Noise reduction composite material and noise reduction hood

Abstract

The invention relates to a noise reduction composite material and a noise reduction hood, in particular to the technical field of noise reduction, and the noise reduction composite material comprises a surface layer, a middle layer and a bottom surface dynamic vibration balance layer which are connected in sequence; the bottom surface dynamic vibration balance layer comprises a film layer and vibrator regions which are arranged on the surface of the film layer and are distributed in an array manner; the oscillator area comprises a frame, and at least two middle blocks are arranged in the frame; and the oscillator region is adjacent to the middle layer. According to the noise reduction composite material provided by the invention, the specific bottom surface dynamic vibration balance layer is introduced to be matched with the middle layer and the surface layer, so that attenuation of 100-800Hz low and medium frequency noise is effectively realized, and a good noise reduction effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of noise reduction technology, and particularly relates to a noise reduction composite material and a noise reduction engine hood. Background Art

[0002] At present, the engine hoods of mass-produced vehicles generally adopt single-layer plastics (such as PP, ABS) or polyurethane PU materials, and only achieve basic sound insulation through the material thickness, which has significant defects:

[0003] 1. Low-frequency noise out of control: The single-layer structure follows the mass law, and the sound insulation effect on low-frequency noise decreases exponentially with the decrease of frequency. Moreover, thickening leads to an increase in weight, and it is impossible to meet the dual requirements of lightweight and noise reduction.

[0004] 2. Lack of frequency adaptability: The existing single-layer engine cover has no optimized structure for specific noise frequencies. In the simple superposition scheme of the traditional "plastic layer + sound-absorbing cotton", the sound-absorbing cotton can only absorb medium-frequency noise, and there is no effective control over the transmission of low-frequency vibration.

[0005] 3. Insufficient coordination of functional layers: The multi-layer structures tried by a few models are mostly "plastic layer + fixed sound-absorbing cotton", and no dynamic vibration balance mechanism is formed, and it is impossible to adapt to the noise characteristics of different models through parameter adjustment.

[0006] Based on this, the prior art improves the noise reduction effect of the engine hood by designing a multi-layer noise reduction material. For example, CN114532048A discloses a sound-absorbing and noise-reducing cover shell. A sealing strip is provided at the connection between the shell and the lawn mower. A foam aluminum sound-absorbing layer and a fiber sound-absorbing layer are sequentially arranged inside the shell. Spring buckles are provided on the outer side surfaces of the four sides of the shell. An air inlet pipe of the cover shell and an engine exhaust pipe are provided on one side surface of the shell, and an exhaust pipe of the cover shell is provided on the other side surface. Turbines are provided on the air inlet pipe of the cover shell and the engine exhaust pipe, and the exhaust pipe of the cover shell and the engine exhaust pipe are respectively connected to a muffler.

[0007] CN205292811U discloses an engine noise reduction and heat insulation cover, including a groove-shaped body, which is a sandwich structure and consists of an inner layer aluminized steel plate, at least one layer of heat-resistant fiber layer and an outer layer aluminized steel plate from inside to outside. At least two vertical side strengthening ribs are provided on the outer shell of the groove-shaped body. The engine noise reduction and heat insulation cover of this solution adopts the design of a sandwich structure, and a layer of heat-resistant fiber is designed between the two aluminized steel plates.

[0008] However, the existing engine hood has the defect that the noise reduction effect for sounds with a frequency of 200 - 350 Hz is poor, resulting in a significant reduction in comfort. Summary of the Invention

[0009] In view of the problems existing in the prior art, the purpose of the present invention is to provide a noise reduction composite material and a noise reduction hood, so as to solve the defect that the noise reduction effect for sounds with a frequency of 200 - 350 Hz is poor, resulting in a significant reduction in comfort.

[0010] To achieve this purpose, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides a noise reduction composite material, which includes: a surface layer, an intermediate layer, and a bottom dynamic vibration balance layer connected in sequence;

[0012] The bottom dynamic vibration balance layer includes: a film layer and an array of vibrator regions arranged on the surface of the film layer;

[0013] The vibrator region includes: a frame, and at least two intermediate blocks are arranged inside the frame;

[0014] The vibrator region is adjacent to the intermediate layer.

[0015] The noise reduction composite material provided by the present invention effectively realizes the attenuation of medium and low frequency noise in the range of 100 - 800 Hz by introducing a specific bottom dynamic vibration balance layer in cooperation with the intermediate layer and the surface layer, and has a good noise reduction effect.

