Vibration isolator with PVC spring coupled with acoustic black hole

Abstract

The invention relates to a PVC spring coupled acoustic black hole vibration isolator, and relates to the technical field of vibration reduction and noise reduction, the PVC spring coupled acoustic black hole vibration isolator comprises a vibration reduction assembly, one end of the vibration reduction assembly is connected with a first controlled structure, and the other end of the vibration reduction assembly is connected with a second controlled structure; the vibration reduction assembly comprises a vibration reduction disc and an electroactive material spring; the vibration reduction disc comprises a connecting column and an acoustic black hole part arranged on the outer side face of the connecting column in a wrapping mode, and the thickness of the acoustic black hole part is gradually decreased in the direction away from the connecting column. At least two vibration reduction discs are arranged along a connecting line of the first controlled structure and the second controlled structure, any two adjacent vibration reduction discs are connected through an electroactive material spring, the rigidity of the electroactive material spring is adjustable, when the rigidity of the electroactive material spring is changed, the modal frequency of the vibration reduction assembly can be changed, movement of a resonance band gap is achieved, and the vibration reduction effect is improved. Therefore, the vibration isolation band gap can be widened, and the vibration isolation effect of the vibration isolator is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction and noise reduction, and particularly relates to a vibration isolator with a PVC spring coupled with an acoustic black hole. Background Art

[0002] Vibration control is a key issue in the fields of machinery, aerospace, automobiles, etc. Especially in precision instruments, high-end manufacturing, and transportation vehicles, vibration will seriously affect the performance and service life. As the main vibration reduction device, the performance of the vibration isolator directly affects the vibration control effect.

[0003] In recent years, through the periodic research on the structure of the acoustic black hole, it has been found that the acoustic black hole can open multiple local resonance band gaps in the full frequency range due to its high modal density and high damping, and has excellent vibration reduction performance. However, the band gap of the acoustic black hole is usually narrow, especially in the low-frequency range, which limits its vibration suppression ability in the vibration environment.

[0004] To solve the above problems, the present invention deeply integrates the intelligent material spring with the acoustic black hole, and proposes a solution that can broaden the working frequency band of the vibration isolator, specifically a vibration isolator with a PVC spring coupled with an acoustic black hole. Summary of the Invention

[0005] To solve the above problems, the present invention provides a vibration isolator with a PVC spring coupled with an acoustic black hole. By setting an electroactive material spring with adjustable stiffness between the vibration reduction components, the modal frequency of the vibration reduction components can be changed, the movement of the band gap can be realized, and finally the technical effect of broadening the vibration isolation frequency band can be achieved.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A vibration isolator with a PVC spring coupled with an acoustic black hole, comprising:

[0008] Vibration reduction components, one end of the vibration reduction components is connected to the first controlled structure, and the other end of the vibration reduction components is connected to the second controlled structure;

[0009] The vibration reduction components include vibration reduction discs and electroactive material springs;

[0010] The vibration reduction disc includes a connecting column and an acoustic black hole part wrapped around the outer side of the connecting column, and the thickness of the acoustic black hole part decreases along the direction away from the connecting column;

[0011] Along the connection line between the first controlled structure and the second controlled structure, at least two vibration reduction discs are provided, and any two adjacent vibration reduction discs are connected by the electroactive material spring, and the stiffness of the electroactive material spring is adjustable.

[0012] Preferably, the electroactive material spring is a PVC spring, and the PVC spring includes a polyvinyl chloride gel electrically connected to an external power source, and the stiffness of the polyvinyl chloride gel can increase with the increase of voltage.

[0013] Preferably, the PVC spring further includes a copper foil electrode and a metal mesh electrode, the polyvinyl chloride gel is disposed between the copper foil electrode and the metal mesh electrode, the copper foil electrode is connected to the cathode of the external power source, and the metal mesh electrode is connected to the anode of the external power source.

