CN220821083U - Metamaterial sound-absorbing board with sound wave opposite-impact function - Google Patents
Metamaterial sound-absorbing board with sound wave opposite-impact function Download PDFInfo
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- CN220821083U CN220821083U CN202322257897.3U CN202322257897U CN220821083U CN 220821083 U CN220821083 U CN 220821083U CN 202322257897 U CN202322257897 U CN 202322257897U CN 220821083 U CN220821083 U CN 220821083U
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- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 230000001743 silencing effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a metamaterial sound-absorbing board with a sound wave opposite-impact function, and relates to the technical field of noise control. The sound absorption plate unit comprises a perforated plate and a backboard, wherein perforations are formed in the perforated plate at intervals, and first layer pipes are arranged on the perforated plate downwards through first connecting columns at intervals; the backboard is provided with second layer pipes upwards through second connecting columns at intervals; the single sound-absorbing board unit or the plurality of sound-absorbing board units are combined to form the metamaterial sound-absorbing board, and the end parts of the sound-absorbing board units are connected through the frame structure. The utility model constructs the metamaterial sound-absorbing board capable of eliminating sound waves with different frequencies based on the sound wave opposite-impact principle; the sound wave to be absorbed enters the cavity through the perforated plate, then enters the pipe from the two ends of the first layer pipe and the second layer pipe, the sound wave can be reflected in the pipe for a plurality of times, and the phase of the sound wave can be changed; two sound waves with opposite propagation directions and same frequency are opposite to each other in the pipe, and the two sound waves are offset to achieve the silencing effect.
Description
Technical Field
The utility model relates to the technical field of noise control, in particular to a metamaterial sound-absorbing board with a sound wave opposite-impact function.
Background
Noise refers to unwanted noise, interfering sound, or irregular sound in a particular environment; noise is usually derived from four aspects of industrial production, building construction, transportation and social life, and has great influence on human health.
At present, two sound absorption means of porous sound absorption materials and resonance sound absorption structures are generally adopted to improve noise environment, but the porous sound absorption materials are easily affected by environmental conditions, and the absorption capacity of the porous sound absorption materials on low-frequency noise is poor; the resonance sound absorption structure has the defects of strong selectivity to sound wave frequency and poor sound absorption effect when deviating from the resonance frequency; the sound wave opposite impact means that after two sound waves with opposite phases are overlapped, the amplitude is reduced, the sound pressure is weakened, and if the two sound waves are identical in amplitude, the two sound waves are completely counteracted.
The invention patent with the application number 202010584433.1 discloses a honeycomb noise reduction and silencing plate for a high-speed railway and a use method thereof, wherein a plurality of sound absorption and reflection cups are arranged on a front plate to absorb and reflect sound waves, and the sound waves are opposite-impact neutralized with subsequent sound waves, so that noise is reduced; the sound absorbing material absorbs the noise transmitted through the front panel part to make noise reduction again; the back plate is pressed into honeycomb shape, and the penetrating sound wave is diffused again. The muffler plate disclosed in this patent has the following three drawbacks:
1) The noise frequency range in the environment is wide, no perforated plate is arranged on the outer side of the sound absorption reflection cup to shield, most of incident sound waves are reflected back into the air, the possibility of opposite impact with subsequent sound waves is low, and the noise reduction effect is limited.
2) The size of the sound absorption reflection cup is fixed, and the absorption frequency band of sound waves is narrow.
3) The front plate surface and the back plate surface of the sound-absorbing plate are both in honeycomb structures, sound-absorbing materials are added in the middle, the production and manufacturing process is complex, and the manufacturing cost is high.
Therefore, it is necessary to develop a metamaterial sound-absorbing board capable of absorbing incident sound waves with high efficiency by utilizing sound waves, simple in structure and low in cost.
Disclosure of Invention
The utility model aims to overcome the defects of the background technology and provide the metamaterial sound-absorbing board with the sound wave opposite-impact function.
In order to achieve the above purpose, the technical scheme of the utility model is as follows: a metamaterial sound-absorbing board with sound wave opposite impact function is characterized in that: the sound absorption plate unit comprises a perforated plate and a backboard arranged below the perforated plate, wherein the upper side of the perforated plate faces to the sound source side, perforations are formed in the perforated plate at intervals, first layer pipes are arranged on the perforated plate downwards at intervals through first connecting columns, and the perforations are arranged above a gap between two adjacent first layer pipes;
the backboard is provided with a second layer pipe at intervals upwards through a second connecting column, and the perforation is positioned above the middle part of the second layer pipe;
The single sound-absorbing board unit or the plurality of sound-absorbing board units are combined to form the metamaterial sound-absorbing board, and the end parts of the sound-absorbing board units are connected through the frame structure.
