CN212896888U - Ultra-low frequency resonance sound absorption structure - Google Patents
Ultra-low frequency resonance sound absorption structure Download PDFInfo
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- CN212896888U CN212896888U CN202021587158.0U CN202021587158U CN212896888U CN 212896888 U CN212896888 U CN 212896888U CN 202021587158 U CN202021587158 U CN 202021587158U CN 212896888 U CN212896888 U CN 212896888U
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- sound absorption
- low frequency
- frequency resonance
- sound absorbing
- glass fiber
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Abstract
The utility model discloses an ultralow frequency resonance sound absorption structure, including the installation frame that is used for connecting wall body or roof, evenly distributed has a plurality of regular polygon's that are connection frame on the installation frame, goes to the sound-absorbing surface of many pyramids that same direction fixedly connected with formed by the seamless concatenation of polylith sound absorption glass fiber board on each connection frame. An object of the utility model is to provide a sound absorption frequency band is wider, to the better ultralow frequency resonance sound absorption structure of noise sound absorption performance in low frequency and the ultralow frequency range.
Description
Technical Field
The utility model relates to an acoustic material's technical field especially relates to an ultralow frequency resonance sound absorption structure.
Background
Because the low-frequency sound absorption performance of the porous material is poor, a resonance sound absorption structure is often adopted to solve the problems of medium and low frequency sound absorption. When the frequency of the incident sound wave is consistent with the natural frequency of the resonance sound absorption structure, the resonance sound absorption structure generates resonance phenomenon, the sound absorption frequency spectrum of the resonance sound absorption structure takes the resonance frequency as the center to generate an absorption peak, and when the resonance frequency is far away, the sound absorption coefficient is very low. Since low frequency sound waves excite resonance more easily than high frequency sound waves, the main sound absorption band of the resonance sound absorption structure is at a low frequency.
At present, the most common resonant sound absorption structure is a cavity resonant sound absorption structure, which is a structure in which a certain cavity is sealed and is communicated with a sound field space through a small hole with a certain depth. The sound absorption structure formed by arranging air layers and specially manufactured hollow bricks or hollow building blocks with hole necks behind various perforated plates and slit plates is the most common practical application of the cavity resonance sound absorption structure.
However, since the perforated plate and the slit plate both adopt a planar structure, the effective sound absorption area is small, thereby limiting the sound absorption frequency band, affecting the sound absorption performance of the whole resonance sound absorption structure, and particularly, the sound absorption performance of the resonance sound absorption structure is obviously insufficient for the noise in the ultra-low frequency range.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sound absorption frequency band is wider, to the better ultralow frequency resonance sound absorption structure of noise sound absorption performance in low frequency and the ultralow frequency range.
In order to achieve the above object, the utility model discloses an ultralow frequency resonance sound absorption structure, its key lies in, including the installation frame that is used for connecting wall body or roof, evenly distributed has a plurality of regular polygon's that are connection box on the installation frame, goes to the sound absorbing surface of many pyramids that same direction fixedly connected with one is formed by the seamless concatenation of polylith sound absorption glass fiber board on each connection box.
Further, the mounting frame is fixed to a wall or a roof by a load-bearing keel.
Furthermore, an air resonant cavity with a thickness of 80-120 mm is formed between the mounting frame and the wall or the roof.
Furthermore, the bearing keel comprises a main keel and a through keel fixedly connected to the main keel.
Furthermore, the mounting frame is a wooden frame and is connected and fixed with the through keel through self-tapping screws.
Furthermore, each edge of the connecting frame is connected with the bottom edge of each sound absorption glass fiber board through building structural adhesive or/and gun nails.
Furthermore, two adjacent sound absorption glass fiber plates on the sound absorption surface are bonded through a glass fiber adhesive. Furthermore, the sound absorption glass fiber plate has a thickness of 15-30 mm.
Furthermore, the volume weight of the sound absorption glass fiber board is 32-100kg/m3。
Furthermore, the connecting frame is square, and the sound absorption surface is in a quadrangular pyramid shape formed by seamlessly splicing four sound absorption glass fiber plates.
Compared with the prior art, the utility model discloses a show the effect and do:
and (3) applying a gradual transition principle to seamlessly splice a plurality of glass fiber sound absorbing plates which are cut into isosceles triangles into a multi-pyramid sound absorbing surface. Therefore, when sound waves are incident from the tip, due to the gradual transition property of the sound absorption surface, the acoustic impedance of the glass fiber sound absorption plate can be well matched with that of air, so that the sound waves are transmitted into the sound absorption surface and are efficiently absorbed, and the sound absorption performance is obviously improved. The experiment detects that when the frequency range of the environmental noise is between 20 Hz and 200Hz, the sound absorption coefficient is more than 0.80.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a perspective view of the sound absorbing surface of the present invention;
FIG. 3 is a schematic structural view of the connecting frame of the present invention;
wherein: 1-wall body, 2-installation frame, 3-connection frame, 4-sound absorption glass fiber board, 5-sound absorption surface, 6-bearing keel, 7-air resonant cavity, 8-main keel and 9-through keel.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely 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 construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides an ultra-low frequency resonance sound absorption structure, its key lies in, including the installation frame that is used for connecting wall body 1 or roof, evenly distributed has a plurality of connecting frames 3 that are regular polygon on installation frame 2, towards same direction fixedly connected with one by the polygon sound absorption face 5 that the seamless concatenation of polylith sound absorption glass fiber board 4 formed on each connecting frame 3.
