AU2008100620A4 - An acoustic panel and a method of manufacturing acoustic panels - Google Patents
An acoustic panel and a method of manufacturing acoustic panels Download PDFInfo
- Publication number
- AU2008100620A4 AU2008100620A4 AU2008100620A AU2008100620A AU2008100620A4 AU 2008100620 A4 AU2008100620 A4 AU 2008100620A4 AU 2008100620 A AU2008100620 A AU 2008100620A AU 2008100620 A AU2008100620 A AU 2008100620A AU 2008100620 A4 AU2008100620 A4 AU 2008100620A4
- Authority
- AU
- Australia
- Prior art keywords
- cells
- acoustic panel
- apertures
- acoustic
- boundary
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
-
- 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
- E04B1/86—Sound-absorbing elements slab-shaped
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
- E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
- E04C2/365—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels by honeycomb structures
-
- 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
- E04B2001/742—Use of special materials; Materials having special structures or shape
- E04B2001/748—Honeycomb materials
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Multimedia (AREA)
- Electromagnetism (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Building Environments (AREA)
Description
(O
00
O
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION Innovation Patent Applicant: ASHMERE HOLDINGS PTY LTD Invention Title: AN ACOUSTIC PANEL AND A METHOD OF MANUFACTURING ACOUSTIC PANELS The following statement is a full description of this invention, including the best method for performing it known to us: P4622.AU2 PoSo _F-ing Appi,-otiof 2008-7-4doc (P) 00 -2 AN ACOUSTIC PANEL AND A METHOD OF MANUFACTURING ACOUSTIC PANELS c, Field of the Invention C 5 The present invention relates to an acoustic panel of the
\O
type which includes a cellular core structure sandwiched _between two face sheets. The present invention also 00 relates to a method of manufacturing acoustic panels.
(1 Background of the Invention io It is known to provide a panel which includes a honeycomb core structure defining a plurality of generally hexagonal shaped cells, and a face sheet adhesively bonded to each side of the honeycomb structure so as to sandwich the honeycomb structure between the sheets. Such panels are in common use as internal walls, ceilings, and partitions in aircraft, ships and trains due to their low weight and high stiffness.
However, such panels provide very little absorption to incident sound. In order to improve the sound absorption characteristics of the panels, additional sound absorptive materials such as polymer foams have been used to cover the panels. If the sound to be absorbed is of relatively low frequency, the sound absorptive materials need to be relatively thick. This increases the weight and cost of the panels and can also constitute a fire hazard.
An alternative arrangement for improving the sound absorption characteristics of a panel is to perforate one of the sheets with holes of several millimetres diameter, the ratio of the area defined by the perforations to the cross sectional area defined by the cells being greater than 10%. The holes and the volume of air in the cells form Helmholtz resonators which serve to absorb some of the sound incident on the panels.
N:kPerthnCases\Patant\46OO46999\P46212AU.2\SpecisP4621 2AU.2 Specification 2008-7-I doc 4/07/08 00 ZHowever, since the acoustic resistance of such holes is very small, the frequency range for sound absorption is narrow. To improve the frequency range, a sound absorption layer is usually placed behind the panel. In addition, since the resonance frequency of the Helmholtz resonators 0 formed by the cells is relatively high (greater than 1500 O Hz), such acoustic panels are relatively ineffective for a 00 relatively low frequency range (below 1000 Hz) where noise 0io absorption is greatly needed.
Summary of the Invention In accordance with a first aspect of the present invention, there is provided an acoustic panel including: a sandwich structure formed by a first boundary member, a second boundary member and a first core structure disposed between the first and second boundary members the first and second boundary members and the first core structure defining a plurality of cells and the first boundary member being provided with apertures through which sound may pass into the cells during use, wherein at least some of the cells each have an associated aperture area which is less than or substantially equal to the area of a substantially circular aperture of imm diameter.
Preferably, the diameter of at least some of the apertures is substantially within the range 0.3 mm to imm.
In this specification, the percentage open area is defined as the percentage of open area defined by the apertures on the first boundary member per unit area of the first boundary member. The percentage open area is preferably within the range 1% to 4%.
