A vibration isolation superstructure device with synergistic effects of planar particle damping and adjustable elastic wave band gap

Abstract

The present invention discloses a vibration isolation superstructure device with synergistic effects of planar particle damping and adjustable elastic wave band gap, comprising a base, an adjustable resonant cavity, rigid spherical particles, a baffle, a sliding device, a fastening bolt and a positioning plate; a plurality of basic units are arranged on the surface of the base, an adjustable resonant cavity and a sliding device are fixed on each basic unit, and the baffle can move back and forth along a groove on the inner wall of the adjustable resonant cavity; the rigid spherical particles are stacked in a space surrounded by the adjustable resonant cavity and the baffle, and the height and shape of the rigid spherical stack change with the movement of the baffle; a positioning plate is arranged on one side of the base plate, and a sliding device is also provided on the positioning plate; each sliding device is composed of two spur gears, two spur racks, a rotating shaft, two bearings and a gear box, and the movement of the spur racks in the vertical direction on the positioning plate realizes the simultaneous movement of all baffles in the planar vibration isolation superstructure device, thereby realizing the adjustment of the elastic wave band gap.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial elastic wave metamaterials, and in particular to a vibration isolation metastructure device with coordinated action of planar particle damping and an adjustable elastic wave band gap. Background Art

[0002] Artificial periodic structures can leverage their unique geometry and material design to create elastic wave band gaps, achieving the goal of reducing vibration and noise. Within a periodic structure, materials with different densities and elastic constants are periodically combined. Disconnected materials are called scatterers, while connected materials are called the matrix. When elastic waves propagate within a periodic structure, influenced by the internal periodic structure, a unique dispersion relation (band structure) is formed. The frequency range between these dispersion curves is called the band gap. Theoretically, elastic waves within the band gap frequency range are suppressed, while elastic waves in other frequency ranges (passbands) propagate losslessly due to the dispersion relation. Consequently, research on the propagation characteristics of elastic waves and vibrations within periodic structures has attracted widespread attention. Elastic wave superstructures, which possess frequency band gaps where elastic waves and vibrations are prohibited from propagating, can be widely used in vibration isolation applications in mechanical engineering, civil engineering, aerospace, and other fields.

[0003] Traditional vibration isolation devices utilize a fixed periodic structure, limiting their elastic wave band gap to a specific frequency range. This narrow band gap can only suppress elastic waves of a specific frequency, and the isolation effect is heavily dependent on the source frequency. When the source frequency is close to the center frequency of the band gap, the propagation of elastic waves can be effectively suppressed. However, when the source frequency is far from the center frequency of the band gap, the traditional vibration isolation device fails to function, requiring a complete change in the device's structural dimensions, significantly reducing its practicality. Furthermore, traditional vibration isolation devices struggle to achieve effective isolation in complex vibration situations, such as environments with multiple vibration frequencies or variable vibration frequencies.

[0004] Incorporating dampers into vibration isolation devices can effectively improve their effectiveness. Common dampers include magnetorheological dampers, viscoelastic dampers, shape memory alloy dampers, and particle dampers. However, in outdoor conditions, energy-dissipating materials such as viscous fluids and shape memory alloys are sensitive to temperature fluctuations, significantly impacting damper performance. Particle dampers are highly robust passive dampers consisting of a cavity and internal particles. This cavity can be either internal to the structure or attached to it, and the particles contained within can be of varying materials, shapes, and sizes. Particle dampers exhibit highly nonlinear behavior, dissipating structural energy through collisions between particles and cavity walls, as well as frictional collisions between particles, achieving a vibration reduction effect. Furthermore, particle dampers offer a simple structure, easy installation, and excellent vibration reduction performance, making them suitable for a variety of complex environments. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a vibration isolation superstructure device in which planar particle damping and an adjustable elastic wave band gap work together, thereby realizing a rigid connection vibration isolation method with an adjustable elastic wave band gap and meeting the vibration isolation problem under higher support strength.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A vibration isolation superstructure device with planar particle damping and adjustable elastic wave band gap, comprising a base and a positioning plate, wherein the base is divided into a plurality of square basic units in an array, each of the basic units being provided with an adjustable resonant cavity, a sliding device, a baffle and rigid spherical particles; a threaded blind hole is provided on the surface of each basic unit, and the sliding device is fixed by a fastening bolt and the threaded blind hole; the adjustable resonant cavity is fixed at the center of the basic unit, and rectangular grooves are provided on the inner walls of the adjustable resonant cavity on three sides; a protrusion is provided on the baffle that fits with the rectangular groove, and the baffle can move back and forth along the rectangular groove via the protrusion; a square boss is provided on the outer surface of the baffle; the rigid spherical particles are arranged in the space surrounded by the adjustable resonant cavity and the baffle to form a rectangular stack;

