A vibration isolation device having both a local resonance characteristic and a particle damping characteristic

Abstract

The application discloses a vibration isolation device with both local resonance characteristics and particle damping characteristics, comprising a metamaterial vibration isolation column, a flexible protective cylinder and a limiting connecting seat; the metamaterial vibration isolation column comprises a flexible honeycomb sandwich and a planar vibration isolation array and is clamped by the flexible protective cylinder; the limiting connecting seat comprises a damping pad, a rigid plate, a limiting groove and a limiting guide column; the planar vibration isolation array comprises a thin-walled polyhedral shell, a hollow ball, a group of granular particles and a tension spring; the hollow ball is connected with the thin-walled polyhedral shell through the tension spring as a common local oscillator, and the group of granular particles is arranged in the hollow ball to form a particle damping local oscillator together with the hollow ball; and the metamaterial vibration isolation column is a double-oscillator periodic three-dimensional metamaterial, which can effectively realize three-dimensional vibration isolation.

Description

Technical Field

[0001] This invention relates to the field of artificial elastic wave metamaterials, and in particular to a three-dimensional metamaterial vibration isolation device that simultaneously possesses local resonance characteristics and particle damping characteristics. Background Technology

[0002] Metamaterials are a new class of artificial periodic or quasi-periodic materials with extraordinary physical properties, capable of altering the propagation characteristics of electromagnetic waves, sound waves, and elastic waves in media. When waves propagate in metamaterials, they interact with the metamaterial structure, generating bandgap structures that suppress wave propagation. The proposed localized resonant bandgap mechanism breaks the limitations imposed by metamaterial lattice constants and matrix material parameters on bandgap frequencies, providing a foundation for opening lower-frequency bandgap structures.

[0003] Particle damping technology is a passive vibration reduction and isolation technology. Its principle is to add particles into a cavity and use the friction and collision between particles or between particles and the cavity to convert mechanical energy into sound energy and heat energy, thereby generating a damping effect. At the same time, the momentum exchange between the particles and the components can also play a role in suppressing vibration. Currently, this technology has been widely used in the fields of aerospace and mechanical engineering.

[0004] Currently, vibration isolation devices often only achieve vibration isolation in a single direction, either horizontally or vertically. However, in actual engineering projects, the vibration components are often very complex, making single-direction vibration isolation increasingly difficult to meet practical engineering needs. Existing three-dimensional vibration isolation supports typically decouple horizontal and vertical vibration isolation and then assemble them into a complete vibration isolation device, thereby achieving three-dimensional vibration isolation. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-dimensional metamaterial vibration isolation device that simultaneously possesses local resonance characteristics and particle damping characteristics. Combining the advantages of metamaterial local resonance mechanism and particle damper, the three-dimensional metamaterial achieves three-dimensional vibration isolation and noise reduction in both horizontal and vertical directions over a wide, low-frequency range.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A vibration isolation device that simultaneously possesses local resonance characteristics and particle damping characteristics includes a metamaterial vibration isolation column, a flexible protective cylinder, and a limiting connection seat.

[0008] The metamaterial vibration isolation column comprises a flexible honeycomb sandwich layer and a planar vibration isolation array. The flexible honeycomb sandwich layer is made of a damping elastic material. The upper and lower surfaces of the flexible honeycomb sandwich layer are provided with several polygonal grooves in the form of a polygonal array, forming a honeycomb shape. The polygonal grooves are not interconnected, and the depth of the polygonal grooves is half the thickness of the planar vibration isolation array. The planar vibration isolation arrays are connected by the flexible honeycomb sandwich layer. The flexible honeycomb sandwich layer and the planar vibration isolation array are alternately stacked along the plane normal direction to form the metamaterial vibration isolation column.

[0009] The flexible protective cylinder is made of damping elastic material and has a vertically penetrating interior. The metamaterial vibration isolation column is installed inside the flexible protective cylinder, and the inner wall of the flexible protective cylinder is in contact with the outer wall of the metamaterial vibration isolation column.

[0010] The top and bottom of the flexible protective cylinder are both equipped with limiting connecting seats. The limiting connecting seats include a damping pad, a rigid plate, a limiting groove, and a limiting guide post. The damping pad and the limiting groove are respectively installed on the two surfaces of the rigid plate. A limiting guide post that mates with the polygonal groove is installed on the surface of the rigid plate in the limiting groove. The damping pad, the limiting groove, and the limiting guide post are all fixedly connected to the rigid plate.

