Acoustic metamaterial sound absorption and insulation barrier

Abstract

The utility model aims to provide an acoustic metamaterial sound absorption and sound insulation barrier aiming at the problems of the existing sound insulation barrier in a construction site. The acoustic metamaterial sound absorption and sound insulation barrier is composed of one or more sound absorption and sound insulation barrier units. Each sound absorption barrier unit sequentially comprises a front porous sound transmission surface, a waterproof sound transmission layer, one or more metamaterial sound absorbers and a rear sound insulation surface; or each sound absorption barrier unit sequentially comprises a front porous sound transmission surface, a front waterproof sound transmission layer, one or more bidirectional metamaterial sound absorbers, a rear waterproof sound transmission layer and a rear porous sound transmission surface. The working frequency spectrum of the acoustic metamaterial sound absorber of the device is designed for the common noise of the construction site, so that the overall noise is efficiently reduced; a traditional fiber porous sound absorption material is not used in the device, the problems of water accumulation, mildewing, layering pulverization and the like do not exist in the internal structure of the device, and the outdoor service life is long.

Description

Technical Field

[0001] The utility model belongs to the technical field of noise treatment, and specifically relates to an acoustic metamaterial sound absorption and sound insulation barrier. Background Technique

[0002] During the construction process of a construction site, various construction noises or equipment noises are always generated, such as the noises of excavators, pile drivers, mixers, and cutters, which are the most significant. They usually have characteristics such as universality, suddenness, impact, and discontinuity, and such noises have a serious impact on the lives of surrounding residents.

[0003] Moreover, the noise frequency band at the construction site is often very broadband. The main noise energy usually covers 200 - 5000 Hz, and the noise power level generated by some equipment operations or construction operations can exceed 110 dB, seriously affecting the health of construction workers and the environment of the surrounding community.

[0004] For traditional sound absorption type sound insulation barriers, the fiber and porous sound absorption materials inside them require a relatively thick volume to effectively absorb the low-frequency noise in the construction site noise. Moreover, sound absorption components such as fiber and porous materials are not resistant to the harsh outdoor use environment of the construction site, and will accelerate aging, mildew, cracking, or delamination into powder under ultraviolet rays, water accumulation, etc., and lose some or all of their acoustic functions, and pose a threat to the environment and human health.

[0005] For reflective sound insulation barriers, such as metal plates and plastic plates, or adding a hard sound-impervious protective film outside the sound absorption material, since they cannot effectively absorb the incident noise, they can only rely on acoustic reflection to improve the noise at some positions behind the barrier, while the noise pollution in other reflected areas may even intensify. Therefore, for open scenarios such as construction sites, reflective sound insulation barriers are inefficient and cannot solve the actual noise problem at the overall level. Summary of the Invention

[0006] The purpose of the utility model is to provide an acoustic metamaterial sound absorption and sound insulation barrier for the problems existing in the existing sound insulation barriers at construction sites. The working frequency spectrum of the acoustic metamaterial sound absorber of this device is designed for the common noises at construction sites, so as to efficiently reduce the overall noise; this device does not use traditional fiber and porous sound absorption materials, and there are no problems such as water accumulation, mildew, and delamination powdering in its internal structure, and it has a long service life outdoors.

[0007] The technical solution of the utility model is an acoustic metamaterial sound absorption and sound insulation barrier, which is composed of one or more sound absorption and sound insulation barrier units;

[0008] The sound-absorbing and sound-insulating barrier unit sequentially includes a front porous sound-permeable surface, a front waterproof sound-permeable layer, one or more metamaterial sound absorbers, and a rear sound-insulating surface. The outer periphery of the front porous sound-permeable surface, the front waterproof sound-permeable layer, and the rear sound-insulating surface are fixedly connected or sealed, and wrap one or more metamaterial sound absorbers therein; alternatively, the sound-absorbing and sound-insulating barrier unit sequentially includes a front porous sound-permeable surface, a front waterproof sound-permeable layer, one or more bidirectional metamaterial sound absorbers, a rear waterproof sound-permeable layer, and a rear porous sound-permeable surface. The outer periphery of the front porous sound-permeable surface, the front waterproof sound-permeable layer, the rear waterproof sound-permeable layer, and the rear porous sound-permeable surface are fixedly connected or sealed, and wrap one or more bidirectional metamaterial sound absorbers therein;

