RU2646241C1 - Sound-absorbing element of combined type - Google Patents

Sound-absorbing element of combined type Download PDF

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Publication number
RU2646241C1
RU2646241C1 RU2017108915A RU2017108915A RU2646241C1 RU 2646241 C1 RU2646241 C1 RU 2646241C1 RU 2017108915 A RU2017108915 A RU 2017108915A RU 2017108915 A RU2017108915 A RU 2017108915A RU 2646241 C1 RU2646241 C1 RU 2646241C1
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RU
Russia
Prior art keywords
sections
sound
prismatic
perforated
resonant
Prior art date
Application number
RU2017108915A
Other languages
Russian (ru)
Inventor
Олег Савельевич Кочетов
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Олег Савельевич Кочетов
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Priority to RU2017108915A priority Critical patent/RU2646241C1/en
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Publication of RU2646241C1 publication Critical patent/RU2646241C1/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
    • 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
    • E04B2001/8423Tray or frame type panels or blocks, with or without acoustical filling
    • E04B2001/8433Tray or frame type panels or blocks, with or without acoustical filling with holes in their face
    • 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
    • E04B2001/8457Solid slabs or blocks
    • E04B2001/8476Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/8485Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element the opening being restricted, e.g. forming Helmoltz resonators

Abstract

FIELD: acoustics.
SUBSTANCE: invention relates to industrial acoustics and can be used for machine drive noise reduction, lining of manufacturing facilities and in other sound-absorbing structures. Sound-absorbing element of a combined type contains a smooth and perforated surface, between which a layer of sound-absorbing material of complex shape is located. Layer of complex shape is an alternation of solid sections and hollow sections. Hollow sections are formed by prismatic surfaces with cross-sections parallel to plane of drawing, parallelogram shape, which inner surface have toothed or wavy structure. Tops of the teeth face the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated walls. Hollow cavities formed by prismatic surfaces are filled with a sound absorber, and between a smooth surface and solid sections of a layer of sound-absorbing material of a complex shape, as well as between the perforated surface and solid sections, there are resonant plates with resonant inserts performing the functions of the neck of Helmholtz resonators. In the internal cavities of solid sections, resonance chambers with resonant inserts that perform the functions of the necks of the Helmholtz resonators are located. Resonance chambers by means of resonance inserts are connected to cavities located between smooth and perforated surfaces and solid sections connected to prismatic surfaces of hollow sections, and the internal cavities of hollow sections formed by prismatic surfaces having a form of a parallelogram in the section parallel to the plane of the drawing have resonant chambers with resonant inserts that perform the functions of the necks of the Helmholtz resonators. Resonance chambers are connected by means of resonance inserts to cavities located between the smooth and perforated surfaces and solid sections connected to the prismatic surfaces of the hollow sections.
EFFECT: technical result consists in increasing the efficiency of sound attenuation and the reliability of the structure as a whole.
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 to the technical nature and the achieved result is a sound-absorbing element used as a facing of industrial premises, known from the RF patent No. 2463412 (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 reliability of the structure as a whole.
This is achieved by the fact that in a sound-absorbing element of a combined type containing smooth and perforated surfaces, between which a layer of sound-absorbing material of complex shape is located, the layer of complex shape is an alternation of solid sections and hollow sections, and the hollow sections are formed by prismatic surfaces having a parallel section in cross section the plane of the drawing, the shape of a parallelogram, the inner surfaces of which have a toothed structure, with the tops of the teeth facing inward the surface of the surface, and the edges of the surface are mounted respectively on the smooth and perforated walls, the cavities of the hollow sections formed by the surface are filled with sound absorbers, and between the smooth surface and the continuous sections of the layer of sound-absorbing material of complex shape, as well as between the perforated surface and the continuous sections, resonant plates with resonant inserts that serve as the necks of Helmholtz resonators.
The drawing shows a diagram of a sound-absorbing element of a combined type.
The sound-absorbing element of the combined type contains a smooth 1 and perforated 2 surfaces, between which there is a layer of sound-absorbing material of complex shape, which is an alternation of solid sections 3 and hollow sections 5, and the hollow sections 5 are formed by prismatic surfaces having a parallelogram shape in cross section parallel to the plane of the drawing , the inner surfaces of which have a gear structure 6, or wavy, or a surface with spherical surfaces (not shown in the drawing o). The cavities 4 formed by the smooth 1 and perforated 2 surfaces, between which a layer of sound-absorbing material of complex shape is located, are filled with a sound absorber. In this case, the tops of the teeth face the inside of the prismatic surfaces, and the edges of the prismatic surfaces are fixed respectively on a smooth 1 and perforated 2 walls. The cavities 7 of the hollow sections 5 formed by prismatic surfaces are filled with construction foam. Between a smooth 1 surface and solid sections 3 of a layer of sound-absorbing material of complex shape, as well as between a perforated 2 surface and solid sections 3, there are resonant plates 8 and 9 with resonant inserts 10 that serve as the neck of the Helmholtz resonators.
As a sound-absorbing material of the first, more rigid 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.
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.
Sound-absorbing element of a combined type works as follows. Sound energy, passing through a layer of perforated surface 2 and a combined sound-absorbing layer of complex shape, decreases, since the transition of sound energy into thermal energy (dissipation, energy dissipation) occurs, 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 resonator neck against the walls of the neck itself, which has the form of an extensive network of micropores of the sound absorber. Between a smooth 1 surface and solid sections 3 of a layer of sound-absorbing material of complex shape, as well as between a perforated 2 surface and solid sections 3, there are resonant plates 8 and 9 with resonant inserts 10 that serve as the neck of the Helmholtz resonators.
Resonance holes 10 (inserts) located in the resonant plates 8 and 9, serve as the neck of the Helmholtz resonators, the frequency band of the damping of sound energy of which is determined by the diameter and number of resonant holes 10.
It is possible that in the internal cavities of the solid sections 3 there are resonant chambers 13 with resonant inserts 11.12 that serve as the necks of Helmholtz resonators, while the resonant chambers 13 are connected to the cavities located between smooth 1 and perforated 2 surfaces by means of resonant inserts 11,12 and solid sections 3 connected to the prismatic surfaces of the hollow sections 5.
It is possible that in the internal cavities 7 of the hollow sections 5 formed by prismatic surfaces having a parallelogram shape in cross section parallel to the plane of the drawing, there are resonance chambers 14 and 16 with resonant inserts 15.17 that serve as the neck of Helmholtz resonators, while the resonant chambers 14 and 16 by means of resonant inserts 15.17 are connected to cavities located between smooth 1 and perforated 2 surfaces and solid sections 3 connected to prismatic surfaces and hollow sections 5.

