Star-shaped particle damping mechanical metamaterial vibration isolation device

Abstract

The invention discloses a star-shaped particle damping mechanical metamaterial vibration isolation device which comprises a protective shell, a vibration transmission device, a self-lubricating plate and an internal vibration reduction device. The protective shell is composed of an upper protective shell body and a lower protective shell body. The two vibration transmission devices are arranged on the two sides of the protection shell and each comprise a bearing plate, a force transmission plate, a sliding rod and a compressed spring. The sliding rod penetrates through the two ends of the through hole of the protective shell to be connected with the force transmission plate and the internal damping device. The two self-lubricating plates are fixed to the inner surfaces of the upper protective shell and the lower protective shell correspondingly. The vibration reduction device is composed of a vibration reduction outer frame, a cross clamping block, a quadrangular star clamping block and a spherical particle damper, and the vibration reduction outer frame comprises a vibration reduction baffle, an arc-shaped pressing device and a right-angle pressing device; the cross-shaped clamping block comprises a cross-shaped frame and a right-angle pressing device, the cross-shaped clamping block and the quadrilateral star clamping block are periodically arranged on the inner side of the vibration reduction outer frame, and the spherical particle dampers are arranged among the vibration reduction outer frame, the self-lubricating plate, the cross-shaped clamping block and the quadrilateral star clamping block and are pressed through the arc-shaped pressing device and the right-angle pressing device.

Description

Technical Field

[0001] The invention relates to the technical field of artificial elastic wave metamaterials, and in particular to a particle damping dispersed particle elastic wave metamaterial vibration isolation device with multi-directional synergistic effects. Background Art

[0002] Mechanical metamaterials refer to artificial composite structures with periodic characteristics. In recent years, they have been widely used in engineering due to their high strength and light weight. By designing the structural parameters of mechanical metamaterials, their band gap range is adjusted to the frequency range of the vibration source, so that vibration cannot propagate inside the metamaterial, thereby achieving vibration isolation and noise reduction. Researchers from various countries have conducted a lot of research on the band gap characteristics of mechanical metamaterials, and applied them to vibration problems and control technologies in rockets, ships, aircraft, etc.

[0003] Compared with traditional structures, star-shaped superstructures have a "tensile expansion" effect, that is, they expand when stretched and contract when compressed, which makes the star-shaped structure have higher shear strength, indentation resistance and excellent ability to dissipate vibration and impact energy. In addition, the star-shaped structure can also be reasonably expanded to various geometric shapes such as plates and shells through optimized design to cope with different working conditions, and is widely used in vibration isolation and noise reduction projects.

[0004] Vibration reduction and isolation through damping is the best way to suppress structural resonance and reduce structural noise. Particle dampers fill the structural cavity with particles to dampen the particles, so that when the structure vibrates, the internal particles collide and rub against each other to consume part of the vibration energy, thereby achieving vibration reduction and isolation. Particle dampers have a wide operating frequency band, good vibration reduction effect, and a wide range of application scenarios. They are widely used in the fields of aerospace and mechanical vibration control.

[0005] The demand for vibration control in the current engineering field is growing, and traditional vibration isolation technologies mainly rely on elastic materials, dampers or resonance absorbers. However, these technical solutions have many limitations. For example, although the elastic material vibration isolator has a simple structure, its absorption capacity for high-frequency vibration is limited, and it is difficult to provide effective vibration reduction effects in a wide frequency range; traditional dampers rely on viscoelastic materials or fluids to dissipate vibration energy, which is easily affected by changes in ambient temperature, resulting in unstable damping performance; although the resonance absorber can provide good vibration reduction effects for specific frequency points, its tuning range is narrow and its adaptability to working conditions with large frequency changes is poor.