[0009] The porous sound-permeable surface is a porous or reticular structure, and the material is flame-retardant, weather-resistant, and scratch-resistant, and is used to protect the internal materials of the sound-absorbing and sound-insulating barrier unit from damage; the porous sound-permeable surface includes a front porous sound-permeable surface and a rear porous sound-permeable surface;

[0010] The waterproof sound-permeable layer is used to prevent moisture penetration and dust particle objects from entering the metamaterial sound absorber or the bidirectional metamaterial sound absorber and allow sound to penetrate into the metamaterial sound absorber or the bidirectional metamaterial sound absorber; the waterproof sound-permeable layer includes a front waterproof sound-permeable layer and a rear waterproof sound-permeable layer;

[0011] The rear sound-insulating surface is a non-porous material layer, which is used to reflect the residual noise that penetrates out of the metamaterial sound absorber and make the residual noise be absorbed by the metamaterial sound absorber again, thereby improving the overall noise reduction effect.

[0012] Further, for the above-mentioned acoustic metamaterial sound-absorbing and sound-insulating barrier, the transmission loss rating (STC) of the sound-absorbing and sound-insulating barrier is greater than 22 decibels.

[0013] Further, for the above-mentioned acoustic metamaterial sound-absorbing and sound-insulating barrier, the above-mentioned fixed connection or sealing connection method is a method such as sewing, zipping, and pressing glue.

[0014] Further, for the above-mentioned acoustic metamaterial sound-absorbing and sound-insulating barrier, the outer periphery of the sound-absorbing and sound-insulating barrier unit is fixedly edged, thereby further strengthening and protecting the sound-absorbing and sound-insulating barrier.

[0015] Further, for the above-mentioned acoustic metamaterial sound-absorbing and sound-insulating barrier, the metamaterial sound absorber or the bidirectional metamaterial sound absorber is composed of several juxtaposed and independent resonance units. The resonance behavior of each resonance unit is single-frequency and corresponds to a segment of the frequency of the broadband noise to be reduced. The resonance unit achieves the sound absorption effect by converting the noise energy into heat energy and dissipating it; the resonance unit of the metamaterial sound absorber faces the waterproof sound-permeable layer, and the resonance unit of the bidirectional metamaterial sound absorber faces the front waterproof sound-permeable layer and the rear waterproof sound-permeable layer.

[0016] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, the resonance unit includes but is not limited to Fabry-Perot (quarter-wavelength) resonators, Helmholtz resonators, and resonators with cavities of any shape that can absorb noise in a certain frequency range; several resonance units are arranged in a geometric shape with cavities of the same or different cross-sections, and each cavity is bent and folded in a certain plane, curved surface, or three-dimensional space to form a compact metamaterial sound absorber or a bidirectional metamaterial sound absorber structure.

[0017] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, the absorption frequency of the metamaterial sound absorber or bidirectional metamaterial sound absorber is at least 200 - 8000 Hz, and the noise reduction coefficient (NRC) is not less than 0.9.

[0018] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, the materials used for the waterproof sound-permeable layer include but are not limited to polytetrafluoroethylene-coated fabrics, Gore-Tex waterproof fabrics, high-mesh stainless steel wire meshes, etc.

[0019] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, neither the porous sound-permeable surface nor the waterproof sound-permeable layer affects the acoustic performance of the metamaterial sound absorber, that is, the absorption frequency after forming the sound absorption and insulation barrier unit is at least 200 - 8000 Hz, and the noise reduction coefficient is not less than 0.9.

[0020] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, connection components such as hook holes, buckle straps, etc. are provided on the outer periphery of the sound absorption and insulation barrier unit for fixing to an external support structure or for fixedly connecting to an adjacent sound absorption and insulation barrier unit.

[0021] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, a sealing component such as a magic tape, magnetic strip, etc. is provided on the outer periphery of the sound absorption and insulation barrier unit for connecting to an adjacent sound absorption and insulation barrier sealing unit.

[0022] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, one or more water discharge holes passing through the porous sound-permeable surface and the waterproof sound-permeable layer are provided below and / or on the side of the sound absorption and insulation barrier unit for discharging the accumulated water entering the interior of the sound absorption and insulation barrier unit.

