Acoustic diffuser based on acoustic metasurface
By using parallel, series, or series-parallel structures of acoustic metasurface diffusers, the problem of excessive size of traditional diffusers in the low-frequency range is solved, achieving a thin and wide-bandwidth acoustic diffusion effect that meets the needs of modern architectural design.
Patent Information
- Application Number
- CN202423314830.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Traditional Schroder diffusers are too large in size in the low-frequency range due to their design principles and material properties, which affects their practical application performance.
An acoustic diffuser based on an acoustic metasurface is used. By using parallel, series, or series-parallel composite structures of diffuser subunits, the acoustic reflection phase is controlled to achieve a thin and wide-bandwidth acoustic diffusion effect.
It achieves a lightweight and thin structure, flexible use, and adjustable operating frequency band, from below 50Hz in the low frequency range to above 4000Hz in the high frequency range, to meet the needs of modern architectural design and improve the uniformity of the sound field.
Smart Images
Figure CN223757263U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to acoustics super surface technical field especially relates to a kind of based on acoustics super surface acoustic diffuser. BACKGROUND
[0002] Acoustic Diffusers is a tool for processing indoor sound reflection, can be scattered into multiple directions Propagation of small amplitude sound wave, i.e. by scattering sound wave to reduce harmful reflection and standing wave phenomenon, so as to improve the sound field uniformity in room.
[0003] Traditional Schroeder diffuser is widely used in architectural acoustics due to its design principle and material characteristics, but due to its working wavelength and thickness is positively correlated, so that its size is too large in low frequency range, affecting its practical application effect. INVENTION CONTENTS
[0004] In view of the deficiencies of the prior art, the utility model provides a kind of wide frequency, light and thin and flexible based on acoustics super surface acoustic diffuser.
[0005] To achieve the above object, the utility model is realized by the following technical scheme.
[0006] The application provides an acoustic diffuser based on acoustic super surface, comprising at least one diffusion module, at least one diffusion subunit is provided on the diffusion module;
[0007] The diffusion subunit includes a first cavity, a second cavity, a third cavity and a fourth cavity provided on the diffusion module in the Y-axis direction;
[0008] The third cavity is arranged between the first cavity and the fourth cavity and is communicated with the first cavity and the fourth cavity in the X-axis direction, the third cavity is provided with two, the two third cavities are symmetrically arranged about the second cavity and are respectively communicated with the first cavity, and one side of the fourth cavity in the Z-axis direction is communicated with the outside of the diffusion module;
[0009] Wherein, when the diffusion subunit on the diffusion module is provided with multiple, multiple diffusion subunits constitute parallel structure, series structure or series-parallel composite structure.
[0010] Further limitation, the above-mentioned acoustic diffuser based on acoustic super surface, wherein, the diffusion module is provided with multiple diffusion subunits, and multiple diffusion subunits constitute parallel structure;
[0011] Wherein, multiple diffusion subunits are arranged in linear array in the Z-axis direction, and the fourth cavities are communicated with each other in the Z-axis direction.
[0012] Further, in the acoustic diffuser based on the acoustic metasurface, the diffusion sub-units are arranged in a parallel structure.
[0013] The diffusion sub-units are arranged in a linear array along the Z-axis direction.
[0014] Further, in the acoustic diffuser based on the acoustic metasurface, the diffusion sub-units are arranged in a series structure.
[0015] One of the diffusion sub-units is a first-level diffusion unit, and the other diffusion sub-units are second-level diffusion units.
[0016] The second-level diffusion units are arranged in a linear array along the Z-axis direction.
[0017] Further, in the acoustic diffuser based on the acoustic metasurface, the diffusion sub-units are arranged in a series structure.
[0018] The second-level diffusion units are arranged in a linear array along the Z-axis direction.
[0019] Further, in the acoustic diffuser based on the acoustic metasurface, the diffusion sub-units are arranged in a series structure.
[0020] One of the diffusion sub-units is a first-level diffusion unit, and the other diffusion sub-units are second-level diffusion units.