[0006] In addition, existing vibration isolation devices usually have the problems of high structural stiffness and limited energy absorption capacity, and cannot effectively cope with sudden impact loads. Although some mechanical metamaterial vibration isolation devices based on periodic structures have band gap characteristics and can suppress elastic wave propagation within a specific frequency range, the vibration reduction effect in the low-frequency range is still limited. At the same time, the existing particle damper is limited by the random distribution of particles, and its energy dissipation capacity is difficult to predict and optimize, and its application in vibration isolation devices is unstable. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a star-shaped particle damping mechanical metamaterial vibration isolation device, which achieves vibration isolation in a low-frequency, wide-bandgap range by utilizing the bandgap characteristics of mechanical metamaterials, the energy absorption characteristics of star-shaped structures, and the energy dissipation characteristics of particle damping, and can meet the problem of vibration reduction and noise reduction under higher support strength.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A star-shaped particle damping mechanical metamaterial vibration isolation device, comprising a protective shell, a vibration transmission device, a self-lubricating plate, and an internal vibration reduction device: the protective shell is a square prism shell, comprising an upper protective shell and a lower protective shell, the four corners of the upper protective shell and the lower protective shell are provided with connection holes and connected by bolts, and the lower protective shell is provided with a plurality of circular through holes along the side of the square;

[0010] The vibration transmission devices are provided with two, which are arranged on both sides of the protective shell, including a bearing plate, a force transmission plate, a sliding rod and a compression spring. The bearing plate and the force transmission plate are provided with a plurality of through holes, and the external vibration source and the bearing plate, and the bearing plate and the force transmission plate are connected by bolts; both ends of the sliding rod are provided with threads, one end passes through the through hole of the protective shell and is connected to the force transmission plate through a nut and a gasket, and the other end is connected to the internal vibration reduction device through a thread; the compression spring is installed on the sliding rod, one end of which contacts the inner wall of the protective shell, and the other end contacts the internal vibration reduction device;

[0011] The self-lubricating plates are provided with two, which are respectively fixed to the inner surfaces of the upper and lower protective outer shells to reduce friction;

[0012] The internal vibration damping device is composed of a vibration damping external frame, a cross block, a four-pointed star block and a spherical particle damper. The vibration damping external frame includes a vibration damping baffle, an arc-shaped clamp and a right-angle clamp. The four sides of the vibration damping external frame are provided with a plurality of threaded holes. In the vibration transmission direction of the vibration transmission device, the sliding rod passes through the threaded holes and is connected to the arc-shaped clamp, and the threaded holes on the other two sides of the vibration damping external frame are connected to the arc-shaped clamp by bolts; the cross block includes a cross frame and a right-angle clamp, and the cross frame and the right-angle clamp are connected by bolts; the cross block and the four-pointed star block are periodically arranged on the inner side of the vibration damping external frame, and the spherical particle damper is arranged in the space formed by the vibration damping external frame, the self-lubricating plate, the cross block and the star block and is clamped by the arc-shaped and right-angle clamps.

[0013] Furthermore, the compression spring is longer than the distance between the side of the lower protective shell and the internal vibration reduction device, so that the compression spring is in a compressed state, providing a buffer for the protective shell and the internal vibration reduction device.

[0014] Furthermore, the smooth rod portion of the sliding rod passes through the through hole of the protective shell, and the interior of the through hole is coated with a self-lubricating material to reduce wear of the sliding rod.

[0015] Furthermore, the cross blocks and the four-pointed star blocks in the internal vibration reduction device are arranged alternately and periodically, and have the characteristics of a Bragg scattering band gap. Vibrations decay rapidly in the band gap and cannot propagate. However, within the frequency range through which waves and vibrations can pass, due to the presence of the spherical particle damping and the overall star-shaped structure, vibration energy is dissipated to achieve vibration reduction.

[0016] Furthermore, the arc-shaped presser and the right-angle presser squeeze the spherical particle damper through the studs or the flat-end set screws so that the spherical particle damper is closely arranged in the internal vibration reduction device.

[0017] Furthermore, the protective shell is made of acrylic and is stably placed on a horizontal platform, and the vibration transmission device, the self-lubricating plate, and the internal vibration reduction device are all kept parallel to the horizontal planes of the upper protective shell and the lower protective shell.

[0018] Furthermore, the bearing surface of the bearing plate is higher than the upper end surface of the screw, so that the bearing plate can be in close contact with the vibration source, and the lower protective outer shell connecting hole is a countersunk hole, which is used to make the screw end surface located inside the lower protective outer shell to ensure the flatness of the installation plane.

[0019] Furthermore, the through holes on the bearing plate are coaxial with part of the through holes on the force transmission plate and are used for connecting to an external vibration source.

