CN113628604B - Spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption - Google Patents
Spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption Download PDFInfo
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- CN113628604B CN113628604B CN202110886647.9A CN202110886647A CN113628604B CN 113628604 B CN113628604 B CN 113628604B CN 202110886647 A CN202110886647 A CN 202110886647A CN 113628604 B CN113628604 B CN 113628604B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 65
- 238000005452 bending Methods 0.000 title claims abstract description 41
- 238000005192 partition Methods 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000011148 porous material Substances 0.000 claims description 5
- 229920006351 engineering plastic Polymers 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 2
- 239000011358 absorbing material Substances 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Acoustics & Sound (AREA)
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention relates to a spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption, which comprises a left side plate, a right side plate, an upper panel, a bottom lining plate, a partition plate and porous sound absorption materials; the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate form a space bending channel, and the porous sound absorbing material is embedded in the space bending channel. According to the invention, under the condition that the thickness of the material is not increased, the propagation path of sound waves is greatly increased, the acoustic energy loss is increased, so that the super structure has excellent low-frequency sound absorption performance, the super structure has the advantage of large absorption bandwidth, when the wave crest frequency is similar, the sound absorption coefficient is more than 0.8, the structure has the bandwidth of 220Hz, the sound absorption frequency band can be adjusted by adjusting the number of channels or the channel layout of the space bending structure, and the sound absorption of the low-frequency broadband can be realized by arranging units of different sound absorption frequency bands in parallel; simple structure, easy production and low cost, and has wide engineering application prospect in the field of low-frequency noise.
Description
Technical Field
The invention belongs to the field of composite structure acoustic meta-materials combining porous sound absorption materials and bending channels, and particularly relates to a spatial bending porous meta-structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption.
Background
The social life noise replaces industrial noise and traffic noise to become the most dominant noise pollution source in the urban resident acoustic environment, and the noise generated by various power equipment in urban public buildings and high-rise houses mainly with low frequency is already the most dominant social noise source. For low frequency noise, conventional sound absorbing materials require a thickness comparable to the wavelength to achieve the desired sound absorbing effect, which is a great inconvenience for engineering applications and also increases the cost of noise control.
The spatial bending super structure has good low-frequency sound absorption performance, good structural strength and small thickness, but the sound absorption bandwidth of the structure is narrow, which limits the application of the structure in practical engineering, as shown in Acoustic metasurface-based perfect absorber with deep subwavelength thickness published in APPLIED PHYSICS LETTERS by Li Y and Assouar BM. While having a design that curls multiple channels in three dimensions can widen its sound absorption bandwidth, this design greatly increases manufacturing difficulties, as described in Three-dimensional single-port labyrinthine acoustic metamaterial:Perfect absorption with large bandwidth and tenability published by Zhang C and hux at PHYSICAL REVIEW APPLIED.
Disclosure of Invention
The invention solves the technical problems that: aiming at the defects of the traditional sound absorption material and the spatial bending super structure in low frequency and broadband sound absorption and the inconvenience of engineering application, the invention provides the low frequency sound absorption super structure based on the traditional porous sound absorption material and the spatial bending structure; by embedding the traditional porous sound absorption material in the channel of the bending structure, the propagation path of sound waves in the structure is increased on the premise of not increasing the thickness of the sound absorption layer, so that the problems that the traditional sound absorption material is limited by the thickness and the sound absorption bandwidth of the spatial bending structure is narrow during low-frequency sound absorption are solved.
The technical scheme of the invention is as follows: the utility model provides a porous super structure of space bending of sound absorption frequency channel adjustable and low frequency broadband sound absorption which characterized in that: comprises a left side plate, a right side plate, an upper panel, a bottom lining plate and a plurality of partition plates;
the upper panel and the bottom lining plate are parallel to each other; the left side plate, the right side plate and the plurality of partition plates are mutually parallel, and the side plates and the partition plates are mutually perpendicular to the upper panel; the upper panel faces the sound source, and the bottom substrate faces away from the sound source;
The plurality of partition boards are respectively arranged on the upper panel and the bottom lining board to form a space bending channel; porous materials are embedded in the space bending channels.
The invention further adopts the technical scheme that: the partition boards comprise a first partition board, a second partition board and a third partition board, wherein the first partition board is vertically and fixedly connected with the upper panel and is close to the left side board, the second partition board is vertically and fixedly connected with the bottom lining board, and the third partition board is vertically and fixedly connected with the upper panel and is close to the right side board; the second separator is located between the first separator and the third separator.
The invention further adopts the technical scheme that: the width between the side plates and the partition plates, and between the partition plates and the partition plates is defined as w, the distance between the partition plates and the face plate or the bottom lining plate is defined as d, and w=d.
