Electromagnet nonlinear variable stiffness unit cell and metamaterial vibration isolation support

Abstract

The invention relates to an electromagnet nonlinear variable stiffness unit cell and metamaterial vibration isolation support which comprises an electromagnet-spring-electromagnet variable stiffness unit, an auxiliary stiffness adjusting component and a stiffness adjusting and eddy current damping energy dissipation component, and the electromagnet-spring-electromagnet variable stiffness unit comprises a first electromagnet, a second electromagnet and a pre-pressing spring. The first electromagnet and the second electromagnet are connected through a pre-pressing spring, the auxiliary rigidity adjusting component comprises a magnetic support and a hollow sleeve, the electromagnets are connected with the magnetic support through springs, the rigidity adjusting and eddy current damping energy dissipation component comprises an electrified guide plate and a magnetic guide plate, and the electrified guide plate and the magnetic guide plate are arranged on the hollow sleeve at intervals. The electromagnet-spring-electromagnet variable stiffness unit penetrates through the hollow sleeve in a suspended mode. Compared with the prior art, the time-varying controllable and adjustable rigidity in the local resonance unit in the metamaterial unit cell is realized, and the self-adaptive band gap adjustment and vibration reduction enhancement effect based on the displacement amplitude is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering and relates to an electromagnet nonlinear variable stiffness unit cell and a metamaterial vibration isolation support. Background Art

[0002] Metamaterials are new artificial composite periodic materials based on artificial structural unit cells, which can achieve mechanical properties that traditional natural materials cannot achieve. Traditional local resonance metamaterials set local resonance units wrapped by flexible materials in the unit cell structure, thereby generating a band gap that prevents the propagation of elastic waves, which provides the possibility of achieving low-frequency band gaps and constructing metamaterials in the field of earthquake engineering. However, local resonance metamaterials are insufficient in effectively attenuating elastic waves (equivalent damping) in the resonance band gap. To achieve low-frequency and broadband band gaps, it is often necessary to increase the additional mass of the resonance unit and reduce the stiffness in the resonance unit; the metamaterial unit cell and structural form do not have the time-varying adjustable mechanical parameters of the metamaterial, which limits the application of such technologies in complex engineering and intelligent manufacturing (construction) engineering.

[0003] Patent CN115789164A discloses a low-frequency vibration isolation device with adjustable stiffness in which rubber and electromagnetic are connected in parallel, including an upper support platform, a rubber support structure, a base, a central axis and a vibration isolator. The vibration isolator is a linear magnetic negative stiffness low-frequency vibration isolator including a vibration isolation box, two spring positive stiffness modules installed in the vibration isolation box, and an electromagnetic negative stiffness module. The electromagnetic negative stiffness module includes an upper annular permanent magnet, a middle annular permanent magnet and a lower annular permanent magnet arranged axially along the central axis, and an annular coil configured for each permanent magnet. This patent adjusts the negative stiffness of the electromagnetic negative stiffness module by adjusting the compression of the spring positive stiffness unit, thereby ensuring that the system has both high load-bearing capacity and low-frequency vibration isolation performance, but the electromagnetic negative stiffness module of this patent can only provide negative stiffness for the vibration isolation device; at the same time, although linear negative stiffness is provided by coupling the attractive electromagnetic negative stiffness structure and the repulsive electromagnetic negative stiffness mechanism, it cannot provide nonlinear enhanced negative stiffness coordinated with displacement and positive stiffness-quasi-zero stiffness-negative stiffness that is time-varying and controllable.

[0004] Patent CN206234312U discloses a magnetic quasi-zero stiffness isolator with adjustable stiffness, in which an elastic capsule providing positive stiffness is connected in parallel with three transversely magnetized rectangular magnetic blocks providing negative stiffness. When the vibration isolation mass changes, the working position of the elastic capsule is controlled to remain unchanged, and the positive stiffness of the elastic capsule changes due to changes in internal pressure. At the same time, the position of the magnet is adjusted laterally to match the positive stiffness at this time. However, this patent is still a traditional attractive three-magnet negative stiffness structure, which means that this patent can only achieve the negative stiffness effect, and does not have the time-varying controllable and adjustable capabilities of positive stiffness, quasi-zero stiffness and negative stiffness; and the traditional structure has defects such as complexity and low adjustment accuracy, which makes it difficult to expand into a metamaterial unit cell design configuration.

[0005] Patent CN112460177A discloses a quasi-zero stiffness isolator with adaptive adjustment of negative stiffness. The motor drives the coupling to rotate the screw at the same time. The screw slider adjusts the negative stiffness adjustment spring according to the forward and reverse rotation of the motor, and adjusts the two flexible connecting rods to the middle connector to achieve negative stiffness adjustment of load mass changes. However, this patent completely uses mechanical structure to adjust negative stiffness, which has defects such as complex structure and poor sensitivity; the motor and mechanical structure make it difficult for this patent to control the volume of the structure, and the reliability of unit cell stacking is low, which cannot be expanded to the design configuration of metamaterial unit cells.

[0006] Patent CN215334137U discloses an electromagnetic damping magnetorheological vibration absorber, including: a cylindrical shell, an outer magnet yoke, an inner magnet yoke of a mass block coil group, a central axis rod, a spring and a spring; the inner magnet yoke is directly stuck on the central axis rod, the mass block group contains a damping channel, which is located on the central axis rod, outside the inner magnet yoke, forming an internal loop, a coil is wound on the mass block, and the outer magnet yoke is located outside the coil. Although this patent realizes energy dissipation by cutting the magnetic field by the mass block, and realizes mass adjustment by magnetorheological fluid, the displacement of the mass block is consistent with the external displacement (that is, it does not have additional internal vibration degrees of freedom), which limits its effect of amplifying the deformation of the nonlinear damping element under small deformation conditions; it does not have the time-varying controllable and adjustable capabilities of positive stiffness, quasi-zero stiffness and negative stiffness, and cannot achieve an adaptive vibration reduction effect based on displacement amplitude.

