Flat-plate ultra-wideband thin-layer metamaterial sound-absorbing module, superstructure silent box and superstructure anechoic chamber

Abstract

The present invention discloses a flat-plate ultra-wideband thin-layer metamaterial sound absorption module, a silent box, and an anechoic chamber. The sound absorption module includes a first metastructure sound absorption unit and a second metastructure sound absorption unit. The first metastructure sound absorption unit includes a first U-shaped cavity plate and a first phonon slow reflection cavity portion, the first phonon slow reflection cavity portion being disposed within a U-shaped groove of the first U-shaped cavity plate. The second metastructure sound absorption unit includes a second U-shaped cavity plate and a second phonon slow reflection cavity portion, the second U-shaped cavity plate having an upward opening and being spaced apart from the first U-shaped cavity plate. The second phonon slow reflection cavity portion is disposed between the first and second U-shaped cavity plates. The present invention is applicable to the fields of energy conservation and environmental protection, new materials, and noise control. It not only has good sound absorption effects within a low-frequency broadband range, but also is simple to manufacture, low-cost, and highly reliable. It overcomes the shortcomings of traditional acoustic metamaterial sound absorption structures, such as narrow sound absorption bandwidth, complex topological configuration, and poor reliability.

Description

Technical Field

[0001] The present invention relates to the technical fields of energy conservation and environmental protection, new materials and noise control, and specifically to a flat-plate ultra-wideband thin-layer metamaterial sound absorption module, a superstructure silent box and a superstructure anechoic chamber. Background Art

[0002] Because mid- and high-frequency noise has short wavelengths and weak propagation, it can be effectively controlled using traditional sound absorption technologies. However, low-frequency noise has long wavelengths and strong penetration, so traditional methods often require thicker materials or heavier materials to control it. Achieving efficient low-frequency, broadband noise absorption is a major challenge facing both academics and engineers.

[0003] In recent years, the proposal and development of the concept of acoustic metamaterials has provided new ideas for solving the problem of low-frequency, broadband and efficient noise reduction. Many scholars and engineering technicians have successively devoted themselves to the research of acoustic metamaterial noise reduction, and related work has made certain progress.

[0004] Among them, the patent is named Lightweight Low-Frequency Sound Insulation Structure Based on Piezoelectric Shunt-Type Acoustic Metamaterial (Patent Publication Number: CN107818777A). The structure consists of a grid structure, a thin skin, a piezoelectric sheet, and a resonant shunt circuit. The low-frequency band gap can be regulated through the shunt circuit design, thereby achieving the purpose of low-frequency sound insulation and noise reduction; but it requires the additional configuration of a shunt circuit system, and the control system is relatively complex.

[0005] Among them, the patent name is a multi-unit metasurface array and broadband sound lining unit structure (patent publication number: CN114913836A). The multi-unit metasurface array is composed of a plurality of inner-extended hole-type Helmholtz resonators composed of inner-extended holes and cavities; it can achieve low-frequency broadband sound absorption effects; but it requires a combination of many units and adopts a double-layer structure. The internal holes also need to be inserted with tubes of different sizes / lengths (inner-extended holes). The structure is relatively complex and the manufacturing cost is high, which is not conducive to practical applications.

[0006] Among them, the patent named "A Collaboratively Coupled Double-Layer Thin Plate-Type Metasurface Device" (Patent Publication No.: CN109741726) and the patent named "A Lightweight, Low-Frequency, Broadband Thin Film Metamaterial Sound Insulation Device" (Patent Publication No.: CN103594080A) are both thin-film acoustic metamaterials. Although their main structures are very light and thin, their operating frequency band is narrow, their anti-interference ability is poor, and they are easily damaged. Summary of the Invention

[0007] In response to the above-mentioned deficiencies in the prior art, the present invention provides a flat-plate ultra-wideband thin-layer metamaterial sound absorption module, a superstructure silent box and a superstructure anechoic chamber, which have the advantages of low cost, high reliability, and low-frequency broadband sound absorption performance.

