CN119408246A - Perforated foamed aluminum composite sound absorbing plate and preparation method thereof - Google Patents
Perforated foamed aluminum composite sound absorbing plate and preparation method thereof Download PDFInfo
- Publication number
- CN119408246A CN119408246A CN202411540736.8A CN202411540736A CN119408246A CN 119408246 A CN119408246 A CN 119408246A CN 202411540736 A CN202411540736 A CN 202411540736A CN 119408246 A CN119408246 A CN 119408246A
- Authority
- CN
- China
- Prior art keywords
- perforated
- foam aluminum
- aluminum plate
- holes
- foam
- 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.)
- Pending
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 198
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 197
- 239000002131 composite material Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000006260 foam Substances 0.000 claims abstract description 78
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 31
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- 239000011148 porous material Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000004080 punching Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 73
- 239000000463 material Substances 0.000 abstract description 31
- 230000000694 effects Effects 0.000 abstract description 27
- 230000009467 reduction Effects 0.000 abstract description 11
- 239000011358 absorbing material Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 14
- 238000005520 cutting process Methods 0.000 description 7
- 238000004026 adhesive bonding Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
本发明提供一种打孔泡沫铝复合吸音板及其制备方法，打孔泡沫铝复合吸音板包括层叠设置的泡沫铝板、无纺布和穿孔铝板，泡沫铝板的材料为闭孔泡沫铝，泡沫铝板上设有多个沿厚度方向贯穿的第一通孔，各第一通孔在泡沫铝板上均匀分布，穿孔铝板上设有多个第二通孔，各第二通孔在穿孔铝板上均匀分布，无纺布上涂覆有胶粘剂，泡沫铝板和穿孔铝板通过无纺布粘接结合。本发明将闭孔泡沫铝板进行打孔，使材料部分孔洞连通，产生粘滞效应，可以整体提高材料的吸音性能，并将穿孔铝板与泡沫铝板复合，通过多介质的吸声材料叠加，可以减少不同频段吸声系数的差值，在更宽的频率范围内取得良好的吸声效果，提高降噪系数。
The present invention provides a perforated foam aluminum composite sound-absorbing board and a preparation method thereof. The perforated foam aluminum composite sound-absorbing board comprises a foam aluminum board, a non-woven fabric and a perforated aluminum board arranged in layers. The material of the foam aluminum board is closed-cell foam aluminum. The foam aluminum board is provided with a plurality of first through holes penetrating in the thickness direction, and each first through hole is evenly distributed on the foam aluminum board. The perforated aluminum board is provided with a plurality of second through holes, and each second through hole is evenly distributed on the perforated aluminum board. The non-woven fabric is coated with an adhesive, and the foam aluminum board and the perforated aluminum board are bonded and combined by the non-woven fabric. The present invention punches holes in the closed-cell foam aluminum board to connect some holes of the material, thereby generating a viscous effect, which can improve the sound absorption performance of the material as a whole, and composites the perforated aluminum board with the foam aluminum board. By superimposing multi-medium sound-absorbing materials, the difference in sound absorption coefficients of different frequency bands can be reduced, and a good sound absorption effect can be achieved in a wider frequency range, thereby improving the noise reduction coefficient.
Description
Technical Field
The invention relates to the technical field of sound absorbing materials, in particular to a perforated foamed aluminum composite sound absorbing plate and a preparation method thereof.
Background
Foamed aluminum is an excellent sound absorbing material and has remarkable middle-low frequency sound absorbing capability. is in accordance with the environmental protection requirement compared with the traditional sound absorption material, has the advantages of light weight, durability and the like, and has good application prospect in the fields of buildings, vehicles and the like.
However, researches show that the foamed aluminum has larger sound absorption effect on sounds with different frequencies, the sound absorption peak value generally appears at 750-1000 Hz, the sound absorption coefficient peak value can reach about 0.8, the sound absorption coefficient can be obviously reduced within the frequency ranges of 250-500 Hz and 1250-2500 Hz, and the overall noise reduction coefficient is about 0.5. The prior art indicates that the sound absorption performance can be improved by adjusting the porosity of the foamed aluminum, and the noise reduction coefficient of the material can be improved in the mode, but the sound absorption capability in each frequency band still has larger difference, and the low-frequency sound absorption effect and the high-frequency sound absorption effect cannot be simultaneously achieved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problems of improving the low-frequency and high-frequency sound absorption effects of the foamed aluminum material, reducing the difference value of the sound absorption coefficients of each frequency band and improving the noise reduction coefficient.