[0011] Furthermore, the planar vibration isolation array includes a thin-walled polyhedral shell, hollow spheres, a group of loose particles, and tension springs. The thin-walled polyhedral shell is a hollow shell structure, and its planar projection is a regular polygon, consistent with the shape and size of the inner contour of the polygonal groove, allowing the thin-walled polyhedral shell to be embedded in the polygonal groove. The hollow sphere, as a common local oscillator, is placed at the center of the thin-walled polyhedral shell and connected to the thin-walled polyhedral shell by multiple tension springs. Several hanging rings are provided on the outer side of the hollow sphere and the inner side of the thin-walled polyhedral shell for connecting the tension springs. The group of loose particles consists of several rigid small spheres, placed inside some of the hollow spheres, and together with the hollow spheres, constitutes a particle-damped local oscillator. The thin-walled polyhedral shell containing the common local oscillator and the particle-damped local oscillator are arranged at intervals in a concentric polygonal array in the plane, forming a planar vibration isolation array.

[0012] Furthermore, the planar vibration isolation array includes two concentric polygon array forms: array one and array two. In array one, ordinary local oscillators are located on odd-numbered cycles, and particle-damped local oscillators are located on even-numbered cycles. In array two, ordinary local oscillators are located on even-numbered cycles, and particle-damped local oscillators are located on odd-numbered cycles. The two arrays are arranged alternately along the vertical direction to form a three-dimensional metamaterial structure with double oscillator periods in both the horizontal and vertical directions.

[0013] Furthermore, the middle part of the thin-walled polyhedron is a hollow prism, and the upper and lower parts are hollow frustums. When several thin-walled polyhedrons are closely arranged, the structure is stable and has a high load-bearing capacity. At the same time, the hollow frustum part can produce elastic deformation under vertical load, which is beneficial for vertical vibration isolation.

[0014] Furthermore, the hollow sphere is connected by two tension springs, both of which are in a pre-tensioned state and have sufficient pre-tension and remaining stroke, so that the tension springs are always in a tensile state when the hollow sphere vibrates; when the center of mass of the hollow sphere deviates from the center of the thin-walled polyhedral shell, the tension springs are stretched and rotated, providing restoring force to the hollow sphere in all directions, and realizing multi-directional local resonance.

[0015] Furthermore, the metamaterial vibration isolation column is a three-dimensional metamaterial structure with a double oscillator period. The metamaterial vibration isolation column has a local resonance bandgap and a Bragg scattering bandgap in both the horizontal and vertical directions. Vibrations in the horizontal and vertical directions cannot propagate within the bandgap, and vibrations in all directions within the passband are dissipated by the particle friction and collision damping of the granular particle group, thus achieving three-dimensional vibration isolation with both local resonance and particle damping characteristics.

[0016] Furthermore, the metamaterial vibration isolation column can undergo interlaminar shear deformation under horizontal load, dissipating the vibration energy in the horizontal direction and achieving vibration isolation in the horizontal direction.

[0017] Furthermore, the limiting groove of the limiting connecting seat clamps the end of the flexible protective cylinder with the adjacent limiting guide post, and all the limiting guide posts are embedded in the corresponding polygonal grooves in the flexible honeycomb sandwich, thereby achieving support and limiting of the metamaterial vibration isolation column.

[0018] Furthermore, this vibration isolation device can achieve vibration isolation in both horizontal and vertical vibrations in the 600–900 Hz frequency band and above 1200 Hz frequency band.

[0019] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0020] 1. The hollow spheres and the group of loose particles in this invention together form a particle-damped local oscillator, so that the local resonance mechanism and the particle damping mechanism work together. This not only provides a widening of the local resonance bandgap and the vibration isolation frequency band, but also the particle damping has a good dissipation effect on vibrations in both the passband and the bandgap, thereby improving the vibration isolation effect.

[0021] 2. In this invention, the ordinary local oscillator and the particle-damped local oscillator are arranged at intervals in both the horizontal and vertical directions, so that the metamaterial vibration isolation column has a double oscillator period in both the horizontal and vertical directions, which expands the band gap range of the device under horizontal and vertical vibration and makes the three-dimensional vibration isolation effect more significant.

