A kind of absorption and isolation integrated metamaterial damper

Abstract

The application relates to a kind of absorbing and isolating integrated metamaterial damper, comprising: vibration isolation component, for being placed between excitation source and controlled structure, including upper cover plate and lower cover plate, and circumferentially distributed and supported between upper cover plate and lower cover plate for transmitting load and providing impedance mismatch cosine beam, upper cover plate and lower cover plate are used to be fixedly connected to excitation source and controlled structure respectively;Heavy spiral acoustic black hole vibrator, including black hole spiral beam connected to upper cover plate and / or lower cover plate, weight block arranged at the end of black hole spiral beam, black hole spiral beam extends spirally to form acoustic black hole effect, and weight block is used to adjust the local resonance frequency of heavy spiral acoustic black hole vibrator.The application further lowers the local resonance natural frequency under the combination of black hole spiral beam and weight block for the damper of periodic structure, so that the damper generates 100Hz low frequency band gap through local resonance.

Description

Technical Field

[0001] This application relates to the field of vibration damping device technology, and in particular to an integrated absorption and isolation metamaterial vibration damper. Background Technology

[0002] Currently, solid rubber vibration dampers and pipeline / base vibration absorbers are the mainstream vibration damping components in the marine industry. Different rubber vibration dampers are selected based on the load of the equipment. Traditional solid rubber vibration dampers have the disadvantages of poor low-frequency vibration isolation and insufficient low-frequency line spectrum control. Low-frequency vibration damping and low-frequency line spectrum isolation of mechanical equipment are the bottleneck problems that need to be overcome in vibration dampers. Summary of the Invention

[0003] This application provides an integrated absorption and isolation metamaterial vibration damper to solve the problems of insufficient low-frequency vibration isolation and low-frequency line spectrum control in traditional rubber vibration dampers in related technologies.

[0004] This application provides an integrated absorption and isolation metamaterial vibration damper, comprising: A vibration isolation assembly, which is placed between an excitation source and a controlled structure, includes an upper cover plate and a lower cover plate, and a cosine beam circumferentially distributed and supported between the upper cover plate and the lower cover plate for transmitting loads and providing impedance mismatch, wherein the upper cover plate and the lower cover plate are respectively fixedly connected to the excitation source and the controlled structure. A counterweighted spiral acoustic black hole oscillator includes a black hole spiral beam connecting the upper and / or lower cover plates, a counterweight block disposed at the end of the black hole spiral beam, the black hole spiral beam extending in a spiral shape to form an acoustic black hole effect, and the counterweight block used to adjust the local resonant frequency of the counterweighted spiral acoustic black hole oscillator.

[0005] In some embodiments, the helix shape of the black hole helical beam is any one of an Archimedean spiral, a logarithmic spiral, or a nautiloid spiral.

[0006] In some embodiments, the counterweight is fixed to the end of the black hole spiral beam by means of bolting, welding, gluing or embedded snap-fit.

[0007] In some embodiments: the upper cover plate and / or the lower cover plate have through holes for accommodating the counterweight helical acoustic black hole oscillator, the black hole helical beam of the counterweight helical acoustic black hole oscillator is located in the through hole and connected to the inner wall of the through hole, and the thickness of the black hole helical beam gradually decreases in the direction of extension of the counterweight block.

[0008] In some embodiments: the cross-sectional height or width of the cosine beam changes periodically along its length according to a cosine function, and the material of the cosine beam is a metal material and / or a rubber material; When the cosine beam is made of metal, the vibration damper is configured as a metamaterial vibration absorber; when the cosine beam is made of rubber, the vibration damper is configured as a metamaterial vibration damper.

[0009] In some embodiments: the black hole spiral beam is provided as one or more. If there are multiple black hole spiral beams, the ends of the multiple black hole spiral beams are connected to a single counterweight, and the multiple black hole spiral beams are arranged in a circle with the counterweight as the center. Alternatively, if there are multiple black hole spiral beams, the ends of the multiple black hole spiral beams are all connected to the counterweight.

[0010] In some embodiments: the upper cover plate and the lower cover plate are both connected to the counterweight helical acoustic black hole oscillator, the vibration damper is provided in two or more sets, the two or more sets of vibration dampers are connected in series through the upper cover plate and the lower cover plate, and adjacent sets of vibration dampers are spaced apart by spacers to form a vertical periodic structure.