[0008] The positioning plate is in a rectangular structure and is arranged on one side of the base. A plurality of positioning plate units having the same width as the basic unit are provided in the length direction of the positioning plate, and a sliding device is installed on each positioning plate unit;

[0009] Each sliding device includes two spur gears, a rotating shaft, two spur racks, two bearings and a gearbox; the two spur gears are fixed on the same rotating shaft and rotate concentrically; the rotating shaft is fixed to the gearbox through two upper and lower bearings; the spur racks mesh with the spur gears; the two spur racks are staggered up and down and kept vertically placed; the front end of a spur rack of the sliding device in each basic unit is fixedly connected to the square boss on the surface of the baffle to realize the forward and backward movement of the baffle, and the other spur rack is connected to the spur rack in the same direction in the adjacent basic unit; one spur rack in each sliding device in the positioning plate unit is connected to the spur rack in the same direction in the adjacent positioning plate unit, and the other spur rack is connected to the spur rack in the same direction in the adjacent basic unit; two circular through holes are provided on the upper and lower surfaces of the gearbox for fixing the bearings; two rectangular through holes are provided on the left and right surfaces and the front and rear surfaces of the gearbox respectively for passing through two mutually perpendicular spur racks; the sliding device fixed on the surface of the positioning plate can realize the simultaneous movement of all baffles in the vibration isolation superstructure device and adjust the elastic wave band gap.

[0010] Furthermore, the straight rack can push the baffle to move forward and backward along the rectangular groove. Self-lubricating material is added to the rectangular groove to reduce friction and reduce noise generated during the sliding process.

[0011] Furthermore, the baffle moves back and forth in the rectangular groove, which can adjust the structure of the space enclosed by the baffle and the adjustable resonance cavity and change the shape of the rigid spherical particle stack in the adjustable resonance cavity, thereby adjusting the elastic wave band gap.

[0012] Furthermore, the collisions between the rigid spherical particles and the collisions between the rigid spherical particles and the inner wall of the adjustable resonance cavity realize a particle damping effect, which cooperates with the elastic wave band gap to achieve the purpose of vibration isolation.

[0013] Furthermore, the diameter of the rigid spherical particles is greater than the width of the rectangular groove in the adjustable resonance cavity, and the height of the rigid spherical particle stack in the adjustable resonance cavity is less than the height of the adjustable resonance cavity.

[0014] Furthermore, a rectangular platform is provided at the bottom of the rectangular through hole, and the surface of the rectangular platform is covered with a self-lubricating material so as to support the forward and backward movement of the spur rack and reduce friction.

[0015] Furthermore, the spacing between the gear boxes is equal to the side length of the basic unit, and this spacing is equal to an integer multiple of the spur rack pitch, so that the positions of the baffles can be simultaneously adjusted through the interconnected spur racks.

[0016] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0017] 1. The device of the present invention is a planar vibration isolation superstructure device as a whole. There is a complete band gap in the band structure of its basic unit. Compared with linear vibration isolation devices, it can achieve vibration isolation effects in multiple different directions within the plane, breaking the limitation of vibration isolation in a single direction.

[0018] 2. The sliding device of the present invention adopts a gear rack mechanism, which has a simple transmission method and no sliding during the transmission process, and has high transmission stability. By reasonably designing the tooth shape of the gear rack, high transmission accuracy can be guaranteed. Compared with general transmission mechanisms, it has the advantages of high precision, good stability, and strong durability.

[0019] 3. The device of the present invention has a simple structure and is easy to install. The periodic distribution of the basic units can be rationally designed according to the size of the vibration source area, making it applicable to a variety of complex environments. In addition to varying vibration source areas, it also includes different types of vibration source frequencies. The device of the present invention can achieve good suppression effects for single vibration frequencies, multiple vibration frequencies, and variable vibration frequencies, thus possessing excellent practical value.