[0022] 3. In this invention, the hollow sphere and the thin-walled multifaceted shell are connected by a tension spring. The tension spring and the hanging ring can be regarded as a hinge, so that the hollow sphere can vibrate in all directions to achieve multi-directional local resonance. This makes the metamaterial vibration isolation column have local resonance band gaps in both vertical and horizontal directions, thus improving the three-dimensional vibration isolation effect.

[0023] 4. The three-dimensional metamaterial vibration isolation device in this invention has a structure that is layered vertically and can generate shear deformation under horizontal load. The flexible honeycomb interlayer and the flexible protective cylinder are both made of high-damping elastic materials, which is beneficial to the dissipation of lateral vibration energy.

[0024] 5. The three-dimensional metamaterial vibration isolation device of the present invention does not require decoupling and then connecting the vertical and horizontal vibration isolation devices. It relies on its own three-dimensional structure and the reasonable setting of the particle damping local oscillator to achieve three-dimensional vibration isolation. The structure is simpler and more compact, and the reliability is higher.

[0025] 6. The three-dimensional metamaterial vibration isolation device of the present invention adopts a large number of hollow structures, which makes it lighter and more flexible in structure, easy to install and debug. The ideal vibration isolation effect can be obtained by changing the number of horizontal and vertical periods of the structure according to actual needs.

[0026] 7. The limiting groove of the limiting connector is clamped to the end of the flexible protective cylinder with the adjacent limiting guide post. All the limiting guide posts are embedded in the corresponding polygonal grooves in the flexible honeycomb sandwich, so as to support and limit the metamaterial vibration isolation column.

[0027] 8. Metamaterial vibration isolation columns can undergo interlaminar shear deformation under horizontal loads, dissipating horizontal vibration energy and achieving horizontal vibration isolation. The flexible protective cylinder can prevent excessive overall deformation.

[0028] 9. This invention possesses both local resonance characteristics and particle damping characteristics, and has a good vibration isolation effect for both horizontal and vertical vibrations. Its vibration isolation effect is most significant in the 600-900Hz frequency band and the frequency band above 1200Hz. Attached Figure Description

[0029] Figure 1 These are exploded structural diagrams and enlarged exploded partial structural diagrams of embodiments of the present invention;

[0030] Figure 2 This is a schematic diagram of the overall assembly of an embodiment of the present invention;

[0031] Figure 3 This is an assembly diagram of the present invention with the top limiting connector removed;

[0032] Figure 4 This is a schematic diagram of the limiting connection plate structure according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the flexible protective cylinder structure according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the cross-sectional structure of the metamaterial vibration isolation column according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the cross-sectional structure of the flexible honeycomb sandwich structure according to an embodiment of the present invention;

[0036] Figure 8 This is a schematic diagram of the cross-sectional structure of a thin-walled polyhedral shell containing a particle-damped local oscillator according to an embodiment of the present invention;

[0037] Figure 9 Embodiments of the present invention Figure 2 Schematic diagram of the cross-sectional structure along direction A;

[0038] Figure 10 Embodiments of the present invention Figure 9 Schematic diagram of the cross-sectional structure along the B direction;

[0039] Figure 11 Embodiments of the present invention Figure 9 Schematic diagram of the cross-sectional structure along the C-direction;

[0040] Figure 12 A comparison of the transverse frequency response curves of the localized oscillator with and without particle damping in an embodiment of the present invention;

[0041] Figure 13 This is a comparison of the vertical frequency response curves with and without particle-damped local oscillators in an embodiment of the present invention.

[0042] The attached figures are labeled as follows: 1-Limiting connector, 2-Flexible protective cylinder, 3-Metamaterial vibration isolation column, 10-Damping pad, 11-Rigid plate, 110-Limiting groove, 111-Limiting guide post, 30-Flexible honeycomb sandwich, 300-Polygonal groove, 31-Planar vibration isolation array, 31a-Array one, 31b-Array two, 310-Thin-walled polyhedral shell, 311-Inner wall hanging ring, 312-Hollow sphere, 313-Surface hanging ring, 314-Particle group, 315-Tension spring. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] In the description of this invention, unless otherwise stated, "several" or "a plurality of" means two or more; the terms "upper," "lower," "inner," "outer," "lateral," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0045] This invention proposes a three-dimensional metamaterial vibration isolation device that simultaneously possesses local resonance characteristics and particle damping characteristics. Combining the advantages of local resonance mechanism and particle damping, a three-dimensional metamaterial with a double oscillator period in both the vertical and horizontal directions is formed by arranging ordinary local oscillators and particle-damped local oscillators at intervals, which can effectively achieve three-dimensional vibration isolation.

