Variable stiffness and variable damping hydro-elastic inerter vibration isolation device

Abstract

The present application relates to a kind of variable stiffness variable damping hydrodynamic inertance vibration isolation device, including cylinder, piston being movably arranged in the inside of cylinder, annular end cover being arranged in the top port of cylinder, the central axis of the piston is vertically through annular end cover;The inner peripheral side wall of the annular end cover is fixedly provided with annular end cover magneto-rheological elastomer, the inner peripheral side wall of the end cover magneto-rheological elastomer is fixedly provided with end cover electrically conductive sleeve, the inner side of the end cover electrically conductive sleeve is provided with end cover magnetic block fixed in the central axis of piston, end cover excitation coil is arranged on the end cover magnetic block and annular end cover, and the rigidity and damping of end cover magneto-rheological elastomer are controlled by the magnetic field generated by the energization of end cover excitation coil.The present application is reasonable in design, can realize the dynamic adjustment of rigidity and damping, effectively solve the problem that traditional structure is not good in vibration isolation effect when facing different frequency vibrations, and improve the practicality and universality of vibration isolation technology.

Description

Technical Field

[0001] This invention belongs to the field of vibration isolation technology, and particularly relates to a hydraulic inertial capacitance vibration isolation device with variable stiffness and variable damping. Background Technology

[0002] In the field of vibration isolation technology, traditional vibration isolation devices typically employ a design with fixed stiffness and fixed damping. This design often fails to achieve ideal vibration isolation effects when faced with vibrations of different frequencies, especially when the anti-resonance frequency does not match the actual vibration frequency. In such cases, the vibration isolation effect drops significantly, and resonance may even occur, damaging the equipment. Furthermore, the relatively fixed structure of traditional vibration isolation devices lacks design flexibility and cannot be easily adjusted according to the needs of actual application scenarios, thus limiting further improvements in their vibration isolation performance. Summary of the Invention

[0003] The present invention addresses the problems existing in the prior art, namely, the technical problem to be solved by the present invention is to provide a hydraulic inertial capacitance vibration isolation device with variable stiffness and variable damping.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a hydraulic inertial-capacitive vibration isolation device with variable stiffness and variable damping, comprising a cylinder, a piston movably disposed inside the cylinder, and an annular end cap disposed at the top port of the cylinder, wherein the central axis of the piston passes through the annular end cap; an annular magnetorheological elastomer is fixedly disposed on the inner circumferential sidewall of the annular end cap, and an end cap conductive sleeve is fixedly disposed on the inner circumferential sidewall of the end cap magnetorheological elastomer; an end cap magnetic block is disposed inside the end cap conductive sleeve and fixed to the central axis of the piston; both the end cap magnetic block and the annular end cap are provided with end cap excitation coils, and the magnetic field generated by the end cap excitation coil controls the stiffness and damping of the end cap magnetorheological elastomer.

[0005] Furthermore, the inner cavity of the cylinder includes an upper part and a lower part, the diameter of the upper part being larger than the diameter of the lower part; the piston includes an upper piston and a lower piston spaced apart, the upper piston and the lower piston being located in the upper part and the lower part of the inner cavity of the cylinder, respectively, and the upper piston, the lower piston and the cylinder forming a fluid cavity for accommodating fluid; the central axis of the piston is located in the middle of the upper piston.

[0006] Furthermore, the bottom of the cylinder is fixedly connected to multiple circumferentially distributed magnetic bases, and annular base conductive sleeves are fixed between the inner ends of the multiple magnetic bases. Annular base magnetorheological elastomers are fixed to the inner circumferential sidewalls of the base conductive sleeves. A base magnetic block is provided on the inner side of the base magnetorheological elastomer and is fixedly connected to the bottom of the lower piston. A base excitation coil is provided on the base magnetic block. The magnetic field generated by the base excitation coil when energized controls the stiffness and damping of the base magnetorheological elastomer. The fluid cavity is filled with incompressible fluid.

[0007] Furthermore, several first mass blocks are arranged vertically stacked below the base magnetic block, and the several first mass blocks, the base magnetic block, and the lower piston are locked together by vertical connecting bolts.

[0008] Furthermore, the cylinder body is a stepped shaft with a large diameter at the top and a small diameter at the bottom, and an annular magnetic block is fixed on the stepped surface on the outer circumference of the cylinder body; a vertical magnetic column is fixed between the top of each magnetic base and the annular magnetic block, and a circumferential excitation coil is wound around the outer circumference of the vertical magnetic column.

