WO2008088251A1 - Method for absorbing sound waves - Google Patents

Method for absorbing sound waves Download PDF

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Publication number
WO2008088251A1
WO2008088251A1 PCT/SE2007/001131 SE2007001131W WO2008088251A1 WO 2008088251 A1 WO2008088251 A1 WO 2008088251A1 SE 2007001131 W SE2007001131 W SE 2007001131W WO 2008088251 A1 WO2008088251 A1 WO 2008088251A1
Authority
WO
WIPO (PCT)
Prior art keywords
absorbent
walls
present
room
roof
Prior art date
Application number
PCT/SE2007/001131
Other languages
French (fr)
Inventor
Bengt Lund
Original Assignee
B & L Lund Ab
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 B & L Lund Ab filed Critical B & L Lund Ab
Priority to EP07861089.6A priority Critical patent/EP2100292A4/en
Publication of WO2008088251A1 publication Critical patent/WO2008088251A1/en

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Classifications

    • 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
    • E04B1/8209—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 sound absorbing devices
    • 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
    • E04B1/99—Room acoustics, i.e. forms of, or arrangements in, rooms for influencing or directing sound
    • 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
    • E04B2001/8263—Mounting of acoustical elements on supporting structure, e.g. framework or wall surface
    • E04B2001/829—Flat elements mounted at an angle, e.g. right angle, to the supporting surface