In order to solve the problems, the invention provides a perforated aluminum foam composite sound absorbing plate, which comprises a foamed aluminum plate, a non-woven fabric and a perforated aluminum plate which are arranged in a laminated mode, wherein the foamed aluminum plate is made of closed-pore foamed aluminum, a plurality of first through holes penetrating in the thickness direction are formed in the foamed aluminum plate, the first through holes are uniformly distributed on the foamed aluminum plate, a plurality of second through holes are formed in the perforated aluminum plate, the second through holes are uniformly distributed on the perforated aluminum plate, an adhesive is coated on the non-woven fabric, and the foamed aluminum plate and the perforated aluminum plate are bonded through the non-woven fabric.
The invention punches the closed-pore foamed aluminum plate to ensure that the holes of the material are communicated to generate a viscous effect, so that the sound absorption performance of the material can be integrally improved, the perforated aluminum plate and the foamed aluminum plate are compounded, the difference value of sound absorption coefficients of different frequency bands can be reduced by superposing the sound absorption materials with multiple media, a good sound absorption effect is obtained in a wider frequency range, the noise reduction coefficient is improved, the foamed aluminum plate and the perforated aluminum plate are bonded and combined through non-woven fabrics, the adhesive is prevented from entering the holes of the foamed aluminum plate and the perforated aluminum plate, and the sound absorption effect is ensured.
Further, the first through holes and the second through holes are arranged in a staggered manner. Namely, the positions of the first through holes and the second through holes are completely staggered, no superposition occurs, the sound waves are ensured to be reflected and absorbed for multiple times in the composite sound absorbing plate, the transmission path of the sound waves is increased, and therefore the sound absorbing effect is enhanced.
Further, the aperture ratio of the foamed aluminum plate is 1% -10%. With the increase of the aperture ratio, the sound absorption peak value is shifted to a high frequency, and the difference value of the sound absorption coefficients of the frequency bands is reduced, but the increase of the aperture ratio can reduce the sound absorption coefficient peak value, and the excessive increase of the aperture ratio can reduce the noise reduction coefficient of the material, so that the aperture ratio needs to be limited in a proper range.
Further, each first through hole is arranged in a square array or a regular triangle array. The first through holes are regularly arranged, so that the sound absorption performance of each part of the material is consistent.
Further, the first through holes are round holes, the aperture of each first through hole is 0.1-1 mm, and the distance between adjacent holes is 10-100 mm. The first through hole is a round hole with a small aperture, which is favorable for widening the coverage range of sound absorption frequency, but the noise reduction coefficient is obviously reduced when the aperture is too small.
Further, the aperture ratio of the perforated aluminum plate is 10% -30%.
Further, the second through holes are round holes, the aperture of each second through hole is 1-5 mm, and the distance between adjacent holes is 1-5 mm.
In the limited aperture ratio and aperture range, the perforated aluminum plate has good sound absorption effect on low-frequency and high-frequency sound waves, and after the perforated aluminum plate and the perforated foamed aluminum plate are compounded, the sound absorption effect is overlapped, so that the perforated aluminum plate has good sound absorption performance in the whole frequency range of 200-4000 Hz.
Further, the porosity of the closed-cell aluminum foam is 70% -80%, and the pore diameter of the closed-cell aluminum foam is 2-5 mm. The porosity and pore diameter of the closed-cell foam aluminum can influence the sound absorption performance, and the proper porosity and pore diameter can increase the diffuse reflection and viscous effect of the surface, so that the sound absorption performance is improved.
Further, the thickness of the foamed aluminum plate is 10-30 mm, and the thickness of the perforated aluminum plate is 1-8 mm. The composite acoustic panel has the advantages of thinner overall thickness, limited improvement of noise reduction coefficient due to increased thickness, light weight and low cost.
