Acoustic metamaterial sound barrier

Abstract

The utility model provides an acoustic metamaterial sound barrier, which comprises a main body and a sound absorption component, the main body comprises two panels and a connecting piece, the two panels are arranged up and down at an interval, and the connecting piece is connected with the two panels; the sound-absorbing assembly is filled between the two panels, the sound-absorbing assembly is of a layered structure and at least comprises a first sound-absorbing layer and a second sound-absorbing layer, the first sound-absorbing layer is used for absorbing sound waves in a high-frequency band, and the second sound-absorbing layer is used for absorbing sound waves in a middle-low frequency band. According to the acoustic metamaterial sound barrier, the first sound-absorbing layer and the second sound-absorbing layer are arranged between the two panels, low-frequency sound waves and high-frequency sound waves can be well absorbed, the bandwidth of sound wave absorption is increased, the acoustic metamaterial sound barrier can be applied to sound insulation scenes of different frequency bands, and the noise reduction effect is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of sound absorption and noise reduction, and in particular, relates to an acoustic metamaterial sound barrier. Background Art

[0002] With the rapid development of modern society, the process of urbanization is accelerating, the traffic network is becoming increasingly dense, and the noise pollution problem caused by vehicle driving is becoming increasingly prominent. Especially near urban traffic lines, due to the increase in vehicle traffic and the reduction in the distance between roads and buildings, noise pollution has a serious impact on residents' daily life and working environment. In order to alleviate noise pollution, sound insulation structures are widely used in urban roads, highways and elevated lines of urban rail transit. Sound insulation structures reduce the impact of noise on the surrounding environment by blocking and absorbing noise.

[0003] Existing sound insulation structures mostly use sound-absorbing cotton of a certain thickness filled between the front and rear panels of the screen as a sound absorber. The sound-absorbing cotton is a porous material that mainly uses sound waves to resonate in the sound-absorbing cotton to absorb incident high-frequency sound waves. At the same time, the noise reduction ability is adjusted by changing the thickness of the screen and the density of the sound-absorbing cotton. However, this sound insulation structure is limited by the poor sound absorption effect of the sound-absorbing cotton on low-frequency sound waves, resulting in limited use scenarios of the existing sound insulation structure, poor noise reduction ability, and failure to achieve the expected noise reduction effect. Utility Model Content

[0004] The embodiment of the present application provides an acoustic metamaterial sound barrier to solve the technical problems in the prior art that the use scenarios of the sound insulation structure are limited and the noise reduction ability is poor.

[0005] In a first aspect, an embodiment of the present application provides an acoustic metamaterial sound barrier, wherein the acoustic metamaterial sound barrier comprises:

[0006] A main body, the main body comprising two panels and a connecting piece, the two panels are arranged with an interval up and down, and the connecting piece connects the two panels;

[0007] A sound absorbing component is filled between the two panels. The sound absorbing component is a layered structure and includes at least a first sound absorbing layer and a second sound absorbing layer. The first sound absorbing layer is used to absorb sound waves in the high frequency band, and the second sound absorbing layer is used to absorb sound waves in the medium and low frequency bands.

[0008] Optionally, the sound absorbing component further includes a third sound absorbing layer, the second sound absorbing layer is sandwiched between the first sound absorbing layer and the third sound absorbing layer, and the third sound absorbing layer is used to absorb high-frequency sound waves.

[0009] Optionally, the second sound-absorbing layer includes a sound-absorbing member and glass wool. The sound-absorbing member is an acoustic metamaterial and is used to absorb sound waves in the low-frequency band. The sound-absorbing member and the glass wool are arranged adjacent to each other in a direction parallel to the panel.

[0010] Optionally, a plurality of the sound-absorbing members and a plurality of the glass wools are provided. The plurality of sound-absorbing members and the plurality of glass wools are alternately adjacent to each other in a direction parallel to the panel in sequence.

[0011] Optionally, a sealant is filled between each sound-absorbing member and each glass wool. The sealant is used to seal the gap between the sound-absorbing member and the glass wool.

