Composite broadband vibration isolator based on periodic acoustic black holes and linear elastic pieces

Abstract

The invention discloses a composite broadband vibration isolator based on periodic acoustic black holes and linear elastic pieces, and relates to the technical field of vibration and noise reduction. The bearing shell is provided with a bearing cavity and connected with a controlled structure. The vibration isolation assembly is arranged in the bearing cavity, the vibration isolation assembly comprises a plurality of acoustic black hole assemblies which are periodically stacked, each acoustic black hole assembly comprises acoustic black hole structures with different wave impedances, elastic columns and first linear elastic pieces, and the acoustic black hole structures are connected with the adjacent acoustic black hole structures through the elastic columns; the circumferential direction of each elastic column is connected with the inner side wall of the bearing cavity through a plurality of first linear elastic pieces; the two acoustic black hole assemblies located at the two ends of the stacking direction are connected with the inner top wall and the inner bottom wall of the bearing cavity through second linear elastic pieces correspondingly. According to the composite broadband vibration isolator based on the periodic acoustic black holes and the linear elastic pieces, a good vibration isolation effect can be achieved in a low-frequency interval, the vibration isolation interval is widened, and the vibration isolation effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration and noise reduction, and particularly to a composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member. Background Art

[0002] Vibration is a standing wave generated by multiple reflections at the boundaries in a structure, and noise is the wave energy radiated from the structural vibration into the air. Therefore, manipulating the wave behavior in the structure is an effective means to achieve vibration and noise reduction of the structure. Currently, the common manipulation of waves is mainly divided into two methods: active and passive. Active methods generally require external energy supply and the design of the system is very cumbersome, so they have not been widely promoted at present. In addition, for passive methods, the most basic form is to attach damping materials, and some viscoelastic materials can effectively absorb vibration energy.

[0003] Vibration isolators are devices used to reduce, control or isolate vibrations, and are widely used in various industries. Their core purpose is to improve the stability of the system, extend the service life of equipment, reduce noise pollution, and enhance the comfort of the working and living environment by reducing or eliminating the transmission of vibrations. Vibration isolator technology has been widely applied in modern industries, transportation, construction, aerospace and other fields. For some major equipment, the vibration isolation system can effectively reduce the impact of vibrations, noises and other factors on the equipment, thereby extending the service life of the equipment. However, traditional rubber vibration isolators are large in volume and prone to aging, are mainly suitable for high-frequency vibrations, and have poor effects on low frequencies, making it difficult to meet the requirements of modern lightweight and technological industrial upgrades.

[0004] The concept of the Acoustic Black Hole (ABH) effect has played an important role in the research on realizing the artificial manipulation of the propagation of flexural waves in elastic media and structures. As a new type of passive control method, the acoustic black hole controls the propagation of waves through the design and optimization of the shape of the structure itself, and has the advantages of simple and flexible implementation and small mass, and has great potential and broad application prospects in thin-walled structures; however, when using only the acoustic black hole structure for vibration isolation, there is a problem of a small vibration isolation frequency range, and the vibration isolation effect is poor in the low-frequency region. Summary of the Invention

[0005] The purpose of the present invention is to provide a composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member to solve the problems existing in the above-mentioned prior art, and to also achieve a good vibration isolation effect in the low-frequency range, broaden the vibration isolation range, and improve the vibration isolation effect.

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

[0007] The present invention provides a composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member, comprising a bearing shell and a vibration isolation assembly; the bearing shell has a bearing cavity, and the top and bottom of the bearing shell are both used to connect to a controlled structure; the vibration isolation assembly is arranged in the bearing cavity, and the vibration isolation assembly comprises a plurality of acoustic black hole assemblies periodically stacked, each of the acoustic black hole assemblies comprises an acoustic black hole structure with different wave impedance, an elastic column and a first linear elastic member, one acoustic black hole structure is connected to an adjacent acoustic black hole structure through the elastic column, a plurality of first linear elastic members are provided, and each elastic column is circumferentially connected to the inner side wall of the bearing cavity through a plurality of the first linear elastic members; the two acoustic black hole assemblies at both ends of the stacking direction are both connected to a second linear elastic member, and the acoustic black hole assembly at one end is connected to the top wall of the bearing cavity through a second linear elastic member, and the acoustic black hole assembly at the other end is connected to the bottom wall of the bearing cavity through another second linear elastic member.