In the technical scheme, the pipe diameters of the first layer pipe and the second layer pipe are smaller than 5cm, the pipe length of the first layer pipe is smaller than that of the second layer pipe, and the pipe lengths of the first layer pipe and the second layer pipe are larger than one fourth of the wavelength of sound waves to be absorbed.
In the above technical scheme, the first layer pipe and the second layer pipe are both round pipes or square pipes.
In the technical scheme, the thickness of the backboard is in the range of 3-25mm, and the backboard is flexibly suspended or rigidly fixed on the ground or the wall surface.
In the above technical solution, the centers of the first layer pipe and the second layer pipe are on a vertical line.
In the technical scheme, the centers of the first layer pipe and the second layer pipe are arranged in a staggered mode.
Compared with the prior art, the utility model has the following advantages:
1) The utility model constructs the metamaterial sound-absorbing board capable of eliminating sound waves with different frequencies based on the sound wave opposite-impact principle; the sound wave to be absorbed enters the cavity through the perforated plate, then enters the pipe from the two ends of the first layer pipe and the second layer pipe, the sound wave can be reflected in the pipe for a plurality of times, and the phase of the sound wave can be changed; two sound waves with opposite propagation directions and same frequency are opposite to each other in the pipe, and the two sound waves are offset to achieve the silencing effect.
2) The back plate is thicker, and the back plate is flexibly suspended or rigidly fixed on the ground or the wall surface, so that direct sound between a sound source and a receiver can be effectively blocked, propagation of sound wave noise is additionally attenuated, and a sound insulation function is achieved.
3) According to the utility model, by changing the aperture, the length, the shape and the arrangement positions of the first layer tube and the second layer tube, sound waves with different frequencies can be absorbed in a targeted manner.
4) The utility model has simple structure, easy processing and convenient installation, can select the used materials according to the actual situation, and has wide application range.
5) The utility model provides a metamaterial sound-absorbing board with a sound wave opposite-impact function, which is different from the traditional sound-absorbing method, and overcomes the defects that a porous sound-absorbing material is easy to fail and a resonance sound-absorbing structure is easy to damage the sound-absorbing board structure due to long-term resonance.
Drawings
FIG. 1 is a schematic view of a combination of multiple units of an acoustic panel to form a metamaterial acoustic panel
Fig. 2 is a sectional view of the sound absorbing panel unit.
Fig. 3 is a side sectional view of embodiment 1 of the present utility model.
Fig. 4 is a side sectional view of embodiment 2 of the present utility model.
Wherein, 1-acoustic board unit, 11-perforated plate, 12-backplate, 111-perforation, 112-first spliced pole, 113-first layer pipe, 121-second spliced pole, 122-second layer pipe, 2-baffle.
Detailed Description
The following detailed description of the utility model is, therefore, not to be taken in a limiting sense, but is made merely by way of example. While the advantages of the utility model will become apparent and readily appreciated by reference to the following description.
As can be seen with reference to the accompanying drawings: the metamaterial sound-absorbing board with the sound wave opposite impact function comprises a sound-absorbing board unit 1, wherein the sound-absorbing board unit 1 comprises a perforated plate 11 and a back plate 12 positioned below the perforated plate 11, the upper side of the perforated plate 11 faces to the sound source side, perforations 111 are spaced on the perforated plate 11, first layer pipes 113 are spaced downwards from the perforated plate 11 through first connecting columns 112, and the perforations 111 are positioned above a gap between two adjacent first layer pipes 113;
The back plate 12 is provided with a second layer pipe 122 at intervals upwards through a second connecting column 121, and the perforation 111 is positioned above the middle part of the second layer pipe 122;
the single sound-absorbing board unit 1 or a plurality of sound-absorbing board units 1 are combined to form the metamaterial sound-absorbing board, and the end parts of the sound-absorbing board units 1 are connected through the frame structure 2.
The connection between the perforated plate 11 and the first connecting column 112 and the connection between the back plate 12 and the second connecting column 121 and the connection between the second connecting tube 122 and the first connecting tube 113 may be any suitable connection, such as welding, screwing or bonding.
The pipe diameters of the first layer pipe 113 and the second layer pipe 122 are smaller than 5cm, the pipe length of the first layer pipe 113 is smaller than that of the second layer pipe 122, and the pipe lengths of the first layer pipe 113 and the second layer pipe 122 are larger than one quarter of the wavelength of sound waves to be absorbed.
The first tube 113 and the second tube 122 are both round tubes or square tubes.
The thickness of the back plate 12 is in the range of 3-25mm, and the back plate 12 is flexibly suspended or rigidly fixed on the ground or the wall surface according to actual conditions.
The centers of the first and second tube 113, 122 are on a vertical line.
The centers of the first layer pipe 113 and the second layer pipe 122 are arranged in a staggered manner.
The distribution of the perforations 111 on the perforated plate 11 and the aperture of the perforations 111 are adjusted according to the actual noise control frequency point.
