US20060131104A1 - Sound-absorbing structure body - Google Patents

Sound-absorbing structure body Download PDF

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Publication number
US20060131104A1
US20060131104A1 US10/545,161 US54516105A US2006131104A1 US 20060131104 A1 US20060131104 A1 US 20060131104A1 US 54516105 A US54516105 A US 54516105A US 2006131104 A1 US2006131104 A1 US 2006131104A1
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US
United States
Prior art keywords
sound
board
ridge
structure body
absorbing structure
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.)
Abandoned
Application number
US10/545,161
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English (en)
Inventor
Zenzo Yamaguchi
Ichiro Yamagiwa
Toshimitsu Tanaka
Hiroki Ueda
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Assigned to KABUSHIKI KAISHA KOBE SEIKO SHO reassignment KABUSHIKI KAISHA KOBE SEIKO SHO ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TANAKA, TOSHIMITSU, UEDA, HIROKI, YAMAGIWA, ICHIRO, YAMAGUCHI, ZENZO
Publication of US20060131104A1 publication Critical patent/US20060131104A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the present invention relates to a sound-absorbing structure body comprising a ridge-groove board formed with a large number of ridges and grooves and a closing board joined to the ridge-groove board so as to close one side of the ridge-groove board.
  • a sound-absorbing member for a vehicle has been known in which a perforated board is disposed on a lower surface side of a panel through an air layer and a thickness of the perforated board, a diameter and a pitch of holes and a thickness of the air layer are adjusted to absorb noises in a predetermined frequency range.
  • Noises in a specific frequency range are effectively absorbed by adjusting the thickness of the perforated board, the diameter and pitch of holes and the thickness of the air layer and by utilizing the Helmholtz's resonance principle.
  • a sound-absorbing structure body comprising a ridge-groove board formed with a large number of ridges and grooves, a closing board joined to the ridge-groove board so as to close one side of the ridge-groove board and thereby form a hollow portion, a partition board for partitioning the hollow portion into two or more partitioned spaces, and one or more holes opened in the ridge-groove board so as to bring each of the two or more partitioned spaces into communication with an exterior space.
  • each partitioned space comes to function as a resonance type sound-absorbing mechanism, whereby it is possible to produce a peak frequency with a sound absorption coefficient corresponding to each partitioned space.
  • partitioning may be done in various forms each having a predetermined internal volume, for example, by disposing horizontally, vertically or obliquely the partition board for partitioning the hollow portion into two or more partitioned spaces.
  • one or more foils are disposed in at least one of two or more partitioned spaces so that the foil(s) can vibrate or can be rubbed.
  • a sound wave which has reached a partitioned space causes vibration or rubbing of the foil(s) and the sound absorption coefficient of each sound absorption peak frequency increases due to viscosity induced when the sound wave passes between the foils.
  • the foils may be disposed respectively into two or more partitioned spaces or the foil may be disposed selectively into a partitioned space having a predetermined sound absorption peak frequency.
  • the foil(s) has plural through holes.
  • the sound absorption coefficient of each sound-absorbing peak frequency further increases.
  • a porous sound-absorbing material is disposed in at least one of two or more partitioned spaces.
  • the porous sound-absorbing material is disposed in the interior of a partitioned space which communicates with an outside air through at least one hole, the sound absorption coefficient of each sound absorption peak frequency increases due to damping of the sound wave caused by the porous sound-absorbing material.
  • the other side of the ridge-groove board is covered with the sound-absorbing material.
  • the sound-absorbing material on the surface absorbs a high frequency in addition to the peak frequency in the resonance type sound absorption based on hole groups in each partitioned space.
  • a perforated board is disposed on the other side of the ridge-groove board.
  • the sound absorption frequency band is widened and the sound absorption coefficient near the sound absorption peak frequency is increased.
  • FIG. 1 ( a ) is an explanatory diagram showing a schematic configuration of a sound-absorbing structure body according to a first embodiment of the present invention
  • FIG. 1 ( b ) is an explanatory diagram showing a schematic configuration of the sound-absorbing structure body of the first embodiment
  • FIG. 2 is an explanatory diagram showing a schematic configuration of a sound-absorbing structure body according to a second embodiment of the present invention
  • FIG. 3 is an explanatory diagram showing a schematic configuration of a sound-absorbing structure body according to a third embodiment of the present invention.
  • FIG. 4 is an explanatory diagram showing a schematic configuration of a sound-absorbing structure body according to a fourth embodiment of the present invention.
  • FIG. 5 is an explanatory diagram showing a schematic configuration of a sound-absorbing structure body according to a fifth embodiment of the present invention.
  • FIG. 6 is an explanatory diagram showing a schematic configuration of a sound-absorbing structure body according to a sixth embodiment of the present invention.
  • FIG. 7 is a specification diagram of a sample of the sound-absorbing structure body used in the first embodiment
