Directional labyrinth particle damping mechanical metamaterial vibration isolation device

Abstract

The invention discloses a directional labyrinth particle damping mechanical metamaterial vibration isolation device which comprises a protective shell, a self-lubricating plate, a vibration transmission device, a periodic labyrinth set and a flexible limiting protection device. The protective shell comprises an upper shell and a lower shell; the vibration transmission device comprises a vibration excitation plate, a vibration uniformizing block, a vibration bearing plate, a double-end stud, an outer clamping plate, a cylindrical nut, a vibration rod pressure spring and an inner clamping plate; the periodic maze group comprises maze blocks and spherical particle dampers, the maze blocks are periodically arranged and bonded into a whole, and the spherical particle dampers are arranged in maze cells; the flexible limiting protection device comprises a self-lubricating baffle plate, an internal thread pin and a side pressure spring; the self-lubricating plate is adhered to the interiors of the upper shell and the lower shell and is in contact with the upper and lower surfaces of the periodic labyrinth group; the vibration transmission devices are symmetrically distributed on the two sides of the protection shell in the vibration source direction and are connected with the periodic labyrinth set and an external vibration source. The flexible limiting protection devices are symmetrically arranged on the two sides of the non-vibration-source direction of the periodic labyrinth set, so that the flexible limiting protection devices are always located nearby the central axis of the vibration reduction device.

Description

Technical Field

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

[0002] Artificial elastic wave metamaterials are a type of composite materials or composite structures with microstructures as basic structural units, which have mechanical properties that natural materials do not have. Because of the rich degrees of freedom in the design and regulation of its dynamic performance, it has attracted widespread attention in the engineering field. Adjusting the structural parameters and periodic parameters of elastic wave metamaterials by design so that their band gap range is placed within the required frequency band is an effective vibration isolation method. In recent years, with the rapid development of relevant basic theories and the advancement of advanced manufacturing technologies such as 3D printing, it has shown broad application prospects in vibration and noise reduction in engineering construction, mechanical manufacturing, and aerospace fields. Unlike conventional elastic wave metamaterials that reduce vibration through higher elastic wave losses, labyrinth metamaterials achieve the effect of vibration and noise reduction by extending the propagation path of elastic waves and enhancing the interaction between elastic waves to hinder propagation.

[0003] Particle damping technology is to place granular materials into the structure at a certain filling rate, and consume the vibration energy of the system through the collision and friction between particles during the structural vibration process to achieve 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 chamber. By optimizing these parameters, the energy dissipation efficiency of the particle damper can be improved, thereby improving the vibration reduction effect. Particle dampers have been widely studied and applied due to their low cost, long service life, and good vibration and noise reduction effects.

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

[0005] Limitation of vibration isolation frequency band: Traditional metamaterials mainly rely on designing periodic structures to achieve the bandgap effect, thereby suppressing elastic wave transmission within a specific frequency range. However, this method is often limited to the bandgap frequency band, and the vibration isolation effect for wide frequency bands (especially above 60Hz) is not ideal, and it is difficult to meet the vibration reduction requirements under complex working conditions.

[0006] Insufficient energy dissipation efficiency: Although the existing particle damping technology has a simple structure and low cost, the energy dissipation mainly relies on the limited friction and collision between particles and between particles and walls. It is difficult to achieve sufficient collision frequency and friction, resulting in low elastic wave energy dissipation efficiency. At the same time, there is a lack of reasonable coupling design between particles and structures, which makes the vibration energy transmission uneven and the local high stress phenomenon obvious.

[0007] Structural stability and durability issues: Traditional vibration isolation devices are prone to positional displacement or local collisions in the periodic structure under dynamic loads and temperature changes, which reduces the vibration isolation effect and even causes equipment damage. In addition, the lack of effective protective measures makes fatigue and wear problems more likely to occur during 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 deficiencies in the prior art and to provide a directional maze particle damping mechanical metamaterial vibration isolation device, which combines 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, so that the vibration isolation device can effectively isolate and reduce vibration and noise in a wide low-frequency range.