[0009] Furthermore, both the end cap magnetic block and the base magnetic block are cross-shaped, and the four extended ends of the end cap magnetic block are wound with end cap excitation coils; the four extended ends of the base magnetic block are wound with base excitation coils; the inner circumference of the annular end cap has four pairs of notches evenly distributed, and the four pairs of notches correspond to the positions of the four extended ends of the end cap magnetic block, with an end cap excitation coil wound between each pair of notches.

[0010] Furthermore, it also includes a cylindrical first base disposed below multiple magnetic bases, each magnetic base being connected and fixed to the top of the first base by fasteners.

[0011] Furthermore, the fluid cavity is filled with magnetorheological fluid; the upper piston includes an upper part and a lower part of the upper piston that are parallel to each other and spaced apart, the diameter of the upper part of the upper piston is larger than the diameter of the lower part of the upper piston, and the upper part of the upper piston has an injection port and an outlet port; an upper excitation coil connected to an external DC power supply via a power line is provided on the outer periphery of the lower part of the upper piston, and an upper magnetic ring is fixed on the inner periphery of the upper part of the inner cavity; the lower piston includes an upper part and a lower part of the lower piston that are parallel to each other and spaced apart, the diameter of the upper part of the lower piston is smaller than the diameter of the lower part of the lower piston, a lower excitation coil connected to an external DC power supply via a power line is provided on the outer periphery of the upper part of the lower piston, and a lower magnetic ring is fixed on the inner periphery of the lower part of the inner cavity.

[0012] Furthermore, the bottom of the cylinder is closed, and a spring that can extend and contract vertically is connected between the bottom of the lower piston and the inner bottom of the cylinder.

[0013] Furthermore, several second mass blocks stacked vertically are fixed to the top of the upper part of the lower piston.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed and can realize dynamic adjustment of stiffness and damping, effectively solving the problem of poor vibration isolation effect of traditional structures when facing vibrations of different frequencies, and improving the practicality and versatility of vibration isolation technology. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front cross-sectional structure of Embodiment 1 of the present invention;

[0016] Figure 2 This is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention;

[0017] Figure 3 This is a top view schematic diagram of the annular end cap in Embodiment 1 and Embodiment 2 of the present invention;

[0018] Figure 4 This is a schematic diagram of the magnetic field circuit of the base magnetorheological elastic body in Embodiment 1 of the present invention;

[0019] Figure 5 This is a schematic diagram of the front cross-sectional structure of Embodiment 2 of the present invention;

[0020] Figure 6 This is a three-dimensional structural schematic diagram of Embodiment 2 of the present invention;

[0021] Figure 7 This is a three-dimensional structural diagram of the piston in Embodiment 2 of the present invention;

[0022] Figure 8 This is a schematic diagram of the magnetic field circuit of the magnetic guide frame and magnetic guide ring in Embodiment 2 of the present invention;

[0023] Figure 9 This is a schematic cross-sectional view of the external power supply of the upper excitation coil in Embodiment 2 of the present invention.

[0024] In the picture:

[0025] 1-First base; 2-First mass block; 3-Base excitation coil; 4-Sealing ring groove; 5-Cylinder body; 6-Annular end cap; 7-End cap excitation coil; 8-End cap magnetorheological elastomer; 9-End cap conductive sleeve; 10-End cap magnetic guide block; 11-Upper piston; 12-Annular magnetic guide block; 13-Lower piston; 14-Magnetic base; 15-Base magnetorheological elastomer; 16-Base conductive sleeve; 17-Second base; 18-DC interface; 19-Power cord; 20-Upper magnetic guide ring; 21-Upper magnetic guide frame; 22-Note 23-Liquid outlet; 24-Magnetorheological fluid; 25-Fluid cavity; 26-Upper excitation coil; 27-L-shaped channel; 28-Second mass block; 29-Lower excitation coil; 30-Lower magnetic ring; 31-Upper part of inner cavity; 32-Lower part of inner cavity; 33-Vertical magnetic column; 34-Circumferential excitation coil; 35-Upper part of upper piston; 36-Lower part of upper piston; 37-Central shaft; 38-Base magnetic block; 39-Notch; 40-Upper part of lower piston; 41-Lower part of lower piston; 42-Lower magnetic frame; 43-Spring. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0028] Example 1: As Figures 1-4As shown, the present invention discloses a hydraulic inertial capacitive vibration isolation device with variable stiffness and variable damping, comprising a cylinder 5, a piston movably disposed inside the cylinder 5, and an annular end cap 6 disposed at the top port of the cylinder 5. The piston slides axially with the inner cavity of the cylinder 5, and the central axis 37 of the piston passes upward through the inner hole of the annular end cap 6. An annular magnetorheological elastomer 8 is coaxially fixedly disposed on the inner peripheral side wall of the annular end cap 6. An annular conductive sleeve 9 is coaxially fixedly disposed on the inner peripheral side wall of the magnetorheological elastomer 8. An end cap magnetic block 10 is disposed on the inner side of the conductive sleeve 9 and fixed to the central axis 37 of the piston. The end cap magnetic block 10 moves up and down synchronously with the piston. Both the end cap magnetic block 10 and the annular end cap 6 are provided with end cap excitation coils 7. The magnetic field generated by the energized end cap excitation coils 7 controls the stiffness and damping of the end cap magnetorheological elastomer 8. During operation, the magnetic field generated by the energized end cap excitation coil passes through the end cap magnetic guide block, the annular end cap, the end cap conductive sleeve, and the end cap magnetorheological elastomer to form a magnetic field loop. When the end cap magnetic guide block and the piston move up and down synchronously, a shear valve-type working mode is formed by the end cap magnetorheological elastomer and the end cap magnetic guide block. The end cap magnetic guide block and the piston have a strong damping effect when passing through the end cap magnetorheological elastomer. The magnitude of the magnetic field can be controlled by adjusting the current intensity connected to the end cap excitation coil to change the arrangement structure of the magnetic particles in the end cap magnetorheological elastomer, thereby adjusting the stiffness and damping of the end cap magnetorheological elastomer.

[0029] In this embodiment, the cylinder body 5 is a stepped shaft with a large diameter at the top and a small diameter at the bottom. The inner cavity of the cylinder body 5 includes an upper inner cavity 31 and a lower inner cavity 32. The diameter of the upper inner cavity 31 is larger than the diameter of the lower inner cavity 32. The bottom of the cylinder body 5 is open.

[0030] In this embodiment, the piston includes an upper piston 11 and a lower piston 13, which are parallel to each other and spaced apart. The upper piston 11 and the lower piston 13 are located in the upper part 31 and the lower part 32 of the inner cavity of the cylinder 5, respectively. The upper piston 11, the lower piston 13, and the cylinder 5 together form a fluid cavity 25 for accommodating fluid. The central shaft 37 of the piston is located in the middle of the upper piston 11. The top of the central shaft 37 of the piston is used to connect with the object to be isolated from vibration. Furthermore, the outer peripheral surfaces of the upper piston 11 and the lower piston 13 are provided with sealing ring grooves 4. O-rings are provided in the sealing ring grooves 4. The O-rings on the outer peripheral side of the upper piston 11 contact the inner wall of the upper part 31 of the inner cavity to form a sealed connection, and the O-rings on the outer peripheral side of the lower piston 13 contact the inner wall of the lower part 32 of the inner cavity to form a sealed connection.

[0031] In this embodiment, a plurality of magnetic bases 14 are fixedly connected to the bottom of the cylinder body 5 in a circular arrangement around the axis of the cylinder body 5. The magnetic bases 14 are horizontally arranged, and a circular base conductive sleeve 16 is coaxially fixed between the inner ends of the plurality of magnetic bases 14. A ring-shaped base magnetorheological elastomer 15 is coaxially fixed to the inner circumferential side wall of the base conductive sleeve 16. A base magnetic guide block 38 is arranged on the inner side of the base magnetorheological elastomer 15 and fixedly connected to the bottom of the lower piston 13. The base magnetic guide block 38 is horizontally arranged, and a base excitation coil 3 is provided on the base magnetic guide block 38. The magnetic field generated by the base excitation coil 3 when energized controls the stiffness and damping of the base magnetorheological elastomer 15.