  • FIG. 8 is a graph showing a sound absorption coefficient characteristic of the sound-absorbing structure body of the first embodiment
  • FIG. 9 is a specification diagram of a sample of the sound-absorbing structure body used in the second embodiment.
  • FIG. 10 is a graph showing a sound absorption coefficient characteristic of the sound-absorbing structure body of the second embodiment.
  • FIGS. 1 ( a ) and 1 ( b ) are explanatory diagrams each showing a schematic configuration of a sound-absorbing structure body according to a first embodiment of the present invention.
  • a sound-absorbing structure body 10 is basically constituted by a laminated structure body comprising a ridge-groove board 11 formed with a large number of independent grooves 12 and a closing board 15 which is joined to the ridge-groove board 11 so as to form a hollow portion 13 between adjacent grooves (anti-sound source side of the ridges).
  • a partition board 21 for partitioning the hollow portion 13 into two or more partitioned spaces 22 and hole groups 25 which are opened in the ridge-groove board 11 so as to communicate with each of the two or more partitioned spaces 22 .
  • the ridge-groove board 11 comprises a large number of cone (truncated cone)-shaped grooves 12 .
  • the grooves 12 may be not only in such a truncated cone shape as shown in the drawing but also for example in a semispherical shape, a rod shape of a semicircular section, or a boat shape. Further, the grooves 12 may be arranged in any various forms, including checkerboard, lattice and zigzag forms.
  • the closing board 15 By superimposing the closing board 15 which is flat onto the back sides of the bottoms of the grooves 12 , there are formed hollow portions 13 spreading around the grooves 12 . With the closing board 15 disposed on the back sides of the grooves 12 , it is possible to form intercommunicating wide hollow portions 13 around the grooves 12 .
  • Surroundings of the laminated structure body comprising the ridge-groove board 11 and the closing board 15 are closed by suitable means.
  • a metallic board such as an aluminum or iron board is used as the ridge-groove board 11 .
  • the closing board 15 there used for example, a metallic board such as an aluminum or iron board or a resin or wooden board.
  • Suitable connecting means e.g., bonding, welding, or screwing, is adopted for connection of the closing board 15 to the bottoms of the grooves 12 in the ridge-groove board 11 .
  • the partition board 21 partitions each hollow portion 13 vertically into two stages of a first partitioned space 22 a and a second partitioned space 22 b .
  • the partition board 21 is a perforated board having a large number of holes in which the grooves 12 are closely fitted.
  • the partition board it is preferable to use a metallic board such as an aluminum or iron board which can be joined to the ridge-groove board 11 by spot welding.
  • a resin board may be bonded to the ridge-groove board 11 .
  • the first partitioned space 22 a is in communication with an exterior space on the sound source side through a first hole group 25 a comprising a large number of holes which are opened to a sound source-side surface of the ridge-groove board 11 and a large number of holes which are opened to side surfaces of the grooves 12 .
  • the second partitioned space 22 b is in communication with the exterior space on the sound source side through a second hole group 25 b comprising a large number of holes which are opened to side surfaces of the grooves 12 .
  • the first partitioned space 22 a and the first hole group 25 a constitute a first resonance type sound absorber which exhibits a predetermined sound absorption coefficient at a predetermined frequency
  • the second partitioned space 22 b and the second hole group 25 b constitute a second resonance type sound absorber which exhibits a predetermined sound absorption coefficient at a predetermined frequency.
  • Two sound absorption peaks can be provided by the first and second sound resonance type absorbers and a required sound absorption coefficient band can be widened by adjusting the two peak frequencies.
  • Two partition boards parallel to the closing board 15 may be provided so as to partition space between the ridge-groove board 11 and the closing board 15 into three stages of first, second and third partitioned spaces.
  • a required sound absorption coefficient band can be widened by adjusting the three peak frequencies.
  • N number of peaks which exhibit a desired sound absorption coefficient at a predetermined frequency can be obtained by forming n number of partitioned spaces as in FIG. 1 ( b ) and by suitably selecting one, or one combination or more, of the number of holes formed in each partitioned space, a diameter thereof, an opening ratio of holes, a thickness of the ridge-groove board, and volume or size of each partitioned space.
  • the sound-absorbing structure body 100 is basically constituted by a laminated structure body comprising a ridge-groove board 111 having alternate ridges 112 and grooves and a closing board 115 joined to the bottoms of the grooves so as to form a hollow portion 113 within each of the ridges 112 .
  • partition boards 121 , 131 , 141 , 142 each for partitioning each hollow portion 113 into two or more partitioned spaces and two or more hole groups 125 a , 125 b , 135 a , 135 b , 145 a , 145 b , 145 c which are opened to the surface of the ridge-groove board 111 so as to communicate with two or more partitioned spaces 122 a , 122 b , 132 a , 132 b , 143 a , 143 b , 143 c.
  • a partition board 121 is disposed obliquely in a diagonal form to partition the hollow portion 113 into two partitioned spaces 122 a and 122 b of a triangular section, and a first hole group 125 a communicating with the partitioned spaces 122 a and 122 b are formed.