[0016] As a preferred technical solution of the present invention, the area of the intermediate block is 1.6 - 25% of the area of the hollow region formed by the frame.

[0017] Preferably, the intermediate blocks are evenly spaced.

[0018] As a preferred technical solution of the present invention, a central block is arranged inside the frame.

[0019] Preferably, the intermediate blocks are arranged around the central block.

[0020] Preferably, the area of the central block is 2 - 25% of the area of the hollow region formed by the frame.

[0021] As a preferred technical solution of the present invention, the shape of the central block includes a circle and / or a polygon.

[0022] Preferably, the thickness of the central block is 0.5 - 5 mm.

[0023] As a preferred technical solution of the present invention, the shape of the intermediate block includes a circle and / or a polygon.

[0024] Preferably, the thickness of the intermediate block is 0.5 - 5 mm.

[0025] As a preferred technical solution of the present invention, the equivalent circular diameter of the frame is 50 - 200 mm.

[0026] Preferably, the thickness of the frame is 0.5-5 mm.

[0027] As a preferred technical solution of the present invention, the surface layer includes: one or a combination of at least two of a polypropylene layer, an acrylonitrile-butadiene-styrene copolymer layer, a polycarbonate layer, a long fiber reinforced thermoplastic layer, or a thermoplastic polyurethane elastomer layer.

[0028] Preferably, the thickness of the surface layer is 1-6 mm.

[0029] As a preferred technical solution of the present invention, the intermediate layer includes: a polyethylene terephthalate layer and / or a polyurethane layer.

[0030] Preferably, the areal density of the intermediate layer is 200-2000 g / m 3 .

[0031] Preferably, the thickness of the intermediate layer is 10-30 mm.

[0032] As a preferred technical solution of the present invention, the film layer includes: one or a combination of at least two of a polyimide layer, a polyether ether ketone layer, a polyphenylene sulfide layer, or a polytetrafluoroethylene layer.

[0033] Preferably, the thickness of the film layer is 0.005-0.5 mm.

[0034] Preferably, the material of the inner frame in the oscillator area includes a metal material and / or a heavy layer material.

[0035] Preferably, the material of the middle block in the oscillator area includes a metal material and / or a heavy layer material.

[0036] Preferably, the material of the central block in the oscillator area includes a metal material and / or a heavy layer material.

[0037] In a second aspect, the present invention provides a noise reduction engine cover, and the noise reduction engine cover includes: the noise reduction composite material as described in the first aspect.

[0038] Compared with the prior art solutions, the present invention has the following beneficial effects:

[0039] The noise reduction composite material provided by the present invention realizes targeted control of low-frequency noise and full-condition adaptation through a composite structure design with three-layer functional differentiation. Specifically, it excites reverse cooperative vibration through an oscillator array to attenuate the medium and low-frequency noise of 100-800 Hz. Further, through the design of the three-layer functional composite structure, the sound insulation performance of the frequency-modulated noise reduction engine cover provided by the present invention in the noise range of 200-350 Hz is significantly better than that of a common engine cover, meeting the frequency design target. Description of the Drawings

[0040] Figure 1 It is a schematic structural diagram of the noise reduction composite material provided by the embodiments of the present invention;

[0041] Figure 2 It is a schematic structural diagram of the bottom dynamic vibration balance layer in the noise reduction composite material provided by the embodiments of the present invention;

[0042] Figure 3 It is a graph of the sound transmission loss results of Embodiments 1-4 of the present invention;

[0043] Figure 4 It is a comparison graph of the sound transmission loss of Embodiment 1 of the present invention and Comparative Examples 1-4.

[0044] In the figure: 100 - surface layer, 200 - intermediate layer, 300 - bottom dynamic vibration balance layer, 310 - frame, 320 - intermediate block, 330 - central block.

