Low-frequency vibration isolation device with square cross-section, mimicking a seahorse exoskeleton and magnetic negative stiffness coupling.

Abstract

This invention relates to low-frequency biomimetic vibration isolation devices, specifically a novel seahorse exoskeleton-inspired square cross-section magnetic negative stiffness coupled vibration isolation device. The aim is to provide a novel seahorse exoskeleton-inspired square cross-section magnetic negative stiffness coupled low-frequency vibration isolation device that possesses vibration isolation functionality, achieves a more robust vibration isolation effect in low-frequency vibrations, and exhibits more efficient energy absorption characteristics. The technical solution is a novel seahorse exoskeleton-inspired square cross-section magnetic negative stiffness coupled low-frequency vibration isolation device, characterized in that: the device includes a top plate and a bottom plate arranged horizontally and correspondingly, a central rotating mechanism positioned between the top and bottom plates, and vertical guide mechanisms located on the left and right sides of the central rotating mechanism, connecting the top and bottom plates respectively.

Description

Technical Field

[0001] This invention relates to a low-frequency biomimetic vibration isolation device, specifically a novel square-section, magnetically negative stiffness coupled vibration isolation device that mimics a seahorse exoskeleton. Background Technology

[0002] As high-end equipment in fields such as aerospace gradually becomes larger and lighter, low-frequency vibrations induced by complex excitations seriously affect the reliability, stability, and accuracy of these equipment. While traditional vibration isolators offer simple configurations, high reliability, and good stability, they cannot guarantee load-bearing capacity in low-frequency vibration isolation, presenting a trade-off. Biomimetic vibration isolation is a novel low-frequency nonlinear vibration isolation technology. It designs biomimetic vibration isolation structures by simulating the motion stability and buffering capacity under complex motion of organisms in nature. For example, the biomimetic X-shaped vibration isolation structure can obtain beneficial equivalent negative stiffness, nonlinear stiffness, damping, and mass through X-shaped or rhomboid geometric nonlinear design, thereby achieving more robust vibration isolation in the low-frequency range.

[0003] The square cross-section structure of the hippocampus exoskeleton effectively buffers external impacts and compressions due to its unique linear-torsional deformation characteristics, protecting the spine from injury. When subjected to external forces, this structure dissipates energy through the torsion of muscles and the relative sliding motion of the bone plates, demonstrating exceptional energy absorption capabilities. Therefore, it is necessary to design a novel vibration isolation device with a square cross-section and magnetic negative stiffness coupling, inspired by the hippocampus exoskeleton structure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings in the above-mentioned background technology and provide a novel low-frequency vibration isolation device with a square cross-section and magnetic negative stiffness coupling, which is a simulated seahorse exoskeleton. This low-frequency vibration isolation device should have vibration isolation function, and can achieve a more robust vibration isolation effect in low-frequency vibration and have more efficient energy absorption characteristics.

[0005] The technical solution of this invention is:

[0006] A novel low-frequency vibration isolation device with a square cross-section and magnetic negative stiffness coupling, mimicking a seahorse exoskeleton, is characterized in that: the device includes a top plate and a bottom plate that are horizontally arranged and correspond to each other, a central rotating mechanism located in the middle of the device and between the top plate and the bottom plate, and vertical guide mechanisms located on the left and right sides of the central rotating mechanism and connected to the top plate and the bottom plate respectively.

[0007] The vertical guide mechanism includes a first guide rod vertically fixed to the left side of the base plate, a top plate that slides with the first guide rod through an installed first top plate bearing, a first spring that is positioned on the first guide rod through two first spring supports, and a first guide member that is positioned on the first guide rod through a first linear guide bearing and located at the top of the first spring. It also includes a second guide rod vertically fixed to the right side of the base plate, a top plate that slides with the second guide rod through an installed second top plate bearing, a second spring that is positioned on the second guide rod through two second spring supports, and a second guide member that is positioned on the second guide rod through a second linear guide bearing.