  • a partition board 131 perpendicular to the center of the ridge 112 is disposed to partition the hollow portion 113 into left and right partitioned spaces 132 a , 132 b , and first hole groups 135 a and 135 b communicating with the partitioned spaces 132 a and 132 b , respectively, are formed.
  • a first partition board 141 parallel to the closing board 115 and a second partition board 142 which is oblique relative to the closing board 115 are disposed to partition the hollow portion 113 into three vertical stages of partitioned spaces 143 a , 143 b and 143 c , and first group holes 145 a , 145 b and 145 c communicating with the partitioned spaces 143 a , 143 b and 143 c , respectively, are formed.
  • foils 201 a and 201 b are added into the partitioned space 22 a used in the sound-absorbing structure of the first embodiment.
  • a first perforated foil 201 a is fitted into the first partitioned space in parallel with the closing board 15 , making it possible for the first foil 201 a to vibrate or be rubbed with air passing into and out of the first hole group 25 a .
  • a second perforated foil 201 b is fitted into the second partitioned space in parallel with the closing board 15 , making it possible for the second foil 201 b to vibrate or be rubbed with air passing into and out of the second hole group 25 b.
  • each of the foils 201 a and 201 b there may be used a mere foil, foil formed in a ridge-groove shape, foil formed in a folded shape, or foil having plural through holes.
  • the foil having plural through holes is advantageous in that not only the configuration is simple but also the sound absorption coefficient of each sound absorption peak frequency further increases with a sound wave passing through the through holes formed in the foil.
  • the second foil may be obliquely inserted so as to confront the second hole group 25 b .
  • one or more sheets of foil can be inserted into one or more partitioned spaces.
  • the sound absorption coefficient of each sound absorption peak frequency increases as a result of vibration or rubbing of the foil.
  • porous sound-absorbing materials 301 a and 301 b are added into an interior space of the sound-absorbing structure body of the first embodiment.
  • a porous sound-absorbing material 301 a is fitted into an upper portion of the first partitioned space 22 a and a perforated sound-absorbing material 301 b is fitted into a lower portion of the second partitioned space 22 b .
  • various forms are available, including those shown in the central hollow portion and the right-hand hollow portion in FIG. 4 .
  • porous sound-absorbing materials 301 a and 301 b there is used a fibrous sound-absorbing material such as glass wool, a metallic fiber such as aluminum or stainless steel, a compressed product of a paper strip-like metal, non-woven cloth, or a metallic or resinous foam.
  • shape of the sound-absorbing materials there may be used any of various shapes, including a plate-like shape.
  • the sound source-side surface of the sound-absorbing structure body of the first embodiment is covered with a sound-absorbing material 401 .
  • a sound-absorbing material there may be used any of various sound-absorbing materials in addition to the porous sound-absorbing materials described above. It is possible to effect sound absorption for high frequencies other than the resonance type sound absorption peak frequency.
  • a perforated board 501 is disposed at intervals of a predetermined distance on the sound source-side surface of the sound-absorbing structure of the second embodiment.
  • the perforated board 501 brings about a sound absorbing effect of widening the sound absorption frequency band and thereby increasing the sound absorption coefficient.
  • a sound-absorbing structure body can be provided wherein a closing board is attached to the bottoms of ridges of a ridge-groove board having a large number of such ridges whose interiors are hollow, the hollow portions are partitioned into two or more partitioned spaces by a partition board, and one or more holes opened in the ridge-groove board are formed so as to communicate with each of the partitioned spaces.
  • a closing board is attached to the bottoms of ridges of a ridge-groove board having a large number of such ridges whose interiors are hollow
  • the hollow portions are partitioned into two or more partitioned spaces by a partition board
  • one or more holes opened in the ridge-groove board are formed so as to communicate with each of the partitioned spaces.
  • Simulation was performed with respect to a sound absorption characteristic of a sample of the sound-absorbing structure body shown in FIG. 1 , the sample having such various factors as shown in FIG. 7 , results of which are shown in FIG. 8 .
  • a large sound absorption peak can be developed in a low frequency range as compared with the case where the hollow portion is not divided.
  • Simulation was performed with respect to a sound absorption characteristic of a sample of the sound-absorbing structure body shown in FIG. 3 , the sample having such various factors as shown in FIG. 9 .
  • a mere aluminum foil into a hollow portion it is possible to increase the sound absorption coefficient of a sound absorption peak in a high frequency range.
  • the sound absorption coefficient of the sound absorption peak in the high frequency range can be further increased.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)
US10/545,161 2003-02-24 2004-01-23 Sound-absorbing structure body Abandoned US20060131104A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003045483A JP4050632B2 (ja) 2003-02-24 2003-02-24 吸音構造体
PCT/JP2004/000598 WO2004075164A1 (fr) 2003-02-24 2004-01-23 Corps a structure d'isolation phonique