The invention also provides a preparation method of the perforated foamed aluminum composite acoustic panel, which comprises the following steps:
preparing closed-cell aluminum foam, cutting the closed-cell aluminum foam into aluminum foam plates with designed sizes, and forming a plurality of first through holes penetrating in the thickness direction on the aluminum foam plates by adopting a laser drilling or punching method;
Preparing non-woven fabrics, cutting the non-woven fabrics into the same size as the foamed aluminum plate, and brushing adhesive on the non-woven fabrics;
And preparing a perforated aluminum plate, cutting the perforated aluminum plate into the same size as the perforated aluminum plate, respectively arranging the perforated aluminum plate and the perforated aluminum plate on two sides of the non-woven fabric, and pressurizing to realize gluing to obtain the perforated foamed aluminum composite sound absorbing plate.
The preparation method adopts the non-woven fabric as the bonding layer, bonds the foamed aluminum plate and the perforated aluminum plate together, avoids the adhesive from entering through holes or foam aluminum holes, reduces the adverse effect of the composite technology on the sound absorption performance of the material, realizes the superposition of the multi-medium sound absorption effect, and has simple operation, the material bonding can be realized by slightly pressurizing without heating and curing.
In summary, the invention has the following beneficial effects:
(1) According to the invention, the perforated foamed aluminum plate and the perforated aluminum plate are compounded, so that the sound absorption effects of the two sound absorption materials are overlapped, the coverage range of the sound absorption frequency of the materials is widened, the difference value of the sound absorption coefficients of each frequency band is reduced, and the noise reduction coefficient is improved.
(2) According to the invention, the first through holes on the foamed aluminum plate and the second through holes on the perforated aluminum plate are arranged in a staggered manner, so that the transmission path of sound waves in the composite sound-absorbing plate is prolonged, and the sound-absorbing effect is enhanced.
(3) According to the invention, the structures of the foam aluminum plate cells, the first through holes and the second through holes of the perforated aluminum plate are limited, so that the structure with the optimal sound absorption effect is obtained, the composite sound absorption plate is provided with a plurality of sound absorption peaks, the peak width is increased, and the sound absorption effect is good in the whole frequency range of 200-4000 Hz.
(4) The invention adopts the non-woven fabrics to bond the foamed aluminum plate and the perforated aluminum plate together, avoids the adverse effect of blocking holes by adhesive on the sound absorption performance of the material, simplifies the process operation and is beneficial to industrial popularization.
Drawings
Fig. 1 is a schematic structural view of a perforated aluminum foam composite sound absorbing panel in accordance with an embodiment of the present invention.
Fig. 2 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 1 of the present invention.
Fig. 3 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 2 of the present invention.
Fig. 4 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 3 of the present invention.
Fig. 5 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 4 of the present invention.
Fig. 6 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 5 of the present invention.
Fig. 7 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 6 of the present invention.
Fig. 8 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 7 of the present invention.
Fig. 9 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 8 of the present invention.
Fig. 10 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of example 9 of the present invention.
Fig. 11 is a graph of sound absorption coefficient versus frequency for a closed cell foam aluminum panel of comparative example 1 of the present invention.
Fig. 12 is a graph of sound absorption coefficient versus frequency for a perforated foamed aluminum sheet of comparative example 2 of the present invention.
Fig. 13 is a graph of sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of comparative example 3 of the present invention.
FIG. 14 is a graph showing sound absorption coefficient versus frequency for the perforated aluminum foam composite sound absorbing panel of comparative example 4 of the present invention
Reference numerals illustrate:
1-foam aluminum plate, 2-non-woven fabrics, 3-perforated aluminum plate, 4-first through holes and 5-second through holes.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the application described herein without departing from the scope or spirit of the application. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present application. The specification and examples of the present application are exemplary only.