[0007] Patent CN116336119A discloses an electromagnetic variable stiffness and variable damping vibration isolator, including a load platform, a vibration isolation element, a coil wound on a cylinder, a permanent magnet, a base and a variable stiffness and variable damping control unit; the vibration isolation element is arranged on the base to support the load platform, the cylinder is fixed at the bottom of the load platform, the permanent magnet is arranged on the base and is located outside the coil; the variable stiffness and variable damping control unit includes a main control board, a current control module and a vibration sensor; the vibration sensor is fixed on the load platform, and the main control board is electrically connected to the vibration sensor and the current control module respectively. Although the device of this patent realizes equipment vibration control by introducing an electromagnetic variable stiffness-damping device, the displacement of the load platform is consistent with that of the vibration isolator (i.e., it does not have additional internal vibration degrees of freedom), and it is unable to provide a local resonance mechanism inside the vibration isolator, and it is unable to realize the deformation amplification of the nonlinear damping element under the small deformation vibration scenario, and it does not have the ability to form a metamaterial vibration isolation layer to establish a wide-band low-frequency bandgap.

[0008] Patent CN114087308A discloses an electromagnetic non-smooth vibration absorber, comprising: a first electromagnet, a second electromagnet, a mass block, a sleeve, an electromagnet power supply module, a guide rail, a connecting rod, a tension spring and an outer frame, wherein the first electromagnet is installed in the sleeve, and the upper bottom surface and the lower bottom surface of the mass block are respectively connected to a second electromagnet through a connecting rod; a tension spring is installed between the left side of the mass block and the left inner wall of the outer frame, and a tension spring is installed between the right side of the mass block and the right inner wall of the outer frame; the top of the guide rail is connected to the top inner wall of the outer frame, and the bottom of the guide rail is connected to the bottom inner wall of the outer frame; the second electromagnet connected to the upper bottom surface of the mass block is connected to the polarity of the first electromagnet installed on the top of the outer frame and is attracted; the second electromagnet connected to the lower bottom surface of the mass block is connected to the polarity of the first electromagnet installed on the bottom of the outer frame and is attracted. Although the device of this patent achieves the effect of nonlinear vibration absorption by using a proximity switch-solid-state relay, the design can only achieve a non-smooth single variable stiffness point, and cannot achieve adjustable and controllable deformation position of the variable stiffness point. It has not yet involved the time-varying mechanism of positive stiffness-quasi-zero stiffness-negative stiffness, and cannot expand the metamaterial unit cell configuration with variable stiffness and electromagnetic damping enhancement. Summary of the invention

[0009] The purpose of the present invention is to provide an electromagnet nonlinear variable stiffness unit cell and a metamaterial vibration isolation support in order to overcome at least one defect of the above-mentioned prior art. The present invention realizes the time-varying controllable and adjustable stiffness in the local resonance unit of the metamaterial unit cell, and realizes adaptive band gap adjustment and vibration reduction enhancement effect based on displacement amplitude.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] One of the technical solutions of the present invention is to provide an electromagnet nonlinear variable stiffness unit cell, which includes an electromagnet-spring-electromagnet variable stiffness unit, an auxiliary stiffness adjustment component, a stiffness adjustment and eddy current damping energy dissipation component,

[0012] The electromagnet-spring-electromagnet variable stiffness unit comprises a first electromagnet, a second electromagnet and a preload spring, wherein the first electromagnet and the second electromagnet are connected via the preload spring.

[0013] The auxiliary stiffness adjustment component includes a magnetic support and a hollow sleeve, and the electromagnet is connected to the magnetic support through a spring.

[0014] The stiffness adjustment and eddy current damping energy dissipation component comprises a current conducting plate and a magnetic conducting plate, the current conducting plate and the magnetic conducting plate are arranged at intervals on the hollow sleeve, and the electromagnet-spring-electromagnet variable stiffness unit is suspended through the hollow sleeve;

[0015] When the electromagnet-spring-electromagnet variable stiffness unit moves horizontally relative to the hollow sleeve, the two electromagnets begin to cut the magnetic flux lines generated by the double-pass conductive plate, thereby generating an induced electromotive force inside the electromagnet, while increasing, decreasing or even changing the magnetism of the electromagnet. The attraction or repulsion between the electromagnet-spring-electromagnet variable stiffness unit and the left and right magnetic supports changes continuously with the vibration of the electromagnet-spring-electromagnet variable stiffness unit, forming a variable stiffness.

[0016] The preload spring between the two electromagnets is connected in series with the electromagnets, and the force of the preload spring increases the relative deformation between the two electromagnets, that is, increases the deformation of the negative stiffness;

[0017] In addition, the double-pass magnetic conductivity plate on the hollow sleeve and the electromagnet-spring-electromagnet variable stiffness unit also form an eddy current damping energy dissipation mechanism. The movement of the electromagnet cuts the magnetic flux lines to generate an eddy current field. The Lorentz force generated by the interaction between the eddy current and the magnetic field will hinder the relative movement between the electromagnet and the magnetic field. At the same time, the eddy current will be converted into heat energy dissipation in the electromagnet, further increasing the stability and damping energy dissipation of the horizontal relative movement of the electromagnet-spring-electromagnet variable stiffness unit.

[0018] As a preferred technical solution, the direction, magnitude and frequency of the current in the energized conductive plate on the hollow sleeve are controlled so that the unit cell can achieve flexible changes in positive stiffness, negative stiffness and quasi-zero stiffness. By changing the current in the energized conductive plate, the stiffness characteristics between the electromagnets are changed, further affecting the seismic isolation efficiency and damping.

[0019] Further, the electromagnet-spring-electromagnet variable stiffness unit includes a first electromagnet, a second electromagnet, a first pre-stress spring and a second pre-stress spring, and the inner ends of the first electromagnet and the second electromagnet are connected by the first pre-stress spring and the second pre-stress spring to form an electromagnet-spring-electromagnet variable stiffness unit, and the first pre-stress spring and the second pre-stress spring are connected in parallel.

