CN219916701U - Sound absorption and acoustic energy enhancement device based on bound state in continuum - Google Patents
Sound absorption and acoustic energy enhancement device based on bound state in continuum Download PDFInfo
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- CN219916701U CN219916701U CN202321305430.5U CN202321305430U CN219916701U CN 219916701 U CN219916701 U CN 219916701U CN 202321305430 U CN202321305430 U CN 202321305430U CN 219916701 U CN219916701 U CN 219916701U
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Abstract
The utility model relates to a sound absorption and sound energy enhancement device based on a bound state in a continuum, which comprises a first resonant cavity and a second resonant cavity which are mutually nested, wherein the second resonant cavity is positioned in the first resonant cavity, the first resonant cavity and the second resonant cavity are in parallel connection, and the depth and the section side length of the first resonant cavity and the section side length of the second resonant cavity are different. Compared with the prior art, the utility model has the advantages of obviously increased sound pressure amplification factor, good robustness, simple and easy processing of the whole configuration and is expected to be applied to the design of a multifunctional acoustic device.
Description
Technical Field
The utility model relates to the field of noise control, in particular to a sound absorption and sound energy enhancement device based on a bound state in a continuum.
Background
The bound state in the continuum is a state in which the acoustic wave is completely confined without radiation, and the radiation wave is within the continuum. For two resonant cavities at the same position, the control of the incident sound wave can be realized by adjusting the radiation loss of the cavity. However, most of the current researches aim at coupling structures with the same cross section, such as a sound energy collector adopting phonon crystals and electromechanical Helmholtz resonators disclosed in the utility model with the publication number of CN105281599A, and the sound pressure amplification coefficient in the cavity of the existing scheme is smaller, so that the sound energy density in the cavity is lower, which is not beneficial to preparing a dual-function device with sound absorption and sound energy collection.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide the sound absorption and sound energy enhancement device based on the constraint state in the continuum, which has the advantages of simpler structure, good low-frequency sound absorption performance, strong robustness and simple and easy processing of the whole configuration.
The aim of the utility model can be achieved by the following technical scheme:
the utility model provides a sound absorption and sound energy reinforcing means based on constraint state in the continuum, includes first resonant cavity and the second resonant cavity of mutually nested setting, the second resonant cavity is located the inside of first resonant cavity, first resonant cavity and second resonant cavity are parallel connection, the cavity degree of depth and the cross-section side length of first resonant cavity and second resonant cavity all have different.
Further, the first resonant cavity and the second resonant cavity are hollow columnar structures with circular or polygonal sections.
Further, the cross sections of the first resonant cavity and the second resonant cavity are regular quadrangles.
Further, the device is a sound absorption device at 481Hz, and the side length and the depth of the resonant cavity of the first resonant cavity are 102mm and 120mm respectively; the side length and the depth of the resonant cavity of the second resonant cavity are 23mm and 172.4mm respectively.
Further, the second resonant cavity is located at the center of the first resonant cavity.
Further, the cavity depth of the second resonant cavity is greater than the cavity depth of the first resonant cavity.
Further, the cross-sectional side length of the second resonant cavity is smaller than the cross-sectional side length of the first resonant cavity.
Further, the tops of the first resonant cavity and the second resonant cavity are located on the same plane.
Further, the first resonant cavity and the second resonant cavity are resonant cavities with the cavity depth being one quarter of the working wavelength.
Further, the extending directions of the first resonant cavity and the second resonant cavity are the same.
Compared with the prior art, the utility model has the following advantages:
(1) The utility model is designed based on the constraint state theory in the continuum, and can restrict the incident sound wave in the cavity at a specific frequency by the coupling action of the two nested cavities, so that the structure has no reflected wave, the sound energy density in the cavity is greatly improved, and the higher sound absorption and sound energy enhancement effects can be realized.
(2) Compared with the traditional sound absorption structure, the sound pressure amplification factor is obviously increased, the sound absorption structure has good robustness, the whole structure is simple and easy to process, and the sound absorption structure is expected to be applied to the design of a multifunctional acoustic device.
(3) According to the utility model, the working frequency can be changed by adjusting the structural parameters, and the structural sound absorption performance can be optimized by changing the height difference.
Drawings
FIG. 1 is a schematic diagram of a sound absorption and enhancement device based on a bound state in a continuum according to an embodiment of the present utility model;
FIG. 2 is a schematic cross-sectional view of a sound absorption and enhancement device based on a bound state in a continuum according to an embodiment of the utility model;
FIG. 3 is a graph of sound absorption results of a sound absorption and sound energy enhancement device based on a bound state in a continuum, wherein a solid line is a simulation result, a circle is an experimental result, a simulated sound absorption coefficient at 481.1Hz is 0.9999, and an experimental sound absorption coefficient is 0.9878;
FIG. 4 is a schematic view showing acoustic resistance distribution of a sound absorption and enhancement device based on a bound state in a continuum according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram showing sound resistance distribution of a sound absorption and sound energy enhancement device based on a bound state in a continuum according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram showing a distribution of a ratio of sound pressure inside a small cavity to an incident sound pressure in a sound absorption and sound energy enhancement device based on a bound state in a continuum according to an embodiment of the present utility model;
in the figure, 1, a first resonant cavity, 2 and a second resonant cavity.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model 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 utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model.