[0008] Preferably, each of the first linear elastic member and the second linear elastic member is configured as a linear spring.

[0009] Preferably, the wave impedance of the second linear elastic member is different from any one of the wave impedance of the acoustic black hole structure included in each of the acoustic black hole components, the wave impedance of the elastic column, and the wave impedance of the first linear elastic member.

[0010] Preferably, the bearing shell includes a top cover, a bottom cover and a side shell, the top cover and the bottom cover are both used to connect with the controlled structure, and the top cover and the bottom cover can be detachably connected to the two ends of the side shell to enclose the bearing cavity.

[0011] Preferably, the material of the top cover, the bottom cover and each of the acoustic black hole structures is set to aluminum, the material of the side shell and each of the elastic columns is set to rubber; the material of each of the first linear elastic parts and the second linear elastic parts is set to steel.

[0012] Preferably, each of the acoustic black hole structures includes an eccentric disk, a first connecting ring and a second connecting ring, the eccentric disk includes a connecting column and a vibration-damping disk arranged around the connecting column, the connecting column is fixedly connected to the corresponding elastic column; the thickness of the longitudinal section of the vibration-damping disk decreases exponentially from the side attached to the connecting column in the direction away from the connecting column; the first connecting ring is fixedly arranged on the circumferential edge of the eccentric disk, and the second connecting ring is fixedly arranged on the side of the first connecting ring away from the elastic column.

[0013] Preferably, the connecting column and the elastic column are both configured as rectangular columns, the vibration-damping disk is configured as a rectangular disk, and the first connecting ring and the second connecting ring are both configured as rectangular rings.

[0014] Preferably, the expression of the thickness decreasing exponent of the longitudinal section of the vibration damping disc is h(w i ) = h1 + aw i n , i = 1, 2, 3, 4, where h(w i ) represents the thickness of the vibration damping disc, w i , i = 1, 2, 3, 4 respectively represent the distances from any point on the four sides of the vibration damping disc to the corresponding parallel sides of the upper surface of the connecting column, h1 represents the thickness of the thin end of the vibration damping disc, a represents a coefficient, and n is greater than or equal to 2.

[0015] Preferably, the thickness of the first connecting ring is the same as the thickness of the outer end of the vibration damping disc.

[0016] Preferably, the second connecting ring is made of a damping material

[0017] The present invention has achieved the following technical effects compared with the prior art:

[0018] For the composite broadband vibration isolator based on periodic acoustic black holes and linear elastic members provided by the present invention, both the top and bottom of the bearing shell are connected to the controlled structure, the bearing shell is installed between two controlled structures, and a plurality of periodically stacked acoustic black hole components are connected to the inner top wall and inner bottom wall of the bearing shell through two second linear elastic members, and the elastic columns of each acoustic black hole component are connected to the inner side wall of the bearing shell through a plurality of first linear elastic members.

[0019] A wave with a certain frequency is emitted from one of the controlled structures, and this wave with a certain frequency can be transmitted to the vibration isolation component through the bearing shell, and then transmitted to the acoustic black hole structure. The acoustic black hole structure exerts an energy aggregation effect. The propagation speed of the wave decreases as the thickness of the acoustic black hole structure decreases, the wavelength decreases, and the vibration amplitude of the wave increases and gathers towards the region with a smaller thickness. Utilizing the acoustic black hole effect, broadband vibration isolation is performed on the controlled structure.

[0020] In addition, the acoustic black hole structure is connected to the elastic column and arranged in a periodic stack, and the wave impedances of the acoustic black hole structure, the elastic column, and the first linear elastic member are different, which can generate the Bragg scattering effect and cause a band gap through the Bragg scattering effect. The wave is dissipated by the periodically arranged acoustic black hole components when passing through the frequency interval of the band gap; that is, the Bragg scattering effect and the local resonance effect of the acoustic black hole itself enable the vibration isolation component to also achieve a good vibration isolation effect at low frequencies, further broadening the vibration isolation interval and improving the vibration isolation effect.