[0020] Furthermore, the first electromagnet and the second electromagnet are both connected to the magnetic support via an oblique spring and a horizontal spring, and the oblique spring and the horizontal spring are connected in parallel;

[0021] The oblique spring and horizontal spring connecting the electromagnet and the magnetic support are connected in parallel, and at the same time are connected in series with the electromagnet-spring-electromagnet variable stiffness unit, which not only limits the vertical displacement of the electromagnet-spring-electromagnet variable stiffness unit from being too large, but also increases the diversity of the stiffness adjustment mechanism.

[0022] Furthermore, the auxiliary stiffness adjustment member includes a first magnetic support, a second magnetic support and a hollow sleeve.

[0023] The outer end of the first electromagnet is connected to the first magnetic support through a first oblique spring, a first horizontal spring and a second oblique spring, the first oblique spring, the first horizontal spring and the second oblique spring are connected in parallel, and the first oblique spring and the second oblique spring are symmetrically arranged with respect to the first horizontal spring.

[0024] The outer end of the second electromagnet is connected to the second magnetic support through a third oblique spring, a second horizontal spring and a fourth oblique spring. The third oblique spring, the second horizontal spring and the fourth oblique spring are connected in parallel. The third oblique spring and the fourth oblique spring are symmetrically arranged about the second horizontal spring.

[0025] Furthermore, limiting slide rails are arranged on both sides of the hollow sleeve, and both ends of the limiting slide rails are respectively connected to the magnetic supports through connecting springs, so that the hollow sleeve moves relative to the electromagnet-spring-electromagnet variable stiffness unit along the direction of the limiting slide rails.

[0026] Furthermore, the first limiting slide rail and the second limiting slide rail are fixedly connected to opposite sides of the hollow sleeve.

[0027] One end of the first limit slide rail is connected to the first magnetic support through a first connecting spring, and the other end is connected to the second magnetic support through a second connecting spring.

[0028] One end of the second limiting slide rail is connected to the first magnetic support via a third connecting spring, and the other end is connected to the second magnetic support via a fourth connecting spring.

[0029] Furthermore, the magnetic poles of the first magnetic support, the original magnetic poles of the first electromagnet, the original magnetic poles of the second electromagnet and the magnetic poles of the second magnetic support are opposite to each other, that is, the unit cell is initially a negative stiffness system.

[0030] Furthermore, the stiffness adjustment and eddy current damping energy-absorbing component includes a first current-carrying conductive plate, a second current-carrying conductive plate, a first magnetic conductive plate and a second magnetic conductive plate, and the two side surfaces of the hollow sleeve are fixedly connected with the first current-carrying conductive plate and the second current-carrying conductive plate, and the other adjacent two side surfaces are fixedly connected with the first magnetic conductive plate and the second magnetic conductive plate.

[0031] As a preferred technical solution, the diameter of the hollow sleeve is slightly larger than the height and width of the electromagnet, so that the electromagnet-spring-electromagnet variable stiffness unit is located in the hollow sleeve without contacting or squeezing the hollow sleeve from top, bottom, left and right.

[0032] As a preferred technical solution, the magnetic field in the two current-carrying conductive plates is adjusted by adjusting the direction, magnitude and frequency of the current in the current-carrying conductive plate, so that the unit cell exhibits enhanced negative stiffness, suppressed negative stiffness or quasi-zero stiffness. In addition, the magnetic field strength will affect the ability of eddy currents to damp energy dissipation, thereby affecting the damping ratio of the unit cell.

[0033] One of the technical solutions of the present invention is to provide a method for nonlinearly changing the stiffness of an electromagnet, which adopts the unit cell to change the stiffness, and comprises the following steps:

[0034] When the unit cell is working, the first electromagnet and the second electromagnet form an electromagnet-spring-electromagnet variable stiffness unit through a preload spring and a hollow sleeve with an additional current conducting plate and a magnetic conducting plate to undergo relative horizontal displacement;

[0035] The energized conductive plate generates a magnetic field inside the hollow sleeve, and the relative horizontal movement of the electromagnet-spring-electromagnet variable stiffness unit cuts the magnetic flux lines, and the first electromagnet and the second electromagnet inside the electromagnet-spring-electromagnet variable stiffness unit generate an induced electromotive force, and then generate an induced current, so that the magnetic properties of the first electromagnet and the second electromagnet change;

[0036] S1. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet and the second electromagnet to generate a magnetic field dominated by the original magnetic pole, the magnetism of the first electromagnet and the second electromagnet will be greater than when no power is applied, and at this time the unit cell presents a synergistic negative stiffness;

[0037] S2. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet and the second electromagnet to generate magnetic fields with partially opposite original magnetic poles, and the generated induced magnetic field does not exceed the magnetic field of the first electromagnet and the second electromagnet themselves, then the magnetism of the first electromagnet and the second electromagnet is smaller than when no power is applied, and at this time the unit cell presents suppressed negative stiffness;

[0038] S3. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet and the second electromagnet to generate magnetic fields with partially opposite original magnetic poles, and the generated induced magnetic field just reaches the magnetic field of the first electromagnet and the second electromagnet themselves, the magnetism of the first electromagnet and the second electromagnet disappears temporarily, and at this time the unit cell presents quasi-zero stiffness;

[0039] S4. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet and the second electromagnet to generate a magnetic field dominated by opposite original magnetic poles, and the generated induced magnetic field exceeds the magnetic field of the first electromagnet and the second electromagnet themselves, the magnetism of the first electromagnet and the second electromagnet will temporarily change, and the unit cell will exhibit positive stiffness.

[0040] One of the technical solutions of the present invention is to provide a metamaterial vibration isolation support, which includes a vibration reduction module and an end plate. In the length direction, a plurality of end plates are connected in series through the vibration reduction module, and the vibration reduction module includes a plurality of unit cells in parallel array;

[0041] The end plate comprises a first support plate, a second support plate and a damping coating, the two support plates have sufficient rigidity, a damping coating is coated between the first support plate and the second support plate, the damping coating has a certain sliding property, and the existence of the damping coating enables the support to have vibration isolation and energy dissipation capabilities in the horizontal direction;

[0042] When each unit cell in the vibration reduction module is externally excited, the first electromagnet and the second electromagnet in a single unit cell start to move, and three stiffness change states can be generated according to the size, direction and frequency of the current passed through the energized conductive plate;

[0043] When external excitation persists, the nonlinear strength, negative stiffness ratio, damping ratio and other parameters of the unit cell are adjusted according to different structures, so that all the unit cells of a single vibration reduction module can form a local resonance type electromagnetic nonlinear variable stiffness oscillator element, broaden the frequency band range of the vibration attenuation zone (bandgap), and reduce the center frequency of the bandgap, so that the frequency of the vibration attenuation zone is reduced to a frequency close to the low-frequency band of the seismic wave, effectively suppressing the propagation of seismic waves based on the electromagnetic damping energy consumption and low-frequency bandgap mechanism and achieving rapid attenuation of the peak value, thereby obtaining a low-bandwidth vibration isolation effect.