[0020] 4. The sliding devices in the present invention are interconnected, and the position changes of all baffles in the planar vibration isolation superstructure device can be simultaneously controlled by the straight rack on the positioning plate, which is convenient for operation and adjustment.

[0021] 5. The forward and backward movement of the baffle position of the present invention changes the spatial structure of the basic unit of the planar vibration isolation superstructure, thereby changing the position and range of the elastic wave band gap. In application, the band gap range can be conveniently adjusted in a timely manner according to the vibration source conditions, and ultimately a suitable band gap range is selected to maximize the suppression of elastic wave propagation, thereby realizing an adjustable elastic wave band gap of the planar vibration isolation superstructure device.

[0022] 6. The spatial distribution of the rigid sphere stack within the adjustable resonant cavity of the present invention can be altered by changing the position of the baffle. Vibration energy is dissipated through collisions between the rigid spheres and with the inner wall of the resonant cavity, thereby achieving varying particle damping effects. The particle damper also effectively suppresses vibration frequencies within the passband. The synergistic effect of the particle damper and the adjustable elastic band gap further enhances the device's ability to suppress complex vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1a and Figure 1b Schematic diagram of the three-dimensional structure of the vibration isolation superstructure device provided by an embodiment of the present invention at different viewing angles.

[0024] Figure 2a and Figure 2b Schematic diagram of the three-dimensional structure of the vibration isolation superstructure device provided by an embodiment of the present invention at different viewing angles (with the baffle position changed).

[0025] Figure 3a and Figure 3b Schematic diagrams of the perspective structure of the vibration isolation superstructure device provided by the embodiment of the present invention at different viewing angles.

[0026] Figure 4 This is a schematic structural diagram of a vibration isolation superstructure device provided in an embodiment of the present invention.

[0027] Figure 5 for Figure 4 Schematic diagram of the exploded structure of the mid-plane vibration isolation superstructure device.

[0028] Figure 6 for Figure 5 Schematic diagram of the exploded structure of the sliding device.

[0029] Figure 7 A schematic cross-sectional view of a gearbox structure provided in an embodiment of the present invention.

[0030] Figure 8a and Figure 8b A cross-sectional schematic diagram of a basic unit in a vibration isolation superstructure device provided by an embodiment of the present invention, wherein Figure 8a represents the basic unit consisting of rigid spherical particles, Figure 8b Represents the basic unit that does not include rigid spherical particles.

[0031] Figure 9 Schematic diagram of the first Brillouin zone of a basic unit of a planar vibration isolation superstructure device provided in an embodiment of the present invention.

[0032] Figure 10 、 Figure 12 、 Figure 14 1 is an energy band structure diagram of the wave vector along the Γ-MX-Γ direction when the baffle of the planar vibration isolation superstructure device in an embodiment of the present invention is located at different positions.

[0033] Figure 11 、 Figure 13 、 Figure 15 1 is a response curve diagram of vibration propagation along the y direction when the baffle of the planar vibration isolation superstructure device in an embodiment of the present invention is located at different positions, wherein the dotted area corresponds to the full band gap frequency range in the band structure.

[0034] Figure 16 、 Figure 18 、 Figure 20 Response curves of the vibration frequency within the passband frequency range when the baffle of the planar vibration isolation superstructure device in an embodiment of the present invention is located at different positions, wherein the solid line corresponds to the superstructure device without rigid spherical particles, and the dotted line corresponds to the superstructure device with rigid spherical particles.

[0035] Figure 17 、 Figure 19 、 Figure 21 Response curves of the vibration frequency within the forbidden frequency range when the baffle of the planar vibration isolation superstructure device in an embodiment of the present invention is located at different positions, wherein the solid line corresponds to the superstructure device without rigid spherical particles, and the dotted line corresponds to the superstructure device with rigid spherical particles.

[0036] Reference numerals: 1-base, 2-adjustable resonance cavity, 3-rigid spherical particles, 4-baffle, 5-gearbox, 6-spur gear, 7-spur rack, 8-rotating shaft, 9-bearing, 10-fastening bolt, 11-positioning plate DETAILED DESCRIPTION

[0037] 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.