The embodiment of the invention provides a perforated foamed aluminum composite sound absorbing plate, the typical structure of which is shown in fig. 1, comprising foamed aluminum plates 1, non-woven fabrics 2 and perforated aluminum plates 3 which are arranged in a laminated manner. Wherein the thickness of the foamed aluminum plate 1 is 10-30 mm, the material is closed-cell foamed aluminum, the preferable porosity is 70% -80%, and the pore diameter of the foam holes is 2-5 mm. The foam aluminum plate 1 is uniformly provided with a plurality of first through holes 4 penetrating in the thickness direction, so that holes of the closed-cell foam aluminum part are communicated to generate a viscous effect, the first through holes 4 are distributed in a square array or a regular triangle array to ensure the consistency of sound absorption performance of all parts of the material, preferably, the aperture ratio of the foam aluminum plate 1 is 1% -10%, the first through holes 4 are circular holes, the aperture is 0.1-1 mm, and the distance between adjacent holes is 10-100 mm. The thickness of the perforated aluminum plate 3 is 1-8 mm, and a plurality of second through holes 5 which are uniformly distributed are formed in the perforated aluminum plate. Preferably, the aperture ratio of the perforated aluminum plate 3 is 10% -30%, the second through holes 5 are round holes, the aperture is 1-5 mm, and the distance between adjacent holes is 1-5 mm. The non-woven fabric 2 is used as an adhesive layer, and is coated with an adhesive, the foamed aluminum plate 1 and the perforated aluminum plate 3 are arranged on two sides of the non-woven fabric 2 and are bonded and combined through the non-woven fabric 2. The foam aluminum plate 1 has good sound absorption effect on medium-frequency sound waves, the perforated aluminum plate 3 has better sound absorption effect on low frequency and high frequency, and after the foam aluminum plate 1 and the perforated aluminum plate 3 are compounded, the sound absorption effect is overlapped, the coverage range of the sound absorption frequency of the material is widened, the difference value of the sound absorption coefficients of each frequency band is reduced, and the noise reduction coefficient is improved. Preferably, the first through holes 4 on the foamed aluminum plate 1 and the second through holes 5 on the perforated aluminum plate 3 are arranged in a staggered manner, so that the sound waves can be reflected and absorbed for multiple times on the composite sound absorbing plate, the transmission path of the sound waves is prolonged, and the sound absorbing effect is enhanced.
The preparation process flow of the perforated foamed aluminum composite acoustic panel is as follows:
(1) A closed-cell aluminum foam is prepared, cut into an aluminum foam sheet 1 of a designed size, and a plurality of first through holes 4 penetrating in the thickness direction are formed in the aluminum foam sheet by a laser drilling or punching method.
(2) A nonwoven fabric 2 was prepared, cut to the same size as the foamed aluminum plate, and an adhesive was applied to the nonwoven fabric 2.
(3) And preparing a perforated aluminum plate 3, cutting the perforated aluminum plate into the same size as the foamed aluminum plate, respectively arranging the foamed aluminum plate 1 and the perforated aluminum plate 3 on two sides of the non-woven fabric 2, and pressurizing to realize gluing to obtain the perforated foamed aluminum composite sound-absorbing plate.
The preparation method adopts the non-woven fabric as the bonding layer, avoids the adhesive from entering through holes or foam aluminum cells, reduces the adverse effect of the composite technology on the sound absorption performance of the material, has simple operation, can realize the material bonding by slightly pressurizing, and is convenient for industrial production.
The technical effects of the present invention will be described below with reference to specific examples.
Example 1
The preparation method comprises the following steps of preparing a perforated foamed aluminum composite sound absorbing plate, namely preparing closed-pore foamed aluminum with the porosity of 75% and the average pore diameter of 4mm, cutting into foamed aluminum plates with the thickness of 20mm and the length and width of 100X 100mm, and forming a plurality of through holes penetrating through the foamed aluminum plates in the thickness direction in a laser perforation mode, wherein the open porosity is 5%, the through holes are distributed in a square array, the pore diameter is 0.5mm, and the distance between adjacent holes is 50mm. A perforated aluminum plate having a thickness of 2mm was prepared, and a sample having a length and width of 100×100mm was cut, the aperture ratio of the perforated aluminum plate was 25%, the aperture diameter of the through hole was 2mm, and the distance between adjacent holes was 3mm. Cutting a piece of non-woven fabric with the thickness of 100mm by 100mm, brushing an adhesive, respectively arranging a foamed aluminum plate and a perforated aluminum plate on two sides of the non-woven fabric, arranging through holes on the foamed aluminum plate and the through holes on the perforated aluminum plate in a staggered manner, and pressurizing to realize gluing to obtain the perforated foamed aluminum composite sound-absorbing plate.
