EP0405581A1 - Schallabsorbierendes Paneel - Google Patents

Schallabsorbierendes Paneel Download PDF

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Publication number
EP0405581A1
EP0405581A1 EP90112461A EP90112461A EP0405581A1 EP 0405581 A1 EP0405581 A1 EP 0405581A1 EP 90112461 A EP90112461 A EP 90112461A EP 90112461 A EP90112461 A EP 90112461A EP 0405581 A1 EP0405581 A1 EP 0405581A1
Authority
EP
European Patent Office
Prior art keywords
sound absorber
cell
spaces
sound
sound absorption
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.)
Granted
Application number
EP90112461A
Other languages
English (en)
French (fr)
Other versions
EP0405581B1 (de
Inventor
Kyoji Fujiwara
Naoyuki Furuta
Shinta Yamamura
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.)
Nitto Boseki Co Ltd
Original Assignee
Nitto Boseki Co 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 Nitto Boseki Co Ltd filed Critical Nitto Boseki Co Ltd
Publication of EP0405581A1 publication Critical patent/EP0405581A1/de
Application granted granted Critical
Publication of EP0405581B1 publication Critical patent/EP0405581B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • 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
    • E04B2001/8457—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

Definitions

  • the present invention generally relates to a sound absorber for use in indoor acoustic design, outdoor noise suppression, and the like, and particularly relates to a sound absorber having a high sound absorption coefficient in a low frequency range.
  • the plate vibration type As a sound-absorbing structure in the low frequency range, there have been various proposals of the plate vibration type, the perforated plate resonance type, the porous type having a rear air layer, etc.
  • the sound absorption coefficient is increased to 0.4 (sound absorption coefficient by the reverberation chamber method) at the most, which is not high enough.
  • the porous type although the sound absorption coefficient can be considerably improved by provision of a thick rear air layer, the whole structure becomes large in size; for example, the thickness becomes 60 - 100 cm. The porous type, therefore, is not suitable for practical use.
  • the present invention has been accomplished in view of the foregoing conditions, and an object thereof is to provide a sound absorber whose sound absorption coefficient in a low frequency range is high, which does not require large establishment space, and which can be used both indoors and outdoors.
  • the inventors of this application have paid attention to the theory of irregular reflectors by M. R. Schroeder, and have performed various empirical proof tests for the theory. As a result, the inventors have obtained such knowledge that the structure acts as an interference type sound absorber in which acoustic waves different in phase cancel with one another in a frequency range out of the design frequency range and a remarkable sound absorption effect is exhibited particularly in a low frequency range.
  • a sound absorber according to the invention comprises a sound absorber body having an arrangement of a large number of cell-like spaces whose ends are open at one side and closed at the other side, which have different lengths, and part of which having longer lengths are bent so as to be disposed behind adjacent shorter ones.
  • the surface in which the open ends of a large number of cell-like spaces are arranged acts as a sound absorption surface to absorb an acoustic wave, particularly an acoustic wave of a low frequency, incident onto the sound absorption surface.
  • an acoustic wave particularly an acoustic wave of a low frequency
  • the sound absorber has a large number of cell-like spaces different in length, and part of the cell-like spaces having longer lengths are bent so as to be disposed behind adjacent shorter ones, so that the thickness of the sound absorber can be reduced. Therefore, the establishment space for the sound absorber is reduced accordingly.
  • the sound absorber according to the present invention does not utilize a sound absorption effect of a material itself constituting the sound absorber body, it is possible to use, as the material for defining the cell-like spaces, a rigid metal material such as a steel plate causing no acoustic wave internal loss. In this case, problems concerning weatherproof properties and the sanitary problems are not caused, and therefore the sound absorber can be established outdoors or can be used in a hospital and a food factory.
  • the material constituting the body is however not limited to a rigid matter.
  • the open end surface may be covered with a metal thin film such as stainless steel foil and aluminum foil, or a thin film such as a plastic sheet. It has been confirmed that even if the covering with such a thin film hardly affects the sound absorption effect in a low frequency range.
  • the sound absorber covered with a thin-film is particularly suitable for noise suppression in an operating room of a hospital, a food factory, or the like, since it is easily cleaned and hence is kept sanitary.
  • a porous plate such as a glass wool plate, a rock wool plate, a sintered metal plate, and a metal fiber plate may be provided.