[0020] Furthermore, the internal vibration reduction device has the best vibration reduction effect when the external excitation frequency is in the range of 20 to 170 Hz, 180 to 430 Hz and above 450 Hz.

[0021] Furthermore, the internal vibration reduction device has a negative Poisson's ratio characteristic and has the ability to resist impact loads; and the axis of the sliding rod is maintained on a horizontal plane.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0023] 1. Wide-band vibration isolation effect: It has a periodic structure and band gap effect. The cross blocks and star blocks in the internal vibration reduction device are arranged alternately and periodically. Based on the Bragg scattering principle, a clear band gap is formed, which effectively blocks the propagation of elastic waves in the frequency bands of 20-170Hz, 180-430Hz and above 450Hz. Through particle damping energy dissipation, outside the band gap, due to the collision and friction between particles and between the blocks and the outer frame, the spherical particle damping converts the remaining vibration energy into heat energy, further expanding the vibration isolation frequency band.

[0024] 2. Excellent energy absorption and impact resistance: With a negative Poisson's ratio star structure, the star structure exhibits "tension and expansion" characteristics under vibration and impact loads, which can quickly absorb and disperse energy, and improve the overall system's impact resistance and energy dissipation capabilities. It has multi-directional synergy, and the internal components work together in different directions to achieve multiple absorption and attenuation of vibration energy, ensuring that the vibration isolation effect remains stable under complex working conditions.

[0025] 3. Improved structural safety and stability: The flexible connection design is used to protect the outer shell and the internal vibration reduction device through a compression spring, which can effectively buffer the impact and prevent damage caused by collision. The deformation path of the compression spring is limited by the sliding rod to ensure that the internal structure is stable during operation and maintain the best vibration isolation performance. The compression device is optimized, and the arc-shaped compression device and the right-angle compression device adopt a two-way extrusion solution to arrange the spherical particle damping tightly inside, ensuring that the particles are fully in contact with the block and the outer frame, thereby improving the pushing and energy dissipation effects.

[0026] 4. Simple manufacturing and cost advantage: Most components are made of national standard parts, with mature processing technology, high reliability and low manufacturing cost. At the same time, due to the pure mechanical structure design, there is no electromagnetic interference and it is suitable for a variety of application scenarios. The internal vibration reduction device can flexibly match the requirements of different working conditions by adjusting the number of blocks and the amount of particle filling, making the vibration isolation device have a wide range of applicability and good engineering application prospects.

[0027] 5. The device of the present invention adopts a vibration transmission device to distribute the elastic waves generated by the vibration source into multiple paths through sliding rods and evenly distribute them to the internal vibration reduction device. This process realizes the transformation from a single-point vibration source to a multi-point vibration source. While making full use of the internal vibration reduction device to dissipate the elastic wave energy, it also avoids damage to a single sliding rod caused by excessive load.

[0028] 6. The screw head of the right-angle clamp is ground flat to increase the contact area with the right-angle clamp, avoid relative displacement during vibration, and maintain stability. In addition, a groove is set on the pressure side of the right-angle clamp to facilitate the pushing position of the flat-end set screw to be located near the middle surface to ensure the pushing effect.

[0029] 7. In the present invention, the through holes of the lower protective shell are coated with self-lubricating material to reduce friction, and the surfaces of the spherical particle damper, the arc-shaped clamp, the right-angle clamp, the star-shaped clamp, the cross-shaped clamp, and the surface where the vibration-damping external frame contacts the spherical particle damper are all sandblasted to increase the roughness of the contact surface and improve the energy consumption performance of the spherical particle damper.

[0030] 8. In the present invention, the star-shaped clamping block and the cross clamping block are non-rigidly fixed in the vibration reduction device, and a clamping block of a suitable size can be selected according to actual working conditions, which has the advantage of flexible use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic structural diagram of a vibration isolation device provided in an embodiment of the present invention.

[0032] Figure 2 A schematic diagram of the explosion structure of the vibration isolation device provided in an embodiment of the present invention.

[0033] Figure 3 A schematic diagram of the explosion structure of the protective shell provided in an embodiment of the present invention.