[0044] As a preferred technical solution, by changing the direction of the unit cells in each vibration isolation module, such as making all the unit cell directions in an odd-layer vibration reduction module (the unit cell axis is parallel to the x-axis) orthogonal to all the unit cell directions in an even-layer vibration reduction module (the unit cell axis is parallel to the y-axis), or making the unit cell directions in each layer of vibration reduction module different, or making the unit cell directions in a single-layer vibration reduction module different, multi-directional enhanced bandgap broadening and damping can be achieved, thereby realizing multi-dimensional metamaterial enhanced vibration isolation that is different from the traditional vibration isolation support technology route.

[0045] As a preferred technical solution, the single layer of the support includes two end plates and a vibration reduction module, and the first magnetic support and the second magnetic support of the unit cell are fixedly connected to the first support plate and the second support plate belonging to the two end plates respectively.

[0046] Furthermore, in the length direction, the multiple end plates are connected in series via support springs, and the multiple unit cells and support springs are connected in parallel to form an array.

[0047] As a preferred technical solution, both ends of the support spring are fixedly connected to a first support plate and a second support plate belonging to two end plates respectively.

[0048] As a preferred technical solution, in the width direction, the unit cells and the supporting springs are arranged in an array with intervals, and in the thickness direction, the unit cells and the supporting springs are arranged in an equidistant array, so as to form a multi-element stiffness adjustment mechanism in which the unit cells are connected in parallel with the springs.

[0049] One of the technical solutions of the present invention is to provide a metamaterial vibration isolation method, which uses the support to perform vibration isolation, comprising the following steps:

[0050] When external excitation occurs, multiple unit cells in the vibration reduction module begin to vibrate. Due to the different relative positions of the unit cells in the vibration reduction module, the vibrations caused by the external excitation are different, and the dynamic characteristics and stiffness change amplitudes of each unit cell are also different. The vibrations of each unit cell affect each other, forming a good low-frequency elastic wave band gap and wave guide characteristics to isolate the low-frequency vibrations generated by the earthquake.

[0051] In the length direction, the vibration reduction modules at different positions are also controlled by external excitation. The stiffness and frequency of each vibration reduction module are different. At the same time, due to the slidability of the end plate, the stiffness and frequency of adjacent vibration reduction modules affect each other, further realizing the control of low-frequency waves and suppressing large deformation while achieving negative stiffness.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] (1) In the proposed unit cell, the present invention uses an electromagnet-spring-electromagnet variable stiffness unit to realize the controllable and adjustable time-varying stiffness based on the electromagnetic time-varying mechanism. In the traditional vibration isolation system, the nonlinear stiffness generated by the system component unit usually has only one direction, that is, positive stiffness, negative stiffness or quasi-zero stiffness. The present invention can effectively change the magnitude of the magnetic force at both ends of the electromagnet-spring-electromagnet variable stiffness unit or change the magnetism by controlling the magnitude, direction and frequency of the current in the energized conductive plate attached to the hollow sleeve, and can even generate alternating magnetism by passing an alternating current as required, thereby forming a positive stiffness, negative stiffness and quasi-zero stiffness system with adjustable vibration isolation efficiency and damping with a magnetic support with constant magnetism.

[0054] (2) The present invention utilizes the property that spring stiffness is easy to adjust, and sets a preload spring between the electromagnets to form an electromagnet-spring-electromagnet variable stiffness unit; the preload spring can promote the vibration of the electromagnet-spring-electromagnet variable stiffness unit when horizontal relative motion occurs, accelerate the rate of effective cutting of magnetic flux lines, and increase the sensitivity of the vibration isolation system to small relative displacement while shortening the time for effective stiffness formation; the two electromagnets are connected in series, and a negative stiffness unit is added inside the electromagnet-spring-electromagnet variable stiffness unit to increase the diversity of the stiffness adjustment mechanism; the two ends of the electromagnet-spring-electromagnet variable stiffness unit are connected to the magnetic support by springs, and the variable stiffness is connected in series with the parallel spring stiffness, thereby increasing the diversity of the stiffness adjustment mechanism and ensuring that the unit cell has a certain energy dissipation and vibration reduction effect when not powered on;

[0055] (3) The present invention utilizes the characteristics of eddy current damping adaptive adjustment, so that the unit cell can provide considerable adaptive energy consumption according to the characteristics of the electromagnet-spring-electromagnet variable stiffness unit movement, while reducing the influence of the self-vibration of the electromagnet-spring-electromagnet variable stiffness unit on the vibration isolation structure;

[0056] (4) The present invention realizes a nonlinear variable stiffness unit based on an electromagnet-spring-electromagnet; provides a nonlinear damping unit in the form of a magnetically conductive plate-electromagnet; realizes nonlinear multivariate stiffness adjustment by combining an electromagnet-spring-magnetic support in series and parallel, and realizes adaptive band gap adjustment and vibration reduction enhancement effect based on displacement amplitude, which is conducive to realizing adaptive metamaterial-type enhanced vibration isolation of engineering and mechanical structures under multi-level and multi-source excitation;