  • the provision of such a porous plate is preferable because a high sound absorption coefficient is obtained over the entire frequency range from a low range to a high range.
  • the porous plate may be provided as it is, it is preferable to use a porous plate being covered with a plastic film such as a PVF (polyvinyl fluoride) film, which facilitates handling and cleaning of the sound absorber.
  • PVF polyvinyl fluoride
  • Fig. 1 is a schematic perspective view showing an embodiment of the present invention
  • Fig. 2 is a plan view showing the same embodiment.
  • the sound absorber according to this embodiment has a sound absorber body generally represented by reference numeral 1.
  • the sound absorber body 1 has a large number of cell-like spaces 3 defined by walls 2. One end of each of the cell-like spaces 3 is closed and the other end (an upper end in the drawing) is opened.
  • the cell-like spaces 3 are arranged so that the open ends are in the same plane, which works as a sound absorption surface 4.
  • the cell-like spaces 3 are equal in sectional area to one another, but are different in length from one another. Such cell-like spaces are arranged accordinging to the rule described later.
  • part of the cell-like spaces having longer length are bent so as to be disposed behind adjacent shorter ones as shown in Fig. 3 to thereby reduce the thickness l of the sound absorber.
  • a metal material such as a steel plate and aluminum plate, a plastic material, etc.
  • the respective lengths of the cell-like spaces 3 are selected to be integer times as long as a certain unit length, h.
  • the arrangement of the cell-like spaces 3 is determined on the basis of the quadratic residue series.
  • the quadratic residue series assumes a repetition of the matrix of 7 x 7 shown in Table 1.
  • the horizontal first row and the vertical first column (the left end column) take values of the foregoing one-dimensional series, and each of the remainder positions has a sum value of the values of the corresponding first row and first colunn (in the case where the sum is smaller than 7) or has a value obtained by subtracting a multiple of 7 from the sum (in the case where the sum is larger than 7).
  • Table 1 0 1 4 2 2 4 1 1 2 5 3 3 5 2 4 5 1 6 6 1 5 2 3 6 4 4 6 3 2 3 6 4 4 6 3 4 5 1 6 6 1 5 1 2 5 3 3 5 2
  • the length of the cell-like spaces 3 of the sound absorber 1 shown in Fig. 1 is determined on the basis of the foregoing two-dimensional quadratic residue series, and the values written on the open ends of the cell-like spaces 3 in Figs. 2 and 3 are values from Table 1. These values represent the ratio of the lengths of the cell-like spaces 3. For example, the length shown by the value "2" in Fig. 3 represents 2h; "3", 3h; and "6", 6h.
  • the specific dimensions of the cell-like spaces 3 may be determined with reference to the Schroeder's design conditions for an irregular reflector and in consideration of a desired sound absorption frequency, a desired sound absorption coefficient, an establishment space, a cost, etc. That is, in the Schroeder's irregular reflector designing, the maximum length of the cell-like spaces is designed to be substantially a half of the wavelength corresponding to the design frequency lower limit (irregular reflection occurs in the frequency range not smaller than the lower limit frequency) and the opening side length of the cell-like spaces 3 is designed to be not larger than a half of the wavelength corresponding to the design frequency upper limit (irregular reflection occurs in the frequency range not larger than the upper limit frequency).
  • the dimensions of the cell-like spaces 3 may be determined in accordance with its purposes, uses, and the like so that its sound-absorbing frequency range is located outside the Schroeder's design frequency range (irregular reflection range) of the irregular reflector.
  • the sound absorber body 1 shown in Figs. 1 - 3 may be produced in the form of an integrated body as a whole.
  • the integral formation of the whole body is difficult in production and hence causes a cost increase. Accordingly, it is preferable to produce the whole body from a plurality of divisional parts.
  • the sound absorber body 1 may be produced such that blocks each having one or a plurality of cell-like spaces are first produced and the blocks are suitably combined with one another to constitute the sound absorber body 1.
  • the sound absorber body 1 may have a structure of four layers 1a, 1b, 1c, and 1d as shown in Fig. 4. In this latter case, the sound absorber body 1 is produced such that the four layers are produced separately and then integrated to form the sound absorber body 1.
  • the layers 1a - 1d have structures shown in the diagrams (a), (b), (c), and (d) of Fig. 5, respectively.
  • the portions illustrated by hatching 5 in the diagram (a) of Fig. 5 show walls formed on upper surfaces of the cell-like spaces 3 so that the length of the cell-like spaces 3 of these portions is made to be zero, and the portions illustrated by hatching 6 in the diagrams (a) - (d) of Fig. 5 represent bottom walls.
