CN116052626A - Light-weight bearing wide-frequency-domain sound absorption lattice structure - Google Patents
Light-weight bearing wide-frequency-domain sound absorption lattice structure Download PDFInfo
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- CN116052626A CN116052626A CN202310049432.0A CN202310049432A CN116052626A CN 116052626 A CN116052626 A CN 116052626A CN 202310049432 A CN202310049432 A CN 202310049432A CN 116052626 A CN116052626 A CN 116052626A
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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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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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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Abstract
The invention relates to the field of noise control, in particular to a light-weight bearing broadband domain sound absorption lattice structure, which comprises a rectangular shell, wherein the rectangular shell is internally stacked with a lattice structure formed by a plurality of spherical shell structures, a plurality of internal cavities are formed between the lattice structure and the rectangular shell, a plurality of serial/parallel connection is completed among part of internal cavities through arranging a hole II on the spherical shell structure, a hole I is arranged on the rectangular shell, and the hole I and the internal cavities are combined to form a Helmholtz resonator; the stacking form of the lattice structure formed by stacking the spherical shell structures comprises a body-centered cubic form, a face-centered cubic form, a simple tetragonal form and the like; the light bearing wide-frequency-domain sound absorption lattice structures are mutually connected in parallel to realize wide-frequency-domain sound absorption; the problem that the existing sound absorption structure cannot give consideration to low-frequency broadband sound absorption and multidirectional bearing characteristics is solved.
Description
Technical Field
The invention relates to the field of noise control, in particular to a light-weight bearing wide-frequency-domain sound absorption lattice structure.
Background
With the development of various types of equipment to high-speed, light, large-scale, heavy-load and extreme operating environments, the problems of acoustic vibration damage and component failure caused by equipment operation are increasingly serious, and the structural design requirements for achieving excellent acoustic and mechanical properties are increasingly outstanding. In the existing sound absorption structure, the metamaterial structure and the porous material have good sound absorption performance at low frequency and medium and high frequency respectively, but have poor mechanical properties, so that the metamaterial structure and the porous material are limited in application in many scenes. Therefore, how to ensure the mechanical properties of the structure while realizing wide-frequency-domain sound absorption is always a difficulty in the art.
In order to improve the mechanical property of the sound absorption structure, the multifunctional lattice structure designed by carrying out acoustic and mechanical correlation on the lattice structure has the advantages of light weight and high bearing, for example, the invention CN115376479A has smaller size of a cavity structure, and the wide-frequency domain sound absorption under the low frequency is difficult to realize under the limit of the sound absorption mechanism. Meanwhile, in the existing sound absorption lattice structures, for example, the invention CN110576643A, CN111048059A and the invention CN110176224B, the structural mechanical properties of the sound absorption lattice structures have directivity, and the effective bearing capacity in all directions is difficult to ensure. Although the acoustic and mechanical multifunctional structures have greatly advanced, it is still difficult to combine the low-frequency broadband sound absorption and the multidirectional bearing characteristics, and the acoustic and mechanical multifunctional structure cannot be applied to a plurality of complex environments which are urgently needed for noise control.
Disclosure of Invention
The invention aims to provide a light bearing broadband sound absorption lattice structure, which solves the problem that the existing sound absorption structure cannot achieve both low-frequency broadband sound absorption and multidirectional bearing characteristics.
The aim of the invention is achieved by the following technical scheme:
the light bearing broadband domain sound absorption lattice structure comprises a rectangular shell, wherein a lattice structure formed by a plurality of spherical shell structures is stacked in the rectangular shell, a plurality of internal cavities are formed between the lattice structure and the rectangular shell, a plurality of series/parallel connection is completed between part of internal cavities through arranging a hole II on the spherical shell structure, a hole I is formed in the rectangular shell, and the hole I and the internal cavities are combined to form a Helmholtz resonator;
the stacking form of the lattice structure formed by stacking the spherical shell structures comprises a body-centered cubic form, a face-centered cubic form, a simple tetragonal form and the like;
the spherical shell structure can be arranged to have different diameters and thicknesses;
the position of the hole II on the spherical shell structure can be adjusted, and the hole II can be set to be different in diameter;
the holes I can be arranged in different diameters;
an extension neck can be added to the hole I;
the elongated neck can be provided in different shapes, lengths and diameters;
the Helmholtz resonators are combined through a hole II to form various series/parallel coupling sound absorption structures;
the light bearing wide-frequency-domain sound absorption lattice structures are arranged in a plurality, and the light bearing wide-frequency-domain sound absorption lattice structures are connected in parallel to realize wide-frequency-domain sound absorption;
the rectangular shell comprises an upper cover plate, a side cover plate and a lower cover plate.
The beneficial effects of the invention are as follows:
the structure integrates bearing, light weight and low frequency broadband sound absorption into a whole, combines the excellent broadband sound absorption performance of the metamaterial structure with the light weight and high bearing characteristic of the lattice structure, can effectively avoid stress concentration, ensures good multidirectional bearing capacity, and provides a new method for widening engineering application of the sound absorption structure.