[0012] Optionally, the sound-absorbing member includes multiple layers of sound-absorbing plates. The multiple layers of sound-absorbing plates are all arranged parallel to the panel.

[0013] Optionally, the sound-absorbing member further includes a connecting plate. The multiple layers of sound-absorbing plates are arranged at intervals up and down. The connecting plate connects the multiple layers of sound-absorbing plates in a direction perpendicular to the sound-absorbing plates in sequence to form a sound-absorbing structure with a king-shaped longitudinal section.

[0014] Optionally, both the first sound-absorbing layer and the third sound-absorbing layer are glass wool.

[0015] Optionally, the outer surfaces of both the first sound-absorbing layer and the third sound-absorbing layer are wrapped with fiberglass cloth.

[0016] The acoustic metamaterial sound barrier provided by the embodiment of the present application includes a main body and a sound-absorbing component. The main body includes two panels arranged at intervals up and down, and a connecting member connecting the two panels. The sound-absorbing component is filled between the two panels. The sound-absorbing component is a layered structure and at least includes a first sound-absorbing layer and a second sound-absorbing layer. The first sound-absorbing layer is a porous structure such as sound-absorbing cotton, glass wool, or rubber sponge, and has a good sound-absorbing effect on high-frequency sound waves. When sound waves are incident on the porous substrate, scattering, reflection, or resonance occurs, and the sound energy is converted into heat, so that the sound waves are absorbed by the porous material. The second sound-absorbing layer is a sound-absorbing structure made of an acoustic metamaterial. When low-frequency sound waves are incident on the surface of the second sound-absorbing layer, the negative refraction phenomenon of the sound waves can be realized, so that the propagation direction of the sound waves in the material is opposite to that of the traditional material to absorb low-frequency sound waves. In the present application, by arranging the first sound-absorbing layer and the second sound-absorbing layer between the two panels, both low-frequency and high-frequency sound waves have a good absorption effect, the bandwidth of sound wave absorption is improved, so that the acoustic metamaterial sound barrier can be applied to sound insulation scenarios in different frequency bands, and the noise reduction effect is improved. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0018] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0019] Figure 1 A schematic diagram of the structure of the acoustic metamaterial sound barrier provided in an embodiment of the present application.

[0020] Figure 2 for Figure 1 Schematic cross-sectional view of the AA area.

[0021] Figure 3 for Figure 2 A partial enlarged schematic diagram at point B.

[0022] Figure 4 A schematic side view of a sound absorbing component in an acoustic metamaterial sound barrier provided in an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 1. Acoustic metamaterial sound barrier; 10. Main body; 11. Panel; 12. Connector; 20. Sound-absorbing component; 21. First sound-absorbing layer; 22. Second sound-absorbing layer; 221. Sound-absorbing component; 221a. Sound-absorbing panel; 221b. Connector; 222. Glass wool; 23. Third sound-absorbing layer. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0026] With the rapid development of industrialization and urbanization, noise pollution has become an important factor affecting people's quality of life. Especially in urban traffic routes, industrial areas and densely populated areas, the noise generated by vehicles, industrial equipment and daily life activities has a serious impact on the physical and mental health and work efficiency of residents. In order to reduce the interference of noise on human activities, acoustic metamaterial sound barriers are widely used in various noise control projects as an effective noise control method. Existing acoustic metamaterial sound barriers usually use thick walls or multi-layer composite panels to block noise propagation. Although these structures can reduce noise to a certain extent, they have some limitations. For example, some sound insulation structures perform well in high-frequency noise absorption, but are not effective in low-frequency noise control, resulting in limited use scenarios of sound insulation structures, inability to use sound insulation and noise reduction in different frequency bands, and inability to achieve the expected sound insulation effect.

[0027] In order to solve the technical problems of limited application scenarios and poor sound insulation and noise reduction effects of acoustic metamaterial sound barriers 1 in the prior art, the present application embodiment provides an acoustic metamaterial sound barrier 1 to solve the problems of limited application and poor noise reduction of existing sound insulation structures. It will be described below with reference to the accompanying drawings.