[0021] In addition, since the vibration isolation component is arranged in the bearing cavity of the bearing housing, the bearing housing can not only protect the vibration isolation component, prevent external interference and damage to the vibration isolation component, and thus avoid affecting the vibration isolation effect of the vibration isolation component, but also provide a certain bearing capacity. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the composite broadband vibration isolator based on the periodic acoustic black hole and the linear elastic member provided in the first embodiment;

[0024] Figure 2 Top view schematic diagram of the vibration damping disc provided in the first embodiment;

[0025] Figure 3 For Figure 2 Cross-sectional schematic diagram taken along the line A-A in

[0026] Figure 4 For Figure 2 Cross-sectional schematic diagram taken along the line B-B in

[0027] Figure 5 Propagation schematic diagram of elastic waves on the vibration damping disc provided in the first embodiment;

[0028] Figure 6 Transmissibility schematic diagram of the composite broadband vibration isolator based on the periodic acoustic black hole and the linear elastic member provided in the first embodiment.

[0029] In the figure: 1 - bearing housing; 11 - bearing cavity; 12 - top cover; 13 - bottom cover; 14 - side cylinder; 2 - vibration isolation component; 21 - acoustic black hole component; 211 - acoustic black hole structure; 212 - elastic column; 213 - first linear elastic member; 214 - second linear elastic member; 215 - eccentric disc; 216 - first connecting ring; 217 - second connecting ring; 218 - connecting column; 219 - vibration damping disc. Detailed Embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] The object of the present invention is to provide a composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member, so as to solve the problems existing in the above-mentioned prior art, and also achieve a good vibration isolation effect in the low-frequency range, broaden the vibration isolation range, and improve the vibration isolation effect.

[0032] In order 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 with reference to the accompanying drawings and specific embodiments.

[0033] Embodiment 1

[0034] This embodiment provides a composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member. Please refer to Figure 1 , which includes a bearing shell 1 and a vibration isolation assembly 2; the bearing shell 1 has a bearing cavity 11, and both the top and bottom of the bearing shell 1 are used to be connected to the controlled structure; the vibration isolation assembly 2 is arranged in the bearing cavity 11, and the vibration isolation assembly 2 includes a plurality of acoustic black hole components 21 stacked periodically. Each acoustic black hole component 21 includes an acoustic black hole structure 211 with different wave impedances, an elastic column 212, and a first linear elastic member 213. An acoustic black hole structure 211 is connected to an adjacent acoustic black hole structure 211 through an elastic column 212. A plurality of first linear elastic members 213 are provided, and each elastic column 212 is circumferentially connected to the inner side wall of the bearing cavity 11 through a plurality of first linear elastic members 213; two acoustic black hole components 21 at both ends in the stacking direction are both connected with a second linear elastic member 214, and one end of the acoustic black hole component 21 is connected to the inner top wall of the bearing cavity 11 through a second linear elastic member 214, and the other end of the acoustic black hole component 21 is connected to the inner bottom wall of the bearing cavity 11 through another second linear elastic member 214; wherein, the periodic stacking means that a plurality of acoustic black hole components 21 are stacked periodically between the controlled structures in turn, as Figure 1 shown.

[0035] In an alternative embodiment of this implementation, preferably, each of the first linear elastic members 213 and the second linear elastic members 214 is provided as a linear spring; by setting them as linear springs, the required linear vibration isolation requirements are met.

[0036] In an alternative embodiment of this implementation, preferably, the wave impedance of the second linear elastic member 214 is different from the wave impedances of the acoustic black hole structure 211, the elastic column 212, and the first linear elastic member 213 included in each acoustic black hole component 21. The impedance mismatch is achieved through the different impedances of the above components, causing the Bragg scattering effect and the local resonance effect of the acoustic black hole itself, so that the vibration isolator can achieve good effects under different working conditions.

