Variable-stiffness super-structure sound insulation board

Abstract

The invention relates to a variable-rigidity super-structure sound insulation board which comprises an outer side panel, a damping layer, a middle partition plate, a porous sound absorption layer and an inner side panel which are sequentially connected in a stacked mode from outside to inside. An air layer is arranged between the two damping layers; a first rib assembly is arranged in the air layer, and a second rib assembly and a third rib assembly are arranged in the porous sound absorption layer; the first rib assembly comprises a plurality of transverse ribs and longitudinal ribs which are mutually crossed and fixed, and a plurality of columns of small ribs which are differentially distributed on the transverse ribs and / or the longitudinal ribs; the structure of the third rib assembly is consistent with that of the first rib assembly, ribs of the third rib assembly are inserted into the porous sound absorption layer, and the insertion depth is 10%-90% of the thickness of the porous sound absorption layer; the first rib assembly, the second rib assembly and the third rib assembly jointly form a variable stiffness system. Compared with the prior art, the method has the advantages that the broadband sound insulation performance is improved, and the sound insulation valley is filled; the method is suitable for wide application scenes; sound insulation, vibration reduction and sound absorption are synergistically optimized.

Description

Technical Field

[0001] This invention relates to the field of sound insulation technology, and in particular to a variable stiffness superstructure sound insulation panel. Background Technology

[0002] Sound insulation panels, as functional noise reduction components, are widely used in construction, industrial equipment, and other fields. Their core requirement is to effectively isolate sound across a wide frequency range, especially low- and mid-frequency noise. Existing sound insulation panels typically employ a multi-layered structure supported by uniformly stiff ribs, or achieve sound insulation through simple layering designs, which has the following drawbacks: The uniform stiffness distribution of the rib structure makes it difficult to adapt to the vibration characteristics of different frequencies of sound, and the damping and isolation effect on mid- and low-frequency noise is limited, which easily leads to a trough in sound insulation. The lack of optimized design in the rib layout and poor synergy with the sound insulation layer make it impossible to effectively improve the overall structural stability and difficult to achieve broadband sound insulation optimization through stiffness gradient. The connection between the functional layers is simple, which makes it easy for misalignment and loosening to occur, affecting long-term sound insulation performance and structural durability; The panel material selection is limited, mostly to a single metal material, making it difficult to flexibly adapt to the needs of different application scenarios (such as lightweight, corrosion resistance, high strength, etc.), thus limiting the applicability of sound insulation panels.

[0003] Therefore, designing a sound insulation panel that adapts to broadband noise characteristics through a variable stiffness system structure, while expanding the selection of panel alloy materials and taking into account structural stability and ease of installation, has become the key to solving the shortcomings of existing technologies. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a variable stiffness metastructure sound insulation board that improves broadband sound insulation performance, fills the gap in sound insulation, is suitable for a wide range of application scenarios, and optimizes sound insulation, vibration reduction and sound absorption in a coordinated manner, with a stable connection.

[0005] The objective of this invention can be achieved through the following technical solutions: This invention provides a variable stiffness superstructure sound insulation panel, comprising an outer panel, a damping layer, a middle partition, a porous sound-absorbing layer, and an inner panel that are stacked and connected sequentially from the outside to the inside; an air layer is provided between the two damping layers; The air layer is provided with a first rib assembly, and the porous sound-absorbing layer is provided with a second rib assembly and a third rib assembly. The first rib assembly includes multiple cross and longitudinal ribs that are fixed to each other, as well as multiple rows of small ribs that are differentially distributed on the cross and / or longitudinal ribs. At least one parameter of the length, width and height of the small ribs is adjustable, thereby forming a gradient variable stiffness structure in the air layer. The structure of the third rib assembly is the same as that of the first rib assembly. The ribs of the third rib assembly are inserted into the porous sound-absorbing layer to a depth of 10% to 90% of the thickness of the porous sound-absorbing layer. The second rib assembly has more horizontal and vertical ribs than the third rib assembly, and each rib is offset in the plane relative to the corresponding rib of the third rib assembly and inserted into the porous sound-absorbing layer. The insertion depth is 10% to 90% of the thickness of the porous sound-absorbing layer, and the insertion depth is not greater than the thickness of the porous sound-absorbing layer minus the insertion depth of the third rib assembly. The first rib assembly, the second rib assembly, and the third rib assembly together constitute a variable stiffness system, which is used to adapt to the vibration characteristics of broadband noise and improve the sound insulation effect in the mid and low frequencies.