  • Each of the sound absorber bodies 1 of Figs. 1 and 4 can be used as a sound absorber as it is. That is, a large number of sound absorber bodies 1 are arranged so that the sound absorption surfaces 4 form the same plane which is to become a sound absorption wall.
  • Fig. 6 shows another embodiment of the present invention.
  • a thin film is provided on the sound absorption surface 4 of the absorber body 1 of Fig. 1 so as to cover the open ends of the cell-like spaces 3 of the sound absorber body 1.
  • the thin film 7 used in this embodiment it is possible to use a metal thin film such as a stainless steel film and an aluminum film, a plastic sheet, etc. The provision of such a thin film 7 on the sound absorption surface 4 as illustrated in this embodiment facilitates cleaning of the sound absorber 1.
  • Fig. 7 is a further embodiment of the present invention.
  • a porous plate 8 is provided on the sound absorption surface 4 of the sound absorber body 1 of Fig. 1 so as to cover the open ends of the cell-like spaces 3 formed in the sound absorber 1.
  • the porous plate 8 to be used in this embodiment it is possible to use a glass wool plate, a rock wool plate, a sintered metal plate, a metal fiber plate, and the like as it is or with a covering plastic film.
  • a perforated plate material of a hard board, a plaster board, plywood, and the like may be used.
  • a large number of sound absorbers of Fig. 6 or 7 may also be arranged side by side to constitute a sound absorption wall.
  • the open end surface of the sound absorber body of Example I was covered with a stainless steel thin film (200 ⁇ m thickness). See Fig. 6.
  • the open end surface of the sound absorber body of Example I was covered with a glass wool plate (32 kg/m3 density and 10 mm thickness. See Fig. 7.
  • Example 1 showed a high sound absorption coefficient not only in the low frequency range (about 315 Hz) but in the intermediate range (800 Hz).
  • Example II showed a high sound absorption coefficient substantially the same as Example I in the low frequency range though it has a slightly lower coefficient than Example I in the intermediate range. Therefore, the sound absorber of Example II has sufficient practicality, specifically when sanitary reasons are taken into account.
  • Example III showed a high sound absorption coefficient in the entire frequency range. As will be well seen from comparison with Comparative Example, the sound absorption coefficient of Example III in the low frequency range is remarkably improved, while the glass wool plate itself merely shows a low sound absorption coefficient over the frequency range from the low range to the intermediate range. Therefore, if a glass wool plate coated with a plastic thin film such as a PVF (polyvinyl fluoride) film is combined with the sound absorber, an excellent sound absorption apparatus having good weatherproof properties can be realized.
  • a plastic thin film such as a PVF (polyvinyl fluoride) film
  • the cell-like spaces 3 formed in the sound absorber body 1 are illustrated to have a regular square section in the foregoing embodiments, the cross section is not limited to that one, but may be selected to be rectangular, triangular, circular, or the like. Further, although in the foregoing embodiments a plurality of cell-like spaces 3 are arranged such that the open ends thereof are disposed in the same plane, it is not always necessary to dispose the open ends in the same plane, but the cell-like spaces 3 may be arranged with their open ends displaced in their longitudinal direction.
  • the sound absorber according to the present invention shows a high sound absorption coefficient (for example, about 0.9) over the frequency range from the low range to the intermediate range without much increasing the thickness of the sound absorber (for example, about 30 cm). Further, it is possible to use a metal material such as a steel plate and an aluminum plate, so that the sound absorber according to the present invention is easy in production and excellent in weatherproof property. Furthermore, reduction in weight can be obtained by using a plastic material.
  • the sound absorber according to the present invention therefore, has an advantage that it can be very effectively used for an indoor or outdoor sound absorption structure for absorbing sound in the low frequency range.
  • the sound absorber in which the open end surfaces of the cell-like spaces are covered with a metal thin film such as stainless steel foil and aluminum foil, or a thin film such as a plastic sheet is suitable for noise suppression in an operating room of a hospital, in a food factory, and the like, because the sound absorber is easily cleaned and therefore is kept sanitary.
  • the sound absorber in which a porous material is provided on the open end surfaces of the cell-like spaces can be utilized as a very excellent sound absorber because such a sound absorber shows a high sound absorption coefficient over the entire frequency range from the low range to the high range.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)
EP19900112461 1989-06-30 1990-06-29 Schallabsorbierendes Paneel Expired - Lifetime EP0405581B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP169140/89 1989-06-30
JP1169140A JP2933322B2 (ja) 1989-06-30 1989-06-30 吸音体

