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WO2012012044A2 - Système d'absorption phonique et son procédé de fabrication - Google Patents

Système d'absorption phonique et son procédé de fabrication Download PDF

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Publication number
WO2012012044A2
WO2012012044A2 PCT/US2011/040497 US2011040497W WO2012012044A2 WO 2012012044 A2 WO2012012044 A2 WO 2012012044A2 US 2011040497 W US2011040497 W US 2011040497W WO 2012012044 A2 WO2012012044 A2 WO 2012012044A2
Authority
WO
WIPO (PCT)
Prior art keywords
sound absorbing
backing airspace
airspace
backing
perforated substrate
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2011/040497
Other languages
English (en)
Other versions
WO2012012044A3 (fr
Inventor
Norihito Shibahara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
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 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of WO2012012044A2 publication Critical patent/WO2012012044A2/fr
Publication of WO2012012044A3 publication Critical patent/WO2012012044A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/046—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, 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
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0292—Polyurethane fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/06—Open cell foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, 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
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, 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
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/8485—Solid 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

Definitions

  • the present invention relates to a sound absorbing system.
  • the present invention also relates to a method for manufacturing a sound absorbing system.
  • predetermined volume is arranged behind a board having through holes (i.e., a perforated board).
  • Patent Document 1 discloses a sound absorbing structure including a laminated body which includes at least two layers having different air permeability and a backing airspace, wherein a fiber aggregate is used in combination with a perforated board having a
  • Patent Document 1 describes that "A total thickness of the laminated body according to the present invention has to be in a range between 0.5-20 mm. When the total thickness of the laminated board is less than 0.5 mm, the laminated board as a whole appears to be a single board and the sound absorbing properties are hardly exhibited. Conversely, when the total thickness of the laminated board exceeds 20 mm, the Helmholtz sound absorbing mechanism turns into a porous sound absorbing mechanism and, as result, it becomes difficult to ensure the intended sound absorbing properties in a low frequency region" and "an average thickness of the backing airspace has to be in a range between 0-40 mm. This range results from a constraint on layout of car components.
  • Patent Document 2 discloses a car interior trim component having sound absorbing properties including a substrate that is attached to an interior side of a car body panel via a backing airspace, a skin that is disposed on a surface of the component, and a low density nonwoven fabric that is arranged between the substrate and the skin and that acts as a spring for a panel vibration type sound absorbing function of the skin.
  • Patent Document 2 describes that "Because a backing airspace 30 is provided between a roof panel 20 and a substrate 11, this trim component has sound absorbing properties that can reduce a sound level, in particular, in a low frequency region due to panel vibration (membrane vibration) of substrate 11" and "In addition to the sound absorbing properties inherent to the substrate, the sound absorbing effect due to the panel vibration of the skin and a porous sound absorbing effect by the low density nonwoven fabric are synergistically exhibited, so that the sound level can be effectively reduced in a wide frequency range from a low frequency region to a high frequency region".
  • Patent Document 2 describes that materials for the substrate are "materials with appropriate shape retention and without breathability, such as a PPO (polyphenylene oxide) resin sheet and corrugated cardboard” as well as “materials with sound absorbing properties such as urethane and resin felt.”
  • materials for the substrate are "materials with appropriate shape retention and without breathability, such as a PPO (polyphenylene oxide) resin sheet and corrugated cardboard” as well as “materials with sound absorbing properties such as urethane and resin felt.”
  • the present invention provides a sound absorbing system including a breathable material and an airspace arranged behind the breathable material, which can ensure that the airspace has a size necessary to achieve intended sound absorbing properties even when there is a dimensional constraint on a system installation space.
  • the present invention also provides a method for manufacturing a sound absorbing system including a breathable material and an airspace arranged behind the breathable material, which can ensure that the airspace has a size necessary to achieve intended sound absorption coefficient-frequency characteristics even when there is a dimensional constraint on a system installation space.
  • a sound absorbing system comprising a breathable surface layer; a first backing airspace adjacent to the surface layer; a perforated substrate with a through hole and adjacent to the first backing airspace; and a second backing airspace communicated with the first backing airspace via the through hole of the perforated substrate.
  • a method for manufacturing a sound absorbing system comprising providing a sound absorbing member including a breathable surface layer and a first backing airspace adjacent to the surface layer; providing a perforated substrate with a through hole connected to a second backing airspace in a fluidic communicating manner; and attaching the sound absorbing member to the perforated substrate, and communicating the first backing airspace to the second backing airspace via the through hole of the perforated substrate.
