KR20160056502A - Method for manufacturing acoustic absorbent and acoustic absorbing structure having the same - Google Patents
Method for manufacturing acoustic absorbent and acoustic absorbing structure having the same Download PDFInfo
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- KR20160056502A KR20160056502A KR1020140156453A KR20140156453A KR20160056502A KR 20160056502 A KR20160056502 A KR 20160056502A KR 1020140156453 A KR1020140156453 A KR 1020140156453A KR 20140156453 A KR20140156453 A KR 20140156453A KR 20160056502 A KR20160056502 A KR 20160056502A
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Abstract
A method of manufacturing a sound absorbing material according to an embodiment of the present invention includes: preparing a plate-shaped sound absorbing material having a predetermined width and length; And modifying the shape of the sound-absorbing material to produce a sound-absorbing material having a diameter and a length according to the frequency of the sound.
Description
Embodiments of the present invention relate to a sound absorbing material, and more particularly, to a method of manufacturing a sound absorbing material and a sound absorbing structure including the sound absorbing material.
The principle of noise reduction of a sound absorbing material is that the sound energy is converted into heat energy while the noise passes through the sound absorbing material, and fundamentally differs from that of the sound insulating material. If it is principle that the sound insulating material does not allow the noise to pass through in order to reduce the noise, the principle of the sound absorbing material is to reduce the noise while passing the noise between the sound absorbing materials.
Sound absorbing materials are widely used in various fields to reduce noise, but they may be exposed to heat and fire due to characteristics applied to electronic products and automobiles. These application characteristics should not cause harmful gases to the human body during combustion, among the conditions that the sound absorbing material should have.
However, since the conventional sound absorbing material is made of a material based on glass and synthetic fibers, it can contain a harmful component to the human body and can discharge a harmful gas to the human body even when it is burned. Also, in the case of a sound absorbing material having a high performance, the price is expensive to use.
A related prior art is Korean Patent Laid-Open Publication No. 10-2004-0063015 (entitled: Sound-absorbing panel, public date: July 14, 2004).
An embodiment of the present invention can manufacture a sound absorbing material having a simple structure at a low cost by manufacturing a sound absorbing material in a cylindrical shape having a helical structure by utilizing a sound absorbing material such as Korean paper, and can manufacture a sound absorbing material And a sound absorbing structure comprising the same.
One embodiment of the present invention provides a method of manufacturing a sound absorbing material and a sound absorbing structure including the sound absorbing material, wherein the distribution of the sound absorbing coefficient can be adjusted by adjusting the diameter, length, etc. of the sound absorbing material.
The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be clearly understood by those skilled in the art from the following description.
A method of manufacturing a sound absorbing material according to an embodiment of the present invention includes: preparing a plate-shaped sound absorbing material having a predetermined width and length; And modifying the shape of the sound-absorbing material to produce a sound-absorbing material having a diameter and a length according to the frequency of the sound.
The sound-absorbing material may be made of a paper material including Korean paper.
The step of manufacturing the sound absorbing material may include rolling the sound absorbing material to produce the sound absorbing material in a spiral cylindrical structure having a diameter and a length according to the frequency of the noise.
The method of manufacturing a sound absorbing material according to an embodiment of the present invention may further include adjusting the length of the sound absorbing material by cutting the sound absorbing material prior to the step of manufacturing the sound absorbing material.
The step of providing the sound-absorbing material may include the step of providing a plurality of sound-absorbing materials when the length of the sound-absorbing material is short to produce a sound-absorbing material having a desired diameter and length.
The method of manufacturing a sound absorbing material according to an embodiment of the present invention may further include the step of embossing the sound absorbing material to increase the sound absorbing area after the step of providing the sound absorbing material.
A sound absorbing structure according to an embodiment of the present invention includes a structure having a plurality of perforations formed therein; And a plurality of sound absorbing materials made of a plate-shaped sound absorbing material having a constant width and length and made of a material having a diameter and a length according to the frequency of the noise, and inserted in each of the perforations formed in the structure.
Wherein each of the plurality of perforations is a circular hole having different diameters and depths and each of the plurality of sound absorbing materials has a diameter and a length corresponding to a diameter and a depth of each of the plurality of perforations, Lt; / RTI >
The diameter of the sound absorbing material may be determined based on a design parameter including a first parameter for determining the thickness of the sound absorbing material and a second parameter for determining the length of the sound absorbing material.
The design parameter further includes a third parameter for determining a width of the sound absorbing material, and a length of the sound absorbing material may be determined based on the third parameter further included in the design parameter.
The details of other embodiments are included in the detailed description and the accompanying drawings.