N kPerth\CasesNPatentk460DO-46999P46212.AU.2\Specis\P46212.AU.2 Speification 2008-7-1 doc 4/07108 00 In one embodiment, the core structure is a honeycomb structure and each of the cells has a generally hexagonal cross-sectional shape.
In an alternative embodiment, the core structure defines a O plurality of triangular or circular cells.
IND
Preferably, at least some of the cells have one associated 00 aperture.
C In an alternative arrangement, at least some of the cells have a plurality of associated apertures.
In one arrangement, the first boundary member is provided with apertures of varying sizes. In addition, or alternatively, the first boundary member is provided with apertures of varying perforation densities so as to define a varying percentage open area over the first boundary member.
In one arrangement, the acoustic panel includes two or more first core structures fixed to each other so as to increase the effective volume of the cells. The two or more first core structures may be in register with each other or out of register with each other.
In one arrangement, the acoustic panel further includes an intermediate sheet disposed between adjacent core structures, the intermediate sheet being provided with a plurality of apertures.
In one embodiment, the acoustic panel further includes a third boundary member and a second core structure disposed between the second boundary member and the third boundary member, the second boundary member, the third boundary member and the second core structure defining a plurality of cells, and the third boundary member being provided with apertures through which sound may pass into the cells N:\Perth\Cases\Patent\460O46 999P46212. AU 2\Specis\P46212.AU.2 Specfication 2008-7-l.doc 4/07108 00 Sduring use, wherein at least some of the cells each have an associated aperture area which is less than or substantially equal to the area of a substantially circular aperture of imm diameter.
In accordance with a second aspect of the present C invention, there is provided a method of manufacturing a NO perforated acoustic panel, said method including the steps of: 00 providing a first boundary member, a second boundary C o10 member and a first core structure disposing the core structure between the first and second boundary members and fixing the first core structure to the first and second boundary members; the first and second boundary members and the first core structure defining a plurality of cells and the first boundary member being provided with apertures through which sound may pass during use, wherein at least some of the cells each have an associated aperture area which is less than or substantially equal to the area of a substantially circular aperture of imm diameter.
The diameter of at least some of the apertures is preferably substantially within the range 0.3mm to imm.
Preferably, the percentage open area is within the range 1% to 4%.
In a preferred embodiment, the core structure is a honeycomb structure and each of the cells has a generally hexagonal cross-sectional shape.
Preferably, the method further includes the step of selecting the desired percentage open area, the depth of N:\Perth\Cases\Patent\4600-46999\P46212.AU 2\Specis\P46212.AU.2 Specification 2008-7-1 doc 4/07/08 -6the first core structure, the volume of each cell, and/or
(N
the flexural stiffness of the first core structure so as to construct an acoustic panel having a desired sound absorption frequency range and a desired peak sound absorption coefficient.
In one arrangement, the method further includes the steps ND of providing two or more first core structures and fixing Sthe first core structures together so as to increase the 00 effective volume of the cells. The two or more first core io structures may be in register with each other or out of register with each other.
In one arrangement, the method further includes the step of providing a perforated intermediate sheet between adjacent core structures.
In one embodiment, the method further includes the steps of providing a third boundary member and a second core structure, and fixing the second core structure between the second and third boundary members, the second and third boundary members and the second core structure defining a plurality of cells, and the third boundary member being provided with apertures through which sound may pass into the cells during use, wherein at least some of the cells have an associated aperture area which is less than or substantially equal to the area of a substantially circular aperture of imm diameter.
In accordance with a third aspect of the present invention, there is provided an acoustic panel including: a sandwich structure formed by a first boundary member, a second boundary member, and at least two core structures disposed between the first and second boundary members; each of the core structures defining a plurality of cells; N:\Perth\Cases\Patent\46000-46999\P46212 AU2\Specis\P46212 AU.2 Specification 2008-7-1 doc 4/07/08 00 7 O the first boundary member being provided with a plurality of apertures; and at least one pair of an adjacent two core structures being disposed relative to each other such that the s respective cells of the core structures are out of register with each other.