The invention further adopts the technical scheme that: the porous sound absorbing material has a porosity greater than 0.8.
The invention further adopts the technical scheme that: the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate are made of light metal or engineering plastics.
Effects of the invention
The invention has the technical effects that: the invention provides a spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption, which comprises a left side plate, a right side plate, an upper panel, a bottom lining plate, a partition plate and porous sound absorption materials; the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate form a space bending channel, and the porous sound absorbing material is embedded in the space bending channel. Under the condition of not increasing the thickness of the material, the invention greatly increases the propagation path of sound waves and increases the loss of sound energy, so that the ultrasonic structure has excellent low-frequency sound absorption performance, as shown in figure 3; compared with the existing super structure, the structure has the advantage of large absorption bandwidth, when the wave crest frequency is similar, the sound absorption coefficient is more than 0.8, the structure has the bandwidth of 220Hz, and the absorption bandwidth of the existing super structure is less than 40Hz as shown in figure 5; the sound absorption frequency band can be adjusted by adjusting the number of channels or the channel layout of the space bending structure, and the sound absorption of the low-frequency broadband can be realized by arranging units of different sound absorption frequency bands in parallel; simple structure, easy production and low cost, and has wide engineering application prospect in the field of low-frequency noise.
Drawings
FIG. 1 is a schematic three-dimensional structure of one embodiment of a spatially folded porous superstructure of the present invention;
FIG. 2 is a front view of one embodiment of a spatially folded porous superstructure of the present invention.
FIG. 3 is a schematic view of the acoustic propagation path of one embodiment of the spatially folded porous superstructure of the present invention.
FIG. 4 is a graph of sound absorption coefficients for one embodiment of a spatially folded porous superstructure of the present invention.
Fig. 5 is a graph of the sound absorption coefficient of a prior art superstructure.
Reference numerals illustrate: 1. a left side plate; 2. a right side plate; 3, upper panel; 4. a bottom lining plate; 5. 6,7, a separator; 8. porous sound absorbing material.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 5, a spatial bending porous superstructure with adjustable sound absorption frequency band and low frequency broadband sound absorption is characterized in that: the device comprises a left side plate, a right side plate, an upper panel, a bottom lining plate, a partition plate and a porous sound absorption material; the left side plate, the right side plate and the partition plate are parallel to each other, the upper cover partition plate and the bottom lining partition plate are parallel to each other and are perpendicular to the left side plate, the right side plate and the partition plate, the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate are connected to form a space bending channel, and the porous material is embedded in the bending channel to form a space bending porous super-structure unit; the upper panel faces the sound source and the bottom panel faces away from the sound source.
Further, the thickness of the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate is 0.20 mm-2 mm.
Further, the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate are made of light metal or engineering plastics.
Further, the bending channel of the space bending structure is not limited to the equal width channel, and may be arranged from narrow to wide, from wide to narrow or any width.
Further, the channel width w is equal to or different from the opening d at the bend adjacent to the rear.
Further, the porous sound absorbing material has a porosity greater than 0.8.
The embodiment is a spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption.
Referring to fig. 1, the spatial bending porous super structure of the embodiment is composed of a left side plate 1, a right side plate 2, an upper panel 3, a bottom lining plate 4, partition plates 5,6 and 7 and a porous sound absorbing material 8; the left side plate 1, the right side plate 2 and the partition plates 5,6 and 7 are parallel to each other and perpendicular to the upper panel 3 and the bottom lining plate 4 which are parallel to each other, and the distances between the two adjacent plates are equal; the left side plate 1, the right side plate 2, the upper panel 3, the bottom lining plate 4, the partition plates 5,6 and 7 form a space bending structure, and the porous sound absorbing material 8 is embedded in a channel of the space bending structure to form a space bending porous super-structure unit; the upper panel 3 faces the sound source and the bottom liner 4 faces away from the sound source.
The size of the spatial bending porous super structure in this embodiment is 101.5mm×100mm×50mm.
In this embodiment, the thickness of the left side plate 1, the right side plate 2, the upper panel 3, the bottom lining plate 4, the partition plates 5,6, 7 is 0.5mm.
In this embodiment, the left side plate 1, the right side plate 2, the upper panel 3, the bottom lining plate 4, the partition plates 5, 6, and 7 are made of engineering plastics.
The porosity of the porous sound absorbing material in this example was 0.973.
In this embodiment, the channel width w and the opening size d at the bending position are both 25mm.
In the design example, in the investigation frequency range of 0-1600 Hz, the sound absorption coefficient curve corresponding to the spatial bending porous superstructure is shown in figure 4, two absorption peaks are respectively 370Hz and 1140Hz, and the corresponding sound absorption coefficients are respectively 0.96 and 0.8; the frequency band with the sound absorption coefficient larger than 0.8 is 260-480 Hz; the frequency band with the sound absorption coefficient larger than 0.5 is 190-1470 Hz.