The samples of this example were tested for their sound absorption coefficients at different frequencies and the Noise Reduction Coefficient (NRC) was 0.82 as shown in fig. 2.
Example 2
A perforated foamed aluminum composite sound absorbing panel was prepared, and this example was different from example 1 in that the foamed aluminum panel had an open porosity of 10% and an adjacent hole spacing of 10mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficients at different frequencies and the result is shown in fig. 3 with an NRC of 0.77.
Example 3
The perforated foamed aluminum composite sound absorbing plate was prepared, and the difference between the embodiment and the embodiment 1 is that the foamed aluminum plate has an opening ratio of 3%, the through holes are arranged in a regular triangle array, the aperture is 1mm, and the distance between adjacent holes is 30mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficients at different frequencies and the NRC was 0.79 as shown in fig. 4.
Example 4
A perforated foamed aluminum composite sound absorbing plate was prepared, and this example was different from example 1 in that the perforated aluminum plate had an opening ratio of 30%, the hole diameter of the through holes was 1mm, and the distance between adjacent holes was 2mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficients at different frequencies and the NRC was 0.79 as shown in fig. 5.
Example 5
A perforated foamed aluminum composite sound absorbing panel was produced, and this example was different from example 1 in that the foamed aluminum panel had a porosity of 80% and a cell pore diameter of 3mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficients at different frequencies and the NRC was 0.75 as shown in fig. 6.
Example 6
A perforated aluminum foam composite sound absorbing panel was prepared, and this example was different from example 1 in that the thickness of the aluminum foam panel was 30mm and the thickness of the perforated aluminum panel was 5mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficient at different frequencies and the NRC was 0.81 as shown in fig. 7.
Example 7
The perforated foamed aluminum composite sound absorbing plate was prepared, and this example was different from example 1 in that the foamed aluminum plate had a thickness of 30mm, an opening ratio of 1%, a through hole diameter of 0.2mm and an adjacent hole pitch of 100mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficients at different frequencies and the NRC was 0.72 as shown in fig. 8.
Example 8
A perforated foamed aluminum composite sound absorbing panel was prepared, and this example was different from example 1 in that the perforated aluminum plate had a thickness of 5mm, an opening ratio of 15%, and an adjacent hole spacing of 5mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficient at different frequencies and the result is shown in fig. 9 with an NRC of 0.81.
Example 9
The perforated foamed aluminum composite sound absorbing plate was prepared, and this example was different from example 1 in that the foamed aluminum plate had an opening ratio of 7%, a through hole diameter of 0.8mm, an adjacent hole spacing of 20mm, an opening ratio of 20% and a through hole diameter of 3mm, and an adjacent hole spacing of 5mm. Other material characteristics and process steps are the same.
The samples of this example were tested for their sound absorption coefficients at different frequencies and the NRC was 0.78 as shown in fig. 10.
Comparative example 1
A closed cell foamed aluminum plate was prepared, and a closed cell foamed aluminum plate having a porosity of 75% and an average cell pore diameter of 4mm was cut into a plate having a thickness of 20mm and a length and width of 100X 100 mm.
The samples of this comparative example were tested for sound absorption coefficient at different frequencies and the result is shown in fig. 11 with NRC of 0.31.
Comparative example 2
Preparing a perforated foamed aluminum plate, preparing closed-cell foamed aluminum with the porosity of 75% and the average cell pore diameter of 4mm, cutting into foamed aluminum plates with the thickness of 20mm and the length and width of 100X 100mm, and forming a plurality of through holes penetrating in the thickness direction on the foamed aluminum plate in a laser perforation mode, wherein the open porosity is 5%, the through holes are distributed in a square array, the pore diameter is 0.5mm, and the distance between adjacent holes is 50mm.