[0034] Figure 4 A schematic diagram of the exploded structure of the bearing plate and the force transmission plate provided in an embodiment of the present invention.

[0035] Figure 5 A schematic diagram of the explosion structure of the vibration transmission device and the internal vibration reduction device provided in an embodiment of the present invention.

[0036] Figure 6 A perspective structural diagram of a vibration transmission device and an internal vibration reduction device provided in an embodiment of the present invention.

[0037] Figure 7 A schematic diagram of the top structure of the interior of the vibration isolation device provided in an embodiment of the present invention.

[0038] Figure 8 A schematic diagram of the explosion structure of the internal vibration reduction device provided in an embodiment of the present invention.

[0039] Fig. 9 A schematic diagram of the exploded structure of a cross clamping block provided in an embodiment of the present invention.

[0040] Fig.10 A schematic diagram of the exploded structure of a clamp and an external vibration-damping frame provided in an embodiment of the present invention.

[0041] Fig.11 A perspective structural diagram of a right-angle clamp and an external vibration-damping frame provided in an embodiment of the present invention.

[0042] Fig.12 FIG. 4 is a logarithmic input response amplitude ratio curve diagram of an embodiment of the present invention.

[0043] Figure markings: 1-vibration transmission device, 2-internal vibration damping device, 3-protective shell, 4-self-lubricating plate, 10-bearing plate, 11-force transmission plate, 12-hexagonal nut, 13-cylinder head screw, 14-hexagonal extended nut, 15-spring washer, 16-flat washer, 17-compression spring, 18-sliding rod, 20-cross block, 21-spherical particle damping, 22-four-pointed star block, 23-external vibration damping frame, 30-upper protective shell, 31-lower protective shell, 32-shell fastening screw, 200-flat end fastening screw, 201-right angle clamp, 202-cross frame, 230-arc clamp, 231-right angle clamp, 232-flat end fastening screw, 233-vibration damping baffle. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The scheme adopted by a star-shaped particle damping mechanical metamaterial vibration isolation device of an embodiment of the present invention is: the bearing plate is connected to the device that needs vibration reduction through the through hole of the bearing plate, and the elastic wave generated by the vibration source is evenly transmitted to the internal vibration reduction device through the bearing plate by the force transmission plate in multiple ways, and the elastic wave energy is attenuated in three ways. First, the block and the spherical particle damping in the internal vibration reduction device are arranged periodically. Based on the Bragg scattering mechanism, the propagation of elastic waves in the band gap range is reduced, thereby achieving a vibration reduction effect. Secondly, the overall star-shaped structure of the internal vibration isolation device can further absorb the energy of the elastic wave due to the overall "tension and expansion" characteristics. Finally, spherical particle damping is filled in each internal vibration device, and the energy of the elastic wave is dissipated through the mutual collision and friction between the spherical particle damping, between the spherical particles and the block, and between the spherical particles and the outer frame. The energy absorption of the star-shaped structure and the energy consumption of the particle damping can make the internal vibration reduction device have an attenuation effect on the elastic waves in the frequency range where the fluctuation and vibration can pass, thereby expanding the vibration isolation frequency range. The attenuated elastic wave is transmitted from the vibration transmission device on the opposite side.

[0046] like Figures 1 to 3 As shown, a star-shaped particle damping mechanical metamaterial vibration isolation device according to an embodiment of the present invention comprises: a vibration transmission device 1, an internal vibration reduction device 2, a protective shell 3 and a self-lubricating plate 4. The protective shell 3 is stably placed on a horizontal platform, and the vibration transmission device 1, the internal vibration reduction device 2, and the self-lubricating plate 4 are all kept parallel to the protective shell 3, and the upper and lower surfaces of the internal vibration reduction device 2 are kept in contact with the self-lubricating plate 4. The protective shell 3 is composed of an upper protective shell 30 and a lower protective shell 31 and is connected by a shell fastening screw 32. The lower protective shell 31 is evenly provided with a plurality of through holes along the side of the square, and the upper protective shell 30 is connected to the lower protective shell 31 by the shell fastening screw 32. The lower protective shell 31 is provided with a countersunk hole so that the end face of the shell fastening screw 32 is located on the inner side of the lower protective shell 31 to keep the installation plane flat. The self-lubricating plate 4 is fixed to the upper protective shell 30 and the lower protective shell 31 by epoxy resin adhesive after being treated with naphthalene. In the embodiment of the present invention, the upper protective shell 30 and the lower protective shell 31 are made of acrylic; the self-lubricating plate 4 is made of polytetrafluoroethylene. Since the polytetrafluoroethylene plate has the characteristics of low friction coefficient and good wear resistance, it can reduce the influence of the upper and lower boundaries on the internal vibration reduction device 2 while also playing a protective role, thereby extending the service life of the device.