[0014] Preferably, it further includes an upper cover, a lower cover and a load-bearing spring; both the damping assembly and the load-bearing spring are installed between the upper cover and the lower cover, and the load-bearing spring is in a compressed state; the damping assembly is connected to the first controlled structure through the upper cover, and the damping assembly is connected to the second controlled structure through the lower cover.

[0015] Preferably, it further includes a linear spring, the damping assembly is connected to the upper cover and / or the lower cover through the linear spring, the linear spring is in a compressed state, and the stiffness of the linear spring is less than that of the load-bearing spring.

[0016] Preferably, the cross-section of the acoustic black hole part is in an annular rectangular structure, the acoustic black hole part includes a first annular rectangular surface, and the intersection point of the diagonals of the first annular rectangular surface is spaced from the center line of the connecting column.

[0017] Preferably, the first annular rectangular surface includes four inner edges and four outer edges, and the thickness of the acoustic black hole part decreases exponentially in the direction away from the connecting column, and the expression of the exponent is:

[0018] where h(w i ) represents the thickness of the acoustic black hole part, w i , i = 1, 2, 3, 4 represents the distance between the inner edge and the outer edge along the direction perpendicular to any one of the inner edges and away from the connecting column, a represents a coefficient, and m is greater than or equal to 2.

[0019] Preferably, an extension part is provided at the circumferential edge of the acoustic black hole part, the cross-section of the extension part is in an annular rectangular structure, and a damping material is provided on the extension part.

[0020] Preferably, the cross-section of the damping material is in an annular rectangular structure, and the cross-section of the damping material is the same size as that of the extension part.

[0021] Preferably, the thickness of the extension part is equal to the minimum thickness of the acoustic black hole part.

[0022] The present invention has achieved the following technical effects compared with the prior art:

[0023] In the vibration isolator with a PVC spring-coupled acoustic black hole disclosed by the present invention, the vibration damping component includes a connecting column and an acoustic black hole part. The acoustic black hole part is wrapped around the outer side surface of the connecting column, and the thickness of the acoustic black hole part gradually decreases along the direction away from the connecting column. The special design of the acoustic black hole part can achieve efficient dissipation of vibration wave energy. Under the local resonance effect of the vibration damping disc, the vibration damping component can generate multiple local resonance band gaps, and thus can achieve excellent low-frequency vibration isolation effect. At the same time, the spring stiffness of the electroactive material is adjustable. When the spring stiffness of the electroactive material changes, the modal frequency of the vibration damping component can be changed to realize the movement of the resonance band gap, and thus the vibration isolation band gap can be broadened, effectively improving the vibration isolation effect of the vibration isolator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic diagram of an embodiment of the present invention;

[0026] Figure 2 It is a top view schematic diagram of the vibration damping disc in an embodiment of the present invention;

[0027] Figure 3 For Figure 2 It is a schematic diagram of the A-A cross-sectional view;

[0028] Figure 4 For Figure 2 It is a schematic diagram of the B-B cross-sectional view;

[0029] Figure 5 It is a schematic diagram of the propagation of elastic waves in the vibration damping disc structure;

[0030] Figure 6 It is a schematic diagram of the structure of the PVC spring;

[0031] Figure 7 It is a schematic diagram of the transmissibility of the periodic acoustic black hole vibration isolator.

