on the other hand, serrated or in oily or portions formed by spherical shape (not shown) surface, the top teeth or projections directed inward of these surfaces, and the surfaces themselves fixed on two perforated surface. Embossed sound-absorbing elements 7 are attached to the smooth surface 1, for example, in the form of tetrahedrons.
A variant is possible when inside the surfaces 6 of complex shape, having on one side a smooth surface and on the other gear surface, a Helmholtz resonator is fixed, made in the form of a spherical surface 9 with bushings 8 with resonant holes diametrically fixed on it.
A material based on aluminum-containing alloys was used as a sound-absorbing material, followed by filling them with titanium hydride or air with a density in the range of 0.5 ... 0.9 kg / m 3 with the following strength properties: compressive strength in the range of 5 ... 10 MPa, tensile strength bending within 10 ... 20 MPa, for example foam aluminum.
As a sound-absorbing material of the second, softer layer, rockwool-type mineral wool or URSA-type mineral wool, or P-75-type basalt wool, or glass wool lined with glass wool, or foamed polymer, such as polyethylene or polypropylene.
The material of the perforated surface is made of solid, decorative vibration-damping materials, for example, agate, antivibrate, and shvim plastic compounds, and the inner surface of the perforated surface facing the sound-absorbing structure is lined with an acoustically transparent material, such as fiberglass type EZ-100 or "Poviden" type polymer.
It is possible that the hollow sections 4 are filled with sound-absorbing material, for example, construction foam.
Sound-absorbing element operates as follows.
Sound energy, passing through a layer of perforated surface 2 and a third layer 8 of a sound-absorbing element made of foamed sound-absorbing material, falls on an intermittent sound-absorbing layer 4 located at the focus of a continuous profiled layer 3, where the primary dissipation of sound energy occurs. A Helmholtz resonator made in the form of a spherical surface 9 with bushings 8 with resonant holes diametrically mounted on it is fixed inside the surfaces 6 of complex shape, having on one side a smooth surface and on the other gear surface. Here, the transition of sound energy into thermal energy (dissipation, energy dissipation), i.e. in the pores of the sound absorber, which are the Helmholtz resonator model, there are energy losses due to friction, which fluctuates with the excitation frequency of the mass of air in the neck of the resonator in the form of bushings 8 with resonant holes on the walls of the bushings, which are the neck of the Helmholtz resonators.
It is possible that the relief sound-absorbing elements 7, made in the form of tetrahedrons attached to a smooth surface 1, are installed with alternating sound-absorbing and resonant elements 10, which are a Helmholtz resonator made in the form of a tetrahedron, with bushings with resonant holes fixed on it.
It is possible that in the prismatic surfaces of 5 solid sections 3 of the sound-absorbing element, with their alternation, resonant elements 11 are placed, which are a Helmholtz resonator made in the form of a rectangular prism, with resonant sleeves 12 and 13 mounted on it, located on opposite sides of a rectangular prisms.

Claims (1)

  1. A sound-absorbing element containing smooth and perforated surfaces, between which a multilayer sound-absorbing structure is placed, the sound-absorbing structure is made in the form of smooth and perforated surfaces, between which a sound-absorbing structure of complex shape is represented, which is an alternation of solid sections and hollow sections, while solid sections in turn, formed by smooth prismatic surfaces located perpendicular to a smooth and perforated surface cores and fixed to a smooth surface, as well as two surfaces of complex shape connected with them and inclined relatively smooth prismatic surfaces, having a smooth surface on one side, characterized in that the surfaces of complex shape on the other hand have serrated, or wavy, or formed by spherical sections the shape of the surface, with the tops of the teeth or protrusions facing inside of these surfaces, the surfaces themselves are fixed on a perforated surface, and attached to a smooth surface efnye absorbing elements, for example in the form of tetrahedrons, wherein the sound-absorbing material as applied alyuminesoderzhaschih material based alloys followed by filling them with air or titanium hydride having a density in the range of 0.5 ... 0.9 kg / m 3 with the following strength properties: strength for compression within 5 ... 10 MPa, bending strength within 10 ... 20 MPa, for example foamed aluminum, or rockwool-type mineral wool, or min, was used as sound-absorbing material of the second, softer layer URSA type cotton wool, or P-75 type basalt wool, or glass wool lined with glass wool, or foamed polymer, such as polyethylene or polypropylene, and the perforated surface material is made of solid, decorative vibration damping materials, such as agate plastic compound, Anti-vibrate ”,“ Shvim ”, the inner surface of the perforated surface facing the sound-absorbing structure, lined with an acoustically transparent material, for example fiberglass type EZ-100 or polymer type“ Powi ” den ”, and the hollow sections are filled with sound-absorbing material, for example, construction foam, with Helmholtz resonator made in the form of a spherical surface with diametrically fixed on it inside surfaces of complex shape, having a smooth surface on the one hand and a gear surface on the other. bushings with resonant holes, while the relief sound-absorbing elements made in the form of tetrahedra attached to a smooth surface are installed with alternating sound-absorbing and resonance of the natural elements, which are the Helmholtz resonator, made in the form of a tetrahedron, with bushings fixed to it with resonant holes, and in the prismatic surfaces of the solid sections of the sound-absorbing element, with their alternation, resonant elements are placed, which are the Helmholtz resonator, made in the form of a rectangular prisms, with resonant sleeves fixed on it, located on opposite sides of a rectangular prism.
RU2017139085A 2017-11-10 2017-11-10 Sound absorbing element RU2663976C1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028239B1 (en) * 1979-05-11 1983-11-09 Ifm-Akustikbyran Ab Sound absorbent
RU2993U1 (en) * 1995-05-18 1996-10-16 Московская государственная текстильная академия им.А.Н.Косыгина Noise-absorbing panel "impulse"
DE102004037260A1 (en) * 2004-07-31 2006-03-23 Südluft Systemtechnik GmbH & Co. KG Sound-absorbing or sound-damping cassette structure and a method for cleaning such
US20110308885A1 (en) * 2008-11-19 2011-12-22 Michele Angelico Anti-noise panel
RU2609482C1 (en) * 2016-01-18 2017-02-02 Олег Савельевич Кочетов Kochetov multilayer combined structure
RU2611649C1 (en) * 2016-01-18 2017-02-28 Татьяна Дмитриевна Ходакова Sound-absorbing element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0028239B1 (en) * 1979-05-11 1983-11-09 Ifm-Akustikbyran Ab Sound absorbent
RU2993U1 (en) * 1995-05-18 1996-10-16 Московская государственная текстильная академия им.А.Н.Косыгина Noise-absorbing panel "impulse"
DE102004037260A1 (en) * 2004-07-31 2006-03-23 Südluft Systemtechnik GmbH & Co. KG Sound-absorbing or sound-damping cassette structure and a method for cleaning such
US20110308885A1 (en) * 2008-11-19 2011-12-22 Michele Angelico Anti-noise panel
RU2609482C1 (en) * 2016-01-18 2017-02-02 Олег Савельевич Кочетов Kochetov multilayer combined structure
RU2611649C1 (en) * 2016-01-18 2017-02-28 Татьяна Дмитриевна Ходакова Sound-absorbing element

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