[0021] The second-level diffusion units are arranged in a linear array along the Z-axis direction.
[0022] Further, in the acoustic diffuser based on the acoustic metasurface, the diffusion sub-units are arranged in a series-parallel composite structure.
[0023] The second-level diffusion units are arranged in a linear array along the Z-axis direction.
[0024] The second cavity of the secondary diffusion unit is communicated with the first cavity of the corresponding position primary diffusion unit in the Y-axis direction.
[0025] Further limitation, the above-mentioned one kind based on acoustic super surface's acoustic diffusion body, wherein, six diffusion subunits are arranged on the diffusion module, and the six diffusion subunits form a series-parallel composite structure.
[0026] Two of the diffusion subunits are arranged as primary diffusion units and linearly arranged in the Z-axis direction, and the fourth cavities of the two primary diffusion units are communicated with each other in the Z-axis direction.
[0027] Two diffusion subunits are arranged in the first cavities of the two primary diffusion units, respectively, and the diffusion subunits in the first cavities of the primary diffusion units are arranged as secondary diffusion units.
[0028] The plurality of secondary diffusion units are linearly arranged in the Z-axis direction, the secondary diffusion units omit the fourth cavities, and the second cavities are communicated with the first cavities of the corresponding position primary diffusion units in the Y-axis direction.
[0029] Further limitation, the above-mentioned one kind based on acoustic super surface's acoustic diffusion body, wherein, a plurality of diffusion modules are arranged, and the plurality of diffusion modules are fixedly connected and respectively arranged with at least one diffusion subunit.
[0030] The utility model at least has following beneficial effects:
[0031] The diffusion subunit is composed of, the structure is light and thin, uses nimblely, adapts modern architectural design demand, not only convenient to install, uses, moreover can carry out modular processing and assembly, easily adjusts, construction difficulty is low, can be applicable to multiple acoustic occasions, and each diffusion subunit contains multiple cavity regions, and the resonance structure is excited through the series connection or parallel connection mode of multiple diffusion subunits, the sound reflection phase is regulated, so that the working frequency band can be optimized according to actual demand, the low frequency band can be adjusted to below 50Hz, and the high frequency band can reach above 4000Hz, the working frequency band is wide, and the acoustic performance is strong, so that the acoustic requirements in different environments can be met. BRIEF DESCRIPTION OF DRAWINGS
[0032] Figure 1 It is the structure diagram of "diffusion subunit" in the acoustic diffusion body based on acoustic super surface of the embodiment of the application;
[0033] Figure 2 It is the structure diagram of "diffusion subunit" in the acoustic diffusion body based on acoustic super surface of the embodiment of the application;
[0034] Figure 3A schematic diagram of a parallel structure of multiple "diffusion sub-units" in an acoustic diffuser based on an acoustic metasurface according to an embodiment of the present application;
[0035] Figure 4 A schematic diagram of a parallel structure of multiple "diffusion sub-units" in an acoustic diffuser based on an acoustic metasurface according to an embodiment of the present application;
[0036] Figure 5 A schematic diagram of a series structure of multiple "diffusion sub-units" in an acoustic diffuser based on an acoustic metasurface according to an embodiment of the present application;
[0037] Figure 6 A schematic diagram of a series-parallel composite structure of multiple "diffusion sub-units" in an acoustic diffuser based on an acoustic metasurface according to an embodiment of the present application;
[0038] Figure 7 A schematic diagram of the structure of an acoustic diffuser based on an acoustic metasurface according to an embodiment of the present application;
[0039] Figure 8 A schematic diagram of the reflection phase diagram of an acoustic diffuser based on an acoustic metasurface according to an embodiment of the present application;
[0040] Figure 9 A comparison diagram of the diffusion coefficient of an acoustic diffuser based on an acoustic metasurface and a flat plate of the same size under normal incidence according to an embodiment of the present application;
[0041] Figure 10 A comparison diagram of the diffusion coefficient of an acoustic diffuser based on an acoustic metasurface and a flat plate of the same size under 60° oblique incidence according to an embodiment of the present application;
[0042] Figure 11 A comparison diagram of the sound pressure level distribution of an acoustic diffuser based on an acoustic metasurface and a flat plate at "500Hz" according to an embodiment of the present application;
[0043] Figure 12 A comparison diagram of the diffusion coefficient of an acoustic diffuser based on an acoustic metasurface and a flat plate under normal incidence according to an embodiment of the present application.
