Frequency sensitive magneto-rheological damper

Abstract

The application discloses a frequency-sensitive magneto-rheological damper, which comprises a cylinder body, a piston connecting rod and a piston body, the piston body is arranged in the cylinder body, the piston body comprises fixed permanent magnets, a movable magnetic assembly and a magnetic circuit assembly, the magnetic circuit assembly is arranged in the piston body and forms a working flow channel and a sliding chamber, the movable magnetic assembly is arranged in the sliding chamber, a damping channel is arranged between the piston body and the cylinder body, the fixed permanent magnets are arranged in the piston body and are located on the two sides of the movable magnetic assembly, the movable magnetic assembly comprises a movable magnetic block, a left pre-pressing piece is arranged on the left side of the movable magnetic assembly, and a right pre-pressing piece is arranged on the right side of the movable magnetic assembly, the left pre-pressing piece and the right pre-pressing piece are used for providing positive stiffness to the movable magnetic assembly, the fixed permanent magnets and the movable magnetic block are used for providing negative stiffness to the movable magnetic assembly, a magnetic circuit closed loop can be formed between the movable magnetic assembly, the magnetic circuit assembly and the piston body, the magneto-rheological fluid in the working flow channel is subjected to magnetic induction intensity, and thus the damping force output is changed.

Description

Technical Field

[0001] This invention relates to the technical field of equipment vibration suppression, and in particular to a frequency-sensitive magnetorheological damper. Background Technology

[0002] Vibration and shock generated by moving parts during operation can severely impact the normal operation of equipment, posing a significant challenge to its stability. Magnetorheological dampers are semi-active intelligent devices that use magnetorheological materials as the basic working medium and generate continuously controllable damping through the magnetorheological effect. Traditional magnetorheological dampers change the output damping force by altering the excitation coil current. This requires an external current source, and the variable damping magnitude is related to the coil current magnitude rather than the input excitation frequency. For equipment vibrating at different resonant frequencies, complex control algorithms are often required for vibration reduction. These issues limit the widespread application of magnetorheological technology.

[0003] To address the problems of traditional magnetorheological dampers, such as the need for external power supply, output damping force being independent of frequency, and the need for additional control algorithms, this patent proposes a frequency-sensitive magnetorheological damper with high static stiffness and low dynamic stiffness, based on the magnetorheological effect and resonance principle. The output damping force of this magnetorheological damper is related to the input excitation frequency, exhibiting characteristics of high static stiffness and low dynamic stiffness. It can achieve frequency sensitivity at a lower resonance frequency, has a compact structure, and is conducive to the further promotion and application of magnetorheological technology. Summary of the Invention

[0004] In view of this, the present invention provides a frequency-sensitive magnetorheological damper, wherein the output damping force of the magnetorheological damper is related to the input excitation frequency, and has the characteristics of high static stiffness and low dynamic stiffness, and can achieve frequency sensitivity at a low resonant frequency.

[0005] The present invention provides a frequency-sensitive magnetorheological damper using the following technical solution:

[0006] A frequency-sensitive magnetorheological damper includes a cylinder, a piston rod, and a piston body disposed on the piston rod. The piston body is slidably fitted within the cylinder. The piston body includes a fixed permanent magnet, a movable magnetic assembly, and a magnetic circuit assembly. The magnetic circuit assembly is disposed within the piston body and radially divides the piston body to form a working flow channel and a sliding chamber. The movable magnetic assembly is slidably fitted within the sliding chamber. A damping channel for the flow of magnetorheological fluid is provided between the piston body and the cylinder. The working flow channel communicates with the damping channel. Permanent magnets are spaced apart along the axial direction of the piston connecting rod within the piston body and located on both sides of the movable magnetic assembly. The movable magnetic assembly includes a movable magnetic guide block. A left preload member is provided on the left side of the movable magnetic assembly, and a right preload member is provided on the right side. The left and right preload members are used to provide positive stiffness to the movable magnetic assembly. The fixed permanent magnets and the movable magnetic guide block are used to provide negative stiffness to the movable magnetic assembly. The movable magnetic assembly, the magnetic circuit assembly, and the piston body can form a closed magnetic circuit, so that the magnetorheological fluid located in the working flow channel is subjected to magnetic induction intensity, thereby changing the damping force output.