[0047] like Figure 4The figure shows the connection structure between the bearing plate and the force transmission plate. The bearing plate 10 and the force transmission plate 11 are connected by two cylindrical head screws 13, two hexagonal extended nuts 14, two spring washers 15, four flat washers 16 and two hexagonal nuts 12. The hexagonal extended nuts are used to extend the distance between the bearing plate 10 and the force transmission plate 11 to prevent the bearing plate 10 from colliding with the sliding rod 18 between the two plates. Some through holes of the bearing plate 10 and the force transmission plate 11 are coaxial and are used to connect the external vibration source and the vibration transmission device. In the embodiment of the present invention, the bearing plate 10 and the force transmission plate 11 are both made of ABS (acrylonitrile-butadiene-styrene copolymer); the cylindrical head screws 13, the hexagonal extended nuts 14, the flat washers 16 and the sliding rods 18 are made of stainless steel; the spring washers 15 are made of spring steel.

[0048] like Figure 5 and Figure 6 The figure shows the connection structure between the force transmission rod and the internal vibration damping frame. One end of the sliding rod 18 is connected to the force transmission rod 11 through two hexagonal nuts 12, a spring washer 15 and two flat washers 16, and the other end is connected to the external vibration damping frame 23 through a threaded hole, and the top end presses the bottom of the blind hole of the arc-shaped clamp 230. The middle part of the sliding rod is a smooth rod, which passes through the through hole of the lower protective shell 31. The inside of the through hole is coated with self-lubricating material to reduce wear. The lower protective shell 31 is flexibly connected to the external vibration damping frame 23 through a compression spring 17 to prevent the vibration damping internal frame 23 from excessive displacement and collision with the lower protective shell 31 during use. The compression spring 17 is coaxial with the sliding rod 18 and is always in a compressed state. Its moving trajectory is constrained by the sliding rod and moves in the axial direction. In the embodiment of the present invention, the compression spring 17 is made of stainless steel; the arc-shaped clamp 230 is made of ABS.

[0049] like Figure 7 and Figure 8 The internal vibration damping device 2 is shown as a structure. The internal vibration damping device 2 is composed of a cross block 20, a spherical particle damper 21, a star block 22 and a vibration damping external frame 23. The cross block 20 and the star block 22 are periodically arranged inside the vibration damping external frame 23, so that the structure has a band gap characteristic. The spherical particle damper 21 is closely arranged and fills the gap between the cross block 20, the star block 22, the vibration damping external frame 23 and the self-lubricating plate 4, so that the overall structure has a "tension" characteristic. In the embodiment of the present invention, the spherical particle damper 21 is made of stainless steel; the star block 22 is made of ABS.

[0050] like Fig. 9The cross block structure is shown, the cross block 20 is composed of 8 flat-end set screws 200, 4 right-angle clamps 201 and 1 cross frame 202. The 4 internal right-angle sides of the cross block 20 are each connected with 2 orthogonal flat-end set screws 200 through threaded holes. The 4 right-angle clamps 201 clamp the spherical particle damper 21 in four directions by adjusting each flat-end set screw 200. In the embodiment of the present invention, the flat-end set screw 200 is made of stainless steel; the right-angle clamp 201 and the cross frame 202 are made of ABS.