[0038] The embodiment of the present invention employs a vibration isolation superstructure device that synergizes planar particle damping with an adjustable elastic band gap. The device is installed in a work area requiring vibration isolation at a specific frequency. Elastic waves are transmitted through the base to the basic unit of the planar vibration isolation superstructure. Adjusting the position of the baffles in the planar vibration isolation superstructure changes the position and range of the elastic band gap, placing the vibration source frequency within the band gap frequency range and achieving a completely vibration-free working environment within the band gap. Simultaneously, during vibration, the rigid spherical scatterers dissipate energy through collisions between the rigid spherical particles and with the inner wall of the adjustable resonant cavity. The particle damping effect and the adjustable elastic band gap synergistically enhance the vibration isolation effect for elastic waves of a specific frequency. This device includes a sliding mechanism fixed to the surfaces of the positioning plate and the base. By interconnecting adjacent spur racks, all baffles in the device can be simultaneously moved back and forth along the rectangular grooves in the inner walls of the corresponding adjustable resonant cavities under the action of the rack-and-pinion transmission mechanism, thereby adjusting the elastic wave band gap. The spatial distribution of the rigid sphere scatterers in the device can also be varied, thereby achieving different particle damping effects. For different vibration conditions, when the source frequency is within the passband frequency range of the planar vibration isolation superstructure, the vibration isolation is mainly achieved by the rigid sphere particle damping effect. When the source frequency is within the band gap frequency range of the planar vibration isolation superstructure, the vibration isolation is mainly achieved by the Bragg scattering mechanism and local resonance mechanism of the periodic structure.

[0039] The vibration isolation superstructure device provided by the embodiment of the present invention with the coordinated action of planar particle damping and adjustable elastic wave band gap is as follows: Figure 1a-Figure 6 As shown, it includes a base 1 and a positioning plate 11. The base 1 is placed horizontally, and the overall structure is square. The base 1 is divided into several square basic units in the form of an array, and the period distribution of the basic units can be flexibly set according to the size of the vibration source area. Each basic unit is provided with an adjustable resonance cavity 2, a sliding device, a baffle 4 and rigid spherical particles 3; the surface of each basic unit is provided with a threaded blind hole, and the sliding device is fixed by fastening bolts 10 and the threaded blind hole. The adjustable resonance cavity 2 is placed at the center of each basic unit, and the bottom of the adjustable resonance cavity 2 is fixedly connected to the basic unit; the three inner walls of the adjustable resonance cavity 2 are provided with rectangular grooves, and the baffle 4 is provided with a protrusion that fits with the rectangular groove. The baffle 4 can move back and forth along the rectangular groove through the protrusion; the rigid spherical particles 3 are placed in the rectangular area surrounded by the adjustable resonance cavity 2 and the baffle 4.

[0040] The outer surface of the baffle 4 is provided with a square boss, and the baffle 4 is fixedly connected to the spur rack through the square boss. The spur gear 6 can drive the spur rack 7 to move back and forth to change the position of the baffle 4. The three-dimensional space diagram of the baffle 4 in different positions is shown in FIG. Figures 1a to 2b As shown, Figure 3a and Figure 3b A perspective view of a 4*4 periodic structure provided by this embodiment is shown. Figure 4 、 Figure 5 、 Figure 6 The structural diagram and exploded structure diagram of each part of the device are shown.

[0041] The positioning plate 11 is in a rectangular structure and is arranged on one side of the base. A plurality of positioning plate units having the same width as the basic unit are provided in the length direction of the positioning plate 11 , and a sliding device is installed on each positioning plate unit.

[0042] In this embodiment, each sliding device is composed of two spur gears 6, two spur racks 7, a rotating shaft 8, two bearings 9 and a gear box 5. The two spur gears 6 are fixed on the rotating shaft 8 and can maintain concentric rotation, and can drive the two spur racks 7 to move forward and backward in directions perpendicular to each other. The gear box 5 is fixed to the surface of the base 1 by fastening bolts 10, and the rotating shaft is fixed in the gear box 5 by two bearings 9. The rotating shaft 8 has no direct contact with the gear box 5 and the base 1, which can reduce friction. One spur rack 7 of the sliding device in each basic unit is fixedly connected to the baffle 4 to push the baffle forward and backward, and the other spur rack 7 is connected to the adjacent sliding device to achieve simultaneous movement of the baffle in the same horizontal direction. One spur rack in the sliding device of each positioning plate unit is connected to the spur rack in the same direction in the adjacent positioning plate unit, and the other spur rack is connected to the spur rack in the same direction in the adjacent basic unit.