It should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Example 1
As shown in fig. 1, this embodiment provides a sound absorption and acoustic energy enhancement device based on a bound state in a continuum, which includes a first resonant cavity 1 and a second resonant cavity 2 that are nested with each other, the second resonant cavity 2 is located inside the first resonant cavity 1, the first resonant cavity 1 and the second resonant cavity 2 are in a parallel relationship in terms of acoustics, and the cavity depths and the section side lengths of the first resonant cavity 1 and the second resonant cavity 2 are different.
Specifically, the first resonant cavity 1 and the second resonant cavity 2 are hollow columnar structures with circular, triangular, quadrilateral or other polygonal cross sections, and in this embodiment, a regular quadrilateral cross section is adopted.
The second resonator 2 is located in the centre of the first resonator 1.
The cavity depth of the second resonator 2 is greater than the cavity depth of the first resonator 1.
The second resonator 2 has a smaller cross-sectional side length than the first resonator 1.
The tops of the first and second resonators 1 and 2 are located on the same plane.
The first resonator 1 and the second resonator 2 have the same extension direction, and in this embodiment extend in the vertical direction.
The first resonant cavity 1 and the second resonant cavity 2 are resonant cavities with the cavity depth being one quarter of the operating wavelength. The two coupled resonators can bind incident sound waves inside the cavity at specific frequencies, thus achieving perfect sound absorption. The structure can effectively restrict low-frequency sound waves, the working frequency can be changed by adjusting structural parameters, sound waves with specific frequencies are restricted in the cavity, and perfect sound absorption is achieved. The device has simple design structure and easy processing.
Preferably, the quadrangle is a regular quadrangle. In this embodiment, as shown in FIG. 2, the device is a sound absorbing device at 481Hz, and the side length w of the first resonant cavity 1 is 1 And cavity depth l 1 102mm and 120mm respectively; side length w of second resonator 2 2 And cavity depth l 2 23mm and 172.4mm respectively.
In this embodiment, simulation tests are performed on the sound absorption and acoustic energy enhancement device based on the bound state in the continuum, as shown in fig. 3, the solid line is the sound absorption simulation result of the device, the circle is the experimental result, the solid line is the simulation result, the circle is the experimental result, the simulated sound absorption coefficient at 481.1Hz is 0.9999, and the experimental sound absorption coefficient is 0.9878; as shown in fig. 4, is the acoustic resistance distribution of the device; as shown in fig. 5, the acoustic reactance distribution of the device; as shown in fig. 6, the ratio of the sound pressure inside the small cavity to the incident sound pressure in the device; therefore, the device of the scheme gathers the incident sound energy in the cavity at the specific frequency, so that the structure has no reflected wave, the sound energy density in the cavity is greatly improved, and the higher sound absorption and sound energy enhancement effects can be realized.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a sound absorption and sound energy reinforcing means based on constraint state in the continuum, its characterized in that includes first resonant cavity (1) and second resonant cavity (2) of mutually nested setting, second resonant cavity (2) are located the inside of first resonant cavity (1), first resonant cavity (1) and second resonant cavity (2) are parallel connection, the cavity degree of depth and the cross-section side length of first resonant cavity (1) and second resonant cavity (2) all have the difference.
2. The sound absorption and energy enhancement device based on the constrained state in a continuum according to claim 1, characterized in that said first resonant cavity (1) and said second resonant cavity (2) are hollow cylindrical structures with circular or polygonal cross section.
3. Sound absorption and energy enhancement device based on the bound state in a continuum according to claim 2, characterized in that the cross section of the first and second resonant cavities (1, 2) is regular quadrangle.
4. A sound absorption and energy enhancement device based on a bound state in a continuum according to claim 3, characterized in that said device is a sound absorption device with an operating frequency at 481Hz, the side length and depth of the first resonant cavity (1) being 102mm and 120mm, respectively; the side length and the depth of the resonant cavity of the second resonant cavity (2) are 23mm and 172.4mm respectively.
5. Sound absorption and energy enhancement device based on a bound state in a continuum according to claim 1, characterized in that said second resonator (2) is located in the centre of said first resonator (1).
6. Sound absorption and energy enhancement device based on a bound state in a continuum according to claim 1, characterized in that the cavity depth of the second resonator (2) is larger than the cavity depth of the first resonator (1).
7. Sound absorption and energy enhancement device based on a bound state in a continuum according to claim 1, characterized in that the cross-sectional side length of the second resonator (2) is smaller than the cross-sectional side length of the first resonator (1).
8. Sound absorption and energy enhancement device based on the bound state in a continuum according to claim 1, characterized in that the top of the first and second resonator cavities (1, 2) are located on the same plane.
9. The sound absorption and energy enhancement device based on the bound state in a continuum according to claim 1, characterized in that the first and second resonant cavities (1, 2) are each resonant cavities having a cavity depth of one quarter of the operating wavelength.
10. Sound absorption and energy enhancement device based on a bound state in a continuum according to claim 1, characterized in that the first and second resonator cavities (1, 2) extend in the same direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321305430.5U CN219916701U (en) | 2023-05-26 | 2023-05-26 | Sound absorption and acoustic energy enhancement device based on bound state in continuum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321305430.5U CN219916701U (en) | 2023-05-26 | 2023-05-26 | Sound absorption and acoustic energy enhancement device based on bound state in continuum |
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| CN219916701U true CN219916701U (en) | 2023-10-27 |
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- 2023-05-26 CN CN202321305430.5U patent/CN219916701U/en active Active
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