Publications (2)

Publication Number Publication Date
EP0405581A1 true EP0405581A1 (de) 1991-01-02
EP0405581B1 EP0405581B1 (de) 1993-10-27

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EP19900112461 Expired - Lifetime EP0405581B1 (de) 1989-06-30 1990-06-29 Schallabsorbierendes Paneel

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EP (1) EP0405581B1 (de)
JP (1) JP2933322B2 (de)
DE (1) DE69004166T2 (de)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683480A1 (de) * 1994-05-17 1995-11-22 M. Faist GmbH & Co. KG Schallabsorber
WO1996023294A1 (de) * 1995-01-27 1996-08-01 Rieter Automotive (International) Ag μ/4-SCHALLABSORBER
WO1999028558A2 (en) * 1997-11-27 1999-06-10 Taiji Date Sound absorbing building blocks
WO1999040567A1 (de) * 1998-02-05 1999-08-12 Woco Franz-Josef Wolf & Co. Flächenabsorber für schallwellen
EP1046749A2 (de) * 1999-04-22 2000-10-25 Nichias Corporation Schalldämmende Struktur
EP1343142A2 (de) * 1994-08-31 2003-09-10 Mitsubishi Electric Home Appliance Co., Ltd Schalldämpfungseinrichtung unter Verwendung eines porösen Materials
WO2003076736A1 (en) * 2002-03-14 2003-09-18 Wienerberger Bricks N.V. Acoustic construction element
CN102474692A (zh) * 2010-05-27 2012-05-23 松下电器产业株式会社 超声波探头及其制造方法
CN102737627A (zh) * 2012-06-15 2012-10-17 中国石油天然气股份有限公司 反二次余数扩散低频消声降噪复合模板
CN105719634A (zh) * 2014-12-04 2016-06-29 北京市劳动保护科学研究所 宽带复合吸声结构
CN105719638A (zh) * 2014-12-04 2016-06-29 北京市劳动保护科学研究所 复合共振吸声结构
CN105810186A (zh) * 2014-12-30 2016-07-27 北京市劳动保护科学研究所 一种复合吸声结构
CN108154875A (zh) * 2018-01-31 2018-06-12 同济大学 三维多腔微穿孔周期超宽频带吸声结构
CN108305608A (zh) * 2017-11-14 2018-07-20 同济大学 双声阻抗周期微穿孔超宽频带吸声结构
CN108374359A (zh) * 2017-11-14 2018-08-07 同济大学 两维伪随机序列微穿孔超宽频带吸声结构
CN108385849A (zh) * 2017-11-14 2018-08-10 同济大学 三维双声阻抗微穿孔周期超宽频带表面平齐吸声结构
CN109581848A (zh) * 2017-09-28 2019-04-05 富士施乐株式会社 降噪结构和图像形成设备
CN111636761A (zh) * 2020-06-10 2020-09-08 湖南大学 一种施工场地隔声装置
CN112185327A (zh) * 2020-09-16 2021-01-05 西安交通大学 一种微缝低频吸声单元及具有其的嵌套式宽带吸声结构
CN113002695A (zh) * 2021-03-05 2021-06-22 西北工业大学 基于泡沫超构表面的水下三明治隔声结构
CN114909223A (zh) * 2021-02-08 2022-08-16 中国航发商用航空发动机有限责任公司 航空发动机声衬装置以及航空发动机
EP4120243A4 (de) * 2020-03-13 2023-08-09 Pixie Dust Technologies, Inc. Schallabsorbierende struktur und schallabsorbierende wand
US20230349151A1 (en) * 2022-04-28 2023-11-02 Toyota Motor Engineering & Manufacturing North America, Inc. Sound absorber and sound absorbing device