[0043] Preferably, see Figure 4 and Figure 5 In this embodiment, each sliding device in the same row in the horizontal direction on the positioning plate and the base shares a straight rack 7, and each sliding device in the same column in the longitudinal direction on the positioning plate shares a straight rack 7. The horizontal and longitudinal straight racks 7 are perpendicular to each other, so that the baffles of each basic unit at different horizontal positions in the planar vibration isolation superstructure can move simultaneously. The exploded structural diagram of the sliding device is shown in FIG. Figure 6 As shown, Figure 7 A schematic cross-section diagram showing the gearbox structure.

[0044] In the present embodiment, the rigid ball particles 3 are distributed in the rectangular space surrounded by the adjustable resonant cavity 2 and the baffle 4. The diameter of the rigid ball particles should be greater than the width of the rectangular groove in the adjustable resonant cavity. The height of the rigid ball particle stack in the resonant cavity must not exceed the height of the resonant cavity. The material parameters of the rigid balls can be changed according to different vibration conditions, thereby achieving different particle damping effects. Adding self-lubricating material in the rectangular groove can reduce friction and reduce the noise generated during the sliding process. The spur gear 6 and the spur rack 7 are meshed with each other in the sliding device and are periodically distributed in the device. The spacing between two adjacent gear boxes 5 should be equal to the side length of the plane vibration isolation superstructure basic unit, and this spacing should be equal to an integer multiple of the spur rack pitch, so that the position of each baffle can be simultaneously controlled by the positioning plate. The surface of the gear box 5 is provided with two mutually perpendicular rectangular through holes, and a rectangular platform is provided at the bottom of the rectangular through hole. The surface of the rectangular platform is covered with self-lubricating material to support the forward and backward movement of the spur rack and reduce friction. The above arrangement further improves the practicality and reliability of the plane vibration isolation superstructure device based on particle damping.

[0045] The basic unit of the planar vibration isolation superstructure provided in this embodiment is as follows: Figure 8b As shown, the basic unit does not contain rigid spherical particles. The base, adjustable resonant cavity and baffle are made of the same stainless steel material with elastic modulus E = 200 GPa, Poisson's ratio ν is 0.29, and density ρ is 7870 kg / m 3 , the side length of the basic unit is a = 51.84 mm, and the side length of the basic unit is an integer multiple of the spur rack pitch. The first Brillouin zone of the basic unit of the planar vibration isolation superstructure is as follows Figure 9 As shown, by performing parameterized sweep of the Bloch wave vector along the Γ-MX-Γ direction in the first Brillouin zone, the band structures of the baffle at different positions of the adjustable resonant cavity are obtained as shown in Figure 10 、 Figure 12 and Figure 14 As shown in the figure, the dotted area represents the full band gap frequency range of the structure. As can be seen from the band structure diagram, when the baffle is located at different positions, the center frequency of the elastic wave band gap and the width of the band gap change significantly. The basic units are arrayed in the x and y directions to obtain a planar vibration isolation superstructure. By giving a specified displacement excitation in the y direction, the frequency response curves of the baffle at different positions in the adjustable resonant cavity are obtained as shown in the figure. Figure 11 、 Figure 13 and Figure 15 As shown in the figure, the dotted area corresponds to the full bandgap frequency range in the band structure. As can be seen from the figure, the vibration propagation within the bandgap frequency range is effectively suppressed, with the amplitude reduced by more than 15dB.

