RU2588006C1 - Sound-absorbing composite structure - Google Patents

Sound-absorbing composite structure Download PDF

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Publication number
RU2588006C1
RU2588006C1 RU2015138198/03A RU2015138198A RU2588006C1 RU 2588006 C1 RU2588006 C1 RU 2588006C1 RU 2015138198/03 A RU2015138198/03 A RU 2015138198/03A RU 2015138198 A RU2015138198 A RU 2015138198A RU 2588006 C1 RU2588006 C1 RU 2588006C1
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RU
Russia
Prior art keywords
sound
absorbing
perforated
layer
reflecting
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RU2015138198/03A
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Russian (ru)
Inventor
Мария Олеговна Стареева
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Мария Олеговна Стареева
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Publication date
Application filed by Мария Олеговна Стареева filed Critical Мария Олеговна Стареева
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Publication of RU2588006C1 publication Critical patent/RU2588006C1/en

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Abstract

FIELD: acoustics.
SUBSTANCE: invention relates to a sound-absorbing composite structure. Structure includes upper and lower perforated surfaces, between which sound absorbing element is placed. Latter consists of three layers. First layer is intermittent and composite. Layer consists of alternating sections in form of solid prismatic surfaces. Surfaces are made of sound-absorbing material. On both sides of said surfaces there are hollow shaped sections, profile of which in plane perpendicular to perforated surfaces is a rhombus. Inner walls of rhombus are composed of toothed sound-reflecting surface. Profiled areas are attached to perforated surfaces. Toothed surface is made in form of sound-reflecting surface of material whose sound reflection factor is higher than sound absorption factor. Second layer is a cavity between first and second layers and perforated surfaces. Cavities are filled with sound absorbing material, for example, construction sealing foam. Third layer prevents precipitation of sound-absorbing material and is acoustically transparent, for example from glass fibre EZ-100 or “Poviden” type polymer. Third layer is located between second layer and perforated surfaces.
EFFECT: higher efficiency of sound absorption and reliability of design overall.
4 cl, 1 dwg

Description

The invention relates to industrial acoustics.
The closest technical solution to the technical nature and the achieved result is a sound-absorbing element used as a facing of industrial premises, known from the patent of the Russian Federation No. 2532513 (prototype).
The disadvantage of the technical solution adopted as a prototype is the relatively low noise reduction due to the presence of voids between the layers, where there is no sound absorption between the layers of the sound absorber.
The technical result is an increase in the efficiency of sound attenuation and the reliability of the structure as a whole.
This is achieved by the fact that in a sound-absorbing combined structure containing perforated surfaces between which a sound-absorbing element is placed, the sound-absorbing element consists of three layers, while the first layer is intermittent and combined, consisting of alternating sections in the form of continuous prismatic surfaces made of sound-absorbing material , on both sides of which there are hollow profiled sections whose profile is in a plane perpendicular to the perforated the core consists of a rhombus, the inner walls of which are made in the form of a serrated sound-reflecting surface, and the profiled sections are fixed to perforated surfaces, and the serrated surface is made in the form of a sound-reflecting surface of a material whose sound reflection coefficient is greater than the sound absorption coefficient, while the second the layer is the voids between the first layer and perforated surfaces that are filled with sound-absorbing material, such as building sealing foam, and the third layer prevents the precipitation of sound-absorbing material and is made acoustically transparent, for example of fiberglass type EZ-100, or polymer type "Poviden" and is located between the perforated surfaces.
The drawing shows a diagram of a sound-absorbing combined structure.
The sound-absorbing combined structure is made in the form of an upper 1 perforated surface and a lower 2 perforated surface, between which a sound-absorbing element is made up of three layers, while the first layer is intermittent and combined, consisting of alternating sections in the form of continuous prismatic surfaces 3 made of sound-absorbing material, on both sides of which there are hollow profiled sections 4, the profile of which is in the plane perpendicular to the perforated the surfaces 1 and 2, is a rhombus 6, the inner walls of which are made in the form of a gear sound-reflecting surface 5, and the fixing of the profiled sections 4 is carried out to the perforated surfaces 1 and 2. The gear surface 5 is made in the form of a sound-reflecting surface of a material with a sound reflection coefficient more than the sound absorption coefficient.
The second layer 7 represents the voids between the first layer and the perforated surfaces 1 and 2, which are filled with sound-absorbing material, for example, construction sealing foam, which improves the soundproof properties of the structure as a whole by filling the voids formed by the layers, and also increases the reliability of the structure as a whole during installation it on equipment operating in conditions with increased shock and vibration loads.
The third layer 8 prevents the precipitation of sound-absorbing material and is made acoustically transparent, for example of fiberglass type EZ-100, or polymer type "Poviden" and is located between the second layer 7 and perforated surfaces 1 and 2.
As a material of the sound-reflecting surface of the internal gear surfaces of the first layer, a material based on aluminum-containing alloys was used, 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, bending strength in the range of 10 ... 20 MPa, for example foam aluminum.
As sound-absorbing material of continuous prismatic surfaces 3 of the first layer, rockwool type mineral wool or URSA type mineral wool or P-75 type cotton wool or glass wool lined with glass wool or foamed polymer, such as polyethylene or polypropylene.
The material of the perforated surface 2 is made of solid decorative vibration-damping materials, such as plastic compounds such as "Agate", "Anti-Vibrate", "Shvim".
Sound-absorbing combined design works as follows.
Sound energy, passing through the layers of perforated surfaces 1 and 2, and the second layer 7 of the sound-absorbing element made of foamed sound-absorbing material, falls on solid prismatic surfaces 3, where the sound energy is converted into thermal energy (dissipation, energy dissipation), i.e. in the pores of the sound absorber, which are the Helmholtz resonator model, and there are loss of sound energy due to friction, which fluctuates with the excitation frequency of the mass of air in the mouth of the resonator against the walls of the neck itself, which has the form of a branched network of micropores of the sound absorber, and also gets inside rhomboid voids 6 to gear sound-reflecting surfaces 5, where there is multiple reflection of sound energy and its reduction in the pores of sound-absorbing material of continuous diamond-shaped sections of Nost 5.