[0046] like Figures 1 to 4 As shown, the three-dimensional metamaterial vibration isolation device with local resonance and particle damping characteristics in this embodiment of the invention includes: a limiting connection seat 1, a flexible protective cylinder 2, and a metamaterial vibration isolation column 3.

[0047] The metamaterial vibration isolation column 3 is tightly fitted by the flexible protective cylinder 2, and its end is clamped and fixed by the limiting groove 110 and the limiting guide post 111 of the limiting connecting seat 1. All components of the limiting connecting seat 1 are fixedly connected. The damping pad 10 and the rigid plate 11 are glued together, while the rigid plate 11 is welded to the limiting groove 110 and the limiting guide post 111. Both the damping pad 10 and the rigid plate 11 have through bolt holes for connection to external components. In this embodiment, the damping pad 10, the flexible protective cylinder 2, and the flexible honeycomb interlayer 30 are all made of rubber, while the rigid plate 11, the limiting groove 110, and the limiting guide post 111 are all made of stainless steel.

[0048] like Figure 5 As shown, the flexible protective cylinder 2 is internally connected, and its inner wall shape is consistent with the outer contour of the metamaterial vibration isolation column 3. Its outer wall shape is consistent with the inner contour of the limiting groove 110. The flexible protective cylinder 2 can clamp the metamaterial vibration isolation column 3, restricting it from undergoing excessive shear deformation in the horizontal direction, and at the same time, it can protect it from external interference.

[0049] Specifically, such as Figure 6 As shown, the metamaterial vibration isolation column 3 is a periodic structure formed by superimposing a planar vibration isolation array 31 and a flexible honeycomb sandwich layer 30, wherein array one 31a and array two 31b are arranged alternately to form a double oscillator period.

[0050] like Figure 7As shown, the flexible honeycomb interlayer 30 is honeycomb in shape, and its upper and lower surfaces are provided with a number of polygonal grooves 300 in the form of a polygonal array. The polygonal grooves 300 are not interconnected, and their depth is half the thickness of the planar vibration isolation array 31. Two layers of flexible honeycomb interlayer 30 can completely wrap one layer of planar vibration isolation array 31.

[0051] The planar vibration isolation array includes a thin-walled polyhedral shell 310, a hollow sphere 312, a group of loose particles 314, and tension springs 315. Two adjacent planar vibration isolation arrays 31 are connected by a flexible honeycomb sandwich 30. The planar vibration isolation arrays 31 and the flexible honeycomb sandwich 30 are stacked along the plane normal direction to form a metamaterial vibration isolation column. The middle part of the thin-walled polyhedral shell 310 is a hollow prism, and the upper and lower parts are hollow frustums. When several thin-walled polyhedral shells are closely arranged, they have a high load-bearing capacity. At the same time, the hollow frustums can produce a certain elastic deformation under vertical load, which is beneficial for vertical vibration isolation. The hollow sphere 312 is connected by two tension springs 315. Both tension springs are in a pre-tensioned state and have sufficient pre-tension and remaining stroke, so that the tension springs are always in tension when the hollow sphere vibrates. When the center of mass of the hollow sphere deviates from the center of the thin-walled polyhedral shell, the tension springs 315 are stretched and rotated, providing restoring force to the hollow sphere in various directions and realizing multi-directional local resonance.

