RU2655663C2 - Single-piece sound absorber with helical sound absorbing elements - Google Patents

Single-piece sound absorber with helical sound absorbing elements Download PDF

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RU2655663C2
RU2655663C2 RU2014107097A RU2014107097A RU2655663C2 RU 2655663 C2 RU2655663 C2 RU 2655663C2 RU 2014107097 A RU2014107097 A RU 2014107097A RU 2014107097 A RU2014107097 A RU 2014107097A RU 2655663 C2 RU2655663 C2 RU 2655663C2
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sound
perforated
frame
absorbing
rigid
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RU2014107097A
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Russian (ru)
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RU2014107097A (en
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Татьяна Дмитриевна Ходакова
Олег Савельевич Кочетов
Мария Олеговна Стареева
Мария Михайловна Стареева
Анна Михайловна Стареева
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Татьяна Дмитриевна Ходакова
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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 means of reducing noise in industrial and transport facilities. Single piece sound absorber with helical sound-absorbing elements comprises active and reactive acoustic absorbers located on rigid frame, at that, the frame consists of two parts, at that, the lower, reactive part is made in the form of rigid, hollow cylinder, which bottom is connected to support disk connecting it to the support disk, on which the frame upper part is fixed through the resilient damping element, which is made in the form of rigid perforated cylindrical shell with perforated cover and connected to the support disk solid base, cylindrical shell cavity is filled with sound-absorbing material, at that, to the perforated cylindrical shell perforated cover an element is hinged by means of which the frame is fixed to the desired object, and around the rigid perforated cylindrical shell at least one helical sound absorbing element is located, at that, the perforated surfaces have the following perforation parameters: holes diameter – 3÷7 mm, perforation percentage 10 % ÷ 15 %, and holes in perforated surfaces can be made in form of circular, triangular, square, rectangular or rhomboid shaped holes, at that, ratio between the material and the vibration damping coating thicknesses lies in the optimum range of values: 1/(2.5…3.5), or from stainless steel, or galvanized sheet with the thickness of 0.7 mm with the “Pural” type polymeric protective-decorative coating with thickness of 50 mcm, or “Polyester” type with thickness of 25 mcm, or aluminum sheet with thickness of 1.0 mm and coating thickness of 25 mcm, or from hard decorative vibration damping materials.
EFFECT: technical result is an increase in the efficiency of noise attenuation at high frequencies by introducing into a unit acoustic absorber of cavities for Helmholtz resonators that increase efficiency at high frequencies.
1 cl, 1 dwg