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

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

[0012] The vibration transmission devices are provided with two, symmetrically distributed on both sides of the protective shell, including a vibration imparting plate, a vibration balancing block, a vibration bearing plate, a stud, an outer clamping plate, a cylindrical nut, a vibration rod compression spring, and an inner clamping plate; 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 balancing block, and the vibration balancing block is connected to the vibration bearing plate; the stud passes through the through hole on the side of the lower shell, one end of which is connected to the vibration bearing plate, and the other end is screwed with the cylindrical nut and connected to the outer clamping plate; the vibration rod compression spring is sleeved on the cylindrical nut, one end of which is in contact with the side of the lower shell, and the other end is in contact with the outer clamping plate; the outer clamping plate and the inner clamping plate 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 non-vibration source direction of the periodic labyrinth group, 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 labyrinth 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 penetrates into the inside 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 the 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 damping; the maze blocks are periodically arranged and bonded as 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 respectively in contact with the self-lubricating plate; the spherical particle damping is arranged inside the maze grid, and the friction and collision between the spherical particle damping and between the spherical particle damping and the maze blocks are used to dissipate the elastic wave energy to achieve vibration reduction; the structural characteristics of the periodic maze group can increase the frequency of friction and collision between the spherical particle damping and the maze blocks, improve the energy dissipation efficiency, and can cause the elastic waves to be reflected and refracted multiple times 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 four rounded corners, which are coaxial with the four threaded through holes of the lower shell respectively, and 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 smooth rod part of the double-headed stud, reduce noise and extend the 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 the flexible limit protection device and maintained 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-averaging block, and an inner curling groove is provided at the bottom, so as to facilitate adjustment of the relative position of the vibration-averaging block and the vibration-bearing plate to ensure that the elastic wave is evenly transmitted to both sides of the vibration-bearing plate.

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

[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 is a hollow structure, which has the advantage of lightweight structure; it is provided with an inner curling groove, and the bending stiffness is significantly improved compared with the plate, which helps to evenly transmit the elastic wave 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 by a vibration rod compression spring to prevent the periodic labyrinth group from colliding with the protective shell and causing damage during use; the double-headed stud and the cylindrical nut thereon have a limiting function for the vibration rod compression spring, and cooperate with the flexible limiting protection device to ensure that the periodic labyrinth group always remains consistent with the input direction of the elastic wave, thereby ensuring the vibration reduction effect.

[0026] 3. The labyrinth blocks of the periodic labyrinth group and the spherical particle damping in the present invention are distributed periodically, 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 through the dissipation effect of the spherical particle damping on the elastic waves and the multiple refractions of the elastic waves by the labyrinth 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 buffering when the lateral displacement of the periodic maze group is too large, effectively preventing collision 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 adopts the synergistic effect of multiple vibration isolation mechanisms. By adopting the design of a periodic maze group, the maze blocks are arranged periodically to form a band gap structure, and the Bragg scattering principle is used to effectively suppress the transmission of elastic waves in the band gap; at the same time, the maze structure extends the propagation path of the elastic wave and induces multiple refractions, which produces a damping effect both in the band gap and in the frequency range where waves and vibrations can pass, thereby achieving wide-band vibration isolation.

[0031] 8. The present invention can achieve efficient energy dissipation. Based on the particle damping effect, spherical particles are distributed inside the maze block. By increasing the friction and collision frequency between particles and between particles and maze blocks, the energy dissipation efficiency is greatly improved. The structural design allows elastic waves to propagate in a complex path, prolonging the transmission time, thereby more fully converting vibration energy into heat energy 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 surface where the inner clamping plate contacts 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 studs and evenly distribute them to the internal vibration reduction device, thereby making full use of 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 prior art in terms of vibration isolation broadband, efficiency and long-term reliability.

[0035] Attached picture says

[0036] Figure 1 It is a perspective structural schematic diagram of the directional maze particle damping mechanical metamaterial vibration isolation device in an embodiment of the present invention.