[0008] The central rotating mechanism includes a horizontally arranged rotating shaft connected at both ends to the first and second guide members, a first turntable and a second turntable rotatably positioned at both ends of the rotating shaft, a second rod hinged at both ends to the right edge of the first turntable facing the second turntable and the top plate, a third rod hinged at both ends to the left edge of the first turntable facing the second turntable and the bottom plate, a first rod hinged at both ends to the left edge of the second turntable facing the first turntable and the top plate, and a fourth rod hinged at both ends to the right edge of the second turntable facing the first turntable and the bottom plate; the first turntable is provided with a plurality of outer ring permanent magnets arranged in a ring, and the second turntable is provided with a plurality of inner ring permanent magnets arranged in a ring.

[0009] The first turntable has several mounting slots arranged in a ring on its inner end face and is equipped with permanent magnet covers for sealing the mounting slots. Each mounting slot contains one of the outer ring permanent magnets. The central part of the several mounting slots is coaxially provided with a disc-shaped axial mounting slot. One side end face of the second turntable is connected to a disc-shaped mounting platform through a hollow shaft sleeved on the rotating shaft. Several of the inner ring permanent magnets are arranged in a ring in the mounting platform. The mounting platform is inserted into the axial mounting slot, and the outer circumferential surface of the mounting platform corresponds to the inner circumferential surface of the axial mounting slot and maintains a movement gap.

[0010] The magnetic fields of two adjacent outer ring permanent magnets are in opposite directions and perpendicular to the axis of rotation, and the magnetic fields of two adjacent inner ring permanent magnets are in opposite directions and perpendicular to the axis of rotation.

[0011] The first, second, third, and fourth rods have equal lengths; the first and second turntables have equal radii; and the length of the first rod is greater than the radius of the first turntable.

[0012] The first member is parallel to the fourth member; the second member is parallel to the third member.

[0013] The two first spring supports include a first lower spring support fixed to the base plate and a first upper spring support sleeved on the first guide rod, with the first guide rod vertically inserted and fixed to the base plate through the first lower spring support; the two second spring supports include a second lower spring support fixed to the base plate and a second upper spring support sleeved on the second guide rod, with the second guide rod vertically inserted and fixed to the base plate through the second lower spring support.

[0014] The beneficial effects of this invention are:

[0015] 1. The simulated seahorse vibration isolation device consists of a top plate and a bottom plate that simulate the "L"-shaped exoskeleton of a seahorse, and a turntable in the middle that simulates the central spine. When the top plate is subjected to external excitation, linear vibration will be converted into torsional vibration. The rotating turntable will generate beneficial nonlinear mass and damping characteristics, thereby absorbing energy more efficiently and improving the low-frequency vibration isolation effect.

[0016] 2. When the top plate of the device is subjected to vibration excitation, the top plate and the bottom plate will produce relative linear motion. At the same time, the rod will drive the two turntables to rotate relative to each other, which will cause the outer ring permanent magnet embedded in the first turntable and the inner ring permanent magnet embedded in the second turntable to rotate relative to each other. This provides beneficial nonlinear negative stiffness and improves the overall vibration isolation performance.

[0017] 3. The structure of this device is flexible and adjustable. It can adapt to different load requirements by changing the number, gap, width and rod installation position of permanent magnets. At the same time, it can adapt to different loads and operating frequencies by adjusting the stiffness and length of the vertical spring.

[0018] 4. The vertical guide mechanism of the device is symmetrically distributed on both sides of the central rotating mechanism, and the whole device has good stability.

[0019] 5. The device has a simple structure and is easy to install. It also has complex and beneficial nonlinear characteristics and good low-frequency vibration isolation performance, making it suitable for widespread application. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the left-side structure according to an embodiment of the present invention.

[0023] Figure 4 This is one of the three-dimensional structural schematic diagrams of the central rotating mechanism in an embodiment of the present invention (right front side view).

[0024] Figure 5This is the second three-dimensional structural schematic diagram of the central rotating mechanism in an embodiment of the present invention (right rear side view).

[0025] Figure 6 This is a schematic diagram of the magnetic force direction of the outer ring permanent magnet in an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram of the magnetic force direction of the inner ring permanent magnet in an embodiment of the present invention.

[0027] Figure 8 This is an exploded view of the central rotating mechanism according to an embodiment of the present invention.

