Acoustic black hole elastic coupling

Abstract

The application belongs to the technical field of marine couplings, and particularly relates to an acoustic black hole elastic coupling, which comprises a damping assembly and an intermediate shaft, one end of the damping assembly is connected with the intermediate shaft, and the other end is connected with a transmission shaft; the damping assembly has multiple elastic element groups with different thicknesses, each elastic element group comprises multiple elastic elements and multiple gaskets for spacing the adjacent elastic elements, the adjacent elastic elements and the gaskets located outside the centers and inside the edges of the adjacent elastic elements can form closed air cavities in the spacing areas of the adjacent elastic elements, and the two end faces of the elastic elements are both coated with damping structures; the contact surfaces of the elastic elements and the gaskets are both coated with insulators; the acoustic black hole energy gathering effect, the damping and vibration reduction technology, the influence of the gas damping and stiffness in the air cavities between the elastic elements, and the change of the thicknesses of the elastic elements and the air cavities are utilized to increase the resonance bandwidth, consume a large amount of vibration energy, and reduce the effective transmission of the vibration.

Description

Technical Field

[0001] This invention belongs to the technical field of marine couplings, and more specifically, relates to an acoustic black hole elastic coupling. Background Technology

[0002] Couplings are used in marine power transmission systems to transmit power and torque while also providing angular compensation and regulating the natural frequency of the transmission system, thereby improving its torsional vibration characteristics and achieving vibration reduction and noise reduction. Flexible couplings are highly versatile. The elastic element assembly is a key component of the flexible coupling. During operation, the elastic element assembly typically blocks some vibration waves from being transmitted to the intermediate shaft. Therefore, in large marine motor drive transmission systems, the performance of the elastic element assembly in the flexible coupling determines the overall performance of the coupling. Existing diaphragm couplings exhibit significant amplitude vibration in the low-frequency range, resulting in poor vibration reduction. They also rarely consider electrical insulation, making them prone to damage and shortening their service life. Therefore, the design of the diaphragm assembly in flexible couplings has significant engineering application value.

[0003] The patent with publication number CN217440622U authorizes a high-strength, easy-to-install single diaphragm coupling. It places two diaphragm assemblies inside a connecting sleeve, which prevents the two diaphragm assemblies from contacting the outside, thus improving the service life of the diaphragm assemblies. The disadvantage is that it cannot provide significant vibration damping.

[0004] Patent CN109027029B discloses a low-vibration diaphragm coupling. Several discs are spaced apart on the spindle of a thin-walled sleeve. A damper is installed between the discs and the inner wall of the thin-walled sleeve. A metal diaphragm is circumferentially fitted on the other end of the splined sleeve. The outer side of the metal diaphragm is connected to the corresponding half coupling through a laminate plate. This reduces the over-critical vibration amplitude of the thin-walled sleeve inside the diaphragm coupling and improves the stability of the coupling. The disadvantage is that this coupling mainly optimizes the structure of the thin-walled sleeve in the middle and does not involve the structural optimization of the metal diaphragm assembly. It is also suitable for high-speed and high-power conditions. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by proposing a novel acoustic black hole elastic coupling. Its design satisfies both power transmission and composite vibration reduction, and has broad application prospects. The elastic element incorporates an acoustic black hole and a damping structure. By utilizing the energy concentration effect of the acoustic black hole, damping and vibration reduction technology, the influence of gas damping and stiffness in the air cavity between the elastic elements, and the variation in the thickness of the elastic element and the air cavity, the resonance bandwidth is increased, a large amount of vibration energy is consumed, and the effective transmission of vibration is reduced.

[0006] To achieve the above objectives, the present invention provides an acoustic black hole elastic coupling, comprising a vibration damping component and an intermediate shaft, wherein one end of the vibration damping component is connected to the intermediate shaft and the other end is externally connected to a drive shaft;

[0007] The vibration damping assembly has multiple sets of elastic element groups of different thicknesses, and the multiple sets of elastic element groups are arranged side by side. Each elastic element group includes multiple elastic elements and washers for spaced installation of adjacent elastic elements. The elastic element is a disc structure with a central hole. Each set of washers includes an inner washer and an outer washer. Each inner washer is installed on the outer edge of the central hole of an elastic element, and each outer washer is installed on the inner side of the outer edge of an elastic element.