[0037] In an alternative embodiment of the present invention, preferably, the carrier housing 1 includes a top cover 12, a bottom cover 13, and a side shell 14. The top cover 12 and the bottom cover 13 are both used for connecting to the controlled structure, and the top cover 12 and the bottom cover 13 are respectively detachably connected to both ends of the side shell 14 to form a carrier cavity 11. By setting the connection method to be detachable, it is convenient for assembly and disassembly, such as by bolt connection.

[0038] In an alternative embodiment of the present invention, preferably, the top cover 12, the bottom cover 13, and the materials of each acoustic black hole structure 211 are set to aluminum, and the side shell 14 and the materials of each elastic column 212 are both set to rubber materials; the materials of each first linear elastic member 213 and the second linear elastic member 214 are both set to steel. By setting different materials, the requirement of impedance mismatch is met on the premise of ensuring the service life. Among them, the side shell 14 is set to a rubber material, so that the impedance mismatch between the top cover 12, the bottom cover 13, and the side shell 14 is realized, and thus more energy passes through the vibration isolation component 2.

[0039] One end of the first linear elastic member 213 is respectively detachably connected to the side shell 14 and the elastic column 212, and one end of a second linear elastic member 214 is respectively connected to the top cover 12 and the connecting column 218 of the vibration damping disc 219, and the other second linear elastic member 214 is respectively detachably connected to the bottom cover 13 and the elastic column 212. By setting the connection method to be detachable, it is convenient to replace the linear spring, and it can be adjusted according to different usage scenarios, so as to realize impedance mismatch and make the vibration isolator play a better effect. Specifically, the elastic column 212 and the vibration damping disc 219 and the connecting column 218 can be fixed by gluing or bolts. The two ends of the linear spring are set as hooks, and hook grooves or hook holes can be set at the corresponding positions of the elastic column 212, the side shell 14, the top cover 12, and the bottom cover 13 for hook connection.

[0040] In an alternative embodiment of the present invention, preferably, please refer to Figures 1-4 ., each acoustic black hole structure 211 includes an eccentric disc 215, a first connecting ring 216, and a second connecting ring 217. The eccentric disc 215 includes a connecting column 218 and a vibration damping disc 219 surrounding the circumferential side of the connecting column 218. The connecting column 218 is fixedly connected to the corresponding elastic column 212; the thickness of the longitudinal section of the vibration damping disc 219 decreases exponentially along the direction away from the connecting column 218 from the side attached to the connecting column 218; the first connecting ring 216 is fixedly arranged at the circumferential edge of the eccentric disc 215, and the second connecting ring 217 is fixedly arranged on the side of the first connecting ring 216 facing away from the elastic column 212. Waves with a certain frequency emitted by the excitation source are transmitted to the additional acoustic black hole structure 21. Since the thickness of the vibration damping disc 219 decreases exponentially, the propagation speed of the wave decreases as the thickness decreases, the wavelength decreases, and the vibration amplitude of the wave increases and gathers in the area where the thickness becomes smaller, such as Figure 5As shown, the acoustic black hole effect and the characteristics of dynamic vibration absorption are utilized to reduce broadband vibration and noise of the controlled structure.

[0041] Further preferably, the thickness of the first connecting ring 216 is the same as the thickness of the outer end of the vibration damping disc 219, and the second connecting ring 217 has the same size as the first connecting ring 216. When the wave reaches the truncation of the vibration damping disc 219, due to the presence of the first connecting ring 216, the wave continues to propagate at a small wave speed. The weak part of the structure occurs at the outermost end of the structure and the outer end is more likely to deform, so the acoustic black hole effect is more likely to occur, achieving high-efficiency broadband vibration and noise reduction, as Figure 5 shown; the outer circumferential edge of the second connecting ring 217 is flush with the outer circumferential edge of the first connecting ring 216. The second connecting ring 217 can be made of a damping material such as butyl rubber material, which can consume most of the bending wave energy, thereby achieving the purpose of high-efficiency energy absorption or vibration and noise reduction, and the thickness can be specifically determined according to different materials.