[0023] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, one or more transparent material windows for observation and ventilation channels are provided in the upper, middle, or lower part of the sound absorption and insulation barrier unit, and the ventilation channels can be blocked by a movable sound insulation surface;

[0024] The porous sound-permeable surface, waterproof sound-permeable layer, and the surrounding of the sound insulation surface at the connection of the observation window or ventilation channel and the sound absorption and insulation barrier unit are fixedly connected or sealed to meet the safety operation specifications.

[0025] Furthermore, for the above-mentioned acoustic metamaterial sound absorption and insulation barrier, the sound absorption and insulation barrier is fixed to an external support structure, and the external support structure includes but is not limited to a support frame, a cross bar, a water horse enclosure, and a base.

[0026] Compared with the prior art, the advantages of the present utility model are as follows:

[0027] 1. The working frequency spectrum of the acoustic metamaterial sound absorber used in the present utility model is designed for the common noise on construction sites, and the sound absorption ability is concentrated in the main frequency band of construction site noise, that is, 200 - 8000 Hz, thereby efficiently reducing the overall noise.

[0028] 2. The function of the present utility model is based on the design of the cavity structure. It does not use traditional fibrous and porous sound absorption materials, and there is no potential harm to human health. Secondly, there are no problems such as water accumulation, mildew, delamination, and powdering in its internal structure, and its service life outdoors is long. Description of the Drawings

[0029] Figure 1 Schematic diagram of the unit structure of the sound absorption and insulation barrier;

[0030] Figure 2 、 Figure 1 Cross-sectional view along the A - A' direction;

[0031] Figure 3 、 Figure 2 Partial enlarged view of the cross-sectional view;

[0032] Figure 4 Schematic diagram of the three-dimensional structure of the metamaterial sound absorber;

[0033] Figure 5 Schematic diagram of the three-dimensional structure of the sound absorption and insulation barrier unit in Embodiment 2;

[0034] Figure 6 Schematic diagram of the three-dimensional structure of the sound absorption and insulation barrier unit in Embodiment 3;

[0035] Figure 7 Schematic diagram of the three-dimensional structure of the sound absorption and insulation barrier unit in Embodiment 4;

[0036] Figure 8 Schematic diagram of the three-dimensional structure of the sound absorption and insulation barrier unit in Embodiment 5;

[0037] Figure 9 Schematic diagram of the three-dimensional structure of the vertical plate of the acoustic metamaterial sound absorption and insulation barrier in Embodiment 6;

[0038] Figure 10 Schematic diagram of the three-dimensional structure of the acoustic metamaterial sound absorption and insulation barrier in Embodiment 6;

[0039] Figure 11, Schematic structural diagram of the acoustic metamaterial sound absorption and insulation barrier of Example 7;

[0040] Figure 12 , Left view of the schematic structural diagram of Example 7;

[0041] Figure 13 , Three-dimensional structural schematic diagram of the acoustic metamaterial sound absorption and insulation barrier of Example 8;

[0042] Among them, 1. Front porous sound-permeable surface, 2. Waterproof sound-permeable layer, 3. Metamaterial sound absorber, 4. Rear surface, 5. Edge wrapping, 6. Observation window, 7. Ventilation opening that can be blocked, 8. Water horse barrier, 9. Enclosure;

[0043] 11. Hook hole, 12. Water outlet hole, 13. Binding strap, 14. Hook. Detailed implementation mode

[0044] Example 1

[0045] An acoustic metamaterial sound absorption and insulation barrier, as shown in Figures 1 - 5 , is composed of one or more sound absorption and insulation barrier units; connection components such as hook holes 11, buckle straps, etc. are arranged on the outer periphery of the sound absorption and insulation barrier unit for fixing to an external support structure or for fixedly connecting with adjacent sound absorption and insulation barrier units; and, a sealing component such as a magic drag, magnetic sticker strip, etc. is also arranged on the outer periphery of the sound absorption and insulation barrier unit for connecting with an adjacent sound absorption and insulation barrier sealing unit;

