A directional maze particle damping mechanical metamaterial vibration isolation device

Abstract

The present invention discloses a directional labyrinth particle damping mechanical metamaterial vibration isolation device, comprising a protective shell, a self-lubricating plate, a vibration transmission device, a periodic labyrinth group and a flexible limit protection device; the protective shell comprises an upper shell and a lower shell; the vibration transmission device comprises a vibration imparting plate, a vibration averaging block, a vibration bearing plate, a double-headed stud, an outer splint, a cylindrical nut, a vibration rod compression spring and an inner splint; the periodic labyrinth group comprises a labyrinth block and a spherical particle damper, the labyrinth block is periodically arranged and bonded into a whole, and the spherical particle damper is arranged inside the labyrinth grid; the flexible limit protection device comprises a self-lubricating baffle, an internal threaded pin and a side compression spring; the self-lubricating plate is bonded to the inside of the upper shell and the lower shell and contacts the upper and lower surfaces of the periodic labyrinth group; the vibration transmission device is symmetrically distributed on both sides of the protective shell along the vibration source direction, connecting the periodic labyrinth group with the external vibration source; the flexible limit protection device is symmetrically arranged on both sides of the periodic labyrinth group in the non-vibration source direction, so that it is always located near the central axis of the vibration reduction device.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial elastic wave metamaterials, and in particular to a directional maze particle damping mechanics metamaterial vibration isolation device. Background Art

[0002] Artificial elastic wave metamaterials are a class of composite materials or structures with microstructures as basic building blocks, possessing mechanical properties not found in natural materials. Due to the rich degrees of freedom in the design and regulation of their dynamic properties, they have garnered widespread attention in the engineering field. Adjusting the structural and periodic parameters of elastic wave metamaterials by design to place their band gap within the desired frequency band is an effective vibration isolation method. In recent years, with the rapid development of relevant basic theories and advancements in advanced manufacturing technologies such as 3D printing, they have shown broad application prospects in vibration and noise reduction in engineering construction, mechanical manufacturing, and aerospace. Unlike conventional elastic wave metamaterials that reduce vibration through higher elastic wave losses, labyrinth metamaterials achieve this effect by extending the propagation path of elastic waves and enhancing the interaction between elastic waves to hinder propagation.

[0003] Particle damping technology involves placing granular materials within a structure at a specific filling ratio. During structural vibration, the friction between the particles dissipates the system's vibration energy, thereby achieving vibration reduction. The energy dissipation efficiency of particle damping is closely related to the structural parameters of the particles and the design of the particle cavity. Optimizing these parameters can improve the particle damper's energy dissipation efficiency and, consequently, its vibration reduction effectiveness. Particle dampers have been widely researched and applied due to their low cost, long service life, and excellent vibration and noise reduction.

[0004] At present, although artificial elastic wave metamaterials and particle damping technologies have achieved certain results in the field of vibration and noise reduction, the existing technologies still have obvious shortcomings, mainly manifested in the following aspects:

[0005] Vibration isolation frequency band limitations: Traditional metamaterials rely primarily on designing periodic structures to achieve a bandgap effect, thereby suppressing elastic wave transmission within a specific frequency range. However, this approach is often limited to the bandgap frequency band and lacks ideal vibration isolation across a wide frequency band (especially above 60 Hz), making it difficult to meet the vibration reduction requirements of complex operating conditions.

[0006] Inefficient energy dissipation: While existing particle damping technology offers a simple structure and low cost, energy dissipation relies primarily on limited friction and collisions between particles and between particles and walls. This makes it difficult to achieve sufficient collision frequency and friction, resulting in low elastic wave energy dissipation efficiency. Furthermore, the lack of proper coupling design between particles and the structure leads to uneven vibration energy transfer and significant localized high stresses.

[0007] Structural stability and durability issues: Traditional vibration isolation devices are prone to internal displacement or localized collisions under dynamic loads and temperature fluctuations, which can reduce the isolation effect and even cause equipment damage. Furthermore, the lack of effective protective measures can lead to fatigue and wear over long-term use.

[0008] It can be seen that the existing technology still has a lot of room for improvement in terms of vibration isolation frequency band expansion, energy dissipation mechanism and structural stability, which also provides a breakthrough for the proposal of new technical solutions. Summary of the Invention

[0009] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a directional maze particle damping mechanical metamaterial vibration isolation device. By combining the band gap characteristics of the periodic structure, the multi-refractive characteristics of the maze structure and the energy dissipation characteristics of the particle damping, the vibration isolation device can effectively isolate and reduce vibration and noise in a wide low-frequency range.