Definitions

  • the present invention relates to a method according to the preamble to appended Claim 1.
  • the task forming the basis of the present invention is to satisfy the above-outlined needs.
  • the method according to the present invention realises an extremely versatile possibility for governing the sound waves in a room.
  • An absorbent according to the present invention permits the absorption of relatively low frequency sound.
  • An absorbent which is positioned using the method according to the present invention will have an extremely good absorbing effect on the octave band 125 Hz.
  • the method according to the present invention further makes for a versatile and simple assembly with different types of shells and the flexibility of the product makes for an enormous wealth of variation for the user.
  • An absorbent according to the present invention may possibly be employed as a table or a shelf.
  • An absorbent according to the present invention may further be positioned, as was mentioned above, between two converging walls, centrally on a wall, at the edge between wall and roof or as an item of furniture in a corner.
  • the present invention further makes for an adjustable and highly variable effect on the acoustics in a room, with the aid of different types of slat device solutions.
  • Fig. 1 is a perspective view of a corner of a room with an absorbent according to the present invention.
  • Fig. 2 is a perspective view of a further embodiment of an absorbent according to the present invention.
  • Fig. 3 is a perspective view of an embodiment of the same type as in Fig. 2.
  • Fig. 4 is a perspective view of one embodiment of an absorbent according to the present invention.
  • Fig. 5 is a top plan view of an absorbent according to the present invention.
  • Fig. 6 is a graph illustrating the employment of an absorbent according to the present invention.
  • a panel 1 of absorbent material is positioned in a corner between two walls 2 and 3, and a floor 4.
  • the panel consists of a per se known absorbent material with selected flow resistance and selected absorbent thickness, as well as selected distance from the actual apex of the corner to the middle or centre of the panel. The distance should suitably be a quarter of the wavelength of the sound waves which it is desired to absorb.
  • the configuration of the panel is adapted to the corner between the walls 2, 3 and the floor 4.
  • Fig. 1 intimates additional absorbent layers for illustrating that the absorbent according to the present invention may consist of a plurality of layers for the absorption of sound waves of several different frequencies.
  • the different parameters may naturally be varied for attaining absorption of the desired frequency and/or frequencies. It is also possible to provide the panel with a slat arrangement in order to permit adjustment or variation of the absorption. Further, the panel 1 may be positioned down at the floor (as shown), a distance above the floor, or even up at the roof in the room. In that case when the room is provided with an inner ceiling, a corner absorbent according to the present invention may be positioned in one or more of the corners in the space above the ceiling, for example in the corner between two walls and the beam structure above the ceiling.
  • Figs. 2 and 3 show further examples of absorbents according to the present invention.
  • the arrow 1 relates to flow resistance, increased flow resistance entailing reduced speed and thereby shorter wavelength.
  • the arrows 2 relate to the distance from the apex of the corner, which implies wavelength/4, in which even the distance varies with the angle of impingement.
  • the arrow 3 relates to the absorbent thickness, in which event increased thickness affords absorption of lower frequencies.
  • Fig. 4 shows yet a further embodiment of an absorbent according to the present invention which has pyramidal side surfaces 5 and 6 which are placed in a framework consisting of longitudinal angle profiles 7, 8 and 9, a bottom 10 and top members 11 and 12.
  • the profiles may be manufactured from metal, wood, plastic or some other similar material.
  • the absorbent according to the present invention it is possible to achieve absorption factors of 3-6. On positioning of the absorbent in a corner, the absorption factor 3 will be achieved after the selection of suitable parameters.
  • An absorbent according to the present invention may be manufactured from angular cut absorbent material of selected density and thickness. Further, the panel may be provided with a frame for protection and assembly, in which even the frame is advantageously manufactured from metal, but other materials are naturally also possible. The panel may be provided with a surface cladding of cloth or glass fibre fabric. Its size is adapted as was mentioned above to the need for absorption. For versatile adaptation, the absorbent may be provided with hatches or slats of metal or wood, or other material. The absorbent according to the present invention makes for the cost-effective governing of the acoustics in a room. If the absorbent is provided with a dense surface layer, the absorption of high frequencies may be counteracted. Using extremely porous absorbent and a surface layer of a thickness of 2 to 3 cm, the flow resistance will be extremely low, so that frequencies of up to 16000 Hz are absorbed.
  • Fig. 5 shows a further embodiment of an absorbent according to the present invention, which comprises three layers 13, 14, 15, which may have different properties, e.g. difference flow resistances.
  • a surface layer 16 of suitable material, for example glass fibre fabric, is disposed on the outside of the outer layer 13, and a surface layer 17 is disposed on the inside of the inner layer 15.
  • Surface layers may also be provided between the absorbent layers 13, 14 and 15.
  • the surface layers may possibly consist of membranes of different permeabilities.
  • the surface layers may also be wholly and/or partly covering.
  • Fig. 6 shows a graph in the form of a sinus curve of a sound wave in air, an absorbent and air, it being apparent that the speed of the sound in a selection of suitable flow resistances (sonic impedance) in the absorbent is reduced to for example 120m/s and that the wavelength is reduced by 65%.
  • the corner absorbent according to the present invention permits a shortening of the distance to the corner and nevertheless a quarter wavelength will be achieved in the absorbent. With the distance a quarter wavelength from the corner, the reduction of particle movement (speed) will be at its maximum for each frequency and maximum absorption will be achieved.
  • the absorbent had a flow resistance which reduced the sound speed from approx. 340 m/s to approx. 100 m/s and which was positioned a quarter wavelength or its equivalent from the corner apex, there was obtained a sound damping of approx. times.
  • For absorption of sound waves of the frequency 125 Hz it is appropriate to combine a 100 mm thick glass fibre wool panel of the high compact type with a 50 mm thick glass wool panel of the low compact type. At the frequency of 60 Hz, the thicknesses of 250 mm and 50 mm, respectively, are selected.
  • the wavelength is reduced by approx. 65% and the distance between the apex of the corner and the absorbent can then be reduced correspondingly in order to achieve a quarter wavelength and thereby maximum absorption.

Abstract

The present invention relates to a method of absorbing sound waves in a room, at least one absorbent (Figs. 1 to 5) being placed in one or more corners between two walls (2, 3) and/or two walls and a floor (4) and/or a roof, so that the absorbent extends between the walls (2, 3) and possibly connects to the floor (4) or roof.