[0006] Furthermore, the outer panel has a thickness of 1~10mm, the damping layer has a thickness of 1~20mm, the middle partition has a thickness of 1~50mm, the porous sound-absorbing layer has a thickness of 20~200mm, the inner panel has a thickness of 1~10mm, and the overall thickness of the variable stiffness superstructure sound insulation board is 20~300mm.

[0007] Furthermore, the outer panel, the middle partition, and the inner panel are made of an alloy, which is selected from aluminum alloy, stainless steel, magnesium alloy, titanium alloy, or copper alloy.

[0008] Furthermore, the aluminum alloy is 6061 aluminum alloy or 5052 aluminum alloy; the stainless steel is 304 stainless steel or 201 stainless steel; and the copper alloy is H62 brass.

[0009] 6061 aluminum alloy: It combines lightweight, corrosion resistance and good machinability, making it suitable for applications where weight and corrosion resistance are required. 304 stainless steel: It has excellent corrosion resistance and mechanical strength, and is suitable for humid and corrosive environments or industrial scenarios with high strength requirements. H62 Brass: Excellent acoustic performance and good damping characteristics, which can further improve the sound insulation and vibration reduction effect, and is suitable for scenarios with strict acoustic performance requirements. Q235 low alloy steel: high strength and low cost, suitable for construction scenarios where cost is sensitive and high strength is required; 5052 aluminum alloy: has better corrosion resistance than 6061 aluminum alloy, good toughness, and is suitable for outdoor or humid environments; 201 stainless steel: High cost performance, good corrosion resistance, suitable for general applications where both cost and corrosion resistance are required.

[0010] Furthermore, the damping layer is made of a polymer damping material, selected from one of butyl rubber damping materials, asphalt-based damping materials, water-based acrylic damping coatings, polyurethane damping materials, or nitrile rubber damping composite materials.

[0011] Butyl rubber-based damping material: high damping loss factor, excellent vibration reduction effect, suitable for conventional noise reduction scenarios in medium and low temperature environments; Asphalt-based damping materials: low cost, good temperature resistance (-20℃~80℃), suitable for cost-sensitive sound insulation applications in buildings and equipment; Water-based acrylic damping coating: environmentally friendly and pollution-free, easy to apply, can be cured at room temperature, suitable for indoor and environmentally friendly scenarios; Polyurethane damping material: It has good flexibility and strong adhesion to metal panels, making it suitable for soundproof enclosures of equipment with severe vibration. Nitrile rubber damping composite material: Excellent oil resistance and wear resistance, suitable for sound insulation in industrial oily environments.

[0012] Furthermore, the porous sound-absorbing layer is made of a porous sound-absorbing material, selected from glass wool, rock wool, polyester fiber cotton, melamine cotton, or polyimide foam.

[0013] Glass wool: High sound absorption efficiency, fireproof and flame retardant, wide temperature range (-120℃~400℃), suitable for industrial scenarios with high temperature and high fire protection requirements; Rock wool: High temperature resistance (-260℃~600℃), excellent flame retardancy, good chemical stability, suitable for extreme working conditions such as high temperature kilns and boilers; Polyester fiber cotton: environmentally friendly and non-toxic, soft to the touch, with stable sound absorption performance, suitable for indoor buildings, offices and other scenarios where environmental protection and comfort are required; Melamine cotton: Lightweight and high-strength, integrating sound absorption, heat insulation and flame retardancy, suitable for sound insulation of precision equipment and cold chain environment; Polyimide foam: Resistant to ultra-high temperatures (-200℃~300℃), radiation resistant, and with excellent sound absorption properties, it is suitable for special high-temperature scenarios such as aerospace and nuclear industry.

[0014] Furthermore, the outer panel is fixedly connected to the damping layer by an adhesive; the middle partition is fixedly connected to the porous sound-absorbing layer, and the porous sound-absorbing layer is fixedly connected to the inner panel by damping adhesive.

[0015] Furthermore, when the porous sound-absorbing layer is made of glass wool or rock wool, an auxiliary fixing component is also provided. The auxiliary fixing component cooperates with the second rib assembly and / or the third rib assembly to limit the position of the porous sound-absorbing layer.

[0016] Furthermore, the first rib assembly is welded to or integrally formed with the outer panel and / or the middle partition; the second rib assembly and the third rib assembly are welded to or integrally formed with the middle partition and / or the inner panel; the small ribs in each assembly are fixed perpendicularly to the main ribs.