According to one embodiment of the present invention, a sound absorbing material having a simple structure can be manufactured at a low cost by manufacturing a sound absorbing material in the form of a cylinder having a spiral structure by utilizing a sound absorbing material using paper such as Korean paper, and a sound absorbing effect have.
According to an embodiment of the present invention, the distribution of the sound absorption coefficient for each frequency can be adjusted by adjusting the diameter, length, etc. of the sound absorption material.
According to one embodiment of the present invention, since a sound-absorbing material such as hanji paper can be used to produce a sound-absorbing material, it is possible to diversify the selection range of the material. Since it does not contain harmful components like existing sound-absorbing materials, A harmless sound absorbing material can be provided.
1 and 2 are views illustrating a method of manufacturing a sound absorbing material according to an embodiment of the present invention.
FIG. 3 is a view illustrating a diameter and a length of a sound absorbing material according to an embodiment of the present invention. Referring to FIG.
FIG. 4 is a photograph of six specimens prepared to help understand the present invention. FIG.
FIG. 5 is a graph showing the results of comparison of sound absorption coefficients of six specimens manufactured as shown in FIG.
Fig. 6 is a graph showing the results of comparison between the sound absorption coefficient distribution and the Denaly-Bazley theoretical model for the length of the specimen.
7 is a graph showing a theoretical distribution of sound absorption coefficients according to flow resistance of existing sound absorbing materials.
FIG. 8 is a graph showing an experimental distribution of sound absorption coefficients according to production lengths of a new sound absorbing material made of Korean paper according to an embodiment of the present invention.
9 is a graph showing an experimental distribution of sound absorption coefficients according to lengths of new sound-absorbing materials made of A4 paper according to an embodiment of the present invention.
10 is a graph showing the results of comparing the absorption coefficient of the sound absorbing material of the present invention with that of the conventional sound absorbing material.
11 and 12 are views illustrating a sound absorbing structure according to an embodiment of the present invention.
FIG. 13 is a diagram showing an experimental result of a sound-absorbing structure according to an embodiment of the present invention.
Fig. 14 is a view for explaining the sound absorption theory model of the present invention.
15 is a schematic view of the sound absorption theory of the slit model of Fig.
16 is a view for explaining the sound wave propagation from the air layer to the sound absorbing material.
17 is a graph showing a result of comparing a sound absorption coefficient of a sound absorption material according to an embodiment of the present invention with a theoretical sound absorption coefficient through a slit model.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and / or features of the present invention, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 are views illustrating a method of manufacturing a sound absorbing material according to an embodiment of the present invention. In particular, FIG. 1 is a flowchart of a method of manufacturing a sound absorbing material according to an embodiment of the present invention, and FIG. 2 is a manufacturing process diagram of a method of manufacturing a sound absorbing material according to an embodiment of the present invention.
Referring to FIGS. 1 and 2, in
At this time, it may happen that the length of the sound-absorbing material is short to manufacture a sound-absorbing material having a desired diameter and length. In this case, a plurality of
Here, the
Next, in
At this time, the
That is, in the process of manufacturing the
In the present embodiment, the shape of the
Hereinafter, the diameter and length of the
3, the diameter S of the
That is, the diameter S of the
Accordingly, as the first parameter D for determining the thickness of the
As the second parameter L for determining the length of the
On the other hand, the length of the
That is, the length of the
Accordingly, as the third parameter W for determining the width of the
1 and 2, before the
Thus, the size of the
Further, after the
As described above, in one embodiment of the present invention, a sound absorbing material having a simple structure can be manufactured at a low cost by manufacturing a sound absorbing material in a cylindrical shape having a helical structure utilizing a sound absorbing material such as Korean paper, and a sound absorbing effect can be easily obtained, .
FIG. 4 is a photograph of six specimens prepared to help understand the present invention. FIG.
Referring to FIG. 4, six specimens are cylindrical, 29 mm in diameter, and 20 mm in height. All six specimens are the same. As a sound absorbing material, one of the materials which can be easily obtained from around is selected. The difference between the six samples is only the difference in the length of the sound absorbing material used for each sample (see Table 1 below).
FIG. 5 is a graph showing the results of comparison of sound absorption coefficients of six specimens manufactured as shown in FIG.
As shown in FIG. 5, as a result of comparing the sound absorption coefficients of the six specimens, the distribution of the sound absorption coefficient by frequency varies depending on the length of the specimen. These results indicate that the flow resistivity It is found that the distribution of sound absorption coefficient by frequency is very similar to that of sound absorption coefficient.