[0010] The purpose of the present invention is achieved through the following technical solutions:

[0011] A directional maze particle damping mechanical metamaterial vibration isolation device includes a protective housing, a self-lubricating plate, a vibration transmission device, a periodic maze group, and a flexible limit protection device; the protective housing includes an upper shell and a lower shell, the lower shell having two sides with a plurality of through holes in the vibration direction and two other sides with a plurality of threaded holes; the upper shell and the lower shell are connected by bolts; two self-lubricating plates are provided, respectively bonded to the lower surface of the upper shell and the upper surface of the lower shell;

[0012] The vibration transmission device is provided with two, which are symmetrically distributed on both sides of the protective shell, including a vibration-imparting plate, a vibration-averting block, a vibration-bearing plate, a stud, an outer splint, a cylindrical nut, a vibration rod compression spring, and an inner splint; the vibration-imparting plate is provided with a plurality of threaded holes for connecting an external vibration source; the vibration-imparting plate is connected to the vibration-averting block, and the vibration-averaging block is connected to the vibration-bearing plate; the stud passes through the through hole on the side of the lower shell, one end is connected to the vibration-bearing plate, and the other end is screwed with the cylindrical nut and connected to the outer splint; the vibration rod compression spring is sleeved on the cylindrical nut, one end contacts the side of the lower shell, and the other end contacts the outer splint; the outer splint and the inner splint clamp the periodic maze group by bolts;

[0013] The flexible limit protection device is provided with two, which are symmetrically arranged on both sides of the periodic maze group in the non-vibration source direction, including a self-lubricating baffle, an internal threaded pin, and a side compression spring; a plurality of cylindrical bosses are evenly arranged on one side of the self-lubricating baffle, and the other side surface is in contact with the side of the periodic maze group, and the upper and lower surfaces are in contact with the self-lubricating plate; one end of the internal threaded pin is fixed to the threaded hole of the lower shell by a set screw and a nut, and the other end is deep into the interior of the cylindrical boss; the side compression spring is sleeved on the outer wall of the cylindrical boss and is always in a compressed state, and its two ends are respectively in contact with the side of the lower shell and the self-lubricating baffle;

[0014] Furthermore, the periodic maze group includes maze blocks and spherical particle dampers; the maze blocks are periodically arranged and bonded into a whole. Since the overall structure is periodic, according to the Bragg scattering principle, the periodic maze group has a band gap characteristic, that is, it suppresses the transmission of elastic waves within the band gap frequency range; the upper surface and the lower surface are in contact with the self-lubricating plates respectively; the spherical particle dampers are arranged inside the maze grid, and the elastic wave energy is dissipated to achieve vibration reduction through friction and collision between the spherical particle dampers and between the spherical particle dampers and the maze blocks; the structural characteristics of the periodic maze group can increase the frequency of friction and collision between the spherical particle dampers and the maze blocks, improve the energy dissipation efficiency, and can cause the elastic waves to undergo multiple reflections and refractions in the maze blocks to enhance the interaction between the elastic waves and hinder the propagation of the elastic waves.

[0015] Furthermore, the upper shell is provided with four countersunk holes at the four rounded corners, which are coaxial with the four threaded through holes of the lower shell respectively. The upper end surface of the bolt connecting the upper shell and the lower shell is lower than the outer surface of the upper shell, so that the outer surface remains flat.

[0016] Furthermore, the through-hole surface of the lower shell is coated with self-lubricating material to reduce the friction between the lower shell and the double-headed stud rod part, reduce noise and extend service life; the vibration rod compression spring is used to prevent the periodic maze group from colliding with the lower shell and causing damage; the periodic maze group is restricted by a flexible limit protection device and remains near the central axis of the protective shell.

[0017] Furthermore, the height of the boss in the middle of the vibration imparting plate is consistent with the height of the bolt heads on both sides, thereby ensuring close contact between the external vibration source and the vibration imparting plate.

[0018] Furthermore, a through hole is provided at the center of the top surface of the vibration balancing block, and an inner curling groove is provided at the bottom, which facilitates adjustment of the relative position of the vibration balancing block and the vibration supporting plate to ensure that the elastic wave is evenly transmitted to both sides of the vibration supporting plate.