[0044] Reference signs
[0045] Diffusion module-100, first cavity-210, second cavity-220, third cavity-230, fourth cavity-240. DETAILED DESCRIPTION
[0046] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.
[0047] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0048] The acoustic diffuser based on acoustic metasurface provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.
[0049] Example 1
[0050] like Figures 1 to 7 As shown, this application provides an acoustic diffuser based on an acoustic metasurface, including at least one diffusion module 100, and at least one diffusion subunit is provided on the diffusion module 100.
[0051] like Figure 1 , Figure 2 As shown, the diffusion subunit includes a first cavity 210, a second cavity 220, a third cavity 230, and a fourth cavity 240 that are disposed through the diffusion module 100 in the Y-axis direction.
[0052] The third cavity 230 is disposed between the first cavity 210 and the fourth cavity 240 and is connected to the first cavity 210 and the fourth cavity 240 respectively in the X-axis direction. There are two third cavities 230, which are symmetrically arranged about the second cavity 220 and are connected to the first cavity 210 respectively. The fourth cavity 240 is connected to the outside of the diffusion module 100 on one side in the Z-axis direction.
[0053] When multiple diffusion sub-units are provided on the diffusion module 100, the multiple diffusion sub-units form a parallel structure, a series structure, or a series-parallel composite structure.
[0054] like Figure 9 As shown in the figure, it compares the diffusion coefficients of a diffuser consisting of 5 diffusion modules (each diffusion module contains a diffusion sub-unit) with those of a flat plate of the same size under normal incidence. The figure shows that after the operating frequency exceeds 350Hz, the diffusion coefficient of the diffuser is greater than that of the flat plate of the same size, and the attenuation is not significant. The diffusion coefficient can still be kept stable as the operating frequency increases.
[0055] Need to explain, compared with the traditional Schroeder diffuser, the utility model in 500Hz working frequency is only 1 / 10 of the traditional structure, and can significantly reduce the size problem of low frequency band of traditional structure.
[0056] As Figure 10 shown, it represents the diffusion coefficient comparison of the diffusion body composed of 5 diffusion modules (each diffusion module contains a diffusion subunit) and the same size panel under 60° oblique incidence, from the figure, it can be seen that, compared with the normal incidence working environment, after the working frequency exceeds 350Hz, the diffusion coefficient of the diffusion body is more stable than that of the same size panel, still maintains the wideband working performance, and the performance is excellent, effectively improves the uniformity of the sound field, and is convenient for practical application.
[0057] As Figure 11 shown, it represents the sound pressure level distribution comparison of the diffusion body and the same size panel under 500Hz working frequency, from the figure, it can be seen that, compared with the same size panel, the sound pressure level distribution of the reflected sound field of the diffusion body is more uniform, so as to ensure the sound reinforcement effect.
[0058] In the embodiment of the application, the above-mentioned acoustic diffusion body based on acoustic metasurface is composed of diffusion subunits, which is light and thin, flexible to use, and meets the needs of modern architectural design. It is not only convenient to install and use, but also can be modularly processed and assembled, easy to adjust, low in construction difficulty, and can be applied to various acoustic occasions. At the same time, each diffusion subunit contains multiple cavity regions, and the resonance structure is excited in series or parallel mode to control the sound reflection phase, so that the working frequency band can be optimized according to actual needs, the low frequency band can be adjusted to below 50Hz, and the high frequency band can reach above 4000Hz. The working frequency band is wide, the acoustic performance is strong, and the acoustic requirements in different environments can be met.
[0059] In a preferred embodiment, as Figure 3 , Figure 4 shown, the diffusion module 100 is provided with a plurality of diffusion subunits, and the plurality of diffusion subunits form a parallel structure.