[0028] like Figure 1 to Figure 2 As shown, the acoustic metamaterial sound barrier 1 of the present application includes: a main body 10 and a sound absorbing component 20; the main body 10 includes two panels 11 and a connecting piece 12, the two panels 11 are arranged with an interval up and down, and the connecting piece 12 connects the two panels 11; the sound absorbing component 20 is filled between the two panels 11, the sound absorbing component 20 is a layered structure, and includes at least a first sound absorbing layer 21 and a second sound absorbing layer 22, the first sound absorbing layer 21 is used to absorb sound waves in the high frequency band, and the second sound absorbing layer 22 is used to absorb sound waves in the medium and low frequency bands.

[0029] Specifically, the main body 10 of the acoustic metamaterial sound barrier 1 is composed of two parallel panels 11, which are made of high-strength aluminum alloy or thin steel plate materials to ensure the durability and impact resistance of the barrier. The surface of the panel 11 is treated with a special coating, which has anti-ultraviolet, corrosion-resistant and self-cleaning functions, and is suitable for long-term use in outdoor environments. The size of the panel 11 can be customized according to the needs of the actual application scenario, and the thickness can be adjusted according to the required sound insulation effect, which is not further limited here.

[0030] The connector 12 is used to connect the two panels 11, and can be fixed by bolts, rivets or welding. The design of the connector 12 needs to ensure that it can stably connect the panels 11 and has a certain elasticity to adapt to possible temperature changes or mechanical vibrations. In this embodiment, the connector 12 is made of high-strength steel or hard plastic and has a U-shape or H-shape, which is connected to the ends of the two panels 11 to provide sufficient support and reduce the reflection of sound waves.

[0031] The sound absorbing component 20 is filled between the two panels 11 to form a layered structure. The first sound absorbing layer 21 and the second sound absorbing layer 22 are made of different materials according to their sound absorbing characteristics. The first sound absorbing layer 21 uses porous materials with high porosity, such as polyurethane foam, glass wool 222, and sound absorbing cotton. The microporous structure inside these materials can effectively scatter and absorb high-frequency sound waves. The first sound absorbing layer 21 can be designed with different thicknesses or density gradients to adapt to sound waves of different frequencies. For example, the surface layer has a higher density, which gradually decreases toward the inner layer to increase the frequency band of sound waves that can be absorbed by the first sound absorbing layer 21.

[0032] The second sound absorbing layer 22 uses acoustic metamaterials, which achieve efficient absorption of low-frequency sound waves through their unique microstructures. Alternatively, the structures in the second sound absorbing layer 22 are designed as resonant sound absorbers, which resonate with incident sound waves at specific frequencies, thereby enhancing the absorption of low-frequency sound waves. Alternatively, the second sound absorbing layer 22 can be designed with a multi-layer structure, with each layer using different materials or structures to cover a wider frequency range and achieve continuous absorption of low-frequency to medium-frequency sound waves.

[0033] The present application arranges a first sound-absorbing layer 21 and a second sound-absorbing layer 22 between the two panels 11, thereby achieving good absorption effects on both low-frequency and high-frequency sound waves and improving the bandwidth of sound wave absorption, so that the acoustic metamaterial sound barrier 1 can be used in sound insulation scenarios of different frequency bands, thereby improving the noise reduction effect.

[0034] Optional, such as Figure 2 and Figure 3 As shown, the sound absorbing assembly 20 further includes a third sound absorbing layer 23 , which is used to absorb high-frequency sound waves. The second sound absorbing layer 22 is sandwiched between the first sound absorbing layer 21 and the third sound absorbing layer 23 .