[0028] Figure label:

[0029] 1. Top plate; 2. Bottom plate; 3. Vertical guide mechanism; 3-1. First top plate bearing; 3-2. Second top plate bearing; 3-3. First guide rod; 3-4. Second guide rod; 3-5. First linear guide bearing; 3-6. Second linear guide bearing; 3-7. First guide component; 3-8. Second guide component; 3-9. Upper support for the first spring; 3-10. Upper support for the second spring; 3-11. First spring; 3-12. Second spring; 3-13. Lower support for the first spring; 3-14. Second spring 4. Unsprung support; 4. Central rotating mechanism; 4-1. Top rod support; 4-2. First rod; 4-3. Second rod; 4-4. First turntable; 4-5. Permanent magnet cover; 4-6. Second turntable; 4-7. Rotating shaft; 4-8. Third rod; 4-9. Fourth rod; 4-10. Bottom rod support; 4-11. First bearing; 4-12. Second bearing; 4-13. Mounting groove; 4-14. Axial mounting groove; 4-15. Mounting platform; 5. Outer ring permanent magnet; 6. Inner ring permanent magnet. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1 The novel low-frequency vibration isolation device with a square cross-section and magnetic negative stiffness coupling, resembling a seahorse exoskeleton, includes a top plate 1, a bottom plate 2, a vertical guide mechanism 3, and a central rotating mechanism 4. The top plate and the bottom plate are vertically aligned and horizontally arranged. The top plate has several screw holes and a through hole on each of its left and right sides, and two screw holes in its center. The bottom plate has several screw holes on its left and right sides, and two screw holes in its center.

[0032] like Figure 2 As shown, the central rotating mechanism is centrally located in the device arrangement and is positioned between the top and the bottom plate. The vertical guide mechanism is positioned on the left and right sides of the central rotating mechanism and its upper and lower ends are respectively connected to the top plate and the bottom plate.

[0033] The vertical guide mechanism includes a first top plate bearing 3-1, a first guide rod 3-3, a first linear guide bearing 3-5, a first guide component 3-7, a first spring upper support 3-9, a first spring 3-11, and a first spring lower support 3-13; a second top plate bearing 3-2, a second guide rod 3-4, a second linear guide bearing 3-6, a second guide component 3-8, a second spring upper support 3-10, a second spring 3-12, and a second spring lower support 3-14.

[0034] The first top plate bearing is fixed to the top plate with bolts, and the axis of the first top plate bearing coincides with the axis of the through hole on the left side of the top plate; the top of the first guide rod mates with the first top plate bearing and corresponds vertically to the through hole on the left side of the top plate; the first linear guide bearing, the first guide member, the first upper spring support, and the first spring are all vertically and slidably positioned in the first guide rod from top to bottom; and the side of the first guide member is provided with a light hole, the lower spring support is vertically fixed to the left side of the bottom plate, and the bottom end of the first guide rod is inserted and fixed to the lower spring support with bolts; the upper and lower ends of the first spring abut against the upper spring support and the lower spring support, respectively.

[0035] The second top plate bearing is bolted to the top plate, and its axis coincides with the axis of the through hole on the right side of the top plate. The top of the second guide rod mates with the second top plate bearing and corresponds vertically to the through hole on the right side of the top plate. The second linear guide bearing, the second guide member, the upper support of the second spring, and the second spring are all vertically positioned in the second guide rod from top to bottom. The second guide member has a clear hole on its side, and the lower support of the second spring is vertically fixed to the right side of the bottom plate. The bottom end of the second guide rod is inserted into and bolted to the lower support of the second spring. The upper and lower ends of the second spring respectively abut against the upper and lower supports of the second spring. The top plate can move up and down simultaneously on the first and second guide rods via the first and second top plate bearings.

[0036] like Figure 3 , Figure 4 , Figure 5 , Figure 8 As shown, the central rotating mechanism includes a top rod support 4-1, a first rod 4-2, a second rod 4-3, a first turntable 4-4, a permanent magnet cover 4-5, a second turntable 4-6, a rotating shaft 4-7, a third rod 4-8, a fourth rod 4-9, a bottom rod support 4-10, a first bearing 4-11, a second bearing 4-12; an outer ring permanent magnet 5, and an inner ring permanent magnet 6.

[0037] The top rod support is installed on the lower end face of the top plate and fixed to the top plate with bolts; the bottom rod support is installed on the upper end face of the bottom plate and fixed to the bottom plate with bolts; the top rod support and the bottom rod support are corresponding in the vertical direction.

