CN113628604A - Spatial bending porous superstructure with adjustable sound absorption frequency band and low-frequency broadband sound absorption - Google Patents
Spatial bending porous superstructure with adjustable sound absorption frequency band and low-frequency broadband sound absorption Download PDFInfo
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- CN113628604A CN113628604A CN202110886647.9A CN202110886647A CN113628604A CN 113628604 A CN113628604 A CN 113628604A CN 202110886647 A CN202110886647 A CN 202110886647A CN 113628604 A CN113628604 A CN 113628604A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 66
- 238000005452 bending Methods 0.000 title claims abstract description 35
- 238000005192 partition Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 15
- 229920006351 engineering plastic Polymers 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 239000011358 absorbing material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 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
- 238000012552 review Methods 0.000 description 1
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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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Abstract
The invention relates to a space bending porous superstructure 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 a porous sound absorption material, wherein the left side plate is provided with a left side plate and a right side plate; 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 absorption material is embedded in the space bending channel. Under the condition of not increasing the thickness of materials, the invention greatly increases the propagation path of sound waves, increases the loss of sound energy, and ensures that the superstructure has excellent low-frequency sound absorption performance, the structure has the advantage of large absorption bandwidth, when the wave crest frequencies are close, 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 juxtaposing the units of different sound absorption frequency bands; the structure is simple, the production is easy, the cost is low, and the method 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 metamaterials combining porous sound absorption materials and bent channels, and particularly relates to a low-frequency broadband sound absorption space bent porous superstructure with an adjustable sound absorption frequency band.
Background
The social life noise replaces industrial noise and traffic noise to be the most main noise pollution source in the urban resident living sound environment, and the noise generated by various power equipment in urban public buildings and high-rise residences mainly with low frequency becomes the most main social noise source. For low frequency noise, the conventional sound absorbing material needs a thickness equivalent to a wavelength to achieve a desired sound absorbing effect, which causes great inconvenience to engineering applications and also increases the cost of noise control.
The spatial bending superstructure has good low-frequency sound absorption performance, good structural strength and small thickness, but the sound absorption bandwidth of the structure is narrow, so that the application of the spatial bending superstructure in practical engineering is limited, for example, the spatial bending superstructure has been described in the Acoustic surface-based permanent adsorbent with deep subwavelength of the Applied Physics Letters by Li Y and Assoar BM. Although a design that curls multiple channels in Three dimensions can broaden the sound absorption bandwidth, it can greatly increase the difficulty of manufacturing, as described by Zhang C and Hu X in the Three-dimensional simple-port acoustic evaluation by Physical Review application, Perfect absorption with large bandwidth and reliability.
Disclosure of Invention
The technical problem solved by the invention is as follows: aiming at the defects of low-frequency and broadband sound absorption and the inconvenience of engineering application of the traditional sound absorption material and the space bending superstructure, the invention provides a low-frequency sound absorption superstructure based on the traditional porous sound absorption material and the space bending structure; through embedding traditional porous sound absorbing material in the passageway of structure of buckling, increased the propagation path of sound wave in the structure under the prerequisite that does not increase the sound absorbing layer thickness to solve traditional sound absorbing material and receive thickness restriction, space structure sound absorption bandwidth narrow scheduling problem when the low frequency sound absorption.
The technical scheme of the invention is as follows: the utility model provides a porous superstructure of space bending that sound absorption frequency channel is 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 parallel to each other, and the side plates and the partition plates are perpendicular to the upper plate; the upper panel faces the sound source, and the bottom lining plate faces away from the sound source;
the plurality of partition plates are respectively arranged on the upper panel and the bottom lining plate to form a space bending channel; porous materials are embedded in the space bending channels.
The further technical scheme of the invention is as follows: the partition plates comprise a first partition plate, a second partition plate and a third partition plate, wherein the first partition plate is vertically and fixedly connected with the upper panel and close to the left side plate, the second partition plate is vertically and fixedly connected with the bottom lining plate, and the third partition plate is vertically and fixedly connected with the upper panel and close to the right side plate; the second partition is located between the first partition and the third partition.