  • a method for manufacturing a sound absorbing system comprising providing a breathable surface layer; providing a first backing airspace; providing a perforated substrate with a through hole connected to a second backing airspace in a fluidic communicating manner; and attaching the first backing airspace to the perforated substrate, attaching the surface layer to the first backing airspace, and communicating the first backing airspace to the second backing airspace via the through hole of the perforated substrate.
  • the sound absorbing system even when the first backing airspace does not have a size necessary to achieve intended sound absorbing properties, the first backing airspace is communicated with the second backing airspace via the through hole of the perforated substrate and, due to the existence of the second backing airspace, intended sound absorbing properties can be achieved without increasing the size of the first backing airspace. Consequently, even when the sound absorbing system is installed in a vehicle or building that has a dimensional constraint on a system installation space, the sound absorbing system can be installed while the airspaces (first and second airspaces) of the size necessary to achieve the intended sound absorbing properties within the dimensional constraint. As a result, the acoustic characteristics of the system installation space can be improved.
  • the structural part that includes the perforated substrate having the through hole and the second backing airspace that is connected to the through hole in a fluidic communicating manner can be employed and the sound absorbing member (or, in other words, surface layer and the first backing airspace) that is provided separately can be attached to the structural part to install the sound absorbing system.
  • the sound absorbing member or, in other words, surface layer and the first backing airspace
  • the size may be ensured by adding the second backing airspace.
  • the intended sound absorbing properties in particular, the sound absorption coefficient-frequency characteristics
  • the intended sound absorbing properties can be achieved due to the existence of the second backing airspace that is originally provided in the vehicle or building, without increasing the size of the first backing airspace.
  • FIG. 1 A cross-sectional view schematically illustrating a sound absorbing system according to an embodiment of the present invention.
  • FIG. 2 A perspective view schematically illustrating the sound absorbing system of Fig. 1.
  • FIGs. 3(a) - 3(f) Diagrams illustrating a sound absorbing system manufacturing method according to an embodiment of the present invention for manufacturing the sound absorbing system of Fig. 1.
  • FIG. 4 A cross-sectional view schematically illustrating a sound absorbing system according to a modification.
  • FIG. 5 A cross-sectional view schematically illustrating a sound absorbing system according to another modification.
  • FIG. 6 A cross-sectional view schematically illustrating a sound absorbing system according to yet another modification.
  • FIGs. 7(a) and 7(b) Perspective views each illustrating an appearance of a surface layer possessed by the sound absorbing system of Fig. 6. Modes for Carrying Out the Invention
  • a sound absorbing system including a breathable material and an airspace arranged behind the breathable material, it is desired to ensure that the airspace has a dimension necessary to achieve intended sound-absorbing properties, even when there is a dimensional constraint on a system installation space.
  • Figs. 1 and 2 illustrate a sound absorbing system 10 according to an embodiment of the present invention.
  • Sound absorbing system 10 can be installed in an interior or exterior of a vehicle or building, although the use of the sound absorbing system of the present invention is not limited to these applications.
  • Sound absorbing system 10 includes a breathable surface layer 12, a first backing airspace 14 adjacent to surface layer 12, a perforated substrate 16 adjacent to first backing airspace 14, and a second backing airspace 18 communicated with first backing airspace 14 through perforated substrate 16.
  • Surface layer 12 is an outermost layer of sound absorbing system 10. This layer propagates a sound to be absorbed between an external environment of sound absorbing system 10 and first backing airspace 14.
  • Surface layer 12 is formed of inherently breathable materials such as fabrics, breathable resin films and open cell foams.
  • Surface layer 12 may be formed of a porous material that singly has the sound absorbing properties or a combination of a plurality of different materials.
  • surface layer 12 is formed as a sheet- like member having a predetermined thickness and it has an outer surface 12a on which the sound to be absorbed is incident and an inner surface 12b at the side opposite thereto.
  • the material, basis weight, shape, dimensions and the like of surface layer 12 are not particularly limited.
  • first backing airspace 14 is arranged behind surface layer 12 and cooperates with surface layer 12 to exhibit intended sound absorbing properties (in particular, sound absorption coefficient-frequency characteristics).
  • First backing airspace 14 is mainly comprised of air.
  • First backing airspace 14 may act as a support structure that lies between surface layer 12 and perforated substrate 16 for supporting surface layer 12.
  • first backing airspace 14 may be comprised of various materials such as a sponge or other open-cell foam, a honeycomb structure and the like that can support surface layer 12 while substantially uniformly containing air.
  • first backing airspace 14 is formed as an open cell foam of a predetermined thickness that has a first surface 14a that abuts against surface 12b of surface layer 12 and a second layer 14b at the side opposite thereto.
  • inner surface 12b of surface layer 12 can be secured to first surface 14a of the first backing airspace by a publicly known fastening technique such as, for example, adhesion using an adhesive, gluing agent and the like, fusion using ultrasonic wave, induction heating and the like, or thermocompression bonding.