[0019] Furthermore, a plurality of threaded holes are provided at the horizontal midline of the outer plywood for connecting studs; a plurality of threaded holes are provided on the inner plywood located in the maze block, and corresponding connecting holes are provided on the outer plywood. The outer plywood and the inner plywood are connected by plywood bolts, and the plywood bolts do not penetrate the inner plywood.

[0020] Furthermore, the internal threaded pin maintains a distance from the bottom end of the cylindrical boss of the self-lubricating baffle to prevent the two from colliding during use of the flexible limit protection device.

[0021] Furthermore, effective vibration isolation can be performed above 60 Hz.

[0022] Furthermore, the protective shell is made of acrylic and is placed horizontally on a stable platform.

[0023] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0024] 1. The vibration-averaging block in the present invention has a hollow structure and has the advantage of lightweight structure. It is equipped with an inner curling groove, which significantly improves the bending stiffness compared with the plate, helps to evenly transmit elastic waves to the vibration-bearing plate, reduce energy loss, and improve the overall vibration reduction performance.

[0025] 2. In the present invention, the periodic labyrinth group is connected to the protective shell through a vibration rod compression spring to prevent the periodic labyrinth group from colliding with the protective shell and causing damage during use; the stud and the cylindrical nut thereon have a limiting function for the vibration rod compression spring, and work together with the flexible limiting protection device to ensure that the periodic labyrinth group is always consistent with the input direction of the elastic wave, thereby ensuring the vibration reduction effect.

[0026] 3. The periodic maze blocks and spherical particle damping in the periodic maze group of the present invention are periodically distributed, so that the structure can not only effectively reduce vibration within the band gap range, but also have excellent vibration isolation effect in the frequency range where some fluctuations and vibrations can pass through due to the dissipation effect of the spherical particle damping on the elastic waves and the multiple refraction of the elastic waves by the maze structure.

[0027] 4. The spherical particles in the present invention are distributed in a maze structure. As the complexity of the distribution path increases and the length is extended, the collision and friction frequency of the spherical particle damping and the transmission time of the elastic wave between the spherical particles are increased, thereby improving the energy dissipation capacity of the spherical particle damping.

[0028] 5. The flexible limit protection device in the present invention can provide a buffer when the lateral displacement of the periodic maze group is too large, effectively preventing collisions or local force concentration caused by lateral displacement, and preventing the vibration transmission device from squeezing the lower shell and causing damage to the device; compared with the rigid limit device, it has a high tolerance for lateral deformation of the periodic maze group due to temperature changes, load size, etc. during use; and because it is usually subjected to alternating loads, the flexible limit protection device can reduce friction and impact inside the component, thereby delaying material fatigue and extending the service life of the equipment.

[0029] 6. The present invention is a purely mechanical device and mostly uses standard parts. Compared with the electric control structure, it has the advantages of low cost, no electromagnetic interference and long service life.

[0030] 7. The present invention utilizes multiple vibration isolation mechanisms in synergy. By adopting a periodic maze group design, the maze blocks are arranged periodically to form a bandgap structure, and the Bragg scattering principle is used to effectively suppress the transmission of elastic waves within the bandgap. At the same time, the maze structure extends the propagation path of the elastic waves and induces multiple refractions, producing a damping effect both within the bandgap and in the frequency range where fluctuations and vibrations can pass, thereby achieving broadband vibration isolation.

[0031] 8. This invention achieves efficient energy dissipation. Leveraging the particle damping effect, spherical particles are distributed within the maze blocks. This significantly improves energy dissipation efficiency by increasing the frequency of friction and collisions between particles and between particles and blocks. The structural design allows elastic waves to propagate along complex paths, extending the propagation time and thereby more effectively converting vibration energy into heat for dissipation.

[0032] 9. In the present invention, the through holes of the lower shell are coated with self-lubricating material to reduce friction, and the surface of the spherical particle damper, the labyrinth block, and the contact surface of the inner clamping plate with the spherical particle damper are all sandblasted to increase the roughness of the contact surface and improve the energy dissipation performance of the spherical particle damper.

[0033] 10. The device of the present invention uses a vibration transmission device to distribute the elastic waves generated by the vibration source in multiple paths through the studs and evenly distribute them to the internal vibration reduction device, thereby fully utilizing the internal vibration reduction device to dissipate the elastic wave energy.

