CN113362795B - Petal-shaped channel porous sound absorption structure - Google Patents
Petal-shaped channel porous sound absorption structure Download PDFInfo
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- CN113362795B CN113362795B CN202110506484.7A CN202110506484A CN113362795B CN 113362795 B CN113362795 B CN 113362795B CN 202110506484 A CN202110506484 A CN 202110506484A CN 113362795 B CN113362795 B CN 113362795B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 61
- 239000011148 porous material Substances 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 4
- 239000006261 foam material Substances 0.000 claims description 4
- 239000002023 wood Substances 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 8
- 239000000463 material Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000009467 reduction 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a petal-shaped channel porous sound absorption structure, wherein a perforated panel is arranged on a rigid backing, a plurality of petal-shaped micro-channels are arranged on the perforated panel at intervals in parallel, and the radius r of each petal-shaped micro-channel meets the function relation of polar coordinates theta. The sound absorber has the advantages of simple structure, convenient use, excellent sound absorption effect and wider sound absorption frequency band, can be suitable for indoor walls and inner wall surfaces of vehicles, and can better replace the existing artificial porous sound absorber.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a petal-shaped channel porous sound absorption structure.
Background
The existing porous sound absorption structure is a structure for absorbing sound by utilizing an internal sound absorption micro-channel energy dissipation mode, and is mainly applied to scenes such as music halls, museums, libraries, inner wall surfaces of vehicles and the like. In practical engineering application, the sound absorption structure is required to be light and thin enough, so that the occupied volume of the sound absorption structure can be reduced, the sound absorption structure is convenient to flexibly install, and the traditional sound absorption structure is large in size and cannot fully meet engineering requirements. Meanwhile, because the wavelength of the low-frequency sound wave is longer, the traditional sound absorption structure is difficult to show good sound absorption performance on the low-frequency sound wave under the small-size thickness, and the problem that the sound absorption frequency band is difficult to adjust and the sound absorption effect is poor exists.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides the petal-shaped channel porous sound absorption structure which is simple and reasonable in structure and convenient to use, and the porous sound absorption body which can adjust the sound absorption frequency band and improve the sound absorption effect is provided by changing the pore shape.
The invention adopts the following technical scheme:
The utility model provides a petal type passageway porous sound absorbing structure, includes the rigidity back lining, is provided with the perforation panel on the rigidity back lining, and the interval is arranged in parallel on the perforation panel has a plurality of petal type micro-channels, and the radius r of petal type micro-channel satisfies polar coordinate theta functional relation as follows:
r(θ)＝D[0.5-εsin(nθ)]
Wherein D is the average pore diameter of the petal-shaped micro-channel; e is the amplitude of the radius change of the petal-shaped micro-channel; n is the number of petals of the petal-shaped micro-channel, and epsilon is the relative roughness.
Specifically, the shape of the petal-shaped microchannel includes one or more of the functions r (θ) determined.
Specifically, the petal number n of the petal-shaped micro-channel is [0,12], and the variation range of the relative roughness epsilon is [0,0.1].
Specifically, the average pore diameter D of the petal-shaped micro-channel is sub-millimeter.
Further, the average pore diameter D of the petal-shaped micro-channel is 0.1-1 mm.
Specifically, the porosity of the petal-shaped micro-channel is 30% -82.6%.
Specifically, the direction of the openings of the petal-shaped micro-channels is perpendicular to the perforated panel.
Specifically, the perforated panel is disposed toward the sound source and the rigid backing is disposed away from the sound source.
Specifically, the thickness of the perforated panel is 2-10 cm.
Specifically, the perforated panel is made of wood board, plastic, porous fiber or porous foam material.
Compared with the prior art, the invention has at least the following beneficial effects:
According to the petal-shaped channel porous sound absorption structure, the petal-shaped micro-channels are arranged on the perforated panel at intervals in parallel, the radius r of each petal-shaped micro-channel meets the function relation of the polar coordinates theta, the petal holes determined according to the function r (theta) can consume sound energy better, the sound absorption frequency band can be adjusted by adjusting the relative roughness and the petal number, the sound absorption frequency band is adjusted by adjusting the hole shape, and the application frequency band range of the sound absorption structure is widened; the rough pore shape control function is simple and easy to adjust.
Further, the petal hole shape is one or more determined by a function r (theta), so that the aim of better adjusting the sound absorption frequency band is fulfilled.