ON
SBrief Description of the Drawings 00 The present invention will now be described, by way of example only, with reference to the accompanying drawings, in which Figure 1 is a diagrammatic partially cut away plan view of an acoustic panel in accordance with an embodiment of the present invention; Figure 2 is a diagrammatic cross-sectional view of several adjacent cells of the panel shown in Figure 1; and Figure 3 is a graph illustrating plots of sound absorption co-efficient verses frequency for various types of acoustic panels of the type shown in Figures 1 and 2; Figure 4 is a diagrammatic plan view of portions of first and second core structures of an acoustic panel in accordance with an alternative embodiment of the present invention; and Figure 5 is a diagrammatic cross-sectional view of several adjacent cells of the panel shown in Figure 1 taken along the line V-V in the direction of the arrows.
Description of a Preferred Embodiment of the Present Invention Referring to Figures 1 and 2 of the drawings, there is shown an acoustic panel 10 in the form of a sandwich structure, the acoustic panel 10 including a core structure 12, in this example of generally honeycomb-like N:\Perth\Cases\Patent\46000-46999\P4621 2AU2\Specis\P4621 2AU 2 Specification 2008-7-1 doc 4/07/08 00 -8- Sconfiguration, a first boundary member, in this example a first boundary sheet 14, attached to one side of the core structure 12 in any suitable way, for example using adhesive, and a second boundary member, in this example a second boundary sheet 16, fixed to an opposite side of the core structure 12 in any suitable way, for example using adhesive.
\O
IND
SThe first boundary sheet 14 is shown partially cut away in 00 Figure 1 for purposes of illustration.
C- i0 The first and second sheets 14,16 and the core structure 12 define a plurality of cells 17, each of which in this example has a generally hexagonal cross-sectional shape.
However, it will be understood that other cell shapes are possible, such as triangular, circular, and so on.
The first sheet 14 is provided with a plurality of apertures, in this example each cell 17 having one associated aperture 18, for facilitating transfer of sound into the cells 17.
In this example, the core structure 12 and the boundary sheets 14,16 are formed of aluminium material. However, it will be understood that any suitable material is envisaged, such as thermoplastics material or paper.
It will be understood that although in this example the apertures 18 are each shown disposed centrally of a cell 17, in practice this will generally not be the case.
Instead, the apertures 18 would generally be disposed at different locations relative to a respective cell 17.
It will also be understood that although in this example each cell has one associated aperture, any number of apertures may be provided.
In this example, each aperture 18 is formed so as to have a diameter which is less than or substantially equal to one millimetre, although it will be understood that a N:\Perth\Cases\Paont\46000-46999\P46212.AU.2\SpecisNP46212AU 2 Spedfication 2008-7-1 doc 4/07/08 00 plurality of apertures may be provided with the combined aperture area for at least some of the cells being less c- than or substantially equal to the area of an aperture of 1mm diameter.
The applicant has discovered unexpectedly that by forming C apertures which have a diameter which is less than or Ssubstantially equal to Imm, it is possible to increase the frequency range of sound absorption. The applicant has 00 also discovered that a preferred aperture diameter is within the range 0.3mm to 1mm and a preferred percentage open area is within the range 1% to 4%.
The sound absorption range and the sound absorption coefficient of the acoustic panel are also functions of the following attributes: i) the volume of each cell; ii) whether and to what degree the core structure 12 is perforated; and iii) the shear stiffness, surface mass, density and boundary conditions of the core structure 12.
In particular, by increasing the volume of each cell, for example by increasing the depth of each cell, the peak sound absorption coefficient can be shifted towards lower frequency levels. In this way, by providing apertures of diameter less than Imm and appropriately selecting the cell depth, a panel having a desired low frequency peak sound absorption coefficient and a relatively broad frequency range can be produced.
In addition to high sound absorption as a result of the microperforations, low frequency sound absorption may be further enhanced by utilising vibrations of the honeycomb core structure itself. By modifying characteristics such N:\Perth\Cases\Patent\46000-46999\P46212.AU.2\Specis\P46212.AU.2 Specification 2008-7-1.doc 4/07/08 00 10 00 Sas stiffness of the core structure, extra sound absorption can be achieved.
By selecting an appropriate average aperture diameter less than or equal to Imm and adjusting the above attributes, an acoustic panel having the desired sound absorption range and peak sound absorption coefficient can be NO constructed.
00 As an alternative, instead of providing each cell with one Sassociated aperture, at least some of the cells may be Cq i0 provided with two or more associated apertures, the area defined by the apertures associated with a cell being on average less than or substantially equal to the area of an aperture of Imm diameter.