[0034] In summary, the present invention, through the organic combination of multiple vibration isolation mechanisms, not only achieves a significant vibration isolation effect in the frequency range above 60 Hz, but also has obvious advantages in energy dissipation, structural stability and durability, overcoming the shortcomings of the existing technology in terms of vibration isolation broadband, efficiency and long-term reliability.

[0035] Description of the attached figure

[0036] Figure 1 Schematic diagram of the perspective structure of the directional maze particle damping mechanical metamaterial vibration isolation device in an embodiment of the present invention.

[0037] Figure 2 Schematic diagram of the explosion structure of the directional maze particle damping mechanical metamaterial vibration isolation device in an embodiment of the present invention.

[0038] Figure 3 Schematic diagram of the explosion structure of the protective shell in an embodiment of the present invention.

[0039] Figure 4 Schematic diagram of the explosion structure from the vibration imparting plate to the vibration receiving plate in an embodiment of the present invention.

[0040] Figure 5 Schematic diagram of the cross-sectional structure of the vibration balancing block in an embodiment of the present invention.

[0041] Figure 6 Schematic diagram of the explosion structure from the vibration plate to the periodic maze group in an embodiment of the present invention.

[0042] Figure 7 It is a perspective structural diagram of the vibration plate to the periodic maze group in an embodiment of the present invention.

[0043] Figure 8 Schematic diagram of the explosion structure of the periodic maze group in an embodiment of the present invention.

[0044] Figure 9 Schematic diagram of the explosion structure of the flexible limiting protection device in an embodiment of the present invention.

[0045] Figure 10 Schematic diagram of the perspective structure of the flexible limiting protection device in an embodiment of the present invention.

[0046] Figure 11 This is a schematic top view of the internal structure of the directional maze particle damping mechanical metamaterial vibration isolation device in an embodiment of the present invention.

[0047] Figure 12 This is a graph showing the logarithmic ratio of the input response of the directional maze particle damping mechanical metamaterial vibration isolation device in an embodiment of the present invention.

[0048] Figure markings: 1-protective shell, 2-self-lubricating plate, 3-vibration transmission device, 4-periodic maze group, 5-flexible limit protection device, 10-shell bolt, 11-upper shell, 12-lower shell, 40-spherical particle damping, 41-maze block, 50-self-lubricating baffle, 51-side compression spring, 52-inner threaded pin, 53-setting screw, 54-flat washer, 55-nut 300-hexagonal nut, 301-spring washer, 302-flat washer, 303-vibration bearing plate, 304-hexagonal bolt, 305-vibration uniform block, 306-vibration imparting plate, 307-bolt, 308 stud, 309 cylindrical nut, 310-vibration rod compression spring, 311-outer splint, 312-inner splint, 313-splint circular washer, 314-splint spring washer, 315-splint bolt. DETAILED DESCRIPTION

[0049] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0050] The solution adopted by a directional maze particle damping mechanical metamaterial vibration isolation device in an embodiment of the present invention is:

[0051] An external vibration source is bolted to a vibration-inducing plate. The generated elastic waves are transmitted through a vibration transmission device into the periodic labyrinth group. The periodic labyrinth group achieves vibration isolation in three ways. First, the periodic distribution of the labyrinth blocks within the periodic labyrinth group creates a band gap characteristic, as determined by Bragg scattering theory. This rapidly attenuates elastic waves within the band gap, preventing them from propagating. Second, the spherical particle dampers distributed within the labyrinth blocks extend the path for elastic waves to propagate between the spherical particles. The tortuous path allows for more effective friction and collision between the spherical particle dampers and the labyrinth blocks, dissipating the energy of elastic waves of all frequencies and further enhancing the vibration reduction effect. Finally, the labyrinth structure design provides a high refractive index and excellent elastic wave absorption capabilities. After vibration reduction by the periodic labyrinth group, the elastic waves are output through the vibration transmission device on the opposite side. During operation, a flexible limiter keeps the periodic labyrinth group close to the device's central axis for optimal vibration reduction.