[0035] In this embodiment, the third sound absorbing layer 23 also uses a porous material with high porosity to enhance the absorption capacity of high-frequency sound waves. The third sound absorbing layer 23 is sandwiched between the first sound absorbing layer 21 and the second sound absorbing layer 22 to form a sandwich structure. This sandwich structure can cover a wide frequency range from high frequency to low frequency by combining sound absorbing materials with different characteristics to achieve sound wave absorption in a wider frequency range. At the same time, by adjusting the thickness, density and pore structure of each layer of material, this sandwich structure can facilitate targeted optimization of sound waves of a specific frequency or frequency range, providing a better sound absorption effect.

[0036] Optional, such as Figure 2 and Figure 3 As shown, the second sound absorbing layer 22 includes a sound absorbing member 221 and glass wool 222 . The sound absorbing member 221 is an acoustic metamaterial and is used to absorb low-frequency sound waves. The sound absorbing member 221 and the glass wool 222 are adjacently arranged in a direction parallel to the panel 11 .

[0037] In this embodiment, the sound absorbing member 221 is made of acoustic metamaterial, which has a special microstructure and can produce negative refraction phenomenon for low-frequency sound waves, thereby effectively absorbing low-frequency sound waves. The shape of the sound absorbing member 221 can be flat, I-shaped, multi-layered, wavy or honeycomb to increase its surface area and sound absorption effect. At the same time, the side of the sound absorbing member 221 with a larger surface area is arranged toward the panel 11, that is, toward the side of the sound source, so that the sound waves can be vertically incident on the surface of the sound absorbing member 221, thereby improving the negative reflection effect.

[0038] Glass wool 222 has good absorption of high-frequency sound waves, and the thickness of the sound absorbing member 221 and the glass wool 222 can be set according to the noise frequency band and noise level that need to be filtered. In the present application, the thickness of the sound absorbing member 221 and the glass wool 222 are designed to be the same, and the two are filled between the two panels 11, which can improve the support strength of the panel 11. When the acoustic metamaterial sound barrier 1 is assembled, the panel 11 can reduce the large clamping force on the sound absorbing member 221, thereby avoiding the situation where the sound absorbing member 221 is damaged.

[0039] Optional, such as Figure 2 and Figure 3 As shown, a plurality of sound absorbing members 221 and a plurality of glass wool 222 are provided, and the plurality of sound absorbing members 221 and the plurality of glass wool 222 are alternately and adjacently arranged in sequence along a direction parallel to the panel 11 .

[0040] In this embodiment, the second sound absorbing layer 22 has multiple sound absorbing members 221 and glass wool 222, which are alternately arranged in a direction parallel to the panel 11. This arrangement can enhance the sound absorption performance of the overall structure, so that when noise enters the second sound absorbing layer 22 from different positions of the panel 11 in the acoustic metamaterial sound barrier 1, it can have a good sound absorption effect on the sound waves, thereby improving the uniformity of the noise reduction of the acoustic metamaterial sound barrier 1.

[0041] Optionally, a sealing member is filled between each sound absorbing member 221 and each glass wool 222 , and the sealing member is used to seal the gap between the sound absorbing member 221 and the glass wool 222 .

[0042] In this embodiment, in order to ensure the sealing between the sound absorbing member 221 and the glass wool 222, a sealing member is filled between each sound absorbing member 221 and the glass wool 222. These sealing members can not only prevent noise from leaking from the gap, but also provide additional sound absorption effect. The shape and size of the sealing member closely match the joint between the sound absorbing member 221 and the glass wool 222 to achieve the best sealing effect.

[0043] The material of the seal can be foam particles, or rubber or silicone with high elasticity and durability. When foam particles are selected, a film is used to encapsulate the lightweight foam particles into the gaps of the sound absorbing member 221. When the sound absorbing member 221 and the glass wool 222 are assembled, the two squeeze the foam particles so that the foam particles are fully filled in the gap between the two, thereby improving the assembly effect. When the seal is made of materials such as silicone or rubber, the cross-section of the seal can be designed to be a shape that matches the gap between the glass wool 222 and the sound absorbing member 221, such as a rectangle, a wedge or a T-shape, to adapt to joints of different shapes, ensuring that the seal can be tightly filled in the gap between the sound absorbing member 221 and the glass wool 222.