[0011] In some embodiments, it further includes a layered floral acoustic black hole, which is disposed on the inner surface of the upper cover plate and / or the lower cover plate; The layered flower-shaped acoustic black hole includes a central pillar and several layers of flower-shaped blades distributed around the central pillar. The configuration parameters of each layer of flower-shaped blades are the same or different, and the thickness of the flower-shaped blades gradually decreases radially outward.

[0012] In some embodiments: the central column is located at the center of the upper cover plate and / or the lower cover plate, and several layers of flower-shaped leaves are spaced apart along the axial direction of the central column, with each layer of flower-shaped leaves arranged circumferentially around the central column; Alternatively, the central column may be located at the edge of the upper cover plate and / or the lower cover plate, and several layers of the floral-shaped leaves may be spaced apart along the axial direction of the central column, with each layer of the floral-shaped leaves offset to one side of the central column.

[0013] In some embodiments, at least one of the surfaces of the black hole helical beam, the counterweight, and the layered flower-shaped acoustic black hole is covered with a damping material layer, wherein the damping material layer is a viscoelastic damping adhesive, a constraint layer damping structure, or a high-damping alloy coating.

[0014] The beneficial effects of the technical solution provided in this application include: This application provides an integrated absorption and isolation metamaterial vibration damper. The integrated absorption and isolation metamaterial vibration damper includes a vibration isolation component positioned between the excitation source and the controlled structure. This component includes an upper cover plate and a lower cover plate, and a cosine beam circumferentially distributed and supported between the upper and lower cover plates for transmitting loads and providing impedance mismatch. The upper and lower cover plates are respectively fixedly connected to the excitation source and the controlled structure. A counterweighted helical acoustic black hole oscillator is also included, comprising a black hole helical beam connecting the upper and / or lower cover plates, and a counterweight block disposed at the end of the black hole helical beam. The black hole helical beam extends in a helical shape to form an acoustic black hole effect. The counterweight block is used to adjust the local resonant frequency of the counterweighted helical acoustic black hole oscillator.

[0015] Therefore, the integrated absorption and isolation metamaterial vibration damper of this application arranges a cosine beam between the upper and lower cover plates of the damper. This cosine beam can be made of steel (high stiffness) or rubber (elastomer, low stiffness), and both, including the counterweight helical acoustic black hole oscillator, can dominate the generation of band gaps. When the cosine beam is made of steel, the black hole helical beam dominates the modulation of the low-frequency band gap. When the cosine beam is an elastomer, the combined structure of "upper cover plate - rubber elastomer - lower cover plate" dominates the modulation of the higher-frequency band gap, indicating that band gaps will be generated regardless of whether the cosine beam is made of steel or an elastomer. Compared to traditional solid rubber elastomers, this creates an impedance mismatch of "upper cover plate (high stiffness) - cosine beam (elasticity) - lower cover plate (high stiffness)," maximizing the vibration isolation effect of the rubber metamaterial vibration damper. Simultaneously, the periodic arrangement of the "cosine beam" in the height direction can generate higher-frequency band gaps.