[0052] The directional maze particle damping mechanical metamaterial vibration isolation device provided by the embodiment of the present invention is as follows Figures 1 to 3 As shown, the device comprises a protective housing 1, a self-lubricating plate 2, a vibration transmission device 3, a periodic labyrinth assembly 4, and a flexible position limiting protective device 5. The protective housing 1 is positioned horizontally, with the four corners of the upper housing 11 and lower housing 12 connected by housing bolts 10. Two self-lubricating plates 2 are treated with sodium natrium and then bonded to the upper and lower surfaces of the upper and lower housings 11 and 12, respectively, using epoxy resin adhesive. The upper and lower surfaces of the periodic labyrinth assembly 4 contact the upper and lower self-lubricating plates, respectively. The lower housing 12 has 12 through-holes on both sides along the elastic wave input direction, through which the two vibration transmission devices 3 pass to connect to the periodic labyrinth assembly 4. Three threaded holes are provided on each of the remaining two sides, through which the two flexible position limiting protective devices 5 are secured to the lower housing 12 and in close contact with the periodic labyrinth assembly 4, ensuring that the periodic labyrinth assembly 4 is always positioned near the central axis of the vibration damping device. In this embodiment of the present invention, the upper and lower housings 11 and 12 are made of acrylic, the housing bolts 10 are made of stainless steel, and the self-lubricating plates 2 are made of PTFE (polytetrafluoroethylene).

[0053] like Figure 4 and Figure 5The diagram shows the connection structure between the vibration-imparting plate and the vibration-receiving plate. The vibration-imparting plate 306 has several threaded holes for connecting to an external vibration source and through-holes at both ends. The vibration-equalizing block 305 has a through-hole in the middle of its top and an internal curling groove at its bottom. The vibration-receiving plate 303 has several through-holes. The vibration-imparting plate 306, vibration-equalizing block 305, and vibration-receiving plate 303 are connected by a bolt 307, a flat washer 302, a spring washer 301, and a nut 300. The vibration-equalizing block 305 and vibration-receiving plate 303 are connected by two hexagonal bolts 304, four flat washers 302, two spring washers 301, and two nuts 300. The internal curling groove allows the vibration-equalizing block 305 to adjust its connection position with the vibration-receiving plate 303. In the embodiment of the present invention, the nut 300, spring washer 301, flat washer 302, hexagonal bolt 304 and bolt 307 are all made of stainless steel, and the vibration imparting plate 306, vibration balancing block 305 and vibration bearing plate 303 are made of ABS (acrylonitrile-butadiene-styrene copolymer).

[0054] like Figure 6 and Figure 7 The diagram shows the connection structure between the vibration plate and the periodic labyrinth assembly. The outer plate 311 has two threaded holes along its horizontal midline, two through-holes on either side, and two threaded holes along its horizontal midline. The vibration plate 303 is connected to the outer plate 311 via two studs 308. These studs 308 are connected to the vibration plate 303 via two nuts 300, a spring washer 301, and two flat washers 302. The plain studs extend through through-holes in the lower housing 41, which are coated with a self-lubricating material to reduce friction. The other end of the studs 308 is connected to the outer plate 311 via a threaded hole via a nut 300, a spring washer 301, and a flat washer 302. A compression spring 310 contacts the lower housing 41 at one end and the outer plate 311 at the other end, preventing damage from collision between the lower housing 41 and the outer plate 311. The cylindrical nut 309 is sleeved on the vibrating rod outside the stud 308 and is tightened at the bottom of the thread. The compression spring 310 is sleeved on the outside of the cylindrical nut 309 to prevent it from contacting the thread of the stud 308 and affecting its buffering performance.

[0055] The inner and outer plates 312 and 311 clamp the labyrinth block 41 together via two plate bolts 315, two plate spring washers 314, and two plate spring washers 313. The plate bolts 315 do not penetrate the inner plate 312, maintaining close contact with the spherical particles. In this embodiment of the present invention, the studs 308, cylindrical nuts 309, plate flat washers 313, plate spring washers 314, and plate bolts 315 are all made of stainless steel, the oscillator compression spring 310 is made of spring steel, and the outer and inner plates 311 and 312 are made of ABS.

[0056] like Figure 8The structure shown is a periodic labyrinth assembly. Labyrinth blocks 41 are periodically arranged within the lower housing 12 and bonded together using epoxy resin adhesive. This gives the periodic labyrinth assembly 4 a bandgap characteristic and a high refractive index for elastic waves. Spherical particle dampers 40 are filled within the labyrinth blocks 41, dissipating elastic wave energy. In this embodiment of the present invention, the spherical particle dampers 40 are made of stainless steel, while the labyrinth blocks 41 are made of ABS.

