US3786898A - Muffling block - Google Patents

Muffling block Download PDF

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Publication number
US3786898A
US3786898A US00315483A US3786898DA US3786898A US 3786898 A US3786898 A US 3786898A US 00315483 A US00315483 A US 00315483A US 3786898D A US3786898D A US 3786898DA US 3786898 A US3786898 A US 3786898A
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United States
Prior art keywords
blocks
sound
unit
block
absorbing
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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.)
Expired - Lifetime
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US00315483A
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English (en)
Inventor
S Fujii
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Fujii Kogyo KK
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Fujii Kogyo KK
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    • 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
    • E04B1/8404—Sound-absorbing elements block-shaped
    • 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
    • E04B2001/8414—Sound-absorbing elements with non-planar face, e.g. curved, egg-crate shaped
    • E04B2001/8419—Acoustical cones or the like, e.g. for anechoic chambers

Definitions

  • the unit consists of two kinds of blocks, one being shorter and having a lower density than the other.
  • every unit is fixed to a wall or ceiling so that a discontinuous side of each unit faces away from the surface of the wall or ceiling and a smooth side thereof. 18 fixed to the latter.
  • Every uriit consists of four or five sound-absorbing blocks which 10 Claims, 10 Drawing Figures PATENTED JAN 2 2 I974 sum 1 or 3 F ig.2b
  • This invention relates to a unit for absorbing sound, especially to a unit composed of blocks and capable of absorbing low-pitch sound effectively, and which is of simple construction.
  • FIG. 4a A known block for use in this type of unit is shown in FIG. 4a.
  • the block is shaped like a wedge at one end and is arranged together with several similar blocks in a mosaic pattern, the assembled blocks being secured to a frame before use.
  • FIG. 5 An arrangement of the blocks of FIG. 4a is shown in FIG. 5.
  • FIG. 4b shows the results of experiments in which the relation between the length T of the wedgeshaped portion of such blocks and the frequency (Hz) of the sound absorbed was determined.
  • the curve in this Figure which was obtained for 98 percent soundabsorption, is seen to be linear and is inclined at an angle of 45 to the vertical.
  • the data in this Figure is applicable where the width (B) of the wedge-shaped portion at its widest point is between and 30 cm. and where the density of the glass fibers of which the blocks are composed is between and 64 kg/m.
  • the length (T) of the wedgeshaped portion should be 60 cm., whereas if the sound has a frequency of 100 Hz, the length (T) should be 85 cm.
  • the length of the wedge portion (T) should be longer and the thickness of the absorbing wall or the depth of the block should also be increased.
  • FIG. 2a Another known construction, proposed by the instant applicant, is shown in FIG. 2a.
  • the unit (3') shown in this Figure is composed of glass fiber, soundabsorbing blocks (1) and (2') having the same width and density but being of different lengths, the blocks (1') being longer than the blocks (2').
  • the blocks (1') and (2) are alternately arranged and are secured to a non-illustrated frame.
  • curve a in FIG. 3 which indicates that 98 percent sound-absorption is obtained only at frequencies of 120 Hz or so whereas at frequencies of about 200 Hz, the percentage of sound-absorption becomes very low.
  • wedge-shaped blocks are effective in absorbing low-pitched sound.
  • such blocks have the disadvantage that the effective area of a sound-absorbing chamber wherein they are utilized is greatly reduced.
  • Another object of the present invention is to provide a unit comprising sound-absorbing blocks which is effective for absorbing low-pitched sound and which does not require a large decrease in the effective area of a sound-absorbing chamber in which it is utilized in order to be effective.
  • FIG. 1 is a perspective view of a unit of alternately arranged longer and shorter sound-absorbing blocks in accordance with the invention.
  • FIG. 2a is a side view of known sound-absorbing blocks fixed together.
  • FIG. 2b is a side view of one embodiment according to the invention showing the relationship between the lengths of the longer and shorter blocks.
  • FIG. 2c is a view similar to FIG. 2b but showing another embodiment of the present invention.
  • FIG. 3 is a diagram showing the percentage soundabsorption for the embodiments of FIGS. 2a, 2b and 2c.
  • FIG. 4a is a perspective view of a known soundabsorbing block.
  • FIG. 4b is a graph showing the relationship, at 98 percent sound-absorption, between the length of the wedge-shaped portion of the block of FIG. 4a and the frequency of the sound absorbed.
  • FIG. 5 is a perspective view showing a unit composed of the blocks of FIG. 4a.
  • FIG. 6a is a perspective view showing one arrangement of units of sound-absorbing blocks according to the invention mounted on a wall frame.
  • FIG. 6b is a view similar to FIG. 6a but showing a different arrangement.
  • the numeral 1 denotes soundabsorbing blocks made of a material such as glass fibers and having a highdensity (d).
  • the numeral 2 denotes sound-absorbing blocks made of glass fibers and having a low density (d).
  • the blocks 1 and 2 have the shape of an oblong, flat box.
  • the blocks 1 are of greater width than the blocks 2 although the blocks 1 and 2 have the same thickness.
  • a unit 3 comprises a plurality of blocks 1 and 2, as shown in FIGS. 1, 2b and 2c,-which are fixed relative to one another by a suitable frame or by adhesive means.
  • the blocks 1 and 2 are arranged alternately so that a wider block is always located adjacent a narrower block.
  • the curves b and c in FIG. 3 correspond, respectively, to FIGS. 2b and 20. It is seen that 98 percent sound absorption may be obtained at frequencies as low as 140 and 100 Hz for the respective structures of FIGS. 2b and 20. This means that, in the case of FIG. 2c, the low-pitched sound to be absorbed by 98 percent may have a frequency as low as 100 Hz.
  • the experimental data of FIG. 3 show that, by suitably combining wider and narrower blocks having different densities, most sound from the high-frequency to the lowfrequency range can be effectively absorbed.
  • the present invention by varying the densities and lengths of the blocks, it becomes possible to absorb the sound in a sound-absorbing chamber as desired.
  • the invention has a remarkable sound-absorbing effect.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
US00315483A 1972-09-06 1972-12-15 Muffling block Expired - Lifetime US3786898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972103249U JPS5243281Y2 (enrdf_load_stackoverflow) 1972-09-06 1972-09-06