[0060] Among them, the plurality of diffusion subunits are arranged in linear array in the Z-axis direction, and the fourth cavities 240 are communicated with each other in the Z-axis direction.
[0061] It can be understood that the more the number of parallel diffusion subunits, the larger the volume, and the better the acoustic performance. On the contrary, it means that it is lighter and thinner. The specific setting form is based on the use demand, which is not described here.
[0062] In a preferred embodiment, as Figure 3 , Figure 4As shown, the diffusion sub-units are specifically provided as three, and the three diffusion sub-units form a parallel structure.
[0063] The three diffusion sub-units are linearly arranged in the Z-axis direction, and the fourth cavities 240 are communicated with each other in the Z-axis direction.
[0064] In a preferred embodiment, as shown in Figure 5 As shown, the diffusion module 100 is provided with a plurality of diffusion sub-units, and the plurality of diffusion sub-units form a series structure.
[0065] One of the diffusion sub-units is used as a first diffusion unit, and the remaining diffusion sub-units are used as second diffusion units, and the second diffusion units are arranged in the first cavities 210 of the first diffusion units.
[0066] The second diffusion units omit the fourth cavities 240, and the second cavities 220 are communicated with the first cavities 210 of the first diffusion units in the Y-axis direction.
[0067] As shown in Figure 8 The reflection phase contrast of a single diffusion sub-unit and the series structure of the first diffusion units and the second diffusion units is shown in the figure, and it can be found from the figure that the series structure of the first diffusion units and the second diffusion units can obtain higher frequency adjustment capability and has a wider working frequency band.
[0068] It can be understood that a diffusion sub-unit can be further arranged in the first cavities 210 of the second diffusion units as a third diffusion unit, and the more the series number of the diffusion units, the stronger the frequency band performance, which will not be described here.
[0069] In a preferred embodiment, as shown in Figure 5 The first cavities 210 of the first diffusion units are provided with a plurality of second diffusion units.
[0070] The plurality of second diffusion units are linearly arranged in the Z-axis direction.
[0071] In a preferred embodiment, as shown in Figure 5 The diffusion module 100 is provided with three diffusion sub-units, and the three diffusion sub-units form a series structure.
[0072] One of the diffusion sub-units is used as a first diffusion unit, and the remaining two diffusion sub-units are used as second diffusion units, and the second diffusion units are arranged in the first cavities 210 of the first diffusion units.
[0073] The second diffusion units omit the fourth cavities 240, and the second cavities 220 are communicated with the first cavities 210 of the first diffusion units in the Y-axis direction.
[0074] In a preferred embodiment, asFigure 6 As shown in the figure, the diffusion module 100 is provided with a plurality of diffusion sub-units, and the plurality of diffusion sub-units form a series-parallel composite structure.
[0075] At least one diffusion sub-unit is used as a secondary diffusion unit, a plurality of diffusion sub-units are used as primary diffusion units and are arranged in a linear array in the Z-axis direction, and the fourth cavities 240 of the plurality of primary diffusion units are communicated with each other in the Z-axis direction.
[0076] Among them, the first cavity 210 of at least one primary diffusion unit is provided with a secondary diffusion unit, the secondary diffusion unit omits the fourth cavity 240, and the second cavity 220 is communicated with the first cavity 210 of the corresponding position primary diffusion unit in the Y-axis direction.
[0077] In a preferred embodiment, as shown in the figure, Figure 6 As shown in the figure, the diffusion module 100 is provided with six diffusion sub-units, and the six diffusion sub-units form a series-parallel composite structure.
[0078] Among them, two diffusion sub-units are used as primary diffusion units and are arranged in a linear array in the Z-axis direction, and the fourth cavities 240 of the two primary diffusion units are communicated with each other in the Z-axis direction.
[0079] The first cavities 210 of the two primary diffusion units are respectively provided with two diffusion sub-units, and the diffusion sub-units in the first cavities 210 of the primary diffusion units are used as secondary diffusion units.