Description

The invention relates to noise reduction in industrial and transport facilities.
Known designs of piece sound absorbers made in the form of volumetric parallelepipeds, cubic, conical, the cavities of which are filled with sound-absorbing material [1, 2, 3, 4]. Currently, fibrous sound absorbers are the most common in construction practice.
The disadvantages of the known piece sound absorbers are the relatively low efficiency at low and medium frequencies, and they do not meet the increased requirements for room design.
Known conical piece sound absorber according to the patent of the Russian Federation No. 22822004 [5], consisting of a rigid frame suspended by hooks on cables to the ceiling of the industrial building with sound-absorbing material located inside the frame wrapped with mesh nylon fabric, the frame is made in the form of a cone attached to it the lower flange with a hemisphere also containing sound-absorbing material wrapped in a mesh nylon fabric or fiberglass, and filling with sound-absorbing material can be as with air cavities and located on the periphery of the hemisphere, as well as within it in a checkerboard pattern on the three coordinate planes.
Its disadvantage is the relatively low efficiency of sound attenuation at high frequencies due to the lack of sound-reflecting layers that perform sound insulation functions at high frequencies.
Known cylindrical resonant piece sound absorber according to the patent of the Russian Federation No. 23033679 [6], consisting of a rigid frame suspended by hooks on cables to the ceiling of the industrial building with a sound-absorbing material located inside the frame wrapped in a mesh nylon fabric, the frame is made cylindrical in the form of a perforated round glass and lids, inside of which is located a central rod rigidly fixed to the axis of the glass, on which round partitions are mounted with the possibility of their fixation, inside one of which is a sound-absorbing material wrapped in a mesh nylon fabric.
The disadvantage is the relatively low noise attenuation efficiency at low frequencies due to the cramped dimensions for placing resonant cameras.
Known cubic piece sound absorber according to the patent of the Russian Federation No. 2334062 [7], consisting of a rigid frame suspended by hooks on cables to the ceiling of the industrial building with a sound-absorbing material located inside the frame wrapped in mesh nylon fabric, the frame is made in the form of two cubic surfaces, one of which - external - is perforated, and the other - internal - is acoustically transparent, and the sound-absorbing material wrapped in a mesh nylon fabric is located in the gap between the frame themselves, which are interconnected by means of resonance inserts of different diameters, and the inner cavity is divided by a partition into two resonant cavities, one of which is filled with a sound absorber.
The disadvantage is the relatively low efficiency of sound attenuation at high frequencies due to the lack of sound-reflecting layers that perform the functions of sound insulation at high frequencies.
Known volumetric piece sound absorbers according to the patent of the Russian Federation No. 2354786 [8] and the Russian Federation No. 2485256 [9], consisting of a rigid frame suspended on a fastener to the ceiling of the industrial building, the frame is made with sound-absorbing material wrapped in an acoustically transparent material.
Their disadvantage is the relatively low noise attenuation efficiency at high frequencies, due to the lack of Helmholtz resonators.
The closest technical solution in terms of technical nature and the achieved result is a piece sound absorber according to the patent of the Russian Federation No. 2485256 [10], containing a rigid perforated frame, inside which a sound-absorbing material is placed, the frame is made of the lower part of the conical shape with a cover and the upper part of the cylindrical shape, which is attached to the cover of the lower part of the perforated frame by means of a vibration damping pad, which allows damping high-frequency vibrations, while to the upper part is cylindrical about the perforated frame, the element is pivotally fixed by means of which the frame is attached to the desired object, for example, the ceiling of the production room, and the cavities of the lower and upper parts of the perforated frame are filled with sound-absorbing materials of different densities, and at least one sound-absorbing screw is located around the upper part of the cylindrical shape of the perforated frame piece absorber element made in the form of a cylindrical coil spring from a dense non-combustible sound-absorbing about the material.
The disadvantage of this piece sound absorber is the relatively low noise reduction efficiency at low and medium frequencies due to the lack of volume cavities for Helmholtz resonators and cavities filled with a sound absorber, i.e. absorbers of various densities.
EFFECT: increased efficiency of sound attenuation at high frequencies by introducing volume cavities for Helmholtz resonators into a piece sound absorber, which increase efficiency at high frequencies.
This is achieved by the fact that in a piece of sound absorber with screw sound-absorbing elements, the frame consists of two parts, while the lower, reactive part is made in the form of a rigid, hollow cylinder, the bottom of which is connected to a support disk connecting it to a support disk, on which through elastic-damping the element is fixed to the upper part of the frame, which is made in the form of a rigid perforated cylindrical shell with a perforated cover and a solid base connected to the supporting disk, the cavity of the cylindrical shell the ki is filled with sound-absorbing material, and the upper and lower parts are connected by means of an elastic damping element that allows damping high-frequency vibrations, while the element is pivotally fixed to the perforated cover of the perforated cylindrical shell, by means of which the frame is attached to the desired object, for example, to the ceiling of the production room, and around at least one screw sound-absorbing element is arranged in a rigid perforated cylindrical shell. a frame in the form of a cylindrical coil spring, covering it, and resting on a support disk, wherein the cylinder cavity of the reactive part of the frame is hermetically closed by a support disk with at least one hole that functions as the neck of the Helmholtz resonator, which is formed together with the cylinder cavity and around the hollow cylinder at least one screw sound-absorbing element is located, made in the form of a cylindrical coil spring, covering a hollow cylinder, and abutting against the supporting discs.
The drawing shows a diagram of a piece of sound absorber with screw sound absorbing elements.
A piece sound absorber with screw sound-absorbing elements contains active and reactive sound absorbers located on a rigid frame 1. The frame 1 consists of two parts, the lower reactive part 7 made in the form of a rigid, hollow cylinder 8, the bottom of which is connected to the supporting disk 11 connecting it with the support disk 6, on which the upper part 2 of the frame 1 is fixed through an elastic damping element 5.