Publications (1)

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US3786898A true US3786898A (en) 1974-01-22

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US00315483A Expired - Lifetime US3786898A (en) 1972-09-06 1972-12-15 Muffling block

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Country Link
US (1) US3786898A (enrdf_load_stackoverflow)
JP (1) JPS5243281Y2 (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD249367S (en) 1975-09-11 1978-09-12 Charles Industries Corporation Decorative acoustical panel
US4682670A (en) * 1986-07-28 1987-07-28 Mega/Erg, Incorporated Portable adjustable acoustic absorber
US5623130A (en) * 1995-11-20 1997-04-22 Noxon; Arthur M. System for enhancing room acoustics
US5834711A (en) * 1997-07-09 1998-11-10 Johns Manville International, Inc. Sound control through resonance damping
US6364054B1 (en) 2000-01-27 2002-04-02 Midas International Corporation High performance muffler
US20070193175A1 (en) * 2006-02-21 2007-08-23 Ta-Chung Hao Structure of decoration acoustic board
US20080223653A1 (en) * 2007-03-16 2008-09-18 Seoul National University Industry Foundation Poroelastic acoustical foam having enhanced sound-absorbing performance
GB2472182A (en) * 2009-06-04 2011-02-02 Mach Acoustics Ltd Air Vent
US20110168484A1 (en) * 2010-01-08 2011-07-14 Lenz Richard L Systems and methods for providing an asymmetric cellular acoustic diffuser
CN103469910A (zh) * 2013-08-14 2013-12-25 苏州岸肯电子科技有限公司 可调节高度的吸音尖劈
USD821613S1 (en) * 2015-07-03 2018-06-26 Arktura, Llc Architectural fixture
US20190115002A1 (en) * 2017-10-16 2019-04-18 The Hong Kong University Of Science And Technology Sound absorber with stair-stepping structure
US20220247852A1 (en) * 2019-09-11 2022-08-04 mutum GmbH Limiting Sound Emissions in Speech Detection Arrangements
US11929053B2 (en) 2019-09-11 2024-03-12 The Hong Kong University Of Science And Technology Broadband sound absorber based on inhomogeneous-distributed Helmholtz resonators with extended necks