Claims (1)

  1. A sound-absorbing element of a combined type containing smooth and perforated surfaces, between which a layer of sound-absorbing material of complex shape is located, characterized in that the layer of complex shape is an alternation of solid sections and hollow sections, the hollow sections being formed by prismatic surfaces having a section parallel to the plane of the drawing , the shape of a parallelogram, the inner surfaces of which have a toothed structure, with the tops of the teeth facing the inside of the prism surfaces, and the edges of the prismatic surfaces are fixed respectively on the smooth and perforated walls, and the cavities of the hollow sections formed by the prismatic surfaces are filled with sound absorbers, and between the smooth surface and the continuous sections of the layer of sound-absorbing material of complex shape, as well as between the perforated surface and the continuous sections, resonant plates with resonant inserts that serve as the neck of the Helmholtz resonators, while in the internal in the cavities of the solid sections there are resonant chambers with resonant inserts that serve as the necks of the Helmholtz resonators, and the resonant chambers are connected through cavities between the smooth and perforated surfaces and the solid sections connected to the prismatic surfaces of the hollow sections, and in the internal cavities hollow sections formed by prismatic surfaces having a section in parallel to the plane of the drawing in parallel frame, there are resonant chambers with resonant inserts that serve as the necks of Helmholtz resonators, while the resonant chambers are connected through cavities located between smooth and perforated surfaces and solid sections connected to the prismatic surfaces of hollow sections.
RU2017108915A 2017-03-17 2017-03-17 Sound-absorbing element of combined type RU2646241C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3337090A1 (en) * 1983-10-12 1985-05-02 Martin 3000 Hannover Holzlehner Suspension element for sliding ceilings
RU2547519C1 (en) * 2014-02-26 2015-04-10 Олег Савельевич Кочетов Kochetov's acoustic absorber of combined type
RU2561389C1 (en) * 2014-02-17 2015-08-27 Олег Савельевич Кочетов Sound-absorbing structure
RU2583448C2 (en) * 2014-09-16 2016-05-10 Олег Савельевич Кочетов Kochetov sound-absorbing element
RU2613061C1 (en) * 2016-01-18 2017-03-15 Олег Савельевич Кочетов Sound-absorbing element of kochetov with resonant inserts

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3337090A1 (en) * 1983-10-12 1985-05-02 Martin 3000 Hannover Holzlehner Suspension element for sliding ceilings
RU2561389C1 (en) * 2014-02-17 2015-08-27 Олег Савельевич Кочетов Sound-absorbing structure
RU2547519C1 (en) * 2014-02-26 2015-04-10 Олег Савельевич Кочетов Kochetov's acoustic absorber of combined type
RU2583448C2 (en) * 2014-09-16 2016-05-10 Олег Савельевич Кочетов Kochetov sound-absorbing element
RU2613061C1 (en) * 2016-01-18 2017-03-15 Олег Савельевич Кочетов Sound-absorbing element of kochetov with resonant inserts

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
БОГОЛЕПОВ И.И. Промышленная звукоизоляция. Л.: Судостроение, 1986, всего 368 с., с.290-309. *

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