Magnetorheological damper with bionic honeycomb structure

Abstract

The magnetorheological damper of the bionic honeycomb structure comprises a cylinder body, a piston assembly and damping liquid filled in the cylinder body, the piston assembly comprises a piston rod and a bionic honeycomb piston arranged at the end of the piston rod, and a main channel and a honeycomb micro-channel which are connected in parallel are arranged in the bionic honeycomb piston; the damping fluid is guided to generate valve mode flow and shear mode flow at the same time; the damper further comprises a composite magnetic circuit system, and the composite magnetic circuit system comprises a first magnetic field generation unit used for providing a static bias magnetic field enhanced in the radial direction; the second magnetic field generation unit is used for providing an axial control magnetic field with adjustable strength; wherein the static bias magnetic field and the control magnetic field are overlapped at axial gaps between the honeycomb micro-channel and the bottom of the cylinder body and between the piston and the bottom of the cylinder body to form a composite gradient magnetic field with controllable strength and direction so as to cooperatively regulate and control damping force in a valve mode, a shear mode and an extrusion mode generated by the axial gaps. According to the damper, the damping force density and the magnetic field utilization rate in a compact space are remarkably improved.

Description

Technical Field

[0001] This disclosure generally relates to the field of vibration suppression technology, and more specifically to a biomimetic honeycomb structure magnetorheological damper. Background Technology

[0002] Engineering structures are prone to complex vibrations under external excitations such as wind loads and earthquakes. Traditional seismic design mainly relies on increasing structural stiffness and component dimensions to resist energy input, which may lead to irreversible damage to the main components. To improve structural recoverability and functional continuity, the use of damping devices to dissipate vibration energy has become an important development direction. Magnetorheological dampers, as a semi-active control device, have advantages such as fast response, adjustable damping, and low power consumption. However, their performance is still limited by problems such as a single operating mode, uneven magnetic field distribution, and insufficient heat dissipation. Traditional structures mostly adopt one of the valve mode or shear mode, resulting in low magnetic field utilization and difficulty in achieving high damping force output and dynamic response requirements in a compact space. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a biomimetic honeycomb structure magnetorheological damper to solve the above problems.

[0004] This application provides a biomimetic honeycomb magnetorheological damper, including a cylinder, a piston assembly, and a damping fluid filled therebetween. The piston assembly includes a piston rod and a biomimetic honeycomb piston located at its end. The biomimetic honeycomb piston has parallel main channels and honeycomb microchannels inside, which are used to guide the damping fluid to generate valve mode flow and shear mode flow simultaneously when the piston moves. The damper also includes a composite magnetic circuit system, comprising: The first magnetic field generating unit is used to provide a static bias magnetic field that is radially enhanced along the biomimetic honeycomb piston; The second magnetic field generating unit is used to provide an adjustable control magnetic field along the axial direction of the biomimetic honeycomb piston. The static bias magnetic field and the control magnetic field are superimposed at the axial gap between the honeycomb microchannel and the bottom of the piston and cylinder to form a composite gradient magnetic field with controllable intensity and direction, so as to synergistically regulate the damping force in the valve mode, shear mode and the extrusion mode generated by the axial gap.

[0005] According to the technical solution provided in the embodiments of this application, the main channel extends axially along the bionic honeycomb piston and one end is connected to the axial gap; multiple honeycomb microchannels are provided, the honeycomb microchannels extend radially along the bionic honeycomb piston and one end is connected to the main channel.

[0006] According to the technical solution provided in the embodiments of this application, the first magnetic field generating unit includes a Halbach permanent magnet array, which is arranged in a ring around the end of the biomimetic honeycomb piston away from the piston rod.

[0007] According to the technical solution provided in the embodiments of this application, the second magnetic field generating unit includes multiple coil groups, which are arranged axially along the bionic honeycomb piston and sleeved on the outside of the bionic honeycomb piston.

[0008] According to the technical solution provided in the embodiments of this application, the plurality of cellular microchannels are divided into a plurality of microchannel groups, and the cellular microchannels in each microchannel group are arranged circumferentially around the biomimetic cellular piston.

[0009] According to the technical solution provided in the embodiments of this application, a micro electromagnetic unit is embedded at one end of the cellular microchannel away from the main channel, which is used to locally enhance the intensity of the composite gradient magnetic field at the cellular microchannel.

