WO2014148912A1 - A sound barrier material - Google Patents

A sound barrier material Download PDF

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Publication number
WO2014148912A1
WO2014148912A1 PCT/NO2014/000026 NO2014000026W WO2014148912A1 WO 2014148912 A1 WO2014148912 A1 WO 2014148912A1 NO 2014000026 W NO2014000026 W NO 2014000026W WO 2014148912 A1 WO2014148912 A1 WO 2014148912A1
Authority
WO
WIPO (PCT)
Prior art keywords
metallic
sound barrier
barrier material
scatterers
mesh
Prior art date
Application number
PCT/NO2014/000026
Other languages
French (fr)
Inventor
Litian WANG
Rino NILSEN
Alf Egil JENSEN
Hong Wu
Miriam Cebrian GIL
Wang YANFENG
Original Assignee
Østfold University College
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Østfold University College filed Critical Østfold University College
Publication of WO2014148912A1 publication Critical patent/WO2014148912A1/en

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods 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
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/165—Particles in a matrix

Definitions

  • the present invention relates to the field of sound barrier materials with sound damping properties in the audible area.
  • Damping capacity for polymeric materials is very high compared to metallic materials.
  • the present invention comprises a substantially periodic array of structures
  • US Patent application PCT/US2008/086918 discloses a sound barrier comprising a substantially periodic layers structures disposed in a first medium having a first density, the structures being made of a second medium having a second density different from the first density, wherein one of the first and second media is a porous medium other than a porous metal, the porous medium having a porosity, and wherein the other of the first and second media is a viscoelastic or elastic medium.
  • US Patent application PCT/US2008/086918 discloses a sound barrier using a phononic crystal with viscoelastic materials.
  • the structure of the material and individual characteristics of the elements making up the material provides the best sound-absorbing properties, which can be coated or mounted on existing construction due to their moderated physical strength.
  • the invention is a two-dimensional material comprising a host elastomer and multiple metallic scatterers arranged in a repeating cell- structure with a lattice constant inside the host elastomer, wherein the metallic scatterers are fixed on a metallic net/mesh. See figure 1.
  • the present sound barrier material according to the invention has good sound damping properties in the hearing range of humans.
  • the material also can be made flexible, allowing it to be mounted or attached on the construction where sound barriers are needed. This simplifies the planning, construction and maintenance phase, and reduces the associated costs.
  • the thickness of the host elastomer is below 1 cm (one
  • the thickness of the sound barrier material is important for the weight and flexibility of the product. A lower thickness will usually make the material more applicable.
  • the internal structure of the unit cell is important, and the lattice constant is 25 mm or less.
  • the diameter of the metallic scatterers is in the range 50% to 70% of the lattice constant, and a diameter of the holes in the metallic mesh is the range 5% to 10% of the lattice constant.
  • the hardness of the material is of importance for the damping effect.
  • the hardness of the host elastomer is lower than Shore A50.
  • FIG. 1 illustrates the elements making up the material according to an embodiment of the invention in Fig 1.
  • Fig. 2 shows the measurement result of transmission loss of the material samples with different compositions, where the measurement is carried out using the
  • the invention is in an embodiment, as illustrated in Fig. 1, a novel sound barrier material (1) comprising a host elastomer (2) and multiple metallic scatterers (3) arranged in a repeating cell structure with a lattice constant (a) on a metallic mesh (4) inside the host elastomer (2), wherein the metallic scatterers (3) can be either disc, ring, or square with thickness below 2 mm (two millimeters).
  • the metallic scatterers (3) can be made of different metallic materials, e.g.
  • Fig 1 illustrates in a section view that the sound barrier material (1) is composed of unit cells with a lattice constant (a).
  • the cell structure is square or triangular.
  • the sound barrier material (1) has a thickness (t).
  • the lattice constant (a) is 25mm or less.
  • the diameter (d) of the metallic scatterers (3) is in the range 50% to 70% of the lattice constant (a), and a diameter of the holes in the mesh (4) in the range 5% to 10% of the lattice constant (a) according to an embodiment of the invention.
  • the shape of the metallic scatterers will influence the damping capacity of the material.
  • the metallic scatterers (3) are metallic geometrical forms, such as disc, or ring, or square, with thickness below 2 mm (two millimeters).
  • the metallic scatterers (3) are discs, which can secure good adhesion between the mesh (4) and the metallic scatterers
  • the host elastomer (2) has lower than Shore A70.
  • the host elastomer (2) is made of plastic material.
  • plastic material may be either polyurethane, or silicone, or rubber that are resilient, flexible, durable and viscoelastic materials, with certain hardness at the same time are sufficient for achieving the damping effect.
  • the coating elastomer (4) has the hardness lower than Shore A50.
  • the mesh (4) is made of metal.
  • the results for the frequencies between 500 Hz and 3000 Hz can be seen in Fig. 2.
  • the three samples HI, H2, H3 are categorized according to the arrangement of scatterers (3): Sample HI is without scatterers; Sample H2 has scatterers with outer diameter 7.5 mm (seven point five millimeters); Sample H3 has scatterers with outer diameter 10.0 mm (ten millimeters) (See Table 1). The result indicates that the diameter and areal of scatterers plays a central role in enhancing transmission loss.
  • the invention is also a method for the manufacture sound barrier material (1) comprising the following steps;
  • a soft elastomer such as e.g. silicon (SI) or rubbers, may be chosen as host
  • the modulus or hardness can be tuned so that an optimal sound damping can be reached.
  • steel is chosen as scattered material because of its high
  • Figure 2 show the transmission loss for the three samples with steel scatterers specified in Table 1.
  • Table I Specification for the three samples with steel mesh in a hard silicone host material and with flat rings as scatterers.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Building Environments (AREA)