[0046] In this embodiment, the sound absorption and insulation barrier unit sequentially includes a front porous sound-permeable surface 1, a waterproof sound-permeable layer 2, a metamaterial sound absorber 3 and a rear sound insulation surface 4. The outer periphery of the front porous sound-permeable surface, the front waterproof sound-permeable layer and the rear sound insulation surface are fixedly connected or sealed and connect, and a metamaterial sound absorber is wrapped inside. The fixed connection or sealing connection is carried out by means of sewing, zippers, hot melt adhesive, etc.; the sound absorption and insulation barrier unit is provided with an outer peripheral edge wrapping 5 to further strengthen and protect the sound absorption and insulation barrier;

[0047] The front porous sound-permeable surface is a porous or mesh structure, and the material is flame-retardant, weather-resistant and scratch-resistant, protecting the internal materials of the sound absorption and insulation barrier unit from damage;

[0048] The front waterproof sound-permeable layer is used to prevent moisture penetration and dust particle objects from entering the metamaterial sound absorber and allow sound to penetrate into the metamaterial sound absorber; the materials of the waterproof sound-permeable layer include but are not limited to polytetrafluoroethylene coated fabric, Gore-Tex waterproof fabric, high-mesh stainless steel wire mesh, etc.

[0049] Neither the waterproof sound-permeable layer nor the front porous sound-permeable surface affects the acoustic performance of the internal metamaterial absorber. That is, after forming the overall sound-absorbing and sound-insulating barrier unit, its absorption frequency includes at least 200 - 8000 Hz, and the noise reduction coefficient (NRC) is not less than 0.9;

[0050] The metamaterial absorber is composed of several juxtaposed and independent resonance units. The resonance behavior of each resonance unit is single-frequency and corresponds to a section of the frequency in the broadband noise to be reduced. The resonance unit achieves the sound absorption effect by converting the noise energy into heat energy and dissipating it; the openings of the resonance units of the metamaterial absorber face the waterproof sound-permeable layer; the resonance units include, but are not limited to, Fabry - Perot (quarter-wavelength) resonators, Helmholtz resonators, and resonators with cavities of any shape that can absorb noise of a certain frequency range; several resonance units are arranged in a geometric shape with cavities of the same or different cross-sections, and each cavity is bent and folded in a certain plane, curved surface, or in three-dimensional space to form a compact metamaterial absorber structure; the absorption frequency of the metamaterial absorber includes at least 200 - 8000 Hz, and the noise reduction coefficient (NRC) is not less than 0.9;

[0051] The rear sound-insulating surface is a non-porous material layer, which is used to reflect the residual noise that penetrates out of the metamaterial absorber and make the residual noise be absorbed by the metamaterial absorber again, thereby improving the overall noise reduction effect;

[0052] The sound transmission loss rating (STC) of the sound-absorbing and sound-insulating barrier is greater than 22 dB.

[0053] Example 2

[0054] An acoustic metamaterial sound-absorbing and sound-insulating barrier, see Figure 5 , having the same structure as Example 1, except that in this example, the sound-absorbing and sound-insulating barrier unit sequentially includes a front porous sound-permeable surface 1, a waterproof sound-permeable layer 2, a plurality of acoustic metamaterial absorbers 3, and a rear sound-insulating surface 4. The outer peripheries of the front porous sound-permeable surface, the front waterproof sound-permeable layer, and the rear sound-insulating surface are fixedly connected or sealed, and the plurality of metamaterial absorbers are wrapped therein, and the front porous sound-permeable surface, the front waterproof sound-permeable layer, and the rear sound-insulating surface are fixedly connected or sealed around the outer periphery of each metamaterial absorber. Using a plurality of metamaterial absorbers facilitates operations such as folding and bending of the sound-insulating barrier.

[0055] Example 3

[0056] An acoustic metamaterial sound absorption and insulation barrier has the same structure as that of Embodiment 1, except that in this embodiment, the sound absorption and insulation barrier unit sequentially includes a front porous sound-permeable surface, a front waterproof sound-permeable layer, one or more bidirectional metamaterial sound absorbers, a rear waterproof sound-permeable layer, and a rear porous sound-permeable surface. The front porous sound-permeable surface, the front waterproof sound-permeable layer are fixedly connected or hermetically connected to the outer periphery of the rear sound insulation surface, and each metamaterial sound absorber is wrapped therein;

[0057] The front porous sound-permeable surface and the rear porous sound-permeable surface are porous or reticular structures, and the materials are flame-retardant, weather-resistant, and scratch-resistant, protecting the internal materials of the sound absorption and insulation barrier unit from damage;