[0008] Each set of outer washer, inner washer, and two adjacent elastic elements forms a closed cavity;

[0009] Both end faces of the elastic element are covered with damping structures.

[0010] Furthermore, the elastic element group includes at least two groups with different thicknesses, wherein the elastic element, the washer, and the cavity in each group have the same thickness and gradually increase in thickness toward the intermediate axis.

[0011] Furthermore, the two end faces of the elastic element are arranged in an alternating array of multiple conical concave acoustic black holes from the center outward along different circumferential radii;

[0012] The cone diameter of the acoustic black holes distributed in the inner radial and outer radial directions on one end plane of the elastic element increases progressively, while the cone diameter of the acoustic black holes distributed in the inner radial and outer radial directions on the other end plane of the elastic element decreases progressively.

[0013] The damping structure is installed inside the acoustic black hole.

[0014] Furthermore, the vibration damping assembly has two identical structures, and the two vibration damping assemblies are symmetrically installed on the left and right sides of the intermediate shaft;

[0015] The vibration damping assembly includes an elastic element assembly, a first flange, and a second flange. The elastic element assembly has a ring-shaped overall structure and consists of two identical components. The first flange and the second flange are coaxially arranged from the end of the intermediate shaft outwards.

[0016] One end of the first flange is fixedly installed to the end of the intermediate shaft, and the other end is coaxially connected to one of the elastic element assemblies; one end of the second flange is coaxially connected to another elastic element assembly, and the other end is externally connected to a drive shaft;

[0017] The two elastic element assemblies are arranged side by side and their edges are connected and mounted in series by fasteners.

[0018] Furthermore, the elastic element group is assembled into multiple groups of elastic elements with different thicknesses.

[0019] Furthermore, the damping structure includes a viscous material and damping particles;

[0020] The viscous material is applied to the conical concave surface of the acoustic black hole, the structure of the damping particles matches the structure of the acoustic black hole, and the damping particles are fixed inside the acoustic black hole by the viscous material.

[0021] The damping particles are made of rubber.

[0022] Furthermore, the number of acoustic black holes distributed along the same circumferential direction on the elastic element is 6-10, and the number of layers of acoustic black holes distributed along different circumferential radii on the elastic element is 2-4.

[0023] Furthermore, the thickness of the washer is half the thickness of the adjacent elastic element;

[0024] The elastic element is made of spring steel, and the washer is made of copper.

[0025] Furthermore, the contact surfaces of the elastic element and the washer, as well as the fastener, are all covered with an insulator; the surface of the insulator is made of epoxy resin, and the internal material of the insulator is made of fiberglass geogrid.

[0026] Furthermore, the cross-section of the acoustic black hole satisfies h(x) = εx m The decay law of +h0, where h is the thickness of the acoustic black hole structure at x, ε is a constant, h0 is the cutoff thickness of the acoustic black hole structure, h0 is 0.4-0.8mm, and the power exponent m≥2 is a positive rational number;

[0027] The formula for calculating the constant ε is: In the formula, h is the thickness of the elastic element, and r is the radius of the acoustic black hole;

[0028] The formula for calculating the radius r of an acoustic black hole is: In the formula, E is the elastic modulus, ρ is the density, υ is the Poisson's ratio, and f is the characteristic frequency.

[0029] The beneficial effects of this invention are:

[0030] First, the acoustic black hole elastic coupling of the present invention consists of an intermediate shaft and vibration damping components located at both ends of the intermediate shaft. The vibration damping components have multiple sets of elastic element groups with different thicknesses. Each elastic element group includes multiple elastic elements and washers for spaced installation of adjacent elastic elements. The adjacent elastic elements and the washers located on the outer side of the center and the inner side of the edge of the adjacent elastic elements can form a closed air cavity between the spaced areas of the adjacent elastic elements. Its design satisfies the power transmission while achieving the purpose of composite vibration damping, and has broad application prospects. The elastic elements have acoustic black holes and damping structures. By utilizing the energy concentration effect of acoustic black holes and damping vibration reduction technology, the influence of gas damping and stiffness in the air cavity between elastic elements, and the change in the thickness of the elastic elements and the air cavity, the resonance bandwidth is increased, a large amount of vibration energy is consumed, and the effective transmission of vibration is reduced.