While the above description has been made of an example of the spatial bending porous superstructure of the present invention, the protection content of the present invention is not limited to the above example, and various changes can be made within the technical scope of the present invention by grasping the basic theory, for example, the channel layout is not limited to the same width, and may be a gradual change channel from narrow to wide or from wide to narrow. All changes and modifications that are made within the scope of the present invention are intended to fall within the scope of the present invention.
Claims (4)
1. The utility model provides a porous super structure of space bending of sound absorption frequency channel adjustable and low frequency broadband sound absorption which characterized in that: comprises a left side plate (1), a right side plate (2), an upper panel (3), a bottom lining plate (4) and a plurality of partition plates;
the upper panel (3) and the bottom lining plate (4) are parallel to each other; the left side plate (1), the right side plate (2) and the plurality of partition plates are mutually parallel, and the side plates and the partition plates are mutually perpendicular to the upper panel (3); the upper panel faces the sound source, and the bottom substrate faces away from the sound source;
The plurality of partition boards are respectively arranged on the upper panel (3) and the bottom lining board (4) to form a space bending channel; the space bending channel is embedded with a porous material, the porosity of the porous material is 0.973, and the porous material is embedded in the channel of the bending structure, so that the propagation path of sound waves in the structure is increased on the premise of not increasing the thickness of the sound absorption layer, and the problems that the traditional sound absorption material is limited by the thickness and the sound absorption bandwidth of the space bending structure is narrow during low-frequency sound absorption are solved.
2. The spatially folded porous superstructure of sound absorption band adjustable and low frequency broadband sound absorption of claim 1, wherein: the partition board comprises a first partition board (5), a second partition board (6) and a third partition board (7), wherein the first partition board (5) is vertically and fixedly connected with the upper panel (3) and is close to the left side board (1), the second partition board (6) is vertically and fixedly connected with the bottom lining board (4), and the third partition board (7) is vertically and fixedly connected with the upper panel (3) and is close to the right side board (2); the second separator (6) is located between the first separator (5) and the third separator (7).
3. The spatial bending porous superstructure of sound absorption frequency band adjustable and low frequency broadband sound absorption of claim 2, wherein: the width between the side plates and the partition plates, and between the partition plates and the partition plates is defined as w, the distance between the partition plates and the face plate or the bottom lining plate is defined as d, and w=d.
4. The spatially folded porous superstructure of sound absorption band adjustable and low frequency broadband sound absorption of claim 1, wherein: the left side plate, the right side plate, the upper panel, the bottom lining plate and the partition plate are made of light metal or engineering plastics.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110886647.9A CN113628604B (en) | 2021-08-03 | 2021-08-03 | Spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110886647.9A CN113628604B (en) | 2021-08-03 | 2021-08-03 | Spatial bending porous super structure with adjustable sound absorption frequency band and low-frequency broadband sound absorption |
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| CN113628604B true CN113628604B (en) | 2024-08-20 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100924958B1 (en) * | 2009-06-04 | 2009-11-06 | 한국방진방음 주식회사 | Duct Silencer for Air Conditioning Having Resonance Type Splitter |
| US9390702B2 (en) * | 2014-03-27 | 2016-07-12 | Acoustic Metamaterials Inc. | Acoustic metamaterial architectured composite layers, methods of manufacturing the same, and methods for noise control using the same |
| RU2579021C1 (en) * | 2014-08-27 | 2016-03-27 | Олег Савельевич Кочетов | Acoustic panel |
| EP3570273B1 (en) * | 2017-04-26 | 2021-06-23 | Dalian University Of Technology | Broadband ultra-thin sound absorbing and insulating structure controlling sound wave propagation path |
| CN109671419B (en) * | 2018-12-28 | 2024-01-12 | 西安交通大学 | Slotting double-porosity sound absorption device and application thereof |
| CN109686354B (en) * | 2018-12-28 | 2024-01-12 | 西安交通大学 | Spiral perforated double-porosity sound absorption device and application thereof |
| CN112634854A (en) * | 2020-12-17 | 2021-04-09 | 华中科技大学 | Sound absorption performance-adjustable sound absorption metamaterial and additive manufacturing method thereof |
| CN113053343B (en) * | 2021-03-15 | 2023-12-19 | 西北工业大学 | Space bending low-frequency sound absorption super structure based on groove-type corrugated layer core |
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2021
- 2021-08-03 CN CN202110886647.9A patent/CN113628604B/en active Active
Non-Patent Citations (1)
| Title |
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| Low-frequency sound absorption of hybrid absorber based on micro-perforated panel and coiled-up channels;Fei Wu.etc;Applied Physics Letters;第3-7栏，图1-3 * |
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