[0057] (5) In the vibration isolation support proposed by the present invention, based on the different dynamic characteristics and stiffness change amplitudes of unit cells at different positions under external excitation, the different frequency and stiffness characteristics of each vibration reduction module under the influence of different internal unit cell dynamic characteristics and stiffness, and the mutual influence of vibrations of each unit cell, the movement of adjacent vibration reduction modules, thus forming a good low-frequency broadened elastic wave band gap, electromagnetic damping energy dissipation and wave guiding characteristics to isolate the low-frequency vibration generated by earthquakes and suppress vibration peaks, thereby realizing multi-dimensional adaptive metamaterial-type synergistic vibration isolation while avoiding the need for large deformation vibration isolation belts concentrated on traditional flexible vibration isolation layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the front view structure of the electromagnet nonlinear variable stiffness unit cell in an embodiment of the present invention;

[0059] Figure 2 It is a schematic diagram of the front perspective structure of the electromagnet nonlinear variable stiffness unit cell in an embodiment of the present invention;

[0060] Figure 31-1 is a schematic diagram of the cross-sectional structure of the electromagnet nonlinear variable stiffness unit cell in an embodiment of the present invention;

[0061] Figure 4 It is a schematic diagram of the detailed structure of the end plate in the embodiment of the present invention;

[0062] Figure 5 It is a schematic diagram of the side view structure of a single layer of a metamaterial vibration isolation support in an embodiment of the present invention;

[0063] Figure 6 Schematic diagram of the three-dimensional structure of two layers of the metamaterial vibration isolation support in an embodiment of the present invention.

[0064] Description of the markings in the figure:

[0065] 1—first magnetic support, 2—second magnetic support, 3—first limiting slide rail, 4—second limiting slide rail, 5—first electromagnet, 6—second electromagnet, 7—first current-carrying conductive plate, 8—second current-carrying conductive plate, 9—first magnetic conductive plate, 10—second magnetic conductive plate, 11—first oblique spring, 12—first horizontal spring, 13—second oblique spring, 14—first pre-compression spring, 15—second pre-compression spring, 16—third oblique spring, 17—second horizontal spring, 18—fourth oblique spring, 19—hollow sleeve, 20—first connecting spring, 21—second connecting spring, 22—third connecting spring, 23—fourth connecting spring, 24—first support plate, 25—second support plate, 26—damping coating, 27—support spring. DETAILED DESCRIPTION

[0066] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0067] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, which only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other way.

[0068] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] Example:

[0070] An electromagnet nonlinear variable stiffness unit cell, such as Figures 1 to 3 As shown, it includes an electromagnet-spring-electromagnet variable stiffness unit, an auxiliary stiffness adjustment component, a stiffness adjustment and eddy current damping energy dissipation component,

[0071] The electromagnet-spring-electromagnet variable stiffness unit comprises a first electromagnet 5, a second electromagnet 6 and a preload spring, wherein the first electromagnet 5 and the second electromagnet 6 are connected via the preload spring.

[0072] The auxiliary stiffness adjustment component includes a magnetic support and a hollow sleeve 19. The electromagnet is connected to the magnetic support through a spring.

[0073] The stiffness adjustment and eddy current damping energy dissipation component includes a current conducting plate and a magnetic conducting plate. The current conducting plate and the magnetic conducting plate are arranged at intervals on the hollow sleeve 19. The electromagnet-spring-electromagnet variable stiffness unit is suspended through the hollow sleeve 19.

[0074] By controlling the direction, magnitude and frequency of the current in the conductive plate on the hollow sleeve 19, the unit cell can achieve flexible changes in positive stiffness, negative stiffness and quasi-zero stiffness. By changing the current in the conductive plate, the stiffness characteristics between the electromagnets are changed, further affecting the seismic isolation efficiency and damping.

[0075] When the electromagnet-spring-electromagnet variable stiffness unit moves horizontally relative to the hollow sleeve 19, the two electromagnets begin to cut the magnetic flux lines generated by the double-pass conductive plate, thereby generating an induced electromotive force inside the electromagnet, which can simultaneously increase, reduce or even change the magnetism of the electromagnet. The attraction or repulsion between the electromagnet-spring-electromagnet variable stiffness unit and the left and right magnetic supports changes continuously with the vibration of the electromagnet-spring-electromagnet variable stiffness unit, forming a variable stiffness.

[0076] The preload spring between the two electromagnets is connected in series with the electromagnets, and the force of the preload spring can increase the relative deformation between the two electromagnets, that is, increase the deformation of the negative stiffness;

[0077] In addition, the double-pass magnetic permeability plate on the hollow sleeve 19 and the electromagnet-spring-electromagnet variable stiffness unit can also form an eddy current damping energy dissipation mechanism. The electromagnet moves to cut the magnetic flux lines to generate an eddy current field. The Lorentz force generated by the interaction between the eddy current and the magnetic field will hinder the relative movement between the electromagnet and the magnetic field. At the same time, the eddy current will be converted into heat energy dissipation in the electromagnet, further increasing the stability and damping energy dissipation of the horizontal relative movement of the electromagnet-spring-electromagnet variable stiffness unit.

[0078] The electromagnet-spring-electromagnet variable stiffness unit comprises a first electromagnet 5, a second electromagnet 6, a first pre-compression spring 14 and a second pre-compression spring 15. The inner ends of the first electromagnet 5 and the second electromagnet 6 are connected by the first pre-compression spring 14 and the second pre-compression spring 15 to form an electromagnet-spring-electromagnet variable stiffness unit. The first pre-compression spring 14 and the second pre-compression spring 15 are connected in parallel.

[0079] The first electromagnet 5 and the second electromagnet 6 are both connected to the magnetic support through an oblique spring and a horizontal spring, and the oblique spring and the horizontal spring are connected in parallel;

[0080] The oblique spring and the horizontal spring connecting the electromagnet and the magnetic support are connected in parallel, and are connected in series with the electromagnet-spring-electromagnet variable stiffness unit, which not only limits the vertical displacement of the electromagnet-spring-electromagnet variable stiffness unit from being too large, but also increases the diversity of the stiffness adjustment mechanism;

[0081] The auxiliary stiffness adjustment component includes a first magnetic support 1, a second magnetic support 2 and a hollow sleeve 19.

[0082] The outer end of the first electromagnet 5 is connected to the first magnetic support 1 through the first oblique spring 11, the first horizontal spring 12 and the second oblique spring 13. The first oblique spring 11, the first horizontal spring 12 and the second oblique spring 13 are connected in parallel. The first oblique spring 11 and the second oblique spring 13 are symmetrically arranged about the first horizontal spring 12.

