Plate-cavity coupling resonance acoustic metamaterial sound insulation structure

Abstract

The utility model discloses a plate-cavity coupling resonance acoustic metamaterial sound insulation structure which comprises a resonance plate and a cavity layer connected with the resonance plate, the side portion and one end portion of the cavity layer are closed, the other end of the cavity layer is open and connected with the resonance plate, and a narrow slit is formed in the resonance plate. A suspension part capable of freely vibrating is formed in a hollow-out and enclosed area of the resonance plate by the narrow slits; according to the utility model, the problems of narrow sound insulation frequency selection range and complex structure size regulation and control of the existing plate-cavity coupling structure are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sound insulation structure technical field especially a board - cavity coupling resonance acoustic metamaterial sound insulation structure. BACKGROUND

[0002] In actual engineering, not only the medium and high frequency noise, but also the low frequency noise. Compared with the medium and high frequency noise, the low frequency noise isolation has always been a problem. Generally speaking, the frequency of low frequency noise is limited to 20Hz at home and abroad, and the sound below 20Hz belongs to the category of infrasound, but when the sound pressure level is high, the human body can also perceive the sound below 20Hz. But because the noise in the infrasound frequency band has less influence on the human body, few people study the isolation of noise in the infrasound frequency band, but the phenomenon of infrasound affecting the human body does exist in actual engineering. Therefore, controlling the low frequency noise in the infrasound frequency band has become an important research topic.

[0003] At present, the sound insulation and sound absorption structures designed based on the resonance principle are emerging in an endless stream. Compared with the traditional sound insulation and sound absorption structures, the resonance sound insulation structure has many superior performances. The resonance sound insulation structure is particularly suitable for the control of low frequency noise, while the traditional sound insulation material is mainly aimed at medium and high frequency noise. Compared with the traditional sound insulation structure, the resonance sound insulation structure can usually control the sound wave of a specific frequency. For the traditional sound insulation structure, according to the mass density theorem, the overall size and thickness of the structure need to be increased by several times while improving the sound insulation, which will lead to the size of the structure for controlling low frequency noise being too large, and the cost being very high. On the contrary, the resonance sound insulation structure designed based on the resonance principle has the advantages of simple structure, thin thickness and light mass.

[0004] The sound insulation structures based on the principle of local resonance currently on the market mainly include thin film type acoustic metamaterials, Helmholtz resonance cavity and sound cavity coupling sound insulation structure. The thin film type acoustic metamaterial is a structure that can realize the regulation and control of specific sound waves by artificially designing microstructure. The structure is mainly composed of a thin film and an additional mass unit, as shown in Figure 1 , wherein A is the additional mass unit, B is the thin film, and C is the support frame. The sound insulation principle is that when the frequency of the sound wave is close to the resonance frequency of the metamaterial structure unit, strong resonance will occur, causing local resonance effect, achieving negative equivalent mass density or negative equivalent modulus, thereby enhancing the sound insulation performance. The main disadvantage of this structure is that the sound insulation effect is limited to a narrow frequency range. At the same time, the design of such high-precision microstructure requires high manufacturing process, especially the control of thin film tension force, and the thin film structure is more prone to damage than other sound insulation structures in engineering application, which may lead to an increase in cost.

[0005] Helmholtz resonator is a kind of classical acoustic structure, which is usually connected with the outside through a narrow neck or small opening by a closed cavity, as shown in Figure 2 The main sound absorption principle is based on resonance phenomenon, the sound wave enters the resonant cavity through the neck, when the frequency of the incident sound wave matches the natural frequency of the resonant cavity, the sound wave excites the air in the neck to vibrate strongly, so that the sound energy is converted into vibration energy and the sound energy is converted into heat energy under the action of friction and viscous force in the narrow neck. By adjusting the diameter d, the length L of the narrow neck and the volume V of the cavity, the natural frequency of the resonant cavity is adjusted. However, in order to realize the absorption of low frequency noise, the size of the resonant cavity needs to be increased accordingly, which may cause the structure to be too large. At the same time, the Helmholtz resonator needs to be designed and manufactured accurately to achieve the expected sound absorption performance, so a complex process may be required to increase the cost.