[0038] See Figure 8 The rotating shaft is horizontally arranged, and its two ends are respectively inserted into the light holes of the first guide and the second guide and connected by bolts; both sides of the rotating shaft are provided with positioning shoulders, the first bearing is coaxially installed on the left shoulder of the rotating shaft, and the second bearing is coaxially installed on the right shoulder of the rotating shaft, and the rotating shaft outside the first bearing and the second bearing is provided with rotating grooves.

[0039] The first turntable is rotatably positioned on the left side of the rotating shaft via the first bearing; the inner end face of the first turntable is provided with a plurality of mounting slots 4-13 arranged in a ring (preferably 10 mounting slots), and a disc-shaped axial mounting slot 4-14 is provided coaxially in the middle of the mounting slots, and the center of the axial mounting slot is provided with a shaft hole that mates with the outer ring of the first bearing; an outer ring permanent magnet is installed in each mounting slot, and the end face of the first turntable is provided with a permanent magnet cover that mates with the opening of the mounting slot to prevent the outer ring permanent magnet from coming out.

[0040] like Figure 5 , Figure 8 As shown, the second turntable is rotatably positioned on the right side of the rotating shaft via a second bearing. The inner end face of the second turntable is connected to a disc-shaped mounting platform via a hollow shaft sleeved on the rotating shaft. The mounting platform is coaxially arranged with the second turntable, and the second bearing is fitted between the shaft hole of the second turntable and the rotating shaft. A plurality of (preferably 10) inner ring permanent magnets are arranged in a ring on the mounting platform. The outer diameter of the mounting platform is smaller than the axial mounting groove of the first turntable, and the mounting platform is inserted into the axial mounting groove and fixed, so that the outer circumferential surface of the mounting platform corresponds to the inner circumferential surface of the axial mounting groove, but a suitable gap is maintained to prevent motion interference.

[0041] To prevent the first and second turntables from detaching from the rotating shaft, spring retaining rings are inserted into the rotating slots at both ends of the rotating shaft to limit the first and second turntables.

[0042] like Figure 4As shown: the two ends of the second rod 4-3 are respectively hinged to the right edge of the end face of the top rod support and the first turntable (facing the second turntable); the two ends of the third rod 4-8 are respectively hinged to the left edge of the end face of the bottom rod support and the first turntable on the same side. Similarly: the first rod 4-2 is respectively hinged to the left edge of the end face of the top rod support and the second turntable (facing the first turntable); the fourth rod is respectively hinged to the right edge of the end face of the bottom rod support and the second turntable on the same side. The first, second, third, and fourth rods have equal lengths, and the length of the first rod is greater than the radius of the first turntable. The radii of the first and second turntables are equal. The first and fourth rods are parallel, and the second and third rods are parallel.

[0043] like Figure 6 , Figure 7 As shown, in the annular arrangement of inner ring permanent magnets, adjacent inner ring permanent magnets have opposite magnetic field directions: one is perpendicular to the axis of rotation and points inward (towards the inner diameter), and the other is perpendicular to the axis of rotation and points outward (towards the outer diameter). Correspondingly, in the annular arrangement of outer ring permanent magnets, adjacent outer ring permanent magnets have opposite magnetic field directions: one is perpendicular to the axis of rotation and points inward, and the other is perpendicular to the axis of rotation and points outward. When the first and second turntables rotate relative to each other, the outer and inner ring permanent magnets provide a nonlinear negative stiffness, and the first and second turntables provide nonlinear mass and nonlinear damping.

[0044] Working principle:

[0045] In applying this invention, the top plate is used to bear external excitation. When the external excitation causes vibration, the top plate vibrates up and down under the constraint of two guide rods. It also drives the first and second turntables to rotate relative to each other and move up and down through four rods. At the same time, it drives the rotating shaft to move up and down, which in turn causes the guide members and the bottom spring to deform. During the movement, nonlinear damping and nonlinear mass are generated to consume the energy generated by the vibration, so that the whole device has good low-frequency vibration isolation performance. The relative rotation of the two turntables drives the relative rotation and up and down vibration of the outer and inner permanent magnets, which generates nonlinear negative stiffness, which can effectively reduce the resonance frequency, widen the vibration isolation bandwidth, and improve the load-bearing capacity and vibration isolation performance of the structure. At the same time, by changing the width and gap of the magnets, the mass of the turntables, or the stiffness of the springs, the load-bearing range of the device can be changed and adapted to various vibration excitations.