[0052] like Figure 1 and Figure 8 As shown, the thin-walled polyhedral shell 310 is a hollow thin-walled shell structure. Its planar projection is a regular polygon, and its shape and size are consistent with the inner contour of the polygonal groove 300, allowing it to be embedded in the polygonal groove 300. The hollow sphere 312, as a general local oscillator, is placed at the center of the thin-walled polyhedral shell 310 and is connected to the thin-walled polyhedral shell 310 by a tension spring 315. A hanging ring 311 is provided on the inner side of the thin-walled polyhedral shell 310, and a hanging ring 313 is provided on the outer side of the hollow sphere 312, for connecting the tension spring 315. The thin-walled polyhedral shell 310, the hollow sphere 312, and the tension spring can be considered as hinged. The loose particle group 314 is placed inside the hollow sphere, and together with the hollow sphere, it constitutes a particle-damped local oscillator. The granular particle group 314 consists of multiple rigid spheres placed inside partially hollow spheres, forming a particle-damped local oscillator together with the hollow spheres. Thin-walled polyhedral shells containing ordinary local oscillators and particle-damped local oscillators are arranged in a concentric polygon array in a plane, forming a planar vibration isolation array. The planar vibration isolation array includes two types of concentric polygon arrays. In array one 31a, the ordinary local oscillators are located on odd-numbered loops, and the particle-damped local oscillators are located on even-numbered loops. In array two 31b, the ordinary local oscillators are located on even-numbered loops, and the particle-damped local oscillators are located on odd-numbered loops. The two arrays are arranged alternately in the vertical direction, forming a three-dimensional metamaterial structure with double oscillator periods in both the horizontal and vertical directions.

[0053] like Figure 9As shown, the limiting guide post 111 is embedded in the polygonal groove 300 of the flexible honeycomb sandwich 30, and together with the flexible protective cylinder 2 and the limiting groove 110, it limits the metamaterial vibration isolation column 3 horizontally and vertically. The limiting guide post 111 also undertakes the function of transmitting load and vibration to the thin-walled polyhedral shell 310. Array 1 31a and array 2 31b are arranged vertically at intervals to form a double-oscillator periodic structure.

[0054] like Figures 10 to 11 As shown, in array 31a and array 31b of the planar vibration isolation array 31, ordinary local oscillators and particle-damped local oscillators are arranged at intervals along the plane in the form of a concentric polygon array, forming a double-oscillator periodic structure in the plane.

[0055] This invention provides simulation results of the 0-2000Hz harmonic response of a vibration isolation device under different configurations. The simulation results show that the three-dimensional metamaterial with both local resonance and particle damping characteristics used in this invention has a significant suppression effect on both horizontal and vertical vibrations.

[0056] like Figure 12 As shown, for lateral vibration, the vibration isolation effect of the isolation device is better than that of the undamped local oscillator when there is a particle-damped local oscillator. It has a significant vibration isolation effect in the frequency bands of 582-1103Hz and above 1200Hz, indicating that the combination of local resonance characteristics and particle damping characteristics can enhance the lateral vibration isolation effect of the metamaterial isolation device.

[0057] like Figure 13 As shown, for vertical vibration, when there is a particle-damped local oscillator, the vibration isolation effect of the vibration isolation device is better than that without a particle-damped local oscillator in the frequency range above 457Hz. It has a significant vibration isolation effect in the frequency range of 600-900Hz and above 1200Hz, indicating that the combination of local resonance characteristics and particle damping characteristics can enhance the vertical vibration isolation effect of the metamaterial vibration isolation device.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibration isolation device possessing both local resonance characteristics and particle damping characteristics, characterized in that, This includes metamaterial vibration isolation columns, flexible protective cylinders, and limiting connection seats; The metamaterial vibration isolation column comprises a flexible honeycomb sandwich layer and a planar vibration isolation array. The flexible honeycomb sandwich layer is made of a damping elastic material. The upper and lower surfaces of the flexible honeycomb sandwich layer are provided with several polygonal grooves in the form of a polygonal array, forming a honeycomb shape. The polygonal grooves are not interconnected, and the depth of the polygonal grooves is half the thickness of the planar vibration isolation array. The planar vibration isolation arrays are connected by the flexible honeycomb sandwich layer. The flexible honeycomb sandwich layer and the planar vibration isolation array are alternately stacked along the plane normal direction to form the metamaterial vibration isolation column. The flexible protective cylinder is made of damping elastic material and has a vertically penetrating interior. The metamaterial vibration isolation column is installed inside the flexible protective cylinder, and the inner wall of the flexible protective cylinder is in contact with the outer wall of the metamaterial vibration isolation column. The flexible protective cylinder is equipped with limit connecting seats at both the top and bottom. Each limit connecting seat includes a damping pad, a rigid plate, a limit groove, and a limit guide post. The damping pad and the limit groove are respectively installed on the two surfaces of the rigid plate. A limit guide post that mates with the polygonal groove is installed on the surface of the rigid plate in the limit groove. The damping pad, the limit groove, and the limit guide post are all fixedly connected to the rigid plate. The planar vibration isolation array includes a thin-walled polyhedral shell, hollow spheres, a group of loose particles, and tension springs. The thin-walled polyhedral shell is a hollow shell structure with a planar projection that is a regular polygon, matching the shape and size of the inner contour of a polygonal groove, allowing the thin-walled polyhedral shell to be embedded in the polygonal groove. The hollow sphere, as a common local oscillator, is placed at the center of the thin-walled polyhedral shell and connected to it by multiple tension springs. Several hanging rings are provided on the outer side of the hollow sphere and the inner side of the thin-walled polyhedral shell to connect the tension springs. The group of loose particles consists of several rigid small spheres placed inside some of the hollow spheres, forming a particle-damped local oscillator together with the hollow spheres. The thin-walled polyhedral shell containing the common local oscillator and the particle-damped local oscillator are arranged at intervals in a concentric polygonal array in the plane, forming a planar vibration isolation array.