[0037] Figure 2 It is a 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 It is a schematic diagram of the explosion structure of the protective shell in an embodiment of the present invention.

[0039] Figure 4 It is a 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 It is a 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 a vibration bearing plate to a 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] Fig. 9 Schematic diagram of the explosion structure of the flexible limit protection device in an embodiment of the present invention.

[0045] Fig.10 It is a perspective structural diagram of a flexible limiting protection device in an embodiment of the present invention.

[0046] Fig.11 It is a schematic diagram of the 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] Fig.12 It is a graph of 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 labyrinth group, 5-flexible limit protection device, 10-shell bolt, 11-upper shell, 12-lower shell, 40-spherical particle damping, 41-labyrinth 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 round 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 cannot be interpreted 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] The external vibration source is connected to the vibration imparting plate by bolts, and the elastic waves generated are transmitted to the periodic labyrinth group through the vibration transmission device. The periodic labyrinth group can achieve the purpose of vibration isolation in three ways. First, the labyrinth blocks in the periodic labyrinth group are distributed periodically. According to the Bragg scattering law, the structure has a band gap characteristic, which can make the elastic waves in the band gap range decay rapidly and unable to propagate. Secondly, the spherical particle damping is distributed in the labyrinth blocks, and the path of elastic waves propagating between spherical particles is extended. Due to the tortuosity of the path, the spherical particle damping and the labyrinth blocks can have more sufficient friction and collision, thereby dissipating the energy of elastic waves of any frequency and further enhancing the vibration reduction effect. Finally, the design of the labyrinth structure makes the structure have a high refractive index and excellent absorption and loss capacity for elastic waves. The elastic waves after the vibration reduction treatment of the periodic labyrinth group are output through the vibration transmission device on the opposite side. During the use of the vibration reduction device, the flexible limit protection device keeps the periodic labyrinth group near the central axis of the device to achieve the best vibration reduction effect.

[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, it includes a protective shell 1, a self-lubricating plate 2, a vibration transmission device 3, a periodic labyrinth group 4, and a flexible limit protection device 5. The protective shell 1 is placed horizontally, and the four corners of the upper shell 11 and the lower shell 12 are connected by shell bolts 10. The two self-lubricating plates 2 are respectively bonded and fixed to the upper surface of the upper shell 11 and the lower surface of the lower shell 12 by epoxy resin glue after being treated with naphthalene. The upper surface and lower surface of the periodic labyrinth group 4 are respectively in contact with the upper and lower self-lubricating plates. The lower shell 12 is provided with 12 through holes on both sides along the input direction of the elastic wave, and the two vibration transmission devices 3 are connected to the periodic labyrinth group 4 through the through holes; the other two sides are each provided with 3 threaded holes, and the two flexible limit protection devices 5 are fixed to the lower shell 12 through the threaded holes and are in close contact with the periodic labyrinth group 4, so that the periodic labyrinth group 4 is always located near the central axis of the vibration reduction device. In the embodiment of the present invention, the upper shell 11 and the lower shell 12 are made of acrylic material, the shell bolts 10 are made of stainless steel, and the self-lubricating plate 2 is made of PTFE (polytetrafluoroethylene).