[0016] Furthermore, the counterweighted helical acoustic black hole oscillator of this application is based on an Archimedean spiral or nautilus spiral configuration. A counterweight is added to the black hole helical beam to form a local oscillator. A single black hole helical beam or all black hole helical beams can share a single counterweight, or the ends of multiple black hole helical beams can be connected to counterweights. For non-periodic vibration dampers, the mass of the added counterweight can be replaced, increasing the probability of matching the actual damping frequency. The counterweighted helical acoustic black hole oscillator forms a low-frequency dynamic vibration absorption effect, thus functioning as a vibration damper. The vertically periodically arranged cosine beams, the counterweighted helical acoustic black hole oscillator, and the cover plate together form a low-frequency bandgap effect. The vibration damper incorporates a flower-shaped acoustic black hole to enhance the broadband damping effect. For periodic vibration dampers, the combination of the black hole helical beam and the counterweight further lowers the local resonant natural frequency, allowing the vibration damper to generate a 100Hz low-frequency bandgap through local resonance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the integrated absorption and isolation metamaterial vibration damper according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an integrated absorption and isolation metamaterial vibration damper according to another embodiment of this application; Figure 3 This is a schematic diagram of the structure of the black hole helical beam according to an embodiment of this application; Figure 4 This is a schematic diagram of a single counterweight block connected to the end of a single black hole spiral beam according to an embodiment of this application. Figure 5 This is a schematic diagram of the structure of a single counterweight block connected to the end of multiple black hole spiral beams in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the layered flower-shaped acoustic black hole in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a layered flower-shaped acoustic black hole according to another embodiment of this application; Figure 8 This is a schematic diagram illustrating the modal damping ratio enhancement effect of the layered flower-shaped acoustic black hole in an embodiment of this application. Figure 9 This is a periodic structure band diagram of an embodiment of this application; Figure 10 This is a schematic diagram of the low-frequency bandgap modulation mode of the counterweighted helical acoustic black hole oscillator in an embodiment of this application; Figure 11 This is a band structure diagram of another embodiment of this application; Figure 12 This is a schematic diagram of the low-frequency first bandgap modulation mode of a counterweighted spiral acoustic black hole oscillator (with and without counterweight) according to another embodiment of this application.

[0019] Figure label: 1. Helical acoustic black hole oscillator with counterweight; 2. Layered flower-shaped acoustic black hole; 3. Cosine beam; 4. Mounting hole; 5. Upper cover plate; 6. Lower cover plate; 11. Counterweight block; 12. Black hole helical beam; 13. First damping layer; 21. Central column; 22. Intermediate plate; 23. Flower-shaped blade; 24. Second damping layer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] This application provides an integrated absorption and isolation metamaterial vibration damper, which can solve the problems of insufficient low-frequency vibration isolation and low-frequency line spectrum control of traditional rubber vibration dampers in related technologies.

[0022] See Figures 1 to 5 As shown, this application provides an integrated absorption and isolation metamaterial vibration damper, comprising: A vibration isolation assembly is used to act as a damper between the excitation source and the controlled structure, attenuating the vibration transmitted from the excitation source to the controlled structure. The vibration isolation assembly includes an upper cover plate 5 and a lower cover plate 6, both of which are rectangular flat plates arranged parallel to each other. A cosine beam 3 is circumferentially distributed and supported between the upper cover plate 5 and the lower cover plate 6 to transfer loads and provide impedance mismatch. Mounting holes 4 are provided on both the upper cover plate 5 and the lower cover plate 6 for fixing to the excitation source and the controlled structure, respectively.

[0023] The counterweighted helical acoustic black hole oscillator 1 includes a black hole helical beam 12 connecting an upper cover plate 5 and / or a lower cover plate 6, and a counterweight block 11 disposed at the end of the black hole helical beam 12. The black hole helical beam 12 extends in a helical shape to create an acoustic black hole effect, and the counterweight block 11 is used to adjust the local resonant frequency of the counterweighted helical acoustic black hole oscillator 1. The counterweighted helical acoustic black hole oscillator 1 acts as a vibration absorber, further lowering the local resonant natural frequency, allowing the vibration absorber to generate a 100Hz low-frequency bandgap through local resonance.

[0024] In this embodiment of the integrated absorption and isolation metamaterial vibration damper, a cosine beam 3 is arranged between the upper cover plate 5 and the lower cover plate 6 of the damper. This cosine beam 3 can be made of steel (high stiffness) or rubber (elastomer, low stiffness). A counterweight helical acoustic black hole oscillator 1 can primarily generate a bandgap. When the cosine beam 3 is made of steel, the black hole helical beam 12 primarily controls the low-frequency bandgap. When the cosine beam 3 is an elastomer, the combined structure of the "upper cover plate - rubber elastomer - lower cover plate" primarily controls the higher-frequency bandgap, indicating that a bandgap will be generated regardless of whether the cosine beam 3 is made of steel or an elastomer.