[0017] Furthermore, the small ribs in the first rib assembly include at least two columns, with each column of small ribs evenly distributed along the height direction of the air layer.

[0018] When applied, this invention causes the outer panel to vibrate upon impact with sound waves. At this time, the damping layer and the intermediate partition are continuously stressed, effectively converting the mechanical energy of the sound waves into heat energy, reducing the propagation energy of the sound waves, and thus achieving sound insulation. Specifically, due to the non-uniform distribution of ribs and small ribs within the air layer and porous sound-absorbing layer, the damping layer and intermediate partition can selectively absorb sound waves in certain frequency ranges, especially in the low-frequency range. This selective absorption effect is particularly significant, enabling the structure of this invention not only to improve sound insulation but also to achieve differentiated isolation of sound waves in different frequency ranges, ensuring sound insulation in the mid-to-high frequencies while playing a crucial role in limiting low frequencies. Furthermore, the air cavity structure formed by the damping layer and porous sound-absorbing layer itself allows sound waves to undergo multiple reflections and scatterings during propagation, thereby reducing sound energy. This structure significantly improves broadband sound insulation performance while maintaining lightweight design and structural strength.

[0019] Compared with the prior art, the present invention has the following advantages: (1) Improve broadband sound insulation performance and fill the sound insulation trough. The variable stiffness system structure solves the problem of the "sound insulation trough" in traditional sound insulation panels. Traditional uniform stiffness structures are difficult to match the complex vibration characteristics of broadband noise, resulting in a sharp drop in sound insulation effect in certain frequency bands (especially mid-low frequency). By setting the first stiffener assembly in the air layer and setting the second and third stiffener assemblies alternately in the porous sound-absorbing layer, a non-uniform, gradient stiffness distribution is formed. This design can be specifically adapted to different noise vibration characteristics from low frequency to high frequency. When sound waves act on the sound insulation panel, the variable stiffness system can effectively disperse and consume sound wave energy, especially significantly improving the damping and isolation effect on mid-low frequency noise, thereby achieving a smooth and efficient broadband sound insulation curve.

[0020] (2) Adaptable to a wide range of application scenarios. A variety of materials are available for the panel, damping layer and porous sound-absorbing layer. The outer panel, middle partition and inner panel can be made of different alloy materials according to different scenario requirements (such as lightweight, corrosion resistance, high strength and cost control); the damping layer can be made of the most suitable material according to noise characteristics, ambient temperature and environmental protection requirements; the porous sound-absorbing layer material selection covers various needs from room temperature to ultra-high temperature, from ordinary buildings to special industries.

[0021] (3) Sound insulation, vibration reduction and sound absorption are optimized in a coordinated manner, and the connection is stable. The sound wave passes through the surface density sound insulation of the outer panel, the vibration energy absorption of the damping layer, the acoustic impedance matching and blocking of the variable stiffness structure of the air layer, the re-reflection of the middle partition, and the final sound absorption and energy dispersion of the porous sound-absorbing layer and the internal rib system, forming a highly efficient multi-level noise treatment channel. Under the premise of maintaining lightweight and structural strength, the structure achieves maximum attenuation of sound wave energy through the synergistic effect of each part, especially playing a limiting role in low-frequency sound waves, and ultimately improving the overall broadband sound insulation performance.

[0022] The layers are fixedly connected using adhesives, damping glues, etc., ensuring the integrity and airtightness of the structure. Integrated ribs: The first, second, and third rib assemblies are all connected to the corresponding layer panels by welding or integral molding. Small ribs are perpendicularly intersecting and fixed to the main ribs, forming a stable skeletal support. Attached Figure Description

[0023] Figure 1 A schematic diagram of a variable stiffness metastructure sound insulation panel; Figure 2 This is a structural schematic diagram of the first rib assembly (with two rows of small ribs). Figure 3 This is a comparison chart of the sound insulation of Example 2 and a 75mm double-layer composite cement board.