[0008] To achieve the above-mentioned object, the present invention provides a flat-plate ultra-wideband thin-layer metamaterial sound absorption module, comprising a first metastructure sound absorption unit and a second metastructure sound absorption unit;

[0009] The first metastructure sound absorbing unit includes a first U-shaped cavity plate and a first phonon diffuse reflection cavity portion, the opening of the first U-shaped cavity plate faces upward, and the first phonon diffuse reflection cavity portion is arranged in a U-shaped groove of the first U-shaped cavity plate;

[0010] The second metastructure sound absorbing unit includes a second U-shaped cavity plate and a second phonon diffuse reflection cavity portion, wherein the opening of the second U-shaped cavity plate faces upward and is spaced apart and sleeved on the first U-shaped cavity plate;

[0011] The second phonon diffuse reflection cavity is provided between the first U-shaped cavity plate and the second U-shaped cavity plate.

[0012] In one embodiment, the flat-plate ultra-wideband thin-layer metamaterial sound absorption module further includes a first blocking portion and a second blocking portion;

[0013] The first blocking portion is connected to the first end of the first U-shaped cavity plate and the first end of the second U-shaped cavity plate to cover the first ends of the first phonon diffuse reflection cavity portion and the second phonon diffuse reflection cavity portion;

[0014] The second blocking portion is connected to the second end of the first U-shaped cavity plate and the second end of the second U-shaped cavity plate to cover the second ends of the first phonon diffuse reflection cavity portion and the second phonon diffuse reflection cavity portion.

[0015] In one embodiment, the first phonon diffuse reflection cavity includes at least two first resistive sound absorption modules and at least one first wave modulation channel;

[0016] The first resistive sound absorbing modules are sequentially arranged in the U-shaped groove of the first U-shaped cavity plate at intervals along the width direction, and a first modulation channel is formed between two adjacent first resistive sound absorbing modules, and both ends of the first modulation channel are respectively covered by the first blocking portion and the second blocking portion.

[0017] In one embodiment, the bottoms of two adjacent first resistive sound absorbing modules are integrally formed; or

[0018] The bottoms of any two adjacent first resistive sound absorbing modules are integrally formed.

[0019] In one embodiment, a first supporting portion is provided in the first modulation channel.

[0020] In one embodiment, the second phonon diffuse reflection cavity includes at least two second resistive sound absorption modules and at least one second wave modulation channel;

[0021] Each second resistive sound absorbing module is sequentially spaced apart between the first U-shaped cavity plate and the second U-shaped cavity plate along the width direction, and a second wave modulation channel is enclosed between two adjacent second resistive sound absorbing modules, and the second wave modulation channel is located between the side wall of the first U-shaped cavity plate and the side wall of the second U-shaped cavity plate;

[0022] Both ends of the second wave modulation channel are covered by the first blocking portion and the second blocking portion respectively.

[0023] In one embodiment, the bottoms of two adjacent second resistive sound absorbing modules are integrally formed; or

[0024] The bottoms of any two adjacent second resistive sound absorbing modules are integrally formed.

[0025] In one embodiment, a second supporting portion is provided in the second modulation channel.

[0026] In one embodiment, the flat-plate ultra-wideband thin-layer metamaterial sound absorption module further includes a bearing structure, which is fixedly connected to the top of the first U-shaped cavity plate and the top of the second U-shaped cavity plate.

[0027] In one embodiment, the load-bearing structure is an independent beam-type structure or a rod-type structure; or

[0028] The load-bearing structure is a truss structure composed of a beam structure and / or a rod structure.

[0029] In one embodiment, the flat-plate ultra-wideband thin-layer metamaterial sound absorption module may further include a surface protection device, which is fixedly connected to the top of the first U-shaped cavity plate and the top of the second U-shaped cavity plate. The surface protection device may be a highly sound-transmitting perforated plate or a perforated mesh (such as an aluminum alloy perforated plate, a stainless steel mesh, a nylon mesh, etc.).

