Acoustic metamaterial sound insulation barrier capable of being used for reducing low-frequency noise in transformer

Abstract

The invention designs an acoustic metamaterial sound insulation barrier capable of being used for reducing low-frequency noise in a transformer. The acoustic metamaterial sound insulation barrier comprises a supporting plate, a honeycomb-shaped frame, a distributed film acoustic metamaterial structure, a porous sound absorption material and a micro-perforated plate. Wherein the supporting plate is arranged at the bottom of the structure and supports the whole structure; the honeycomb-shaped frame is installed on the supporting plate and is perpendicular to the supporting plate. The micro-perforated plate is mounted at the topmost end of the honeycomb-shaped frame; the distributed film acoustic metamaterial structure is mounted below the micro-perforated plate; and the porous sound absorption material is arranged below the distributed film acoustic metamaterial structure. A traditional film acoustic metamaterial structure is optimized, the distribution mode of the elastic layers is improved on the basis that the elastic layers are added, the distributed film acoustic metamaterial structure is designed, the low-frequency sound insulation performance of the whole structure is optimized, and the sound insulation performance of the whole structure is improved. And a film acoustic metamaterial sound insulation barrier for reducing low-frequency noise in the transformer is designed by combining a traditional sound insulation material, so that the sound insulation performance of the barrier is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer noise reduction, and in particular to a thin-film acoustic metamaterial composite sound insulation barrier for reducing medium and low-frequency noise in transformers. Background Art

[0002] With the advancement of urbanization, substations originally located in suburban areas are increasingly surrounded by residential areas. To meet residential electricity demand, some substations are even located directly within residential areas. However, the audible noise generated during substation operation, particularly the mid- and low-frequency noise emitted by the main transformer, has become a significant environmental concern. This noise is not only highly penetrating but also slow to decay, posing a threat to human health and affecting equipment operational stability. While conventional materials can effectively control mid- and high-frequency noise in engineering, the unique properties of low-frequency noise make traditional sound insulation materials ineffective in achieving optimal noise reduction. Therefore, addressing substation noise pollution, particularly low-frequency noise, has become a pressing technical challenge for environmental protection agencies and research institutions. Thin-film acoustic metamaterials, thanks to their superior physical properties such as negative refraction, negative equivalent mass density, and negative equivalent bulk modulus, demonstrate significant advantages in blocking low-frequency noise. These material properties offer broad potential for transformer noise reduction. Summary of the Invention

[0003] The present invention proposes a distributed thin film acoustic metamaterial composite sound insulation barrier for effectively reducing low-frequency noise in transformers.

[0004] In order to achieve the purpose of transformer low-frequency noise reduction, the technical solution of the present invention is:

[0005] An acoustic metamaterial sound barrier that can be used to reduce low-frequency noise in a transformer, comprising: a support plate, a honeycomb frame, a distributed thin-film acoustic metamaterial structure, a porous sound-absorbing material, and a micro-perforated plate;

[0006] The support plate is installed at the bottom of the entire structure; the honeycomb frame is installed above the support plate and can enclose several isolated areas; the micro-perforated plate is placed on the top of the honeycomb frame; the distributed thin film acoustic metamaterial structure is installed under the micro-perforated plate; and the porous sound absorbing material is installed under the distributed thin film acoustic metamaterial structure.

[0007] The support plate can be made of steel or other materials that can play a supporting role, and the geometric dimensions can be changed according to actual conditions;

[0008] The honeycomb frame can be made of metal materials such as aluminum alloy or polymer materials such as polyimide, and the geometric dimensions are modified according to actual conditions;

[0009] The honeycomb frame is a regular hexagonal structure, and can also be a triangle, quadrilateral, pentagon or other structure, and the geometric dimensions are changed according to actual conditions;

[0010] The porous sound-absorbing material can be made of polycarbonate, glass fiber reinforced plastic, bamboo fiberboard, etc., and its geometric dimensions are modified according to actual conditions;

[0011] The micro-perforated plate can be made of epoxy resin or other metal materials, and its geometric dimensions can be modified according to actual conditions;

[0012] The distributed thin film acoustic metamaterial structure is the core of the present invention, comprising a distributed elastic layer, a thin film, a mass block, and a frame;

[0013] The distributed elastic layer of the distributed thin film acoustic metamaterial structure is made of rubber material, including natural rubber, silicone rubber, butyl rubber, etc., and the geometric dimensions are modified according to actual conditions;

[0014] The film of the distributed thin film acoustic metamaterial structure is made of polyimide material, and may also be made of other materials such as polyurethane and epoxy resin, and the geometric dimensions are modified according to actual conditions;

[0015] The mass block of the distributed thin film acoustic metamaterial structure is made of metal materials, including iron, aluminum, steel, etc., and its geometric dimensions are modified according to actual conditions;

[0016] The frame of the distributed thin film acoustic metamaterial structure can be made of EVA material, epoxy resin, etc., and the geometric dimensions are modified according to actual conditions; BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a distributed thin film acoustic metamaterial composite sound insulation barrier provided by the present invention for effectively reducing low-frequency noise in transformers.

[0018] Figure 2 yes Figure 1 A schematic diagram of a unit cell structure.

[0019] Figure 3 yes Figure 2 Schematic diagram of a distributed thin film acoustic metamaterial unit cell structure.

[0020] Figure 4 It is a schematic diagram of sound wave incident.

[0021] Figure 5 It is a sound transmission loss curve diagram of the present invention.

[0022] Figure: 1. Support plate; 2. Porous sound-absorbing material; 3. Distributed thin-film acoustic metamaterial structure; 4. Microperforated plate; 5. Mass block; 6. Elastic layer; 7. Distributed thin-film acoustic metamaterial structure frame; 8. Thin film; 9. Honeycomb frame. Specific implementation plan

[0023] In order to more clearly and completely explain the purpose of the present invention and the characteristics of the technical solution, a more detailed description is given in conjunction with the relevant drawings of the present invention. It should be noted that the embodiment described below is only one of the many embodiments of the present invention and serves only to explain the present invention and does not limit the present invention in any way.

[0024] The present invention provides a thin-film acoustic metamaterial composite sound insulation barrier for suppressing low-frequency noise in transformers. The barrier utilizes plate-film coupling technology and combines it with traditional sound insulation materials to maximize the low-frequency sound insulation performance without affecting its high-frequency sound insulation performance, thereby optimizing the overall sound insulation performance of the material.

[0025] The thin film acoustic metamaterial sound insulation barrier is as follows Figure 1 As shown, it includes: a support plate (1), a porous sound-absorbing material (2), a distributed thin-film acoustic metamaterial structure (3), a micro-perforated plate (4), and a honeycomb frame (9).

[0026] The support plate is the bottom plate of the entire sound insulation barrier; the honeycomb frame (9) is vertically mounted on the support plate (1), and other accessories are fixed on the side walls formed by the honeycomb frame; the micro-perforated plate (4) is mounted on the top of the honeycomb frame (9) as a top plate; the porous sound absorbing material (2) is mounted on the support plate (1) and embedded in the interior of the honeycomb frame (9); the distributed thin film acoustic metamaterial structure (3) is mounted on the porous sound absorbing material (2);

[0027] The distributed thin film acoustic metamaterial structure (3) comprises a mass block (5), an elastic layer (6), a distributed thin film acoustic metamaterial structure frame (7), and a thin film (8).

[0028] The present invention provides a method for manufacturing the above-mentioned acoustic metamaterial sound insulation barrier.

[0029] The specific steps are as follows:

[0030] S1, the support plate (1) serves as the bottom plate to support the entire structure. The honeycomb frame (9) is vertically mounted on the support plate (1) to form a plurality of small units isolated from each other.

[0031] S2. The porous sound-absorbing material (2) is installed on the support plate (1) and is tightly fitted to the honeycomb frame (9).

[0032] S3. Install the distributed thin film acoustic metamaterial structure (3) on the honeycomb frame (9), 3-4 mm away from the porous sound absorbing material.

[0033] S4. The micro-perforated plate (4) serves as the top plate of the sound barrier, and is 3-4 mm above the distributed thin film acoustic metamaterial structure (3), capping the honeycomb frame (9).

[0034] The support plate in S1 can be made of steel or other materials that can play a supporting role, with a thickness of 3-4 mm, and the geometric dimensions are changed according to actual conditions. The connection method of the support plate (1) and the honeycomb frame (9) is ultrasonic bonding, glue bonding, etc.

[0035] The honeycomb frame (9) in S1 is a hexagonal structure, and can be made of metal materials such as aluminum alloy or polymer materials such as polyimide, with a height of 20-25 mm, a length of 55 mm, and a width of 5 mm.

[0036] The porous sound absorbing material (3) in S2 can be made of polycarbonate, glass fiber reinforced plastic, bamboo fiberboard, etc. The thickness is 10-15 mm.

[0037] The distributed thin film acoustic metamaterial structure (3) described in S3 is the core of the present invention, and specifically includes a mass block (5), an elastic layer (6), a distributed thin film acoustic metamaterial structure frame (7), and a thin film (8); it is installed inside a honeycomb frame (9), and the connection method is ultrasonic adhesion, glue adhesion, etc.

[0038] The film (8) of the distributed thin film acoustic metamaterial structure (3) is made of polyimide material, and may also be made of other materials such as polyurethane and epoxy resin; the thickness is 0.2 mm.

[0039] The mass blocks (5) of the distributed thin film acoustic metamaterial structure (3) are made of metal materials, including iron, aluminum, steel, etc.; the radius is 5 mm and the thickness is 2 mm; the distance between the mass blocks (5) and the center of the thin film (8) is 20 mm, the number of the mass blocks (5) is 8, and they are evenly distributed on the thin film (8).

[0040] The elastic layer (6) of the distributed thin film acoustic metamaterial structure (3) can be made of rubber material, including natural rubber, silicone rubber, butyl rubber, etc.; the radius is 2 mm and the thickness is 2 mm; it is evenly distributed on the bottom of the mass block (5) and closely fits the mass block (5), and the number is 4; the connection method between the elastic layer (6) and the mass block (5) and the thin film (8) is ultrasonic adhesion, glue adhesion, etc.

[0041] The micro-perforated plate (4) described in S4 can be made of epoxy resin or other metal materials; the thickness is 1-3 mm, the perforation radius is 1 mm, and the perforation rate is 2%; the micro-perforated plate (4) and the honeycomb frame (9) are bonded by ultrasonic bonding, glue bonding, etc.

[0042] Laying the above-mentioned thin film acoustic metamaterial sound insulation barrier used for low-frequency noise reduction in transformers on walls or around equipment can play a role in isolating noise.

[0043] Example 1

[0044] like Figure 4 As shown, a thin film acoustic metamaterial sound insulation barrier for reducing low-frequency noise in a transformer comprises: a support plate (1), a porous sound absorbing material (2), a distributed thin film acoustic metamaterial structure (3), a micro-perforated plate (4), and a honeycomb frame (9);

[0045] The simulation was carried out in the simulation software with the incident wave frequency of 50-1200Hz. The simulation results are as follows Figure 5 shown.

[0046] Figure 5 The horizontal axis is frequency (Hz) and the vertical axis is sound transmission loss (dB).

[0047] From the simulation results, it can be seen that the average sound insulation of the structure within 1200Hz is 51.23dB, the sound insulation at 100Hz is 25dB, the sound insulation at 200Hz is 75dB, and within 300-700Hz, the sound insulation is stable at more than 50dB. This shows that the structure has a good effect on transformer noise reduction.

[0048] The above description is only a preferred example of the present invention, which is only used to illustrate the effects and purposes of the present invention and does not limit the present invention in any way. Any modification or substitution made on the basis of the concept of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A thin film acoustic metamaterial sound barrier for reducing low-frequency noise in transformers, characterized in that: include: Support plate, honeycomb frame, distributed thin film acoustic metamaterial structure, porous sound absorbing material, micro-perforated plate; The support plate is installed at the bottom of the entire structure; the honeycomb frame is installed above the support plate and can enclose several isolated areas. The micro-perforated plate is placed on the top of the honeycomb frame; the distributed thin-film acoustic metamaterial structure is installed under the micro-perforated plate; and the porous sound-absorbing material is installed under the distributed thin-film acoustic metamaterial structure.

2. The thin film acoustic metamaterial sound barrier for reducing low-frequency noise in transformers according to claim 1, characterized in that: Optionally, the support plate can be made of steel or other materials that can play a supporting role; the thickness is 2-5 mm.

3. The thin film acoustic metamaterial sound barrier for reducing low-frequency noise in transformers according to claim 1, characterized in that: Optionally, the honeycomb frame can be made of metal materials such as aluminum alloy or polymer materials such as polyimide; the shape is a regular hexagonal structure, or other structures such as a triangle, a quadrilateral, a pentagon, etc.; the length is 55mm, the width is 5mm, and the height is 20-25mm.

4. The thin film acoustic metamaterial sound barrier for reducing low-frequency noise in transformers according to claim 1, characterized in that: Optionally, the porous sound-absorbing material may be made of polycarbonate, glass fiber reinforced plastic, bamboo fiberboard, etc., and has a thickness of 10-15 mm.

5. The thin film acoustic metamaterial sound barrier for reducing low-frequency noise in transformers according to claim 1, characterized in that: Optionally, the micro-perforated plate may be made of epoxy resin or other metal materials; the thickness may be 1-3 mm, the perforation radius may be 1 mm, and the perforation rate may be 2%.

6. The thin film acoustic metamaterial sound barrier for reducing low-frequency noise in transformers according to claim 1, characterized in that: Optionally, the distributed thin film acoustic metamaterial structure specifically includes: a distributed elastic layer, a thin film, a mass block, and a frame; The distributed elastic layer of the distributed thin film acoustic metamaterial structure is made of rubber material, including natural rubber, silicone rubber, butyl rubber, etc.; the radius is 2 mm and the thickness is 2 mm; The film of the distributed thin film acoustic metamaterial structure is made of polyimide material, and may also be made of other materials such as polyurethane and epoxy resin; the thickness is 2mm; The mass block of the distributed thin film acoustic metamaterial structure is made of metal material, including iron, aluminum, steel, etc.; the radius is 5 mm and the thickness is 2 mm; The frame of the distributed thin film acoustic metamaterial structure can be made of EVA material, epoxy resin, etc.; the frame has a side length of 50 mm, a width of 2 mm, and a thickness of 5 mm.

7. The distributed elastic layer of a thin film acoustic metamaterial sound barrier for reducing low-frequency noise in a transformer according to claim 6, characterized in that: The distributed elastic layer is located between the film and the mass block, and serves to connect the two.

8. The method for manufacturing a thin film acoustic metamaterial sound barrier for reducing low-frequency noise in a transformer according to claim 1, characterized in that: The connection between the support plate and the honeycomb frame is by ultrasonic bonding, glue bonding, etc. The connection between the distributed thin film acoustic metamaterial structure and the honeycomb frame is by ultrasonic bonding, glue bonding, etc. The connection between the micro-perforated plate and the honeycomb frame is carried out by ultrasonic bonding, glue bonding, etc. The distributed elastic layer is connected to the film and the mass block by ultrasonic adhesion, glue adhesion, etc.

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