[0044] Optional, such as Figure 4 As shown, the sound absorbing member 221 includes multiple layers of sound absorbing panels 221 a , and the multiple layers of sound absorbing panels 221 a are all arranged parallel to the panel 11 .

[0045] In this embodiment, the sound absorbing member 221 includes multiple layers of sound absorbing panels 221a, which are arranged parallel to the panel 11 to increase the thickness and sound absorbing effect of the sound absorbing layer. Each layer of the sound absorbing panel 221a can be made of different materials and pore structures to optimize the sound waves of a specific frequency. Of course, the same material can also be used to absorb the sound waves of the same frequency multiple times.

[0046] Optional, such as Figure 4As shown, the sound-absorbing member 221 further includes a connecting plate 221b. Multiple layers of sound-absorbing plates 221a are arranged at intervals up and down. The connecting plate 221b sequentially connects the multiple layers of sound-absorbing plates 221a in a direction perpendicular to the sound-absorbing plates 221a to form a sound-absorbing structure with a king-shaped longitudinal cross-section.

[0047] In this embodiment, the connecting plate 221b sequentially connects multiple layers of sound-absorbing plates 221a in a direction perpendicular to the sound-absorbing plates 221a, forming a sound-absorbing structure with a king-shaped longitudinal cross-section. This structural design not only increases the stability of the sound-absorbing member 221 but also provides more sound-absorbing paths to improve the sound absorption effect on sound waves.

[0048] The connecting plate 221b can be made of metal, plastic, composite material, or acoustic metamaterial. To improve the sound absorption effect of the overall structure, the surface of the connecting plate 221b can be designed with special textures or coatings, such as microporous structures or sound-absorbing coatings. These designs can further increase the scattering and absorption of sound waves. In addition, the spacing between the multiple layers of sound-absorbing plates 221a also affects the sound absorption effect. Since sound waves will reflect after passing through the sound-absorbing plates 221a of the acoustic metamaterial, the spacing between the sound-absorbing plates 221a is controlled so that the incident sound waves and the reflected sound waves cancel each other out, further improving the noise reduction effect. That is, the multiple layers of sound-absorbing plates 221a form a resonance sound-absorbing structure, which can generate resonance for sound waves of specific frequencies, thereby enhancing the absorption of low-frequency sound waves.

[0049] Optionally, both the first sound-absorbing layer 21 and the third sound-absorbing layer 23 are made of glass wool 222.

[0050] In this embodiment, both the first sound-absorbing layer 21 and the third sound-absorbing layer 23 are made of glass wool 222 material. Due to its light weight, softness, and high porosity, glass wool 222 has a good high-frequency sound absorption effect. In addition, glass wool 222 also has good heat insulation performance and is an ideal fireproof material; glass wool 222 has high chemical stability, is resistant to acid and alkali corrosion, and has a long service life. Therefore, it can improve the service life of the acoustic metamaterial sound barrier 1 and be better applied to complex outdoor environments. At the same time, the first sound-absorbing cotton and the third sound-absorbing cotton can also protect the acoustic metamaterial clamped in the middle. The thickness, density, and fiber diameter of the glass wool 222 used in the first sound-absorbing layer 21 and the third sound-absorbing layer 23 can be adjusted according to the required sound absorption frequency and effect. Glass wool 222 with the same thickness and density can be used to improve the filtering effect on specific high-frequency sound waves, or glass wool 222 with different thicknesses or densities can be used to increase the frequency band range of sound waves that the acoustic metamaterial sound barrier 1 can filter.

[0051] Optionally, the outer surfaces of both the first sound-absorbing layer 21 and the third sound-absorbing layer 23 are wrapped with fiberglass cloth.

[0052] The glass cloth not only protects the glass wool 222 from mechanical damage or water intrusion, but also increases the rigidity of the material, making it easier to handle and install. The glass cloth may be made of high-tension glass fibers, and its surface may be specially treated, such as coating or impregnation, to improve its weather resistance and fire resistance.