Publications (1)

Publication Number Publication Date
US20060131104A1 true US20060131104A1 (en) 2006-06-22

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US10/545,161 Abandoned US20060131104A1 (en) 2003-02-24 2004-01-23 Sound-absorbing structure body

Country Status (6)

Country Link
US (1) US20060131104A1 (fr)
EP (1) EP1598809A4 (fr)
JP (1) JP4050632B2 (fr)
KR (1) KR100720639B1 (fr)
CN (1) CN1754202A (fr)
WO (1) WO2004075164A1 (fr)

Cited By (11)

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US20090266645A1 (en) * 2006-04-27 2009-10-29 Masao Suzuki Sound Insulating Device
CN102081924A (zh) * 2009-11-30 2011-06-01 株式会社神户制钢所 隔音材料、隔音系统以及隔音材料的制造方法
WO2014008507A2 (fr) 2012-07-06 2014-01-09 C&D Zodiac, Inc. Panneau d'intérieur d'avion à matériaux acoustiques
US20150211226A1 (en) * 2012-09-04 2015-07-30 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Porous sound absorbing structure
US20160012811A1 (en) * 2013-02-27 2016-01-14 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Sound insulating structure
US20160365079A1 (en) * 2014-03-04 2016-12-15 Jean-Marc Scherrer High and low frequency sound absorption assembly
US20190080676A1 (en) * 2017-09-13 2019-03-14 Korea Institute Of Machinery & Materials Sound absorbing cell and sound absorbing structure having the same
US11192505B2 (en) * 2019-03-20 2021-12-07 Toyota Jidosha Kabushiki Kaisha Rocker exterior component structure
US11339545B2 (en) * 2018-10-31 2022-05-24 Hung-Ming Hsu Sound absorbing board
US11536411B2 (en) 2017-10-03 2022-12-27 Fujifilm Corporation Silencing tubular structure body
US11654841B2 (en) 2017-10-11 2023-05-23 Fujifilm Corporation Box-shaped soundproof structure and transportation apparatus

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JP6421062B2 (ja) * 2015-03-20 2018-11-07 克己 櫂谷 薄板状の吸音構造体とその製造法
JP6352336B2 (ja) * 2015-11-27 2018-07-04 株式会社神戸製鋼所 多孔吸音板
JP2017151256A (ja) * 2016-02-24 2017-08-31 宇部エクシモ株式会社 中空構造板及び吸音構造体
CN106836538A (zh) * 2016-12-30 2017-06-13 常熟南师大发展研究院有限公司 一种建筑吸音板
JP7017132B2 (ja) * 2018-09-25 2022-02-08 トヨタ車体株式会社 吸遮音部材の製造方法
CN111186188B (zh) * 2020-01-19 2021-04-27 东风汽车集团有限公司 一种汽车发动机舱的吸音隔热垫

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US7789193B2 (en) * 2006-04-27 2010-09-07 Masao Suzuki Sound insulating device
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EP1598809A1 (fr) 2005-11-23
WO2004075164A1 (fr) 2004-09-02
JP2004264372A (ja) 2004-09-24
JP4050632B2 (ja) 2008-02-20
KR20050106027A (ko) 2005-11-08
CN1754202A (zh) 2006-03-29
EP1598809A4 (fr) 2008-06-04
KR100720639B1 (ko) 2007-05-21

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