[0080] Among them, a plurality of secondary diffusion units are arranged in a linear array in the Z-axis direction, the secondary diffusion units omit the fourth cavities 240, and the second cavities 220 are communicated with the first cavities 210 of the corresponding position primary diffusion unit in the Y-axis direction.
[0081] It can be understood that the two diffusion sub-units are used as primary diffusion units and form a two-layer parallel structure in parallel, and two secondary diffusion units are connected in series in each layer of primary diffusion units.
[0082] As shown in the figure, Figure 12 The diffusion coefficient comparison of the diffusion body composed of the double-layer diffusion module composed of two primary diffusion units in parallel, the diffusion body composed of a single-layer diffusion module composed of one primary diffusion unit, and the same size flat plate under normal incidence can be found that the double-layer diffusion body can further improve the overall diffusion performance.
[0083] In a preferred embodiment, as shown in the figure, Figure 7 As shown in the figure, the diffusion module 100 is provided with a plurality of, and the plurality of diffusion modules 100 are fixedly connected and are respectively provided with at least one diffusion sub-unit.
[0084] In a preferred embodiment, the solid material of the diffusion module 100 is specifically configured as wood or metal, and the filling material in the first cavity 210, the second cavity 220, the third cavity 230, and the fourth cavity 240 is air.
[0085] It can be understood that the solid material of the diffusion module 100 is not limited to the above, and is specifically configured based on different architectural styles and environmental requirements, as long as the overall structure of the diffusion module 100 can be ensured, and details are not repeated here.
[0086] Embodiment 2
[0087] The embodiment of the present application provides a design method suitable for the acoustic diffusion body based on the acoustic super surface in the above-mentioned embodiment 1, which comprises the following steps:
[0088] In step S1, the equivalent dynamic mass density and the bulk modulus of the cavity structure in the acoustic diffusion body are obtained, and the equivalent impedance matrix of the cavity structure is obtained based on the equivalent dynamic mass density and the bulk modulus;
[0089] In step S2, the theoretical model results of the series and parallel connection of the plurality of cavity structures are obtained based on the equivalent impedance matrix of the cavity structure.
[0090] In step S3, the acoustic reflection phase of the diffusion module is obtained based on the theoretical model results of the series and parallel connection of the plurality of cavity structures.
[0091] In step S4, the structure parameters of the diffusion subunit are adjusted based on the acoustic reflection phase result of the diffusion module, and iterative optimization is performed to achieve the expected acoustic reflection phase result.
[0092] The structure parameters of the acoustic diffusion body include the number, the connection structure, and the cavity size of the diffusion subunit.
[0093] It can be understood that the connection structure of the diffusion subunit specifically represents the number of parallel connection structure layers and the number of series connection structure levels of the plurality of diffusion subunits, and the number and size of the cavity of the diffusion subunit can be adjusted to achieve diversified selection of working frequency bands and meet the needs of different acoustic environments.
[0094] In the embodiment of the present application, the above-mentioned design method is adopted, the structure of the diffusion subunit is simulated by acoustic finite elements, the diffusion subunit structure suitable for different frequency bands and wide frequency bands is obtained, better wide frequency adaptability can be achieved, the sound reinforcement effect is greatly enhanced, and the uniformity of the sound field is effectively improved.
[0095] In a preferred embodiment, in step S1, the equivalent impedance matrix of the cavity structure based on the equivalent dynamic mass density and the bulk modulus is specifically configured as:
[0096] The wave number and characteristic impedance of the cavity structure are obtained based on the equivalent dynamic mass density and bulk modulus, and the equivalent impedance matrix of the cavity structure is obtained based on the wave number and characteristic impedance of the cavity structure.
[0097] In a preferred embodiment, in step S1, the method for obtaining the equivalent dynamic mass density and bulk modulus of the cavity structure is as follows:
[0098] The equivalent dynamic mass density is:
[0099] The bulk modulus is:
[0100] wherein, i is the imaginary unit, w is the cavity scale factor, ω is the angular frequency, ρ0 is the air density, η0 is the dynamic viscosity, K0 is the air bulk modulus, P r is the Prandtl number, and γ is the specific heat ratio of air.