[0030] In addition, according to the actual engineering application, the flat-plate ultra-wideband thin-layer metamaterial sound absorption module may also include other functional devices, such as an anti-overflow device and an anti-oil pollution device.

[0031] To achieve the above objectives, the present invention also provides a superstructure sound-absorbing box, comprising a first box body and a second box body, wherein the first box body is sleeved on the second box body, and the second box body is formed by splicing several of the above-mentioned flat-plate ultra-wideband thin-layer metamaterial sound-absorbing modules.

[0032] To achieve the above objectives, the present invention further provides a metastructure anechoic chamber, wherein part or all of the inner wall surfaces of the metastructure anechoic chamber are covered with a plurality of the above-mentioned flat-plate ultra-wideband thin-layer metamaterial sound-absorbing modules.

[0033] Compared with the prior art, the present invention has the following beneficial technical effects:

[0034] The present invention forms a sound absorption module by combining the first meta-structure sound absorption unit and the second meta-structure sound absorption unit, and applies it to silent boxes and anechoic rooms. It not only has good sound absorption effect in the low-frequency broadband range, but also has simple processing and manufacturing, low cost and high reliability, overcoming the shortcomings of traditional acoustic metamaterial sound absorption structures such as narrow sound absorption band, complex topological configuration and poor reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of a flat-plate ultra-wideband thin-layer metamaterial sound absorption module in Example 1 of the present invention;

[0037] Figure 2 Schematic diagram of the assembly of the flat-plate ultra-wideband thin-layer metamaterial sound absorption module in Example 1 of the present invention;

[0038] Figure 3 This is a schematic diagram of an outer frame embodiment of a flat-type ultra-wideband thin-layer metamaterial sound absorption module in Example 1 of the present invention;

[0039] Figure 4 This is a schematic diagram of a first implementation of the load-bearing structure in Example 1 of the present invention;

[0040] Figure 5 This is a schematic diagram of a second implementation of the support structure in Example 1 of the present invention;

[0041] Figure 6 This is a schematic diagram of an implementation method of providing lugs on the first U-shaped cavity plate in Example 1 of the present invention;

[0042] Figure 7 This is a schematic diagram of a third implementation of the support structure in Example 1 of the present invention;

[0043] Figure 8 This is a schematic diagram of an implementation of the first supporting portion in Example 1 of the present invention;

[0044] Figure 9 This is a schematic diagram of an implementation of the second supporting portion in Example 1 of the present invention;

[0045] Figure 10 This is a schematic diagram of a surface protection device provided on a flat-plate ultra-wideband thin-layer metamaterial sound-absorbing module in Example 1 of the present invention;

[0046] Figure 11 This is an enlarged schematic diagram of the face protection device in Example 1 of the present invention;

[0047] Figure 12 This is a schematic diagram of another embodiment of the cavity plate portion in Example 1 of the present invention;

[0048] Figure 13 This is a schematic diagram of the first implementation structure of the superstructure soundproof box in Example 2 of the present invention;

[0049] Figure 14 This is a schematic diagram of a second implementation structure of the superstructure soundproof box in Example 2 of the present invention;

[0050] Figure 15 Schematic diagram of the structure of the superstructure anechoic chamber in Example 3 of the present invention.

[0051] Figure 1: first meta-structure sound absorbing unit 1, first U-shaped cavity plate 11, first phonon diffuse reflection cavity 12, first resistive sound absorbing module 121, first modulation channel 122, second meta-structure sound absorbing unit 2, second U-shaped cavity plate 21, second phonon diffuse reflection cavity 22, second resistive sound absorbing module 221, second modulation channel 222, first blocking part 3, second blocking part 4, bearing structure 5, face protection device 51, first supporting part 6, second supporting part 7; flat-plate ultra-wideband thin layer metamaterial sound absorbing module 8, operating door panel 9, first box 10, second box 11; soundproof room 12.

[0052] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection, electrical connection, physical connection, or wireless communication connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] For ease of understanding, the directions are defined as follows in this embodiment:

[0059] The length direction in this embodiment is Figure 1 The X-axis direction in

[0060] The width direction in this embodiment is Figure 1 The Y-axis direction in

[0061] The vertical direction in this embodiment is Figure 1 The Z-axis direction.