[0024] Reference numerals: 1-Outer panel; 2-Damping layer; 3-Air layer; 4-Intermediate partition; 5-Porous sound-absorbing layer; 6-Inner panel; 7-First rib assembly; 8-Second rib assembly; 9-Third rib assembly; 71-First row of small ribs; 72-Second row of small ribs. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0026] Example 1 This embodiment provides a variable stiffness metastructure sound insulation panel, such as Figure 1 , 2 As shown, it includes an outer panel 1, a damping layer 2, a middle partition 4, a porous sound-absorbing layer 5, and an inner panel 6, which are stacked and connected sequentially from the outside to the inside; an air layer 3 is provided between the two damping layers. The air layer 3 is provided with a first rib assembly 7, and the porous sound-absorbing layer 5 is provided with a second rib assembly 8 and a third rib assembly 9. The first rib assembly 7 includes multiple cross-fixed transverse and longitudinal ribs, as well as multiple rows of small ribs differentially distributed on the cross and / or longitudinal ribs. At least one parameter of the length, width and height of the small ribs is adjustable, thereby forming a gradient variable stiffness structure within the air layer 3. The structure of the third rib assembly 9 is the same as that of the first rib assembly 7. The ribs of the third rib assembly 9 are inserted into the porous sound-absorbing layer 5, and the insertion depth is 10% to 90% of the thickness of the porous sound-absorbing layer 5. The second rib assembly 8 has more horizontal and vertical ribs than the third rib assembly 9, and each rib is offset in the plane relative to the corresponding rib of the third rib assembly 9, and is inserted into the porous sound-absorbing layer 5. The insertion depth is 10% to 90% of the thickness of the porous sound-absorbing layer 5, and the insertion depth is not greater than the thickness of the porous sound-absorbing layer 5 minus the insertion depth of the third rib assembly 9. The first stiffener assembly 7, the second stiffener assembly 8, and the third stiffener assembly 9 together constitute a variable stiffness system, which is used to adapt to the vibration characteristics of broadband noise and improve the sound insulation effect in the mid and low frequencies.

[0027] In a specific embodiment, the small ribs in the first rib assembly 7 include at least two columns, and each column of small ribs is equally spaced along the height direction of the air layer 3.

[0028] Example 2 This embodiment provides a variable stiffness metastructure sound insulation panel, such as Figure 1 , 2 As shown, it includes an outer panel 1, a damping layer 2, a middle partition 4, a porous sound-absorbing layer 5, and an inner panel 6, which are stacked and connected sequentially from the outside to the inside; an air layer 3 is provided between the two damping layers. The air layer 3 is provided with a first rib assembly 7, and the porous sound-absorbing layer 5 is provided with a second rib assembly 8 and a third rib assembly 9. The first rib assembly 7 includes multiple cross-fixed transverse and longitudinal ribs, as well as multiple rows of small ribs differentially distributed on the cross and / or longitudinal ribs. At least one parameter of the length, width and height of the small ribs is adjustable, thereby forming a gradient variable stiffness structure within the air layer 3. The structure of the third rib assembly 9 is the same as that of the first rib assembly 7. The ribs of the third rib assembly 9 are inserted into the porous sound-absorbing layer 5, and the insertion depth is 10% to 90% of the thickness of the porous sound-absorbing layer 5. The second rib assembly 8 has more horizontal and vertical ribs than the third rib assembly 9, and each rib is offset in the plane relative to the corresponding rib of the third rib assembly 9, and is inserted into the porous sound-absorbing layer 5. The insertion depth is 10% to 90% of the thickness of the porous sound-absorbing layer 5, and the insertion depth is not greater than the thickness of the porous sound-absorbing layer 5 minus the insertion depth of the third rib assembly 9. The first stiffener assembly 7, the second stiffener assembly 8, and the third stiffener assembly 9 together constitute a variable stiffness system, which is used to adapt to the vibration characteristics of broadband noise and improve the sound insulation effect in the mid and low frequencies.

[0029] In a specific embodiment, the outer panel 1 has a thickness of 1~10mm, the damping layer 2 has a thickness of 1~20mm, the middle partition 4 has a thickness of 1~50mm, the porous sound-absorbing layer 5 has a thickness of 20~200mm, the inner panel 6 has a thickness of 1~10mm, and the overall thickness of the variable stiffness superstructure sound insulation board is 20~300mm.

[0030] In a specific embodiment, the outer panel 1, the middle partition 4, and the inner panel 6 are made of an alloy, which is selected from aluminum alloy, stainless steel, magnesium alloy, titanium alloy, or copper alloy.

[0031] In a specific embodiment, the aluminum alloy is 6061 aluminum alloy or 5052 aluminum alloy; the stainless steel is 304 stainless steel or 201 stainless steel; and the copper alloy is H62 brass.