[0007] Optionally, the movable magnetic assembly includes a movable permanent magnet and movable magnetic blocks located on both sides of the movable permanent magnet. The left preload component is a left preload spring, and the right preload component is a right preload spring. The movable permanent magnet and the movable magnetic blocks are coaxially fixedly mounted on the piston connecting rod. The movable permanent magnet is used to provide a magnetic circuit. The movable magnetic blocks are connected to the movable permanent magnet through a connector. A limiting part one is provided on the side of the fixed permanent magnet near the movable magnetic blocks, and a limiting part two is provided on the side of the movable magnetic blocks near the fixed permanent magnet. The left preload spring and the right preload spring are located on the left and right sides of the movable magnetic assembly through the limiting parts one and two at corresponding positions.

[0008] Optionally, the piston body further includes a piston sleeve, a fixing plate, and two piston end caps. The two piston end caps are respectively disposed on both sides of the piston sleeve. Two magnetic circuit assemblies are distributed radially along the piston sleeve, and the magnetic circuit assemblies are disposed axially between the two piston end caps. The fixed permanent magnet is disposed on the piston end cap, and the fixing plate is disposed on the outside of the piston end cap. The fixing plate, piston end caps, and piston sleeve form a closed shell.

[0009] Optionally, the cylinder body includes a cylinder barrel and a cylinder end cap disposed on the side wall of the cylinder barrel. The piston connecting rod is slidably disposed in the cylinder barrel through the cylinder end cap. A sealing seat is disposed between the inner side of the cylinder end cap and the inner wall of the cylinder barrel. A sealing element is disposed on the contact surface of the sealing seat with the cylinder barrel and the piston connecting rod. A guide element is disposed between the sealing seat and the piston connecting rod.

[0010] Optionally, the piston connecting rod has a receiving portion for accommodating the piston body, and a fixing nut is provided on the piston connecting rod. The piston body is disposed in the receiving portion and is limited by the receiving portion and the fixing nut.

[0011] Optionally, the piston end cap has a waist-shaped flow channel hole on its end face, and the flow channel hole communicates with the working flow channel.

[0012] Optionally, a floating piston is slidably fitted inside the cylinder on the side away from the piston rod, and a second seal is provided between the floating piston and the cylinder.

[0013] Optionally, the magnetic circuit assembly includes a magnetically conductive sleeve and a non-magnetically conductive sleeve, which are alternately arranged along the axial direction of the piston connecting rod.

[0014] Optionally, the connection end face of the fixing plate and the magnetic circuit assembly is provided with a sealing element.

[0015] Optionally, a first lifting ring is provided on the piston connecting rod, and a second lifting ring is provided on the side of the cylinder away from the piston connecting rod.

[0016] In summary, the present invention has at least one of the following beneficial technical effects:

[0017] 1. The output damping force is frequency sensitive. The difference between the input excitation frequency of the piston connecting rod and the natural frequency of the piston body enables the switching between closed magnetic circuit and open magnetic circuit working states. When the input excitation frequency is equal to the set natural frequency of the piston body, the magnetorheological damper outputs a large damping force; when the input excitation frequency is less than or greater than the set natural frequency of the piston body, the output damping force of the magnetorheological damper decreases.

[0018] 2. It has a low resonant frequency. Generally, springs have high stiffness and high static stiffness. When the mass unit is small, it cannot meet the requirement of low frequency resonance. By adopting the technical solution of the present invention, the movable magnetic component can simultaneously have high static stiffness and low dynamic stiffness, and has a low resonant frequency. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the magnetic circuit assembly according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the movable magnetic component according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the closed magnetic circuit working state according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the open magnetic circuit working state according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 1. Lifting ring one; 2. Sealing seat; 3. Cylinder barrel; 4. Fixing plate; 5. Fixed permanent magnet; 6. Piston end cap; 7. Magnetic circuit assembly; 701. Conductive magnetic sleeve; 702. Non-conductive magnetic sleeve; 8. Working flow channel; 9. Piston sleeve; 10. Lifting ring two; 11. Floating piston; 12. Fixing nut; 13. Right preload spring; 14. Movable magnetic block; 15. Movable permanent magnet; 16. Left preload spring; 17. Left end cap; 18. Piston connecting rod; 19. Guide component. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-5 The present invention will be described in further detail below.

[0026] This invention discloses a frequency-sensitive magnetorheological damper.