[0051] like Fig.10 and Fig.11 The structure of the vibration reduction external frame is shown. The vibration reduction external frame 23 is composed of an arc-shaped clamp 230, a right-angle clamp 231, a flat-end set screw 232 and a vibration reduction baffle 233. The flat-end set screw 232 passes through the threaded hole on the side of the vibration reduction baffle 233 to push the arc-shaped clamp 230 and the right-angle clamp 231. The right-angle clamp 231 can press the spherical particle damper 21 by adjusting the two flat-end set screws 232 that are orthogonal to each other, and the arc-shaped clamp 230 pushes the spherical particle damper 21 along the axis direction of its countersunk hole, so that the relative positions of the cross block 20, the spherical particle damper 21 and the star block 22 do not change during use, thereby ensuring the effectiveness of the "tension" characteristic and the band gap characteristic. The arc surface of the arc-shaped presser 230 and the right-angle vertical surface of the right-angle presser 231 are consistent with the contact surface of the corresponding squeezed spherical particle damper 21, thereby improving the pushing effect. In the embodiment of the present invention, the right-angle presser 231 is made of ABS material; the flat-end set screw 232 is made of stainless steel.

[0052] The working principle of the star-shaped particle damping mechanical metamaterial vibration isolation device of the above-mentioned invention embodiment includes:

[0053] The star-shaped structure is a negative Poisson's ratio structure, so it exhibits a "tensile expansion" characteristic, that is, it expands laterally when stretched and contracts laterally when compressed. The star-shaped structure has excellent dissipation capacity for shock and vibration. When the vibration reduction device is vibrated or impacted, the spherical particle damping and the card block will gather toward the external frame of the vibration reduction, thereby enhancing the local stiffness near the external frame of the vibration reduction and improving the energy absorption and protection capabilities of the vibration reduction device.

[0054] The cross blocks and the four-pointed star blocks are periodically staggered in the internal vibration reduction device to divide the periodic blocks, so that the vibration reduction device has a bandgap characteristic. In the bandgap frequency range, the propagation performance of elastic waves is reduced by the interaction of internal components, thereby having a vibration reduction effect. The embodiment of the present invention mainly performs vibration reduction processing on waves within its frequency range based on the Bragg bandgap. According to the Bragg scattering mechanism, its appearance position must meet the following requirements:

[0055]

[0056] Where a is the lattice size of the metamaterial; λ is the wavelength of the elastic wave in the metamaterial.

[0057] For elastic waves outside the band gap frequency range, in addition to the energy absorption and vibration reduction of the negative Poisson's ratio structure, the input elastic wave energy is partially converted into heat energy for dissipation through the friction and collision between spherical particle damping, blocks, and the external frame of the vibration reduction, thereby achieving a vibration reduction effect.

[0058] The embodiment of the present invention provides the elastic wave input of the vibration isolation device at 0 to 1800 Hz and the logarithmic ratio simulation results of the response amplitude. Fig.12 As shown, the vibration reduction device has obvious vibration reduction effects in 20-170Hz, 180-430Hz and above 450Hz. The simulation results show that the embodiment of the present invention can effectively achieve the effect of vibration reduction and noise reduction in a wide low-frequency range by combining the band gap characteristics of the periodic structure, the "tension and expansion" characteristics of the negative Poisson's ratio material and the dissipation effect of particle damping.

[0059] In summary, compared with the previous periodic vibration isolation devices, the outstanding feature of the device of the embodiment of the present invention is that it combines the energy absorption characteristics of the negative Poisson's ratio structure, the band gap characteristics of the mechanical metamaterial and the dissipation characteristics of the particle damper, and can have a significant vibration reduction effect in a wide low-frequency range. And because the internal vibration reduction device adopts a negative Poisson's ratio structure as a whole, the device also has a certain impact resistance. The device provides an easy-to-manufacture, electromagnetic interference-free, and impact-resistant nonlinear vibration isolation and noise reduction device for working conditions where there are elastic waves and vibrations of multiple frequencies.

[0060] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of 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 elements, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or couplings. The term "and / or" as used herein includes any unit and all combinations of one or more of the associated listed items.