[0032] In this embodiment, a circular magnetic block 12 is fixed on the stepped surface on the outer circumference of the cylinder body 5; a vertical magnetic column 33 is provided between the top of each magnetic base 14 and the circular magnetic block 12. The magnetic base 14, the vertical magnetic column 33 and the circular magnetic block 12 are connected and fixed by bolts. A peripheral excitation coil 34 is wound around the outer circumference of the vertical magnetic column 33. During operation, the magnetic field generated by the energized peripheral excitation coil 34 and base excitation coil 3 passes through the base magnetic guide block 38, vertical magnetic guide column 33, magnetic base 14, base magnetorheological elastomer 15, and base conductive sleeve 16 to form a circuit. When the base magnetic guide block 38 and the lower piston 13 move up and down synchronously, the base magnetorheological elastomer 15 and the base magnetic guide block 38 form a shear valve working mode. The base magnetic guide block 38 and the lower piston 13 have a strong damping effect when passing through the base magnetorheological elastomer 15. The stiffness and damping of the base magnetorheological elastomer 15 can be adjusted by adjusting the current intensity connected to the peripheral excitation coil 34 and the base excitation coil 3, so that the magnetic field generated by the peripheral excitation coil 34 and the base excitation coil 3 is in the same direction. The magnitude of the magnetic field can be controlled to change the arrangement structure of the magnetic particles in the base magnetorheological elastomer 15, thereby adjusting the magnetic field magnitude and the magnetic field strength of the base magnetorheological elastomer 15.

[0033] In this embodiment, the fluid cavity 25 is filled with incompressible fluid. Force is transmitted between the upper and lower pistons through the incompressible fluid.

[0034] In this embodiment, several first mass blocks 2 stacked vertically are arranged below the base magnetic block 38. The several first mass blocks 2, the base magnetic block 38, and the lower piston 13 are locked together by vertical connecting bolts. It should be noted that different numbers of first mass blocks can be connected to the bottom of the base magnetic block (by continuously replacing the vertical connecting bolts of different lengths) to change the inertial mass and achieve adjustment of the anti-resonance frequency.

[0035] In this embodiment, both the end cap magnetic block 10 and the base magnetic block 38 are cross-shaped. The four extended ends of the end cap magnetic block 10 are each wound with an end cap excitation coil 7; the four extended ends of the base magnetic block 38 are each wound with a base excitation coil 3; the inner circumference of the annular end cap 6 is evenly distributed with four pairs of notches 39, each pair corresponding to one of the four extended ends of the end cap magnetic block 10, and an end cap excitation coil 7 is wound between each pair of notches 39. Furthermore, gaps are left between the lower piston 13 and the base magnetic block 38, and between the base magnetic block 38 and the first mass block 2, to provide space for the base excitation coil to wind and prevent it from being crushed.

[0036] In this embodiment, a cylindrical first base 1 is also provided below a plurality of magnetic bases 14. Each magnetic base 14 is connected and fixed to the top of the first base 1 by fasteners. The first base 1 is used for the installation of the entire device.

[0037] In this embodiment, both the end cap conductive sleeve 9 and the base conductive sleeve 16 are made of copper. The end cap magnetorheological elastomer 8 and the base magnetorheological elastomer 15 are both made of several arc-shaped strips of magnetorheological elastomer bonded together. Their strength is not as ideal as that of a whole elastomer, so a copper sleeve of a certain thickness is specially added to the outside of the magnetorheological elastomer to improve its shear performance.

[0038] In this embodiment, the magnetic particles of the end cap magnetorheological elastomer 8 and the base magnetorheological elastomer 15 can be iron powder or other alloy powders.

[0039] In this embodiment, the strength of the magnetic field is controlled by the strength of the current, thereby changing the mechanical properties of the magnetorheological elastomer, altering its stiffness and damping, and ultimately adjusting its anti-resonance frequency to achieve a better vibration isolation effect.

[0040] In this embodiment, by adjusting the current intensity connected to the end cap excitation coil 7, the magnetic field strength is controlled to change the arrangement of magnetic particles within the end cap magnetorheological elastomer 8, thereby adjusting the stiffness of the end cap magnetorheological elastomer 8. The base excitation coil 3 and the peripheral excitation coil 34 can also change the magnetic field strength by altering the external current intensity, thereby changing the arrangement of magnetic particles within the base magnetorheological elastomer 15, and thus changing its stiffness. This alters the stiffness and damping of the structure, achieving adjustment of the anti-resonance frequency.