[0006] In addition, there is also a plate-cavity coupling resonance sound insulation structure, which is a cuboid base, the base is a single direction opening cavity, and a elastic thin plate is tightly attached to the opening direction of the cavity, the elastic thin plate is provided with a plurality of slits, which together form a plate-cavity coupling structure. When the length, width and distribution of the slits are different, the noise of different frequency sound waves can be isolated to achieve better sound insulation effect. The array plate-cavity coupling structure formed by periodically arranging a single plate-cavity coupling structure is shown in Figure 3 , wherein a is the cavity, b is the elastic thin plate, and c is the slit. Under the action of the sound wave with a frequency close to the resonant frequency of the structure, the sound wave entering the cavity is reflected and refracted in the cavity, thereby consuming sound energy. However, this structure also has its inherent shortcomings, that is, only the plate-cavity coupling structure is processed on the existing plate material, and it cannot control the noise in the infrasound frequency band, that is, the frequency selection range of the existing structure is poor, and the size change is complex when changing the plate-cavity coupling structure for specific frequency noise, and it is not easy to process, which will cause a certain increase in cost. SUMMARY

[0007] The utility model discloses a plate-cavity coupling resonance acoustic metamaterial sound insulation structure, which solves the problem of narrow sound insulation frequency selection range of the existing plate-cavity coupling structure and complex structure size regulation.

[0008] To solve the above technical problems, the utility model adopts the technical scheme of a plate-cavity coupling resonance acoustic metamaterial sound insulation structure, which comprises a resonant plate and a cavity layer connected thereto. The cavity layer is closed at the side and one end, and is open at the other end and connected to the resonant plate. The resonant plate is provided with a slit, and the slit forms a freely vibrating suspension part in the hollow enclosed area on the resonant plate.

[0009] Preferably, the resonant plate is made of one of aluminum alloy, iron or stainless steel.

[0010] Preferably, the cavity layer is one of a PLA cavity layer, a wood cavity layer or a plastic cavity layer.

[0011] Preferably, the cavity layer and the resonance plate are connected together by an adhesive or a screw.

[0012] Preferably, the total depth of the hollowed-out portion of the cavity layer is 100 mm.

[0013] Preferably, the cross section of the hollowed-out portion of the cavity layer is a square ring with an outer ring side length of 200 mm and an inner ring side length of 190 mm, and the thickness of the bottom plate at one end of the cavity layer is 10 mm.

[0014] Preferably, the thickness of the resonance plate is 1 mm.

[0015] Preferably, the outer circumferential side length of the resonance plate is greater than or equal to the outer ring side length of the cross section of the hollowed-out portion of the cavity layer.

[0016] Preferably, the narrow slit width is 1 mm.

[0017] Preferably, the overhanging portion on the resonance plate is formed by a series of continuous narrow slits in the center of the resonance plate.

[0018] The utility model discloses beneficial effects:

[0019] 1. The resonance plate in the utility model is the hollowed-out sheet with the overhanging portion in the structure center, because the solid sheet elasticity is poor and the inherent frequency is higher, so as to obtain the elastic sheet with better elasticity and lower inherent frequency, therefore the resonance plate with the overhanging portion is obtained after a series of continuous narrow slits are processed in the center of the sheet, the elastic sheet of the structure has the inherent frequency easy to control and can obtain the resonance plate with the frequency in infrasound frequency range as the first-order inherent frequency, and the structure has the characteristics of easy processing, light weight and high strength. More importantly, the first-order inherent frequency of the plate-cavity coupling resonance structure is closely related to the first-order inherent frequency of the resonance plate, therefore to control the noise of specific frequency, the first-order inherent frequency of the plate-cavity coupling resonance structure needs to correspond to the noise frequency, so the first-order inherent frequency of the resonance plate needs to correspond to the frequency of the noise, therefore the resonance plate has extremely important significance in the plate-cavity coupling resonance structure. At the same time, the plate-cavity coupling resonance structure has better environmental protection performance, because various sound-absorbing cotton and other substances harmful to human body or environment are not contained in the structure design. In addition, the plate-cavity coupling resonance structure is very simple and easy to process, and overcomes the problems of complex traditional sound insulation structure and easy resource waste.