Description

Method for absorbing Sound Waves
The present invention relates to a method according to the preamble to appended Claim 1.
According to prior art methods of affecting sound waves in a room, some type of sound wave absorbing material is placed on parts of, or the whole of the roof surface and/or the whole of, or parts of wall surfaces connecting to the roof surface, this possibly in the immediate proximity of the wall surface. By such means, there will be realised an effect on the reverberation time in the room, which in many cases is acceptable. However, nowadays further demands are placed on the possibility for creating more efficient remedial measures and moreover the possibility for simple alterations and adjustments of the sound wave absorption in the room.
The task forming the basis of the present invention is to satisfy the above-outlined needs.
This task is solved according to the present invention in that the method disclosed by way of introduction is given the characterising features as set forth in appended Claim 1.
The method according to the present invention realises an extremely versatile possibility for governing the sound waves in a room. An absorbent according to the present invention permits the absorption of relatively low frequency sound. An absorbent which is positioned using the method according to the present invention will have an extremely good absorbing effect on the octave band 125 Hz. The method according to the present invention further makes for a versatile and simple assembly with different types of shells and the flexibility of the product makes for an enormous wealth of variation for the user. An absorbent according to the present invention may possibly be employed as a table or a shelf. An absorbent according to the present invention may further be positioned, as was mentioned above, between two converging walls, centrally on a wall, at the edge between wall and roof or as an item of furniture in a corner. The present invention further makes for an adjustable and highly variable effect on the acoustics in a room, with the aid of different types of slat device solutions.
The present invention will now be described in greater detail hereinbelow, with reference to the accompanying Drawings. Fig. 1 is a perspective view of a corner of a room with an absorbent according to the present invention. Fig. 2 is a perspective view of a further embodiment of an absorbent according to the present invention. Fig. 3 is a perspective view of an embodiment of the same type as in Fig. 2. Fig. 4 is a perspective view of one embodiment of an absorbent according to the present invention. Fig. 5 is a top plan view of an absorbent according to the present invention. Fig. 6 is a graph illustrating the employment of an absorbent according to the present invention.
According to Fig. 1, a panel 1 of absorbent material is positioned in a corner between two walls 2 and 3, and a floor 4. The panel consists of a per se known absorbent material with selected flow resistance and selected absorbent thickness, as well as selected distance from the actual apex of the corner to the middle or centre of the panel. The distance should suitably be a quarter of the wavelength of the sound waves which it is desired to absorb. The configuration of the panel is adapted to the corner between the walls 2, 3 and the floor 4. Further, Fig. 1 intimates additional absorbent layers for illustrating that the absorbent according to the present invention may consist of a plurality of layers for the absorption of sound waves of several different frequencies.
The different parameters may naturally be varied for attaining absorption of the desired frequency and/or frequencies. It is also possible to provide the panel with a slat arrangement in order to permit adjustment or variation of the absorption. Further, the panel 1 may be positioned down at the floor (as shown), a distance above the floor, or even up at the roof in the room. In that case when the room is provided with an inner ceiling, a corner absorbent according to the present invention may be positioned in one or more of the corners in the space above the ceiling, for example in the corner between two walls and the beam structure above the ceiling.
Figs. 2 and 3 show further examples of absorbents according to the present invention. In Fig. 3, the arrow 1 relates to flow resistance, increased flow resistance entailing reduced speed and thereby shorter wavelength. The arrows 2 relate to the distance from the apex of the corner, which implies wavelength/4, in which even the distance varies with the angle of impingement. The arrow 3 relates to the absorbent thickness, in which event increased thickness affords absorption of lower frequencies. Fig. 4 shows yet a further embodiment of an absorbent according to the present invention which has pyramidal side surfaces 5 and 6 which are placed in a framework consisting of longitudinal angle profiles 7, 8 and 9, a bottom 10 and top members 11 and 12. The profiles may be manufactured from metal, wood, plastic or some other similar material.
Using the absorbent according to the present invention, it is possible to achieve absorption factors of 3-6. On positioning of the absorbent in a corner, the absorption factor 3 will be achieved after the selection of suitable parameters.
An absorbent according to the present invention may be manufactured from angular cut absorbent material of selected density and thickness. Further, the panel may be provided with a frame for protection and assembly, in which even the frame is advantageously manufactured from metal, but other materials are naturally also possible. The panel may be provided with a surface cladding of cloth or glass fibre fabric. Its size is adapted as was mentioned above to the need for absorption. For versatile adaptation, the absorbent may be provided with hatches or slats of metal or wood, or other material. The absorbent according to the present invention makes for the cost-effective governing of the acoustics in a room. If the absorbent is provided with a dense surface layer, the absorption of high frequencies may be counteracted. Using extremely porous absorbent and a surface layer of a thickness of 2 to 3 cm, the flow resistance will be extremely low, so that frequencies of up to 16000 Hz are absorbed.
Fig. 5 shows a further embodiment of an absorbent according to the present invention, which comprises three layers 13, 14, 15, which may have different properties, e.g. difference flow resistances. A surface layer 16 of suitable material, for example glass fibre fabric, is disposed on the outside of the outer layer 13, and a surface layer 17 is disposed on the inside of the inner layer 15. Surface layers may also be provided between the absorbent layers 13, 14 and 15. The surface layers may possibly consist of membranes of different permeabilities. The surface layers may also be wholly and/or partly covering.
Fig. 6 shows a graph in the form of a sinus curve of a sound wave in air, an absorbent and air, it being apparent that the speed of the sound in a selection of suitable flow resistances (sonic impedance) in the absorbent is reduced to for example 120m/s and that the wavelength is reduced by 65%. The corner absorbent according to the present invention permits a shortening of the distance to the corner and nevertheless a quarter wavelength will be achieved in the absorbent. With the distance a quarter wavelength from the corner, the reduction of particle movement (speed) will be at its maximum for each frequency and maximum absorption will be achieved.
Using a prototype in which the absorbent had a flow resistance which reduced the sound speed from approx. 340 m/s to approx. 100 m/s and which was positioned a quarter wavelength or its equivalent from the corner apex, there was obtained a sound damping of approx. times. For absorption of sound waves of the frequency 125 Hz, it is appropriate to combine a 100 mm thick glass fibre wool panel of the high compact type with a 50 mm thick glass wool panel of the low compact type. At the frequency of 60 Hz, the thicknesses of 250 mm and 50 mm, respectively, are selected. By a reduction of the speed of sound by means of the absorbent to approx. 100 m/s, the wavelength is reduced by approx. 65% and the distance between the apex of the corner and the absorbent can then be reduced correspondingly in order to achieve a quarter wavelength and thereby maximum absorption.
Many modifications are naturally possible without departing from the scope of the invention as defined in the appended Claims.