The further technical scheme of the invention is as follows: the width between the side plates and the partition plates and the width between the partition plates are defined as w, the distance between the partition plates and the panel or the bottom lining plate is defined as d, and w is equal to d.
The further technical scheme of the invention is as follows: the porosity of the porous sound absorption material is more than 0.8.
The further technical scheme of the invention is as follows: 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 space bending porous superstructure 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 a porous sound absorption material, wherein the left side plate is provided with a left side plate and a right side plate; 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 absorption material is embedded in the space bending channel. Under the condition that the thickness of the material is not increased, the invention greatly increases the propagation path of sound waves, increases the loss of sound energy, and ensures that the superstructure has excellent low-frequency sound absorption performance, as shown in figure 3; compared with the existing superstructure, the structure has the advantage of large absorption bandwidth, when the peak frequencies are close, the sound absorption coefficient is more than 0.8, the structure has the bandwidth of 220Hz, and the absorption bandwidth of the existing superstructure is less than 40Hz, as shown in FIG. 5; the sound absorption frequency band can be adjusted by adjusting the number of channels or the channel layout of the spatial bending structure, and the sound absorption of a low-frequency broadband can be realized by juxtaposing units of different sound absorption frequency bands; the structure is simple, the production is easy, the cost is low, and the method 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 bent porous superstructure of the present invention;
FIG. 2 is a front view of one embodiment of the spatially bent porous superstructure of the present invention.
Fig. 3 is a schematic diagram of the acoustic propagation path of one embodiment of the spatially bent porous superstructure of the present invention.
Fig. 4 is an acoustic absorption coefficient plot for one embodiment of the spatially bent porous superstructure of the present invention.
Figure 5 is an acoustical absorption coefficient plot of an existing superstructure.
Description of reference numerals: 1. a left side plate; 2. a right side plate; 3, an upper panel; 4. a backing plate; 5. 6, 7, a clapboard; 8. a porous sound absorbing material.
Detailed Description
In the description of the present invention, it is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 1-5, a spatial bending porous superstructure with adjustable sound absorption frequency band and low-frequency broadband sound absorption is characterized in that: comprises a left side plate, a right side plate, an upper panel, a bottom lining plate, a clapboard 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 porous materials are embedded in the bending channel to form a space bending porous superstructure unit; the upper panel faces the sound source and the bottom lining plate faces away from the sound source.
Furthermore, 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.
Furthermore, 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.
Furthermore, the bending channel of the spatial bending structure is not limited to the channel with the same width, and may be arranged and combined from narrow to wide, from wide to narrow or in any width.
Further, the width w of the channel is equal to or different from the size d of the opening at the adjacent bent part behind.
Further, the porosity of the porous sound absorption material is more than 0.8.
The embodiment is a spatial bending porous superstructure with adjustable sound absorption frequency band and low-frequency broadband sound absorption.
Referring to fig. 1, the spatial bent porous superstructure 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 absorption material 8; five plates of the left side plate 1, the right side plate 2 and the partition plates 5, 6 and 7 are parallel to each other and vertical to the upper plate 3 and the bottom gusset plate 4 which are parallel to each other, and the distance between two adjacent plates is equal; the left side plate 1, the right side plate 2, the upper panel 3, the bottom lining plate 4 and the partition plates 5, 6 and 7 form a space bending structure, and the porous sound absorption material 8 is embedded in a channel of the space bending structure to form a space bending porous superstructure unit; the upper panel 3 faces the sound source and the backing plate 4 faces away from the sound source.
The size of the spatially bent porous superstructure of this example was 101.5mm 100mm 50 mm.
In this embodiment, the left side plate 1, the right side plate 2, the upper plate 3, the bottom gusset plate 4, and the partition plates 5, 6, and 7 have a thickness of 0.5 mm.
In this embodiment, the left side plate 1, the right side plate 2, the upper plate 3, the bottom lining plate 4, and 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 width w of the channel and the size d of the opening at the bending part are both 25 mm.
In the design example, in an investigation frequency band of 0-1600 Hz, a sound absorption coefficient curve corresponding to the space bending porous superstructure is shown in FIG. 4, and has two absorption peaks, namely 370Hz and 1140Hz, and the corresponding sound absorption coefficients are 0.96 and 0.8 respectively; 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.