[0032] Among them, 1. Vibration damping disc; 2. Electroactive material spring; 3. Connecting column; 4. Acoustic black hole part; 5. Polyvinyl chloride gel; 6. Copper foil electrode; 7. Metal mesh electrode; 8. Upper cover; 9. Lower cover; 10. Bearing spring; 11. Linear spring; 12. First annular rectangular surface; 13. Extension part; 14. Damping material. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The purpose of the present invention is to provide a vibration isolator with a PVC spring-coupled acoustic black hole. By connecting adjacent damping discs with an electroactive material spring with adjustable stiffness, the movement of the resonance band gap is realized, and then the vibration isolation band gap can be broadened, effectively improving the vibration isolation effect of the vibration isolator.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0036] Reference Figures 1-7 , the vibration isolator with a PVC spring-coupled acoustic black hole disclosed in the embodiments of the present invention includes: a vibration damping component, one end of the vibration damping component is connected to the first controlled structure, and the other end of the vibration damping component is connected to the second controlled structure; the vibration damping component includes a damping disc 1 and an electroactive material spring 2. Among them, the damping disc 1 includes a connecting column 3 and an acoustic black hole part 4. The acoustic black hole part 4 is wrapped around the outer side of the connecting column 3, and the thickness of the acoustic black hole part 4 gradually decreases along the direction away from the connecting column 3; the acoustic black hole part 4 with a thickness gradually decreasing along the direction away from the connecting column 3 has the energy focusing effect of the acoustic black hole, so that the propagation speed of waves in the medium and high frequency bands decreases with the decrease of the thickness, the wavelength decreases, the vibration amplitude of the waves increases, and they gather towards the area with a smaller thickness, and finally the high damping generated by the acoustic black hole realizes the efficient dissipation of energy, achieving the purpose of vibration reduction and noise reduction. Along the connection line of the first controlled structure and the second controlled structure, at least two damping discs 1 are provided, and any two adjacent damping discs 1 are connected by an electroactive material spring 2. The electroactive material spring 2 is connected to an external power supply, and its stiffness can change with the change of the applied voltage; due to the local resonance effect of the damping disc 1, multiple local resonance band gaps can be generated in a wide frequency range, and the damping disc 1 has rich modes. By arranging the damping discs 1 periodically, excellent low-frequency vibration isolation effects can be achieved. Further, by adjusting the stiffness of the electroactive material spring 2, the connection stiffness between adjacent damping discs 1 can be changed, and then the modal frequency of the vibration isolation component can be changed, realizing the movement of the band gap and the broadening of the vibration isolation frequency band, and thus effectively improving the vibration isolation effect of the vibration damper.

[0037] Preferably, both ends of the electroactive material spring 2 are respectively connected to the connecting columns 3 of the damping discs 1 on both sides thereof.

[0038] Furthermore, the electroactive materials include materials such as polyvinyl chloride gel (PVC gel), electrorheological elastic materials, piezoelectric materials, and dielectric elastomers, whose own stiffness can change with the applied voltage.

[0039] Those skilled in the art can understand that the thickness of the acoustic black hole part 4 is the dimension of the acoustic black hole part 4 along the common perpendicular direction of the first controlled structure and the second controlled structure.

[0040] As a preferred embodiment, the electroactive material spring 2 is a PVC spring. The PVC spring includes a polyvinyl chloride gel 5 electrically connected to an external power supply. The stiffness of the polyvinyl chloride gel 5 can increase with the increase of the voltage. During use, by changing the working voltage of the external power supply, the stiffness and damping coefficient of the polyvinyl chloride gel 5 can be changed to achieve the broadening of the vibration isolation frequency band. And the polyvinyl chloride gel 5 can produce large changes in stiffness and damping under small voltage changes, reducing the energy consumption when adjusting the vibration isolation effect of the vibration isolator.

[0041] Furthermore, three damping discs 1 are provided. PVC springs are installed between any two adjacent damping discs 1. Both ends of any one PVC spring are connected to the connecting columns 3 of the damping discs 1 on its two sides.

[0042] As a preferred embodiment, the PVC spring further includes a copper foil electrode 6 and a metal mesh electrode 7. The copper foil electrode 6 is a planar electrode plate. The polyvinyl chloride gel 5 is arranged between the copper foil electrode 6 and the metal mesh electrode 7, and the polyvinyl chloride gel 5 is electrically connected to the copper foil electrode 6 and the metal mesh electrode 7 respectively. The copper foil electrode 6 is connected to the cathode of the external power supply, and the metal mesh electrode 7 is connected to the anode of the external power supply. The external electrical stimulation can make the negatively charged plasticizer molecules inside the polyvinyl chloride gel 5 migrate to the anode side to form a rich solvent layer. Under the action of the Maxwell electrostatic force, the rich solvent layer creeps into the mesh holes of the metal mesh electrode 7, so that the stiffness of the PVC spring can be changed, and at the same time, the friction between the polyvinyl chloride gel 5 and the mesh holes is enhanced, thereby changing the damping characteristics.

[0043] Preferably, the voltage that can be applied to both ends of the PVC spring is usually 0 - 800V.

[0044] As a preferred embodiment, it further includes an upper cover 8, a lower cover 9 and a bearing spring 10; both the damping assembly and the bearing spring 10 are installed between the upper cover 8 and the lower cover 9, and the bearing spring 10 is in a compressed state; the damping assembly is connected to the first controlled structure through the upper cover 8, and the damping assembly is connected to the second controlled structure through the lower cover 9; the bearing spring 10 can provide a supporting force for the upper cover 8 pointing to the first controlled structure and can provide a supporting force for the lower cover 9 pointing to the second controlled structure to avoid the damping assembly being subjected to excessive extrusion force during operation. At the same time, the bearing spring 10 is a flexible structure and can effectively prevent vibration from being directly transmitted between the first controlled structure and the second controlled structure through the bearing spring 10.

[0045] As a preferred embodiment, it further includes a linear spring 11. The damping assembly is connected to the upper cover 8 and / or the lower cover 9 through the linear spring 11. The linear spring 11 is in a compressed state, and the stiffness of the linear spring 11 is less than that of the bearing spring 10. The linear spring 11 can provide a pre-tightening force for the damping assembly, so that the copper foil electrode 6 and the metal mesh electrode 7 can be closely attached to both sides of the polyvinyl chloride gel 5 to prevent the polyvinyl chloride gel 5 from detaching from the copper foil electrode 6 and / or the metal mesh electrode 7. The extrusion force provided by the linear spring 11 will not cause the polar molecules or chain segments inside the polyvinyl chloride gel 5 to rearrange. Therefore, although the thickness of the PVC spring will decrease to some extent at this time, its stiffness will not change. In the free state of the PVC spring, after being energized, the polyvinyl chloride gel 5 deforms, resulting in an increase in the stiffness of the PVC spring and a decrease in its thickness. However, since the linear spring 11 has compressed the thickness of the PVC spring to a certain extent before the stiffness of the polyvinyl chloride gel 5 increases, the PVC spring after being energized will no longer change significantly, ensuring a stable connection relationship between the damping assembly and the controlled structure.

[0046] Preferably, the connecting column 3 is a square column with a rectangular cross-section.

[0047] As a preferred embodiment, the cross-section of the acoustic black hole portion 4 is in an annular rectangular structure. The acoustic black hole portion 4 includes a first annular rectangular surface 12, and the intersection point of the diagonals of the first annular rectangular surface 12 is spaced from the center line of the connecting column 3. Specifically, the upper end surface and the lower end surface of the acoustic black hole portion 4 are parallel to each other. Along the common perpendicular direction of the first controlled structure and the second controlled structure, the projection of the upper end surface of the acoustic black hole portion 4 is a first rectangular ring, and the projection of the lower end surface of the acoustic black hole portion 4 is a second rectangular ring. The connection line between the centers of the first rectangular ring and the second rectangular ring is not perpendicular to the projection plane where the first rectangular ring is located. The perpendicular bisector passing through the center of gravity of the end surface of the acoustic black hole portion 4 for deviating from the first controlled structure and perpendicular to this end surface is parallel to the center line of the connecting column 3 and non-collinear. The acoustic black hole portion 4 is arranged in the above non-centrosymmetric form, which avoids the appearance of symmetric vibration modes in the modal revitalization of the acoustic black hole portion 4. The symmetric modal vibration modes have poor vibration isolation effects and may have modes with very close frequencies, reducing the number of effective modes. Therefore, this eccentric design is adopted to improve the vibration isolation performance.

[0048] As a preferred embodiment, the first annular rectangular surface 12 includes four inner edges and four outer edges. The thickness of the acoustic black hole portion 4 decreases exponentially along the direction away from the connecting column 3, and the expression of the exponent is:

[0049] where h(w i ) represents the thickness of the acoustic black hole portion 4, w i , i = 1, 2, 3, 4 represents the distance between the inner edge and the outer edge along the direction perpendicular to any one of the inner edges and away from the connecting column 3, a represents a coefficient, and m is greater than or equal to 2. The value of a is related to the numerical values of the thinnest end and the thickest end of the acoustic black hole portion 4, and is also related to the vertical distance between the thinnest end and the thickest end. Those skilled in the art can select the value of a according to the vibration frequency of the controlled structure and the actual installation requirements.

[0050] As a preferred embodiment, an extension portion 13 is provided at the circumferential edge of the acoustic black hole portion 4. The cross-section of the extension portion 13 is in an annular rectangular structure, and a damping material 14 is provided on the extension portion 13. By providing the extension portion 13 to install the damping material 14, it is ensured that after the vibration can be fully concentrated in the acoustic black hole portion 4, it is then absorbed by the damping material 14. The damping material 14 can efficiently convert mechanical energy into heat energy and dissipate it under the shear action. By attaching the damping material 14 to the extension portion 13, the overall energy absorption capacity of the shock absorber can be further improved to strengthen the purpose of vibration reduction and noise reduction.

[0051] Preferably, the damping material 14 is provided on the upper end surface and / or the lower end surface of the extension portion 13.

[0052] As a preferred embodiment, the cross-section of the damping material 14 is also in an annular rectangular structure, and the size of the cross-section of the damping material 14 is the same as that of the cross-section of the extension part 13 to ensure that the damping material 14 can effectively absorb the energy in the extension part 13.

[0053] Preferably, the damping material 14 is a butyl rubber material.

[0054] More preferably, the thickness of the extension part 13 is equal to the minimum thickness of the acoustic black hole part 4.

[0055] As a preferred embodiment, the load-bearing spring 10 is made of rubber material or metal spring, and the linear spring 11 is made of stainless steel.

[0056] Preferably, the upper cover 8, the lower cover 9, the vibration damping disc 1 and the extension part 13 are all made of aluminum.

[0057] As a preferred embodiment, the outer edge of the cross-section of the acoustic black hole part 4 is circular. Correspondingly, the cross-sections of the extension part 13 and the damping material 14 are both in an annular shape.

[0058] Preferably, the acoustic black hole part 4 is wrapped and arranged on the outer side of the connecting column 3. The connecting column 3 is arranged at the central position of the acoustic black hole part, that is, the center line of the connecting column 3 coincides with the center line of the acoustic black hole part 4. At this time, the cross-section of the acoustic black hole part 4 is in an annular shape.

[0059] Preferably, the connecting column 3 is eccentrically arranged at a position spaced from the center line of the acoustic black hole part 4.

[0060] Furthermore, the connecting column 3 is a cylindrical structure with a circular cross-section.

[0061] As a preferred embodiment, under the condition that the thickness decreases along the direction away from the connecting column, the acoustic black hole part 4 can also be a structure with a cross-section outer edge in the shape of an ellipse, a regular polygon, an irregular polygon, etc.

[0062] As a preferred embodiment, the vibration isolator of the PVC spring-coupled acoustic black hole includes a load-bearing shell. The vibration damping assembly is installed in the load-bearing cavity inside the load-bearing shell. The upper cover 8, the lower cover 9 and the load-bearing spring 10 are all part of the load-bearing shell, and the upper cover 8, the lower cover 9 and the load-bearing spring 10 are all detachably arranged.

[0063] As a preferred embodiment, three vibration damping discs 1 and two PVC springs are adopted; the upper cover 8 and the lower cover 9 are uniform plate structures with a length of 300 mm, a width of 225 mm and a height of 5 mm. Four load-bearing springs 10 are arranged. The four load-bearing springs 10 are respectively connected to the four corners of the upper cover 8 and the lower cover 9. The four inner edges and four outer edges of the first rectangular ring surface form a third rectangular ring. The widths of the four sides of the third rectangular ring in the clockwise direction in the top view are wABH1 , w ABH2 , w ABH3 , w ABH4 , where w ABH1 = 119.5 mm, w ABH2 = 80.25 mm, w ABH3 = 82.5 mm, w ABH4 = 50.75 mm. The initial stiffness of the PVC spring is set to 500 N / m, and the initial damping coefficient is set to 0.1 N / (m / s). The stiffness and damping of the PVC spring increase with the increase of voltage. The upper side and the lower side of the vibration damping component are respectively connected to the first controlled structure and the second controlled structure through the linear spring 11, and the stiffness of the linear spring 11 is 10 N / m. By substituting the stiffness and damping parameters of the PVC spring corresponding to 400 V and 600 V voltages into the finite element model calculation, the vibration isolator is verified to have a tuning effect.

[0064] As a preferred embodiment, in order to evaluate the vibration isolation level of the vibration isolator, the center of the upper cover 8 is selected as the excitation source. After the COMSOL calculation is completed, the displacements at the center of the upper cover 8 and the center point of the lower cover 9 are respectively extracted, and their transmissibility is calculated. The transmissibility calculation formula is where w is the displacement in its thickness direction. And the finite element method is used to establish a model in COMSOL, and the damping level and vibration response of the structure are calculated through steady-state dynamic analysis and modal superposition method.

[0065] As a preferred embodiment, the vibration isolator with a PVC spring coupled with an acoustic black hole provided by the present invention can achieve excellent vibration isolation performance below -20 dB in multiple frequency bands. This means that when vibration is transmitted to the controlled structure through the vibration isolator, the energy is effectively attenuated, and the transmissibility can be lower than -20 dB, indicating that the amplitude of the vibration is less than one-tenth of the original when it is transmitted to the controlled structure through the vibration isolator. Thanks to the synergistic effect of various vibration isolation mechanisms, the present invention can efficiently isolate the transmission of vibration in a wide frequency range. In addition, by substituting the stiffness and damping of the PVC spring under different voltages, the transmission curve can move towards higher frequencies with the increase of voltage. This is because the increase of voltage causes the increase of the stiffness of the PVC spring, which in turn changes the modal frequency of the vibration damping component, thereby changing the range of the band gap and broadening the working frequency band of the vibration isolator, improving the vibration isolation effect.

[0066] The specific vibration isolation mechanism includes the following aspects: First, the upper cover 8 and the lower cover 9 are elastically connected to the first controlled structure and the second controlled structure, so that part of the elastic waves are reflected due to impedance mismatch during the transmission of elastic waves in the medium and high frequency bands; Second, the thickness of the acoustic black hole part 4 in the vibration isolation component decreases exponentially, with the energy focusing effect of the acoustic black hole, so that the propagation speed of the waves in the medium and high frequency bands decreases with the decrease of the thickness, the wavelength decreases, the vibration amplitude of the waves increases, and they gather towards the area with smaller thickness, and finally the high damping generated by the acoustic black hole achieves efficient energy dissipation; Third, due to the rich modes of the acoustic black hole part 4, by arranging the damping discs 1 periodically, multiple local resonance band gaps can be generated in a wide frequency range due to the local resonance effect of the damping discs 1, especially having excellent effects on low-frequency vibration isolation; Fourth, the PVC springs connecting the damping discs 1, due to their own high damping and variable stiffness-damping characteristics, can not only dissipate the energy of the waves during the wave transmission process, but also change their own stiffness through the regulation of the external electric field, thereby changing the modal frequency of the vibration isolation component, realizing the movement of the band gap, and finally realizing the broadening of the vibration isolation frequency band and improving the vibration isolation effect. In addition, since the vibration isolation component is arranged in the bearing cavity of the bearing shell, the bearing shell can not only protect the vibration isolation component from external interference and damage, which may affect the vibration isolation effect of the vibration isolation component, but also provide a certain bearing capacity.

[0067] Adaptations made according to actual requirements are all within the protection scope of the present invention.