The upper, active, part 2 is made in the form of a rigid perforated cylindrical shell with a perforated lid and a solid base connected to the supporting disk 6. The cavity of the cylindrical shell is filled with sound-absorbing material, and the connection of the upper and lower parts is made by means of an elastic damping element 5, which allows damping high-frequency vibrations. At the same time, an element is pivotally fixed to the perforated cover of the perforated cylindrical shell by means of which the frame is attached to the desired object, for example, to the ceiling of the production room. Around the rigid perforated cylindrical shell is at least one screw sound-absorbing element 3, made in the form of a cylindrical helical spring, covering it, and resting on the supporting disk 6.
The cavity of the cylinder 8 of the reactive part of the frame is hermetically closed by a support disk 10 with at least one hole 9, which serves as the neck of the Helmholtz resonator, which is formed together with the cavity of the cylinder 8. Around the hollow cylinder 8 is located at least one screw sound-absorbing element 4, made in shape in the form of a cylindrical coil spring, covering a hollow cylinder 8, and abuts against the supporting discs 10 and 11.
The screw sound-absorbing element 3 can be made in the form of a hollow screw sound-absorbing element formed by the external and internal screw surfaces forming a cavity, while the space formed by the external and internal screw surfaces is filled with sound-absorbing material with a density lower than that of the screw sound-absorbing element.
Perforated surfaces have the following perforation parameters: the diameter of the holes is 3 ÷ 7 mm, the percentage of perforation is 10% ÷ 15%, and the holes in the perforated surfaces can be made in the form of holes of a round, triangular, square, rectangular or rhomboid profile, while in the case of non-circular holes, the maximum diameter of a circle inscribed in a polygon should be considered as a conditional diameter, and structural materials applied to their surface are used as the material of perforated surfaces on one or two sides of a layer of soft vibration-damping material, for example, VD-17 mastic, or “Gerlen-D” type material, while the ratio between the thicknesses of the material and the vibration-damping coating lies in the optimal range of values: 1 / (2.5 ... 3, 5) either stainless steel or a galvanized sheet with a thickness of 0.7 mm with a polymer protective and decorative coating of the Pural type with a thickness of 50 μm, or Polyester with a thickness of 25 μm, or an aluminum sheet with a thickness of 1.0 mm and a coating thickness of 25 microns, or from solid, decorative vibration damping materials, for example, plastic compounds such as "Agate", "Anti-Vibrate", "Shvim".
As sound absorbing material, slabs made of rockwool basalt mineral wool or URSA mineral wool or P-75 basalt wool or glass wool lined with glass wool are used as sound absorbing material, and the sound-absorbing element is lined with acoustically transparent material over its entire surface , for example, fiberglass type EZ-100 or polymer type "poviden."
As the sound-absorbing material, a porous sound-absorbing material is used, for example, foam aluminum, or cermets, or a shell rock with a degree of porosity in the range of optimal values: 30–45%, or metal foam, or a material in the form of pressed crumbs from solid vibration-damping materials, for example elastomer, polyurethane, or plastic compound of the type "Agate", "Anti-Vibrate", "Shvim", moreover, the size of the fractions of the crumbs lies in the optimal range of values: 0.3 ... 2.5 mm, and porous mines can also be used natural piece materials, such as pumice, vermiculite, kaolin, slag with cement or another binder, or synthetic fibers, while the surface of the fibrous absorbers is treated with special porous air-permeable paints, such as Acutex T, or coated with breathable fabrics or non-woven materials, for example, Lutrasil.
Piece sound absorber with screw sound absorbing elements operates as follows.
Sound waves propagating at an industrial or transport facility interact with sound-absorbing material located in the cavity of the perforated cylindrical shell of the active part 2 of the frame 1, as well as with screw sound-absorbing elements 3 and 4 located in the upper, active, part 2 and lower, reactive, part 7, suppressing noise at medium and high frequencies, respectively.
The connection of the upper 2 and lower 7 parts of the frame by means of an elastic damping element 5 allows you to damp high-frequency vibrations that can be emitted by a rigid frame, which allows it to be used to reduce noise on transport objects. Sound absorption at medium and high frequencies occurs due to the acoustic effect, built on the principle of Helmholtz resonators, formed by the air cavity of cylinder 8 with a hole 9, which serves as the neck of the Helmholtz resonator. In this case, the suppression of sound vibrations in the required sound frequency range is carried out, as a rule, as follows: large volumes of the cavity of the cylinder 8 are used to suppress noise in the low-frequency range, and small ones in the medium and high frequencies. The interaction of sound waves with screw sound absorbing elements 3 and 4 leads to additional sound attenuation in the high frequency range, and the implementation of a sound absorber from non-combustible materials makes the design fireproof.
Information sources
1. Kochetov O.S., Sazhin B.S. Noise and vibration reduction in production: theory, calculation, technical solutions. M .: MSTU im. A.N. Kosygina, 2001 .-- 319 p. (Fig. P.III.10, p. 263).
2. Kochetov OS Textile vibroacoustics. Textbook for universities. M .: MSTU im. A.N. Kosygina, the group "Sauvage Bevo" 2003. - 191 p. (Fig. A.2, p. 176).
3. Kochetov OS Laboratory workshop on industrial sanitation. Textbook for universities. M .: MSTU im. A.N. Kosygina, the group "Sovezh Bevo" 2004. - 168 p. (Fig.6.6, p. 120).
4. Kochetov O.S. Sound-absorbing structures to reduce noise in the workplace of industrial premises. The journal "Occupational Safety in Industry", No. 11, 2010, pp. 46-50. (fig. 1; p. 48 and fig. 2; p. 48).
5. Kochetov O.S., Kochetova M.O., Khodakova T.D., Elin A.M. Conical piece sound absorber // Patent for invention No. 2282004, publ. 08/20/2006, bull. Number 23.
6. Kochetov O.S., Kochetova M.O., Khodakova T.D. Cylindrical resonant piece sound absorber // Patent for invention No. 2303679, publ. July 27, 2007, bull. No. 21.
7. Kochetov O.S., Kochetova M.O., Khodakova T.D. Cubic piece sound absorber // Patent for invention No. 2334062, publ. September 20, 2008, bull. No. 26.
8. Kochetov O.S., Kochetova M.O., Kochetov S.S., Kochetov Sergey Sergeevich. Volumetric piece sound absorber // Patent for invention No. 2354786, publ. 05/10/2009, bull. No. 13.
9. Kochetov O.S. Piece sound absorber // Patent for invention No. 2485256, publ. 06/20/2013, bull. Number 17.
10. Kochetov O.S., Stareeva M.O. Piece sound absorber // RF patent for the invention No. 2495202, publ. 10/10/2013, bull. No. 28.