[0057] like Figures 9 to 11 The structure of the flexible limit protection device is shown. The self-lubricating baffle 50 is connected to the lower housing 12 via three side compression springs 51, three internally threaded pins 52, three set screws 53, three flat washers 54, and three nuts 55. One side of the self-lubricating baffle 50 is in close contact with the periodic labyrinth assembly 4. The other side is equipped with three cylindrical bosses, with the upper and lower flat surfaces contacting the self-lubricating plate 2. The side compression springs 51 fit over the outer sides of the cylindrical bosses and remain in a constant compression state. One end contacts the self-lubricating baffle 50, and the other end contacts the inner side wall of the lower housing 12, providing flexible support for the self-lubricating baffle 50. One end of the threaded hole of the internally threaded pin 52 is connected to the set screw 53 and secured to the through-hole of the lower housing 12 via a flat washer 54 and nut 55. The top end of the pin 52 extends into the cylindrical boss of the self-lubricating baffle 50, maintaining a certain distance from the bottom end to prevent contact. The combination of the internally threaded pin 52 and the cylindrical boss acts as a limiter for the side compression springs 51. In the embodiment of the present invention, the self-lubricating baffle 50 is made of PTFE, the side compression spring 51 is made of spring steel, and the internal threaded pin 52, the set screw 53, the flat washer 54 and the nut 55 are made of stainless steel.

[0058] The working principle of the directional maze particle damping mechanical metamaterial vibration isolation device of the above-mentioned invention embodiment includes:

[0059] The periodic maze group in this device is composed of maze blocks arranged periodically. According to the Bragg scattering mechanism, the energy of elastic waves within a specific frequency range is absorbed and scattered inside the material, making it difficult to propagate. The corresponding frequency range is called the Bragg band gap. The Bragg condition can determine the frequency position where the band gap appears, that is,

[0060]

[0061] Where a represents the lattice size of the periodic structure, and λ represents the wavelength of the elastic wave in the periodic structure.

[0062] Particle dampers utilize granular materials to absorb and dissipate elastic wave energy. In this device, the particles are filled within the maze blocks. When the periodic maze group vibrates, the spherical particles produce relative displacement, leading to collision and friction. This dissipates the elastic wave energy as heat, thereby achieving vibration reduction. Due to the complex relationship between the amplitude and frequency of the damping force in a particle damper, the device achieves excellent vibration reduction across a wide frequency range. By filling the maze structure with spherical particles, the device extends the path for elastic wave propagation and increases the probability of collision with the maze blocks, thereby enhancing the energy dissipation effect. The maze structure itself has a high refractive index and reflectivity, which enhances the interaction between elastic waves and hinders their propagation.

[0063] like Figure 12 The following figure shows the finite element results of elastic wave transmission in an embodiment of the present invention with and without spherical particle damping. Without spherical particle damping 41, the periodic labyrinth group 4 exhibits significant vibration isolation at frequencies between 60 Hz and 880 Hz due to its band gap characteristics and the high refractive index of the labyrinth structure. The addition of spherical particle damping enhances the vibration isolation performance of the vibration damping device from 60 Hz to 880 Hz, maintaining excellent isolation performance above 880 Hz.

[0064] In summary, compared to previous vibration isolation devices, the outstanding feature of the embodiments of the present invention is that the combination of labyrinth metamaterials and spherical particle damping can achieve significant vibration isolation effects at frequencies above 60 Hz. Furthermore, by introducing a flexible limit protection device, lateral support can be provided for the periodic labyrinth group, ensuring that it remains on the central axis of the isolation device during use, thus ensuring the vibration isolation effect. This device provides a stable, electromagnetically interference-free vibration isolation and noise reduction device for elastic wave working conditions of various frequencies.

[0065] The device and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of these modules may be selected based on actual needs to achieve the objectives of the present embodiments. Persons of ordinary skill in the art will be able to understand and implement the present embodiments without inventive effort.