[0068] It should be noted that for those skilled in the art, obviously the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A PVC spring coupled acoustic black hole vibration isolator, characterized in that: include: A vibration reduction component, one end of which is connected to the first controlled structure, and the other end of which is connected to the second controlled structure; The vibration reduction assembly comprises a vibration reduction disk (1) and an electroactive material spring (2); The vibration damping disk (1) comprises a connecting column (3) and an acoustic black hole portion (4) wrapped around the outer side of the connecting column (3), wherein the thickness of the acoustic black hole portion (4) decreases in a direction away from the connecting column (3); At least two vibration damping discs (1) are provided along a line connecting the first controlled structure and the second controlled structure, and any two adjacent vibration damping discs (1) are connected via the electroactive material spring (2), and the stiffness of the electroactive material spring (2) is adjustable.

2. The PVC spring coupled acoustic black hole vibration isolator according to claim 1, characterized in that: The electroactive material spring (2) is a PVC spring, which comprises a polyvinyl chloride gel (5) electrically connected to an external power source, and the stiffness of the polyvinyl chloride gel (5) can increase with the increase of voltage.

3. The PVC spring coupled acoustic black hole isolator according to claim 2, characterized in that: The PVC spring further comprises a copper foil electrode (6) and a metal mesh electrode (7), the polyvinyl chloride gel (5) being arranged between the copper foil electrode (6) and the metal mesh electrode (7), the copper foil electrode (6) being connected to the cathode of an external power source, and the metal mesh electrode (7) being connected to the anode of the external power source.

4. The PVC spring coupled acoustic black hole isolator according to claim 1, characterized in that: It also includes an upper cover (8), a lower cover (9) and a load-bearing spring (10); the vibration reduction assembly and the load-bearing spring (10) are both installed between the upper cover (8) and the lower cover (9), and the load-bearing spring (10) is in a compressed state; The vibration reduction component is connected to the first controlled structure via the upper cover (8), and the vibration reduction component is connected to the second controlled structure via the lower cover (9).

5. The PVC spring coupled acoustic black hole vibration isolator according to claim 4, characterized in that: It also includes a linear spring (11), the vibration reduction assembly is connected to the upper cover (8) and / or the lower cover (9) via the linear spring (11), the linear spring (11) is in a compressed state, and the stiffness of the linear spring (11) is less than the stiffness of the load-bearing spring (10).

6. The PVC spring coupled acoustic black hole vibration isolator according to claim 1, characterized in that: The cross section of the acoustic black hole portion (4) is an annular rectangular structure, and the acoustic black hole portion (4) comprises a first annular rectangular surface (12), wherein the intersection of the diagonals of the first annular rectangular surface (12) is spaced apart from the center line of the connecting column (3).

7. The PVC spring coupled acoustic black hole vibration isolator according to claim 6, characterized in that: The first annular rectangular surface (12) comprises four inner edges and four outer edges, and the thickness of the acoustic black hole portion (4) decreases exponentially in a direction away from the connecting column (3), and the expression of the exponent is: h(w i ) = aw i m ,i=1,2,3,4, where h(w i ) represents the thickness of the acoustic black hole portion (4), w i , i=1,2,3,4 represents the distance between the inner edge and the outer edge in a direction perpendicular to any one of the inner edges away from the connecting column (3), a represents a coefficient, and m is greater than or equal to 2.

8. The PVC spring coupled acoustic black hole isolator according to claim 6, characterized in that: An extension portion (13) is provided on the annular edge of the acoustic black hole portion (4); the cross section of the extension portion (13) is an annular rectangular structure; and a damping material (14) is provided on the extension portion (13).

9. The PVC spring coupled acoustic black hole vibration isolator according to claim 8, characterized in that: The cross section of the damping material (14) is an annular rectangular structure, and the cross section of the damping material (14) is the same size as the cross section of the extension portion (13).

10. The PVC spring coupled acoustic black hole vibration isolator according to claim 8, characterized in that: The thickness of the extension portion (13) is equal to the minimum thickness of the acoustic black hole portion (4).

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