The above description has been made on an example of the spatial bending porous superstructure of the present invention, but the protection content of the present invention is not limited to the above example, and in the technical field of the present invention, as long as the basic theory is grasped, various changes can be made within the technical gist range, such as the channel layout is not limited to the equal width, and may be a gradual channel from narrow to wide or from wide to narrow. All changes, modifications and the like which are made within the scope of the application of the invention belong to the patent flip cover scope of the invention.
Claims (5)
1. The utility model provides a porous superstructure of space bending that sound absorption frequency channel is 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 clapboards;
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 parallel to each other, and the side plates and the partition plates are vertical to the upper panel (3); the upper panel faces the sound source, and the bottom lining plate faces away from the sound source;
the plurality of partition plates are respectively arranged on the upper panel (3) and the bottom lining plate (4) to form a space bending channel; porous materials are embedded in the space bending channels.
2. The spatially curved porous superstructure for adjustable sound absorption band and low frequency broadband sound absorption according to claim 1, wherein: the partition plates comprise a first partition plate (5), a second partition plate (6) and a third partition plate (7), wherein the first partition plate (5) is vertically and fixedly connected with the upper panel (3) and close to the left side plate (1), the second partition plate (6) is vertically and fixedly connected with the bottom gusset plate (4), and the third partition plate (7) is vertically and fixedly connected with the upper panel (3) and close to the right side plate (2); the second partition (6) is located between the first partition (5) and the third partition (7).
3. The spatial bending porous superstructure of claim 2, capable of adjusting sound absorption frequency band and absorbing sound in low frequency broadband, characterized in that: the width between the side plates and the partition plates and the width between the partition plates are defined as w, the distance between the partition plates and the panel or the bottom lining plate is defined as d, and w is equal to d.
4. The spatially curved porous superstructure for adjustable sound absorption band and low frequency broadband sound absorption according to claim 1, wherein: the porosity of the porous sound absorption material is more than 0.8.
5. The spatially curved porous superstructure for adjustable sound absorption band and low frequency broadband sound absorption according to 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 CN113628604A (en) | 2021-08-03 | 2021-08-03 | Spatial bending porous superstructure 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 CN113628604A (en) | 2021-08-03 | 2021-08-03 | Spatial bending porous superstructure with adjustable sound absorption frequency band and low-frequency broadband sound absorption |
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Citations (5)
| 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 |
| CN109671419A (en) * | 2018-12-28 | 2019-04-23 | 西安交通大学 | One kind is cracked basis of dual porosity rate sound absorber and its application |
| US20190378490A1 (en) * | 2017-04-26 | 2019-12-12 | Dalian University Of Technology | Broadband ultrathin sound absorption or sound insulation structure controlling an acoustic wave propagation path |
| 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 |
| CN113053343A (en) * | 2021-03-15 | 2021-06-29 | 西北工业大学 | Space bending low-frequency sound absorption superstructure based on groove-cutting type corrugated layer core |
-
2021
- 2021-08-03 CN CN202110886647.9A patent/CN113628604A/en active Pending
Patent Citations (5)
| 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 |
| US20190378490A1 (en) * | 2017-04-26 | 2019-12-12 | Dalian University Of Technology | Broadband ultrathin sound absorption or sound insulation structure controlling an acoustic wave propagation path |
| CN109671419A (en) * | 2018-12-28 | 2019-04-23 | 西安交通大学 | One kind is cracked basis of dual porosity rate sound absorber and its application |
| 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 |
| CN113053343A (en) * | 2021-03-15 | 2021-06-29 | 西北工业大学 | Space bending low-frequency sound absorption superstructure based on groove-cutting type corrugated layer core |
Non-Patent Citations (2)
| Title |
|---|
| FEI WU.ETC: "Low-frequency sound absorption of hybrid absorber based on micro-perforated panel and coiled-up channels", APPLIED PHYSICS LETTERS, pages 3 - 7 * |
| 吴飞;黄威;陈文渊;肖勇;郁殿龙;温激鸿;: "基于微孔板与折曲通道的亚波长宽带吸声结构设计", 物理学报, no. 13 * |
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