EP0892386A2 - Panneau d'isolation acoustique à absorption par résonance - Google Patents

Panneau d'isolation acoustique à absorption par résonance Download PDF

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Publication number
EP0892386A2
EP0892386A2 EP98111639A EP98111639A EP0892386A2 EP 0892386 A2 EP0892386 A2 EP 0892386A2 EP 98111639 A EP98111639 A EP 98111639A EP 98111639 A EP98111639 A EP 98111639A EP 0892386 A2 EP0892386 A2 EP 0892386A2
Authority
EP
European Patent Office
Prior art keywords
support plate
panel
holes
thin sheet
acoustic
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.)
Withdrawn
Application number
EP98111639A
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German (de)
English (en)
Other versions
EP0892386A3 (fr
Inventor
Claudio Barabaschi
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0892386A2 publication Critical patent/EP0892386A2/fr
Publication of EP0892386A3 publication Critical patent/EP0892386A3/fr
Withdrawn legal-status Critical Current

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    • 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 invention relates to a resonance-absorption acoustic-insulation panel, of the type having a thin sheet or diaphragm vibrating when exposed to the action of sound waves, as defined in the preamble of claim 1.
  • porous or spongy panels in which absorption of sound wave energy mainly takes place within the pores, by the combined effect of air viscosity and friction at the pore walls.
  • fibres in porous materials are set in vibration and sound wave energy is converted into heat energy.
  • Porous or spongy panels are generally thick and bulky, can constitute a danger in case of fire if they contain wooden or plastic material fibres or can show environmental incompatibility when they contain glass or rock wool fibres.
  • Panels provided with a perforated front face have a great bulkiness when installed and are quite unacceptable, due to their holes, in environments requiring important hygienic measures and subjected to frequent sanitization operations, such as food industries and hospitals.
  • resonance-absorption acoustic-insulation panels which particularly concern the present invention and which are also called vibrating panels, said panels having thin sheets or diaphragms of non-porous material, devoid of perforations, linked at their outer edges and separated by a thin hollow space from the walls of the environment in which
  • Vibrating panels are of reduced bulkiness in terms of thickness, give satisfactory results in terms of hygiene, because they are neither surface porous nor perforated, and in addition, the acoustic insulation resulting from the phenomenon briefly described above is high.
  • said vibrating panels have the drawback of showing a very selective acoustic absorption, that only takes place with the frequency or frequencies at which the system resonates.
  • a first problem is connected with the fact that application of these vibrating panels must be carefully studied and arranged by previously identifying which are the acoustic frequencies that it is in particular necessary to damp, in a given environment.
  • the technical task underlying the present invention is to devise a resonance-absorption acoustic-insulation panel, capable of obviating the above mentioned drawbacks.
  • Another important aim of the invention is to devise a panel capable of having a high number of resonance frequencies, so as to be able to absorb a wide range of sound waves.
  • a further important aim of the invention is to devise a panel suitable both for environments having high hygienic requirements where frequent sanitization operations are carried out, and for premises of high-humidity atmosphere, and further adapted to environments where fire-prevention features of very high degree are required.
  • a still further object of the invention is to devise a panel of simple structure, low cost and minimum bulkiness.
  • Panel 1 comprises support elements such as anchoring members 1a to a wall, a ceiling or others, and a support plate 2 made of an appropriate material and an appropriate thickness so as to make it substantially rigid.
  • the support plate 2 may have a thickness included between few millimetres and some centimetres, depending on the material of which it is made: if the support plate 2 is made of sheet steel or aluminium, a thickness of few millimetres is sufficient for achieving an appropriate stiffness.
  • the rigid support plate 2 has a first or main face 2a in sight and a second face 2b, opposite to the first one and with said first face defining the plate thickness.
  • the second face 2b is the one turned towards wall 5.
  • the rigid support plate 2 can be directly applied to a wall 5, or any reverberating surface, with the second face 2b merely in contact with or adhering to said surface.
  • the rigid support plate 2 advantageously has a plurality of holes 3 which can have any shape at will and may be of square or circular conformation, for example.
  • Holes 3 are preferably through holes, that is passing through both the first and second faces 2a, 2b, but they may also be blind holes opening onto the first face 2a alone of the rigid support plate 2.
  • Holes 3 have predetermined diameters calculated on the basis of the sound wave frequencies that are to be most damped down by panel 1.
  • holes 3 will have one and the same size. If, on the contrary, the frequency band within which panel 1 is to be efficient must be widened, holes of differentiated diameters are to be provided.
  • the rigid support plate is completely covered, at least at its main face 2a, by a flexible sound-vibrating thin diaphragm or sheet 4.
  • This diaphragm or thin sheet is provided to be substantially devoid of holes and has gauged elasticity and thickness.