[0083] The outer end of the second electromagnet 6 is connected to the second magnetic support 2 through the third oblique spring 16, the second horizontal spring 17 and the fourth oblique spring 18, the third oblique spring 16, the second horizontal spring 17 and the fourth oblique spring 18 are connected in parallel, and the third oblique spring 16 and the fourth oblique spring 18 are symmetrically arranged about the second horizontal spring 17;

[0084] Limiting rails are arranged on both sides of the hollow sleeve 19, and the two ends of the limiting rails are connected to the magnetic supports through connecting springs, so that the hollow sleeve 19 can move relative to the electromagnet-spring-electromagnet variable stiffness unit along the direction of the limiting rails;

[0085] The first limiting slide rail 3 and the second limiting slide rail 4 are fixedly connected to opposite sides of the hollow sleeve 19.

[0086] One end of the first limiting slide rail 3 is connected to the first magnetic support 1 through a first connecting spring 20, and the other end is connected to the second magnetic support 2 through a second connecting spring 21.

[0087] One end of the second limiting slide rail 4 is connected to the first magnetic support 1 through the third connecting spring 22, and the other end is connected to the second magnetic support 2 through the fourth connecting spring 23;

[0088] The magnetic pole of the first magnetic support 1 is selected as N (S) pole, and the magnetic pole of the second magnetic support 2 is selected as S (N) pole;

[0089] The original magnetic pole of the first electromagnet 5 is selected as the S (N) pole, and the original magnetic pole of the second electromagnet 6 is selected as the N (S) pole, that is, the unit cell is initially a negative stiffness system;

[0090] The stiffness adjustment and eddy current damping energy dissipation component comprises a first current conducting plate 7, a second current conducting plate 8, a first magnetic conducting plate 9 and a second magnetic conducting plate 10. The two sides of the hollow sleeve 19 are fixedly connected with the first current conducting plate 7 and the second current conducting plate 8, and the other two adjacent sides are fixedly connected with the first magnetic conducting plate 9 and the second magnetic conducting plate 10.

[0091] The first current conducting plate 7 and the second current conducting plate 8 have different magnetic properties, thereby forming a vertical downward magnetic field, and a horizontal rightward magnetic field exists between the first magnetic conducting plate 9 and the second magnetic conducting plate 10;

[0092] The diameter of the hollow sleeve 19 is slightly larger than the height and width of the electromagnet, so that the electromagnet-spring-electromagnet variable stiffness unit is located in the hollow sleeve 19 and its top, bottom, left and right are not in contact with or squeezed by the hollow sleeve 19;

[0093] By adjusting the direction, magnitude and frequency of the current in the energized conductive plate, the magnetic field in the two energized conductive plates is adjusted, so that the unit cell exhibits enhanced negative stiffness, suppressed negative stiffness or quasi-zero stiffness. In addition, the magnetic field strength will affect the ability of eddy currents to damp energy dissipation, thereby affecting the damping ratio of the unit cell.

[0094] In this embodiment, the material of the magnetic support and the magnetic conductive plate is steel magnetic plate, the material of the limiting slide rail and the hollow sleeve 19 is steel, the material of the electromagnet and the spring (oblique spring, horizontal spring, pre-stressed spring and connecting spring) is carbon steel, and the material of the current conductive plate is copper plate.

[0095] A nonlinear variable stiffness method for an electromagnet uses the above-mentioned unit cell to vary stiffness, and the specific steps are as follows:

[0096] When the unit cell is working, the first electromagnet 5 and the second electromagnet 6 form an electromagnet-spring-electromagnet variable stiffness unit through the first pre-compression spring 14 and the second pre-compression spring 15 and a hollow sleeve 19 attached with the first and second current conducting plates 7 and 8 and the first and second magnetic conducting plates 9 and 10 to undergo relative horizontal displacement;

[0097] The first conductive plate 7 and the second conductive plate 8 generate a magnetic field inside the hollow sleeve 19, and the relative horizontal movement of the electromagnet-spring-electromagnet variable stiffness unit cuts the magnetic flux lines, and the first electromagnet 5 and the second electromagnet 6 inside the electromagnet-spring-electromagnet variable stiffness unit generate an induced electromotive force, and then generate an induced current, so that the magnetic properties of the first electromagnet 5 and the second electromagnet 6 change;

[0098] S1. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet 5 to generate a magnetic field dominated by the S pole and the second electromagnet 6 to generate a magnetic field dominated by the N pole, then the magnetism of the first electromagnet 5 and the second electromagnet 6 is greater than when no power is applied, and at this time the unit cell presents a synergistic negative stiffness;

[0099] S2. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet 5 to generate a magnetic field of part of the N pole and the second electromagnet 6 to generate a magnetic field of part of the S pole, and the generated induced magnetic field does not exceed the magnetic field of the first electromagnet 5 and the second electromagnet 6, then the magnetism of the first electromagnet 5 and the second electromagnet 6 is smaller than when not energized, and at this time the unit cell presents a suppressed negative stiffness;

[0100] S3. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet 5 to generate a partial N-pole magnetic field and the second electromagnet 6 to generate a partial S-pole magnetic field, and the generated induced magnetic field just reaches the magnetic field of the first electromagnet 5 and the second electromagnet 6, then the magnetism of the first electromagnet 5 and the second electromagnet 6 disappears temporarily, and at this time the unit cell presents quasi-zero stiffness;

[0101] S4. After the conductive plate is energized to generate an induced magnetic field, if the electromotive force generated by the movement of the electromagnet-spring-electromagnet variable stiffness unit causes the first electromagnet 5 to generate a magnetic field dominated by the N pole and the second electromagnet 6 to generate a magnetic field dominated by the S pole, and the generated induced magnetic field exceeds the magnetic field of the first electromagnet 5 and the second electromagnet 6 themselves, the magnetism of the first electromagnet 5 and the second electromagnet 6 will temporarily change, and the unit cell will exhibit positive stiffness.