[0041] Example 2: Figure 3 , 5As shown in Figure 9, the present invention discloses a hydraulic inertial-capacitive vibration isolation device with variable stiffness and variable damping, comprising a cylinder 5, a piston movably disposed inside the cylinder 5, and an annular end cap 6 disposed at the top port of the cylinder 5. The piston slides along the axial direction of the cylinder 5 with the inner cavity of the cylinder 5, and the central axis 37 of the piston passes upward through the inner hole of the annular end cap 6. An annular magnetorheological elastomer 8 is coaxially fixedly disposed on the inner circumferential side wall of the annular end cap 6, and an annular conductive sleeve 9 is coaxially fixedly disposed on the inner circumferential side wall of the magnetorheological elastomer 8. An end cap magnetic block 10 is disposed on the inner side of the conductive sleeve 9 and fixed to the central axis 37 of the piston. The end cap magnetic block 10 moves up and down synchronously with the piston. Both the end cap magnetic block 10 and the annular end cap 6 are provided with end cap excitation coils 7. The magnetic field generated by the energized end cap excitation coils 7 controls the stiffness and damping of the end cap magnetorheological elastomer 8. During operation, the magnetic field generated by the energized end cap excitation coil 7 passes through the end cap magnetic guide block 10, the annular end cap 6, the end cap conductive sleeve 9, and the end cap magnetorheological elastomer 8 to form a magnetic field circuit. When the end cap magnetic guide block 10 moves up and down synchronously with the piston, the end cap magnetorheological elastomer 8 and the end cap magnetic guide block 10 form a shear valve working mode. The end cap magnetic guide block 10 and the piston have a strong damping effect when passing through the end cap magnetorheological elastomer 8. The magnitude of the magnetic field can be controlled by adjusting the current intensity connected to the end cap excitation coil to change the arrangement structure of the magnetic particles in the end cap magnetorheological elastomer, thereby adjusting the stiffness and damping of the end cap magnetorheological elastomer.

[0042] In this embodiment, the cylinder body 5 is a stepped shaft with a large diameter at the upper end and a small diameter at the lower end. The inner cavity of the cylinder body 5 includes an upper inner cavity 31 and a lower inner cavity 32. The diameter of the upper inner cavity 31 is larger than the diameter of the lower inner cavity 32.

[0043] In this embodiment, the piston includes an upper piston 11 and a lower piston 13 that are parallel to each other and spaced apart. The upper piston 11 and the lower piston 13 are located in the upper part 31 and lower part 32 of the inner cavity of the cylinder 5, respectively. The upper piston 11, the lower piston 13, and the cylinder 5 together form a fluid cavity 25 for accommodating fluid. The central shaft 37 of the piston is located in the middle of the upper piston 11. The top of the central shaft 37 of the piston is used to connect to the object being isolated from vibration.

[0044] In this embodiment, the fluid cavity 25 is filled with magnetorheological fluid 24. The magnetorheological fluid 24 may contain additives to prevent the magnetic particles from settling, such as surfactants and dispersants, which can keep the magnetic particles suspended and prevent settling. Furthermore, the magnetic particles in the magnetorheological fluid 24 can be iron powder or other alloy powders, and the carrier liquid in the magnetorheological fluid can be a non-magnetic liquid such as oil or water, compatible with the magnetic particles.

[0045] In this embodiment, the upper piston 11 is in the shape of "士", which includes an upper piston upper part 35 and an upper piston lower part 36 that are parallel and spaced apart up and down. The diameter of the upper piston upper part 35 is larger than that of the upper piston lower part 36, and the upper piston upper part 35 is adapted to the upper part 31 of the inner cavity; the lower piston 13 is in the shape of "工", which includes a lower piston upper part 40 and a lower piston lower part 41 that are parallel and spaced apart up and down. The diameter of the lower piston upper part 40 is smaller than that of the lower piston lower part 41, and the lower piston lower part 41 is adapted to the lower part 32 of the inner cavity. Further, sealing ring grooves 4 are provided on the outer peripheral sides of the upper piston upper part 35 and the lower piston lower part 41, and O-ring seals are provided in the sealing ring grooves 4. The O-ring seal on the outer peripheral side of the upper piston upper part 35 contacts the inner side wall of the upper part 31 of the inner cavity to form a sealed connection, and the O-ring seal on the outer peripheral side of the lower piston lower part 35 contacts the inner side wall of the lower part 32 of the inner cavity to form a sealed connection.

[0046] In this embodiment, a liquid injection port 22 and a liquid discharge port 23 are provided on the upper piston upper part 35. Both the liquid injection port 22 and the liquid discharge port 23 are connected to the fluid cavity 25, and both the liquid injection port 22 and the liquid discharge port 23 are sealed with bolts with sealing rings. When in use, the magnetorheological fluid 24 can be injected from the liquid injection port 22, and the liquid discharge port 23 is used to discharge the gas in the closed chamber (i.e., the fluid cavity 25).