[0042] Specifically, the eccentric disc 215 and the first connecting ring 216 can be integrally formed to improve stability, and the second connecting ring 217 can be bonded to the first connecting ring 216.

[0043] Further preferably, the connecting column 218 and the vibration damping disc 219 are eccentrically arranged to form an eccentric disc 215, that is, the connecting line between the center of the connecting column 218 and the center of the upper surface of the vibration damping disc 219 is not perpendicular to the upper surface of the vibration damping disc 219. The center of the upper surface of the vibration damping disc 219 coincides with the center line of the bearing shell 1. The entire acoustic black hole structure 211 is eccentrically arranged. Designing it in an eccentric form compared to a symmetric structure enables the acoustic black hole structure 211 to more easily and strongly couple with the controlled structure, better transfer the wave energy to the acoustic black hole structure 211 and consume it, giving full play to the advantages of the acoustic black hole energy aggregation effect.

[0044] In an alternative embodiment of the present example, more preferably, both the connecting column 218 and the elastic column 212 are arranged as rectangular columns, the vibration damping disc 219 is arranged as a rectangular disc, both the first connecting ring 216 and the second connecting ring 217 are arranged as rectangular rings, and correspondingly, the bearing shell 1 is arranged as a rectangular shell; further, the expression of the thickness decreasing exponent of the longitudinal section of the vibration damping disc 219 is h(w i ) = h1 + aw i n , i = 1, 2, 3, 4, where h(w i ) represents the thickness of the vibration damping disc 219, w i , i = 1, 2, 3, 4 respectively represent the distance from any point on the four sides of the vibration damping disc 219 to the corresponding parallel side of the upper surface of the connecting column 218, h1 represents the thickness of the thin end of the vibration damping disc 219, a represents a coefficient, n is greater than or equal to 2, and 3 can be taken; as Figure 5As shown, the wave speed of the incident wave is constant in the uniform region; when it enters the variable-thickness region of the black hole, the wave speed of the flexural wave decreases, the wavelength is compressed, and the wave amplitude gradually increases. As the thickness approaches 0, the flexural wave propagates to near the edge of the acoustic black hole structure 211, and the cumulative phase will reach infinity. Theoretically, the flexural wave will not be able to reach the edge of the structure and thus cannot be reflected back from the edge, so that all the wave energy can be concentrated at the tip of the structure, and the acoustic black hole effect is more likely to occur, achieving high-efficiency broadband vibration reduction and noise reduction.

[0045] It should be noted that in the actual application process, the specific structure of the acoustic black hole structure 211 is not limited to the acoustic black hole structure 211 provided in this embodiment, and other types of additional acoustic black hole components can be selected according to actual needs.

[0046] The working principle of the composite broadband vibration isolator based on the periodic acoustic black hole and the linear elastic member provided in this embodiment is as follows: Both the top and bottom of the bearing shell 1 are connected to the controlled structure. The bearing shell 1 is installed between two controlled structures. A plurality of periodically stacked acoustic black hole components 21 are connected to the inner top wall and the inner bottom wall of the bearing shell 1 through two second linear elastic members 214. The elastic columns 212 of each acoustic black hole component 21 are connected to the inner side wall of the bearing shell 1 through a plurality of first linear elastic members 213. A wave with a certain frequency emitted by one of the controlled structures can be transmitted to the vibration isolation component 2 through the bearing shell 1 and then transmitted to the acoustic black hole structure 211. Since the thickness of the vibration damping disc 219 decreases exponentially, the vibration damping disc 219 exerts an energy aggregation effect. The wave propagation speed decreases as the thickness decreases, the wavelength decreases, and the vibration amplitude of the wave increases, gathering towards the region with a smaller thickness. Using the acoustic black hole effect, broadband vibration isolation is performed on the controlled structure; in addition, the acoustic black hole structure 211 is connected to the elastic columns 212 and arranged in a periodically stacked manner, and the wave impedances of the acoustic black hole structure 211, the elastic columns 212, and the first linear elastic members 213 are different, which can generate the Bragg scattering effect and cause a band gap through the Bragg scattering effect. The wave is dissipated by the periodically arranged acoustic black hole components 21 when passing through the frequency interval of the band gap, that is, the Bragg scattering effect and the local resonance effect of the acoustic black hole itself enable the vibration isolation component 2 to also achieve a good vibration isolation effect at low frequencies, further broadening the vibration isolation range and improving the vibration isolation effect; in addition, since the vibration isolation component 2 is arranged in the bearing cavity 11 of the bearing shell 1, the bearing shell 1 can not only protect the vibration isolation component 2 from external interference and damage, which may affect the vibration isolation effect of the vibration isolation component 2, but also the bearing shell 1 can provide a certain bearing capacity.