[0045] The present invention will be further described in detail below. However, the following examples are merely simple examples of the present invention and do not represent or limit the scope of the protection of the present invention. The scope of protection of the present invention shall be subject to the claims. Specific Embodiments

[0046] To better illustrate the present invention and facilitate understanding of the technical solution of the present invention, the typical but non-limiting embodiments of the present invention are as follows:

[0047] Currently, although the noise reduction materials for engines adopt a multi-layer composite method, there are still certain defects in the noise reduction effect, and the noise reduction effect for medium and low frequency noises in the range of 100 - 800 Hz is still poor. Therefore, the present invention designs the composite material to improve the noise reduction effect of the composite material, as follows:

[0048] This embodiment provides a noise reduction composite material, as Figure 1 shown, the noise reduction composite material includes: a surface layer 100, an intermediate layer 200, and a bottom dynamic vibration balance layer 300 that are connected in sequence;

[0049] The bottom dynamic vibration balance layer 300 includes: a film layer and an oscillator region arranged in an array on the surface of the film layer, as Figure 2 shown;

[0050] The oscillator region includes: a frame 310, and at least two intermediate blocks 320 are arranged inside the frame 310;

[0051] The oscillator region is adjacent to the intermediate layer 200.

[0052] In the present invention, the oscillator regions with array distribution can be selectively spaced apart or adjacent to each other. The spacing of the spaced-apart distribution can be selected as 15% - 85% of the shortest side length. For example, it can be 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80% or 85%, etc., but is not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0053] In the present invention, the connection manner of the surface layer 100, the intermediate layer 200 and the bottom dynamic vibration balance layer 300 can be selectively glue bonding, or preformed with corresponding materials and then cured to achieve connection.

[0054] In the present invention, the noise reduction composite material can also be provided with temperature-resistant materials, corrosion-resistant materials, etc. on the surface according to the usage process to further improve the final usage performance.

[0055] In the present invention, the number of at least two intermediate blocks 320 provided, for example, can be 2, 3, 4, 5, 6, 7 or 8, etc., but is not limited to the listed values. Other unlisted values within this range also meet the requirements, but the subsequent area limitation requirements need to be ensured.

[0056] Among them, the area of the intermediate block 320 is 1.6 - 25% of the area of the hollow region formed by the frame 310. For example, it can be 1.6%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24% or 25%, etc., but is not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0057] In the present invention, the center distance refers to the distance between the center of the center block 330 and the center of the intermediate block 320.

[0058] Among them, the intermediate blocks 320 are equally spaced.

[0059] Among them, a center block 330 is provided inside the frame 310.

[0060] Among them, the intermediate blocks 320 are arranged around the center block 330.

[0061] Among them, the area of the central block 330 is 2%-25% of the area of the hollow region formed by the frame 310. For example, it can be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24% or 25%, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0062] In the present invention, the central block 330 can be optionally arranged at the center of the frame 310, or can be offset from the center of the frame 310. The central distance between the central block 330 and the intermediate block 320 can be optionally 7.5%-42.5% of the shortest side length of the frame. For example, it can be 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42% or 42.5%, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0063] Among them, the shape of the central block 330 includes a circle and / or a polygon.

[0064] In the present invention, the polygon can be optionally selected as a triangle, a square, a rectangle, a pentagon, etc. In specific selection, a mixture of multiple polygons can be selected, or it can also be a single polygon.

[0065] In the present invention, when the central block 330 is a polygon, the size of the polygon can be determined according to the equivalent circle area or area to determine the specific graphic size.

[0066] Among them, the thickness of the central block 330 is 0.5-5 mm. For example, it can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0067] Among them, the shape of the intermediate block 320 includes a circle and / or a polygon.

[0068] In the present invention, when the intermediate block 320 is a polygon, the size of the polygon can be determined according to the equivalent circle area or area to determine the specific graphic size.

[0069] Among them, the thickness of the middle block 320 is 0.5 - 5 mm. For example, it can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0070] Among them, the equivalent circular diameter of the frame 310 is 50 - 200 mm. For example, it can be 50 mm, 60 mm, 80 mm, 100 mm, 120 mm, 140 mm, 160 mm, 180 mm or 200 mm, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0071] In the present invention, the shape of the frame 310 can be selected as a polygon, such as a square, a rectangle, a pentagon, a hexagon, etc.

[0072] Among them, the surface layer 100 includes: one or at least two combinations of a polypropylene layer, an acrylonitrile - butadiene - styrene copolymer layer, a polycarbonate layer, a long - fiber reinforced thermoplastic layer or a thermoplastic polyurethane elastomer layer.

[0073] Exemplarily, the combination of the surface layer 100 materials can be selected as: the combination of a polypropylene layer and an acrylonitrile - butadiene - styrene copolymer layer, the combination of a polycarbonate layer and a long - fiber reinforced thermoplastic layer, the combination of a polypropylene layer and a thermoplastic polyurethane elastomer layer, etc.