Claims (4)

1. A sound-absorbing combined structure comprising upper and lower perforated surfaces between which a sound-absorbing element is placed, characterized in that the sound-absorbing element consists of three layers, the first layer being intermittent and combined, consisting of alternating sections in the form of continuous prismatic surfaces made from sound-absorbing material, on both sides of which there are hollow profiled sections, the profile of which is in the plane perpendicular to the perforated the surface, is a rhombus, the inner walls of which are made in the form of a serrated sound-reflecting surface, and the profiled sections are fixed to perforated surfaces, and the serrated surface is made in the form of a sound-reflecting surface of a material whose sound reflection coefficient is greater than the sound absorption coefficient, while the second layer is the voids between the first layer and perforated surfaces that are filled with sound-absorbing material, for example sealing foam construction, and the third layer prevents precipitation of sound absorbing material and adapted acoustically transparent, for example glass fiber type EG-100, or a polymer type "Poviden", and is located between the second layer and perforated surfaces.
2. The sound-absorbing combined structure according to claim 1, characterized in that a material based on aluminum-containing alloys is used as the material of the gear sound-reflecting surface, followed by filling them with titanium hydride or air with a density in the range 0.5 ... 0.9 kg / m 3 s the following strength properties: compressive strength in the range of 5 ... 10 MPa, bending strength in the range of 10 ... 20 MPa, for example foam aluminum.
3. The sound-absorbing combined structure according to claim 1, characterized in that rockwool type mineral wool, or URSA type mineral wool, or P-75 type basalt wool, is used as the material of continuous prismatic surfaces of the first layer glass wool lined with glass wool, or foamed polymer, for example polyethylene or polypropylene.
4. 3-sound-absorbing combined structure according to claim 1, characterized in that the material of the perforated surface is made of solid decorative vibration-damping materials, for example, plastic compounds such as "Agate", "Anti-vibration", "Shvim".
RU2015138198/03A 2015-09-08 Sound-absorbing composite structure RU2588006C1 (en)

Publications (1)

Publication Number Publication Date
RU2588006C1 true RU2588006C1 (en) 2016-06-27

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507355A (en) * 1969-05-22 1970-04-21 Rohr Corp Multi-layer face material for sound absorptive duct lining material
US4084367A (en) * 1975-11-14 1978-04-18 Haworth Mfg., Inc. Sound absorbing panel
RU2993U1 (en) * 1995-05-18 1996-10-16 Московская государственная текстильная академия им.А.Н.Косыгина Noise-absorbing panel "impulse"
US5681408A (en) * 1993-02-05 1997-10-28 Gencorp Inc. Acoustic lamina wall covering
RU2524730C1 (en) * 2013-07-22 2014-08-10 Олег Савельевич Кочетов Acoustic finishing of production premises
RU2532513C1 (en) * 2013-07-22 2014-11-10 Олег Савельевич Кочетов Sound absorbing element (versions)

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507355A (en) * 1969-05-22 1970-04-21 Rohr Corp Multi-layer face material for sound absorptive duct lining material
US4084367A (en) * 1975-11-14 1978-04-18 Haworth Mfg., Inc. Sound absorbing panel
US5681408A (en) * 1993-02-05 1997-10-28 Gencorp Inc. Acoustic lamina wall covering
RU2993U1 (en) * 1995-05-18 1996-10-16 Московская государственная текстильная академия им.А.Н.Косыгина Noise-absorbing panel "impulse"
RU2524730C1 (en) * 2013-07-22 2014-08-10 Олег Савельевич Кочетов Acoustic finishing of production premises
RU2532513C1 (en) * 2013-07-22 2014-11-10 Олег Савельевич Кочетов Sound absorbing element (versions)

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