  • the flexible diaphragm or thin sheet 4 is made of a continuous aluminium film of a 0.2 mm thickness, smooth on its surface, so that it can be easily washed and sanitized.
  • the thin sheet 4 is fixed to plate 2 in a sealingly adhering manner, for example by gluing onto the support plate 2 portions free of holes 3.
  • Operation and use of the acoustic insulation panel 1 are as follows.
  • each portion of the flexible diaphragm or thin sheet 4 put in register with an underlying hole 3 of the rigid support plate 2 behaves like a resonant or vibrating diaphragm that, if stressed by sound waves of a frequency corresponding to its resonance frequency, begins vibrating thereby dissipating part of the sound energy.
  • This stress causes a loss of force in the incident energy that will be therefore subtracted from the subsequent propagation thereby representing an absorption of sound waves.
  • the greatest acoustic-absorption frequency depends on the width of the underlying holes 3 formed in the rigid support plate 2, thickness and elasticity of the flexible diaphragm or thin sheet 4 being the same.
  • Figs. 4, 5, 6, 7 show by way of example how acoustic-absorption coefficient A of panel 1 varies, based on the measurement method of the "Kundt tube", depending on the sound wave frequencies, considered as included between 0 and 2500 Hz and on the hole diameter in the rigid support plate 2.
  • an acoustic-absorption coefficient A can theoretically vary from a minimum of zero, in case of null absorption, to a maximum of one, in case of full absorption.
  • the measurement method of the "Kundt tube” uses a tube having a sound wave generator forming sine waves in the gas within the tube, at one side, and a piston shiftable along the tube and reflecting sound waves, at the opposite side.
  • Applied to the piston is the acoustic insulation element to be controlled.
  • Fig. 4 refers to a diaphragm or thin sheet 4 of aluminium, of a 0.2 mm thickness, applied to circular holes with a diameter of 20 mm, formed in a rigid support.
  • the acoustic-absorption coefficient A included between zero and one, is shown on the Y axis and the sound wave frequency, considered as included between 0 and 2500 Hz is shown on the X axis. It appears that the greatest acoustic-absorption frequency is included between 2000 and 2500 Hz.
  • Figs. 5, 6, 7 refer to structures similar to the one shown in Fig. 4, but having holes with a diameter of 30, 45 and 80 mm, respectively.
  • the panel in accordance with the invention can be used as a wall or ceiling covering, in contact therewith, and for creating false ceilings.
  • Panel 1 can also be applied close to the reverberating surfaces and not adhering thereto. In this case panel 1 can be parallel to the reverberating surfaces or oblique relative to them.
  • the thus spaced panel is supported at the edges, it is also free to vibrate as a whole, in addition to locally at various points of diaphragm 4.
  • a further resonance frequency is added, i.e. that of the whole panel taken as a body.
  • Panel 1 can also be used as a suspended sound absorber, that is hanging vertically from ceilings, if holes 3 are through holes and the rigid support plate 2 is covered with flexible diaphragms or thin sheets 4 on both its faces 2a, 2b.
  • a process for adjusting the resonance frequency of an acoustic insulation panel is also taught, when said panel is of the type provided with at least one sound-vibrating diaphragm or thin sheet.
  • the process concerns a panel provided with at least one thin sheet that, depending on its physical and structural conditions, has a resonance frequency at which dissipation or absorption of sound energy is maximum.
  • the resonance or maximum-absorption frequency of said diaphragm or thin sheet is determined by engaging the thin sheet in contact with a substantially rigid support plate provided with a plurality of holes, on the one hand, and by selecting the hole sizes in the support plate, on the other hand.
  • a plurality of resonance frequencies of said thin sheet applied to the rigid support plate can be obtained, by forming several holes of different sizes from each other in the support plate itself.
  • the invention achieves important advantages.
  • a vibrating panel has been conceived that, in addition to avoiding the drawbacks of the dissipative panels based on the use of porous or fibrous materials, and the perforated panels, enables a high acoustic-absorption coefficient to be obtained at the frequencies of interest by merely making holes in the support plate having diameters with sizes the operating efficiency of which has been experimentally verified.
  • control of the frequency band in which there is the maximum acoustic-absorption efficiency is achievable by exclusively varying the hole diameters in the support plate, the elasticity and thickness features of the flexible covering thin sheets being unchanged.
  • the panel is of simple structure, low construction cost and reduced installation costs.
  • this panel which can be made of metal materials and sealingly covered with a smooth non-porous and non-perforated thin sheet, is of easy washing and is not inflammable.
EP98111639A 1997-07-18 1998-06-24 Panneau d'isolation acoustique à absorption par résonance Withdrawn EP0892386A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI971702 1997-07-18
IT97MI001702 IT1293727B1 (it) 1997-07-18 1997-07-18 Pannello fonoassorbente ad assorbimento acustico per risonanza e procedimento di regolazione della frequenza di risonanza dello stesso

Publications (2)

Publication Number Publication Date
EP0892386A2 true EP0892386A2 (fr) 1999-01-20
EP0892386A3 EP0892386A3 (fr) 2001-08-29

Family

ID=11377581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98111639A Withdrawn EP0892386A3 (fr) 1997-07-18 1998-06-24 Panneau d'isolation acoustique à absorption par résonance