  • surface layer 12 and first backing airspace 14 may be formed integrally in advance.
  • the shape, dimensions and the like of first backing airspace 14 are not particularly limited.
  • Perforated substrate 16 is arranged behind first backing airspace 14 and lies between first backing airspace 14 and second backing airspace 18.
  • Perforated substrate 16 is formed of various materials such as metal, plastic, wood and paper.
  • at least one through hole 20 is formed to interconnect first backing airspace 14 and second backing airspace 18 in a fluidic communicating manner.
  • Perforated substrate 16 may have such rigidity that can support surface layer 12 and first backing airspace 14 while maintaining at least its own shape.
  • perforated substrate 16 is formed as a rigid board of a predetermined thickness that has a first surface 16a that abuts against second surface 14b of first backing airspace 14 and a second surface 16b at the side opposite thereto.
  • second surface 14b of first backing airspace 14 can be secured to first surface 16a of perforated substrate 16 by a publicly known fastening technique such as, for example, adhesion using an adhesive, gluing agent and the like, fusion using ultrasonic wave, induction heating and the like, or thermocompression bonding.
  • perforated substrate 16 has a three-dimensional shape defining second backing airspace 18 of an intended volume and includes a tabular base 22 in which through holes 20 are provided, and one or more columnar or wall-like extensions 24 that are integrally or separately coupled with base 22 at the side of second surface 16b.
  • the material, shape, dimensions and the like of perforated substrate 16 and the shape, dimensions, arrangement, opening ratio and the like of through holes 20 are not particularly limited.
  • Second backing airspace 18 is provided behind perforated substrate 16 and communicates with first backing airspace 14 so that it cooperates with surface layer 12 and first backing airspace 14 to exhibit intended sound absorbing properties (in particular, sound absorption coefficient- frequency characteristics).
  • Second backing airspace 18 is mainly comprised of air.
  • Second backing airspace 18 may act as a support structure for supporting perforated substrate 16.
  • second backing airspace 18 may be comprised of various materials such as a resin foam or other open cell foam, a honeycomb structure and the like that can support perforated substrate 16 while substantially uniformly containing air.
  • second backing airspace 18 is comprised of air accommodated in a chamber having a thickness and a volume that are determined by dimensions of base 24 and extensions 24 of perforated substrate 16.
  • the chamber that forms second backing airspace 18 may be a closed space or it may be opened to the extent that it does not significantly affect the sound absorbing properties.
  • the shape, dimensions and the like of second backing airspace 18 are not particularly limited.
  • Sound absorbing system 10 further includes a reflecting layer adjacent to second backing airspace 18.
  • Reflecting layer 26 is provided at a position substantially opposed to through holes 20 of perforated substrate 16 to reflect the sound incident on second backing airspace 18 toward through holes 20.
  • Reflecting layer 26 is formed of various materials that can reflect the sound such as metal, plastic, wood and paper. Reflecting layer 26 cooperates with perforated substrate 16 to define second backing airspace of an intended volume.
  • reflecting layer 26 is formed as a rigid board of a predetermined thickness that has a first surface (reflecting surface) 26a that abuts against respective end surfaces 24a of extensions 24 of perforated substrate 16 and a second surface 26b at the side opposite thereto.
  • respective end surfaces 24a of extensions 24 of perforated substrate 16 can be secured to first surface 26a of reflecting layer 26 by a publicly known fastening technique such as, for example, adhesion using an adhesive, gluing agent and the like, fusion using ultrasonic wave, induction heating and the like, or thermocompression bonding.
  • perforated substrate 16 and reflecting layer 26 may be integrally formed in advance.
  • the material, shape, dimensions and the like of reflecting layer 26 are not particularly limited. Further, when the sound absorbing function of a Helmholtz type (resonance type) is not needed, reflecting layer 26 may be omitted.
  • Sound absorbing system 10 configured as described above can be manufactured by a sound absorbing system manufacturing method according to an embodiment of the present invention illustrated in Fig. 3.
  • a sound absorbing member 28 including breathable surface layer 12 and first backing airspace 14 adjacent to surface layer 12 is provided (Fig. 3(a)).
  • perforated substrate 16 with through holes 20 connected to second backing airspace 18 in a fluidic communicating manner is provided (Fig. 3(b)).
  • sound absorbing member 28 is attached to perforated substrate 16 so that second surface 14b of first backing airspace 14 faces first surface 16a of perforated substrate 16 and second surface 14b of first backing airspace 14 is secured to first surface 16a of perforated substrate 16 by adhesion, fusion and the like (Fig. 3(c)).
  • first backing airspace 14 communicates with second backing airspace 18 via through holes 20 of perforated substrate 16.
  • reflecting layer 26 is arranged adjacent to second backing airspace 18 and respective end surfaces 24a of extensions 24 of perforated substrate 16 is secured to first surface 26a of reflecting layer 26 by adhesion, fusion and the like (Fig. 3(d)). This operation can be performed before or at the same time or after attaching sound absorbing member 28 to perforated substrate 16. As described above, sound absorbing system 10 is manufactured.
  • first backing airspace 14 when first backing airspace 14 includes an element other than air that acts as a support structure (for example, an open cell foam), instead of providing sound absorbing member 28, surface layer 12 and first backing airspace 14 can be provided separately so that first backing airspace 14 can be attached to perforated substrate 16 and surface layer 12 can be attached to first backing airspace 14.