[0101] It can be understood that each cavity region in the diffusion sub-unit has a different size factor w, and multiple diffusion sub-units can further form a series structure, a parallel structure, or a series-parallel composite structure, so as to obtain more excellent acoustic performance.
[0102] In a preferred embodiment, in step S1, the method for obtaining the wave number and characteristic impedance of the cavity structure is as follows:
[0103] The wave number is: The characteristic impedance is:
[0104] wherein, L is the length of the cavity.
[0105] In a preferred embodiment, in step S1, the method for obtaining the equivalent impedance matrix of the cavity structure is as follows:
[0106]
[0107] In a preferred embodiment, in step S2, the method for obtaining the equivalent matrix of the multiple-cavity-structure series theoretical model result is as follows:
[0108]
[0109] In a preferred embodiment, in step S2, the method for obtaining the equivalent matrix of the multiple-cavity-structure parallel theoretical model result is as follows:
[0110]
[0111] wherein, Z t1 = M t1 (1,1) / M t1(2,1); Z t1 = M t2 (1,1) / M t2 (2,1).
[0112] In a preferred embodiment, in step S3, the method for obtaining the sound reflection phase of the diffusion sub-unit is:
[0113] φ = arg(R);
[0114] wherein the sound reflection coefficient of the diffusion sub-unit is: The impedance of the diffusion sub-unit is:
[0115] wherein Z0 is the sound impedance of air.
[0116] In the embodiments of the present application, the above design method is adopted, the impedance transfer method is used to obtain the overall impedance of the series and parallel structure, so as to obtain the sound wave reflection phase parameter of the overall structure, and then the adjustment of the diffusion coefficient in the diffusion sound field is realized.
[0117] In a preferred embodiment, in step S4, the cavity sizes of the first cavity 210, the second cavity 220, the fourth cavity 240 and the two third cavities 230 in the diffusion sub-unit are determined based on the sound reflection phase of the diffusion sub-unit.
[0118] In a preferred embodiment, in step S4, the quadratic residue sequence QRD algorithm is used, and five diffusion sub-units are used to form a diffusion body, the sound reflection phases of each diffusion sub-unit are 0°, 72°, 288°, 288° and 72° respectively, the structure parameters of the diffusion sub-unit are adjusted based on the parameters to obtain the required equivalent dynamic mass density and bulk modulus, and then the iteration optimization is performed to achieve the expected sound reflection phase result.
[0119] In a preferred embodiment, in step S4, the sound reflection phase of the diffusion sub-unit is verified by simulation.
[0120] In order to explain the diffusion performance of the diffusion body composed of diffusion sub-units, the diffusion coefficient calculation is performed on the diffusion sound field, and the calculation expression is:
[0121]
[0122] wherein L i is the sound pressure level received by the ith microphone in the diffusion sound field, and there are N microphones on the semicircular arc.
[0123] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the method and apparatus of the present application can be carried out by someone other than the person named in the independent claims, and that the scope of the independent claims is not limited to the person named in the independent claims. In addition, it should be noted that the scope of the method and apparatus of the present application is not limited to performing the functions in the order discussed or illustrated, but can also include performing the functions in a substantially simultaneous manner or in a reverse order, for example, the described method can be performed in an order different from that described, and various steps can be added, omitted, or combined, in addition, features described with reference to certain examples can be combined in other examples.
[0124] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, which are merely illustrative and not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.
Claims
1. An acoustic diffuser based on an acoustic metasurface, characterized in that, The diffusion module comprises at least one diffusion subunit; The diffusion subunit comprises a first cavity, a second cavity, a third cavity and a fourth cavity which are arranged in the Y-axis direction and pass through the diffusion module; The third cavity is arranged between the first cavity and the fourth cavity and is in communication with the first cavity and the fourth cavity in the X-axis direction, and the third cavity is provided with two third cavities which are symmetrically arranged with respect to the second cavity and are in communication with the first cavity, and the fourth cavity is in communication with the outside of the diffusion module on one side in the Z-axis direction; When the diffusion subunits are provided on the diffusion module, the diffusion subunits are arranged in parallel, in series or in series-parallel combination.