[0061] 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 star-shaped particle damping mechanical metamaterial vibration isolation device, characterized in that: It includes a protective shell, a vibration transmission device, a self-lubricating plate, and an internal vibration reduction device: the protective shell is a square prism shell, including an upper protective shell and a lower protective shell, the four corners of the upper protective shell and the lower protective shell are provided with connecting holes and connected by bolts, and the lower protective shell is provided with a plurality of circular through holes along the side of the square; The vibration transmission devices are provided with two, which are arranged on both sides of the protective shell, including a bearing plate, a force transmission plate, a sliding rod and a compression spring. The bearing plate and the force transmission plate are provided with a plurality of through holes, and the external vibration source and the bearing plate, and the bearing plate and the force transmission plate are connected by bolts; both ends of the sliding rod are provided with threads, one end passes through the through hole of the protective shell and is connected to the force transmission plate through a nut and a gasket, and the other end is connected to the internal vibration reduction device through a thread; the compression spring is installed on the sliding rod, one end of which contacts the inner wall of the protective shell, and the other end contacts the internal vibration reduction device; The self-lubricating plates are provided with two, which are respectively fixed to the inner surfaces of the upper and lower protective outer shells to reduce friction; The internal vibration damping device is composed of a vibration damping external frame, a cross block, a four-pointed star block and a spherical particle damper. The vibration damping external frame includes a vibration damping baffle, an arc-shaped clamp and a right-angle clamp. The four sides of the vibration damping external frame are provided with a plurality of threaded holes. In the vibration transmission direction of the vibration transmission device, the sliding rod passes through the threaded holes and is connected to the arc-shaped clamp, and the threaded holes on the other two sides of the vibration damping external frame are connected to the arc-shaped clamp by bolts; the cross block includes a cross frame and a right-angle clamp, and the cross frame and the right-angle clamp are connected by bolts; the cross block and the four-pointed star block are periodically arranged on the inner side of the vibration damping external frame, and the spherical particle damper is arranged in the space formed by the vibration damping external frame, the self-lubricating plate, the cross block and the star block and is clamped by the arc-shaped and right-angle clamps.

2. According to claim 1, a star-shaped particle damping mechanical metamaterial vibration isolation device is characterized in that: The compression spring is longer than the distance between the side of the lower protective shell and the internal vibration reduction device, so that the compression spring is in a compressed state, providing a buffer for the protective shell and the internal vibration reduction device.

3. According to claim 1, a star-shaped particle damping mechanical metamaterial vibration isolation device is characterized in that: The smooth rod portion of the sliding rod passes through the through hole of the protective shell, and the interior of the through hole is coated with a self-lubricating material to reduce the wear of the sliding rod.

4. According to claim 1, a star-shaped particle damping mechanical metamaterial vibration isolation device is characterized in that: The cross blocks and the four-pointed star blocks in the internal vibration reduction device are arranged alternately and periodically, and have the Bragg scattering band gap characteristics. The vibration decays rapidly in the band gap and cannot propagate. However, in the frequency range where waves and vibrations can pass, due to the existence of the spherical particle damping and the overall star-shaped structure, the vibration energy is dissipated to achieve vibration reduction.

5. The star-shaped particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The arc-shaped presser and the right-angle presser squeeze the spherical particle damper through studs or flat-end set screws so that the spherical particle damper is closely arranged in the internal vibration reduction device.

6. The star-shaped particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The protective shell is made of acrylic and is stably placed on a horizontal platform. The vibration transmission device, the self-lubricating plate, and the internal vibration reduction device are all kept parallel to the horizontal planes of the upper protective shell and the lower protective shell.

7. A star-shaped particle damping mechanical metamaterial vibration isolation device according to claim 1 or 6, characterized in that: The bearing surface of the bearing plate is higher than the upper end surface of the screw, so that the bearing plate can be in close contact with the vibration source. The lower protective outer shell connecting hole is a countersunk hole, which is used to make the screw end surface located on the inner side of the lower protective shell to ensure the flatness of the installation plane.

8. A star-shaped particle damping mechanical metamaterial vibration isolation device according to claim 1 or 7, characterized in that: The through holes on the bearing plate are coaxial with part of the through holes on the force transmission plate and are used for connecting an external vibration source.

9. The star-shaped particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The internal vibration reduction device has the best vibration reduction effect when the external excitation frequency is within the range of 20 to 170 Hz, 180 to 430 Hz and above 450 Hz.

10. The star-shaped particle damping mechanical metamaterial vibration isolation device according to claim 1, characterized in that: The internal vibration damping device has a negative Poisson's ratio characteristic and has the ability to resist impact loads; the axis of the sliding rod is maintained in a horizontal plane.

Images