[0025] Furthermore, the counterweighted helical acoustic black hole oscillator of this application is based on an Archimedean spiral or nautilus spiral configuration. A counterweight 11 is added to the black hole helical beam 12 to form a local oscillator. A single black hole helical beam 12 or all black hole helical beams 12 can share a single counterweight 11. For non-periodic vibration dampers, the mass of the added counterweight 11 can be replaced, increasing the probability of matching the actual damping frequency. The counterweighted helical acoustic black hole oscillator 1 then functions as a vibration absorber. For periodic vibration dampers, the combination of the black hole helical beam 12 and the counterweight 11 further lowers the local resonant natural frequency, allowing the damper to generate a 100Hz low-frequency bandgap through local resonance.

[0026] In some alternative embodiments: see Figures 1 to 5 As shown in the embodiment of this application, an integrated absorption and isolation metamaterial vibration damper is provided. The spiral shape of the black hole spiral beam 12 of the vibration damper is any one of the Archimedean spiral, logarithmic spiral or nautilus spiral.

[0027] If the black hole spiral beam 12 follows the nautilus spiral pattern on the horizontal plane, then

[0028] in, It is spiral-shaped. For the helix angle, This represents the initial spiral length of the nautilus. For example, the helical coefficient of the nautilus. Figure 3 As shown.

[0029] If the black hole spiral beam 12 satisfies the Archimedean spiral law on the horizontal plane, then

[0030] in, This is the Archimedes spiral coefficient.

[0031] If the configuration of cosine beam 3 satisfies the cosine function configuration, then...

[0032] in, The height of the cosine beam. For the half-wave high amplitude of the cosine beam, For half the wavelength of the cosine beam, The x-axis is denoted by .

[0033] In some alternative embodiments: see Figures 1 to 5 As shown in the figure, this application embodiment provides an integrated absorption and isolation metamaterial vibration damper. The counterweight 11 of the vibration damper is fixed to the end of the black hole spiral beam 12 by bolt connection, welding, gluing, or embedded snap-fit. The mass of the counterweight 11 can be replaced, increasing the probability of matching with the actual vibration reduction frequency and thus enabling the vibration absorber to function.

[0034] The upper cover plate 5 and / or the lower cover plate 6 have through holes that extend vertically to accommodate the counterweight helical acoustic black hole oscillator 1. The black hole helical beam 12 containing the counterweight helical acoustic black hole oscillator 1 is located inside the through hole and connected to the inner wall of the through hole. The thickness of the black hole helical beam 12 gradually decreases in the direction of extension of the counterweight block 11.

[0035] The height or width of the cosine beam 3 varies periodically along its length according to a cosine function. The material of the cosine beam 3 is metal and / or rubber. When the cosine beam is made of metal, the vibration damper is configured as a metamaterial vibration absorber; when the cosine beam 3 is made of rubber, the vibration damper is configured as a metamaterial vibration damper.

[0036] When the cosine beam 3 has high stiffness (e.g., made of steel), the vibration damper is configured as a metamaterial vibration absorber to attenuate vibrations in specific low-frequency line spectrum bands. It can be used in series with commonly used ship airbag vibration dampers and conventional rubber vibration dampers to compensate for insufficient control of specific low-frequency line spectrum bands (such as shaft frequency, blade frequency, and electrical frequency of mechanical equipment). When the cosine beam 3 has low stiffness (e.g., made of rubber or polyurethane), the vibration damper is configured as a metamaterial vibration damper to attenuate vibrations in broadband and low-frequency line spectrum bands.

[0037] In some alternative embodiments: see Figure 4 and Figure 5 As shown in the illustration, this application provides an integrated absorption and isolation metamaterial vibration damper. The damper has one or more black hole helical beams 12. If multiple black hole helical beams 12 are provided, each end of a single counterweight 11 is connected to a single counterweight 11, and the multiple black hole helical beams 12 are arranged circumferentially around the counterweight 11. Alternatively, each end of multiple black hole helical beams 12 can be connected to a counterweight 11. The counterweight 11 has a cylindrical structure, and its size and material can be changed to easily adjust its natural frequency, thereby matching the frequency being damped.

[0038] like Figure 4 As shown, the counterweighted helical acoustic black hole oscillator 1 of this embodiment contains a single counterweight block 11 and a single black hole helical beam 12. As... Figure 5 As shown, the acoustic black hole oscillator 1 with counterweight helical beams 1 contains multiple black hole helical beams 12 and a single counterweight block 11, with the multiple black hole helical beams 12 sharing a single counterweight block 11. The counterweight block 11 can be bolted or welded to the black hole helical beams 12. In some alternative embodiments: Figure 1 , Figure 6 and Figure 7 As shown in the embodiment of this application, an integrated absorption and isolation metamaterial vibration damper is provided. The vibration damper also includes a layered flower-shaped acoustic black hole 2, which is disposed on the inner surface of the upper cover plate 5 and / or the lower cover plate 6.