[0027] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 A frequency-sensitive magnetorheological damper includes a cylinder, a piston rod 18, and a piston body disposed on the piston rod 18. The piston body is slidably disposed within the cylinder. The piston body includes a fixed permanent magnet 5, a movable magnetic assembly, and a magnetic circuit assembly 7. The magnetic circuit assembly 7 is disposed within the piston body and radially divides the piston body to form a working flow channel 8 and a sliding chamber. The movable magnetic assembly is slidably disposed within the sliding chamber. A damping channel for the flow of magnetorheological fluid is provided between the piston body and the cylinder. The working flow channel 8 communicates with the damping channel. The fixed permanent magnet... The bodies 5 are distributed axially along the piston connecting rod 18 within the piston body and located on both sides of the movable magnetic assembly. The movable magnetic assembly includes a movable magnetic guide block 14. A left preload member is provided on the left side of the movable magnetic assembly, and a right preload member is provided on the right side. The left and right preload members are used to provide positive stiffness to the movable magnetic assembly. The fixed permanent magnet 5 and the movable magnetic guide block 14 are used to provide negative stiffness to the movable magnetic assembly. The movable magnetic assembly, the magnetic circuit assembly 7, and the piston body can form a magnetic circuit closed loop, so that the magnetorheological fluid in the working flow channel 8 is subjected to magnetic induction intensity, thereby changing the damping force output.

[0028] In this embodiment, two fixed permanent magnets 5 are arranged on the left and right sides of the piston body, and a movable magnetic guide block 14 is arranged in the movable magnetic assembly cavity and can reciprocate. The fixed permanent magnets 5 and the movable magnetic guide block 14 are arranged in an alternating N-S polarity attraction pattern to provide negative stiffness for the movable magnetic assembly. The left preload and right preload components provide positive stiffness for the movable magnetic assembly, so that the movable magnetic assembly has a low natural frequency, which satisfies the requirement that the damper can achieve a large damping force output at a low input excitation frequency. The present invention has the characteristics of compact structure, convenient disassembly and assembly, and low energy consumption.

[0029] In this embodiment, the output damping force of the present invention is frequency sensitive. The difference between the input excitation frequency of the piston connecting rod 18 and the natural frequency of the piston body realizes the switching between the closed magnetic circuit working state and the open magnetic circuit working state. When the input excitation frequency is equal to the set natural frequency of the piston body, the magnetorheological damper outputs a large damping force; when the input excitation frequency is less than or greater than the set natural frequency of the piston body, the output damping force of the magnetorheological damper decreases.

[0030] This invention has a low resonant frequency. Due to the large spring stiffness, it has high static stiffness. When the mass unit is small, it cannot meet the requirement of low frequency resonance. By adopting the technical solution of this invention, the movable magnetic component can simultaneously have high static stiffness and low dynamic stiffness, and thus has a low resonant frequency.

[0031] In this embodiment, the cylinder body includes a cylinder barrel 3 and a cylinder end cap disposed on the side wall of the cylinder barrel 3. The cylinder end cap is threadedly connected to the cylinder barrel 3. The cylinder barrel 3 has a hollow cavity. The cylinder end cap has a through hole communicating with the hollow cavity. The piston connecting rod 18 is slidably disposed in the cylinder barrel 3 through the through hole of the cylinder end cap. A sealing seat 2 is disposed between the inner side of the cylinder end cap and the inner wall of the cylinder barrel 3. The sealing seat 2 has a communicating hole communicating with the through hole. The outer contour of the sealing seat 2 is tightly fitted with the inner wall of the cylinder barrel 3. A sealing element is disposed on the contact surface of the sealing seat 2 with the cylinder barrel 3 and the piston connecting rod 18. A sealing groove is disposed on the sealing seat 2, and the sealing element is installed on the sealing groove. In this embodiment, the sealing element is a sealing ring. Two sealing elements are axially spaced at the contact surface between the sealing seat 2 and the inner wall of the cylinder barrel 3, and two sealing elements are axially spaced at the contact surface between the sealing seat 2 and the piston connecting rod 18. The sealing ring can effectively prevent the leakage of magnetorheological fluid and improve the sealing performance. In this embodiment, a groove is provided on the inner wall of the cylinder 3, and a boss is provided on the sealing seat 2. The sealing seat 2 is positioned by the boss and the groove, and is pressed and fixed by the cylinder end cover.