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5514650Y2 (enrdf_load_stackoverflow) * 1975-01-27 1980-04-03

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1790938A (en) * 1931-02-03 Charles lionel mabcus
US1875074A (en) * 1927-08-05 1932-08-30 Masonite Corp Acoustical board
US1878409A (en) * 1929-03-06 1932-09-20 Amy Aceves & King Inc Apparatus and method for the absorption of sound
US1976282A (en) * 1932-02-24 1934-10-09 Izumiyama Kichiro Acoustic wall board
US2200650A (en) * 1937-04-10 1940-05-14 Arthur R Welch Composite board
US2549189A (en) * 1945-01-23 1951-04-17 Gabo Naum Building construction unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1790938A (en) * 1931-02-03 Charles lionel mabcus
US1875074A (en) * 1927-08-05 1932-08-30 Masonite Corp Acoustical board
US1878409A (en) * 1929-03-06 1932-09-20 Amy Aceves & King Inc Apparatus and method for the absorption of sound
US1976282A (en) * 1932-02-24 1934-10-09 Izumiyama Kichiro Acoustic wall board
US2200650A (en) * 1937-04-10 1940-05-14 Arthur R Welch Composite board
US2549189A (en) * 1945-01-23 1951-04-17 Gabo Naum Building construction unit

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD249367S (en) 1975-09-11 1978-09-12 Charles Industries Corporation Decorative acoustical panel
US4682670A (en) * 1986-07-28 1987-07-28 Mega/Erg, Incorporated Portable adjustable acoustic absorber
US5623130A (en) * 1995-11-20 1997-04-22 Noxon; Arthur M. System for enhancing room acoustics
US5834711A (en) * 1997-07-09 1998-11-10 Johns Manville International, Inc. Sound control through resonance damping
US6364054B1 (en) 2000-01-27 2002-04-02 Midas International Corporation High performance muffler
US20070193175A1 (en) * 2006-02-21 2007-08-23 Ta-Chung Hao Structure of decoration acoustic board
US20080223653A1 (en) * 2007-03-16 2008-09-18 Seoul National University Industry Foundation Poroelastic acoustical foam having enhanced sound-absorbing performance
GB2472182A (en) * 2009-06-04 2011-02-02 Mach Acoustics Ltd Air Vent
US20110168484A1 (en) * 2010-01-08 2011-07-14 Lenz Richard L Systems and methods for providing an asymmetric cellular acoustic diffuser
US8424637B2 (en) * 2010-01-08 2013-04-23 Richard L. Lenz, Jr. Systems and methods for providing an asymmetric cellular acoustic diffuser
CN103469910A (zh) * 2013-08-14 2013-12-25 苏州岸肯电子科技有限公司 可调节高度的吸音尖劈
CN103469910B (zh) * 2013-08-14 2016-06-29 苏州岸肯电子科技有限公司 可调节高度的吸音尖劈
USD821613S1 (en) * 2015-07-03 2018-06-26 Arktura, Llc Architectural fixture
USD849274S1 (en) * 2015-07-03 2019-05-21 Arktura Llc Architectural fixture
US20190115002A1 (en) * 2017-10-16 2019-04-18 The Hong Kong University Of Science And Technology Sound absorber with stair-stepping structure
US10796680B2 (en) * 2017-10-16 2020-10-06 The Hong Kong University Of Science And Technology Sound absorber with stair-stepping structure
US20220247852A1 (en) * 2019-09-11 2022-08-04 mutum GmbH Limiting Sound Emissions in Speech Detection Arrangements
US11831797B2 (en) * 2019-09-11 2023-11-28 mutum GmbH Limiting sound emissions in speech detection arrangements
US11929053B2 (en) 2019-09-11 2024-03-12 The Hong Kong University Of Science And Technology Broadband sound absorber based on inhomogeneous-distributed Helmholtz resonators with extended necks

Also Published As

Publication number Publication date
JPS4961809U (enrdf_load_stackoverflow) 1974-05-30
JPS5243281Y2 (enrdf_load_stackoverflow) 1977-10-01

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