A further alternative embodiment involves providing the first sheet 14 with apertures of varying sizes, preferably within the diameter range 0.3mm to Imm, and/or by providing the first sheet 14 with varying perforation densities and thereby varying percentage open areas.
Referring to Figure 3, there is shown a graph illustrating various plots of sound absorption coefficient versus frequency for various acoustic panels. In relation to the graph 20, it will be understood that refers to the depth of each cell 17, refers to the percentage open area, and"d"refers to the average diameter of the apertures.
A first plot 22 corresponds to sound absorption coefficients of an acoustic panel in accordance with the present invention with D 48mm, P 1.82% and d equals 0.8mm. A second plot 24 corresponds to an acoustic panel in accordance with the present invention with D 19mm, P 1.86% and d Imm. A third plot 26 corresponds to an acoustic panel in accordance with the present invention with D 19mm, P 1.4% and d 0.8mm. A fourth plot 28 corresponds to an acoustic panel in accordance with the NA Perth\Cases\Patent\46000-46999\P4621 2AU 2\SpeciskP46212 AU.2 Specification 2008-7-1 doc 4/07/08 00 -ii- O present invention with D 8.5mm, P 1.4% and d 0.6mm.
For reference purposes, a fifth plot 30 is also shown, the fifth plot 30 corresponding to a non-perforated honeycombtype panel with D 19mm, P 0% and d Omm.
s As can be seen in Figure 3, by varying the attributes D, P and d, the frequency corresponding to the peak sound INO absorption coefficient and the range of absorbed Sfrequencies can be modified.
00 As an alternative embodiment, a third boundary sheet and a C- io second core structure disposed between the second and third sheets may be provided. With this embodiment, the third sheet would be provided with apertures in a similar way to the first sheet.
In a further alternative embodiment, the cell volume of each cell is increased by providing multiple layers of core structures disposed in register or out of register with each other, the effect of which is to decrease the frequency for peak sound absorption.
Referring to Figures 4 and 5 of the drawings, there is shown an alternative embodiment of an acoustic panel 40 of the type including multiple layers of core structures.
Like features are indicated with like reference numerals.
The acoustic panel 40, as with the acoustic panel 10 shown in Figures 1 and 2, includes a first boundary sheet 14 provided with a plurality of apertures 18, and a second boundary sheet 16. Disposed between the first and second boundary sheets 14,16 are a first core structure 12 defining a plurality of first cells 17 and a second core structure 42 defining a plurality of second cells 44.
As can be seen in Figures 4 and 5, in this embodiment the first and second core structures 12,42 are disposed out of register with each other so that the cells defined by the first and second core structures 12,42 are interconnected.
N :\Perth\Cases\Patent\46000-46999\P45212AU 2\Specis\P46212.AU 2 Specification 2008-7-1.doc 4107/08 00 12 00 O The first and second core structures 12,14 may be fixed together using adhesive and may additionally include an intermediate sheet which is perforated. The intermediate sheet may take the form of a perforated adhesive layer or s may be formed of fibrous material.
It will be understood that this alternative arrangement ND enables all the air volume defined by the first and second Scells 17,44 to be utilised in order to provide sound 00 absorption at low frequencies and thereby effective use of the first and second cells 17,42 even if some of the apertures are blocked.
It will also be understood that this arrangement creates an air pump effect between neighboring cells so as to encourage extra air damping in the panel.
Furthermore, it will be understood that the intermediate sheet may be configured with any suitable pattern and has the effect of allowing relative motion of the intermediate sheet so as to maintain the low frequency structure strength and improve noise transmission loss at high frequency.
In order to construct an acoustic panel in accordance with the present invention, any suitable method may be used.
For example the boundary sheets may be fixed to the core structure using adhesive and the apertures may be formed by drilling perforation holes after fixing the first sheet 14 to the core structure 12.
Modifications and variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention.
N:\Perth\Cases\Patent\4600-46999\P46212AU 2\Specis\P46212.AU2 Specification 2008-7-l.doc 4107108
Claims (3)
- 2. An acoustic panel as claimed in claim 1, wherein the acoustic panel includes two or more first core structures fixed to each other so as to increase the effective volume of the cells.