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JP2785687B2 (ja) * 1994-05-02 1998-08-13 ヤマハ株式会社 吸音構造体
US10174675B2 (en) 2015-12-30 2019-01-08 General Electric Company Acoustic liner for gas turbine engine components
US11059559B2 (en) 2018-03-05 2021-07-13 General Electric Company Acoustic liners with oblique cellular structures
US11047304B2 (en) 2018-08-08 2021-06-29 General Electric Company Acoustic cores with sound-attenuating protuberances
US10823059B2 (en) 2018-10-03 2020-11-03 General Electric Company Acoustic core assemblies with mechanically joined acoustic core segments, and methods of mechanically joining acoustic core segments
US11434819B2 (en) 2019-03-29 2022-09-06 General Electric Company Acoustic liners with enhanced acoustic absorption and reduced drag characteristics
US11668236B2 (en) 2020-07-24 2023-06-06 General Electric Company Acoustic liners with low-frequency sound wave attenuating features
US11970992B2 (en) 2021-06-03 2024-04-30 General Electric Company Acoustic cores and tools and methods for forming the same
WO2023021916A1 (ja) * 2021-08-17 2023-02-23 ピクシーダストテクノロジーズ株式会社 吸音部材及び吸音壁
US11965425B2 (en) 2022-05-31 2024-04-23 General Electric Company Airfoil for a turbofan engine
JP2024090363A (ja) * 2022-12-23 2024-07-04 三菱重工業株式会社 吸遮音構造体

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US3693750A (en) * 1970-09-21 1972-09-26 Minnesota Mining & Mfg Composite metal structure useful in sound absorption
FR2214932A1 (de) * 1973-01-24 1974-08-19 Lockheed Aircraft Corp
US4384020A (en) * 1980-12-22 1983-05-17 Rohr Industries, Inc. Honeycomb noise attenuating structures

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US1972563A (en) * 1933-01-31 1934-09-04 Irvin Richard Acoustic construction
US3693750A (en) * 1970-09-21 1972-09-26 Minnesota Mining & Mfg Composite metal structure useful in sound absorption
FR2214932A1 (de) * 1973-01-24 1974-08-19 Lockheed Aircraft Corp
US4384020A (en) * 1980-12-22 1983-05-17 Rohr Industries, Inc. Honeycomb noise attenuating structures