2. The acoustic diffuser based on acoustic metasurface according to claim 1, characterized in that, The diffusion module is provided with a plurality of diffusion subunits, and the diffusion subunits are arranged in parallel; Wherein, the diffusion subunits are arranged in linear array in the Z-axis direction, and the fourth cavities are in communication with each other in the Z-axis direction.
3. The acoustic diffuser based on acoustic metasurface according to claim 2, characterized in that, The diffusion subunit is specifically provided with three diffusion subunits, and the three diffusion subunits are arranged in parallel; Wherein, the diffusion subunits are arranged in linear array in the Z-axis direction, and the fourth cavities are in communication with each other in the Z-axis direction.
4. The acoustic diffuser based on acoustic metasurface according to claim 1, characterized in that, The diffusion module is provided with a plurality of diffusion subunits, and the diffusion subunits are arranged in series; One of the diffusion subunits is used as a first-stage diffusion unit, and the remaining diffusion subunits are used as second-stage diffusion units, and the second-stage diffusion units are arranged in the first cavity of the first-stage diffusion unit; The second-stage diffusion unit omits the fourth cavity, and the second cavity is in communication with the first cavity of the first-stage diffusion unit in the Y-axis direction.
5. The acoustic diffuser based on acoustic metasurface according to claim 4, characterized in that, The first cavity of the first-stage diffusion unit is provided with a plurality of second-stage diffusion units; The second-stage diffusion units are arranged in linear array in the Z-axis direction.
6. The acoustic diffuser based on acoustic metasurface according to claim 4 or 5, characterized in that, The diffusion module is provided with three diffusion subunits, and the three diffusion subunits are arranged in series; One of the diffusion subunits is used as a first-stage diffusion unit, and the remaining two diffusion subunits are used as second-stage diffusion units, and the second-stage diffusion units are arranged in the first cavity of the first-stage diffusion unit; The second-stage diffusion unit omits the fourth cavity, and the second cavity is in communication with the first cavity of the first-stage diffusion unit in the Y-axis direction.
7. The acoustic diffuser based on acoustic metasurface according to claim 2 or 4, characterized in that, The diffusion module is provided with a plurality of diffusion subunits, and the diffusion subunits are arranged in series-parallel combination; At least one of the diffusion subunits is used as a second-stage diffusion unit, and a plurality of diffusion subunits are used as first-stage diffusion units and arranged in linear array in the Z-axis direction, and the fourth cavities of the first-stage diffusion units are in communication with each other in the Z-axis direction; The first cavity of at least one of the first-stage diffusion units is provided with a second-stage diffusion unit, the second-stage diffusion unit omits the fourth cavity, and the second cavity is in communication with the first cavity of the corresponding first-stage diffusion unit in the Y-axis direction.
8. The acoustic diffuser based on acoustic metasurface according to claim 7, characterized in that, The diffusion module is provided with six diffusion subunits, and the six diffusion subunits are arranged in series-parallel combination; Two of the diffusion subunits are used as first-stage diffusion units and arranged in linear array in the Z-axis direction, and the fourth cavities of the two first-stage diffusion units are in communication with each other in the Z-axis direction; Two diffusion sub-units are respectively arranged in the first cavities of the two primary diffusion units, and the diffusion sub-units in the first cavities of the primary diffusion units serve as secondary diffusion units; The secondary diffusion units are linearly arranged in the Z-axis direction, the secondary diffusion units are devoid of fourth cavities, and the second cavities are in communication with the first cavities of the primary diffusion units at corresponding positions in the Y-axis direction.
9. The acoustic diffuser based on acoustic metasurface according to claim 1, characterized in that, The diffusion module is provided in plurality, and the diffusion modules are fixedly connected and respectively provided with at least one diffusion sub-unit.