Further, the number n of petals is [0,12], the variation range of the relative roughness epsilon is [0,0.2], and the sound absorption peak value and the sound absorption frequency band of the material can be flexibly adjusted by adjusting the relative roughness and the spatial wave number.
Further, the diameter D of the hole is in a sub-millimeter level, so that the sound absorption effect is effectively improved.
Furthermore, the diameter D of the reference hole is 0.1-1 mm, so that air can be guaranteed to enter better, and the situation that the sound absorption effect is poor due to overlarge hole diameter is avoided.
Furthermore, the porosity is 30% -82.6%, so that the sound absorption efficiency of the material can be improved, and the material is lighter.
Further, the arrangement of the sound absorbing holes with the opening direction perpendicular to the porous material plate can enable sound waves to enter the porous material better.
Further, the sheet of material faces the sound source and the rigid backing faces away from the sound source, allowing sound to enter the sound absorber and be partially or fully absorbed.
Furthermore, when the thickness of the material plate is 2-10 cm, the material plate is ensured to have certain rigidity, and the weight of the material plate cannot be too large due to too thick material plate.
Further, the sound absorption panel is made of wood plates or made of plastic, porous fiber or porous foam materials, so that the porous sound absorption structure can have a certain mechanical bearing performance under the condition of lighter weight.
In conclusion, the sound absorber disclosed by the invention has the advantages of simple structure, convenience in use and excellent sound absorption effect, has a wider sound absorption frequency band, can be suitable for indoor walls and inner wall surfaces of vehicles, and can better replace the existing artificial porous sound absorber.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic three-dimensional structure of an embodiment of the present invention;
Fig. 2 is a graph of the calculation result of the sound absorption effect.
Wherein: 1. a rigid backing; 2. a perforated panel; 3. petal-shaped micro-channels.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a petal-shaped channel porous sound absorption structure, which is characterized in that petal-shaped sound absorption holes are formed in a perforated panel board, the directions of the holes are perpendicular to the perforated panel, and the petal shape of the sound absorption holes formed in the perforated panel board is controlled by a sine function; the invention has simple and practical structure, better middle-low frequency sound absorption performance, can effectively adjust the sound absorption bandwidth by adjusting the shape of the sound absorption holes, has light structure weight and wide application prospect.
Referring to fig. 1, the petal-shaped channel porous sound absorbing structure of the present invention comprises a rigid backing 1, a perforated panel 2 and petal-shaped micro-channels 3, wherein the perforated panel 2 is arranged on the rigid backing 1, the perforated panel 2 is uniformly or randomly provided with a plurality of petal-shaped micro-channels 3,
The radius r of the petal-shaped micro-channel 3 is a function of the polar coordinate θ, and r (θ) is:
r(θ)＝D[0.5-εsin(nθ)]
Wherein D is the average pore diameter of the petal channels; e is the amplitude of the petal radius change; n is the number of petals, namely wave number;
Relative roughness:
ε＝e/D；
preferably, in order to achieve a higher sound absorption coefficient and a wider sound absorption frequency band, the petal-shaped micro-channels 3 on the perforated panel 2 are arranged in a square manner, and the average pore diameter D of the petal-shaped micro-channels 3 is in the sub-millimeter level, and D is 0.1-1 mm.
The porosity of the petal-shaped micro-channels 3 on the perforated panel 2 is 30% -82.6%, the opening directions of the petal-shaped micro-channels 3 are perpendicular to the perforated panel 2, sound waves are difficult to enter the sound absorption structure due to the fact that the porosity is too small, and the sound absorption coefficient is reduced due to the fact that the porosity is too large; the direction of the opening is perpendicular to the perforated panel, so that sound waves can enter the sound absorption structure well when vertically incident, and meanwhile, the processing difficulty can be reduced.
The perforated panel 2 has a thickness of 2-10 cm, the perforated panel being oriented towards the sound source and the rigid backing 1 facing away from the sound source, the purpose of this being so designed that sound can enter the sound absorber and be absorbed partly or wholly.
The perforated panel 2 is made of wood board or plastic, porous fiber or porous foam material, so that the perforated panel can have a certain mechanical bearing performance under lighter conditions.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1, the sound absorber comprises a rigid backing 1 and a perforated panel 2.
The thickness of the perforated panel 2 is 3cm, and petal-shaped micro-channels 3 with the reference hole diameter D of 0.6mm are uniformly formed on the perforated panel 1 so as to enable noise to enter the sound absorber, thereby achieving the purpose of absorbing sound. The petal-shaped micro-channels 3 are distributed in a square way, and the porosity is 40%. The variation range of the roughness factor epsilon is [0,0.1], and the variation range of n is [0,12].