[0058] The front waterproof and breathable layer and the rear waterproof and breathable layer are used to prevent moisture penetration and dust particulate matter from entering the metamaterial sound absorber or the bidirectional metamaterial sound absorber and allow sound to penetrate into the metamaterial sound absorber;

[0059] The bidirectional metamaterial sound absorber is composed of several juxtaposed and independent resonance units. The resonance behavior of each resonance unit is single-frequency and corresponds to a section of the frequency in the broadband noise to be reduced. The resonance unit achieves the sound absorption effect by converting the noise energy into heat energy and dissipating it; the openings of the resonance units of the bidirectional metamaterial sound absorber face the front waterproof sound-permeable layer and the rear waterproof sound-permeable layer.

[0060] Embodiment 4

[0061] An acoustic metamaterial sound absorption and insulation barrier, as Figure 7 shown, has the same structure as that of Embodiment 1, except that:

[0062] One or more water outlet holes 12 passing through the front porous sound-permeable surface and the waterproof sound-permeable layer are provided at the lower end of the sound absorption and insulation barrier unit for discharging the accumulated water entering the interior of the sound absorption and insulation barrier unit.

[0063] Embodiment 5

[0064] An acoustic metamaterial sound absorption and insulation barrier, as Figure 8 shown, has the same structure as that of Embodiment 1, except that:

[0065] One or more transparent material windows 6 for observation and ventilation channels 7 penetrating the sound-absorbing and sound-insulating barrier unit are provided in the upper, middle or lower part of the sound-absorbing and sound-insulating barrier unit; the front surface at the connection of the transparent material window and the ventilation channel with the sound-absorbing and sound-insulating barrier unit, the outer periphery of the waterproof sound-permeable layer and the rear surface are fixedly connected or sealed, or the front porous sound-permeable surface, the front waterproof sound-permeable layer, the rear waterproof sound-permeable layer and the outer periphery of the rear porous sound-permeable surface at the connection of the transparent material window for observation and the ventilation channel with the sound-absorbing and sound-insulating barrier unit are fixedly connected or sealed; wherein the observation window is made of light-transmitting flexible plastic or rubber material; when the ventilation channel is not in use, it is blocked by flexible material and can be opened and ventilated with a ventilation duct of standard diameter; to meet the safety operation specifications.

[0066] Example 6

[0067] An acoustic metamaterial sound-absorbing and sound-insulating barrier, as Figure 9 , 10 shown, the structure of the sound-absorbing and sound-insulating barrier unit is the same as that in Example 1, the difference is that:

[0068] Several sound-absorbing and sound-insulating barrier units are fixedly connected to form a quadrilateral sound-absorbing and sound-insulating barrier vertical board, and can be connected and fixed with external brackets and the sound-absorbing and sound-insulating barrier units through structures such as binding straps 13 and hooks 14.

[0069] And several sound-absorbing and sound-insulating barrier units fixedly connected can be provided at the top of the vertical board to form a sound-absorbing and sound-insulating barrier inclined board, further increasing the noise reduction effect.

[0070] Example 7

[0071] An acoustic metamaterial sound-absorbing and sound-insulating barrier, as Figure 11 and 12 shown, the structure of the sound-absorbing and sound-insulating barrier unit is the same as that in Example 1, the difference is that:

[0072] The sound-absorbing and sound-insulating barrier is fixed on one or more vertical poles of the water horse barrier 8, and flexible enclosures 9 made of materials such as plastic and rubber can be added under the water horse to prevent noise leakage from other gaps below.

[0073] Example 8

[0074] An acoustic metamaterial sound-absorbing and sound-insulating barrier, as Figure 13 shown, the structure of the sound-absorbing and sound-insulating barrier unit is the same as that in Example 1, the difference is that:

[0075] Several sound-absorbing and sound-insulating barrier units are fixed on a frame to form four side walls of a cuboid, and a horizontal or inclined sound-absorbing and sound-insulating barrier top cover is provided at the top to form a sound-absorbing and sound-insulating cover.