[0020] 2. The plate-cavity coupling resonance structure is composed of a resonance plate and a cavity layer, and the resonance plate and the cavity layer can be made of multiple materials. The structure has more flexibility, is light in weight, high in strength, environmentally friendly, harmless to human health, simple in structure, easy to process, low in cost, and solves the problems of narrow sound insulation frequency selection range and complex structure size control of the existing plate-cavity coupling structure.

[0021] 3. The design concept of the utility model is to combine a Helmholtz resonance cavity and a plate-cavity coupling resonance sound insulation structure, through simple processing and connection, the sound insulation principle of the combined structure is also realized based on the resonance principle, which is closely related to the Helmholtz resonance cavity principle but different, thereby forming a new plate-cavity coupling resonance sound insulation structure, but at the same time overcoming the complexity of the internal structure of the Helmholtz resonance cavity when controlling low-frequency noise, and realizing the movement of the sound insulation frequency range to low frequency, and the structure size is easy to control and the structure processing and installation are simple. The sound insulation amount simulation is carried out by using COMSOL Multiphysics software, the plate-cavity coupling resonance structure has good sound insulation performance for noise of specific frequency in the low-frequency band, and reaches 19.36 dB of sound insulation amount at 16 Hz. In addition, the structure of the utility model has the characteristics of light weight, simple structure, high strength and the like. The utility model can be applied to indoor and outdoor places with high requirements for specific frequency noise, such as machine room, station, hospital, factory, etc. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure schematic diagram of a thin film type acoustic metamaterial;

[0023] Figure 2 is a structure schematic diagram of a single Helmholtz resonance cavity;

[0024] Figure 3 is a structure schematic diagram of a plate-cavity coupling resonance sound insulation structure;

[0025] Figure 4 is an exploded schematic diagram of the utility model;

[0026] Figure 5 is a perspective view of the utility model;

[0027] Figure 6 is an elevation view of the resonance plate;

[0028] Figure 7 is an enlarged view of part of the continuous narrow slit in the resonance plate;

[0029] Figure 8 is a structure schematic diagram of the cavity layer;

[0030] Figure 9 is a schematic view of the cross-sectional dimension of the hollowed-out portion of the cavity layer;

[0031] Figure 10 is a simulation curve diagram of the sound insulation amount when the cavity depth is 80mm and the frequency range is between 10-50Hz under the condition that the first-order natural frequency of the resonance plate is 15.559hz;

[0032] Figure 11 is a simulation curve diagram of the sound insulation amount when the cavity depth is 100mm and the frequency range is between 10-50Hz under the condition that the first-order natural frequency of the resonance plate is 15.559hz;

[0033] Figure 12 is a simulation curve diagram of the sound insulation amount when the cavity depth is 120mm and the frequency range is between 10-50Hz under the condition that the first-order natural frequency of the resonance plate is 15.559hz;

[0034] Figure 13 is a simulation curve diagram of the sound insulation amount when the cavity depth is 100mm and the frequency range is between 25-75Hz under the condition that the first-order natural frequency of the resonance plate is 49.472hz;

[0035] Figure 14 is a simulation curve diagram of the sound insulation amount when the cavity depth is 100mm and the frequency range is between 75-125Hz under the condition that the first-order natural frequency of the resonance plate is 99.456hz;

[0036] Figure 15 is a simulation curve diagram of the sound insulation amount when the cavity depth is 100mm and the frequency range is between 160-210Hz under the condition that the first-order natural frequency of the resonance plate is 201.13hz;

[0037] Figure 16 is a simulation curve diagram of the sound insulation amount when the cavity depth is 100mm and the frequency range is between 400-450Hz under the condition that the first-order natural frequency of the resonance plate is 402.75hz. DETAILED DESCRIPTION

[0038] The utility model will be described in further detail below in combination with the drawings and specific embodiments.

[0039] As Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown in the drawings, a plate-cavity coupled resonant acoustic metamaterial sound insulation structure includes a resonant plate 1 and a cavity layer 2 connected thereto. The cavity layer 2 is closed at the side and one end, and is open at the other end and connected to the resonant plate 1. The resonant plate 1 is provided with a narrow slit 1.1. The narrow slit 1.1 forms a suspended part 1.2 that can freely vibrate in the hollow enclosed area on the resonant plate 1. The suspended part 1.2 on the resonant plate 1 is a thin plate part similar to a cantilever beam structure formed by cutting a series of continuous narrow slits 1.1 in the center of the resonant plate 1. The resonant plate 1 and the cavity layer 2 are directly connected, and the suspended part 1.2 of the resonant plate 1 does not have any form of contact with any other part, so as to ensure the free vibration of the suspended part 1.2.