In this embodiment, the bandwidth of the sound absorption coefficient of the smooth round hole (epsilon=0, n arbitrary) corresponding to the sound absorber can reach 1640Hz (from 2000 to 3640 Hz) at 2680Hz up to 0.80,0.5 or more sound absorption coefficient.
Referring to fig. 2, a petal-shaped micro-channel shape is introduced, and the band width of the petal-shaped micro-channel shape 1 (epsilon=0.05, n=6) corresponding to the sound absorption coefficient of the sound absorber can reach to above 0.83,0.5 at maximum about 2670Hz (from 1950 to 3680 Hz).
The maximum sound absorption coefficient of the petal-shaped micro-channel 2 (epsilon=0.1 and n=6) corresponding to the sound absorber can reach more than 0.87,0.5 Hz around 2650Hz, and the bandwidth of the sound absorption coefficient can reach 1900Hz (from 1860 to 3760 Hz);
The maximum sound absorption coefficient of the petal-shaped micro-channel 3 (epsilon=0.1 and n=12) corresponding to the sound absorber can reach more than 0.92,0.5 at about 2590Hz, and the bandwidth of the sound absorption coefficient can reach 2250Hz (1660-3910 Hz);
In this embodiment, the maximum sound absorption coefficient of the petal-shaped micro-channel porous sound absorption structure is improved by 15% compared with that of the conventional round hole sound absorber.
In the embodiment, the band of the petal-shaped micro-channel porous sound absorbing structure with the sound absorbing coefficient larger than 0.5 is widened, and compared with the traditional round hole sound absorber, the band is widened by 37% at most.
The embodiment can achieve better sound absorption effect than the traditional round hole sound absorber with the same reference hole diameter and porosity.
In summary, according to the petal-shaped channel porous sound absorption structure, the capacity of the sound absorber for absorbing sound can be greatly improved by adjusting the hole type of the sound absorption hole on the perforated panel, the width of a sound absorption frequency band can be adjusted, and the requirements of different working conditions on sound absorption and noise reduction can be better met.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (2)
1. The utility model provides a petal-shaped channel porous sound absorption structure, a serial communication port, including rigidity back lining (1), be provided with perforation panel (2) on rigidity back lining (1), perforation panel (2) are towards sound source direction setting, rigidity back lining (1) are facing away from sound source direction setting, the thickness of perforation panel (2) is 2 ~ 10cm, a plurality of petal-shaped micro-channel (3) of interval parallel arrangement have on perforation panel (2), the shape of petal-shaped micro-channel (3) includes one or more of confirming in function r (θ), petal number n of petal-shaped micro-channel is (0,12), the variation range of relative roughness epsilon is (0,0.1), the average pore diameter D of petal-shaped micro-channel (3) is sub-millimeter level, the average pore diameter D of petal-shaped micro-channel (3) is 0.1 ~ 1mm, the porosity of petal-shaped micro-channel (3) is 30 ~ 82.6%, the trompil direction of petal-shaped micro-channel (3) is perpendicular to perforation panel (2), the radius r of petal-shaped micro-channel (3) satisfies polar θ functional relation as follows:
r(θ)＝D[0.5-εsin(nθ)]
wherein D is the average pore diameter of the petal-shaped micro-channel.
2. A petal-shaped channel porous sound absorbing structure according to claim 1, characterized in that the perforated panel (2) is made of wood board, plastic, porous fiber or porous foam material.
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| CN113362795B true CN113362795B (en) | 2024-10-29 |
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Citations (1)
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| CN109763577A (en) * | 2019-01-21 | 2019-05-17 | 南京航空航天大学 | A kind of porous plate acoustic adsorption device with rough surface modification micropore |
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| KR101574380B1 (en) * | 2012-07-05 | 2015-12-03 | (주)엘지하우시스 | Interior sound absorption sheet and sound absorption type soundproofing panel including the same |
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| CN210805210U (en) * | 2019-07-24 | 2020-06-19 | 广东美穗建材科技有限公司 | Porous sound absorption plate and sound absorption device |
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| CN109763577A (en) * | 2019-01-21 | 2019-05-17 | 南京航空航天大学 | A kind of porous plate acoustic adsorption device with rough surface modification micropore |
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