[0010] According to the technical solution provided in the embodiments of this application, a heat dissipation jacket is provided on the side wall of the cylinder, and a capillary network is provided in the inner disk of the heat dissipation jacket, and the capillary network is filled with a phase change material.

[0011] According to the technical solution provided in the embodiments of this application, the damping fluid contains 30%-50% by volume sheet magnetic particles and nanoscale anti-settling agent.

[0012] According to the technical solution provided in the embodiments of this application, the sheet-like magnetic particles are carbonyl iron powder with a diameter-to-thickness ratio greater than 40:1, and the anti-settling agent is nano-silica.

[0013] According to the technical solution provided in the embodiments of this application, the piston rod is provided with a threading channel for the wire to pass through.

[0014] Compared with existing technologies, the advantages of this application are as follows: By using the parallel arrangement of the main channel and the honeycomb microchannel structure inside the biomimetic honeycomb piston, the valve mode and shear mode can be simultaneously activated during piston movement, significantly increasing the effective damping channel area and fluid shear rate; combined with the composite gradient magnetic field formed by the superposition of the radially enhanced static bias magnetic field and the axially adjustable control magnetic field at the honeycomb microchannel and axial gap, the synergistic control and coupling effect of the valve mode, shear mode, and compression mode are achieved. This design breaks through the limitation of the single working mode of traditional magnetorheological dampers, improves the magnetic field utilization rate, and thus increases the damping force density under the same spatial constraints. It also has millisecond-level continuous adjustment capability and better dynamic response characteristics, making it particularly suitable for vibration control scenarios with stringent requirements for space size and output performance. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram of the biomimetic honeycomb structure magnetorheological damper provided in this application; Figure 2 for Figure 1 A cross-sectional view of the biomimetic honeycomb structure magnetorheological damper shown. Figure 3 This is a schematic diagram of the piston assembly. Figure 4 for Figure 3 An enlarged structural diagram of point A in the piston assembly shown; Figure 5 for Figure 4 A cross-sectional view of the structure shown.

[0016] Reference numerals: 1. Cylinder body; 2. Piston rod; 3. Bionic honeycomb piston; 4. Main channel; 5. Honeycomb microchannel; 6. Halbach permanent magnet array; 7. Coil group; 8. Miniature electromagnetic unit; 9. Heat dissipation jacket; 10. Capillary network; 11. Wire; 12. Wire passage; 13. Top cover; 14. Sealing ring; 15. Partition; 16. Protective chamber; 17. First connector; 18. Second connector. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Please refer to Figures 1-5 This application provides a biomimetic honeycomb magnetorheological damper, including a cylinder 1, a piston assembly, and a damping fluid filled therebetween. The piston assembly includes a piston rod 2 and a biomimetic honeycomb piston 3 located at its end. The biomimetic honeycomb piston 3 has a parallel main channel 4 and a honeycomb microchannel 5 inside, which are used to guide the damping fluid to generate valve mode flow and shear mode flow simultaneously when the piston moves. The damper also includes a composite magnetic circuit system, comprising: The first magnetic field generating unit is used to provide a static bias magnetic field that is radially enhanced along the biomimetic honeycomb piston 3; The second magnetic field generating unit is used to provide an adjustable control magnetic field along the axis of the bionic honeycomb piston 3. The static bias magnetic field and the control magnetic field are superimposed at the axial gap between the honeycomb microchannel 5 and the bottom of the piston and cylinder 1 to form a composite gradient magnetic field with controllable intensity and direction, so as to synergistically regulate the damping force in the valve mode, shear mode, and extrusion mode generated by the axial gap. Specifically, the cylinder body 1 has a cylindrical structure with a hollow interior forming a damping cavity filled with damping fluid. One end of the cylinder body 1 has an opening communicating with the outside, and the other end is detachably connected to a second connector 18 via threads for connection to an external structure. The piston assembly includes a piston rod 2 and a biomimetic honeycomb piston 3 at its end. In this embodiment, the piston rod 2 and the biomimetic honeycomb piston 3 are integrally formed. After the assembled piston assembly is inserted into the damping cavity from the open end of the cylinder body 1, it is sealed and fixed at the open end of the cylinder body 1 by a top cover 13. The top cover 13 is connected to the end of the cylinder body 1 by bolts, and has a through hole in its middle through which the piston rod 2 extends out of the cylinder body 1. The end of the piston rod 2 extending out of the cylinder body 1 is detachably connected to a first connector 17 via threads for connection to an external structure. A sealing ring 14 is provided on the side of the top cover 13 near the damping cavity to seal the through hole of the top cover 13 and the gap between the top cover 13 and the cylinder body 1.