Claims

1. A low-frequency vibration isolation device with a square cross-section and magnetic negative stiffness coupling, mimicking a seahorse exoskeleton, characterized in that: The device includes a top plate (1) and a bottom plate (2) arranged horizontally and corresponding vertically, a central rotating mechanism (4) located in the middle of the device and between the top plate and the bottom plate, and vertical guide mechanisms (3) located on the left and right sides of the central rotating mechanism and connected to the top plate and the bottom plate respectively. The vertical guide mechanism includes a first guide rod (3-3) vertically fixed to the left side of the base plate, a top plate that slides with the first guide rod via a first top plate bearing (3-1), a first spring (3-11) positioned on the first guide rod via two first spring supports, and a first guide member (3-7) positioned on the first guide rod via a first linear guide bearing (3-5) and located at the top of the first spring. It also includes a second guide rod (3-4) vertically fixed to the right side of the base plate, a top plate that slides with the second guide rod via a second top plate bearing (3-2), a second spring (3-12) positioned on the second guide rod via two second spring supports, and a second guide member (3-8) positioned on the second guide rod via a second linear guide bearing (3-6). The central rotating mechanism includes a horizontally arranged rotating shaft (4-7) connected at both ends to the first guide and the second guide; a first turntable (4-4) and a second turntable (4-6) rotatably positioned at both ends of the rotating shaft; a second rod (4-3) hinged at both ends to the right edge of the first turntable facing the second turntable and the top plate; a third rod (4-8) hinged at both ends to the left edge of the first turntable facing the second turntable and the bottom plate; a first rod (4-2) hinged at both ends to the left edge of the second turntable facing the first turntable and the top plate; and a fourth rod (4-9) hinged at both ends to the right edge of the second turntable facing the first turntable and the bottom plate. The first turntable is provided with a plurality of outer ring permanent magnets (5) arranged in a ring, and the second turntable is provided with a plurality of inner ring permanent magnets arranged in a ring. The first turntable has a plurality of mounting grooves (4-13) arranged in a ring on its inner end face and is equipped with a permanent magnet cover (4-5) for sealing the mounting groove. Each mounting groove contains one of the outer ring permanent magnets. The central part of the plurality of mounting grooves is provided with a disc-shaped axial mounting groove (4-14). One side end face of the second turntable is connected to a disc-shaped mounting platform (4-15) through a hollow shaft sleeved on the rotating shaft. The plurality of inner ring permanent magnets are arranged in a ring in the mounting platform. The mounting platform is inserted into the axial mounting groove, and the outer circumferential surface of the mounting platform corresponds to the inner circumferential surface of the axial mounting groove and maintains a movement gap. The magnetic fields of two adjacent outer ring permanent magnets are in opposite directions and perpendicular to the axis of rotation, and the magnetic fields of two adjacent inner ring permanent magnets are in opposite directions and perpendicular to the axis of rotation.

2. The low-frequency vibration isolation device with square cross-section and magnetic negative stiffness coupling, similar to a seahorse exoskeleton, as described in claim 1, is characterized in that: The first, second, third, and fourth rods have equal lengths; the first and second turntables have equal radii; and the length of the first rod is greater than the radius of the first turntable.

3. The low-frequency vibration isolation device with square cross-section and magnetic negative stiffness coupling of the simulated seahorse exoskeleton according to claim 2, characterized in that: The first member is parallel to the fourth member; the second member is parallel to the third member.

4. The low-frequency vibration isolation device with square cross-section and magnetic negative stiffness coupling of the simulated seahorse exoskeleton according to claim 3, characterized in that: The two first spring supports include a first lower spring support (3-13) fixed to the base plate and a first upper spring support (3-9) sleeved on the first guide rod. The first guide rod is vertically inserted and fixed to the base plate through the first lower spring support. The two second spring supports include a second lower spring support (3-14) fixed to the base plate and a second upper spring support (3-10) sleeved on the second guide rod. The second guide rod is vertically inserted and fixed to the base plate through the second lower spring support.

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