[0102] A metamaterial vibration isolation support, such as Figures 4 to 6As shown, it includes n vibration reduction modules and n+1 end plates. In the length direction, the multiple end plates are connected in series through the vibration reduction modules. The vibration reduction modules include multiple parallel arrays of the above-mentioned unit cells.

[0103] The end plate includes a first support plate 24, a second support plate 25 and a damping coating 26. The two support plates have sufficient rigidity. A damping coating 26 is coated between the first support plate 24 and the second support plate 25. The damping coating has a certain sliding property. The existence of the damping coating enables the support to have vibration isolation and energy dissipation capabilities in the horizontal direction.

[0104] When each unit cell in the vibration reduction module is externally excited, the first electromagnet 5 and the second electromagnet 6 in a single unit cell start to move, and three stiffness change states can be generated according to the size, direction and frequency of the current passed through the energized conductive plate;

[0105] When external excitation persists, the nonlinear strength, negative stiffness ratio, damping ratio and other parameters of the unit cell are adjusted according to different structures, so that all the unit cells of a single vibration reduction module can form a local resonance type electromagnetic nonlinear variable stiffness oscillator element, broaden the frequency band of the vibration attenuation zone (bandgap), and reduce the center frequency of the bandgap, so that the frequency of the vibration attenuation zone is reduced to a frequency close to the low-frequency band of the seismic wave, effectively suppress the propagation of seismic waves based on electromagnetic damping energy consumption and low-frequency bandgap mechanism and achieve rapid attenuation of peak values, thereby obtaining a low-bandwidth vibration isolation effect;

[0106] By changing the direction of the unit cells in each vibration isolation module, such as making all the unit cell directions in the odd-layer vibration isolation module (the unit cell axis is parallel to the x-axis) orthogonal to all the unit cell directions in the even-layer vibration isolation module (the unit cell axis is parallel to the y-axis), or making the unit cell directions in each layer of vibration isolation module different, or making the unit cell directions in a single layer of vibration isolation module different, multi-directional enhanced bandgap broadening and damping can be achieved, thereby realizing multi-dimensional metamaterial enhanced vibration isolation that is different from the traditional vibration isolation support technology route;

[0107] The single layer of the support includes two end plates and a vibration reduction module, and the first magnetic support 1 and the second magnetic support 2 of the unit cell are respectively fixedly connected to the first support plate 24 and the second support plate 25 belonging to the two end plates;

[0108] In the length direction, the multiple end plates are connected in series through the support springs 27, and the multiple unit cells and the support springs 27 are connected in parallel array;

[0109] Both ends of the support spring 27 are fixedly connected to the first support plate 24 and the second support plate 25 belonging to the two end plates respectively;

[0110] In the width direction, the unit cells and the supporting springs 27 are arranged in an array with intervals, and in the thickness direction, the unit cells and the supporting springs 27 are arranged in an array with equal distances, so as to form a multi-element stiffness adjustment mechanism in which the unit cells are connected in parallel with the springs.

[0111] In this embodiment, the support plate 25 is made of steel plate to ensure that the support plate 25 has sufficient rigidity, the damping coating is made of polyacrylate coating to ensure that the damping coating has a certain sliding property, and the support spring 27 is made of carbon steel.

[0112] A metamaterial vibration isolation method, using the above-mentioned support for vibration isolation, the specific steps are as follows:

[0113] When external excitation occurs, multiple unit cells in the vibration reduction module begin to vibrate. Due to the different relative positions of the unit cells in the vibration reduction module, the vibrations caused by the external excitation are different, and the dynamic characteristics and stiffness change amplitudes of each unit cell are also different. The vibrations of each unit cell affect each other, forming a good low-frequency elastic wave band gap and wave guide characteristics to isolate the low-frequency vibrations generated by the earthquake.

[0114] In the length direction, the vibration reduction modules at different positions are also controlled by external excitation. The stiffness and frequency of each vibration reduction module are different. At the same time, due to the slidability of the end plate, the stiffness and frequency of adjacent vibration reduction modules affect each other, further realizing the control of low-frequency waves and suppressing large deformation while achieving negative stiffness.

[0115] In the proposed unit cell, the present invention uses an electromagnet-spring-electromagnet variable stiffness unit to realize the controllable and adjustable time-varying stiffness based on the electromagnetic time-varying mechanism; in the traditional vibration isolation system, the nonlinear stiffness generated by the system component unit usually has only one direction, that is, positive stiffness, negative stiffness or quasi-zero stiffness; the present invention can effectively change the magnitude of the magnetic force at both ends of the electromagnet-spring-electromagnet variable stiffness unit or change the magnetism by controlling the magnitude, direction and frequency of the current in the energized conductive plate attached to the hollow sleeve, and can even generate alternating magnetism by passing an alternating current as required, and form a positive stiffness, negative stiffness and quasi-zero stiffness system with adjustable vibration isolation efficiency and damping with a magnetic support with constant magnetism;

[0116] The present invention utilizes the characteristics of eddy current damping adaptive adjustment, so that the unit cell can provide considerable adaptive energy consumption according to the characteristics of the electromagnet-spring-electromagnet variable stiffness unit movement, while reducing the influence of the self-vibration of the electromagnet-spring-electromagnet variable stiffness unit on the vibration isolation structure;

[0117] In the vibration isolation bearing proposed in the present invention, based on the different dynamic characteristics and stiffness change amplitudes of unit cells at different positions under external excitation, the different frequency and stiffness characteristics of each vibration reduction module under the influence of different internal unit cell dynamic characteristics and stiffness, and the mutual influence of vibrations of each unit cell, the movement of adjacent vibration reduction modules, a good low-frequency broadened elastic wave band gap, electromagnetic damping energy dissipation and wave guiding characteristics are formed to isolate the low-frequency vibration generated by earthquakes and suppress vibration peaks, thereby realizing multi-dimensional adaptive metamaterial-type synergistic vibration isolation while avoiding the need for large deformation vibration isolation belts concentrated on traditional flexible vibration isolation layers.