[0062] Example 1

[0063] like Figures 1 to 3 The figure shows a flat-plate ultra-wideband thin-layer metamaterial sound absorption module disclosed in this embodiment, which mainly includes a first metastructure sound absorption unit 1, a second metastructure sound absorption unit 2, a first blocking portion 3 and a second blocking portion 4.

[0064] The first meta-acoustic absorption unit 1 comprises a first U-shaped cavity plate 11 and a first phonon diffuse reflection cavity 12. The first U-shaped cavity plate 11 opens upward and is located within the U-shaped groove of the first U-shaped cavity plate 11. The second meta-acoustic absorption unit 2 comprises a second U-shaped cavity plate 21 and a second phonon diffuse reflection cavity 22. The second U-shaped cavity plate 21 opens upward and is spaced apart and sleeved on the first U-shaped cavity plate 11. The vertical top of the first U-shaped cavity plate 11 is flush with the vertical top of the second U-shaped cavity plate 21. The second phonon diffuse reflection cavity 22 is located between the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21. That is, from the inside out, the second meta-acoustic absorption unit 2 surrounds the first meta-acoustic absorption unit 1, together forming a flat-plate ultra-wideband thin-layer metamaterial sound absorption module. The first blocking portion 3 is simultaneously connected to the first end of the first U-shaped cavity plate 11 along the length direction and the first end of the second U-shaped cavity plate 21 along the length direction by welding, bolting, gluing or snap connection, so as to cover the first end of the first phonon diffuse reflection cavity portion 12 and the second phonon diffuse reflection cavity portion 22 along the length direction; the second blocking portion 4 is simultaneously connected to the second end of the first U-shaped cavity plate 11 along the length direction and the second end of the second U-shaped cavity plate 21 along the length direction by welding, bolting, gluing or snap connection, so as to cover the second end of the first phonon diffuse reflection cavity portion 12 and the second phonon diffuse reflection cavity portion 22 along the length direction.

[0065] In this embodiment, the first phonon diffuse reflection cavity 12 is composed of a first resistive sound absorbing module 121 and a first modulation channel 122. The first modulation channel 122 is a gap opened on the first resistive sound absorbing module 121. Except for the vertical upper part (inlet direction) of the first modulation channel 122, which is an open structure, the other directions are surrounded by the first blocking portion 3 and / or the second blocking portion 4 and / or the first resistive sound absorbing module 121 and / or the first U-shaped cavity plate 11.

[0066] In practice, the first phonon diffuse reflection cavity 12 includes at least two first resistive sound absorption modules 121 and at least one first modulation channel 122. Each first resistive sound absorption module 121 is sequentially spaced along the width of the first U-shaped cavity plate 11 within the U-shaped groove. A first modulation channel 122 is formed between two adjacent first resistive sound absorption modules 121, and the ends of the first modulation channel 122 are covered by the first blocking portion 3 and the second blocking portion 4, respectively. Each first resistive sound absorption module 121 is mounted within the first U-shaped cavity plate 11 by gluing or securing with a bracket.

[0067] More specifically, the bottoms of some adjacent first resistive sound absorbing modules 121 are integrally formed; or the bottoms of any two adjacent first resistive sound absorbing modules 121 are integrally formed. This means that all first resistive sound absorbing modules 121 within the first U-shaped cavity plate 11 can be considered a single entity. When a first modulation channel 122 is provided on this integral first resistive sound absorbing module 121, the first modulation channel 122 can vertically penetrate the entire first resistive sound absorbing module 121, or it can partially penetrate, for example, through one-third or half of the first resistive sound absorbing module 121. Specifically, if the depth of the U-shaped groove of the first U-shaped cavity plate 11 and the vertical height of the first resistive sound absorbing module 121 are both q1, and for example, the first resistive sound absorbing module 121 has two first modulation channels 122, the vertical depths of the two first modulation channels 122 can be set to q1 and q1 / 3, respectively.