[0032] 6061 aluminum alloy: It combines lightweight, corrosion resistance and good machinability, making it suitable for applications where weight and corrosion resistance are required. 304 stainless steel: It has excellent corrosion resistance and mechanical strength, and is suitable for humid and corrosive environments or industrial scenarios with high strength requirements. H62 Brass: Excellent acoustic performance and good damping characteristics, which can further improve the sound insulation and vibration reduction effect, and is suitable for scenarios with strict acoustic performance requirements. Q235 low alloy steel: high strength and low cost, suitable for construction scenarios where cost is sensitive and high strength is required; 5052 aluminum alloy: has better corrosion resistance than 6061 aluminum alloy, good toughness, and is suitable for outdoor or humid environments; 201 stainless steel: High cost performance, good corrosion resistance, suitable for general applications where both cost and corrosion resistance are required.

[0033] In a specific embodiment, the damping layer 2 is made of a polymer damping material, selected from one of butyl rubber damping materials, asphalt-based damping materials, water-based acrylic damping coatings, polyurethane damping materials, or nitrile rubber damping composite materials.

[0034] Butyl rubber-based damping material: high damping loss factor, excellent vibration reduction effect, suitable for conventional noise reduction scenarios in medium and low temperature environments; Asphalt-based damping materials: low cost, good temperature resistance (-20℃~80℃), suitable for cost-sensitive sound insulation applications in buildings and equipment; Water-based acrylic damping coating: environmentally friendly and pollution-free, easy to apply, can be cured at room temperature, suitable for indoor and environmentally friendly scenarios; Polyurethane damping material: It has good flexibility and strong adhesion to metal panels, making it suitable for soundproof enclosures of equipment with severe vibration. Nitrile rubber damping composite material: Excellent oil resistance and wear resistance, suitable for sound insulation in industrial oily environments.

[0035] In a specific embodiment, the porous sound-absorbing layer 5 is made of a porous sound-absorbing material, selected from glass wool, rock wool, polyester fiber cotton, melamine cotton or polyimide foam.

[0036] Glass wool: High sound absorption efficiency, fireproof and flame retardant, wide temperature range (-120℃~400℃), suitable for industrial scenarios with high temperature and high fire protection requirements; Rock wool: High temperature resistance (-260℃~600℃), excellent flame retardancy, good chemical stability, suitable for extreme working conditions such as high temperature kilns and boilers; Polyester fiber cotton: environmentally friendly and non-toxic, soft to the touch, with stable sound absorption performance, suitable for indoor buildings, offices and other scenarios where environmental protection and comfort are required; Melamine cotton: Lightweight and high-strength, integrating sound absorption, heat insulation and flame retardancy, suitable for sound insulation of precision equipment and cold chain environment; Polyimide foam: Resistant to ultra-high temperatures (-200℃~300℃), radiation resistant, and with excellent sound absorption properties, it is suitable for special high-temperature scenarios such as aerospace and nuclear industry.

[0037] In a specific embodiment, the outer panel 1 and the damping layer 2 are fixedly connected by an adhesive; the middle partition 4 and the porous sound-absorbing layer 5, as well as the porous sound-absorbing layer 5 and the inner panel 6, are fixedly connected by damping glue.

[0038] In a specific embodiment, when the porous sound-absorbing layer 5 is made of glass wool or rock wool, an auxiliary fixing component is also provided. The auxiliary fixing component cooperates with the second rib assembly 8 and / or the third rib assembly 9 to limit the position of the porous sound-absorbing layer 5.

[0039] In a specific embodiment, the first rib assembly 7 is welded to or integrally formed with the outer panel 1 and / or the middle partition 4; the second rib assembly 8 and the third rib assembly 9 are welded to or integrally formed with the middle partition 4 and / or the inner panel 6; the small ribs in each assembly are fixed perpendicularly to the main ribs.

[0040] In a specific embodiment, the small ribs in the first rib assembly 7 include three rows, and each row of small ribs is equally spaced along the height direction of the air layer 3; The first column has multiple small ribs 71, and the lengths of the upper and lower small ribs are variable; The second column has multiple small reinforcing bars 72, with variable lengths; The third column has multiple small ribs, the width and height of which are variable.

[0041] Figure 3 This is a comparison chart of the sound insulation of this embodiment and a 75mm double-layer composite cement board. The sound insulation of this embodiment is better than that of the existing structure in all frequency bands.