Abstract

A sound barrier material (1) comprising a host elastomer (2) and multiple metallic scatterers (3) arranged in a repeating cell structure with a lattice constant (a) inside said host elastomer (2), wherein said metallic scatterers are attached on a metallic mesh (4).

Description

A SOUND BARRIER MATERIAL
[0001] The present invention relates to the field of sound barrier materials with sound damping properties in the audible area.
[0002] Materials with good damping capacity have numerous applications in noise
control and vibration damping related to many industries. Damping capacity for polymeric materials (e.g. elastomer) is very high compared to metallic materials.
[0003] The present invention comprises a substantially periodic array of structures
disposed in a viscoelastic or elastic medium.
[0004] US Patent application PCT/US2008/086918 (WO 2009/085724 Al) discloses a sound barrier comprising a substantially periodic layers structures disposed in a first medium having a first density, the structures being made of a second medium having a second density different from the first density, wherein one of the first and second media is a porous medium other than a porous metal, the porous medium having a porosity, and wherein the other of the first and second media is a viscoelastic or elastic medium.
[0005] US Patent application PCT/US2008/086918 (WO 2009/085724 Al) discloses a sound barrier using a phononic crystal with viscoelastic materials.
[0006] The structure of the materials described above are not comparable with present invention, because they have uniform layered-structures.
Short summary of the invention
[0007] It is an object of the present invention to disclose a sound barrier material that can be used in the hearing range of humans. The structure of the material and individual characteristics of the elements making up the material provides the best sound-absorbing properties, which can be coated or mounted on existing construction due to their moderated physical strength.
[0008] In an embodiment the invention is a two-dimensional material comprising a host elastomer and multiple metallic scatterers arranged in a repeating cell- structure with a lattice constant inside the host elastomer, wherein the metallic scatterers are fixed on a metallic net/mesh. See figure 1.
[0009] The present sound barrier material according to the invention has good sound damping properties in the hearing range of humans.
[0010] The material also can be made flexible, allowing it to be mounted or attached on the construction where sound barriers are needed. This simplifies the planning, construction and maintenance phase, and reduces the associated costs.
[0011] In an embodiment the thickness of the host elastomer is below 1 cm (one
centimeter). The thickness of the sound barrier material is important for the weight and flexibility of the product. A lower thickness will usually make the material more applicable.
[0012] According to an embodiment of the invention the internal structure of the unit cell is important, and the lattice constant is 25 mm or less.
[0013] Further, in an embodiment the diameter of the metallic scatterers is in the range 50% to 70% of the lattice constant, and a diameter of the holes in the metallic mesh is the range 5% to 10% of the lattice constant.
[0014] The hardness of the material is of importance for the damping effect. In an
embodiment the hardness of the host elastomer is lower than Shore A50. Drawings
[0015] The attached figures illustrate some embodiments of the claimed invention.
[0016] Fig. 1 illustrates the elements making up the material according to an embodiment of the invention in Fig 1.
[0017] Fig. 2 shows the measurement result of transmission loss of the material samples with different compositions, where the measurement is carried out using the
Impedance Tube method.
[0018] With reference to the attached drawings the device and system according to the invention will now be explained in more details.
[0019] The invention is in an embodiment, as illustrated in Fig. 1, a novel sound barrier material (1) comprising a host elastomer (2) and multiple metallic scatterers (3) arranged in a repeating cell structure with a lattice constant (a) on a metallic mesh (4) inside the host elastomer (2), wherein the metallic scatterers (3) can be either disc, ring, or square with thickness below 2 mm (two millimeters).