[0032] A guide member 19 is provided between the two seals located between the sealing seat 2 and the piston connecting rod 18. In this embodiment, the guide member 19 is a guide copper sleeve, which can reduce wear during the axial reciprocating sliding of the piston connecting rod 18 and also serve as a guide.

[0033] A first lifting ring 1 is provided on the piston connecting rod 18, and a second lifting ring 10 is provided on the side of the cylinder 3 away from the piston connecting rod 18. The first lifting ring 1 and the second lifting ring 10 are located on opposite sides of the cylinder along the axial direction. In this embodiment, the piston connecting rod 18 is located on the left side of the cylinder 3, the first lifting ring 1 is connected to the piston connecting rod 18 by a threaded connection, and the second lifting ring 10 is connected to the right side of the cylinder 3 by welding.

[0034] In this embodiment, the end of the piston connecting rod 18 away from the lifting ring 1 is recessed to form a receiving part for accommodating the piston body. A fixing nut 12 is provided on the piston connecting rod 18. The piston body is axially limited by the groove of the receiving part and the fixing nut 12, thus completing the limitation of the piston body. The structure is compact and facilitates the disassembly and assembly of the piston body.

[0035] In this embodiment, the piston body includes a fixed permanent magnet 5, a movable magnetic assembly, a magnetic circuit assembly 7, a piston sleeve 9, a fixing plate 4, and two piston end caps 6. The piston sleeve 9 has an internal receiving chamber. The two piston end caps 6 are respectively disposed on both sides of the piston sleeve 9 along the axial direction. The piston end cap 6 has a mounting hole radially opened along its axis. The fixed permanent magnet 5 is installed in the mounting hole of the piston end cap 6. There are two magnetic circuit assemblies 7 distributed radially along the piston sleeve 9, and the magnetic circuit assemblies 7 are disposed between the two piston end caps 6 along the axial direction of the piston sleeve 9. The fixing plate 4 is disposed on the outside of the piston end cap 6. A closed shell is formed between the piston sleeve 9, the two fixing plates 4, and the two piston end caps 6.

[0036] Piston sleeve 9, piston connecting rod 18, piston sleeve 9, fixing plate 4, fixed permanent magnet 5, movable permanent magnet 15, movable magnetic block 14, left preload component, right preload component and fixing nut 12 are coaxial.

[0037] In this embodiment, a floating piston 11 is slidably fitted on the side of the cylinder body away from the piston rod 18. The sliding piston divides the right side of the cylinder 3 into a damping channel and a gas channel. The gas channel is filled with a chemically stable gas, such as a rare gas, to ensure that the damper cylinder can work normally and improve the overall damping effect of the damper.

[0038] In this embodiment, the movable magnetic assembly includes a movable permanent magnet 15 and movable magnetically conductive blocks 14 located on both sides of the movable permanent magnet 15. The movable permanent magnet 15 and the movable magnetically conductive blocks 14 are coaxially fixedly mounted on the piston connecting rod 18. The movable permanent magnet 15 provides a magnetic circuit, and the movable magnetically conductive blocks 14 are connected to the movable permanent magnet 15 through a connector. A limiting part one is provided on the side of the fixed permanent magnet 5 near the movable magnetically conductive blocks 14, and a limiting part two is provided on the side of the movable magnetically conductive blocks 14 near the fixed permanent magnet 5. A left preload member is provided on the left side of the movable magnetic assembly for applying a preload force to the right, and a right preload member is provided on the right side for applying a preload force to the left. In this embodiment, the left preload member is a left preload spring 16, and the right preload member is a right preload spring 13. The left preload spring 16 and the right preload spring 13 are provided on both sides of the movable magnetic assembly to provide elastic force for reciprocating motion of the movable magnetic assembly.

[0039] In this embodiment, the first connecting component is a screw, and the movable magnetic block 14 and the movable permanent magnet 15 are connected by screws to form a movable magnetic assembly.

[0040] In this embodiment, the first limiting part is a boss, the second limiting part is a groove, the left preload spring 16 is limited and set on the fixed permanent magnet 5 and the movable magnetic block 14 located on the left side by the boss and the groove, and the right preload spring 13 is limited and set on the fixed permanent magnet 5 and the movable magnetic block 14 located on the left side by the boss and the groove.

[0041] In this embodiment, the end face of the piston end cap 6 is provided with a waist-shaped flow channel hole, which flows through the working flow channel 8 to reduce the throttling effect of fluid entering and exiting the piston.