- 3. An acoustic panel as claimed in claim 2, wherein the two or more first core structures are out of register with each other.
- 4. An acoustic panel as claimed in claim 2 or claim 3, further including an intermediate sheet disposed between adjacent core structures, the intermediate sheet being provided with a plurality of apertures. N:Perth\Cases\Patent\46000-4P4999\P6212 AU 2\Specis\P46212 AU.2 Specification 2008-7-l.doc 4/07/08 00 14 An acoustic panel substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings. I 00 N APerth\CaseskPatent 46OOO-46999kP4621 2 AU.2kSpeciskP46212.AU.2 Specification 2008-7-1 doc; 4/07108
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2008100620A AU2008100620A4 (en) | 2002-08-19 | 2008-07-04 | An acoustic panel and a method of manufacturing acoustic panels |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2002950852 | 2002-08-19 | ||
| AU2002950852A AU2002950852A0 (en) | 2002-08-19 | 2002-08-19 | An acoustic panel and a method of manufacturing acoustic panels |
| AU2003254381A AU2003254381A1 (en) | 2002-08-19 | 2003-08-19 | An acoustic panel and a method of manufacturing acoustic panels |
| AU2008100620A AU2008100620A4 (en) | 2002-08-19 | 2008-07-04 | An acoustic panel and a method of manufacturing acoustic panels |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2003254381A Division AU2003254381A1 (en) | 2002-08-19 | 2003-08-19 | An acoustic panel and a method of manufacturing acoustic panels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2008100620A4 true AU2008100620A4 (en) | 2008-08-07 |
Family
ID=27809937
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2002950852A Abandoned AU2002950852A0 (en) | 2002-08-19 | 2002-08-19 | An acoustic panel and a method of manufacturing acoustic panels |
| AU2003254381A Abandoned AU2003254381A1 (en) | 2002-08-19 | 2003-08-19 | An acoustic panel and a method of manufacturing acoustic panels |
| AU2008100620A Expired AU2008100620A4 (en) | 2002-08-19 | 2008-07-04 | An acoustic panel and a method of manufacturing acoustic panels |
| AU2010233057A Abandoned AU2010233057A1 (en) | 2002-08-19 | 2010-10-14 | An acoustic panel and a method of manufacturing acoustic panels |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2002950852A Abandoned AU2002950852A0 (en) | 2002-08-19 | 2002-08-19 | An acoustic panel and a method of manufacturing acoustic panels |
| AU2003254381A Abandoned AU2003254381A1 (en) | 2002-08-19 | 2003-08-19 | An acoustic panel and a method of manufacturing acoustic panels |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2010233057A Abandoned AU2010233057A1 (en) | 2002-08-19 | 2010-10-14 | An acoustic panel and a method of manufacturing acoustic panels |
Country Status (2)
| Country | Link |
|---|---|
| AU (4) | AU2002950852A0 (en) |
| WO (1) | WO2004016872A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007029751A1 (en) * | 2007-06-27 | 2009-01-02 | Architectural Research Corp., Livonia | Sound-absorbing room divider element |
| RU2010129455A (en) * | 2010-07-16 | 2012-01-27 | Общество с ограниченной ответственностью "Интер-Ремонт" (RU) | CELLULAR MATERIAL |
| CN107438881B (en) | 2015-04-10 | 2021-12-14 | Mra系统有限责任公司 | Acoustic liner and method of constructing an acoustic liner |
| DE102017205515B4 (en) * | 2017-03-31 | 2021-09-02 | BTU Cottbus-Senftenberg | Helmholtz resonator liner |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2458260A1 (en) * | 1974-12-10 | 1976-06-16 | Karlheinz Schulz | Compound panel for sound insulation in buildings - has offset honeycomb or corrugated layers of different thickness |
| CA1094605A (en) * | 1978-04-21 | 1981-01-27 | Seiichi Sahara | Panel member and process for manufacturing same |
| DE3411924C2 (en) * | 1984-03-30 | 1994-01-13 | Gruenzweig & Hartmann Montage | Tile element for vibration-resistant thermal insulation of walls, and use for the formation of a vibration-resistant thermal insulation lining of walls |
| US4630416A (en) * | 1985-05-09 | 1986-12-23 | Haworth, Inc. | Acoustical panel |