[0053] like Figure 4 and Figure 5The figure shows the connection structure of the vibration imparting plate to the vibration bearing plate. The vibration imparting plate 306 is provided with several threaded holes for connecting the external vibration source, and through holes are provided at both ends. The vibration balancing block 305 is provided with a through hole in the middle of the top, and an inner curling groove is provided at the bottom. The vibration bearing plate 303 is provided with several through holes. The vibration imparting plate 306, the vibration balancing block 305, and the vibration bearing plate 303 are connected by a bolt 307, a flat washer 302, a spring washer 301, and a nut 300. The vibration balancing block 305 and the vibration bearing plate 303 are connected by two hexagonal bolts 304, four flat washers 302, two spring washers 301, and two nuts 300. The vibration balancing block 305 can adjust the connection position with the vibration bearing plate 303 through the inner curling groove. 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 figure shows the connection structure of the vibration plate to the periodic labyrinth group. The outer clamping plate 311 is provided with two threaded holes at the horizontal center line, two through holes are provided at the upper sides, and two threaded holes are provided at the horizontal center line of the inner clamping plate. The vibration plate 303 is connected to the outer clamping plate 311 through two studs 308. The studs 308 are connected to the vibration plate 303 through two nuts 300, one spring washer 301, and two flat washers 302. The bare rod part of the studs passes through the through hole of the lower shell 41, and the through hole is coated with self-lubricating material to reduce friction. The other end of the studs 308 is connected to the outer clamping plate 311 through a threaded hole through a nut 300, a spring washer 301, and a flat washer 302. One end of the compression spring 310 contacts the lower shell 41, and the other end contacts the outer clamping plate 311 to prevent the lower shell 41 from colliding with the outer clamping plate 311 and causing damage. 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 clamping plate 312 and the outer clamping plate 311 clamp the labyrinth block 41 through two clamping plate bolts 315, two clamping plate spring washers 314 and two clamping plate spring washers 313. The clamping plate bolts 315 do not penetrate the inner clamping plate 312 so that it is in close contact with the spherical particles. In the embodiment of the present invention, the stud 308, the cylindrical nut 309, the clamping plate flat washer 313, the clamping plate spring washer 314, and the clamping plate bolts 315 are all made of stainless steel, the vibration rod compression spring 310 is made of spring steel, and the outer clamping plate 311 and the inner clamping plate 312 are made of ABS.

[0056] like Figure 8The structure of the periodic labyrinth group is shown in FIG. The labyrinth blocks 41 are periodically arranged inside the lower shell 12 and bonded as a whole by epoxy resin adhesive, so that the periodic labyrinth group 4 has a band gap characteristic and a high refractive index for elastic waves. The spherical particle damper 40 is filled inside the labyrinth block 41 so that the structure has a dissipative effect on the elastic wave energy. In the embodiment of the present invention, the spherical particle damper 40 is made of stainless steel, and the labyrinth block 41 is made of ABS.

[0057] like Figures 9 to 11 The structure of the flexible limit protection device is shown in the figure. The self-lubricating baffle 50 is connected to the lower shell 12 through three side compression springs 51, three internal thread pins 52, three set screws 53, three flat washers 54 and three nuts 55. One side of the plane of the self-lubricating baffle 50 is in close contact with the periodic labyrinth group 4, and the other side is provided with three cylindrical bosses, and the upper and lower planes are in contact with the self-lubricating plate 2. The side compression spring 51 is sleeved on the outer side of the cylindrical boss and is always in a compressed state. One end contacts the self-lubricating baffle 50, and the other end contacts the inner wall of the side of the lower shell 12, providing flexible support for the self-lubricating baffle 50. One end of the threaded hole of the internal thread pin 52 is connected to the set screw 53 and fixed to the through hole of the lower shell 12 through a flat washer 54 and a nut 55. The top end penetrates into the cylindrical boss of the self-lubricating baffle 50 and keeps a certain distance from its bottom end to avoid contact. The combination of the internal thread pin 52 and the cylindrical boss has a limiting effect on the side compression spring 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 a 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] The particle damper uses granular media to absorb and dissipate elastic wave energy. In this device, the particle dampers are filled in the maze blocks. When the periodic maze group vibrates, relative displacement will occur between the spherical particle dampers, and then collision and friction will occur, so that the elastic wave energy is dissipated in the form of heat energy, thereby achieving vibration reduction. Due to the complex relationship between the amplitude and frequency of the damping force in the particle damper, the device has a good vibration reduction effect in a wide frequency range. By filling the maze structure with spherical particles, this device extends the path of elastic wave propagation and increases the probability of collision with the maze blocks, thereby enhancing the energy dissipation effect on the elastic wave. The maze structure itself has a high refractive index and reflectivity, which can enhance the interaction between elastic waves and hinder their propagation.