[0068] In this embodiment, the second phonon diffuse reflection cavity 22 is composed of a second resistive sound absorbing module 221 and a second wave modulation channel 222. The second wave modulation channel 222 is a gap opened on the second resistive sound absorbing module 221. Except for the vertical upper part (inlet direction) of the second wave modulation channel 222, which is an open structure, the other directions are surrounded by the first blocking portion 3 and / or the second blocking portion 4 and / or the second resistive sound absorbing module 221 and / or the second U-shaped cavity plate 21.

[0069] In specific applications, the second phonon diffuse reflection cavity 22 includes at least two second resistive sound absorption modules 221 and at least one second modulation channel 222. Each second resistive sound absorption module 221 is sequentially spaced along the width direction between the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21. A second modulation channel 222 is formed between two adjacent second resistive sound absorption modules 221. The second modulation channel 222 is located between the sidewalls of the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21. The ends of the second modulation channel 222 are respectively covered by the first blocking portion 3 and the second blocking portion 4. Each second resistive sound absorption module 221 is disposed within the second U-shaped cavity plate 21 and the first U-shaped cavity plate 11 by gluing or fixing with a bracket.

[0070] More specifically, the bottoms of some adjacent second resistive sound absorbing modules 221 are integrally formed; or the bottoms of any two adjacent first resistive sound absorbing modules 121 are integrally formed. This means that all second resistive sound absorbing modules 221 between the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21 can be considered a single entity. When a second modulation channel 222 is provided on this integral second resistive sound absorbing module 221, the second modulation channel 222 can vertically penetrate the entire second resistive sound absorbing module 221, or partially penetrate, for example, through one-third or half. Specifically, if the depth of the U-shaped groove of the second U-shaped cavity plate 21 and the vertical height of the second resistive sound absorbing module 221 between the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21 are both q2, and for example, the second resistive sound absorbing module 221 has three second modulation channels 222, then the vertical depths of the three second modulation channels 222 can be set to q2, q2 / 2, and q2 / 5, respectively.

[0071] As a preferred embodiment, the flat-plate ultra-wideband thin-layer metamaterial sound absorption module may further include a bearing structure 5, which is fixedly connected to the top of the first U-shaped cavity plate 11 and the top of the second U-shaped cavity plate 21 to play a role in connection and fixing. Specifically, the bearing structure 5 can be set as an independent beam structure or rod structure, or as a truss structure composed of beam structures and / or rod structures, that is, Figure 4 、 Figure 5 More specifically, the first U-shaped cavity plate 11, the second U-shaped cavity plate 21 and the bearing structure 5 can be provided with lugs, and connection holes can be provided on the lugs. The lugs of the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21 are connected with the corresponding lugs of the bearing structure 5 by matching bolts to achieve connection and fixation. Figure 6 , which is a schematic diagram of a lug at the top of one side plate of the second U-shaped cavity plate 21. This lug is a strip-shaped plate located at the top of the second U-shaped cavity plate 21, with connection holes arranged in a rectangular array on the strip-shaped plate. The first U-shaped cavity plate 11 and the supporting structure 5 can also adopt the same structural arrangement. It is worth noting that in specific implementations, the lug is not limited to a strip-shaped plate and can also be other structures, such as block-shaped plates located at both ends of the top of the second U-shaped cavity plate 21.

[0072] Of course, in the specific process, the bearing structure 5 can also be set as a bearing plate between the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21, that is, the bearing structure 5 is connected to the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21 by screws, bolts or welding on both sides along the width direction. Figure 7In this case, multiple supporting plates can be interspersed between the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21 to form the supporting structure 5. Although the supporting structure 5 in this embodiment divides the second resistive sound absorption module 221 and the second modulation channel 222 into multiple sections along the length direction, it does not affect the overall sound absorption performance of the flat-type ultra-wideband thin-layer metamaterial sound absorption module.