[0047] In this embodiment, an upper excitation coil 26 connected to an external DC power supply is provided on the outer peripheral side of the upper piston lower part 36. The upper excitation coil 26 is installed on the upper magnetic conduction frame 21 on the outer peripheral side of the upper piston lower part 36, and an upper magnetic conduction ring 20 is fixed on the inner peripheral side wall of the upper part 31 of the inner cavity; a lower excitation coil 29 connected to an external DC power supply is provided on the outer peripheral side of the lower piston upper part 40. The lower excitation coil 29 is installed on the lower magnetic conduction frame 42 on the outer peripheral side of the lower piston upper part 40, and a lower magnetic conduction ring 30 is fixed on the inner peripheral side wall of the lower part 32 of the inner cavity. During operation, by adjusting the intensity of the externally connected current of the upper excitation coil 26 and the lower excitation coil 29, the magnetic field generated by the excitation coil can be controlled, and the magnetic particles inside the magnetorheological fluid 24 are arranged in different structures under the action of the magnetic field, thereby changing the stiffness and damping of the magnetorheological fluid. Further, the distances between the upper excitation coil 26 and the upper magnetic conduction ring 20, and between the lower excitation coil 29 and the lower magnetic conduction ring 30 are both small, using the magnetorheological fluid shear valve working model; the magnetorheological fluid will have a strong damping effect when passing through the magnetic fields generated by the upper excitation coil and the upper magnetic conduction ring, and the lower excitation coil and the lower magnetic conduction ring.

[0048] In this embodiment, the interior of the upper piston 11 has an L-shaped channel 27. The L-shaped channel 27 extends to the top of the central axis 37 of the piston, and the power line 19 connected to the upper excitation coil 26 of the upper piston lower part 35 extends out from the L-shaped channel 27.

[0049] In this embodiment, the bottom of the cylinder 5 is closed, and a spring 43 that can extend and contract vertically is connected between the bottom of the lower piston 41 and the inner bottom of the cylinder 5. In use, the stiffness can be adjusted by replacing the spring, thereby changing the stiffness and damping of the structure.

[0050] In this embodiment, a plurality of second mass blocks 28 stacked vertically are fixed to the top of the upper part 41 of the lower piston, and the plurality of second mass blocks 28 are connected to the upper part 41 of the lower piston by bolts. By adjusting the number of second mass blocks, the anti-resonance frequency can be adjusted.

[0051] In this embodiment, a cylindrical second base 17 located below the cylinder 5 is also included. The second base 17 is used for the installation of the entire device. The top of the second base 17 contacts the stepped surface of the outer circumference of the cylinder 5 and is connected together by bolts. The lower end of the cylinder extends into the inner cavity of the second base.

[0052] In this second embodiment, the magnetic field generated by the excitation coils can be controlled by adjusting the external current intensity of the upper excitation coil 26 of the upper piston 11 and the lower excitation coil 29 of the lower piston 13. The magnetic particles inside the magnetorheological fluid 24 arrange themselves into different structures under the influence of the magnetic field, thereby changing the stiffness and damping of the magnetorheological fluid. The distance between the upper excitation coil 26 and the upper magnetic ring 20 is relatively small, as is the distance between the lower excitation coil 29 and the lower magnetic ring 30. Using the shear valve-type working model of the magnetorheological fluid 24, there will be a strong damping effect when passing through. Furthermore, the stiffness can be adjusted by replacing the spring 43 below the lower piston 13. The anti-resonance frequency can be adjusted by changing the stiffness and damping of the structure, or by adjusting the number of the second mass blocks 28 above the lower piston 30.

[0053] It should be noted that the scheme adopted in Embodiment 1 consists of a cylinder body, an end cap (with an end cap magnetorheological elastomer, an end cap magnetic guide block, an end cap conductive sleeve, and an end cap excitation coil), an upper piston, a lower piston, a base magnetic guide block, a base magnetorheological elastomer, a base excitation coil, a base conductive sleeve, a magnetic base, an annular magnetic guide block, a vertical magnetic guide column, a peripheral excitation coil, and a first mass block, etc. That is, Embodiment 1 adjusts the stiffness and damping of the end cap magnetorheological elastomer and the base magnetorheological elastomer. The scheme adopted in Embodiment 2 consists of a cylinder body, an end cap, an upper piston, a lower piston, a magnetorheological fluid, an upper excitation coil, a lower excitation coil, an upper magnetic guide ring, a lower magnetic guide ring, and a second mass block, etc. That is, Embodiment 2 adjusts the stiffness and damping of the magnetorheological fluid in the cylinder body. The end cap structure (with an end cap magnetorheological elastomer, an end cap magnetic guide block, an end cap conductive sleeve, and an end cap excitation coil) used in Embodiment 2 is exactly the same as that used in Embodiment 1.