  • perforated substrate 16 instead of attaching reflecting layer 26 to perforated substrate 16 in the subsequent operation, perforated substrate 16 can be integrally provided with reflecting layer 26 in advance (Fig. 3(e)).
  • new through holes 20 can be formed in addition to through holes 20 provided in advance in the subsequent operation.
  • perforated substrate 16 can be provided by first providing a non-perforated substrate 16' that does not have through holes 20 (Fig. 3(f)) and, then forming intended through holes 20 in the subsequent operation.
  • sound absorbing system 10 configured as described above and its manufacturing method
  • the structural part that includes perforated substrate 16 having through holes 20 and second backing airspace 18 that is connected to through holes 20 in a fluidic communicating manner can be employed and sound absorbing member 28 (or, in other words, surface layer 12 and first backing airspace 14) that is provided separately can be attached to such structural part to install sound absorbing system 10.
  • sound absorbing member 28 or, in other words, surface layer 12 and first backing airspace 14
  • the size (thickness or volume) may be ensured by adding second backing airspace 18.
  • first backing airspace 14 communicates with second backing airspace 18 via through holes 20 of perforated substrate 16
  • the intended sound absorbing properties in particular, the sound absorption coefficient-frequency characteristics
  • the size of second backing airspace 18 increases, a peak sound absorbing rate in the sound absorption coefficient-frequency characteristics of sound absorbing system 10 moves to a lower frequency region.
  • sound absorbing system 10 even when there is a dimensional constraint on the system installation space, the airspace of the size necessary to achieve the intended sound absorbing properties can be ensured within the dimensional constraint. Consequently, even in the place where the conventional sound absorbing structure including the breathable material and the airspace arranged behind the breathable material cannot be disposed because it is difficult to extend the airspace due to the dimensional constraint on the installation space, sound absorbing system 10 can be disposed so that the intended sound absorbing properties can be exhibited and, as a result, acoustic characteristics of a surrounding environment of the installation place can be improved.
  • Sound absorbing system 10 can preferably be installed, for example, in the interior of a car (a roof, instrument panel, pillar panel, door trim, console box, and the like).
  • any tabular part of an interior component can be employed as perforated substrate 16.
  • a space behind the tabular part can be employed as second backing airspace 18 and reinforcement ribs originally provided in the tabular part can be employed as columnar or wall- like extensions 24 of perforated substrate 16.
  • a member (a portion of an interior component or car body panel) opposed to the tabular part via a space can be employed as reflecting layer 26.
  • through holes 20 of an intended configuration can be formed before attaching sound absorbing member 28 (or, in other words, surface layer 12 and first backing airspace 14) to the tabular part.
  • second backing airspace 18 may not be arranged adjacent to through holes of perforated substrate 16.
  • second backing airspace 18 that is defined between perforated substrate 16 and reflecting layer 26 can be arranged at a position deviated from through holes 20 of perforated substrate 16.
  • an air passage 30 that interconnects through holes 20 and second backing airspace 18 in a fluidic communicating manner is provided between perforated substrate 16 and second backing airspace 18 so that air can evenly spread in all through holes 20 of perforated substrate 16.
  • second backing airspace 18 can be arranged at a position apart from perforated substrate 16.
  • sound absorbing system 102 at a position apart from a chamber that is formed of perforated substrate 16 and reflecting layer 26, a casing 32 that forms a second chamber for accommodating second backing airspace 18 is provided and connected to reflecting layer 26 via a connecting duct 34.
  • an air hole 36 formed in reflecting layer 26 and an air hole 38 formed in casing 32 are interconnected by a line 40 of duct 34 to constitute an air passage, and this air passage is connected to air passage 30 between perforated substrate 16 and second backing airspace 18.
  • second backing airspace 18 effectively functions and exhibits an effect similar to that of sound absorbing system 10 of Fig. 1.
  • surface layer 12 can have a three-dimensional shape to define first backing airspace 14 having an intended shape and dimensions between surface layer 12 and perforated substrate 16.
  • surface layer 12 can have a bowl-like shape having a top part 42 and a side part 44.
  • air is accommodated as first backing airspace 14 in a chamber that is formed of surface layer 12 and perforated substrate 16.
  • surface layer 12 can be provided with one (Fig. 7(a)) or a plurality of (Fig.
  • first backing airspace 14 can be relatively freely designed and, as a result, the requirement of the design properties and the like can be easily met.
  • Embodiments 1 and 2 as the opening ratio of perforated substrate 16 increased, the sound absorbing properties were improved. It demonstrated that resonant absorbance of second backing airspace 18 was exhibited in addition to that of surface layer 12 and first backing airspace 14. When the opening ratio of perforated substrate 16 was about 10 % or more, the sound absorbing properties comparable to that of Comparative Examples 1 and 2 (the opening ratio was 100 %) could be achieved. Further, by increasing the thickness of second backing airspace 18, the sound absorbing properties in a low sound frequency range were improved.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Building Environments (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