Drawings
The invention will be described in further detail with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic view of a light-weight-bearing wide-frequency-domain sound-absorbing lattice structure of the present invention;
FIG. 2 is a schematic view of the internal structure of the light-weight-bearing wide-frequency-domain sound-absorbing lattice structure of the present invention;
FIG. 3 is a schematic view of the internal structure of the light-weight-bearing wide-frequency-domain sound-absorbing lattice structure of the present invention;
FIG. 4 is a schematic view of the internal structure of the light-weight load-bearing wide-frequency-domain sound-absorbing lattice structure of the present invention;
FIG. 5 is a cross-sectional view of a lightweight load-bearing wide frequency domain sound absorbing lattice structure of the present invention;
FIG. 6 is a schematic diagram of the internal cavities of the light-weight load-bearing wide-frequency-domain sound-absorbing lattice structure of the present invention, wherein the internal cavities are connected in series/parallel to form a resonance unit;
FIG. 7 is a cross-sectional view of a lightweight load-bearing wide frequency domain sound absorbing lattice structure of the present invention, with internal cavity communication schematic;
FIG. 8 is a cross-sectional view of a lightweight load-bearing wide frequency domain sound absorbing lattice structure of the present invention, with internal cavity communication schematic;
FIG. 9 is a cross-sectional view of a light-weight-bearing wide-frequency-domain sound-absorbing lattice structure of the present invention, with internal cavity communication schematic diagrams;
FIG. 10 is a cross-sectional view of a lightweight load-bearing wide frequency domain sound absorbing lattice structure of the present invention, with internal cavity communication schematic;
FIG. 11 is a schematic diagram of a broadband sound absorption structure of the light-weight-bearing broadband sound absorption lattice structure of the present invention after multiple groups of sound absorption lattice structures are connected in parallel;
FIG. 12 is a schematic view of a broadband sound absorption structure of the light-weight-bearing broadband sound absorption lattice structure of the present invention after multiple groups of sound absorption lattice structures are connected in parallel;
FIG. 13 is a schematic view of a broadband sound absorption structure of the light-weight-bearing broadband sound absorption lattice structure of the present invention after multiple groups of sound absorption lattice structures are connected in parallel;
fig. 14 is a graph of the sound absorption coefficient of a light-weight loaded wide-frequency-range sound absorption lattice structure according to the present invention as a function of the frequency of an incident sound wave.
In the figure: a spherical shell structure 1; an upper cover plate 2; a side cover plate 3; a lower cover plate 4; hole I5; hole II 6; an air column 7; the neck 8 is elongated.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 14, the structure and function of the light-weight-bearing wide-frequency-domain sound-absorbing lattice structure will be described in detail with reference to the accompanying drawings;
the light-weight bearing broadband domain sound absorption lattice structure comprises a rectangular shell, wherein the lattice structure formed by a plurality of spherical shell structures 1 is stacked in the rectangular shell;
the unit cell structure is shown in figure 1, so that the stress concentration of the structure can be avoided, the lattice structure can solve the problem of poor bearing capacity of the metamaterial structure, and a new solution is provided for realizing broadband sound absorption and a light bearing structure;
a plurality of internal cavities are formed between the lattice structure and the rectangular shell, a plurality of series/parallel connection is completed between part of internal cavities through a hole II 6 formed in the spherical shell structure 1, a hole I5 is formed in the rectangular shell, the hole I5 and the internal cavities are combined to form a Helmholtz resonator, and the sound absorption frequency range of the structure is widened based on the coupling resonance effect, so that a new solution is provided for realizing broadband sound absorption;
the combination of hole I5 and the interior cavity forms the helmholtz resonator, and the interior cavity provides the capacitive reactance for the system, and the acoustic impedance of structure is mainly adjusted to trompil I5 and hole II 6 to constitute a plurality of complete adjustable helmholtz resonators. As shown in fig. 6, when the frequency of the incident sound wave approaches the natural frequency of the resonator, the air column 7 in the opening generates strong vibration, and the sound energy is consumed due to the action of hot viscosity, so that high sound absorption effect is realized;
as shown in fig. 1, the rectangular shell comprises an upper cover plate 2, a side cover plate 3 and a lower cover plate 4, wherein four side cover plates 3 are fixedly connected to the lower cover plate 4, the upper sides of the four side cover plates 3 are fixedly connected with the upper cover plate 2, and a lattice structure formed by a plurality of spherical shell structures 1 is bonded with the upper cover plate 2, the side cover plates 3 and the lower cover plate 4 through adhesives to form a plurality of cavities;
preferably, the lattice structure is manufactured by adopting a 3D printing technology, a hole II 6 structure connected with an internal cavity is reserved in the printing process, and the surface layer of the lattice structure is ensured to be a solid structure;
the stacking form of the plurality of spherical shell structures 1 to form a lattice structure comprises 14 Bravain lattice forms such as a body-centered cube form, a face-centered cube form, a simple tetragonal form and the like, so that stress concentration caused by sharp corner positions is avoided;