[0074] Among them, the thickness of the surface layer 100 is 1 - 6 mm. For example, it can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 6 mm, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0075] Among them, the intermediate layer 200 includes: a polyethylene terephthalate layer and / or a polyurethane layer.

[0076] Among them, the areal density of the intermediate layer 200 is 200 - 2000 g / m 3 , for example, it can be 200 g / m 3 , 400 g / m 3 , 600 g / m 3 , 800 g / m 3 , 1000 g / m 3 , 1200 g / m 3 , 1400 g / m 3 , 1600 g / m 3 , 1800 g / m 3 or 2000 g / m 3 etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0077] Among them, the thickness of the middle layer 200 is 10 - 30 mm. For example, it can be 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, or 30 mm, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0078] Among them, the film layer includes one or a combination of at least two of: a polyimide layer, a polyether ether ketone layer, a polyphenylene sulfide layer, or a polytetrafluoroethylene layer.

[0079] Exemplarily, the combination of the film layers can be selected as: the combination of a polyimide layer and a polyether ether ketone layer, the combination of a polyether ether ketone layer and a polyphenylene sulfide layer, the combination of a polyphenylene sulfide layer and a polytetrafluoroethylene layer, etc.

[0080] Among them, the thickness of the film layer is 0.005 - 0.5 mm. For example, it can be 0.005 mm, 0.006 mm, 0.008 mm, 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.4 mm, or 0.5 mm, etc., but not limited to the listed values. Other unlisted values within this range also meet the requirements.

[0081] Among them, the material of the inner frame 310 in the oscillator area includes a metal material and / or a heavy layer material.

[0082] Among them, the material of the middle block 320 in the oscillator area includes a metal material and / or a heavy layer material.

[0083] Among them, the material of the central block 330 in the oscillator area includes a metal material and / or a heavy layer material.

[0084] In the present invention, the metal materials used include: iron, aluminum, copper, etc.

[0085] In the present invention, the heavy layer materials used include: ethylene propylene diene monomer rubber EPDM and / or ethylene - vinyl acetate copolymer EVA, etc.

[0086] Furthermore, this embodiment provides a noise reduction hood, and the noise reduction hood includes: the noise reduction composite material as described above.

[0087] Furthermore, in order to illustrate the noise reduction effect that the noise reduction composite material provided by the present invention can achieve, the following actual examples are used for exemplary description, specifically as follows:

[0088] Example 1

[0089] This embodiment provides a noise reduction composite material, which includes: a surface layer 100, an intermediate layer 200, and a bottom dynamic vibration balance layer 300 connected in sequence;

[0090] The surface layer 100 is a polypropylene layer with a thickness of 2 mm;

[0091] The intermediate layer 200 is a polyethylene terephthalate layer with a surface density of 600 g / m 3 , and a thickness of 20 mm;

[0092] The bottom dynamic vibration balance layer 300 includes: a film layer and an adjacent array of oscillator regions arranged on the surface of the film layer; the oscillator region includes: a frame 310, a central block 330 arranged within the frame 310, and 4 intermediate blocks 320 arranged equidistantly around the central block 330, and the central distance between the central block 330 and the intermediate blocks 320 is 10% of the length of the frame; the oscillator region is adjacent to the intermediate layer 200;

[0093] The area of the central block 330 is 3% of the area of the hollow region formed by the frame 310, and the thickness is 3 mm; the area of the intermediate block 320 is 7% of the area of the hollow region formed by the frame 310, the intermediate blocks 320 are equidistantly distributed, and the thickness is 2 mm; the shape of the central block 330 is square; the shape of the intermediate block 320 is circular; the frame 310 is a square frame with a side length of 120 mm and a thickness of 3 mm;

[0094] The film layer of the bottom dynamic vibration balance layer 300 is a polyimide layer with a thickness of 0.2 mm; the material of the inner frame 310 in the oscillator region is ethylene propylene diene monomer (EPDM); the material of the intermediate blocks 320 in the oscillator region is iron; the material of the central block 330 in the oscillator region is ethylene propylene diene monomer (EPDM).