[0042] In this embodiment, the magnetic circuit assembly 7 includes a magnetically conductive sleeve 701 and a non-magnetically conductive sleeve 702. The magnetically conductive sleeve 701 is made of a magnetically conductive material such as electrical pure iron or low-carbon steel; the non-magnetically conductive sleeve 702 is made of stainless steel. The magnetically conductive sleeve 701 and the non-magnetically conductive sleeve 702 are alternately arranged along the axial direction of the piston connecting rod 18. In this embodiment, from left to right, the magnetically conductive sleeve, the non-magnetically conductive sleeve 702, the magnetically conductive sleeve, the non-magnetically conductive sleeve 702, and the magnetically conductive sleeve are arranged in sequence. The two are alternately arranged and connected by welding to form the magnetic circuit assembly 7. When the vibration amplitude of the movable magnetic assembly changes, the switching between the closed magnetic circuit working state and the open magnetic circuit working state can be realized.

[0043] In this embodiment, a sealing element three is provided on the connection end face of the fixing plate 4 and the magnetic circuit assembly 7. In this embodiment, the sealing element three is a sealing ring to prevent the magnetorheological fluid from entering and improve the sealing effect. Specifically, sealing grooves are provided on the fixing plate 4 and the magnetic circuit assembly 7, and the sealing ring is installed to prevent the magnetorheological fluid from contacting the magnetic circuit assembly 7.

[0044] In this embodiment, a second seal is provided between the floating piston 11 and the cylinder 3, and the second seal is a sealing ring. A sealing ring is provided on the contact surface between the fixed plate 4 and the piston connecting rod 18, and a sealing ring is provided between the magnetic circuit assembly 7 and the piston end cap 6 to improve the sealing effect.

[0045] In this embodiment, when the frequency of the input excitation of the piston connecting rod 18 is equal to the natural frequency of the piston body, the vibration amplitude of the movable magnetic component is large, and the magnetorheological damper outputs a large damping force when the magnetic circuit is closed; when the frequency of the input excitation is much less than or much greater than the natural frequency of the piston body, the vibration amplitude of the movable magnetic component is small, and the magnetorheological damper outputs a small damping force when the magnetic circuit is open, thus achieving frequency sensitivity of the output damping force.

[0046] In this embodiment, the input excitation amplitudes of the piston connecting rod 18 are the same but the frequencies are different. When the frequency of the input excitation is equal to the natural frequency of the piston body, the movable magnetic component is in a resonant state with a large vibration amplitude. At this time, the damper is in a closed magnetic circuit working state and outputs a large damping force. When the frequency of the input excitation is much less than or much greater than the natural frequency of the piston body, the movable magnetic component is in a non-resonant state with a small vibration amplitude. At this time, the damper is in an open magnetic circuit working state and outputs a small damping force.

[0047] Reference Figure 4 When the magnetic circuit is in operation, the vibration amplitude of the movable magnetic component is large. The magnetic circuit closed loop is formed by the movable magnetic component, the conductive magnetic sleeve 701 in the magnetic circuit component 7 and the piston sleeve 9. This causes the magnetorheological fluid in the working flow channel 8 to be subjected to magnetic induction intensity perpendicular to the flow velocity direction. Based on the magnetorheological effect, motion damping is generated. Due to the effect of the closed-loop magnetic circuit, the damper generates a large damping force.

[0048] Reference Figure 5 When the magnetic circuit is open, the vibration amplitude of the movable magnetic component is small. The movable magnetic component and the non-magnetic sleeve 702 and piston sleeve 9 in the magnetic circuit component 7 cannot form a closed loop of the magnetic circuit. As a result, no magnetic induction intensity perpendicular to the direction of the magnetorheological fluid flow velocity can be generated at the gap of the working flow channel 8, and the damper generates a small damping force.

[0049] The magnetorheological damper of this invention has an output damping force that is related to the input excitation frequency, and features high static stiffness and low dynamic stiffness. It can achieve frequency sensitivity at a low resonant frequency, effectively eliminating the need for complex control algorithms for vibration reduction. Its compact structure is conducive to the further promotion and application of magnetorheological technology.