In the embodiment, a gradual transition principle is applied, and a plurality of glass fiber sound absorbing plates 4 which are cut into isosceles triangles are seamlessly spliced into a multi-pyramid sound absorbing surface 5. Therefore, when sound waves are incident from the tip, due to the gradual transition property of the sound absorption layer, the acoustic impedance of the glass fiber sound absorption plate 4 can be well matched with that of air, so that the sound waves are transmitted into the sound absorption surface 5 and are efficiently absorbed, and the sound absorption performance is obviously improved. The experiment detects that when the frequency range of the environmental noise is between 20 Hz and 200Hz, the sound absorption coefficient is more than 0.80.
Preferably, n sides of the connection frame 3 satisfy that 2n/(n-2) is a positive integer, and n.gtoreq.3.
In the embodiment, the connection frames 3 are seamlessly spliced into the installation frame by applying the plane mosaic principle, and the outer surfaces of the sound absorption surfaces 5 are continuously arranged, so that the relative sealing is ensured, the sound absorption surface has good reflection, diffraction and scattering functions, and the sound absorption performance is obviously superior to that of the prior art. Note that, the planar mosaic formula (n-2) × 180/n × m ═ 360 can give m ═ 2n/(n-2), and since the planar mosaic formula satisfies that m is a positive integer, when 2n/(n-2) is a positive integer, the connection frame 3 can be seamlessly spliced on the same plane.
Referring to fig. 1, specifically, the mounting frame 2 is fixed to a wall or a roof through a bearing keel 6.
In order to further enhance the sound absorption effect, specifically, an air resonance cavity 7 with a thickness of 80-120 mm is enclosed between the mounting frame 2 and the wall 1 or the roof.
Specifically, the bearing keel 6 comprises a main keel 8 and a through keel 9 fixedly connected to the main keel 8.
Specifically, the mounting frame 2 is a wooden frame and is connected and fixed with the through keel 9 through a self-tapping screw.
Specifically, each side of the connecting frame 3 is connected with the bottom edge of each sound absorption glass fiber plate 4 through building structural adhesive or/and gun nails.
Referring to fig. 2, specifically, two adjacent sound absorption glass fiber plates 4 on the sound absorption surface 5 are bonded by a glass fiber adhesive.
Specifically, the thickness of the sound absorption glass fiber plate 4 is 15-30 mm.
Specifically, the volume weight of the sound absorption glass fiber plate 4 is 32-100kg/m3。
Referring to fig. 2 and 3, specifically, the connecting frame 3 is square, and the sound-absorbing surface 5 is a quadrangular pyramid formed by joining four sound-absorbing glass fiber plates 4 in a seamless manner.
It can be understood that the volume weight, size and thickness of the air cavity of the outer glass fiber board and the inner glass fiber board can be flexibly selected under the condition of simultaneously ensuring construction requirements and indoor sound environment requirements.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. The ultra-low frequency resonance sound absorption structure is characterized by comprising an installation frame used for connecting a wall body or a roof, wherein a plurality of connecting frames in a regular polygon shape are uniformly distributed on the installation frame, and a multi-pyramid-shaped sound absorption surface formed by seamlessly splicing a plurality of sound absorption glass fiber plates is fixedly connected to each connecting frame in the same direction.
2. The ultra low frequency resonance sound absorbing structure as set forth in claim 1, wherein the mounting frame is fixed to a wall or a roof by a load-bearing keel.
3. The ultra-low frequency resonance sound absorption structure according to claim 2, wherein an air resonance cavity with a thickness of 80-120 mm is formed between the mounting frame and the wall or the roof.
4. The ultra low frequency resonance sound absorbing structure as set forth in claim 2 or 3, wherein the load bearing keel comprises a main keel and a through keel fixedly connected to the main keel.
5. The ultra-low frequency resonance sound absorption structure according to claim 4, wherein the mounting frame is a wooden frame and is connected and fixed with the through keel by a self-tapping screw.
6. The ultra low frequency resonance sound absorbing structure as set forth in claim 1, wherein the respective sides of the coupling frame are coupled to the bottom edge of each of the sound absorbing glass fiber sheets by means of construction glue or/and gun nails.
7. The ultra low frequency resonance sound absorbing structure as set forth in claim 6, wherein two adjacent sound absorbing glass fiber plates on the sound absorbing surface are bonded by a glass fiber adhesive.
8. The ultra low frequency resonance sound absorbing structure as set forth in claim 6 or 7, wherein the sound absorbing fiberglass plate has a thickness of 15-30 mm.
9. The ultra low frequency resonance sound absorbing structure as set forth in claim 8, wherein the sound absorbing glass fiber plate has a volume weight of 32-100kg/m3。
10. The ultra-low frequency resonance sound absorption structure according to claim 1, wherein the connection frame is square, and the sound absorption surface is in a quadrangular pyramid shape formed by seamlessly splicing four sound absorption glass fiber plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021587158.0U CN212896888U (en) | 2020-08-03 | 2020-08-03 | Ultra-low frequency resonance sound absorption structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021587158.0U CN212896888U (en) | 2020-08-03 | 2020-08-03 | Ultra-low frequency resonance sound absorption structure |
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| Publication Number | Publication Date |
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| CN212896888U true CN212896888U (en) | 2021-04-06 |
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| CN202021587158.0U Active CN212896888U (en) | 2020-08-03 | 2020-08-03 | Ultra-low frequency resonance sound absorption structure |
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| CN (1) | CN212896888U (en) |
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