[0053] In practical applications, multiple acoustic metamaterial sound barriers 1 as in the above-mentioned embodiments can be provided, and multiple acoustic metamaterial sound barriers 1 are connected in sequence in a direction parallel to the panel 11. The height, length and width of the acoustic metamaterial sound barrier 1 can be designed and customized according to the requirements of the actual application scenario. In order to improve the stability and durability of the acoustic metamaterial sound barrier 1, special connection methods such as slots, mortise and tenon joints or magnetic adsorption can be used between adjacent acoustic metamaterial sound barriers 1. These connection methods can not only ensure the structural stability of the acoustic metamaterial sound barrier 1, but also facilitate installation and disassembly. The acoustic metamaterial sound barrier 1 is designed for scenes such as urban roads, highways or elevated lines of urban rail transit to effectively reduce the impact of traffic noise on the surrounding environment.

[0054] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0055] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An acoustic metamaterial sound barrier (1), characterized in that: The acoustic metamaterial sound barrier includes: A main body (10), the main body includes two panels (11) and a connecting member (12), the two panels (11) are arranged at intervals up and down, and the connecting member (12) connects the two panels (11); A sound absorption component (20), the sound absorption component (20) is filled between the two panels (11), the sound absorption component (20) is a layered structure, and at least includes a first sound absorption layer (21) and a second sound absorption layer (22), the first sound absorption layer (21) is used to absorb sound waves in the high-frequency band, and the second sound absorption layer (22) is used to absorb sound waves in the medium and low-frequency bands.

2. The acoustic metamaterial sound barrier (1) according to claim 1, characterized in that: The sound absorption component (20) further includes a third sound absorption layer (23), the second sound absorption layer (22) is clamped between the first sound absorption layer (21) and the third sound absorption layer (23), and the third sound absorption layer (23) is used to absorb sound waves in the high-frequency band.

3. The acoustic metamaterial sound barrier (1) according to claim 2, characterized in that: The second sound absorption layer (22) includes a sound absorption member (221) and glass wool (222), the sound absorption member (221) is an acoustic metamaterial and is used to absorb sound waves in the low-frequency band, and the sound absorption member (221) and the glass wool (222) are arranged adjacent to each other along the direction parallel to the panel (11).

4. The acoustic metamaterial sound barrier (1) according to claim 3, characterized in that: Both the sound absorption member (221) and the glass wool (222) are provided with a plurality of them, and the plurality of sound absorption members (221) and the plurality of glass wool (222) are arranged adjacent to each other in turn along the direction parallel to the panel (11).

5. The acoustic metamaterial sound barrier (1) according to claim 4, characterized in that: A sealing member is filled between each sound absorption member (221) and each glass wool (222), and the sealing member is used to seal the gap between the sound absorption member (221) and the glass wool (222).

6. The acoustic metamaterial sound barrier (1) according to any one of claims 3 to 5, characterized in that: The sound absorption member (221) includes multiple layers of sound absorption plates (221a), and the multiple layers of sound absorption plates (221a) are all arranged parallel to the panel (11).

7. The acoustic metamaterial sound barrier (1) according to claim 6, characterized in that: The sound absorption member (221) further includes a connecting plate (221b), the multiple layers of sound absorption plates (221a) are arranged at intervals up and down, and the connecting plate (221b) connects the multiple layers of sound absorption plates (221a) in turn along the direction perpendicular to the sound absorption plates (221a) to form a sound absorption structure with a king-shaped longitudinal section.

8. The acoustic metamaterial sound barrier (1) according to any one of claims 2 to 5, characterized in that: Both the first sound absorption layer (21) and the third sound absorption layer (23) are glass wool (222).

9. The acoustic metamaterial sound barrier (1) according to claim 8, characterized in that: The outer surfaces of the first sound absorption layer (21) and the third sound absorption layer (23) are both wrapped with fiberglass cloth.

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