[0073] As a preferred embodiment, a first support portion 6 is provided in the first modulation channel 122, and a second support portion 7 is provided in the second modulation channel 222, so as to support the first modulation channel 122 and the second modulation channel 222, and prevent the first modulation channel 122 and the second modulation channel 222 from being deformed due to load, thereby reducing the sound absorption performance. In the specific application process, the first support portion 6 and the second support portion 7 can be rectangular brackets, triangular brackets, nails, etc. provided in the first modulation channel 122 and the second modulation channel 222, and their shapes can be adaptively adjusted according to the shapes of the first modulation channel 122 and the second modulation channel 222. For example, in this embodiment Figure 1 、 Figure 2 The first modulation channel 122 shown is a triangular prism channel, and the first support portion 6 can be set to Figure 8 The triangular bracket shown in this embodiment Figure 1 、 Figure 2 The second modulation channel 222 shown is a quadrangular prism channel, and the second support portion 7 can be set to Figure 9 Rectangular bracket shown.

[0074] refer to Figure 10 The flat-plate ultra-wideband thin-layer metamaterial sound absorbing module may further include a surface protection device 51, which is fixedly connected to the top of the first U-shaped cavity plate 11 and the top of the second U-shaped cavity plate 21, and covers the supporting mechanism 5. Figure 11 The protective surface can be a highly acoustically transparent perforated plate or mesh, such as aluminum alloy perforated plate, stainless steel mesh, or nylon mesh, to protect the top of the flat-plate, ultra-wideband, thin-layer metamaterial sound-absorbing module. Furthermore, other functional devices, such as overflow prevention devices and oil-stain prevention devices, can be installed on top of the flat-plate, ultra-wideband, thin-layer metamaterial sound-absorbing module, depending on the specific project application.

[0075] In this embodiment, the first U-shaped cavity plate 11, the second U-shaped cavity plate 21, the first blocking portion 3 and the second blocking portion 4 are made of aluminum alloy, iron, stainless steel, titanium alloy, carbon fiber composite material, glass fiber composite material, concrete or plastic, the first resistive sound absorbing module 121 and the second resistive sound absorbing module 221 are made of metal foam, glass wool or polyurethane, and the bearing structure 5, the first supporting portion 6 and the second supporting portion 7 are made of stainless steel, aluminum alloy, wood, plastic or nylon.

[0076] It is worth noting that the cavity plate portion of the flat-plate ultra-wideband thin-layer metamaterial sound absorption module in this embodiment is not limited to the first U-shaped cavity plate 11 and the second U-shaped cavity plate 21 with a U-shaped structure. Two L-shaped cavity plates can also be directly spliced ​​together by hinges, bolts or welding to form a cavity plate with two U-shaped cavities, that is, Figure 12 shown.

[0077] It is worth noting that the first and second blocking portions 3 and 4 in this embodiment primarily serve a blocking function. If the first or second end of the flat-plate ultra-wideband thin-layer metamaterial sound-absorbing module is placed against a wall or grounded during use, the corresponding first and second blocking portions 3 and 4 may not be required. The first and second supporting portions 6 and 7 primarily serve to transmit waves and stabilize the structure (support and prevent collapse). Once the other structures have been integrated into the design to provide the corresponding wave-transmitting and supporting functions, the first and second supporting portions 6 and 7 may no longer be required.

[0078] The working effect / principle of the flat-plate ultra-wideband thin-layer metamaterial sound absorption module in this embodiment is as follows:

[0079] 1. The flat-plate, ultra-wideband, thin-layer metamaterial sound absorption module in this embodiment combines the advantages of low cost, high reliability, low-frequency, broadband sound absorption performance, multi-degree-of-freedom impedance modulation, anti-collapse, and load-bearing capacity. On the one hand, different configurations and dimensions can be used to form phonon diffuse reflection cavities with different equivalent lengths. On the other hand, the U-shaped curved cavity design significantly increases the effective length of the phonon diffuse reflection cavity without increasing the thickness of the metamaterial sound absorption module, facilitating the efficient absorption of lower-frequency sound waves.