[0040] Preferably, the resonant plate 1 is one of an aluminum alloy, iron or stainless steel material. That is, the resonant plate 1 can adopt a metal material plate with certain strength, smooth surface and non-decorative.

[0041] Preferably, the cavity layer 2 is one of a PLA cavity layer, a wooden cavity layer or a plastic cavity layer.

[0042] Preferably, the cavity layer 2 and the resonant plate 1 are connected together by an adhesive or a screw. The adhesive can be a general adhesive or an environmentally friendly adhesive, such as an epoxy resin adhesive, an acrylic structural adhesive, a quick-drying adhesive, a UV adhesive, a metal bonding acrylic ester adhesive and the like.

[0043] Preferably, the total depth of the hollow part of the cavity layer 2 is 100 mm. When the depth of the cavity in the embodiment (i.e. the total thickness of the cavity layer after removing the bottom solid part) is different, the sound insulation amount corresponding to the sound insulation peak near the resonant frequency in the sound insulation amount simulation curve is slightly different when the structural parameters of the resonant plate 1 and the cavity layer 2 except the cavity depth are unchanged. After several sound insulation amount simulations, it is proved that when the cavity depth is 100 mm, the sound insulation amount corresponding to the sound insulation peak near the resonant frequency in the sound insulation amount simulation curve reaches the maximum value, and the cross-sectional size of the hollow part of the cavity layer 2 can only have no overlapping part with the projection of the suspended part 1.2 of the resonant plate 1 in the vertical direction.

[0044] Preferably, the cross section of the hollow part of the cavity layer 2 is a square ring with an outer ring side length of 200 mm and an inner ring side length of 190 mm, and the thickness of the bottom plate at one end of the cavity layer 2 is 10 mm. Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 and Figure 9 As shown in the drawings, one end of the cavity layer 2 is a sealed structure, and the thickness of the sealed part is 10 mm. The cross-sectional size of the hollow part is a square with a side length of 200 mm minus the remaining part of a concentric square with a side length of 190 mm. ​​​​

[0045] Preferably, the thickness of the resonance plate 1 is 1mm.

[0046] Preferably, the width of the narrow slit 1.1 is 1mm. Figure 7 As shown in the embodiment, the width of the narrow slit constituting the overhanging part in the resonance plate 1 is 1mm.

[0047] Preferably, the outer circumferential length of the resonance plate 1 is greater than or equal to the outer circumferential length of the hollowed-out section of the cavity layer 2.

[0048] Preferably, the overhanging part 1.2 on the resonance plate 1 is surrounded by a series of continuous narrow slits 1.1 in the center of the resonance plate 1. The narrow slits 1.1 dividing the overhanging part 1.2 on the resonance plate 1 in the embodiment can be combined to form various patterns. The shape of the overhanging part 1.2 on the resonance plate 1 varies in many ways.

[0049] The working principle of the utility model is as follows: the resonance plate 1 and the cavity layer 2 are connected together to form a plate-cavity coupled resonance sound insulation structure. The overhanging part 1.2 in the resonance plate 1 is equivalent to the elastic plate part in the plate-cavity coupled structure, and when the resonance plate 1 is combined with the cavity layer 2, it is equivalent to a plate-cavity coupled resonance sound insulation structure, which conforms to the sound insulation principle of the plate-cavity coupled resonance structure. Under the action of sound waves, the sound waves entering the cavity interior continuously reflect, refract and scatter in the area between the cavity and the resonance plate. At the same time, when the frequency of the incident sound wave corresponds to the resonance frequency of the plate-cavity coupled resonance structure, the air in the plate and the cavity will produce strong vibration due to resonance, thereby consuming sound energy, and further reducing the sound wave energy transmitted to the other side.