[0095] Embodiment 2

[0096] This embodiment provides a noise reduction composite material, which includes: a surface layer 100, an intermediate layer 200, and a bottom dynamic vibration balance layer 300 connected in sequence;

[0097] The surface layer 100 is an acrylonitrile - butadiene - styrene copolymer layer with a thickness of 4 mm;

[0098] The intermediate layer 200 is a polyurethane layer with a surface density of 1500 g / m 3 , and a thickness of 25 mm;

[0099] The bottom dynamic vibration balance layer 300 includes: a film layer and oscillator regions arranged in an adjacent array on the surface of the film layer; the oscillator regions include: a frame 310, a central block 330 arranged within the frame 310, and 4 intermediate blocks 320 arranged at equal intervals around the central block 330, the central distance between the central block 330 and the intermediate blocks 320 being 20% of the length of the frame; the oscillator regions are adjacent to the intermediate layer 200;

[0100] The area of the central block 330 is 4.5% of the area of the hollow region formed by the frame 310, and the thickness is 4 mm; the area of the intermediate blocks 320 is 10.5% of the area of the hollow region formed by the frame 310, the intermediate blocks 320 are equally spaced, and the thickness is 3.5 mm; the shape of the central block 330 is a regular pentagon; the shape of the intermediate blocks 320 is a square; the frame 310 is a rectangular frame with a length of 100 mm, a width of 72 mm, and a thickness of 4 mm;

[0101] The film layer of the bottom dynamic vibration balance layer 300 is a polyether ether ketone layer with a thickness of 0.2 mm; the material of the inner frame 310 in the oscillator region is ethylene-vinyl acetate copolymer EVA; the material of the intermediate blocks 320 in the oscillator region is aluminum; the material of the central block 330 in the oscillator region is aluminum.

[0102] Example 3

[0103] This example provides a noise reduction composite material, which includes: a surface layer 100, an intermediate layer 200, and a bottom dynamic vibration balance layer 300 connected in sequence;

[0104] The surface layer 100 is a thermoplastic polyurethane elastomer layer with a thickness of 6 mm;

[0105] The intermediate layer 200 is a polyethylene terephthalate layer with a surface density of 200 g / m 3 , and a thickness of 30 mm;

[0106] The bottom dynamic vibration balance layer 300 includes: a film layer and oscillator regions arranged in an adjacent array on the surface of the film layer; the oscillator regions include: a frame 310, 6 intermediate blocks 320 arranged at equal intervals around the center of the frame 310, and the oscillator regions are adjacent to the intermediate layer 200;

[0107] The area of the intermediate blocks 320 is 12% of the area of the hollow region formed by the frame 310, the intermediate blocks 320 are equally spaced, and the thickness is 3 mm; the shape of the intermediate blocks 320 is circular; the frame 310 is a square frame with a side length of 90 mm;

[0108] The film layer of the bottom dynamic vibration balance layer 300 is a polytetrafluoroethylene layer with a thickness of 0.5 mm; the material of the inner frame 310 in the oscillator area is ethylene propylene diene monomer (EPDM); the material of the middle block 320 in the oscillator area is ethylene-vinyl acetate copolymer (EVA).

[0109] Example 4

[0110] This example provides a noise reduction composite material, which includes: a surface layer 100, an intermediate layer 200, and a bottom dynamic vibration balance layer 300 connected in sequence;

[0111] The surface layer 100 is a polycarbonate layer with a thickness of 1 mm;

[0112] The intermediate layer 200 is a polyurethane layer with a surface density of 2000 g / m 3 and a thickness of 10 mm;

[0113] The bottom dynamic vibration balance layer 300 includes: a film layer and oscillator areas arranged adjacent to each other and distributed in an array on the surface of the film layer; the oscillator area includes: a frame 310, a central block 330 arranged inside the frame 310, two intermediate blocks 320 arranged equidistantly around the central block 330, and the central distance between the central block 330 and the intermediate blocks 320 is 42.5% of the length of the frame; the oscillator area is adjacent to the intermediate layer 200;

[0114] The area of the central block 330 is 7% of the area of the hollow region formed by the frame 310, with a thickness of 0.5 mm; the area of the intermediate block 320 is 16% of the area of the hollow region formed by the frame 310, the intermediate blocks 320 are distributed equidistantly, with a thickness of 0.5 mm; the shape of the central block 330 is square; the shape of the intermediate block 320 is circular; the frame 310 is a square frame with a side length of 60 mm;

[0115] The film layer of the bottom dynamic vibration balance layer 300 is a polyphenylene sulfide layer with a thickness of 0.005 mm; the material of the inner frame 310 in the oscillator area is iron; the material of the intermediate blocks 320 in the oscillator area is iron; the material of the central block 330 in the oscillator area is iron.