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683480A1 (de) * 1994-05-17 1995-11-22 M. Faist GmbH & Co. KG Schallabsorber
EP1343142A2 (de) * 1994-08-31 2003-09-10 Mitsubishi Electric Home Appliance Co., Ltd Schalldämpfungseinrichtung unter Verwendung eines porösen Materials
EP1343142A3 (de) * 1994-08-31 2004-06-16 Mitsubishi Electric Home Appliance Co., Ltd Schalldämpfungseinrichtung unter Verwendung eines porösen Materials
WO1996023294A1 (de) * 1995-01-27 1996-08-01 Rieter Automotive (International) Ag μ/4-SCHALLABSORBER
WO1999028558A2 (en) * 1997-11-27 1999-06-10 Taiji Date Sound absorbing building blocks
WO1999028558A3 (en) * 1997-11-27 2000-09-14 Taiji Date Sound absorbing building blocks
WO1999040567A1 (de) * 1998-02-05 1999-08-12 Woco Franz-Josef Wolf & Co. Flächenabsorber für schallwellen
US6568135B1 (en) * 1999-04-22 2003-05-27 Nichias Corporation Sound absorbing structure
EP1046749A3 (de) * 1999-04-22 2003-07-16 Nichias Corporation Schalldämmende Struktur
EP1046749A2 (de) * 1999-04-22 2000-10-25 Nichias Corporation Schalldämmende Struktur
WO2003076736A1 (en) * 2002-03-14 2003-09-18 Wienerberger Bricks N.V. Acoustic construction element
CN102474692A (zh) * 2010-05-27 2012-05-23 松下电器产业株式会社 超声波探头及其制造方法
CN102737627A (zh) * 2012-06-15 2012-10-17 中国石油天然气股份有限公司 反二次余数扩散低频消声降噪复合模板
CN102737627B (zh) * 2012-06-15 2014-09-17 中国石油天然气股份有限公司 反二次余数扩散低频消声降噪复合模板
CN105719634A (zh) * 2014-12-04 2016-06-29 北京市劳动保护科学研究所 宽带复合吸声结构
CN105719638A (zh) * 2014-12-04 2016-06-29 北京市劳动保护科学研究所 复合共振吸声结构
CN105810186A (zh) * 2014-12-30 2016-07-27 北京市劳动保护科学研究所 一种复合吸声结构
CN109581848A (zh) * 2017-09-28 2019-04-05 富士施乐株式会社 降噪结构和图像形成设备
CN109581848B (zh) * 2017-09-28 2023-01-13 富士胶片商业创新有限公司 降噪结构和图像形成设备
CN108305608A (zh) * 2017-11-14 2018-07-20 同济大学 双声阻抗周期微穿孔超宽频带吸声结构
CN108385849A (zh) * 2017-11-14 2018-08-10 同济大学 三维双声阻抗微穿孔周期超宽频带表面平齐吸声结构
CN108374359A (zh) * 2017-11-14 2018-08-07 同济大学 两维伪随机序列微穿孔超宽频带吸声结构
CN108154875A (zh) * 2018-01-31 2018-06-12 同济大学 三维多腔微穿孔周期超宽频带吸声结构
EP4120243A4 (de) * 2020-03-13 2023-08-09 Pixie Dust Technologies, Inc. Schallabsorbierende struktur und schallabsorbierende wand
CN111636761A (zh) * 2020-06-10 2020-09-08 湖南大学 一种施工场地隔声装置
CN112185327A (zh) * 2020-09-16 2021-01-05 西安交通大学 一种微缝低频吸声单元及具有其的嵌套式宽带吸声结构
CN114909223A (zh) * 2021-02-08 2022-08-16 中国航发商用航空发动机有限责任公司 航空发动机声衬装置以及航空发动机
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CN113002695B (zh) * 2021-03-05 2022-07-29 西北工业大学 基于泡沫超构表面的水下三明治隔声结构
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JP2933322B2 (ja) 1999-08-09
JPH0333897A (ja) 1991-02-14
EP0405581B1 (de) 1993-10-27
DE69004166D1 (de) 1993-12-02
DE69004166T2 (de) 1994-04-21

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