[0047] The dimensions of each part of the composite broadband vibration isolator based on the periodic acoustic black hole and the linear elastic element provided in this embodiment are determined according to actual requirements. Specifically, the following dimensions can be adopted in this embodiment. The top cover 12 and the bottom cover 13 of the bearing shell are uniform aluminum plate structures with a length of 300 mm, a width of 225 mm, and a height of 5 mm. The thickness of the side cylinder 14 is 5 mm, and the height of the side cylinder 14 is 60 mm. The widths of each part of the vibration damping disc 215 present four lengths along the vertical corresponding rectangular sides, and along the clockwise direction in the top view, they are respectively widths of w ABH1 , 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 height of the connecting column 212 is 5 mm; the thickest part of the vibration damping disc 219 has a thickness of 5 mm, the thinnest part has a thickness of 0.3 mm, and the width of the first connecting ring 216 is 15 mm; there are two second linear elastic elements 214, and linear springs with a wire diameter of 1.5 mm, an outer diameter of 10 mm, and a length of 10 mm are selected for both; there are four first linear elastic elements 213, and linear springs with a wire diameter of 1 mm, an outer diameter of 8 mm, and lengths of 159.5 mm, 120.25 mm, 122.5 mm, and 90.75 mm in sequence along the clockwise direction in the top view are selected; the distance between the vibration isolation assembly 2 and the side cylinder 14 is 25 mm; the top cover 12, the bottom cover 13, the vibration damping disc 219, and the first connecting ring 216 are all made of aluminum. In the aluminum material simulation, the density is 2700 kg / m^3, the Young's modulus is 7e 10 Pa, the Poisson's ratio is 0.346, and the loss factor is 0.001; in the damping material simulation of the second connecting ring 217, the density is 1850 kg / m^3, the Young's modulus is 2e 8 Pa, the Poisson's ratio is 0.45, and the loss factor is 0.3; in the rubber material simulation of the side shell 14 and each elastic column 212, the density is 1300 kg / m^3, the Young's modulus is 1.2e 7 Pa, the Poisson's ratio is 0.49, and the loss factor is 0.055.

[0048] As Figure 6 shown, in order to evaluate the vibration isolation level of the vibration isolator, the center of the top cover 12 is selected as the excitation source. After using COMSOL simulation to calculate, the displacements at the center of the top cover 12 and the center point of the bottom cover 13 are extracted respectively, and their transmissibility is calculated. The transmissibility calculation formula:

[0049]

[0050] where w is the displacement in the thickness direction of the centers of the top cover 12 and the bottom cover 13, that is, the upper and lower covers. Finally, the transmissibility diagram of the vibration isolator is made as Figure 6As shown, a transmission rate less than 0 indicates that the vibration is reduced when passing through the vibration isolator to the other end. A transmission rate of -20 dB means that the vibration transmitted to the other end is only one-tenth of the original. It can be seen from the figure that the transmission rates in the range of 890 - 1800 Hz are all lower than -20 dB, and there are also some frequency bands with transmission rates lower than -20 dB in the low frequency range, which reflects the vibration isolation performance of the periodic acoustic black hole vibration isolator. This is because the damping disc 219 in the present invention has the acoustic black hole effect and the Bragg scattering effect, which dissipate the wave when it propagates to the vibration isolator, thereby reducing the energy transmitted to the other end face.