[0039] The layered floral acoustic black hole 2 includes a central pillar 21, an intermediate plate 22, and several layers of floral blades 23 distributed around the central pillar 21. The thickness of the floral blades 23 gradually decreases radially outward. Each layer of floral blades 23 surrounds an intermediate plate 22 with internal threads. Each layer of floral blades 23 is stacked on the central pillar 21 with external threads. The central pillar 21 is mounted on the lower cover plate 6. The configuration parameters of each layer of floral blades 23 can be different depending on the internal space of the damper.

[0040] The central column 21 is centrally located at the center of the upper cover plate 5 and / or the lower cover plate 6. Several layers of floral-shaped blades 23 are spaced apart along the axial direction of the central column 21, with each layer of floral-shaped blades 23 arranged circumferentially around the central column 21. Alternatively, the central column 21 is located to the side at the edge of the upper cover plate 5 and / or the lower cover plate 6, with several layers of floral-shaped blades 23 spaced apart along the axial direction of the central column 21, with each layer of floral-shaped blades 23 offset to one side of the central column 21.

[0041] At least one of the surfaces of the black hole helical beam 12, the counterweight 11, and the layered flower-shaped acoustic black hole 2 is covered with a damping material layer, which is a viscoelastic damping adhesive, a constraint layer damping structure, or a high-damping alloy coating. Specifically, a first damping layer 13 is covered on the surface of the black hole helical beam 12, and a second damping layer 24 is covered on the surface of the flower-shaped blades 23. The first damping layer 13 and the second damping layer 24 are used for energy dissipation.

[0042] In some alternative embodiments: see Figure 1 , Figure 6 and Figure 8 As shown in the embodiment of this application, an integrated absorption and isolation metamaterial vibration damper is provided. The upper cover plate 5 of the vibration damper is connected to a counterweight helical acoustic black hole vibrator 1, and a layered flower-shaped acoustic black hole 2 is connected to the lower cover plate 6. The upper cover plate 5 and the lower cover plate 6 are 130 mm in length and width, 3 mm in thickness, and are made of steel. The radius of the mounting hole 4 is 4 mm.

[0043] Cosine beam half-wave height amplitude of cosine beam 3 For 5 mm, the half wavelength of the cosine beam The length is 70 mm, the height of cosine beam 3 has 2 cycles, the length of the rectangle at the intersection of cosine beam 3 is 10 mm and the height is 2 mm, and the material of cosine beam 3 is rubber.

[0044] Black hole helical beam with counterweight helical acoustic black hole oscillator 1 and 12 helical angles Nautilus initial spiral length Nautilus helical coefficient The black hole spiral beam 12 is embedded with the upper cover plate 5. The counterweight 11 is a cylinder with a diameter of 4 mm and a height of 5 mm, made of lead, and its top circumference is connected to the black hole spiral beam 12. The thickness of the first damping layer 13 is 1 mm, and the helix angle of the first damping layer 13 is... .

[0045] The layered flower-shaped acoustic black hole 2 consists of two layers, and its structure is as follows: Figure 4 As shown, the flower-shaped blades 23 are an 11-leaf, 2-layer flower-shaped Archimedean spiral acoustic black hole structure. The central pillar 21 has a diameter of 4 mm, the middle plate 22 has a thickness of 3 mm, and the residual thicknesses of the lower and upper flower-shaped blades 23 are 0.5 mm each; the spiral angles of the lower and upper flower-shaped blades 23 are respectively... =[ , ]、 =[ , The spiral heights of the lower and upper floral leaves 23 are 3 mm each; the Archimedean spiral coefficients of the lower and upper floral leaves 23 are both... .