| US4886696A (en) * | 1988-05-10 | 1989-12-12 | Manville Corporation | Corrugated paperboard automotive liner |
| DE3913347A1 (en) * | 1989-04-22 | 1990-10-25 | Stocksmeier Uwe | Sound-insulating layer for flat surface - comprises regular hollow spaces enclosed by paper-strip walls |
| ATE189160T1 (en) * | 1992-08-03 | 2000-02-15 | Supracor Inc | PERFORATED HONEYCOMB BODY |
| US5653836A (en) * | 1995-07-28 | 1997-08-05 | Rohr, Inc. | Method of repairing sound attenuation structure used for aircraft applications |
| JPH1039875A (en) * | 1996-07-19 | 1998-02-13 | Mitsubishi Heavy Ind Ltd | Sound insulating material structure and soundproof structure of air conditioner |
| AU8504698A (en) * | 1997-07-22 | 1999-02-16 | Quantum International, Inc. | Insulation panels with internal radiant barrier |
| GB0016149D0 (en) * | 2000-06-30 | 2000-08-23 | Short Brothers Plc | A noise attenuation panel |
| DE20016051U1 (en) * | 2000-09-15 | 2002-02-21 | FAIST Automotive GmbH & Co. KG, 86381 Krumbach | Sound absorbing composite panel |
-
2002
- 2002-08-19 AU AU2002950852A patent/AU2002950852A0/en not_active Abandoned
-
2003
- 2003-08-19 AU AU2003254381A patent/AU2003254381A1/en not_active Abandoned
- 2003-08-19 WO PCT/AU2003/001052 patent/WO2004016872A1/en not_active Application Discontinuation
-
2008
- 2008-07-04 AU AU2008100620A patent/AU2008100620A4/en not_active Expired
-
2010
- 2010-10-14 AU AU2010233057A patent/AU2010233057A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU2003254381A1 (en) | 2004-03-03 |
| AU2010233057A1 (en) | 2010-11-04 |
| AU2002950852A0 (en) | 2002-09-12 |
| WO2004016872A1 (en) | 2004-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2405216C2 (en) | Layered structure having double order frequency-selective characteristic | |
| US5180619A (en) | Perforated honeycomb | |
| EP2491194B1 (en) | Acoustic panel | |
| US11686247B2 (en) | Acoustic panel for a nacelle of an aircraft propulsion unit, and related manufacturing methods | |
| US7631727B2 (en) | Sandwich structure with frequency-selective double wall behavior | |
| RU2593843C2 (en) | Corrugated acoustic panel and method of making | |
| US5633067A (en) | Engine compartment casing element with perforated foam layer | |
| US4294329A (en) | Double layer attenuation panel with two layers of linear type material | |
| US8752667B2 (en) | High bandwidth antiresonant membrane | |
| US4441578A (en) | Encapsulated bulk absorber acoustic treatments for aircraft engine application | |
| US4271219A (en) | Method of manufacturing an adhesive bonded acoustical attenuation structure and the resulting structure | |
| CN102300703B (en) | Honeycomb core structure for use in a structural panel for a jet engine nacelle | |
| US20090250293A1 (en) | Acoustically optimized cabin wall element | |
| JPS5947785B2 (en) | soundproofing elements | |
| CN102292210B (en) | Method for manufacturing structure with cellular cores for turbojet nacelle | |
| AU2008100620A4 (en) | An acoustic panel and a method of manufacturing acoustic panels | |
| CN106182940B (en) | A kind of sound absorption loading plate based on honeycomb sandwich structure | |
| WO2020107080A1 (en) | Acoustic absorption | |
| JP2007502748A (en) | Noise reduction components such as vehicle floor panels | |
| JP6482040B2 (en) | Sound absorbing panel using paper core material | |
| US20190392809A1 (en) | Micro-perforated wood veneer acoustic panel | |
| GB2059341A (en) | Double layer attenuation panel | |
| JP6379413B2 (en) | Sound absorption panel using core material and perforated board material | |
| JP2019191381A (en) | Sound absorption structure and sound absorption structure body | |
| JP7197862B2 (en) | How to adjust the sound absorbing structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AMFD | Amendment of filing date |
Effective date: 20080516 |
|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MAK | Offer to surrender letters patent | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |