Clamping plate double-disc type vibration reduction structure based on acoustic black hole effect and design method

Abstract

The invention discloses a clamping plate double-disc type vibration reduction structure based on the acoustic black hole effect and a design method, and relates to the technical field of structural vibration reduction, noise reduction and acoustic vibration, the clamping plate double-disc type vibration reduction structure comprises a clamping plate structure and a plurality of double-disc type acoustic black hole components connected to a clamping plate middle layer in an array mode, and the centers of the upper surface and the lower surface of each double-disc type acoustic black hole component are circular boss planes; the upper circular boss plane and the lower circular boss plane are flatly attached to the two faces of the middle of the clamping plate, and the upper damping circular ring piece and the lower damping circular ring piece are attached to the edges of the upper surface and the lower surface of the double-boss disc respectively. Bending waves on the clamping plates are concentrated to the edge of the double-disc type acoustic black hole component, and vibration energy is restrained and absorbed through the damping ring pieces adhered to the upper surface and the lower surface of the structure. According to the acoustic black hole component, the strength and rigidity of the clamping plate are not damaged while the clamping plate structure is supported, and the purpose of well reducing vibration and noise can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of structural vibration and noise reduction and acoustic vibration technology, and in particular to a splint double-disc vibration reduction structure based on acoustic black hole effect and a design method thereof. Background Art

[0002] In fields such as shipbuilding and navigation, sonar equipment is widely used on platforms such as underwater vehicles. Clamp structures are also commonly found on side-mounted sonar platforms. Sonar platform vibration noise is a significant factor affecting sonar detection performance. Vibrations generated by the vehicle's propellers and power source are transmitted along the hull to the sonar array platform, generating scattered noise. Excessive vibration noise can significantly interfere with sonar far-field signal reception. Reducing sonar platform vibration noise can improve the vehicle's stealth and enhance sonar detection performance.

[0003] Existing vibration control methods mainly include installing passive, adaptive passive, or active vibration isolation systems to consume or absorb vibration energy along the transmission path, thereby achieving a vibration reduction effect. However, most traditional active or passive control methods have disadvantages such as complex control systems, the need for external power supply, poor stability, and a narrow control frequency band and a small number of control frequency points. The acoustic black hole effect proposes a new approach. The thickness variation of the ideal acoustic black hole structure follows a power law distribution h(x) = εx m , under ideal conditions, the wave velocity of the bending wave will gradually decrease to zero as the thickness decreases.

[0004] Generally speaking, a one-dimensional acoustic black hole structure is a beam structure. Rotating it along the z-axis creates a two-dimensional acoustic black hole structure. This structure concentrates the energy of vibrational bending waves at the edges of the structure. Adding damping material to these edges effectively absorbs and dissipates the vibration energy. Existing acoustic black hole structures are primarily embedded. Hollowing out or removing these structures significantly reduces the strength and stiffness of the platform's splint structure, potentially compromising its stability.

[0005] Therefore, in the process of vibration and noise reduction of the sonar platform splint structure, it is very important to design a splint double-disc vibration reduction structure based on the acoustic black hole effect, which does not destroy the original structural characteristics, has a simple vibration reduction control structure, and has obvious control effect. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a double-disc vibration reduction structure and design method of the plywood based on the acoustic black hole effect. By applying a double-disc acoustic black hole component to the middle layer of the plywood, it supports the plywood layer without destroying the strength and rigidity of the plywood, thereby achieving the purpose of better wide-band, multi-frequency point vibration reduction and noise reduction.

[0007] The object of the present invention is achieved through the following technical solution: a splint double-disc vibration reduction structure based on the acoustic black hole effect, comprising:

[0008] The plywood structure comprises an upper plywood plate and a lower plywood plate spaced apart from the upper plywood plate, with a plywood middle layer formed therebetween;

[0009] A plurality of double-disc acoustic black hole components are evenly distributed in an array in the middle layer of the plywood. An upper circular boss is provided on the upper portion of each double-disc acoustic black hole component. The top of the upper circular boss forms an upper circular boss plane, and the upper surface between the upper circular boss plane and the edge of the double-disc acoustic black hole component is a rotational arc surface. A lower circular boss is provided on the lower portion of each double-disc acoustic black hole component. The bottom of the lower circular boss forms a lower circular boss plane, and the lower surface between the lower circular boss plane and the edge of the double-disc acoustic black hole component is also a rotational arc surface; and

[0010] The damping ring member comprises an upper damping ring member adhered to the edge of the upper surface and a lower damping ring member adhered to the edge of the lower surface, and is used for absorbing and dissipating the vibration bending wave energy transmitted from the clamping plate structure.

[0011] As a further technical solution, a rigid array is constructed between multiple double-disc acoustic black hole components and connected in the middle layer of the splint. Each double-disc acoustic black hole component is symmetrical up and down, and the upper circular boss plane is tightly attached to the upper plate of the splint, and the lower circular boss plane is tightly attached to the lower plate of the splint.

[0012] As a further technical solution, the distance H between the upper surface and the lower surface of the double-disc acoustic black hole component satisfies the following formula:

[0013]

[0014] Where x represents the distance from the left edge of the double-disk acoustic black hole component; x1 represents the horizontal axis distance from the left edge of the acoustic black hole to the left end point of the circular boss plane, x2 represents the horizontal axis distance from the left edge of the acoustic black hole to the right end point of the circular boss plane, and x3 represents the horizontal axis distance from the left edge to the right edge of the acoustic black hole; 2h0 represents the edge thickness of the component, 2h abh represents the thickness between the upper and lower surfaces of the circular boss area; ε represents the slope of the acoustic black hole profile, ε>0; m represents the order of the acoustic black hole, 2≤m≤3.

[0015] As a further technical solution, the upper plate of the splint and the lower plate of the splint are connected by supporting ribs.

[0016] As a further technical solution, the thickness between the upper circular boss plane and the lower circular boss plane is twice the thickness of the single plate of the upper plate or the lower plate of the splint, and the thickness between the upper circular boss plane and the lower circular boss plane is ten times the thickness of the edge of the double-disc acoustic black hole component; the thickness of the damping ring is four times the thickness of the edge of the double-disc acoustic black hole component.

[0017] As a further technical solution, the material of the splint structure and the double-disc acoustic black hole component is aluminum alloy; the material of the damping ring is rubber or foam plastic or high-damping alloy.

[0018] The present invention also provides a design method for a splint double-disc vibration damping structure based on the acoustic black hole effect, comprising the following steps:

[0019] S1. Establishing a finite element simulation model of the splint double-disc vibration damping structure using finite element simulation software;

[0020] S2. Optimizing geometric parameters of the double-disc acoustic black hole component of the double-disc splint vibration damping structure using finite element simulation software to obtain optimal parameters;

[0021] S3. Input the optimal parameters obtained in S2 into the finite element simulation calculation software to perform a finite element model damping characteristic analysis, and compare the modal damping characteristics of the splint structure without the double-disc acoustic black hole component installed and the splint structure with the double-disc acoustic black hole component installed;

[0022] S4. Perform vibration reduction performance analysis on the finite element model and compare the surface mean square vibration velocity of the splint structure without the double-disc acoustic black hole component installed and the splint structure with the double-disc acoustic black hole component installed.

[0023] In S2, the geometric parameter optimization includes the following steps:

[0024] S2.1. Change the edge thickness of the double-disc acoustic black hole component, compare the surface mean square velocity of the splint under different edge thicknesses, and determine the optimal edge thickness value;

[0025] S2.2. Change the damping layer thickness of the damping ring, compare the mean square vibration velocity of the splint surface under different damping layer thicknesses, and determine the optimal thickness of the damping layer;

[0026] S2.3. Change the number of arrays of the double-disk acoustic black hole components, compare the surface mean square vibration velocity of the splint under different array numbers, and determine the optimal number of arrays.

[0027] The beneficial effects of the present invention are:

[0028] 1. A splint-disc vibration damping structure based on the acoustic black hole effect. In the uniform area of the circular boss plane of the vibration damping structure, the double-disc acoustic black hole component concentrates the bending wave energy on the splint to the edge of the acoustic black hole component through the acoustic black hole effect. The damping rings adhered to the upper and lower surface edges of the double-disc acoustic black hole component absorb and dissipate the vibration bending wave energy.

[0029] 2. This vibration reduction structure supports the plywood structure without cutting the plywood, which can effectively suppress vibration energy and has broad application prospects in vibration and noise reduction control of a series of plywood structures such as ship equipment and civil transportation;

[0030] 3. Use finite element simulation software to optimize geometric parameters. Through repeated adjustments, the optimal parameters can be obtained to improve the vibration reduction effect;

[0031] 4. Applying double-disc acoustic black hole components to the middle layer of the plywood can support the plywood layer without destroying the strength and rigidity of the plywood, thereby achieving better wide-band and multi-frequency vibration and noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0033] Figure 2 It is a schematic cross-sectional structural diagram of a vibration reduction unit in the present invention.

[0034] Figure 3 It is a schematic diagram of the three-dimensional structure of the double-disc acoustic black hole component and the damping ring component in the present invention.

[0035] Figure 4 It is a schematic diagram of the three-dimensional structure of the double-disc acoustic black hole component in the present invention.

[0036] Figure 5 It is a structural schematic diagram of the damping ring member in the present invention.

[0037] Figure 6 Schematic diagram of the thickness of the longitudinal section of the double-disc acoustic black hole component in the present invention (the abscissa x represents the distance from the left edge of the double-disc acoustic black hole component, and the ordinate H represents the thickness of the double-disc acoustic black hole component).

[0038] Figure 7 This is a comparison chart of the modal loss factors of the splints with and without the double-disc acoustic black hole component installed in the present invention.

[0039] Figure 8 This is a comparison chart of the vibration reduction performance of the splint with and without the double-disc acoustic black hole component installed in the present invention.

[0040] Explanation of the accompanying drawings: splint structure 1, splint upper plate 1-1, splint lower plate 1-2, supporting ribs 1-3, splint middle layer 1-4, double-disc acoustic black hole component 2, upper surface 2-1, lower surface 2-2, upper circular boss plane 2-3, lower circular boss plane 2-4, damping circular ring 3, upper damping ring 3-1, lower damping ring 3-2. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings:

[0042] Example 1: As shown in the attached Figures 1 to 6 As shown, a splint double-disc vibration reduction structure based on the acoustic black hole effect includes a splint structure 1, a splint upper plate 1-1, a splint lower plate 1-2, support ribs 1-3, a splint middle layer 1-4, a double-disc acoustic black hole component 2, an upper surface 2-1, a lower surface 2-2, an upper circular boss plane 2-3, a lower circular boss plane 2-4, a damping circular ring 3, an upper damping ring 3-1 and a lower damping ring 3-2.

[0043] Reference Attachment Figure 1 、 2 The plywood structure 1 includes an upper plywood plate 1-1 and a lower plywood plate 1-2, which are arranged in an upper and lower manner and form a plywood middle layer 1-4 therebetween.

[0044] A plurality of double-disc acoustic black hole components 2 (eight in this embodiment, but other numbers are also possible) are evenly distributed in the middle layer 1-4 of the plywood in the form of an array. An upper circular boss is provided on the upper portion of each double-disc acoustic black hole component 2, and the top of the upper circular boss forms an upper circular boss plane 2-3, and the area between the upper circular boss plane 2-3 and the edge of the double-disc acoustic black hole component 2 serves as the upper surface 2-1 (of the double-disc acoustic black hole component 2). A lower circular boss is provided on the lower portion of each double-disc acoustic black hole component 2, and the bottom of the lower circular boss forms a lower circular boss plane 2-4, and the area between the lower circular boss plane 2-4 and the edge of the double-disc acoustic black hole component 2 serves as the lower surface 2-2 (of the double-disc acoustic black hole component 2), and both the upper surface 2-1 and the lower surface 2-2 are rotating arc surfaces.

[0045] like Figure 3 、 4 As shown in Figures 5 and 6, the damping ring 3 is adhered to the outer edge of the double-disc acoustic black hole component 2. The damping ring 3 includes an upper damping ring 3-1 and a lower damping ring 3-2. The upper damping ring 3-1 is adhered to the edge of the upper surface 2-1 of the double-disc acoustic black hole component 2, and the lower damping ring 3-2 is adhered to the edge of the lower surface 2-2 of the double-disc acoustic black hole component 2. The damping ring 3 can absorb and dissipate the vibration bending wave energy transmitted from the clamping structure 1.

[0046] Furthermore, a rigid array is constructed between the eight double-disc acoustic black hole components 2, a certain gap is left between adjacent double-disc acoustic black hole components 2, and they are connected in the middle layer 1-4 of the splint. Each double-disc acoustic black hole component 2 is symmetrical in the upper and lower layers, and the upper circular boss plane 2-3 is in close contact with the upper plate 1-1 of the splint (the lower surface), and at the same time, the lower circular boss plane 2-4 is in close contact with the lower plate 1-2 of the splint (the upper surface).

[0047] like Figure 6 As shown, the distance H between the upper surface 2-1 and the lower surface 2-2 of the double-disc acoustic black hole component 2 satisfies the following formula:

[0048]

[0049] Wherein, x represents the distance from the left edge of the double-disk acoustic black hole component 2; x1 represents the horizontal axis distance from the left edge of the acoustic black hole to the left end point of the circular boss plane, x2 represents the horizontal axis distance from the left edge of the acoustic black hole to the right end point of the circular boss plane, and x3 represents the horizontal axis distance from the left edge to the right edge of the acoustic black hole; 2h0 represents the edge thickness of the component, 2h abh represents the thickness between the upper and lower surfaces of the circular boss area; ε represents the slope of the acoustic black hole profile, ε>0; m represents the order of the acoustic black hole, 2≤m≤3.

[0050] Preferably, if Figure 2 As shown, the upper plate 1-1 and the lower plate 1-2 are connected by support ribs 1-3. The thickness between the upper circular boss plane 2-3 and the lower circular boss plane 2-4 is twice the thickness of the single plate of the upper plate 1-1 or the lower plate 1-2, and the thickness between the upper circular boss plane 2-3 and the lower circular boss plane 2-4 is ten times the thickness of the edge of the double-disc acoustic black hole component 2. The thickness of the damping ring 3 is four times the thickness of the edge of the double-disc acoustic black hole component 2. The material of the splint structure 1 and the double-disc acoustic black hole component 2 is aluminum alloy; the material of the damping ring 3 is rubber, foam plastic, or high-damping alloy.

[0051] Example 2: A design method for a double-disc plywood vibration damping structure based on the acoustic black hole effect, comprising the following steps:

[0052] S1. Establishing a finite element simulation model of the splint double-disc vibration damping structure using finite element simulation software (Comsol Mutiphysics);

[0053] S2. Optimizing the geometric parameters of the double-disc acoustic black hole component 2 of the double-disc vibration damping structure of the splint using finite element simulation software to obtain optimal parameters;

[0054] S3. Input the optimal parameters obtained in S2 into the finite element simulation calculation software to perform a finite element model damping characteristic analysis, and compare the modal damping characteristics of the plywood structure 1 without the double-disc acoustic black hole component 2 installed and the plywood structure 1 with the double-disc acoustic black hole component 2 installed;

[0055] S4. Perform vibration reduction performance analysis of the finite element model and compare the surface mean square vibration velocity of the splint structure 1 without the double-disc acoustic black hole component 2 and the splint structure 1 with the double-disc acoustic black hole component 2 installed.

[0056] Furthermore, in S2, the geometric parameter optimization includes the following steps:

[0057] S2.1. Change the edge thickness of the double-disc acoustic black hole component 2, compare the mean square vibration velocity of the (smaller) splint surface at different edge thicknesses, and determine the optimal edge thickness value;

[0058] S2.2. Change the damping layer thickness of the damping ring 3, compare the mean square vibration velocity of the splint surface at different damping layer thicknesses (smaller), and determine the optimal thickness of the damping layer;

[0059] S2.3. Change the number of arrays of the double-disc acoustic black hole component 2, compare the mean square vibration velocity of the (smaller) splint surface under different numbers of arrays, and determine the optimal number of arrays.

[0060] During implementation, the length of the plywood structure 1 is selected to be 1m, the width is 0.5m, and the thickness is 0.02m (the thickness of the upper and lower single-layer boards, i.e., the upper plywood board 1-1 and the lower plywood board 1-2, is 0.005m, and the thickness of the supporting ribs 1-3 is 0.01m).

[0061] The geometric parameters are optimized by using the finite element simulation software ComsolMutiphysics, and the thickness of the uniform circular boss area of the double-disc acoustic black hole component 2 (i.e., the thickness between the upper circular boss plane 2-3 and the lower circular boss plane 2-4) is selected to be 0.01m, the edge thickness of the double-disc acoustic black hole component 2 is 0.001m, and the radius of the double-disc acoustic black hole component 2 is 0.1m.

[0062] The materials of the splint structure 1 and the double-disc acoustic black hole component 2 are aluminum alloy, and the material of the damping ring component 3 is one of rubber, foam plastic and high-damping alloy.

[0063] At the same time, in order to study the vibration reduction performance after applying the double-disc acoustic black hole component, the present invention selects a splint with exactly the same geometric dimensions but not applied with the double-disc acoustic black hole component for comparative verification.

[0064] The working principle of the present invention is as follows: when an external point excitation is applied to the surface of the splint structure 1, the splint structure 1 vibrates. At this time, the vibrating bending waves within the splint structure 1 pass through the uniform circular boss area of the double-disc acoustic black hole component 2 (applied to the splint intermediate layer 1-4), and are then transmitted to the edge of the double-disc acoustic black hole component 2. According to the acoustic black hole effect, when the bending waves are transmitted to the thinnest part of the edge of the acoustic black hole component 2, the cumulative phase of the bending waves reaches a maximum, and the equivalent wave velocity is reduced to a minimum. The bending waves are thus concentrated at the edge of the double-disc acoustic black hole component 2. The damping ring members 3 (upper damping ring 3-1 and lower damping ring 3-2) adhered to the double-disc acoustic black hole component 2 (upper surface 2-1 and lower surface 2-2) effectively absorb and dissipate the vibration energy transmitted from the splint.

[0065] Next, a finite element simulation model of the splint double-disc vibration reduction structure is established using the finite element simulation software ComsolMutiphysics. The geometric parameters of the acoustic black hole component are optimized, and the structural damping characteristics and vibration reduction performance before and after the application of the acoustic black hole component are calculated to verify the effectiveness of this vibration reduction structure.

[0066] 1. Optimization of acoustic black hole geometry parameters

[0067] Furthermore, the present invention optimizes the double-disc acoustic black hole component by the following steps, including the following process:

[0068] 1) First, the edge thickness of the acoustic black hole is changed, and the mean square velocity of the smaller splint surface under different parameters is compared to determine the optimal thickness value. The edge thickness of the acoustic black hole is selected as 0.1 times the thickness of the uniform circular boss of the acoustic black hole.

[0069] 2) Secondly, the thickness of the damping layer was changed, and the mean square velocity of the smaller splint surface under different parameters was compared to determine the optimal thickness value. Finally, the thickness of the damping ring was selected to be three times the thickness of the edge of the acoustic black hole.

[0070] 3) Finally, the number of acoustic black hole component arrays was changed, and the mean square velocity of the smaller splint surface under different array numbers was compared to determine the optimal number. Finally, the number of acoustic black hole component arrays was selected as 8.

[0071] Through the above-mentioned geometric parameter optimization, the thickness of the uniform circular boss area of the double-disc acoustic black hole component 2 in the finally designed platform vibration reduction structure is 0.01m, the edge thickness of the double-disc acoustic black hole component 2 is 0.001m, and the thickness of the upper damping ring 3-1 and the lower damping ring 3-2 is 0.003m.

[0072] 2. Analysis of damping characteristics of finite element model

[0073] Depend on Figure 7It can be seen that the splint double-disc vibration damping structure based on the acoustic black hole effect in the embodiment of the present invention can greatly improve the inherent damping of the structure. After applying the acoustic black hole component, the modal damping characteristics of the system structure are effectively improved, especially in the frequency band of 500-1400Hz, the improvement effect is as high as 3-15 times, indicating that the vibration damping structure can effectively absorb and suppress the vibration bending waves in the splint structure.

[0074] 3. Finite element model vibration reduction performance analysis

[0075] Depend on Figure 8 It can be seen that the surface mean square vibration velocity of the splint double-disc vibration damping structure based on the acoustic black hole effect in the embodiment of the present invention is effectively reduced in a wide frequency band (300-1700Hz), especially at the peak of the 400-1000Hz frequency band and the peak of the frequency band after 1400Hz. The surface mean square vibration velocity (MSV) of the splint double-disc vibration damping structure based on the acoustic black hole effect in the embodiment of the present invention is compared with the surface mean square vibration velocity (MSV) of the splint without the acoustic black hole component. The peak value can be reduced by more than 5dB in the entire frequency band, and most of the peak values can be reduced by more than 10dB, which has excellent vibration reduction effect.

[0076] The splint-disc vibration reduction structure based on the acoustic black hole effect proposed in the present invention can effectively control the vibration noise of the sonar platform splint structure, support the splint structure without destroying the strength and rigidity of the splint structure, and realize efficient absorption and suppression of vibration bending wave energy. It has the technical advantages of simple structure and excellent vibration reduction performance, and has broad application prospects in the vibration and noise control of underwater vehicle platforms that widely use splints and other structures.

[0077] It is understandable that for those skilled in the art, any equivalent replacement or change to the technical solution and inventive concept of the present invention should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A double-disc plywood vibration reduction structure based on acoustic black hole effect, characterized in that: include: The splint structure (1) comprises an upper splint plate (1-1) and a lower splint plate (1-2) spaced apart from the upper splint plate (1-1), with a splint middle layer (1-4) formed therebetween. A plurality of double-disc acoustic black hole components (2) are uniformly distributed in an array on a sandwich panel middle layer (1-4); an upper circular boss is provided on the upper portion of each double-disc acoustic black hole component (2); the top of the upper circular boss forms an upper circular boss plane (2-3); and the upper surface (2-1) between the upper circular boss plane (2-3) and the edge of the double-disc acoustic black hole component (2) is a rotational arc surface; a lower circular boss is provided on the lower portion of each double-disc acoustic black hole component (2); the bottom of the lower circular boss forms a lower circular boss plane (2-4); and the lower surface (2-2) between the lower circular boss plane (2-4) and the edge of the double-disc acoustic black hole component (2) is also a rotational arc surface; as well as The damping circular ring member (3) comprises an upper damping ring member (3-1) adhered to the edge of the upper surface (2-1) and a lower damping ring member (3-2) adhered to the edge of the lower surface (2-2), and is used for absorbing and dissipating vibration bending wave energy transmitted from the clamping plate structure (1).

2. The double-disc plywood vibration damping structure based on the acoustic black hole effect according to claim 1 is characterized in that: A rigid array is constructed between a plurality of the double-disc acoustic black hole components (2) and connected in the middle layer (1-4) of the splint. Each double-disc acoustic black hole component (2) is symmetrical in the upper and lower directions, and the upper circular boss plane (2-3) is in close contact with the upper plate (1-1) of the splint, and the lower circular boss plane (2-4) is in close contact with the lower plate (1-2) of the splint.

3. The double-disc plywood vibration damping structure based on the acoustic black hole effect according to claim 1 is characterized in that: The distance H between the upper surface (2-1) and the lower surface (2-2) of the double-disc acoustic black hole component (2) satisfies the following formula: Wherein, x represents the distance from the left edge of the double-disk acoustic black hole component (2); x1 represents the horizontal axis distance from the left edge of the acoustic black hole to the left end point of the circular boss plane, x2 represents the horizontal axis distance from the left edge of the acoustic black hole to the right end point of the circular boss plane, and x3 represents the horizontal axis distance from the left edge to the right edge of the acoustic black hole; 2h0 represents the edge thickness of the component, 2h abh represents the thickness between the upper and lower surfaces of the circular boss area; ε represents the slope of the acoustic black hole profile, ε>0; m represents the order of the acoustic black hole, 2≤m≤3.

4. The double-disc plywood vibration damping structure based on the acoustic black hole effect according to claim 1 is characterized in that: The upper splint plate (1-1) and the lower splint plate (1-2) are connected via support ribs (1-3).

5. The double-disc plywood vibration damping structure based on the acoustic black hole effect according to claim 1 is characterized in that: The thickness between the upper circular boss plane (2-3) and the lower circular boss plane (2-4) is twice the thickness of a single plate of the clamping plate upper plate (1-1) or the clamping plate lower plate (1-2), and the thickness between the upper circular boss plane (2-3) and the lower circular boss plane (2-4) is ten times the thickness of the edge of the double-disc acoustic black hole component (2); the thickness of the damping circular ring member (3) is four times the thickness of the edge of the double-disc acoustic black hole component (2).

6. The double-disc plywood vibration damping structure based on the acoustic black hole effect according to claim 1 is characterized in that: The material of the splint structure (1) and the double-disc acoustic black hole component (2) is aluminum alloy; the material of the damping ring component (3) is rubber, foam plastic, or high-damping alloy.

7. A design method for a double-disc plywood vibration damping structure based on the acoustic black hole effect, characterized in that: The following steps are involved: S1. Establishing a finite element simulation model of the splint double-disc vibration damping structure using finite element simulation software; S2. Optimizing the geometric parameters of the double-disc acoustic black hole component (2) of the double-disc vibration damping structure using finite element simulation software to obtain optimal parameters; S3, inputting the optimal parameters obtained in S2 into the finite element simulation calculation software, performing a finite element model damping characteristic analysis, and comparing the modal damping characteristics of the splint structure (1) without the double-disc acoustic black hole component (2) installed and the splint structure (1) with the double-disc acoustic black hole component (2) installed; S4. Perform a finite element model vibration reduction performance analysis and compare the surface mean square vibration velocity of the splint structure (1) without the double-disc acoustic black hole component (2) installed and the splint structure (1) with the double-disc acoustic black hole component (2) installed.

8. The design method of the splint double-disc vibration damping structure based on the acoustic black hole effect according to claim 7 is characterized in that: In S2, the geometric parameter optimization includes the following steps: S2.

1. Change the edge thickness of the double-disc acoustic black hole component (2), compare the mean square vibration velocity of the splint surface under different edge thicknesses, and determine the optimal edge thickness value; S2.2, changing the thickness of the damping layer of the damping ring (3), comparing the mean square vibration velocity of the splint surface under different damping layer thicknesses, and determining the optimal thickness value of the damping layer; S2.

3. Change the number of arrays of the double-disk acoustic black hole component (2), compare the mean square vibration velocity of the splint surface under different numbers of arrays, and determine the optimal number of arrays.

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