[0116] Comparative Example 1

[0117] The difference from Example 1 is only that the bottom dynamic vibration balance layer is not provided in the noise reduction composite material.

[0118] Comparative Example 2

[0119] The difference from Example 1 is only that the intermediate blocks are not provided in the oscillator area.

[0120] Comparative Example 3

[0121] The difference from Example 1 is only that the area of the central block in the oscillator region is 1.5% of the area of the hollow region formed by the frame.

[0122] Comparative Example 4

[0123] The difference from Example 1 is only that no frame is provided in the oscillator region.

[0124] The noise reduction composites obtained from the above examples and comparative examples were analyzed for their noise reduction performance. Sound transmission loss is an important indicator to measure noise reduction performance. The structural sound transmission loss test was carried out according to the international standard ISO 15186-1. The obtained results are as Figure 3 and Figure 4 shown. Figure 3 is the sound transmission loss of Examples 1-4, Figure 4 is the sound transmission loss of Example 1 and Comparative Examples 1-4. It can be seen from Figure 3 that by adjusting the materials and structures of each layer, the present invention can cover the high-performance frequency band up to 100-800 Hz, and can be designed and selected according to different powertrain performances. It can be seen from Figure 4 that in the frequency range of 200-350 Hz, the sound insulation performance of the frequency-modulated noise reduction composite material of the present invention is significantly better than that of the other comparative examples.

[0125] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0126] In addition, it should be noted that, in the case of no contradiction, the various specific technical features described in the above specific embodiments can be combined in any suitable way. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0127] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A noise reduction composite material, characterized in that, The noise reduction composite material includes: a surface layer, an intermediate layer, and a bottom dynamic vibration balance layer connected in sequence; The bottom dynamic vibration balance layer includes: a film layer and an oscillator area arranged in an array on the surface of the film layer; The oscillator area includes: a frame, and at least two intermediate blocks are arranged inside the frame; The oscillator area is adjacent to the intermediate layer.

2. The noise reduction composite material according to claim 1, characterized in that The area of the intermediate block is 1.6-25% of the area of the hollow region formed by the frame; Preferably, the intermediate blocks are equally spaced.

3. The noise reduction composite material according to claim 1 or 2, characterized in that A central block is arranged inside the frame; Preferably, the intermediate blocks are arranged around the central block; Preferably, the area of the central block is 2-25% of the area of the hollow region formed by the frame.

4. The noise reduction composite material according to claim 3, wherein The shape of the central block includes a circle and / or a polygon; Preferably, the thickness of the central block is 0.5-5 mm.

5. The noise reduction composite material according to any one of claims 1-4, characterized in that The shape of the intermediate block includes a circle and / or a polygon; Preferably, the thickness of the intermediate block is 0.5-5 mm.

6. The noise reduction composite material according to any one of claims 1-5, characterized in that, The equivalent circular diameter of the frame is 50-200 mm; Preferably, the thickness of the frame is 0.5-5 mm.

7. The noise reduction composite material according to any one of claims 1-6, characterized in that, The surface layer includes: one or at least two combinations of a polypropylene layer, an acrylonitrile-butadiene-styrene copolymer layer, a polycarbonate layer, a long fiber reinforced thermoplastic layer, or a thermoplastic polyurethane elastomer layer; Preferably, the thickness of the surface layer is 1-6 mm.

8. The noise reduction composite material according to any one of claims 1 to 7, characterized in that, The intermediate layer includes: a polyethylene terephthalate layer and / or a polyurethane layer; Preferably, the areal density of the intermediate layer is 200-2000 g / m 3 ; Preferably, the thickness of the intermediate layer is 10-30 mm.

9. The noise reduction composite material according to any one of claims 3-8, characterized in that, The film layer includes: one or at least two combinations of a polyimide layer, a polyether ether ketone layer, a polyphenylene sulfide layer, or a polytetrafluoroethylene layer; Preferably, the thickness of the film layer is 0.005-0.5 mm; Preferably, the material of the inner frame of the oscillator area includes a metal material and / or a heavy layer material; Preferably, the material of the intermediate blocks in the oscillator area includes a metal material and / or a heavy layer material; Preferably, the material of the central block in the oscillator area includes a metal material and / or a heavy layer material.

10. A noise reduction hood, characterized in that, The noise reduction hood includes: the noise reduction composite material according to any one of claims 1-9.

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