the spherical shell structure 1 can be provided in different diameters and thicknesses;
the position of the hole II 6 formed in the spherical shell structure 1 can be adjusted, the hole II 6 can be set to be different in diameter, and the hole I5 can be set to be different in diameter;
the sound resistance and the acoustic resistance of the system are adjusted by setting the size of the internal cavity and the diameters of the holes I5 and II 6, so that the sound absorption peak position and the sound absorption peak height of a single Helmholtz resonator are adjusted;
an extension neck 8 can be added to the hole I5, the extension neck 8 can be set into different shapes, lengths and diameters, the upper cover plate 2 with the hole I5 and the extension neck 8 is also manufactured by adopting a 3D printing technology, and the position of the hole I5 of the upper cover plate 2 corresponds to the center of each internal cavity structure;
the extension neck 8 is added at the position of the hole I5, and the sound impedance and the sound resistance of the system are adjusted, so that the low-frequency sound absorption performance of the structure is enhanced;
the sound absorption characteristics of the structure are changed by changing the structural parameters of the spherical shell structure 1, the hole I5, the hole II 6 and the extension neck 8;
as shown in fig. 7 to 10, the helmholtz resonators are combined through a hole ii 6 to form various series/parallel coupling sound absorption structures, and different series/parallel combinations of the internal cavity structures are realized by designing various internal cavity connection modes, so that the sound absorption characteristics of the structures are adjusted;
as shown in fig. 11, the light-weight-bearing wide-frequency-domain sound-absorbing lattice structure is provided with a plurality of light-weight-bearing wide-frequency-domain sound-absorbing lattice structures with different structural parameters, which can be connected in parallel to realize wide-frequency-domain sound absorption;
as shown in fig. 11 to 13, the broadband sound absorption effect can be realized by the parallel optimization design of a plurality of groups of lattice structures, as shown in fig. 14, the combined structure realizes 92% of average high sound wave absorption in the range of 450Hz-1450Hz, and maintains the high sound absorption capacity of more than 90% in the range of 800Hz-1400Hz, so that the broadband sound absorption is successfully realized;
in conclusion, the lattice structure formed by stacking spherical shells realizes the combination of mechanical bearing and broadband sound absorption, and meanwhile, the structure can better solve the problems of stress concentration and bearing performance being constrained by directions in the traditional structure, and has high freedom of structural design, so that effective acoustic design can be carried out in a plurality of target frequency bands.
Claims (10)
1. The utility model provides a light bears wide band territory sound absorption dot matrix structure, includes rectangular shell, its characterized in that: the rectangular shell is internally stacked with a lattice structure formed by a plurality of spherical shell structures (1), a plurality of internal cavities are formed between the lattice structure and the rectangular shell, a plurality of serial/parallel connection is completed by arranging holes II (6) on the spherical shell structures (1), holes I (5) are formed in the rectangular shell, and the holes I (5) and the internal cavities are combined to form the Helmholtz resonator.
2. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: the stacking of the plurality of spherical shell structures (1) to form a stacked form of lattice structures comprises body centered cubic, face centered cubic and simple tetragonal.
3. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: the spherical shell structure (1) can be provided in different diameters and thicknesses.
4. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: the position of the hole II (6) on the spherical shell structure (1) can be adjusted, and the hole II (6) can be set to different diameters.
5. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: the holes I (5) can be arranged with different diameters.
6. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: an extension neck (8) can be added to the hole I (5).
7. The lightweight broadband sound absorbing lattice structure of claim 6, wherein: the elongated neck (8) can be provided in different shapes, lengths and diameters.
8. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: and various series/parallel coupling sound absorption structures are formed among the Helmholtz resonators through hole II (6) combination.
9. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: the light bearing wide-frequency-domain sound absorption lattice structures are arranged in a plurality, and the light bearing wide-frequency-domain sound absorption lattice structures are mutually connected in parallel to realize wide-frequency-domain sound absorption.
10. The lightweight broadband-loaded sound absorbing lattice structure of claim 1, wherein: the rectangular shell comprises an upper cover plate (2), a side cover plate (3) and a lower cover plate (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310049432.0A CN116052626A (en) | 2023-02-01 | 2023-02-01 | Light-weight bearing wide-frequency-domain sound absorption lattice structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310049432.0A CN116052626A (en) | 2023-02-01 | 2023-02-01 | Light-weight bearing wide-frequency-domain sound absorption lattice structure |
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| CN116052626A true CN116052626A (en) | 2023-05-02 |
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| CN202310049432.0A Pending CN116052626A (en) | 2023-02-01 | 2023-02-01 | Light-weight bearing wide-frequency-domain sound absorption lattice structure |
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