Claims

1. A method of absorbing sound waves in a room, characterised in that at least one absorbent (Figs. 1-5) is placed in one or more corners between two walls (2, 3) and/or two walls and a floor (4) and/or a roof, so that the absorbent extends between the walls (2, 3) and possibly connects to the floor (4) or roof.
2. The method as claimed in Claim 1, characterised in that the absorbent is placed a distance from the apex of the corner between at least the two walls (2, 3).
3. The method as claimed in Claim 2, characterised in that the absorbent (Figs. 2, 3) is made arched with substantially the same outside configuration as inside configuration.
4. The method as claimed in Claim 2, characterised in that the absorbent (Fig. 4) is given the form of a wholly or partly hollow body with pyramidal planes (5, 6).
5. The method as claimed in Claim 3, characterised in that the absorbent (Figs. 2, 3) is given the form of a part of a sphere, an elliptic sphere or the like, possibly at least partly with a hollow interior.
6. The method as claimed in any of the preceding Claims, characterised in that the absorbent is provided with a surface layer (16, 17) e.g. glass fibre fabric, cloth or the like.
7. The method as claimed in any of the preceding Claims, characterised in that the absorbent is provided with adjustable hatches, slats, etc. of metal, wood, plastic or the like.
8. The method as claimed in any of the preceding Claims, characterised in that the absorbent is placed in a framework consisting of angle rails (7, 8, 9, 10, 11, 12) of a suitable material, e.g. wood, metal, plastic or the like.
9. The method as claimed in any of the preceding Claims, characterised in that the absorbent is built up from a plurality of layers (13, 14, 15) possessing different properties, e.g. flow resistances, and possibly with surface layers (16, 17) which are wholly and/or partly covering and which are permeable or impermeable.
10. The method as claimed in Claim 1 and any of Claims 2 to 9, characterised in that the absorbent is positioned in one or more corners between two walls and/or two walls and the room roof above a possible room ceiling.
PCT/SE2007/001131 2006-12-28 2007-12-19 Method for absorbing sound waves WO2008088251A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07861089.6A EP2100292A4 (en) 2006-12-28 2007-12-19 Method for absorbing sound waves