The application method of the metamaterial sound-absorbing board with the sound wave opposite-impact function comprises the following steps:
Step 1: the single sound-absorbing board units 1 or a plurality of sound-absorbing board units 1 are arranged and combined to form a metamaterial sound-absorbing board, the end parts of the sound-absorbing board units 1 are connected through the partition boards 2, and the backboard 12 is flexibly suspended or rigidly fixed on the ground or the wall surface;
Step 2: the sound waves to be absorbed enter the cavity of the sound-absorbing panel unit 1 through the perforations 111 of the perforated panel 11;
step 3: the sound wave to be absorbed enters the pipeline through the two ends of the first layer pipe 113 and the second layer pipe 122, and the pipe length of the first layer pipe 113 and the second layer pipe 122 is larger than one fourth of the wavelength of the sound wave to be absorbed, so that the sound wave is reflected in the pipeline for multiple times, and the phase of the sound wave to be absorbed is changed;
Step 4: the two sound waves with opposite propagation directions and the same frequency are opposite to each other in the pipeline of the first layer pipe 113 and the second layer pipe 122, and the two sound waves are offset to achieve the silencing effect.
Example 1
As shown in fig. 2, the metamaterial sound-absorbing panel is composed of a perforated plate 11, a first connecting column 112, a first layer tube 113, a second layer tube 122, a second connecting column 121 and a back plate 12 from top to bottom in a side view. The perforated plate 11 and the first layer tube 113 are connected by the first connection column 112, and the second layer tube 122 and the back plate 12 are connected by the second connection column 121. The centers of the first tube 113 and the second tube 4 are on a vertical line.
Example 2
As shown in fig. 1 and 3, the embodiment of example 2 is the same as example 1, and only the positions of the first layer pipe 113 and the second layer pipe 122 are adjusted. The first and second tubes 113 and 122 of example 2 were arranged in a staggered manner, and the centers of the first and second tubes 113 and 122 were not on a vertical line.
Other non-illustrated parts are known in the art.
Claims (6)
1. A metamaterial sound-absorbing board with sound wave opposite impact function is characterized in that: the sound-absorbing plate unit (1) comprises a perforated plate (11) and a back plate (12) positioned below the perforated plate (11), wherein the upper side of the perforated plate (11) faces to the sound source side, perforations (111) are formed in the perforated plate (11) at intervals, first layer pipes (113) are arranged in the perforated plate (11) downwards through first connecting columns (112) at intervals, and the perforations (111) are positioned above a gap between two adjacent first layer pipes (113);
The backboard (12) is provided with second layer pipes (122) at intervals upwards through second connecting columns (121), and the perforations (111) are positioned above the middle part of the second layer pipes (122);
The single sound-absorbing board unit (1) or a plurality of sound-absorbing board units (1) are combined to form the metamaterial sound-absorbing board, and the ends of the sound-absorbing board units (1) are connected through the frame structure (2).
2. The metamaterial sound absorbing panel with sound wave hedging function as claimed in claim 1, wherein: the pipe diameters of the first layer pipe (113) and the second layer pipe (122) are smaller than 5cm, the pipe length of the first layer pipe (113) is smaller than that of the second layer pipe (122), and the pipe lengths of the first layer pipe (113) and the second layer pipe (122) are larger than one fourth of the wavelength of sound waves to be absorbed.
3. A metamaterial sound absorbing panel with sound-wave hedging function as claimed in claim 2, wherein: the first layer pipe (113) and the second layer pipe (122) are round pipes or square pipes.
4. A metamaterial sound absorbing panel with sound-wave hedging function as claimed in claim 3, wherein: the thickness of the backboard (12) is in the range of 3-25mm, and the backboard (12) is flexibly suspended or rigidly fixed on the ground or the wall surface.
5. The metamaterial sound absorbing panel with sound wave hedging function as claimed in claim 4, wherein: the centers of the first layer pipe (113) and the second layer pipe (122) are on a vertical line.
6. The metamaterial sound absorbing panel with sound wave hedging function as claimed in claim 4, wherein: the centers of the first layer pipe (113) and the second layer pipe (122) are arranged in a staggered mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322257897.3U CN220821083U (en) | 2023-08-22 | 2023-08-22 | Metamaterial sound-absorbing board with sound wave opposite-impact function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322257897.3U CN220821083U (en) | 2023-08-22 | 2023-08-22 | Metamaterial sound-absorbing board with sound wave opposite-impact function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220821083U true CN220821083U (en) | 2024-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322257897.3U Active CN220821083U (en) | 2023-08-22 | 2023-08-22 | Metamaterial sound-absorbing board with sound wave opposite-impact function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220821083U (en) |
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2023
- 2023-08-22 CN CN202322257897.3U patent/CN220821083U/en active Active
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