The samples of this comparative example were tested for their sound absorption coefficient at different frequencies and the result is shown in fig. 12 with an NRC of 0.38.
Comparative example 3
A perforated aluminum foam composite sound absorbing panel was prepared, and this comparative example was different from example 1 in that, when the aluminum foam sheet and the perforated aluminum sheet were bonded by nonwoven fabric, the through holes in the aluminum foam sheet were aligned with the through holes in the perforated aluminum sheet, and the through holes in the aluminum foam sheet were all covered with the through holes in the perforated aluminum sheet. Other material characteristics and process steps are the same.
The samples of this comparative example were tested for sound absorption coefficient at different frequencies and the result is shown in fig. 13 with NRC of 0.61.
Comparative example 4
A perforated aluminum foam composite sound absorbing panel was prepared, and this comparative example was different from example 3 in that an aluminum foam panel and a perforated aluminum panel were bonded by a liquid adhesive. Other material characteristics and process steps are the same.
The samples of this comparative example were tested for sound absorption coefficient at different frequencies and the result is shown in fig. 14 with an NRC of 0.70.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411540736.8A CN119408246A (en) | 2024-10-31 | 2024-10-31 | Perforated foamed aluminum composite sound absorbing plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411540736.8A CN119408246A (en) | 2024-10-31 | 2024-10-31 | Perforated foamed aluminum composite sound absorbing plate and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119408246A true CN119408246A (en) | 2025-02-11 |
Family
ID=94463054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411540736.8A Pending CN119408246A (en) | 2024-10-31 | 2024-10-31 | Perforated foamed aluminum composite sound absorbing plate and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119408246A (en) |
-
2024
- 2024-10-31 CN CN202411540736.8A patent/CN119408246A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4379191A (en) | Honeycomb noise attenuation structure | |
| US4384020A (en) | Honeycomb noise attenuating structures | |
| US4300978A (en) | Bonding tool for venting honeycomb noise attenuation structure during manufacture | |
| US4421811A (en) | Method of manufacturing double layer attenuation panel with two layers of linear type material | |
| US4318453A (en) | Double layer attenuation panel | |
| US20130020148A1 (en) | Partition panel | |
| JP2005163787A (en) | Soundproof panel with beads and manufacturing method thereof | |
| JP2011519433A (en) | Composite sound absorbing sheet | |
| US9073622B2 (en) | Intermediate acoustic skin and the implementation thereof | |
| KR101846574B1 (en) | Composite sound absorbing materials for automobile and manufacture method of the same | |
| CN106639015A (en) | Composite noise-reduction muffler plate | |
| CN102543061A (en) | Wide band sound absorption structure of film mechanical impedance combined with micropunched plate acoustic impedance | |
| CN110473513B (en) | Micro-slit metamaterial acoustic sandwich plate | |
| CN108831431B (en) | Full-frequency diffusion noise elimination device and ventilation channel noise elimination system | |
| CN114030247B (en) | A sound-absorbing and insulating lightweight composite panel based on acoustic black holes | |
| CN206460780U (en) | Plus the multilayer open celled foam aluminium sheet sound absorption structure of cavity | |
| CN116312437A (en) | Low-frequency broadband sound absorption and noise reduction structure | |
| CN119408246A (en) | Perforated foamed aluminum composite sound absorbing plate and preparation method thereof | |
| CN109322416A (en) | A kind of bulkhead sound-insulating and heat-insulating composite construction | |
| CN203258770U (en) | Sound insulation cotton for air conditioner compressor and air conditioner | |
| WO2019004153A1 (en) | Soundproof covering material and engine unit | |
| JP2000112482A (en) | Sound absorbing sheet and sound absorbing sheet laminate | |
| CN110783084A (en) | A broadband composite resonance sound absorption and isolation structure | |
| CN210508031U (en) | Sound-absorbing light partition | |
| CN113799449B (en) | Composite damping plate for medium-low frequency noise reduction switching |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication |