A vibration isolator for PVC spring-coupled acoustic black holes

Abstract

This invention relates to a vibration isolator with a PVC spring-coupled acoustic black hole, belonging to the field of vibration reduction and noise reduction technology. It includes: a vibration damping component, one end of which is connected to a first controlled structure, and the other end of which is connected to a second controlled structure; the vibration damping component includes a damping disc and an electroactive material spring; the damping disc includes a connecting column and an acoustic black hole portion wrapped around the outer side of the connecting column, the thickness of which decreases in the direction away from the connecting column; at least two damping discs are provided along the line connecting the first and second controlled structures, and any two adjacent damping discs are connected by an electroactive material spring. The stiffness of the electroactive material spring is adjustable; when the stiffness of the electroactive material spring changes, it can change the modal frequency of the vibration damping component, realizing the movement of the resonant bandgap, thereby widening the vibration isolation bandgap and effectively improving the vibration isolation effect of the isolator.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and noise reduction technology, specifically to a vibration isolator for a PVC spring-coupled acoustic black hole. Background Technology

[0002] Vibration control is a critical issue in fields such as machinery, aerospace, and automotive. Vibration can severely impact performance and lifespan, especially in precision instruments, high-end manufacturing, and transportation vehicles. Vibration isolators, as primary vibration damping devices, directly affect the effectiveness of vibration control.

[0003] In recent years, periodic studies of acoustic black hole structures have revealed that acoustic black holes, due to their high modal density and high damping, can open multiple local resonant band gaps across the entire frequency range, exhibiting excellent vibration reduction performance. However, the band gaps of acoustic black holes are typically narrow, especially in the low-frequency range, which limits their vibration suppression capabilities in vibrating environments.

[0004] To address the aforementioned issues, this invention deeply integrates smart material springs with acoustic black holes, proposing a solution that can broaden the operating frequency band of vibration isolators. Specifically, it is a vibration isolator with PVC springs coupled to acoustic black holes. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a vibration isolator with PVC spring-coupled acoustic black holes. By setting an electroactive material spring with adjustable stiffness between the vibration damping components, the modal frequency of the vibration damping components can be changed, thereby shifting the bandgap and ultimately achieving the technical effect of widening the vibration isolation frequency band.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A vibration isolator for a PVC spring-coupled acoustic black hole includes:

[0008] A vibration damping component, one end of which is connected to a first controlled structure, and the other end of which is connected to a second controlled structure;

[0009] The vibration damping assembly includes a vibration damping disc and an electrically active material spring;

[0010] The damping disc includes a connecting column and an acoustic black hole portion wrapped around the outer side of the connecting column, the thickness of which decreases in the direction away from the connecting column;

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

[0012] Preferably, the electroactive material spring is a PVC spring, the PVC spring comprising polyvinyl chloride gel electrically connected to an external power source, and the stiffness of the polyvinyl chloride gel can increase with increasing 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 supply, and the metal mesh electrode is connected to the anode of the external power supply.

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

[0015] Preferably, it also includes a linear spring, and the vibration 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 the stiffness of the load-bearing spring.

[0016] Preferably, the cross-section of the acoustic black hole portion has an annular rectangular structure, and the acoustic black hole portion includes a first annular rectangular surface, wherein the intersection of the diagonals of the first annular rectangular surface is spaced apart 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 portion decreases exponentially along the direction away from the connecting post, wherein the expression for the exponent is:

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

[0019] Preferably, the circumferential edge of the acoustic black hole portion is provided with an extension portion, the cross-section of the extension portion is a ring-shaped rectangular structure, and a damping material is provided on the extension portion.

[0020] Preferably, the damping material has a cross-section with an annular rectangular structure, and the cross-section of the damping material has the same dimensions as the cross-section of the extension.

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

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] In the PVC spring-coupled acoustic black hole vibration isolator disclosed in this invention, the vibration damping component includes a connecting column and an acoustic black hole portion. The acoustic black hole portion is wrapped around the outer surface of the connecting column, and the thickness of the acoustic black hole portion gradually decreases in the direction away from the connecting column. The special design of the acoustic black hole portion can achieve efficient dissipation of vibration wave energy. Under the local resonance effect of the damping disc, the vibration damping component can generate multiple local resonance band gaps, thereby achieving excellent low-frequency vibration isolation effect. At the same time, the stiffness of the electroactive material spring is adjustable. When the stiffness of the electroactive material spring changes, the modal frequency of the vibration damping component can be changed, realizing the movement of the resonance band gap, thereby widening the vibration isolation band gap and effectively improving the vibration isolation effect of the vibration isolator. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of one embodiment of the present invention;

[0026] Figure 2 This is a top view of the vibration damping disc in one embodiment of the present invention;

[0027] Figure 3 for Figure 2 A schematic diagram of the AA-direction section;

[0028] Figure 4 for Figure 2 A schematic diagram of the BB-directed cross-section;

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

[0030] Figure 6 This is a structural diagram of a PVC spring;

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

[0032] Among them, 1. 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. load-bearing spring; 11. linear spring; 12. first annular rectangular surface; 13. extension part; 14. damping material. Detailed Implementation

[0033] 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.

[0034] The purpose of this invention is to provide a vibration isolator that couples an acoustic black hole with a PVC spring. By connecting adjacent damping discs with an electroactive material spring of adjustable stiffness, the resonant bandgap can be moved, thereby widening the vibration isolation bandgap and effectively improving the vibration isolation effect of the vibration isolator.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] refer to Figure 1-7 The vibration isolator with PVC spring-coupled acoustic black hole disclosed in this embodiment of the invention includes: a vibration damping component, one end of which is connected to a first controlled structure, and the other end of which is connected to a second controlled structure; the vibration damping component includes a damping disk 1 and an electroactive material spring 2, wherein the damping disk 1 includes a connecting post 3 and an acoustic black hole part 4, the acoustic black hole part 4 is wrapped around the outer side of the connecting post 3, and the thickness of the acoustic black hole part 4 gradually decreases in the direction away from the connecting post 3; the acoustic black hole part 4, whose thickness gradually decreases in the direction away from the connecting post 3, has the energy focusing effect of an acoustic black hole, so that the propagation speed of the mid-to-high frequency band wave decreases as the thickness decreases, the wavelength decreases, the vibration amplitude of the wave increases, and the wave gathers in the region with less thickness, and finally the high damping generated by the acoustic black hole achieves efficient energy dissipation, thereby achieving the purpose of vibration reduction and noise reduction. At least two damping discs 1 are provided along the line connecting the first and second controlled structures. 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 applied voltage. Due to the local resonance effect of the damping discs 1, multiple local resonant band gaps can be generated in a wide frequency range, and the damping discs 1 have rich modes. By periodically arranging the damping discs 1, excellent low-frequency vibration isolation effect can be achieved. Furthermore, by adjusting the stiffness of the electroactive material spring 2, the connection stiffness between adjacent damping discs 1 can be changed, thereby changing the modal frequency of the vibration isolation component, realizing band gap movement, widening the vibration isolation frequency band, and thus effectively improving the vibration isolation effect of the damper.

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

[0038] Furthermore, electroactive materials include: polyvinyl chloride gel 5, electrorheological elastic materials, piezoelectric materials, dielectric elastomers, and other materials whose stiffness can change with the applied voltage.

[0039] As will be understood by those skilled in the art, the thickness of the acoustic black hole section 4 is the dimension of the acoustic black hole section 4 along the common perpendicular direction of the first controlled structure and the second controlled structure.

[0040] In a preferred embodiment, the electroactive material spring 2 is a PVC spring, which includes a polyvinyl chloride gel 5 electrically connected to an external power source. The stiffness of the polyvinyl chloride gel 5 increases with increasing voltage. In use, by changing the operating voltage of the external power source, the stiffness and damping coefficient of the polyvinyl chloride gel 5 can be altered to broaden the vibration isolation frequency band. Furthermore, the polyvinyl chloride gel 5 can produce large stiffness and damping changes with relatively small voltage variations, reducing energy consumption when adjusting the vibration isolation effect of the vibration isolator.

[0041] Furthermore, there are three damping discs 1, and a PVC spring is installed between any two adjacent damping discs 1. Both ends of any PVC spring are connected to the connecting posts 3 of the damping discs 1 on both sides.

[0042] In 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. Polyvinyl chloride gel 5 is disposed between the copper foil electrode 6 and the metal mesh electrode 7, and the polyvinyl chloride gel 5 is electrically connected to both the copper foil electrode 6 and the metal mesh electrode 7. The copper foil electrode 6 is connected to the cathode of an external power supply, and the metal mesh electrode 7 is connected to the anode of the external power supply. External electrical stimulation causes negatively charged plasticizer molecules inside the polyvinyl chloride gel 5 to migrate to the anode side to form a solvent-rich layer. Under the action of Maxwell electrostatic force, the solvent-rich layer creeps into the mesh of the metal mesh electrode 7, thereby changing the stiffness of the PVC spring and increasing the friction between the polyvinyl chloride gel 5 and the mesh, thus changing the damping characteristics.

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

[0044] In a preferred embodiment, the device further includes an upper cover 8, a lower cover 9, and a support spring 10. Both the vibration damping assembly and the support spring 10 are installed between the upper cover 8 and the lower cover 9, with the support spring 10 in a compressed state. The vibration damping assembly is connected to the first controlled structure via the upper cover 8, and to the second controlled structure via the lower cover 9. The support spring 10 provides a supporting force to the upper cover 8 pointing towards the first controlled structure and to the lower cover 9 pointing towards the second controlled structure, thus preventing the vibration damping assembly from being subjected to excessive compressive force during operation. Simultaneously, the support spring 10 is a flexible structure that effectively prevents vibration from being directly transmitted between the first and second controlled structures via the support spring 10.

[0045] In a preferred embodiment, a linear spring 11 is also included. The vibration damping 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 its stiffness is less than that of the supporting spring 10. The linear spring 11 provides a preload to the vibration damping assembly, ensuring that the copper foil electrode 6 and the metal mesh electrode 7 are tightly adhered to both sides of the polyvinyl chloride gel 5, preventing the polyvinyl chloride gel 5 from detaching from the copper foil electrode 6 and / or the metal mesh electrode 7. The compressive force provided by the linear spring 11 does 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, its stiffness will not change. In the free state of the PVC spring, the polyvinyl chloride gel 5 deforms after energization, causing the stiffness of the PVC spring to increase while its thickness decreases. However, since the linear spring 11 has already compressed the thickness of the PVC spring to a certain extent before the stiffness of the polyvinyl chloride gel 5 increases, the PVC spring will not change significantly after energization, ensuring a stable connection between the vibration damping assembly and the controlled structure.

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

[0047] In a preferred embodiment, the acoustic black hole section 4 has a cross-section with an annular rectangular structure. The acoustic black hole section 4 includes a first annular rectangular surface 12, with the intersection of the diagonals of the first annular rectangular surface 12 spaced apart from the centerline of the connecting column 3. Specifically, the upper and lower end surfaces of the acoustic black hole section 4 are parallel. Along the common perpendicular line of the first and second controlled structures, the projection of the upper end surface of the acoustic black hole section 4 is a first rectangular ring, and the projection of the lower end surface of the acoustic black hole section 4 is a second rectangular ring. The line connecting the centers of the first and second rectangular rings is not perpendicular to the projection plane of the first rectangular ring. The perpendicular bisector of the acoustic black hole section 4, which is located at the center of gravity of the end surface facing away from the first controlled structure and is perpendicular to that end surface, is parallel to but not collinear with the centerline of the connecting column 3. By setting the acoustic black hole section 4 in the above-mentioned non-centrally symmetrical form, the modal resonance of the acoustic black hole section 4 is prevented from having symmetrical mode shapes. Symmetrical mode shapes have poor vibration isolation effect and may have modes with very similar frequencies, reducing the number of effective modes. Therefore, this eccentric design is adopted to improve vibration isolation performance.

[0048] In one 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 pillar 3, and the expression for the exponent is:

[0049] Among them, h(w) i ) represents the thickness of the acoustic black hole part 4, w i i = 1, 2, 3, 4 represents the distance between the inner and outer edges along any perpendicular inner edge 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 values ​​of the thinnest and thickest ends of the acoustic black hole section 4, and also to the perpendicular distance between the thinnest and thickest ends. 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] In a preferred embodiment, an extension 13 is provided on the circumferential edge of the acoustic black hole section 4. The cross-section of the extension 13 is a ring-shaped rectangular structure, and a damping material 14 is provided on the extension 13. By providing the extension 13 to install the damping material 14, it is ensured that vibrations are fully concentrated in the acoustic black hole section 4 before being absorbed by the damping material 14. Under shear action, the damping material 14 can efficiently convert mechanical energy into heat energy dissipation. By attaching the damping material 14 to the extension 13, the overall energy absorption capacity of the vibration damper can be further improved, thereby enhancing the purpose of vibration reduction and noise reduction.

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

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

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

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

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

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

[0057] In a preferred embodiment, the outer edge of the cross-section of the acoustic black hole section 4 is circular, and correspondingly, the cross-sections of the extension section 13 and the damping material 14 are both annular.

[0058] Preferably, the acoustic black hole section 4 is wrapped around the outer surface of the connecting post 3, and the connecting post 3 is located at the center of the acoustic black hole section, that is, the center line of the connecting post 3 coincides with the center line of the acoustic black hole section 4. At this time, the cross-section of the acoustic black hole section 4 is annular.

[0059] Preferably, the connecting column 3 is eccentrically positioned at a distance from the center line of the acoustic black hole section 4.

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

[0061] As a preferred embodiment, provided that the thickness decreases in the direction away from the connecting column, the acoustic black hole part 4 can also be a structure with an elliptical, regular polygonal, or irregular polygonal shape on the outer edge of the cross-section.

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

[0063] In a preferred embodiment, three damping discs 1 and two PVC springs are used; the upper cover 8 and lower cover 9 are uniform plate structures with a length of 300mm, a width of 225mm, and a height of 5mm. Four load-bearing springs 10 are provided, and 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 form a third rectangular ring, and the widths of the four sides of the third rectangular ring in the clockwise direction along the top view are w.ABH1 w ABH2 w ABH3 w ABH4 , where w ABH1 =119.5mm, w ABH2 =80.25mm, w ABH3 =82.5mm, w ABH4 =50.75mm. The initial stiffness of the PVC spring is set to 500N / m, and the initial damping coefficient is set to 0.1N / (m / s). The stiffness and damping of the PVC spring increase with the increase of voltage. The upper and lower sides of the vibration damping assembly are connected to the first and second controlled structures respectively through linear spring 11. The stiffness of the linear spring 11 is 10N / m. The vibration isolator has a tuning effect by performing finite element model calculations with the stiffness and damping parameters of the PVC spring under 400V and 600V voltages.

[0064] As a preferred implementation, to evaluate the vibration isolation level of the vibration isolator, the center of the upper cover 8 is selected as the excitation source. After COMSOL calculation, the displacements at the center of the upper cover 8 and the center of the lower cover 9 are extracted respectively, and their transmissibility is calculated. The transmissibility calculation formula is as follows: Where w represents the displacement in the thickness direction. A model was established in COMSOL using the finite element method, and the damping level and vibration response of the structure were calculated through steady-state dynamic analysis and modal superposition method.

[0065] As a preferred embodiment, the PVC spring-coupled acoustic black hole vibration isolator provided by this invention achieves excellent vibration isolation performance below -20dB across multiple frequency bands. This means that the energy of vibration is effectively attenuated when transmitted to the controlled structure through the isolator, with a transmission rate below -20dB. This indicates that the amplitude of vibration transmitted to the controlled structure through the isolator is less than one-tenth of its original value. Thanks to the synergistic effect of multiple vibration isolation mechanisms, this invention can efficiently isolate vibration transmission over a wide frequency range. Furthermore, by incorporating the stiffness and damping of the PVC spring under different voltages, the transmission curve shifts towards higher frequencies as the voltage increases. This is because the increase in voltage causes an increase in the stiffness of the PVC spring, which in turn changes the modal frequency of the vibration isolation component, thereby altering the bandgap range, widening the operating frequency band of the isolator, and improving the vibration isolation effect.

[0066] The specific vibration isolation mechanism includes the following aspects: First, the connection between the upper cover 8 and the lower cover 9 and the first and second controlled structures is an elastic connection, causing some of the elastic waves in the mid-to-high frequency band to be reflected due to impedance mismatch during transmission; Second, the thickness of the acoustic black hole section 4 in the vibration isolation component decreases exponentially, possessing the energy focusing effect of an acoustic black hole, causing the propagation speed of the mid-to-high frequency band waves to decrease as the thickness decreases, the wavelength to decrease, and the wave vibration amplitude to increase, concentrating in the region with decreasing thickness, and finally achieving efficient energy dissipation through the high damping generated by the acoustic black hole; Third... Because the acoustic black hole section 4 has rich modes, by periodically arranging the damping discs 1, multiple local resonant band gaps can be generated over a wide frequency range due to the local resonance effect of the damping discs 1, which has an excellent effect, especially on low-frequency vibration isolation. Fourth, the PVC springs connecting the damping discs 1, due to their high damping and variable stiffness-damping characteristics, can not only dissipate energy during wave transmission, but also change their stiffness through the control of an external electric field, thereby changing the modal frequency of the vibration isolation component, realizing band gap shifting, and ultimately widening the vibration isolation frequency band and improving the vibration isolation effect. In addition, since the vibration isolation component is set in the bearing cavity of the bearing shell, the bearing shell not only protects the vibration isolation component from external interference and damage, which would affect the vibration isolation effect, but also provides a certain load-bearing capacity.