Claims

1. An acoustic metamaterial sound-absorbing and sound-insulating barrier, characterized in that: It is composed of one or more sound-absorbing and noise-insulating barrier units; The sound-absorbing and sound-insulating barrier unit sequentially comprises a front porous sound-permeable surface, a front waterproof sound-permeable layer, one or more metamaterial sound absorbers and a rear sound-insulating surface, the peripheries of the front porous sound-permeable surface, the front waterproof sound-permeable layer and the rear sound-insulating surface are fixedly connected or sealed, and one or more metamaterial sound absorbers are wrapped inside; or, the sound-absorbing and sound-insulating barrier unit sequentially comprises a front porous sound-permeable surface, a front waterproof sound-permeable layer, one or more bidirectional metamaterial sound absorbers, a rear waterproof sound-permeable layer and a rear porous sound-permeable surface, the peripheries of the front porous sound-permeable surface, the front waterproof sound-permeable layer, the rear waterproof sound-permeable layer and the rear porous sound-permeable surface are fixedly connected or sealed, and one or more bidirectional metamaterial sound absorbers are wrapped inside; The porous sound-permeable surface is a porous or mesh structure, and the material is flame-retardant, weather-resistant, and scratch-resistant, and is used to protect the internal materials of the sound-absorbing and noise-insulating barrier unit from damage; The waterproof sound-permeable layer is used to prevent water penetration and dust particles from entering the metamaterial sound absorber or the bidirectional metamaterial sound absorber and allows sound to penetrate into the metamaterial sound absorber; The rear sound insulation surface is a non-porous material layer, which is used to reflect the residual noise that passes through the metamaterial sound absorber and make the residual noise absorbed by the metamaterial sound absorber again.

2. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: The sound transmission loss level of the sound-absorbing and noise-insulating barrier is greater than 22 decibels.

3. The acoustic metamaterial sound absorption and noise insulation barrier according to claim 1, characterized in that: The outer perimeter of the sound-absorbing and noise-insulating barrier unit is fixed with an edging.

4. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: The metamaterial sound absorber or bidirectional metamaterial sound absorber is composed of a plurality of resonance units arranged in parallel and independent of each other, the resonance behavior of each resonance unit is single-frequency and corresponds to a frequency of the broadband noise to be reduced, and the resonance unit achieves the sound absorption effect by converting the noise energy into heat energy and dissipating it; the resonance unit opening of the metamaterial sound absorber faces the front waterproof sound-permeable layer, and the resonance unit opening of the bidirectional metamaterial sound absorber faces the front waterproof sound-permeable layer and the rear waterproof sound-permeable layer; The resonance units include but are not limited to Fabry-Perot resonators, Helmholtz resonators, and resonators with cavities of arbitrary shapes that can absorb noise of a certain frequency range; a plurality of resonance units are arranged into a geometric shape with cavities of the same or different cross-sections, and each cavity is bent and folded on a certain plane or curved surface or in three-dimensional space to form a compact metamaterial sound absorber or a bidirectional metamaterial sound absorber structure.

5. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: The absorption frequency of the metamaterial sound absorber or the bidirectional metamaterial sound absorber includes at least 200-8000 Hz, and the noise reduction coefficient is not less than 0.

9.

6. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: The materials of the waterproof and sound-permeable layer include but are not limited to polytetrafluoroethylene coated fabric, Gore-Tex waterproof fabric, and high-mesh stainless steel wire mesh.

7. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: The porous sound-permeable surface and the waterproof sound-permeable layer do not affect the acoustic performance of the metamaterial sound absorber.

8. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: Connecting parts and / or sealing components are arranged on the periphery of the sound-absorbing and noise-insulating barrier unit.

9. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: One or more water outlets are provided below and / or on the sides of the sound-absorbing and noise-insulating barrier unit to discharge the accumulated water that has entered the sound-absorbing and noise-insulating barrier unit.

10. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: One or more transparent windows for observation and ventilation channels are arranged at the top, middle or bottom of the sound-absorbing and noise-insulating barrier unit, and the ventilation channels can be blocked by movable sound-insulating surfaces; The porous transparent surface at the connection between the observation window or ventilation channel and the sound-absorbing and noise-insulating barrier unit, the waterproof sound-permeable layer and the surrounding of the sound-insulating surface are fixedly connected or sealed.

11. The acoustic metamaterial sound-absorbing and noise-insulating barrier according to claim 1, characterized in that: The sound-absorbing and noise-isolating barrier is fixed on an external supporting structure, and the external supporting structure includes but is not limited to a supporting frame, a crossbar, a water barrier, and a base.

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