[0046] The helical angles of the second damping layer 24 on the lower and upper flower-shaped leaves 23 are divided into [ , ]、 =[ , The second damping layer 24 has a thickness of 1 mm, ultimately forming a structure like... Figure 1 The image shows an integrated absorption and isolation metamaterial vibration damper. The material parameters used in the calculations are as follows: steel density 7850 kg / m³, Young's modulus 2.1e11 Pa, Poisson's ratio 0.49, damping ratio 0.005; hard rubber density 1000 kg / m³, Young's modulus 1e9 Pa, Poisson's ratio 0.49, damping ratio 0.2; damping material 1000 kg / m³, Young's modulus 3e7 Pa, Poisson's ratio 0.49, damping ratio 0.4.

[0047] Specifically, to verify Figure 1 The layered floral acoustic black hole 2 of the integrated absorption and isolation metamaterial vibration damper shown exhibits a damping enhancement effect. With floral blades of equal mass and cross-section, the modal damping ratio enhancement effect of the layered floral acoustic black hole 2 is compared to, for example... Figure 8 As shown, the layered flower-shaped acoustic black hole 2 (i.e. Figure 8 The modal density of the ABH flower is more abundant, and the modal damping ratio is significantly improved.

[0048] In some alternative embodiments: see Figure 2As shown in the embodiment of this application, an integrated absorption and isolation metamaterial vibration damper is provided. The upper cover plate 5 and the lower cover plate 6 of the vibration damper are both connected to a counterweight spiral acoustic black hole oscillator 1. The vibration damper is provided with two or more sets, which are connected in series through the upper cover plate 5 and the lower cover plate 6. Adjacent sets of vibration dampers are spaced apart by spacers to form a vertical periodic structure.

[0049] The integrated absorption and isolation metamaterial vibration damper of this embodiment includes a counterweight helical acoustic black hole oscillator 1, a cosine beam 3, mounting holes 4, an upper cover plate 5, and a lower cover plate 6. Its main characteristic dimensions are consistent with the previous embodiment. The lower cover plate 6 is also embedded with the counterweight helical acoustic black hole oscillator 1, forming two periods in the height direction. To avoid structural interference, a 1 mm thick shim is added between the upper cover plate 5 and the lower cover plate 6 of the two sets of vibration dampers, ultimately forming the following... Figure 2 The image shows an integrated absorption and isolation metamaterial vibration damper.

[0050] Specifically, to verify the low-frequency bandgap effect (below 100Hz) of the integrated absorption and isolation metamaterial vibration damper of this application embodiment, a periodic boundary was set in the height direction, and periodic structural bandgap calculations were performed, such as... Figure 9 As shown, the first bandgap occurs in the frequency range [54.5 Hz, 62.7 Hz]; the second bandgap occurs in the frequency range [80.3 Hz, 88.4 Hz].

[0051] Vibration behavior analysis is performed by selecting the upper and lower boundary modes of the bandgap, such as... Figure 9 At points A, B, C, and D, the opening (point A) and closing (point B) of the first bandgap are dominated by the vibration behavior of the counterweight helical acoustic black hole oscillator 1; the opening (point C) of the second bandgap is dominated by the vibration behavior of the counterweight helical acoustic black hole oscillator 1, while the closing (point D) of the second bandgap is dominated by the vibration behavior of the vibration isolation component of the vibration damper. The vibration modes are as follows: Figure 10 As shown.

[0052] The counterweight helical acoustic black hole oscillator 1 proposed in this embodiment plays a key role in opening and closing the low-frequency bandgap. If the excitation frequency of the device above the vibration damper falls between the bandgap frequencies, the integrated absorption and isolation metamaterial vibration damper of this application will significantly attenuate the low-frequency line spectrum.

[0053] If the rubber cosine beam 3 in this embodiment is replaced with a steel cosine beam 3, and periodic boundary conditions are applied to the upper panel 5 and lower panel 6 of the vibration damper, the band structure calculation results are as follows. Figure 11 As shown, the vibration operation status at typical locations is as follows: Figure 12 As shown, the first bandgap frequency range is [46.5 Hz, 57.7 Hz], and the opening and closing of the bandgap are caused by the local resonance effect of the black hole helical beam 12 containing the counterweight 11.