[0118] The unit cell of the present invention realizes a dual magnet-spring multi-element stiffness adjustment mechanism with an electromagnet as the core of the variable stiffness unit, and forms a stiffness adjustment element based on a dual magnet nonlinear variable stiffness structure formed by an electromagnet-spring-electromagnet variable stiffness unit and a dual magnetic support, an adaptive series stiffness adjustment element inside the electromagnet-spring-electromagnet variable stiffness unit, a limit and parallel stiffness adjustment element inside the stiffness structure formed by an electromagnet-spring-magnetic support, and a nonlinear damping element based on eddy current damping with a magnetic guide plate-electromagnet as the core. The positive stiffness, negative stiffness and quasi-zero stiffness of the dual-magnet nonlinear stiffness adjustment element are artificially adjustable. Springs and eddy current damping are added to realize stiffness adjustment mechanisms with series, parallel, adaptive and nonlinear characteristics, achieving adaptive vibration isolation based on nonlinear variable stiffness adjustment, that is, providing an enhanced dual-magnet system, spring and eddy current damping series and parallel nonlinear joint control force under large displacement and high acceleration control requirements, realizing adaptive vibration isolation of engineering and mechanical structures under multi-level and multi-source excitation, and solving the design contradiction between deformation control of the vibration isolation layer and vibration isolation efficiency.

[0119] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An electromagnet nonlinear variable stiffness unit cell, characterized in that: The unit cell includes an electromagnet-spring-electromagnet variable stiffness unit, an auxiliary stiffness adjustment component, a stiffness adjustment and eddy current damping energy dissipation component, The electromagnet-spring-electromagnet variable stiffness unit comprises a first electromagnet (5), a second electromagnet (6) and a preload spring, wherein the first electromagnet (5) and the second electromagnet (6) are connected via the preload spring. The auxiliary stiffness adjustment component comprises a magnetic support and a hollow sleeve (19), wherein the electromagnet is connected to the magnetic support via a spring. The stiffness adjustment and eddy current damping energy dissipation component comprises a current conducting plate and a magnetic conducting plate, the current conducting plate and the magnetic conducting plate are arranged at intervals on the hollow sleeve (19), and the electromagnet-spring-electromagnet variable stiffness unit is suspended through the hollow sleeve (19).

2. The electromagnet nonlinear variable stiffness unit cell according to claim 1, characterized in that: The electromagnet-spring-electromagnet variable stiffness unit comprises a first electromagnet (5), a second electromagnet (6), a first pre-compression spring (14) and a second pre-compression spring (15); the inner ends of the first electromagnet (5) and the second electromagnet (6) are connected via the first pre-compression spring (14) and the second pre-compression spring (15); the first pre-compression spring (14) and the second pre-compression spring (15) are connected in parallel.

3. The electromagnet nonlinear variable stiffness unit cell according to claim 1, characterized in that: The first electromagnet (5) and the second electromagnet (6) are both connected to the magnetic support via an oblique spring and a horizontal spring, and the oblique spring and the horizontal spring are connected in parallel.

4. The electromagnet nonlinear variable stiffness unit cell according to claim 3, characterized in that: The auxiliary stiffness adjustment component comprises a first magnetic support (1), a second magnetic support (2) and a hollow sleeve (19). The outer end of the first electromagnet (5) is connected to the first magnetic support (1) via a first oblique spring (11), a first horizontal spring (12) and a second oblique spring (13); the first oblique spring (11), the first horizontal spring (12) and the second oblique spring (13) are connected in parallel; the first oblique spring (11) and the second oblique spring (13) are symmetrically arranged with respect to the first horizontal spring (12); The outer end of the second electromagnet (6) is connected to the second magnetic support (2) via a third oblique spring (16), a second horizontal spring (17) and a fourth oblique spring (18); the third oblique spring (16), the second horizontal spring (17) and the fourth oblique spring (18) are connected in parallel; the third oblique spring (16) and the fourth oblique spring (18) are symmetrically arranged with respect to the second horizontal spring (17).

5. The electromagnet nonlinear variable stiffness unit cell according to claim 4, characterized in that: Limiting slide rails are arranged on both sides of the hollow sleeve (19), and both ends of the limiting slide rails are connected to the magnetic support through connecting springs.

6. The electromagnet nonlinear variable stiffness unit cell according to claim 5, characterized in that: The first limiting slide rail (3) and the second limiting slide rail (4) are fixedly connected oppositely to each other on two sides of the hollow sleeve (19). One end of the first limiting slide rail (3) is connected to the first magnetic support (1) via a first connecting spring (20), and the other end is connected to the second magnetic support (2) via a second connecting spring (21). One end of the second limiting slide rail (4) is connected to the first magnetic support (1) via a third connecting spring (22), and the other end is connected to the second magnetic support (2) via a fourth connecting spring (23).

7. The electromagnet nonlinear variable stiffness unit cell according to claim 4, characterized in that: The magnetic poles of the first magnetic support (1), the original magnetic poles of the first electromagnet (5), the original magnetic poles of the second electromagnet (6) and the magnetic poles of the second magnetic support (2) are opposite to each other.

8. The electromagnet nonlinear variable stiffness unit cell according to claim 1, characterized in that: The stiffness adjustment and eddy current damping energy dissipation component comprises a first current conducting plate (7), a second current conducting plate (8), a first magnetic conducting plate (9) and a second magnetic conducting plate (10); two side surfaces of the hollow sleeve (19) are fixedly connected to the first current conducting plate (7) and the second current conducting plate (8); and the other adjacent two side surfaces are fixedly connected to the first magnetic conducting plate (9) and the second magnetic conducting plate (10).

9. A metamaterial vibration isolation support, characterized in that: The support comprises a vibration reduction module and an end plate, a plurality of end plates are connected in series through the vibration reduction module, and the vibration reduction module comprises a plurality of unit cell parallel arrays as claimed in any one of claims 1 to 8; The end plate comprises a first support plate (24), a second support plate (25) and a damping coating (26), wherein the damping coating (26) is coated between the first support plate (24) and the second support plate (25).

10. The metamaterial vibration isolation support according to claim 9, characterized in that: The multiple end plates are also connected in series via support springs (27), and the multiple unit cells and support springs (27) are connected in parallel to form an array.

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