La présente invention a trait à un système d'absorption phonique (10) qui inclut une couche de surface perméable à l'air (12) ; un premier volume de support (14) qui est adjacent à la couche de surface (12) ; un substrat perforé (16) qui est adjacent au premier volume de support (14) ; un second volume de support (18) qui est en communication avec le premier volume de support (14) au moyen du substrat perforé (16), et une couche réfléchissante (26) qui est adjacente au second volume de support (18). Même lorsque le premier volume de support (14) ne dispose pas des dimensions nécessaires pour obtenir les propriétés d'absorption phonique voulues, dans la mesure où le premier volume de support (14) est en communication avec le second volume de support (18) au moyen d'un trou traversant (20) du substrat perforé (16), il est possible d'obtenir les propriétés d'absorption phonique voulues grâce à la présence du second volume de support (18), sans augmenter les dimensions du premier volume de support (14).
PCT/US2011/040497 2010-06-30 2011-06-15 Système d'absorption phonique et son procédé de fabrication Ceased WO2012012044A2 (fr)

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JP2010149734A JP2012013912A (ja) 2010-06-30 2010-06-30 吸音システム及びその作製方法
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Cited By (2)

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WO2014111068A3 (fr) * 2013-01-18 2014-11-27 Technicka Univerzita V Liberci Moyens d'absorption phonique contenant au moins un résonateur à cavité
CN108492816A (zh) * 2018-05-31 2018-09-04 山东理工大学 一种带微穿孔板的二维凸起型声子晶体结构

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JP5918662B2 (ja) 2012-09-04 2016-05-18 株式会社神戸製鋼所 多孔吸音構造
JP6165466B2 (ja) 2013-02-27 2017-07-19 株式会社神戸製鋼所 防音構造
JP6929532B2 (ja) * 2016-04-05 2021-09-01 株式会社Ｓｋテック 防音パネル
JPWO2019021478A1 (ja) * 2017-07-28 2020-05-28 イビデン株式会社 防音構造体、車両用部品及び自動車
JP6959996B2 (ja) * 2018-01-10 2021-11-05 富士フイルム株式会社 防音構造、防音囲構造、及び防音箱
JP6550523B1 (ja) * 2018-01-10 2019-07-24 富士フイルム株式会社 防音構造、防音囲構造、及び防音箱
WO2019138969A1 (fr) * 2018-01-10 2019-07-18 富士フイルム株式会社 Boîte d'insonorisation
CN114104234B (zh) * 2021-11-30 2023-08-08 浙江大学 覆盖层漫反射式吸声超结构单元及超结构
JP7351429B1 (ja) 2022-12-12 2023-09-27 株式会社レゾナック 吸音材及び車両部材

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014111068A3 (fr) * 2013-01-18 2014-11-27 Technicka Univerzita V Liberci Moyens d'absorption phonique contenant au moins un résonateur à cavité
CN108492816A (zh) * 2018-05-31 2018-09-04 山东理工大学 一种带微穿孔板的二维凸起型声子晶体结构

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