[0080] 2. In this embodiment, each phonon diffuse reflection cavity is matched with a resistive sound absorption module and a wave modulation channel. Through their synergistic effect, efficient coordinated modulation of the module impedance can be achieved;

[0081] 3. In this embodiment, the support portion is arranged in a common pattern within the wave modulation channel, which takes into account both wave transmission and solidification, has a stable impedance modulation effect, high reliability and strong anti-interference ability;

[0082] 4. All peripheral cavity plates in this embodiment are U-shaped and have the same configuration, which reduces the number of configuration specifications required for the product, thereby reducing the stocking costs of raw materials and semi-finished products and improving product manufacturing accuracy;

[0083] 5. The phonon diffuse reflection cavity and the U-shaped cavity plate in this embodiment have a unidirectional constant cross-section (in the x-direction) and are continuous, which can reduce the number of manufacturing steps and the difficulty of dimensionality reduction. (The unidirectional constant cross-section can reduce a two-dimensional problem to a one-dimensional problem, significantly reducing the difficulty of the processing process and improving manufacturing efficiency. For example, it is easy to use profiles, or pultrusion, sheet metal bending, etc.) It can be prepared using a more efficient manufacturing process when the structural dimensions are more in line with engineering practice, facilitating large-scale and efficient production.

[0084] 6. This embodiment can combine phonon diffuse reflection cavities of different equivalent lengths with resistive sound absorption modules of different impedances inside them, so that their overall impedance is matched with that of air. This can generate multiple different low-frequency high-efficiency absorption peaks while achieving high-efficiency sound absorption at medium and high frequencies.

[0085] 7. This embodiment can enhance the coupling of different high-efficiency absorption peaks of the metamaterial sound absorption module in the low-frequency range by modulating the cooperative coupling relationship between the wave modulation channel and the resistive sound absorption module, thereby enabling the metamaterial sound absorption module to achieve efficient absorption of sound waves in the low-frequency broadband range.

[0086] Example 2

[0087] like Figure 13 、 Figure 14 The figure shows a superstructure soundproof box disclosed in this embodiment, which includes an operating door panel 9, a first box body 10 and a second box body 11, wherein the second box body 11 is formed by splicing several flat-plate ultra-wideband thin-layer metamaterial sound absorption modules 8 in Example 1.

[0088] Furthermore, the first box body 10 is hollow and has an opening on one side; the second box body 11 is hollow and enters the first box body 10 along the opening direction of the first box body 10, so that the outer wall of the second box body 11 is connected with the inner wall of the first box body 10. The second box body 11 is provided with a door panel through hole on the wall corresponding to the opening of the first box body 10, and the operating door panel 9 blocks the door panel through hole. The operating door panel 9 is hollow. Figure 13 The integral or Figure 14 The assembly shown, when assembled, can form a door within a door.

[0089] Example 3

[0090] like Figure 15The figure shows a metastructure anechoic chamber disclosed in this embodiment, comprising a soundproof suite or room 12, on the inner walls of which are mounted several flat-plate ultra-wideband thin-layer metamaterial sound-absorbing modules 8 of Example 1. The flat-plate ultra-wideband thin-layer metamaterial sound-absorbing modules 8 can be fixed to the inner walls of the suite or room 12 by gluing, snap-fitting, or bolting. For example, if the suite or room 12 is a hexahedron, covering five inner walls of the suite or room 12 with the flat-plate ultra-wideband thin-layer metamaterial sound-absorbing modules 8 creates a semi-anechoic chamber. Covering six inner walls of the suite or room 12 with the flat-plate ultra-wideband thin-layer metamaterial sound-absorbing modules 8 creates a full anechoic chamber.