[0067] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0068] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the 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 invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A vibration isolator of a PVC spring coupled acoustic black hole, characterized in that, The application relates to a damping assembly for a first controlled structure and a second controlled structure. The damping assembly comprises a damping disc (1) and an electroactive material spring (2). The damping disc (1) comprises a connecting column (3) and an acoustic black hole part (4) arranged outside the connecting column (3), the thickness of the acoustic black hole part (4) decreasing in a direction away from the connecting column (3). Along a line connecting the first controlled structure and the second controlled structure, the damping disc (1) is provided with at least two damping discs (1), and any two adjacent damping discs (1) are connected through the electroactive material spring (2), and the stiffness of the electroactive material spring (2) is adjustable. The electroactive material spring (2) is a PVC spring, the PVC spring comprises a polyvinyl chloride gel (5) electrically connected with an external power supply, and the stiffness of the polyvinyl chloride gel (5) can increase with the increase of voltage. The PVC spring further comprises a copper foil electrode (6) and a metal mesh electrode (7), the polyvinyl chloride gel (5) is arranged between the copper foil electrode (6) and the metal mesh electrode (7), the copper foil electrode (6) is connected with a cathode of the external power supply, and the metal mesh electrode (7) is connected with an anode of the external power supply. The damping assembly and the bearing spring (10) are mounted between the upper cover (8) and the lower cover (9), and the bearing spring (10) is in a compressed state.

2. The vibration isolator of claim 1, wherein, The damping assembly is connected with the first controlled structure through the upper cover (8), and the damping assembly is connected with the second controlled structure through the lower cover (9). The damping assembly is connected with 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 smaller than that of the bearing spring (10).

3. The vibration isolator of claim 2, wherein, The acoustic black hole part (4) has a cross-section in a ring-shaped rectangular structure, the acoustic black hole part (4) comprises a first ring-shaped rectangular surface (12), and the intersection point of the diagonal lines of the first ring-shaped rectangular surface (12) is arranged at a distance from the center line of the connecting column (3).

4. The vibration isolator of claim 1, wherein the PVC spring coupling acoustic black hole is formed by a PVC tube having a length of 0.5 to 2.0 inches, an inner diameter of 0.5 to 2.0 inches, and a wall thickness of 0.01 to 0.1 inches. The first ring-shaped rectangular surface (12) comprises four inner edges and four outer edges, the thickness of the acoustic black hole part (4) decreases in an exponential form in a direction away from the connecting column (3), and the expression of the exponential is:

5. The vibration isolator of claim 4, wherein the PVC spring coupling acoustic black hole is configured to have a mass of 0.5 kg to 2 kg. The acoustic black hole part (4) is provided with an extension part (13) on a ring-shaped edge, the extension part (13) has a cross-section in a ring-shaped rectangular structure, and the extension part (13) is provided with a damping material (14). wherein represents the thickness of the acoustic black hole portion (4), represents the distance of the inner edge from the outer edge in the direction away from the connecting column (3) along the perpendicular to any of the inner edges, a represents a coefficient and m is greater than or equal to 2.

6. The vibration isolator of claim 4, wherein, The damping material (14) has a cross-section in a ring-shaped rectangular structure, and the cross-section of the damping material (14) has the same size as that of the extension part (13).

7. The vibration isolator of claim 6, wherein the PVC spring coupling acoustic black hole is configured to have a mass of 0.5 kg to 2 kg. The thickness of the extension part (13) is equal to the minimum thickness of the acoustic black hole part (4).

8. The vibration isolator of claim 6, wherein the PVC spring coupling acoustic black hole is characterized by, ​

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