2. The vibration isolation device with both local resonance characteristics and particle damping characteristics as described in claim 1, characterized in that, The planar vibration isolation array includes two concentric polygon array forms: array one and array two. In array one, ordinary local oscillators are located on odd-numbered cycles, and particle-damped local oscillators are located on even-numbered cycles. In array two, ordinary local oscillators are located on even-numbered cycles, and particle-damped local oscillators are located on odd-numbered cycles. The two arrays are arranged alternately along the vertical direction to form a three-dimensional metamaterial structure with double oscillator periods in both the horizontal and vertical directions.

3. The vibration isolation device with both local resonance characteristics and particle damping characteristics as described in claim 1, characterized in that, The thin-walled polyhedron has a hollow prism in the middle and hollow frustums in the upper and lower parts. When several thin-walled polyhedrons are arranged closely, the structure is stable. At the same time, the hollow frustums can undergo elastic deformation under vertical loads, which is beneficial for vertical vibration isolation.

4. The vibration isolation device with both local resonance characteristics and particle damping characteristics according to claim 1, characterized in that, The hollow sphere is connected by two tension springs, both of which are in a pre-tensioned state with sufficient pre-tension and remaining stroke, so that the tension springs are always in tension when the hollow sphere vibrates. When the center of mass of the hollow sphere deviates from the center of the thin-walled polyhedral shell, the tension springs are stretched and rotated, providing restoring force to the hollow sphere in all directions, thus achieving multi-directional local resonance.

5. The vibration isolation device with both local resonance characteristics and particle damping characteristics according to claim 1, characterized in that, The metamaterial vibration isolation column is a three-dimensional metamaterial structure with a double oscillator period. The metamaterial vibration isolation column has local resonance band gap and Bragg scattering band gap in both the horizontal and vertical directions. Vibrations in the horizontal and vertical directions cannot propagate within the band gap. Vibrations in all directions within the passband are dissipated by the particle friction and collision damping of the granular particle group, thus achieving three-dimensional vibration isolation with both local resonance and particle damping characteristics.

6. A vibration isolation device possessing both local resonance characteristics and particle damping characteristics according to claim 1 or 5, characterized in that, The metamaterial vibration isolation column can undergo interlaminar shear deformation under horizontal load, dissipating the vibration energy in the horizontal direction and achieving vibration isolation in the horizontal direction.

7. The vibration isolation device with both local resonance characteristics and particle damping characteristics according to claim 1, characterized in that, The limiting groove of the limiting connector clamps the end of the flexible protective cylinder with the adjacent limiting guide post. All the limiting guide posts are embedded in the corresponding polygonal grooves in the flexible honeycomb sandwich, thereby achieving support and limiting of the metamaterial vibration isolation column.

8. The vibration isolation device with both local resonance characteristics and particle damping characteristics according to claim 1, characterized in that, It can achieve vibration isolation in the lateral and vertical vibrations of the 600~900 Hz frequency band and above 1200 Hz frequency band.

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