[0063] like Fig.12 The finite element results of elastic wave transmission in the embodiment of the present invention with and without spherical particle damping are shown. Without spherical particle damping 41, the periodic labyrinth group 4 has an obvious vibration isolation effect at 60Hz to 880Hz due to the band gap characteristics and the high refractive index of the labyrinth structure. By adding spherical particle damping, the vibration isolation effect of the vibration reduction device at 60Hz to 880Hz is enhanced, and it also has an excellent vibration isolation effect above 880Hz.

[0064] In summary, compared with the previous vibration isolation devices, the outstanding feature of the embodiments of the present invention is that the maze metamaterial is combined with spherical particle damping, which can have a significant vibration isolation effect for frequencies above 60 Hz. At the same time, by introducing a flexible limit protection device, lateral support can be provided for the periodic maze group, so that it is always located on the central axis of the vibration isolation device during use, ensuring the vibration isolation effect. The device can provide a vibration isolation and noise reduction device with stable effect and no electromagnetic interference for elastic wave working conditions of various frequencies.

[0065] The device and system embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0066] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification 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, the "connection" or "coupling" used herein may include wireless connection or coupling. 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 solution 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, a person of ordinary skill in the art can also make many forms of specific changes under the guidance of the present invention, which all 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: It includes a protective shell, a self-lubricating plate, a vibration transmission device, a periodic labyrinth group and a flexible limit protection device; the protective shell includes an upper shell and a lower shell, and the two sides of the lower shell in the vibration direction are provided with a plurality of through holes, and the other two sides are provided with a plurality of threaded holes; the upper shell and the lower shell are connected by bolts; the self-lubricating plates are provided with two pieces, which are respectively bonded to the lower surface of the upper shell and the upper surface of the lower shell; The vibration transmission devices are provided with two, symmetrically distributed on both sides of the protective shell, including a vibration imparting plate, a vibration balancing block, a vibration bearing plate, a stud, an outer clamping plate, a cylindrical nut, a vibration rod compression spring, and an inner clamping plate; 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 balancing block, and the vibration balancing block is connected to the vibration bearing plate; the stud passes through the through hole on the side of the lower shell, one end of which is connected to the vibration bearing plate, and the other end is screwed with the cylindrical nut and connected to the outer clamping plate; the vibration rod compression spring is sleeved on the cylindrical nut, one end of which is in contact with the side of the lower shell, and the other end is in contact with the outer clamping plate; the outer clamping plate and the inner clamping plate clamp the periodic maze group by bolts; There are two flexible limit protection devices, which are symmetrically arranged on both sides of the non-vibration source direction of the periodic maze group, 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 penetrates 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 the two ends are respectively in contact with the side of the lower shell and the self-lubricating baffle.

2. According to claim 1, the directional maze particle damping mechanical metamaterial vibration isolation device is characterized in that: The periodic maze group includes maze blocks and spherical particle damping; the maze blocks are periodically arranged and bonded as 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 plate respectively; the spherical particle damping is arranged inside the maze grid, and the friction and collision between the spherical particle damping and between the spherical particle damping and the maze blocks are used to dissipate the energy of the elastic waves to achieve vibration reduction; the structural characteristics of the periodic maze group can increase the frequency of friction and collision between the spherical particle damping and the maze blocks, improve the energy dissipation efficiency, and can cause the elastic waves to be reflected and refracted multiple times in the maze 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 is characterized in that: The upper shell is provided with four countersunk holes at 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. According to claim 1, the directional maze particle damping mechanical metamaterial vibration isolation device is 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 smooth rod part of the stud, reduce noise and extend the 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 is 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, thereby 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-averaging block, and an inner curling groove is provided at the bottom, so as to facilitate adjustment of the relative position of the vibration-averaging block and the vibration-bearing plate to ensure that the elastic wave is evenly transmitted to both sides of the vibration-bearing plate.

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

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 the 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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