[0054] The second bandgap frequency range is [60.4 Hz, 79.9 Hz]. The opening of the second bandgap is caused by the local resonance mode of the black hole helical beam 12 containing the counterweight 11, while the closing of the second bandgap is dominated by the motion mode of the entire cosine beam 3. Furthermore, multiple bandgap patterns are generated on the band structure diagram, indicating that the black hole helical beam 12 containing the counterweight 11 has a bandgap control effect on the vibration damper made of the steel cosine beam 3. The first bandgap can be below 100 Hz, and multiple bandgap patterns appear within 200 Hz.

[0055] Based on the previous embodiment, the counterweight 11 is removed. The resulting low-frequency first bandgap of the integrated absorption and isolation metamaterial vibration damper is [68.1 Hz, 77.5 Hz]. The first bandgap frequency of the spiral without counterweight 11 is higher and narrower than that with counterweight 11. Similarly, the bandgap modulation mode is dominated by the vibration mode of the black hole spiral beam 12. Therefore, counterweight 11 is beneficial for opening a lower and wider low-frequency bandgap.

[0056] Working principle This application provides an integrated absorption and isolation metamaterial vibration damper. The integrated absorption and isolation metamaterial vibration damper includes a vibration isolation component positioned between the excitation source and the controlled structure. This component includes an upper cover plate 5 and a lower cover plate 6, and a cosine beam 3 circumferentially distributed and supported between the upper cover plate 5 and the lower cover plate 6 for transmitting loads and providing impedance mismatch. The upper cover plate 5 and the lower cover plate 6 are respectively fixedly connected to the excitation source and the controlled structure. A counterweighted spiral acoustic black hole oscillator 1 is also included, comprising a black hole spiral beam 12 connecting the upper cover plate 5 and / or the lower cover plate 6, and a counterweight block 11 disposed at the end of the black hole spiral beam 12. The black hole spiral beam 12 extends in a spiral shape to form an acoustic black hole effect. The counterweight block 11 is used to adjust the local resonant frequency of the counterweighted spiral acoustic black hole oscillator 1.

[0057] Therefore, the integrated absorption and isolation metamaterial vibration damper of this application arranges a cosine beam 3 between the upper cover plate 5 and the lower cover plate 6 of the damper. This cosine beam 3 can be made of steel (high stiffness) or rubber (elastomer, low stiffness), and both, including the counterweight helical acoustic black hole oscillator 1, can dominate the generation of band gaps. When the cosine beam 3 is made of steel, the black hole helical beam 12 dominates the control of the low-frequency band gap. When the cosine beam 3 is an elastomer, the combined structure of "upper cover plate - rubber elastomer - lower cover plate" dominates the control of the higher-frequency band gap, indicating that band gaps will be generated regardless of whether the cosine beam 3 is made of steel or an elastomer. Compared to traditional solid rubber elastomers, this creates an impedance mismatch of "upper cover plate (high stiffness) - cosine beam (elasticity) - lower cover plate (high stiffness)," thus leveraging the vibration isolation function of the rubber metamaterial vibration damper. Simultaneously, the periodic arrangement of the "cosine beam" in the height direction can generate higher-frequency band gaps.

[0058] Furthermore, the counterweighted helical acoustic black hole oscillator of this application is based on an Archimedean spiral or nautilus spiral configuration. A counterweight 11 is added to the black hole helical beam 12 to form a local oscillator. A single black hole helical beam 12 or all black hole helical beams 12 can share a single counterweight 11. For non-periodic vibration dampers, the mass of the added counterweight 11 can be replaced, increasing the probability of matching the actual damping frequency. The counterweighted helical acoustic black hole oscillator 1 then functions as a vibration absorber. For periodic vibration dampers, the combination of the black hole helical beam 12 and the counterweight 11 further lowers the local resonant natural frequency, allowing the damper to generate a 100Hz low-frequency bandgap through local resonance.

[0059] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0060] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A metamaterial vibration damper integrating absorption and isolation, characterized in that, The shock absorber includes: Vibration isolation assembly, which is placed between the excitation source and the controlled structure, includes an upper cover plate (5) and a lower cover plate (6), and a cosine beam (3) circumferentially distributed and supported between the upper cover plate (5) and the lower cover plate (6) for transmitting load and providing impedance mismatch, wherein the upper cover plate (5) and the lower cover plate (6) are respectively fixedly connected to the excitation source and the controlled structure; The counterweighted spiral acoustic black hole oscillator (1) includes a black hole spiral beam (12) connecting the upper cover plate (5) and / or the lower cover plate (6), a counterweight block (11) disposed at the end of the black hole spiral beam (12), the black hole spiral beam (12) extending in a spiral shape to form an acoustic black hole effect, and the counterweight block (11) used to adjust the local resonant frequency of the counterweighted spiral acoustic black hole oscillator (1).