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0602831A SE0602831L (en) 2006-12-28 2006-12-28 Ways of absorbing sound waves
SE0602831-0 2006-12-28

Publications (1)

Publication Number Publication Date
WO2008088251A1 true WO2008088251A1 (en) 2008-07-24

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Application Number Title Priority Date Filing Date
PCT/SE2007/001131 WO2008088251A1 (en) 2006-12-28 2007-12-19 Method for absorbing sound waves

Country Status (3)

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EP (1) EP2100292A4 (en)
SE (1) SE0602831L (en)
WO (1) WO2008088251A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016118985A1 (en) * 2015-01-30 2016-08-04 Getzner Textil Aktiengesellschaft Absorber device
US20220246127A1 (en) * 2021-02-01 2022-08-04 Jayvic Llc Full Frequency Acoustic System and Method of Use

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998055709A1 (en) * 1997-06-06 1998-12-10 Owens Corning Acoustical room paneling and method of installation
US5975238A (en) * 1995-02-24 1999-11-02 Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forschung E. V. Plate resonator
US6015025A (en) * 1997-06-06 2000-01-18 Owens Corning Fiberglas Technology, Inc. Diffuser panel with built-in speaker arrangement and methods of installation
US6179086B1 (en) * 1998-02-06 2001-01-30 Eurocopter Deutschland Gmbh Noise attenuating sandwich composite panel

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Publication number Priority date Publication date Assignee Title
SE427364B (en) * 1980-04-09 1983-03-28 A & K Byggnadsfysik Ab DIAGONALLY MOUNTED SOUND ABSORBENT
SE500334C2 (en) * 1990-02-08 1994-06-06 Rockwool Ab Curved acoustic element
US5035298A (en) * 1990-04-02 1991-07-30 Noxon Arthur M Wall attached sound absorptive structure
DE29815723U1 (en) * 1997-09-04 1999-06-10 Fraunhofer Ges Forschung Low-reflection room for the entire listening area
US5992561A (en) * 1998-01-06 1999-11-30 Kinetics Noise Control Sound absorber, room and method of making

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5975238A (en) * 1995-02-24 1999-11-02 Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forschung E. V. Plate resonator
WO1998055709A1 (en) * 1997-06-06 1998-12-10 Owens Corning Acoustical room paneling and method of installation
US6015025A (en) * 1997-06-06 2000-01-18 Owens Corning Fiberglas Technology, Inc. Diffuser panel with built-in speaker arrangement and methods of installation
US6179086B1 (en) * 1998-02-06 2001-01-30 Eurocopter Deutschland Gmbh Noise attenuating sandwich composite panel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2100292A4 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016118985A1 (en) * 2015-01-30 2016-08-04 Getzner Textil Aktiengesellschaft Absorber device
US20220246127A1 (en) * 2021-02-01 2022-08-04 Jayvic Llc Full Frequency Acoustic System and Method of Use
US11568847B2 (en) * 2021-02-01 2023-01-31 Jayvic Llc Full frequency acoustic system and method of use

Also Published As

Publication number Publication date
EP2100292A1 (en) 2009-09-16
SE0602831L (en) 2008-06-29
EP2100292A4 (en) 2014-03-12

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