[0066] It will be understood by those skilled in the art that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or couplings. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0067] The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention. The above specific embodiments are merely illustrative and not restrictive. Without departing from the scope of the present invention and the scope of protection of the claims, those skilled in the art may make various specific modifications based on the teachings of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A directional maze particle damping mechanical metamaterial vibration isolation device, characterized in that: The device comprises a protective housing, a self-lubricating plate, a vibration transmission device, a periodic labyrinth group, and a flexible limit protection device; the protective housing comprises an upper shell and a lower shell, the two sides of the lower shell having a plurality of through holes in the vibration direction and a plurality of threaded holes in the other two sides; the upper shell and the lower shell are connected by bolts; the self-lubricating plate is provided in two pieces, respectively bonded to the lower surface of the upper shell and the upper surface of the lower shell; The vibration transmission device is provided with two, which are symmetrically distributed on both sides of the protective shell, including a vibration-imparting plate, a vibration-averting block, a vibration-bearing plate, a stud, an outer splint, a cylindrical nut, a vibration rod compression spring, and an inner splint; the vibration-imparting plate is provided with a plurality of threaded holes for connecting an external vibration source; the vibration-imparting plate is connected to the vibration-averting block, and the vibration-averaging block is connected to the vibration-bearing plate; the stud passes through the through hole on the side of the lower shell, one end is connected to the vibration-bearing plate, and the other end is screwed with the cylindrical nut and connected to the outer splint; the vibration rod compression spring is sleeved on the cylindrical nut, one end contacts the side of the lower shell, and the other end contacts the outer splint; the outer splint and the inner splint clamp the periodic maze group by bolts; The flexible limit protection device is provided with two, which are symmetrically arranged on both sides of the periodic maze group in the non-vibration source direction, including a self-lubricating baffle, an internal threaded pin, and a side compression spring; a plurality of cylindrical bosses are evenly arranged on one side of the self-lubricating baffle, and the other side surface is in contact with the side of the periodic maze group, and the upper and lower surfaces are in contact with the self-lubricating plate; one end of the internal threaded pin is fixed to the threaded hole of the lower shell by a set screw and a nut, and the other end is deep into the interior of the cylindrical boss; the side compression spring is sleeved on the outer wall of the cylindrical boss and is always in a compressed state, and its two ends are respectively in contact with the side of the lower shell and the self-lubricating baffle; The periodic maze group includes maze blocks and spherical particle damping; the maze blocks are periodically arranged and bonded into a whole. Since the overall structure has periodicity, according to the Bragg scattering principle, the periodic maze group has a band gap characteristic; The spherical particle dampers are arranged inside the maze grid, and elastic wave energy is dissipated to achieve vibration reduction through friction and collision between the spherical particle dampers and between the spherical particle dampers and the maze blocks.

2. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The periodic labyrinth group can suppress the transmission of elastic waves within the band gap frequency range, and the upper surface and the lower surface are in contact with the self-lubricating plate respectively; the structural characteristics of the periodic labyrinth group can increase the frequency of friction and collision between the spherical particle damping and the labyrinth blocks, improve the energy dissipation efficiency, and enable the elastic waves to undergo multiple reflections and refractions within the labyrinth blocks to enhance the interaction between the elastic waves and hinder the propagation of the elastic waves.

3. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The upper shell is provided with four countersunk holes at the four rounded corners, which are coaxial with the four threaded through holes of the lower shell respectively. The upper end surface of the bolt connecting the upper shell and the lower shell is lower than the outer surface of the upper shell, so that the outer surface remains flat.

4. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The through-hole surface of the lower shell is coated with self-lubricating material to reduce the friction between the lower shell and the polished rod part of the stud, reduce noise and extend service life; the vibration rod compression spring is used to prevent the periodic maze group from colliding with the lower shell and causing damage; the periodic maze group is restricted by a flexible limit protection device and remains near the central axis of the protective shell.

5. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The height of the boss in the middle of the vibration imparting plate is consistent with the height of the bolt heads on both sides, ensuring close contact between the external vibration source and the vibration imparting plate.

6. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: A through hole is provided at the center of the top surface of the vibration balancing block, and an inner curling groove is provided at the bottom, which facilitates adjustment of the relative position of the vibration balancing block and the vibration supporting plate to ensure that the elastic wave is evenly transmitted to both sides of the vibration supporting plate.

7. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 2, characterized in that: The outer plywood is provided with several threaded holes at the horizontal midline for connecting studs; the inner plywood located in the maze block is provided with several threaded holes, and the outer plywood is provided with corresponding connecting holes. The outer plywood and the inner plywood are connected by plywood bolts, and the plywood bolts do not penetrate the inner plywood.

8. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The internal thread pin maintains a distance from the bottom end of the cylindrical boss of the self-lubricating baffle to prevent the two from colliding during use of the flexible limit protection device.

9. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: Capable of effective vibration isolation above 60Hz.

10. The directional maze particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The protective shell is made of acrylic and is placed horizontally on a stable platform.

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