[0020] The metallic scatterers (3) can be made of different metallic materials, e.g.
aluminum or ferrous metals.
[0021] Fig 1 illustrates in a section view that the sound barrier material (1) is composed of unit cells with a lattice constant (a).
[0022] In an embodiment the cell structure is square or triangular.
[0023] Further, in Fig. 1 it is shown that the sound barrier material (1) has a thickness (t).
According to an embodiment of the invention a thickness (t) of the host elastomer
(2) is below 1 cm (one centimeter).
[0024] It is found that the relationship among the lattice constant (a) and the scatterers (3) and the mesh (4) is important in order to achieve the desired damping capacity. According to an embodiment of the invention the lattice constant (a) is 25mm or less.
[0025] Further, with reference to Fig. 1 illustrating in a section view a single unit cell, the diameter (d) of the metallic scatterers (3) is in the range 50% to 70% of the lattice constant (a), and a diameter of the holes in the mesh (4) in the range 5% to 10% of the lattice constant (a) according to an embodiment of the invention.
[0026] The shape of the metallic scatterers will influence the damping capacity of the material. According to an embodiment of the invention the metallic scatterers (3) are metallic geometrical forms, such as disc, or ring, or square, with thickness below 2 mm (two millimeters).
[0027] According to an embodiment of the invention the metallic scatterers (3) are discs, which can secure good adhesion between the mesh (4) and the metallic scatterers
(3) .
[0028] In construction materials, a certain hardness is required. According to an
embodiment of the invention the host elastomer (2) has lower than Shore A70.
[0029] It has been found that a hardness of at most Shore A70 gives a material the
required mechanical strength, and it has been verified in experiments that this hardness also results in a good damping property of the material.
[0030] According to an embodiment of the invention the host elastomer (2) is made of plastic material. [0031] Such a plastic material may be either polyurethane, or silicone, or rubber that are resilient, flexible, durable and viscoelastic materials, with certain hardness at the same time are sufficient for achieving the damping effect.
[0032] According to an embodiment of the invention the coating elastomer (4) has the hardness lower than Shore A50.
[0033] According to an embodiment of the invention the mesh (4) is made of metal.
[0034] The transmission loss for three samples of sound barrier material has been
investigated. The results for the frequencies between 500 Hz and 3000 Hz can be seen in Fig. 2. The three samples HI, H2, H3 are categorized according to the arrangement of scatterers (3): Sample HI is without scatterers; Sample H2 has scatterers with outer diameter 7.5 mm (seven point five millimeters); Sample H3 has scatterers with outer diameter 10.0 mm (ten millimeters) (See Table 1). The result indicates that the diameter and areal of scatterers plays a central role in enhancing transmission loss.
[0035] According to an embodiment the invention is also a method for the manufacture sound barrier material (1) comprising the following steps;
-arranging the metallic scatterers (3) on the on the metallic mesh (4)
-ruling the metallic scatterers (3) and the metallic mesh (4) into forming laminar structure.
[0036] A soft elastomer, such as e.g. silicon (SI) or rubbers, may be chosen as host
material (2) because of its low modulus which is essential to achieve low frequency band gap. The modulus or hardness can be tuned so that an optimal sound damping can be reached.
[0037] Other soft elastomers can be used, for example, high fire or heat resistant
elastomers.
[0038] In this embodiment steel is chosen as scattered material because of its high
density. In addition it is widely available at low cost. Other non-ferrous metals can also be used.
[0039] To verify the advantages of the sound barrier material according to the invention, a series of tests have been conducted. Figure 2 show the transmission loss for the three samples with steel scatterers specified in Table 1.
T ble
Table I: Specification for the three samples with steel mesh in a hard silicone host material and with flat rings as scatterers.
Rings
Sample 0inner 0outer Thickness
HI NA NA NA
H2 3.2 mm 6.5 mm 0.5mm
H3 5.3 mm 10.0 mm 1.0mm
Steel mesh: Aperture width: 1.25mm
Wire diameter: 0.25mm