Country Status (2)

Country Link
EP (1) EP0892386A3 (fr)
IT (1) IT1293727B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008545903A (ja) * 2005-05-28 2008-12-18 エアバス ドイッチュラント ゲゼルシャフト ミット ベシュレンクテル ハフツング 周波数選択２重壁挙動を呈するサンドイッチ構造体
WO2011047429A1 (fr) 2009-10-21 2011-04-28 Bellmax Acoustic Pty Ltd Panneau acoustique
EP2593614A1 (fr) * 2010-07-13 2013-05-22 Bellmax Acoustic Pty Ltd Panneau acoustique
JP2019074626A (ja) * 2017-10-16 2019-05-16 セイコーエプソン株式会社 吸音器およびプロジェクター
CN110832576A (zh) * 2017-07-28 2020-02-21 揖斐电株式会社 吸音部件、车辆用构件和汽车

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990027A (en) * 1957-07-11 1961-06-27 Celotex Corp Composite sound absorber
US4172168A (en) * 1977-07-05 1979-10-23 Firma Carl Freudenberg Lay-flat flooring slab
US4241806A (en) * 1978-10-10 1980-12-30 Metzger Arthur C Noise attenuation panel
US4248647A (en) * 1979-08-07 1981-02-03 Armstrong Cork Company Method for producing acoustical ceiling tile faced with a smooth distortion free decorative thin plastic film
US4301890A (en) * 1979-12-06 1981-11-24 Lord Corporation Sound-absorbing panel
JPH02253297A (ja) * 1989-03-28 1990-10-12 Matsushita Electric Works Ltd 吸音装置
US5241512A (en) * 1991-04-25 1993-08-31 Hutchinson 2 Acoustic protection material and apparatus including such material
US5633067A (en) * 1991-08-26 1997-05-27 Illbruck Production S.A. Engine compartment casing element with perforated foam layer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990027A (en) * 1957-07-11 1961-06-27 Celotex Corp Composite sound absorber
US4172168A (en) * 1977-07-05 1979-10-23 Firma Carl Freudenberg Lay-flat flooring slab
US4241806A (en) * 1978-10-10 1980-12-30 Metzger Arthur C Noise attenuation panel
US4248647A (en) * 1979-08-07 1981-02-03 Armstrong Cork Company Method for producing acoustical ceiling tile faced with a smooth distortion free decorative thin plastic film
US4301890A (en) * 1979-12-06 1981-11-24 Lord Corporation Sound-absorbing panel
JPH02253297A (ja) * 1989-03-28 1990-10-12 Matsushita Electric Works Ltd 吸音装置
US5241512A (en) * 1991-04-25 1993-08-31 Hutchinson 2 Acoustic protection material and apparatus including such material
US5633067A (en) * 1991-08-26 1997-05-27 Illbruck Production S.A. Engine compartment casing element with perforated foam layer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 005 (P-1149), 8 January 1991 (1991-01-08) & JP 02 253297 A (MATSUSHITA ELECTRIC WORKS LTD), 12 October 1990 (1990-10-12) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008545903A (ja) * 2005-05-28 2008-12-18 エアバス ドイッチュラント ゲゼルシャフト ミット ベシュレンクテル ハフツング 周波数選択２重壁挙動を呈するサンドイッチ構造体
WO2011047429A1 (fr) 2009-10-21 2011-04-28 Bellmax Acoustic Pty Ltd Panneau acoustique
US8708097B2 (en) 2009-10-21 2014-04-29 Bellmax Acoustic Pty Ltd. Acoustic panel
EP2491194A4 (fr) * 2009-10-21 2017-01-18 Bellmax Acoustic Pty Ltd Panneau acoustique
EP2593614A1 (fr) * 2010-07-13 2013-05-22 Bellmax Acoustic Pty Ltd Panneau acoustique
US20130133978A1 (en) * 2010-07-13 2013-05-30 Bellmax Acoustic Pty Ltd Acoustic Panel
US8770344B2 (en) * 2010-07-13 2014-07-08 Bellmax Acoustic Pty Ltd. Acoustic panel
EP2593614A4 (fr) * 2010-07-13 2014-12-24 Bellmax Acoustic Pty Ltd Panneau acoustique
CN110832576A (zh) * 2017-07-28 2020-02-21 揖斐电株式会社 吸音部件、车辆用构件和汽车
CN110832576B (zh) * 2017-07-28 2023-05-26 揖斐电株式会社 吸音部件、车辆用构件和汽车
JP2019074626A (ja) * 2017-10-16 2019-05-16 セイコーエプソン株式会社 吸音器およびプロジェクター
JP7006116B2 (ja) 2017-10-16 2022-02-10 セイコーエプソン株式会社 吸音器およびプロジェクター

Also Published As

Publication number Publication date
ITMI971702A1 (it) 1999-01-18
IT1293727B1 (it) 1999-03-10
EP0892386A3 (fr) 2001-08-29

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