Assuming that the diameters of the fabricated specimens are the same, the length of the specimen is a variable for setting the frequency at which the absorbent material of the present invention is absorbed, and it is possible to set the absorption rate for a desired frequency by changing only the fabricated length.
Fig. 6 is a graph showing the results of comparison between the sound absorption coefficient distribution and the Denaly-Bazley theoretical model for the length of the specimen.
Referring to FIG. 6, two parameters for determining the distribution of the absorption coefficient of the conventional sound absorbing material are the thickness of the sample and the flow resistance.
As shown in FIG. 6, it can be seen that the distribution of the absorption coefficient of the existing sound-absorbing material and the distribution of the sound-absorbing coefficient of the new sound-absorbing material proposed by the present invention tend to be very similar, and the low frequency sound absorption rate of the new sound- It can be seen that it represents a numerical value.
In addition, the distribution of the flow resistance of the conventional sound absorbing material and the transition of the sound absorption coefficient according to the distribution of the length of the new sound absorbing material are very similar, and this can be a basis for determining that the length of the new sound absorbing material is a factor determining the flow resistance have.
FIG. 7 is a graph showing a theoretical distribution of sound absorption coefficients according to flow resistance of existing sound absorbing materials, FIG. 8 is a graph showing experimental distribution of sound absorption coefficients according to production lengths of new sound absorbing materials made of Korean paper according to an embodiment of the present invention, 9 is a graph showing an experimental distribution of sound absorption coefficients according to production lengths of a new sound absorbing material made of A4 paper according to an embodiment of the present invention.
When comparing FIG. 7 with FIGS. 8 and 9, it can be seen that the red color showing a high sound absorption rate in the new sound absorbing material is higher at the low frequency.
As a result, it can be seen that the new sound absorbing material presented in the present invention exhibits a sound absorption coefficient similar to that of conventional sound absorbing materials, but exhibits a better sound absorbing ratio than the same thickness.
10 is a graph showing the results of comparing the absorption coefficient of the sound absorbing material of the present invention with that of the conventional sound absorbing material.
As shown in FIG. 10, the sound absorption coefficient of the sound absorbing material of the present invention is superior to that of the conventional sound absorbing material.
11 and 12 are views illustrating a sound absorbing structure according to an embodiment of the present invention.
11 and 12, a sound absorbing structure according to an embodiment of the present invention includes a
A plurality of
The plurality of
The sound-absorbing
FIG. 13 is a diagram showing an experimental result of a sound-absorbing structure according to an embodiment of the present invention.
Referring to FIG. 13, as a result of actual experiments, the distribution of the sound absorption coefficient is different according to the length of the sound absorbing material, which indicates that the frequency tuning according to the length of the manufacture is possible. Therefore, the additional absorption coefficient increase effect can be obtained by arranging various specimens having different lengths in parallel in parallel and in series.
A conventional sound absorbing material may contain harmless components to the human body, and there is a disadvantage that the unit price may be increased according to the manufacturing method. However, the present invention can manufacture a sound-absorbing material which is harmless to the human body and at the same time, it can be manufactured at a lower cost compared to existing sound-absorbing materials, and a sound-absorbing material having the same or better sound- .
Fig. 14 is a view for explaining the sound absorption theory model of the present invention.
Referring to FIG. 14, there is a slit-type model in the sound absorption theory of the sound absorbing material (left drawing). The sound absorption structure of the slit type is absorbed by the viscosity effect and the thermal effect, and the sound absorption coefficient and the impedance can be adjusted by controlling the air layer volume between the rigid walls.
In the present invention, a layered absorber is constituted by a spiral shape (right drawing) which is easy to manufacture in a conventional slit shape having a structure for stacking layers in parallel.
15 is a schematic view of the sound absorption theory of the slit model of Fig.
Fig. 15 illustrates the principle of sound absorption of a slit model. As a result of the viscosity of the air, the sound velocity is zero in the rigid wall.
The theory of the effective density that has an effect on the viscosity in the slit model is shown in
The theory of the bulk modulus with the effect of thermal energy conversion in the slit model is shown in
The effective density and the bulk modulus according to the sound propagation in the slit model can be obtained according to the above equations (4) and (5). If the obtained result is simplified, it can be expressed by Equation (6) below.
Knowing the simplified effective density and bulk modulus, the characteristic impedance for a structure having a slit model shape can be obtained, and the acoustic impedance and the reflection coefficient can be obtained through the characteristic impedance.
The theoretical sound absorption coefficient of the sound absorption material to be ultimately obtained through the reflection coefficient can be obtained.
Hereinafter, a process of theoretically determining the characteristic impedance and the number of sound-absorbing materials of the sound-absorbing material will be described with reference to FIG. 16 and Equations (7) and (8).