[0050] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A frequency-sensitive magnetorheological damper, characterized in that: The system includes a cylinder, a piston connecting rod, and a piston body disposed on the piston connecting rod. The piston body is slidably fitted within the cylinder. The piston body includes a fixed permanent magnet, a movable magnetic assembly, and a magnetic circuit assembly. The magnetic circuit assembly is disposed within the piston body and radially divides the piston body to form a working flow channel and a sliding chamber. The movable magnetic assembly is slidably fitted within the sliding chamber. A damping channel for the flow of magnetorheological fluid is provided between the piston body and the cylinder. The working flow channel communicates with the damping channel. The fixed permanent magnet is located along the piston connecting rod. The axially spaced components are distributed within the piston body and located on both sides of the movable magnetic assembly. The movable magnetic assembly includes a movable magnetic guide block. A left preload component is provided on the left side of the movable magnetic assembly, and a right preload component is provided on the right side. The left and right preload components are used to provide positive stiffness to the movable magnetic assembly. The fixed permanent magnet and the movable magnetic guide block are used to provide negative stiffness to the movable magnetic assembly. The movable magnetic assembly, the magnetic circuit assembly, and the piston body form a closed magnetic circuit, so that the magnetorheological fluid located in the working flow channel is subjected to magnetic induction intensity, thereby changing the damping force output.

2. The frequency-sensitive magnetorheological damper according to claim 1, characterized in that: The movable magnetic assembly includes a movable permanent magnet and movable magnetic guide blocks located on both sides of the movable permanent magnet. The left preload component is a left preload spring, and the right preload component is a right preload spring. The movable permanent magnet and the movable magnetic guide blocks are coaxially fixedly mounted on the piston connecting rod. The movable permanent magnet is used to provide a magnetic circuit. The movable magnetic guide blocks are connected to the movable permanent magnet through a connector. The fixed permanent magnet is provided with a limiting part one on the side near the movable magnetic guide block, and the movable magnetic guide block is provided with a limiting part two on the side near the fixed permanent magnet. The left preload spring and the right preload spring are located on the left and right sides of the movable magnetic assembly through the limiting parts one and two at corresponding positions.

3. The frequency-sensitive magnetorheological damper according to claim 2, characterized in that: The piston body also includes a piston sleeve, a fixing plate, and two piston end caps. The two piston end caps are respectively disposed on both sides of the piston sleeve. Two magnetic circuit assemblies are distributed radially along the piston sleeve, and the magnetic circuit assemblies are disposed axially between the two piston end caps. The fixed permanent magnet is disposed on the piston end cap, and the fixing plate is disposed on the outside of the piston end cap. The fixing plate, piston end caps, and piston sleeve form a closed shell.

4. The frequency-sensitive magnetorheological damper according to claim 1, characterized in that: The cylinder body includes a cylinder barrel and a cylinder end cap disposed on the side wall of the cylinder barrel. The piston connecting rod is slidably disposed in the cylinder barrel through the cylinder end cap. A sealing seat is disposed between the inner side of the cylinder end cap and the inner wall of the cylinder barrel. A sealing element is disposed on the contact surface of the sealing seat with the cylinder barrel and the piston connecting rod. A guide element is disposed between the sealing seat and the piston connecting rod.

5. The frequency-sensitive magnetorheological damper according to claim 4, characterized in that: The piston connecting rod has a receiving portion for accommodating the piston body, and a fixing nut is provided on the piston connecting rod. The piston body is disposed in the receiving portion and is limited by the receiving portion and the fixing nut.

6. The frequency-sensitive magnetorheological damper according to claim 3, characterized in that: The piston end cap has a waist-shaped flow channel hole on its end face, which communicates with the working flow channel.

7. The frequency-sensitive magnetorheological damper according to claim 1, characterized in that: A floating piston is slidably fitted inside the cylinder on the side away from the piston rod, and a second seal is provided between the floating piston and the cylinder.

8. The frequency-sensitive magnetorheological damper according to claim 1, characterized in that: The magnetic circuit assembly includes a magnetically conductive sleeve and a non-magnetically conductive sleeve, which are alternately arranged along the axial direction of the piston connecting rod.

9. The frequency-sensitive magnetorheological damper according to claim 3, characterized in that: The connection end face of the fixing plate and the magnetic circuit assembly is provided with a sealing element.

10. The frequency-sensitive magnetorheological damper according to claim 4, characterized in that: A first lifting ring is provided on the piston connecting rod, and a second lifting ring is provided on the side of the cylinder away from the piston connecting rod.

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