Claims

1. A sound barrier material (1) comprising a host elastomer (2) and multiple metallic scatterers (3) arranged in a repeating cell structure with a lattice constant (a) inside said host elastomer (2), wherein said metallic scatterers are attached on a metallic mesh (4). See figure 1
2. Said sound barrier material (1) of claim 1, wherein said cell structure is square or triangular.
3. Said sound barrier material (1) any of the claims claim 1 to 2, wherein said lattice constant is 25 mm or less.
4. Said sound barrier material (1) of claim 3, wherein a diameter (d) of said metallic scatterers (3) is in the range 50% to 70% of said lattice constant (a), and a diameter of the holes in mesh is in the range 5% to 10% of the lattice constant (a).
5. Said sound barrier material (1) any of the claims 1 to 4, wherein said metallic scatterers (3) are discs.
6. Said sound barrier material (1) of claim 5, wherein said metallic scatterers (3) are disc with or without a repeating surface structure in the either side of said metallic scatterers (3).
7. Said sound barrier material (1) of any of the claims 1 to 6, wherein said host elastomer (2) has the hardness lower than Shore A80.
8. Said sound barrier material (1) of claim 7, wherein said host elastomer (2) is made of a plastic material.
9. Said sound barrier material (1) of any of the claims 1 to 8, wherein said metallic mesh (4) is made of wire with diameter less than 1 mm (one millimeter).
10. A method for the manufacture of a sound barrier material (1) comprising the
following steps:
-attaching metal discs (3) on the metallic mesh (4)
-ruling said metallic scatterers (3) with metallic mesh (4) and host (2) together
PCT/NO2014/000026 2013-03-18 2014-03-15 A sound barrier material WO2014148912A1 (en)

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NONO20130396 2013-03-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109119062A (en) * 2018-06-19 2019-01-01 浙江大学 A kind of acoustic resonance condenser lens and its design method
EP3556955A1 (en) * 2018-04-18 2019-10-23 Saint-Gobain Placo Wall with dynamic absorber

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US3421597A (en) * 1964-09-21 1969-01-14 Wiederhold Hermann Sound absorber
US5245141A (en) * 1990-09-03 1993-09-14 Matec Holding Ag Sound-insulating and sound-damping composite structure
US20050109557A1 (en) * 2003-11-21 2005-05-26 Snecma Moteurs Soundproofing panel with beads, and a method of manufacture
US20050194209A1 (en) * 2004-03-05 2005-09-08 Rsm Technologies Limited Sound attenuating structures
CN102237079A (en) * 2010-05-06 2011-11-09 财团法人工业技术研究院 Unit and array structure with sound insulation and shock isolation structure and manufacturing method thereof
US20120061176A1 (en) * 2010-09-10 2012-03-15 The Boeing Company Apparatus and method for providing acoustic metamaterial

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Publication number Priority date Publication date Assignee Title
US3421597A (en) * 1964-09-21 1969-01-14 Wiederhold Hermann Sound absorber
US5245141A (en) * 1990-09-03 1993-09-14 Matec Holding Ag Sound-insulating and sound-damping composite structure
US20050109557A1 (en) * 2003-11-21 2005-05-26 Snecma Moteurs Soundproofing panel with beads, and a method of manufacture
US20050194209A1 (en) * 2004-03-05 2005-09-08 Rsm Technologies Limited Sound attenuating structures
CN102237079A (en) * 2010-05-06 2011-11-09 财团法人工业技术研究院 Unit and array structure with sound insulation and shock isolation structure and manufacturing method thereof
US20120061176A1 (en) * 2010-09-10 2012-03-15 The Boeing Company Apparatus and method for providing acoustic metamaterial

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H. H. HUANG ET AL.: "Wave attenuation mechanism in an acoustic metamaterial with negative mass density", NEW JOURNAL OF PHYSICS, vol. 11, 1 January 2009 (2009-01-01), XP020154288 *
H. ZAO ET AL.: ""Low frequency acoustic absorption of localized resonances: Experimental and theory", JOURNAL OF APPLIED PHYSICS, vol. 107, 27 January 2010 (2010-01-27), XP012133175 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3556955A1 (en) * 2018-04-18 2019-10-23 Saint-Gobain Placo Wall with dynamic absorber
FR3080392A1 (en) * 2018-04-18 2019-10-25 Saint-Gobain Placo DYNAMIC ABSORBER WALL
CN109119062A (en) * 2018-06-19 2019-01-01 浙江大学 A kind of acoustic resonance condenser lens and its design method
CN109119062B (en) * 2018-06-19 2023-07-18 浙江大学 Acoustic resonance focusing lens and design method thereof

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Publication number Publication date
NO334898B1 (en) 2014-07-07
NO20130396A1 (en) 2014-07-07

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