[0046] The basic unit of the planar vibration isolation superstructure provided in this embodiment is as follows: Figure 8a and Figure 8bAs shown, Figure 8a represents the basic unit consisting of rigid spherical particles, Figure 8b represents the basic unit without rigid spherical particles. The two basic units are arrayed in the x and y directions to obtain two planar vibration isolation superstructures. The rigid spherical particles are made of the same stainless steel material with an elastic modulus E = 200 GPa, a Poisson's ratio ν of 0.29, and a density ρ of 7870 kg / m 3 For the two planar vibration isolation superstructures, the vibration responses of the structures when the baffles are located at different positions under single-point excitation are as follows: Figures 16-21 As shown. Among them, Figure 16 、 Figure 18 、 Figure 20 They represent the vibration responses of two planar vibration isolation superstructures when the excitation frequency is within the passband frequency range of the periodic structure. Figure 17 、 Figure 19 、 Figure 21 The graphs represent the vibration responses of two planar vibration isolation superstructures when the excitation frequency falls within the bandgap frequency range of the periodic structure. The response graphs show that the particle damping effect effectively suppresses vibrations within both the passband and bandgap frequency ranges, effectively reducing the amplitude of the structural vibration response. Furthermore, it is evident that the vibration response within the elastic wave bandgap frequency range is significantly smaller than that within the passband frequency range.

[0047] The working principle of the vibration isolation superstructure device with coordinated action of planar particle damping and adjustable elastic band gap in the embodiment of the present invention includes:

[0048] The planar vibration isolation superstructure in this device is composed of basic units periodically arranged in space. Due to the bandgap characteristics of the artificial periodic structure, when elastic waves propagate within the structure, they are affected by the interactions between the basic units within the periodic structure and the resonance characteristics of individual basic units. This prevents elastic waves from propagating within certain frequency ranges, known as bandgaps. The propagation performance of elastic waves and vibrations within these bandgaps is reduced, thus achieving the purpose of vibration isolation. By adjusting the shape, structural parameters, or material properties of the artificial periodic structure, the center frequency and width of the bandgap can be controlled, thereby realizing the unique vibration characteristics of the planar vibration isolation superstructure.

[0049] This device is a vibration isolation superstructure that combines planar particle damping with an adjustable elastic bandgap. Vibration energy is dissipated through collisions between rigid spherical particles and the inner wall of an adjustable resonant cavity, as well as between the particles themselves, further enhancing the vibration isolation performance of the planar vibration isolation superstructure. The size and material of the rigid spherical particles can be flexibly selected based on the vibration conditions. Furthermore, the spatial distribution of the stacked rigid spheres changes with the forward and backward movement of the baffle, achieving varying particle damping effects. This provides excellent vibration suppression for vibration frequencies within the structure's passband or forbidden bandgap, further expanding the frequency range that can be suppressed by the planar vibration isolation superstructure and providing new insights into the design of periodic elastic wave superstructures.

[0050] According to the finite element results, the energy band structure and vibration conditions of the baffle in the embodiment of the present invention at three different positions were calculated. Figure 10 、 Figure 12 and Figure 14 It can be seen from the energy band results that the change in the position of the baffle causes the structural change of the basic unit of the planar vibration isolation superstructure, thereby changing the elastic wave band gap position and frequency range. Figure 11 、 Figure 13 and Figure 15 The vibration response curve of the planar vibration isolation superstructure shown in the figure shows that the specific frequency vibration response within the band gap range is effectively suppressed. In addition, the effect of rigid spherical particles on the vibration response is calculated. Figures 16-21 The response curves shown indicate that the particle damping effect can significantly reduce the vibration response at various frequencies, including frequencies in the passband and bandgap, and the vibration response in the bandgap range is significantly smaller than that in the passband range.

[0051] In summary, compared with previous vibration isolation devices, the outstanding feature of the device of the embodiment of the present invention is that it adopts a planar vibration isolation superstructure that cooperates with particle damping and an adjustable elastic wave band gap, which can suppress the propagation of vibrations of various frequencies in multiple directions in the plane. When the vibration frequency is within the elastic wave band gap frequency range, a vibration-free working environment within the forbidden band can be achieved; when the vibration frequency is within the passband frequency range, the particle damping effect can significantly reduce the vibration response of the structure. By adjusting the position of the baffle in the basic unit, the structure of the basic unit can be changed, thereby achieving changes in the band gap frequency range and the band gap width, and at the same time changing the spatial distribution of the rigid sphere stack, thereby achieving different particle damping effects, effectively increasing the frequency range that the device can suppress. In response to elastic waves and vibrations in different directions and frequencies in the plane, the device provides an adjustable, easy-to-operate, purely mechanically controlled nonlinear vibration isolation device that can flexibly select vibration frequencies.

[0052] The device and system embodiments described above are merely illustrative. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units. They may be located in one place 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.

[0053] 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 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" as used herein includes any unit and all combinations of one or more of the associated listed items.