[0054] The advantages of this invention are:

[0055] (1) By adjusting the current, the excitation coil generates a magnetic field, which controls the arrangement of magnetic particles inside the magnetorheological elastomer or magnetorheological fluid. This change in arrangement can alter the stiffness and damping of the magnetorheological elastomer or magnetorheological fluid, enabling the vibration isolation device to track and match the changing vibration frequency in real time, thereby achieving a better vibration isolation effect. This significantly improves the system's adaptability to broadband multi-line spectrum vibrations and enables convenient control of the anti-resonance frequency.

[0056] (2) Combining hydraulic inertial capacitive design, while ensuring excellent low-frequency vibration isolation performance, it effectively solves the problem of excessively large mass block in traditional passive control, and realizes the miniaturization and lightweighting of the device;

[0057] (3) The non-contact magnetic control mechanism is adopted, which fundamentally eliminates the problem of friction and wear in mechanical transmission, greatly improves the reliability and service life of the device, and reduces maintenance requirements.

[0058] (4) It combines the reliability of passive control with the adaptability of semi-active control. By leveraging the rapid response characteristics of magnetorheological elastomers or magnetorheological fluids, it achieves efficient suppression of low-frequency vibrations, reducing system energy consumption while ensuring control accuracy.

[0059] (5) By increasing or decreasing the number of mass blocks to change the inertial mass, the flexibility and adaptability of its vibration isolation performance are further enhanced.

[0060] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0061] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0062] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A hydraulic inertial capacitance vibration isolation device with variable stiffness and variable damping, characterized in that: The device includes a cylinder body, a piston movably disposed inside the cylinder body, and an annular end cap disposed at the top port of the cylinder body. The central axis of the piston passes through the annular end cap. A ring-shaped magnetorheological elastomer is fixedly disposed on the inner circumferential side wall of the annular end cap. An end cap conductive sleeve is fixedly disposed on the inner circumferential side wall of the end cap magnetorheological elastomer. An end cap magnetic block is disposed inside the end cap conductive sleeve and fixed to the central axis of the piston. Both the end cap magnetic block and the annular end cap are provided with end cap excitation coils. The magnetic field generated by the end cap excitation coil when energized controls the stiffness and damping of the end cap magnetorheological elastomer. The cylinder body has an inner cavity including an upper part and a lower part, the diameter of the upper part being larger than the diameter of the lower part; the piston includes an upper piston and a lower piston spaced apart, the upper piston and the lower piston being located in the upper part and lower part of the inner cavity of the cylinder body respectively, and the upper piston, the lower piston and the cylinder body together form a fluid cavity for accommodating fluid; the central axis of the piston is located in the middle of the upper piston; The fluid cavity is filled with magnetorheological fluid; the upper piston includes an upper part and a lower part of the upper piston that are parallel to each other and spaced apart, the diameter of the upper part of the upper piston is larger than the diameter of the lower part of the upper piston, and the upper part of the upper piston has an injection port and an outlet port; an upper excitation coil connected to an external DC power supply via a power line is provided on the outer periphery of the lower part of the upper piston, and an upper magnetic ring is fixed on the inner periphery of the upper part of the inner cavity; the lower piston includes an upper part and a lower part of the lower piston that are parallel to each other and spaced apart, the diameter of the upper part of the lower piston is smaller than the diameter of the lower part of the lower piston, a lower excitation coil connected to an external DC power supply via a power line is provided on the outer periphery of the upper part of the lower piston, and a lower magnetic ring is fixed on the inner periphery of the lower part of the inner cavity; The bottom of the cylinder is closed, and a spring that can extend and contract vertically connects the bottom of the lower piston to the inner bottom of the cylinder.

2. The variable stiffness and variable damping hydraulic inertial capacitance vibration isolation device according to claim 1, characterized in that: Several second mass blocks stacked vertically are fixed to the top of the upper part of the lower piston.

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