[0051] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member, characterized in that: Comprising: A bearing shell (1) having a bearing cavity (11), both the top and bottom of the bearing shell (1) being used for connection with a controlled structure; And A vibration isolation component (2) disposed within the bearing cavity (11), the vibration isolation component (2) including a plurality of acoustic black hole components (21) stacked periodically. Each acoustic black hole component (21) includes an acoustic black hole structure (211) with different wave impedances, an elastic column (212), and a first linear elastic member (213). One acoustic black hole structure (211) is connected to an adjacent acoustic black hole structure (211) through the elastic column (212). A plurality of the first linear elastic members (213) are provided, and each elastic column (212) is circumferentially connected to the inner side wall of the bearing cavity (11) through a plurality of the first linear elastic members (213). Two acoustic black hole components (21) at both ends in the stacking direction are each connected to a second linear elastic member (214), and one acoustic black hole component (21) at one end is connected to the inner top wall of the bearing cavity (11) through one second linear elastic member (214), and the acoustic black hole component (21) at the other end is connected to the inner bottom wall of the bearing cavity (11) through the other second linear elastic member (214).

2. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 1, characterized in that: Each of the first linear elastic members (213) and the second linear elastic members (214) is provided as a linear spring.

3. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 1, wherein: The wave impedance of the second linear elastic member (214) is different from any one of the wave impedances of the acoustic black hole structure (211), the elastic column (212), and the first linear elastic member (213) included in each acoustic black hole component (21).

4. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 1, characterized in that: The bearing shell (1) includes a top cover (12), a bottom cover (13), and a side shell (14). The top cover (12) and the bottom cover (13) are both used for connection with a controlled structure, and the top cover (12) and the bottom cover (13) can be detachably connected to both ends of the side shell (14) respectively to form the bearing cavity (11).

5. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 4, characterized in that: The top cover (12), the bottom cover (13), and the material of each acoustic black hole structure (211) are provided as aluminum, and the side shell (14) and each elastic column (212) are made of rubber material; the material of each of the first linear elastic members (213) and the second linear elastic members (214) is provided as steel.

6. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 1, wherein: Each of the acoustic black hole structures (211) comprises an eccentric disk (215), a first connecting ring (216) and a second connecting ring (217); the eccentric disk (215) comprises a connecting column (218) and a vibration-damping disk (219) arranged around the connecting column (218); the connecting column (218) is fixedly connected to the corresponding elastic column (212); the thickness of the longitudinal section of the vibration-damping disk (219) decreases exponentially from the side affixed to the connecting column (218) in a direction away from the connecting column (218); the first connecting ring (216) is fixedly arranged on the circumferential edge of the eccentric disk (215), and the second connecting ring (217) is fixedly arranged on the side of the first connecting ring (216) facing away from the elastic column (212).

7. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 6, characterized in that: The connecting column (218) and the elastic column (212) are both configured as rectangular columns, the vibration damping disk (219) is configured as a rectangular disk, and the first connecting ring (216) and the second connecting ring (217) are both configured as rectangular rings.

8. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 7, characterized in that: The expression for the thickness decreasing exponent of the longitudinal section of the vibration damping disc (219) is h(w i ) = h1 + aw i n , i = 1, 2, 3, 4, where h(w i ) represents the thickness of the vibration damping disc (219), w i , i = 1, 2, 3, 4 respectively represent the distances from any point on the four sides of the vibration damping disc (219) to the corresponding parallel sides of the upper surface of the connecting column (218), h1 represents the thickness of the thin end of the vibration damping disc (219), a represents the coefficient, and n is greater than or equal to 2.

9. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 6, characterized in that: The thickness of the first connecting ring (216) is the same as the thickness of the outer end of the vibration damping disc (219).

10. The composite broadband vibration isolator based on a periodic acoustic black hole and a linear elastic member according to claim 6, characterized in that: The second connecting ring (217) is made of damping material.

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