[0050] Example 1 (see Figure 10 ): Figure 10 The horizontal coordinate represents frequency, unit: hertz (Frequency / Hz), the vertical coordinate represents sound insulation, unit: decibel (Sound Transimission Loss / dB), same below;

[0051] The plate-cavity coupled resonance acoustic metamaterial sound insulation structure comprises a resonance plate 1 and a cavity layer 2, which are combined by adhesive or screws;

[0052] The first-order natural frequency of the resonant plate used in this embodiment is 15.559 hz, the second-order natural frequency is 20.58 hz, the thickness is 1 mm, the cavity depth of the resonant cavity without the thickness of the bottom plate is 80 mm, the wall thickness of the hollow part of the cavity layer is 5 mm, and the thickness of the bottom plate of the cavity layer is 10 mm. The resonant plate is made of aluminum alloy plate, and the cavity layer is made of PLA material. The resonant plate and the cavity layer are directly connected and fixed. Through sound insulation simulation, the sound insulation reaches 17.19 dB at a frequency of 16 hz, and the sound insulation reaches 20.59 at a frequency of 20.9 hz. Because the second-order natural frequency of the resonant plate is low, the second-order natural frequency of this structure is also excited to produce sound insulation effect.

[0053] Example 2 (see Figure 11 ) :

[0054] The plate-cavity coupled resonant acoustic metamaterial sound insulation structure includes a resonant plate 1 and a cavity layer 2, which are combined by adhesive or screws;

[0055] The first-order natural frequency of the resonant plate used in this embodiment is 15.559 hz, the second-order natural frequency is 20.58 hz, the thickness is 1 mm, the cavity depth of the resonant cavity without the thickness of the bottom plate is 100 mm, the wall thickness of the hollow part of the cavity layer is 5 mm, and the thickness of the bottom plate of the cavity layer is 10 mm. The resonant plate is made of aluminum alloy plate, and the cavity layer is made of PLA material. The resonant plate and the cavity layer are directly connected and fixed. Through sound insulation simulation, the sound insulation reaches 19.36 dB at a frequency of 16 hz, and the sound insulation reaches 15.09 dB at a frequency of 20.8 hz. Because the second-order natural frequency of the resonant plate is low, the second-order natural frequency of this structure is also excited to produce sound insulation effect.

[0056] Example 3 (see Figure 12 ) :

[0057] The plate-cavity coupled resonant acoustic metamaterial sound insulation structure includes a resonant plate 1 and a cavity layer 2, which are combined by adhesive or screws;

[0058] The first-order natural frequency of the resonant plate used in this embodiment is 15.559 hz, the second-order natural frequency is 20.58 hz, the thickness is 1 mm, the cavity depth of the resonant cavity without the thickness of the bottom plate is 120 mm, the wall thickness of the hollow part of the cavity layer is 5 mm, and the thickness of the bottom plate of the cavity layer is 10 mm. The resonant plate is made of aluminum alloy plate, and the cavity layer is made of PLA material. The resonant plate and the cavity layer are directly connected and fixed. Through sound insulation simulation, the sound insulation reaches 15.99 dB at a frequency of 16 hz, and the sound insulation reaches 15.39 dB at a frequency of 20.9 hz. Because the second-order natural frequency of the resonant plate is low, the second-order natural frequency of this structure is also excited to produce sound insulation effect.

[0059] Example 4 (seeFigure 13

[0060] The plate-cavity coupled resonant acoustic metamaterial sound insulation structure comprises a resonant plate and a cavity layer, which are combined by an adhesive or a screw;

[0061] The first-order natural frequency of the resonant plate used in the embodiment is 49.472 hz, the thickness is 1 mm, the cavity depth of the resonant cavity without the thickness of the bottom plate is 100 mm, the wall thickness of the hollow part of the cavity layer is 5 mm, and the thickness of the bottom plate of the cavity layer is 10 mm. The resonant plate is selected from an aluminum alloy plate, and the cavity layer is selected from a PLA material. The resonant plate and the cavity layer are directly connected and fixed in contact. Through sound insulation simulation, the sound insulation reaches 25.5 dB at a frequency of 52.5 hz.