[0054] 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 vibration isolation superstructure device with synergistic effects of planar particle damping and adjustable elastic wave band gap, characterized in that: The invention comprises a base and a positioning plate, wherein the base is divided into a plurality of square basic units in an array form, each of the basic units being provided with an adjustable resonant cavity, a sliding device, a baffle and rigid spherical particles; a threaded blind hole is provided on the surface of each basic unit, and the sliding device is fixed by fastening bolts and the threaded blind hole; the adjustable resonant cavity is fixed at the center of the basic unit, and rectangular grooves are provided on the inner walls of the three sides of the adjustable resonant cavity; a protrusion that fits into the rectangular groove is provided on the baffle, and the baffle can move forward and backward along the rectangular groove through the protrusion; a square boss is provided on the outer surface of the baffle; the rigid spherical particles are arranged in the space surrounded by the adjustable resonant cavity and the baffle to form a rectangular stack; The positioning plate is in a rectangular structure and is arranged on one side of the base. A plurality of positioning plate units having the same width as the basic unit are provided in the length direction of the positioning plate, and a sliding device is installed on each positioning plate unit; Each sliding device includes two spur gears, a rotating shaft, two spur racks, two bearings and a gear box; the two spur gears are fixed on the same rotating shaft and rotate concentrically; the rotating shaft is fixed to the gear box through two upper and lower bearings; the spur racks and the spur gears mesh with each other; the two spur racks are staggered up and down and kept vertically placed; the front end of a spur rack of the sliding device in each basic unit is fixedly connected to the square boss on the surface of the baffle to realize the forward and backward movement of the baffle, and the other spur rack is connected to the spur rack in the same direction in the adjacent basic unit; one spur rack in the sliding device of each positioning plate unit is connected to the spur rack in the same direction in the adjacent positioning plate unit, and the other spur rack is connected to the spur rack in the same direction in the adjacent basic unit; two circular through holes are provided on the upper and lower surfaces of the gear box for fixing the bearings; two rectangular through holes are provided on the left and right surfaces and the front and rear surfaces of the gear box respectively for passing through two mutually perpendicular spur racks; the sliding device fixed on the surface of the positioning plate can realize the simultaneous movement of all baffles in the vibration isolation superstructure device and the adjustment of the elastic wave band gap.

2. The vibration isolation superstructure device with planar particle damping and adjustable elastic band gap according to claim 1, characterized in that: The straight rack can push the baffle to move back and forth along the rectangular groove. Self-lubricating material is added to the rectangular groove to reduce friction and reduce noise generated during the sliding process.

3. The vibration isolation superstructure device with planar particle damping and adjustable elastic band gap according to claim 1, characterized in that: The baffle moves back and forth in the rectangular groove, which can adjust the structure of the space enclosed by the baffle and the adjustable resonance cavity and change the shape of the rigid spherical particle stack in the adjustable resonance cavity, thereby adjusting the elastic wave band gap.

4. The vibration isolation superstructure device with planar particle damping and adjustable elastic band gap according to claim 1, characterized in that: The collision between the rigid spherical particles and the collision between the rigid spherical particles and the inner wall of the adjustable resonance cavity realize the particle damping effect, which cooperates with the elastic wave band gap to achieve the purpose of vibration isolation.

5. The vibration isolation superstructure device with coordinated action of planar particle damping and adjustable elastic band gap according to claim 1, characterized in that: The diameter of the rigid spherical particles is greater than the width of the rectangular groove in the adjustable resonance cavity, and the height of the rigid spherical particle stack in the adjustable resonance cavity is less than the height of the adjustable resonance cavity.

6. The vibration isolation superstructure device with coordinated action of planar particle damping and adjustable elastic band gap according to claim 1, characterized in that: A rectangular platform is provided at the bottom of the rectangular through hole, and the surface of the rectangular platform is covered with self-lubricating material so as to support the forward and backward movement of the spur rack and reduce friction.

7. The vibration isolation superstructure device with planar particle damping and adjustable elastic band gap according to claim 1, characterized in that: The spacing between the gear boxes is equal to the side length of the basic unit, and this spacing is equal to an integer multiple of the spur rack pitch, so that the position of each baffle can be simultaneously adjusted by the interconnected spur racks.

Images