[0042] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0043] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A variable stiffness metastructure sound insulation panel, characterized in that, It includes an outer panel (1), a damping layer (2), a middle partition (4), a porous sound-absorbing layer (5), and an inner panel (6) that are stacked and connected sequentially from the outside to the inside; an air layer (3) is provided between the two damping layers. The air layer (3) is provided with a first rib assembly (7), and the porous sound-absorbing layer (5) is provided with a second rib assembly (8) and a third rib assembly (9). The first rib assembly (7) includes multiple cross and longitudinal ribs that are fixed to each other, and multiple rows of small ribs distributed on the cross and / or longitudinal ribs. At least one parameter of the length, width and height of the small ribs is adjustable, thereby forming a gradient variable stiffness structure in the air layer (3). The structure of the third rib assembly (9) is the same as that of the first rib assembly (7). The ribs of the third rib assembly (9) are inserted into the porous sound-absorbing layer (5) to a depth of 10% to 90% of the thickness of the porous sound-absorbing layer (5). The second rib assembly (8) has more horizontal and vertical ribs than the third rib assembly (9), and each rib is offset in the plane relative to the corresponding rib of the third rib assembly (9) and inserted into the porous sound-absorbing layer (5) at a depth of 10% to 90% of the thickness of the porous sound-absorbing layer (5), and the insertion depth is not greater than the thickness of the porous sound-absorbing layer (5) minus the insertion depth of the third rib assembly (9); The first stiffener assembly (7), the second stiffener assembly (8), and the third stiffener assembly (9) together constitute a variable stiffness system, which is used to adapt to the vibration characteristics of broadband noise and improve the sound insulation effect in the mid and low frequencies.

2. The variable stiffness metastructure sound insulation board according to claim 1, characterized in that, The outer panel (1) has a thickness of 1~10mm, the damping layer (2) has a thickness of 1~20mm, the middle partition (4) has a thickness of 1~50mm, the porous sound-absorbing layer (5) has a thickness of 20~200mm, the inner panel (6) has a thickness of 1~10mm, and the overall thickness of the variable stiffness superstructure sound insulation board is 20~300mm.

3. The variable stiffness metastructure sound insulation panel according to claim 1, characterized in that, The outer panel (1), the middle partition (4) and the inner panel (6) are made of an alloy, which is selected from aluminum alloy, stainless steel, magnesium alloy, titanium alloy or copper alloy.

4. The variable stiffness metastructure sound insulation panel according to claim 3, characterized in that, The aluminum alloy is 6061 aluminum alloy or 5052 aluminum alloy; the stainless steel is 304 stainless steel or 201 stainless steel; the copper alloy is H62 brass.

5. The variable stiffness metastructure sound insulation panel according to claim 1, characterized in that, The damping layer (2) is made of a polymer damping material, selected from one of the following: butyl rubber damping material, asphalt-based damping material, water-based acrylic damping coating, polyurethane damping material, or nitrile rubber damping composite material.

6. The variable stiffness metastructure sound insulation panel according to claim 1, characterized in that, The porous sound-absorbing layer (5) is made of porous sound-absorbing material, selected from one of glass wool, rock wool, polyester fiber cotton, melamine cotton or polyimide foam.

7. A variable stiffness metastructure sound insulation panel according to claim 1, characterized in that, The outer panel (1) is fixedly connected to the damping layer (2) by an adhesive; the middle partition (4) is fixedly connected to the porous sound-absorbing layer (5), and the porous sound-absorbing layer (5) is fixedly connected to the inner panel (6) by damping glue.

8. A variable stiffness metastructure sound insulation panel according to claim 1, characterized in that, When the porous sound-absorbing layer (5) is made of glass wool or rock wool, an auxiliary fixing component is also provided. The auxiliary fixing component cooperates with the second rib assembly (8) and / or the third rib assembly (9) to limit the position of the porous sound-absorbing layer (5).

9. A variable stiffness metastructure sound insulation panel according to claim 1, characterized in that, The first rib assembly (7) is welded or integrally formed with the outer panel (1) and / or the middle partition (4); the second rib assembly (8) and the third rib assembly (9) are welded or integrally formed with the middle partition (4) and / or the inner panel (6); the small ribs in each assembly are fixed perpendicularly to the main ribs.

10. A variable stiffness metastructure sound insulation panel according to claim 1, characterized in that, The first rib assembly (7) includes at least two rows of small ribs, with each row of small ribs evenly distributed along the height direction of the air layer (3).

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