[0031] Secondly, the multiple sets of elastic elements of different thicknesses in this invention broaden the vibration reduction frequency band and make the vibration reduction effect more obvious. The average vibration reduction effect in the 10-2000Hz frequency band can reach 25dB.

[0032] Third, the thickness of the elastic element and the thickness of the air cavity in the elastic element group of the present invention increase with the increase of the number of groups, so that the resonance frequency shifts to a higher frequency and the shift amplitude gradually increases. The resonance frequency shifts to a higher frequency by a maximum of about 15Hz, which effectively reduces the number of resonances and extends the service life of the coupling.

[0033] Fourth, the elastic element of the present invention has multiple acoustic black holes of different diameters on both ends, which changes the vibration reduction starting frequency and broadens the vibration reduction frequency band of the acoustic black holes. A damping layer is laid on the surface of the acoustic black holes. When vibration is transmitted through the elastic element, the vibration energy is concentrated at the acoustic black holes. The damping layer at this location is used to absorb and dissipate the vibration energy, thereby reducing the effective transmission of vibration.

[0034] Fifth, the acoustic black hole of the present invention can enhance the elastic deformation capability of the elastic element, avoid damage to the elastic element due to installation problems, and extend the service life of the elastic element.

[0035] Sixth, the contact surfaces of the bolts on the outer ring of the elastic element group of the present invention with the elastic element group and the gasket are covered with an insulator, and the contact surfaces of the gasket and the elastic element group are covered with an insulator. The internal material is glass fiber geogrid, and the surface is coated with epoxy resin. It has excellent properties such as high strength, high temperature resistance and anti-aging. In the motor drive transmission shaft system, it does not affect the torque transmission and has excellent electrical insulation.

[0036] Seventh, the present invention has a compact structure, does not affect the structural strength of the elastic element group and the elastic coupling, and is easy to manufacture and install. Attached Figure Description

[0037] Figure 1This is a cross-sectional view of the overall structure of the acoustic black hole elastic coupling of the present invention;

[0038] Figure 2 yes Figure 1 A magnified view of a portion of A;

[0039] Figure 3 This is a partially enlarged view of B in this invention;

[0040] Figure 4 This is a schematic diagram of one side of the elastic element of the present invention. Figure 1 ;

[0041] Figure 5 This is a schematic diagram of one side of the elastic element of the present invention. Figure 2 ;

[0042] Figure 6 This is a cross-sectional view of the elastic element of the present invention;

[0043] Figure 7 This is a schematic cross-sectional view of the acoustic black hole of the present invention;

[0044] Figure 8 This is a schematic diagram of the damping particles and adhesive material of the present invention;

[0045] Figure 9 This is a schematic diagram comparing the vibration level drop in Embodiment 2 of the present invention.

[0046] Among them, 1-Vibration damping component; 10-Gasket; 11-Fully threaded screw; 12-Elastic element assembly; 120-Elastic element; 1200-Acoustic black hole; 1201-Adhesive material; 1202-Damping particles; 121-Isolation gasket; 122-Air cavity; 13-First flange; 14-Second flange; 15-T-shaped cylindrical pin; 16-Short bolt; 2-Intermediate shaft. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] like Figure 1 , Figure 2As shown, the present invention provides an acoustic black hole elastic coupling, including a vibration damping component 1 and an intermediate shaft 2. The intermediate shaft 2 is composed of a hollow cylinder and an annular disk extending outward along the edges of both ends of the hollow cylinder. The intermediate shaft 2 is arranged horizontally along its axis. There are two vibration damping components 1 with the same structure, and the two vibration damping components 1 are symmetrically installed on the left and right sides of the intermediate shaft 2 by bolts.

[0049] Taking the vibration damping assembly 1 on one side of the intermediate shaft 2 as an example, the vibration damping assembly 1 includes an elastic element assembly 12, a first flange 13, and a second flange 14.

[0050] A first flange 13, a second flange 14, and an external drive shaft are arranged coaxially outward from the end of the intermediate shaft 2. The first flange 13 is a stepped flange, composed of multiple coaxial circular steps of different diameters, arranged in descending order of diameter. The second flange 14 is an H-beam flange, consisting of a cylinder with a central hole, annular discs at both ends of the cylinder, and two circular steps with increasing diameters. The end of the second flange 14 with the annular disc is externally connected to the coaxially arranged drive shaft. The circular step with the smallest diameter on the second flange 14 is coaxially adjacent to and has the same diameter as the circular step with the smallest diameter on the first flange 13. The circular step with the largest diameter on the first flange 13 is bolted to the annular disc of the intermediate shaft 2.

[0051] Preferably, the intermediate shaft 2, the first flange 13, and the second flange 14 are made of alloy steel.

[0052] The elastic element assembly 12 has two identical structures. The overall structure of the elastic element assembly 12 is annular, with a central hole in the middle. The central holes of the two elastic element assemblies 12 are respectively fitted onto the circular steps with the smallest diameter of the first flange 13 and the second flange 14. The edges of the two elastic element assemblies 12 are fastened together side by side.

[0053] like Figure 3As shown, the elastic element assembly 12 consists of multiple sets of elastic elements of different thicknesses. These sets of elastic elements gradually increase in thickness towards the central axis 2, thus broadening the frequency range for absorbing vibrations. The elastic element assembly includes an elastic element 120 and an insulating washer 121, both of which are annular disk structures. The elastic element 120 has multiple first and second mounting holes arranged in a ring array. The first mounting hole is located outside the central hole of the elastic element 120, and the second mounting hole is located inside the outer edge of the outer edge of the elastic element 120. The distance between the second mounting hole and the center of the elastic element 120 is greater than the distance between the first mounting hole and the center of the elastic element 120. The isolation washer 121 includes a first isolation washer and a second isolation washer; the central hole of the first isolation washer is coaxial with the central hole of the elastic element 120 and has the same diameter, and the first isolation washer also has an opening that matches the first mounting hole, and the outer diameter of the first isolation washer is slightly larger than the distance from the center of the elastic element 120 to the outer edge of the first mounting hole; the second isolation washer has an opening that matches the second mounting hole, the inner diameter of the second isolation washer is slightly smaller than the distance from the center of the elastic element 120 to the inner edge of the second mounting hole, and the outer diameter of the second isolation washer is the same as the outer diameter of the isolation washer 121.

[0054] The elastic element 120 has various thicknesses, and multiple elastic elements 120 of the same thickness form a group of elastic element groups. The elastic element group assembly 12 includes at least two groups of elastic element groups. The elastic elements 120 and the isolation gaskets 121 are spaced apart and fitted onto the circular steps with the smallest diameter on the first flange 13 and the second flange 14. The isolation gaskets 121 and the two adjacent elastic elements 120 form a closed air cavity 122, which is used for vibration absorption. The thickness of the multiple elastic element groups and the thickness of the air cavity 122 gradually increase from the outer side of the acoustic black hole elastic coupling towards the intermediate shaft 2, which can change the vibration frequency from low frequency to high frequency, thereby changing the vibration frequency, effectively reducing the number of resonances, and extending the service life of the coupling.

[0055] The number of isolation washers 121 should be one more than the number of elastic elements 120. The thickness of the isolation washer 121 is half the thickness of the adjacent elastic element 120, and the outer diameter of the isolation washer 121 is the same as the outer diameter of the elastic element 120. Annular washers of the same diameter are respectively installed on the outer sides of the two outermost isolation washers 121 located in the elastic element assembly 12. These annular washers have openings that match the central hole, first mounting hole, and second mounting hole of the elastic element 120. These annular washers are used to seal both sides of the elastic element assembly 12.

[0056] Preferably, the elastic element 120 is made of spring steel, and the outermost annular washer of the isolation washer 121 and the elastic element assembly 12 is made of copper. The thickness of the elastic element 120 is 4-8 mm, and the thickness of the isolation washer 121 is 2-4 mm.

[0057] by Figure 3 Taking the illustrated state as an example, the elastic element assembly 12 includes two sets of elastic elements 120. One set of elastic elements 120 consists of 3 elastic elements with a thickness of 4 mm, and there are 4 isolation gaskets 121 adjacent to the elastic elements 120 with a thickness of 2 mm. The other set of elastic elements 120 consists of 3 elastic elements with a thickness of 6 mm, and there are 3 isolation gaskets 121 adjacent to the elastic elements 120 with a thickness of 3 mm.

[0058] The vibration damping assembly 1 also includes a gasket 10, a fully threaded screw 11, a T-shaped cylindrical pin 15, and a short bolt 16. The T-shaped cylindrical pin 15 has a central hole with internal threads. Multiple T-shaped cylindrical pins 15 are inserted into the first mounting hole of the elastic element assembly 12 from the side of the elastic element assembly 12 that is not in contact with the first flange 13 and the second flange 14. The pin head of the T-shaped cylindrical pin 15 presses against the elastic element assembly 12. The short bolt 16 is inserted through the shank of the T-shaped cylindrical pin 15 and tightened to fix the two elastic element assemblies 12 to the first flange 13 and the second flange 14 respectively.

[0059] Gaskets 10 are installed on both sides of the elastic element assembly 12. Each gasket 10 has a mounting hole. A fully threaded screw 11 passes through the mounting hole of the gasket 10, the second mounting hole of the elastic element 120, the opening of the second isolation gasket, and the opening of the annular gasket, thereby fixing the elastic element assembly 12, which is mounted on the first flange 13 and the second flange 14, side by side.

[0060] The contact surfaces of the shank of the fully threaded screw 11 and the washer 10 with the elastic element assembly 12 are all equipped with insulators. These insulators are disposed on the shank of the fully threaded screw 11 and the washer 10. The electrical insulation of the insulators prevents current from passing through the coupling when the motor drives the coupling, preventing current loss, avoiding unnecessary interference, and improving the service life of the coupling. The insulator located on the shank of the fully threaded screw 11 adopts a T-shaped structure, while the insulator located on the outer side of the washer 10 adopts a circular ring plate structure.

[0061] Preferably, the surface of the insulator is made of epoxy resin, and the internal material of the insulator is made of fiberglass geogrid.

[0062] like Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the elastic element 120 includes an acoustic black hole 1200. The acoustic black hole 1200 is used to concentrate vibration energy, enhance the elastic deformation capacity of the elastic element 120, prevent damage to the elastic element 120 due to installation problems, and extend the service life of the elastic element 120. The acoustic black hole 1200 is a conical concave surface. Multiple acoustic black holes 1200 are alternately distributed along the circumference on both end planes of the elastic element 120. The cone diameter of the acoustic black holes 1200 distributed in the inner radial and outer radial directions on one end plane of the elastic element 120 increases progressively, while the cone diameter of the acoustic black holes 1200 distributed in the inner radial and outer radial directions on the other end plane of the elastic element 120 decreases progressively. The centers of the acoustic black holes 1200 distributed opposite each other on the two end planes of the elastic element 120 are located at the same circumference radius. The different diameters of the acoustic black holes 1200 on the two end planes of the elastic element 120 can change the vibration reduction starting frequency and broaden the vibration reduction frequency band.

[0063] The cross-section of the acoustic black hole 1200 conforms to h(x) = εx m The decay pattern of +h0.

[0064] In the formula: h(x) is the thickness of the acoustic black hole structure at x, ε is a constant, h0 is the cut-off thickness of the acoustic black hole structure, h0 is 0.4-0.8mm, and the power exponent m≥2 is a positive rational number.

[0065] The formula for calculating ε is: In the formula: h is the thickness of the elastic element, and r is the radius of the acoustic black hole. The vibration reduction initiation frequency is affected by the acoustic black hole aggregation effect. E is the elastic modulus, ρ is the density, υ is the Poisson's ratio, and f is the characteristic frequency.

[0066] Preferably, the number of acoustic black holes 1200 distributed along the same circumferential direction on the elastic element 120 is 6-10, and the number of layers of acoustic black holes 1200 distributed along different circumferential radii on the elastic element 120 is 2-4.

[0067] by Figure 4 Taking the illustrated state as an example, the number of layers of acoustic black holes 1200 distributed along different circumferential radii on the left end face of the elastic element 120 is 3, the number of acoustic black holes 1200 distributed along the same circumferential direction on the elastic element 120 is 8, and the cone diameter of the acoustic black holes 1200 distributed along its inner radial and outer radial directions on one end plane of the elastic element 120 gradually increases. Figure 5Taking the illustrated state as an example, the number of layers of acoustic black holes 1200 distributed along different circumferential radii on the right end face of the elastic element 120 is 3, and the number of acoustic black holes 1200 distributed along the same circumferential direction on the elastic element 120 is 8. The cone diameters of the acoustic black holes 1200 distributed along their inner and outer radial directions on one end plane of the elastic element 120 gradually decrease. The cone diameters of the second layer of acoustic black holes 1200 distributed on the left and right end faces of the elastic element 120 are equal.

[0068] like Figure 8 As shown, the elastic element 120 also includes an adhesive material 1201 and damping particles 1202. The adhesive material 1201 is laid on the conical concave surface of the acoustic black hole 1200. The structure of the damping particles 1202 matches the structure of the acoustic black hole 1200. The damping particles 1202 are fixed inside the acoustic black hole 1200 by the adhesive material 1201. The damping particles 1202 are made of rubber material.

[0069] Damping particles 1202 on acoustic black holes 1200 of different diameters can absorb vibrations of different frequencies, reducing the effective transmission of vibrations.

[0070] Example 1:

[0071] Taking a single elastic element 120 as an example, in this embodiment, the cutoff thickness of the acoustic black hole structure is h0 = 0.5 mm, the power exponent is m = 2, the thickness of the elastic element 120 is h = 5 mm, and the number of layers of acoustic black holes 1200 distributed along different circumferential radii on the two end faces of the elastic element 120 is 3. The cone radii of the acoustic black holes 1200 distributed in the inner and outer radial directions on one end plane of the elastic element 120 are r = 40 mm, 20 mm, and 10 mm, respectively, decreasing step by step. The cone radii of the acoustic black holes 1200 distributed in the inner and outer radial directions on the other end plane of the elastic element 120 are r = 10 mm, 20 mm, and 40 mm, respectively, increasing step by step. The attenuation law of the acoustic black holes 1200 is based on the formula h(x) = εx. m +h0、 and This results in a different characteristic frequency f of the acoustic black hole 1200, thus giving the acoustic black hole 1200 a broadband vibration absorption effect.

[0072] Example 2:

[0073] The acoustic black hole elastic coupling of the present invention has its vibration reduction effectiveness verified through simulation. In this embodiment, the elastic element assembly 12 has two sets of elastic elements. Within each elastic element set, there are three 4mm thick elastic elements 120 and three 6mm thick elastic elements 120. The number of layers of acoustic black holes 1200 distributed along different circumferential directions on the end face of the elastic element 120 is three, and the number of acoustic black holes 1200 distributed along the same circumferential direction on the elastic element 120 is eight. A simulation model was built based on the above specific data, and the vibration level drop curve of the acoustic black hole coupling of the present invention was obtained based on the simulation results.

[0074] The existing diaphragm coupling structure is as follows: the diaphragm in the diaphragm assembly is a thin annular plate of uniform thickness, with a thickness of 5mm, and the isolation gasket is 1mm thick. Figure 9 As shown, the simulation of the vibration level drop of the acoustic black hole coupling in this embodiment is compared with the simulation of the vibration level drop of the coupling in the prior art. In the frequency range of 10-2000Hz, the vibration level drop of the coupling in the prior art is 14dB, while the vibration level drop of the acoustic black hole coupling of the present invention is 25.4dB, and the vibration reduction effect is significantly enhanced.

[0075] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics of the solutions is not described in detail here. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An acoustic black hole elastic coupling, characterized in that, It includes a vibration damping component (1) and an intermediate shaft (2), one end of the vibration damping component (1) is connected to the intermediate shaft (2), and the other end is connected to a drive shaft. The vibration damping component (1) has multiple sets of elastic element groups of different thicknesses, and the multiple sets of elastic element groups are arranged side by side. The elastic element group includes multiple elastic elements and washers for spaced installation of adjacent elastic elements. The elastic element is a disc structure with a central hole. Each set of washers includes an inner washer and an outer washer. Each inner washer is installed on the outer edge of the central hole of an elastic element, and each outer washer is installed on the inner side of the outer edge of an elastic element. Each set of outer washer, inner washer, and two adjacent elastic elements forms a closed cavity; Both end faces of the elastic element are covered with damping structures. The two end faces of the elastic element are arranged in an alternating array of multiple conical acoustic black holes from the center outward along different circumferential radii; the diameter of the conical surface of the acoustic black holes distributed in the inner radial and outer radial directions on one end plane of the elastic element increases progressively, while the diameter of the conical surface of the acoustic black holes distributed in the inner radial and outer radial directions on the other end plane of the elastic element decreases progressively; the damping structure is laid inside the acoustic black holes. The damping structure includes a viscous material and damping particles; the viscous material is laid on the conical concave surface of the acoustic black hole, the structure of the damping particles matches the structure of the acoustic black hole, and the damping particles are fixed inside the acoustic black hole by the viscous material. The vibration damping assembly (1) includes an elastic element assembly (12), two elastic element assemblies (12) are arranged side by side, and the edges of the two elastic element assemblies (12) are connected in series by fasteners. The contact surfaces of the elastic element and the washer, as well as the fasteners, are covered with an insulator.

2. The acoustic black hole elastic coupling according to claim 1, characterized in that, The elastic element group includes at least two groups with different thicknesses. The elastic element, the washer and the cavity in each group have the same thickness and gradually increase in thickness toward the intermediate axis (2).

3. The acoustic black hole elastic coupling according to claim 1, characterized in that, The vibration damping component (1) has two identical components, and the two vibration damping components (1) are symmetrically installed on the left and right sides of the intermediate shaft (2); The vibration damping assembly (1) also includes a first flange (13) and a second flange (14). The overall structure of the elastic element assembly (12) is ring-shaped and has two identical structures. The first flange (13) and the second flange (14) are arranged coaxially from the end of the intermediate shaft (2) outward. One end of the first flange (13) is fixedly installed to the end of the intermediate shaft (2), and the other end is coaxially connected to one of the elastic element assemblies (12); one end of the second flange (14) is coaxially connected to the other elastic element assembly (12), and the other end is externally connected to a drive shaft.

4. The acoustic black hole elastic coupling according to claim 3, characterized in that, The elastic element assembly (12) consists of multiple sets of elastic elements of different thicknesses.

5. The acoustic black hole elastic coupling according to claim 1, characterized in that, The damping particles are made of rubber.

6. The acoustic black hole elastic coupling according to claim 1, characterized in that, The number of acoustic black holes distributed along the same circumferential direction on the elastic element is 6-10, and the number of layers of acoustic black holes distributed along different circumferential radii on the elastic element is 2-4.

7. The acoustic black hole elastic coupling according to claim 1, characterized in that, The thickness of the washer is 1 / 2 of the thickness of the adjacent elastic element; The elastic element is made of spring steel, and the washer is made of copper.

8. The acoustic black hole elastic coupling according to claim 1, characterized in that, The surface of the insulator is made of epoxy resin, and the internal material of the insulator is made of fiberglass geogrid.

9. The acoustic black hole elastic coupling according to claim 1, characterized in that, The cross-section of the acoustic black hole satisfies The attenuation law is given by the formula, where h(x) is the thickness of the acoustic black hole structure at point x. The cutoff thickness of the acoustic black hole structure. It is a positive rational number with a power exponent m ≥ 2 and a range of 0.4-0.8 mm. constant The calculation formula is In the formula, h is the thickness of the elastic element and r is the radius of the acoustic black hole; The formula for calculating the radius r of an acoustic black hole is: In the formula For elastic modulus, For density, Let f be the Poisson's ratio and f be the characteristic frequency.

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