[0091] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A flat-plate ultra-wideband thin-layer metamaterial sound absorption module, characterized in that: comprising a first superstructure sound absorbing unit and a second superstructure sound absorbing unit; The first metastructure sound absorbing unit includes a first U-shaped cavity plate and a first phonon diffuse reflection cavity portion, the opening of the first U-shaped cavity plate faces upward, and the first phonon diffuse reflection cavity portion is arranged in a U-shaped groove of the first U-shaped cavity plate; The second metastructure sound absorbing unit includes a second U-shaped cavity plate and a second phonon diffuse reflection cavity portion, wherein the opening of the second U-shaped cavity plate faces upward and is spaced apart and sleeved on the first U-shaped cavity plate; The second phonon diffuse reflection cavity is provided between the first U-shaped cavity plate and the second U-shaped cavity plate; The invention also includes a first blocking portion and a second blocking portion; the first blocking portion is connected to the first end of the first U-shaped cavity plate and the first end of the second U-shaped cavity plate to cover the first end of the first phonon diffuse reflection cavity portion and the second phonon diffuse reflection cavity portion; the second blocking portion is connected to the second end of the first U-shaped cavity plate and the second end of the second U-shaped cavity plate to cover the second end of the first phonon diffuse reflection cavity portion and the second phonon diffuse reflection cavity portion; The first phonon diffuse reflection cavity portion includes at least two first resistive sound absorbing modules and at least one first wave modulation channel; the first resistive sound absorbing modules are sequentially arranged in the U-shaped groove of the first U-shaped cavity plate at intervals along the width direction, and a first wave modulation channel is enclosed between two adjacent first resistive sound absorbing modules, and both ends of the first wave modulation channel are respectively covered by the first blocking portion and the second blocking portion; The second phonon diffuse reflection cavity portion includes at least two second resistive sound absorbing modules and at least one second wave modulation channel; each second resistive sound absorbing module is sequentially spaced apart along the width direction between the first U-shaped cavity plate and the second U-shaped cavity plate, and a second wave modulation channel is enclosed between two adjacent second resistive sound absorbing modules, and the second wave modulation channel is located between the side walls of the first U-shaped cavity plate and the second U-shaped cavity plate; both ends of the second wave modulation channel are respectively covered by the first blocking portion and the second blocking portion.

2. The flat-plate ultra-wideband thin-layer metamaterial sound absorption module according to claim 1, characterized in that: The bottoms of two adjacent first resistive sound absorbing modules are integrally formed; or The bottoms of any two adjacent first resistive sound absorbing modules are integrally formed.

3. The flat-plate ultra-wideband thin-layer metamaterial sound absorption module according to claim 1 or 2, characterized in that: A first supporting portion is provided in the first wave modulation channel.

4. The flat-plate ultra-wideband thin-layer metamaterial sound absorption module according to claim 1, characterized in that: The bottoms of two adjacent second resistive sound absorbing modules are integrally formed; or The bottoms of any two adjacent second resistive sound absorbing modules are integrally formed.

5. The flat-plate ultra-wideband thin-layer metamaterial sound absorption module according to claim 1 or 4, characterized in that: A second supporting portion is provided in the second wave modulation channel.

6. The flat-type ultra-wideband thin-layer metamaterial sound absorption module according to any one of claims 1-2 and 4, characterized in that: It also includes a bearing structure, which is fixedly connected to the top of the first U-shaped cavity plate and the top of the second U-shaped cavity plate.

7. The flat-plate ultra-wideband thin-layer metamaterial sound absorption module according to claim 6, characterized in that: The load-bearing structure is an independent beam structure or rod structure; or The load-bearing structure is a truss structure composed of a beam structure and / or a rod structure.

8. The flat-type ultra-wideband thin-layer metamaterial sound absorption module according to any one of claims 1-2 and 4, characterized in that: It also includes a face protection device, which is fixedly connected to the top end of the first U-shaped cavity plate and the top end of the second U-shaped cavity plate.

9. A superstructure soundproof box, comprising a first box body and a second box body, wherein the first box body is sleeved on the second box body, characterized in that: The second box is formed by splicing together several flat-plate ultra-wideband thin-layer metamaterial sound-absorbing modules according to any one of claims 1 to 8.

10. A superstructure anechoic chamber, characterized in that: Part or all of the inner wall surface of the metastructure anechoic chamber is covered with several flat-plate ultra-wideband thin-layer metamaterial sound absorption modules according to any one of claims 1 to 8.

Images