Claims (1)

  1. Piece sound absorber with screw sound-absorbing elements, containing active and reactive type sound absorbers placed on a rigid frame, characterized in that the frame consists of two parts, while the lower, reactive part is made in the form of a rigid, hollow cylinder, the bottom of which is connected to the support disk connecting it with a support disk, on which the upper part of the frame is fixed through an elastic damping element, which is made in the form of a rigid perforated cylindrical shell with perforated cr with a neck and a solid base connected to the support disk, the cavity of the cylindrical shell is filled with sound-absorbing material, and the connection of the upper and lower parts is made by means of an elastic damping element that allows damping high-frequency vibrations, while the element is secured to the perforated cover of the perforated cylindrical shell by which the frame is attached to the desired object, such as the ceiling of the production room, and around a rigid perforated cylindrical casing and at least one screw sound-absorbing element is located, made in the form of a cylindrical coil spring, covering it, and resting on a support disk, the cylinder cavity of the reactive part of the frame being hermetically closed by a support disk with at least one hole that serves as the neck of the Helmholtz resonator which is formed together with the cylinder cavity, and at least one screw sound-absorbing element is arranged around the hollow cylinder, made in the form of a cylindrical wine a spring, covering the hollow cylinder, and abutting in the support discs, while the perforated surfaces have the following perforation parameters: hole diameter - 3 ÷ 7 mm, perforation percentage 10% ÷ 15%, and holes in the perforated surfaces can be made in the form of round holes , triangular, square, rectangular or rhomboid profile, while in the case of non-circular holes, the conditional diameter should be considered as the maximum diameter of the circle inscribed in the polygon, and as the material of the perforations structural surfaces with applied on their surface from one or two sides of a layer of soft vibration-damping material, such as mastic VD-17, or material type "Gerlen-D", the ratio between the thicknesses of the material and vibration-damping coating lies in the optimal range of values: 1 / (2.5 ... 3.5), or stainless steel, or galvanized sheet 0.7 mm thick with a polymer protective and decorative coating of the Pural type 50 microns thick, or Polyester 25 microns thick, or aluminum sheet 1.0 mm thick and t with a coating thickness of 25 microns, or from solid, decorative vibration damping materials, for example, plastic compounds such as "Agate", "Anti-Vibrate", "Shvim".
RU2014107097A 2014-02-26 2014-02-26 Single-piece sound absorber with helical sound absorbing elements RU2655663C2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215225A (en) * 1961-11-29 1965-11-02 Korfund Dynamics Corp Laminated acoustic panels with outer metal layers, fibrous core and viscoelastic damping layer
SU1218019A1 (en) * 1973-10-04 1986-03-15 Всесоюзный Научно-Исследовательский Институт Теплоизоляционных И Акустических Строительных Материалов И Изделий Acoustic module
SU1689548A1 (en) * 1988-06-22 1991-11-07 Le Elektrotekh Inst Acoustic panel
FR2834738A1 (en) * 2002-01-15 2003-07-18 Euramax Ind Sa Soundproofing panel for roofs or partitions has core of polymer foam or extruded plastic material and thin elastomer layer
RU2485256C2 (en) * 2009-03-25 2013-06-20 Олег Савельевич Кочетов Single-piece sound absorber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215225A (en) * 1961-11-29 1965-11-02 Korfund Dynamics Corp Laminated acoustic panels with outer metal layers, fibrous core and viscoelastic damping layer
SU1218019A1 (en) * 1973-10-04 1986-03-15 Всесоюзный Научно-Исследовательский Институт Теплоизоляционных И Акустических Строительных Материалов И Изделий Acoustic module
SU1689548A1 (en) * 1988-06-22 1991-11-07 Le Elektrotekh Inst Acoustic panel
FR2834738A1 (en) * 2002-01-15 2003-07-18 Euramax Ind Sa Soundproofing panel for roofs or partitions has core of polymer foam or extruded plastic material and thin elastomer layer
RU2485256C2 (en) * 2009-03-25 2013-06-20 Олег Савельевич Кочетов Single-piece sound absorber

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