[0062] Example 5 (see Figure 14

[0063] The plate-cavity coupled resonant acoustic metamaterial sound insulation structure comprises a resonant plate and a cavity layer, which are combined by an adhesive or a screw;

[0064] The first-order natural frequency of the resonant plate used in the embodiment is 99.456 hz, the thickness is 1 mm, the cavity depth of the resonant cavity without the thickness of the bottom plate is 100 mm, the wall thickness of the hollow part of the cavity layer is 5 mm, and the thickness of the bottom plate of the cavity layer is 10 mm. The resonant plate is selected from an aluminum alloy plate, and the cavity layer is selected from a PLA material. The resonant plate and the cavity layer are directly connected and fixed in contact. Through sound insulation simulation, the sound insulation reaches 37.78 dB at a frequency of 108.2 hz.

[0065] Example 6 (see Figure 15

[0066] The plate-cavity coupled resonant acoustic metamaterial sound insulation structure comprises a resonant plate and a cavity layer, which are combined by an adhesive or a screw;

[0067] The first-order natural frequency of the resonant plate used in the embodiment is 201.13 hz, the thickness is 2 mm, the cavity depth of the resonant cavity without the thickness of the bottom plate is 100 mm, the wall thickness of the hollow part of the cavity layer is 5 mm, and the thickness of the bottom plate of the cavity layer is 10 mm. The resonant plate is selected from an aluminum alloy plate, and the cavity layer is selected from a PLA material. The resonant plate and the cavity layer are directly connected and fixed in contact. Through sound insulation simulation, the sound insulation reaches 37.3 dB at a frequency of 185.7 hz.

[0068] Example 7 (see Figure 16

[0069] The plate-cavity coupled resonant acoustic metamaterial sound insulation structure comprises a resonant plate and a cavity layer, which are combined by an adhesive or a screw;

[0070] ​​​​The first natural frequency of the resonant plate is 402.75 hz, the thickness is 4 mm, the cavity depth of the resonant cavity without the bottom plate thickness is 100 mm, the wall thickness of the hollow part of the cavity layer is 5 mm, and the bottom plate thickness of the cavity layer is 10 mm. The resonant plate is selected from an aluminum alloy plate, and the cavity layer is selected from a PLA material. The resonant plate and the cavity layer are directly connected and fixed in contact. Through sound insulation simulation, the sound insulation quantity reaches 41.4 dB at a frequency of 425.1 hz.

[0071] The above examples are only preferred technical solutions of the present application, and should not be regarded as limiting the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, including equivalent replacement schemes of the technical features in the technical solutions claimed in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A plate-cavity coupled resonant acoustic metamaterial sound insulation structure, comprising a resonant plate (1) and a cavity layer (2) connected thereto, characterized in that: The cavity layer (2) is closed on one side and one end, and open at the other end and connected to the resonant plate (1). A narrow slit (1.1) is provided on the resonant plate (1). The narrow slit (1.1) forms a suspension part (1.2) that can vibrate freely in the hollowed-out area of ​​the resonant plate (1).

2. The plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1, characterized in that: The resonant plate (1) is made of aluminum alloy, iron or stainless steel.

3. The plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1, characterized in that: The cavity layer (2) is one of PLA cavity layer, wood cavity layer or plastic cavity layer.

4. The plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1, characterized in that: The cavity layer (2) is connected to the resonant plate (1) by adhesive or screws.

5. The plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1, characterized in that: The total depth of the hollow portion of the cavity layer (2) is 100mm.

6. A plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1 or 5, characterized in that: The hollow part of the cavity layer (2) has a cross-section of a square ring with an outer ring side length of 200mm and an inner ring side length of 190mm. The thickness of the bottom plate at one end of the cavity layer (2) is 10mm.

7. The plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1, characterized in that: The thickness of the resonant plate (1) is 1 mm.

8. A plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1 or 7, characterized in that: The outer perimeter of the resonant plate (1) is greater than or equal to the outer ring side length of the hollow section of the cavity layer (2).

9. The plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1, characterized in that: The slit (1.1) has a width of 1 mm.

10. The plate-cavity coupled resonant acoustic metamaterial sound insulation structure according to claim 1, characterized in that: The suspension portion (1.2) on the resonant plate (1) is surrounded by a series of continuous narrow slits (1.1) in the center of the resonant plate (1).

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