16 is a view for explaining the sound wave propagation from the air layer to the sound absorbing material. The characteristic impedance of the sound absorbing material and the sound absorption coefficient can be theoretically obtained through the development process of FIG. 16 and Equations (7) and (8).
17 is a graph showing a result of comparing a sound absorption coefficient of a sound absorption material according to an embodiment of the present invention with a theoretical sound absorption coefficient through a slit model.
Referring to FIG. 17, the absorption coefficient of the slit model is obtained based on the theoretical development as described above, and the experimental absorption coefficients of the sound absorption materials presented in the present invention are compared.
Further, it can be seen that the absorption coefficient is slightly higher than the theoretical value. Therefore, it can be confirmed that the sound absorbing material proposed in the present invention closely follows the characteristics of the slit model.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.
210: Sound absorbing material
220, 1220: sound absorbing material
1110: Structure
1120: Perforation
Claims (10)
A step of modifying the shape of the sound-absorbing material to produce a sound-absorbing material having a diameter and a length according to the frequency of the sound
Wherein the sound absorbing material is formed of a metal.
The sound-
Wherein the sound absorbing material is formed of a paper material including a paper.
The step of manufacturing the sound absorbing material
Rolling the sound-absorbing material to produce the sound-absorbing material in a spiral cylindrical structure having a diameter and a length according to the frequency of the noise
Wherein the sound absorbing material is formed of a metal.
Adjusting the length of the sound absorbing material by cutting the sound absorbing material before the step of manufacturing the sound absorbing material
Further comprising the steps of:
The step of providing the sound absorbing material
If the length of the sound-absorbing material is short for producing a sound-absorbing material having a desired diameter and length, the step of preparing a plurality of sound-
Wherein the sound absorbing material is formed of a metal.
After the step of providing the sound-absorbing material, the step of embossing the sound-absorbing material to increase the sound-absorbing area
Further comprising the steps of:
A plurality of sound absorbing members made of a plate-shaped sound absorbing material having a constant width and a length and made to have a diameter and a length according to the frequency of the noise,
Wherein the sound absorbing structure comprises:
Each of the plurality of apertures
Are circular holes having different diameters and depths,
Each of the plurality of sound absorbing materials
Wherein the sound absorbing structure has a diameter and a length corresponding to the diameter and the depth of each of the plurality of perforations so that the distribution of the sound absorption coefficient by frequency can be adjusted.
The diameter of the sound absorbing material
A first parameter for determining the thickness of the sound absorbing material, and a second parameter for determining the length of the sound absorbing material.
The design variables
Further comprising a third parameter for determining a width of the sound absorbing material,
The length of the sound absorbing material
And is determined based on the third parameter further included in the design parameter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180097975A (en) * | 2017-02-24 | 2018-09-03 | 한양대학교 산학협력단 | Device for reducing broadband noise of sound |
| WO2021096683A1 (en) * | 2019-11-11 | 2021-05-20 | Toyota Motor Engineering & Manufacturing North America, Inc. | Degenerative sound isolation device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220061560A (en) | 2020-11-06 | 2022-05-13 | 현대자동차주식회사 | Light and thin sound-absorbing material, and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01173212U (en) * | 1988-05-26 | 1989-12-08 | ||
| JP2005023619A (en) * | 2003-07-01 | 2005-01-27 | Nakanishi Metal Works Co Ltd | Sound absorbing panel and sound absorber |
| JP2006138927A (en) * | 2004-11-10 | 2006-06-01 | Shikoku Tohcello Co Ltd | Acoustic material, sound absorbing material, sound absorbing duct, and acoustic apparatus |
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2014
- 2014-11-11 KR KR1020140156453A patent/KR101643689B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01173212U (en) * | 1988-05-26 | 1989-12-08 | ||
| JP2005023619A (en) * | 2003-07-01 | 2005-01-27 | Nakanishi Metal Works Co Ltd | Sound absorbing panel and sound absorber |
| JP2006138927A (en) * | 2004-11-10 | 2006-06-01 | Shikoku Tohcello Co Ltd | Acoustic material, sound absorbing material, sound absorbing duct, and acoustic apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180097975A (en) * | 2017-02-24 | 2018-09-03 | 한양대학교 산학협력단 | Device for reducing broadband noise of sound |
| WO2021096683A1 (en) * | 2019-11-11 | 2021-05-20 | Toyota Motor Engineering & Manufacturing North America, Inc. | Degenerative sound isolation device |
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| KR101643689B1 (en) | 2016-07-29 |
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