2. The integrated absorption and isolation metamaterial vibration damper as described in claim 1, characterized in that: The spiral shape of the black hole spiral beam (12) is any one of the Archimedean spiral, logarithmic spiral or nautiloid spiral.

3. The integrated absorption and isolation metamaterial vibration damper as described in claim 1, characterized in that: The counterweight (11) is fixed to the end of the black hole spiral beam (12) by means of bolt connection, welding, adhesive or embedded snap-fit.

4. The integrated absorption and isolation metamaterial vibration damper as described in claim 1, characterized in that: The upper cover plate (5) and / or the lower cover plate (6) are provided with through holes for accommodating the counterweight helical acoustic black hole oscillator (1). The black hole helical beam (12) of the counterweight helical acoustic black hole oscillator (1) is located in the through hole and connected to the inner wall of the through hole. The thickness of the black hole helical beam (12) gradually decreases in the direction of extension of the counterweight block (11).

5. The integrated absorption and isolation metamaterial vibration damper as described in claim 1, characterized in that: The height or width of the cosine beam (3) varies periodically along its length according to the law of the cosine function, and the material of the cosine beam (3) is metal and / or rubber. When the cosine beam (3) is made of metal, the damper is configured as a metamaterial vibration absorber; when the cosine beam (3) is made of rubber, the damper is configured as a metamaterial vibration absorber.

6. The integrated absorption and isolation metamaterial vibration damper as described in claim 1, characterized in that: The black hole spiral beam (12) may be provided as one or more. If there are multiple black hole spiral beams (12), the ends of the multiple black hole spiral beams (12) are connected to a single counterweight (11), and the multiple black hole spiral beams (12) are arranged in a circle with the counterweight (11) as the center. Alternatively, if there are multiple black hole spiral beams (12), the ends of the multiple black hole spiral beams (12) are all connected to the counterweight (11).

7. The integrated absorption and isolation metamaterial vibration damper as described in claim 1, characterized in that: The upper cover plate (5) and the lower cover plate (6) are both connected to the counterweight spiral acoustic black hole oscillator (1). The vibration damper is provided in two or more sets. The two or more sets of vibration dampers are connected in series through the upper cover plate (5) and the lower cover plate (6). Adjacent sets of vibration dampers are spaced apart by spacers to form a vertical periodic structure.

8. A metamaterial vibration damper integrating absorption and isolation as described in any one of claims 1 to 7, characterized in that: It also includes a layered flower-shaped acoustic black hole (2), which is disposed on the inner surface of the upper cover plate (5) and / or the lower cover plate (6); The layered flower-shaped acoustic black hole (2) includes a central pillar (21) and several layers of flower-shaped leaves (23) distributed around the central pillar (21). The configuration parameters of each layer of flower-shaped leaves (23) are the same or different, and the thickness of the flower-shaped leaves (23) gradually decreases radially outward.

9. The integrated absorption and isolation metamaterial vibration damper as described in claim 8, characterized in that: The central column (21) is located at the center of the upper cover plate (5) and / or the lower cover plate (6). Several layers of flower-shaped leaves (23) are spaced apart along the axis of the central column (21), and each layer of flower-shaped leaves (23) is arranged in a circle with the central column (21) as the center. Alternatively, the central column (21) is located at the edge of the upper cover plate (5) and / or the lower cover plate (6), and several layers of flower-shaped leaves (23) are spaced apart along the axis of the central column (21), with each layer of flower-shaped leaves (23) offset to one side of the central column (21).

10. The integrated absorption and isolation metamaterial vibration damper as described in claim 8, characterized in that: At least one of the surfaces of the black hole helical beam (12), the counterweight (11), and the layered floral acoustic black hole (2) is covered with a damping material layer, which is a viscoelastic damping adhesive, a constraint layer damping structure, or a high-damping alloy coating.

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