[0020] The biomimetic honeycomb piston 3 has parallel main channels 4 and honeycomb microchannels 5 inside. When the damper is not generating damping, the biomimetic honeycomb piston 3 is partially immersed in the damping fluid. When the piston moves axially within the cylinder 1, the damping fluid can enter the main channels 4 and honeycomb microchannels 5; as the biomimetic honeycomb piston 3 moves, the damping fluid is driven through the main channels 4 and honeycomb microchannels 5, generating valve-mode flow and shear-mode flow respectively, thus forming two basic damping mechanisms.

[0021] The damper also includes a composite magnetic circuit system, which consists of a first magnetic field generating unit and a second magnetic field generating unit. Both the first and second magnetic field generating units are mounted on the biomimetic honeycomb piston 3. The first magnetic field generating unit is a permanent magnet, used to provide a static bias magnetic field that is radially enhanced along the biomimetic honeycomb piston 3, ensuring that the damper has the basic function of generating magnetorheological damping. The second magnetic field generating unit is an adjustable magnet, used to provide a control magnetic field with adjustable intensity along the axial direction of the biomimetic honeycomb piston 3. The static bias magnetic field and the control magnetic field are superimposed within the honeycomb microchannel 5 region and at the axial gap between the piston end face and the bottom of the cylinder 1, forming a composite gradient magnetic field with controllable intensity and direction.

[0022] The biomimetic honeycomb structure magnetorheological damper provided in this embodiment achieves synergistic damping effects in three operating modes through the following methods: When vibration occurs, the piston rod 2 drives the bionic honeycomb piston 3 to move within the damping cavity. The axial gap between the bottom end of the bionic honeycomb piston 3 and the inner bottom wall of the cylinder 1 generates a compression mode damping effect. At the same time, the radial gap between the side wall of the bionic honeycomb piston 3 and the inner side wall of the cylinder 1 generates a shear mode damping effect.

[0023] When the piston rod 2 drives the bionic honeycomb piston 3 to move axially within the cylinder 1, the damping fluid is forced through the unique parallel flow channel structure inside the bionic honeycomb piston 3. Most of the fluid flows in a valve-mode through the main channel 4, forming the first level of damping driven by the pressure difference; simultaneously, some fluid is diverted to numerous honeycomb microchannels 5, creating a strong shear-mode flow between the microchannel walls and the fluid, generating the second level of damping; when the piston moves close to the bottom of the cylinder 1, the axial gap between the piston end face and the bottom of the cylinder further forms a vertically oriented extrusion flow, generating the third level of damping.

[0024] Meanwhile, the composite magnetic circuit system plays a crucial regulatory role: the radial static bias magnetic field generated by the first magnetic field generating unit and the axial control magnetic field generated by the second magnetic field generating unit are superimposed in the honeycomb microchannel 5 region and at the axial gap, forming a composite gradient magnetic field with controllable intensity and direction. This magnetic field induces a magnetorheological effect in the damping fluid flowing through the honeycomb microchannel 5, significantly enhancing the damping force in the shear mode; it also regulates the flow resistance at the outlet of the main channel 4, optimizing the valve mode efficiency; and it strengthens the damping effect in the extrusion mode at the axial gap.

[0025] Furthermore, the main channel 4 extends axially along the bionic honeycomb piston 3 and one end is connected to the axial gap; multiple honeycomb microchannels 5 are provided, the honeycomb microchannels 5 extend radially along the bionic honeycomb piston 3 and one end is connected to the main channel 4.

[0026] Specifically, such as Figures 3-5 As shown, the main channel 4 extends axially along the bionic honeycomb piston 3, with its lower end opening directly onto the bottom end face of the piston, thus maintaining communication with the axial gap between the end face of the bionic honeycomb piston 3 and the bottom of the cylinder 1. Multiple honeycomb microchannels 5 are provided, extending radially along the bionic honeycomb piston 3. The inner end of each honeycomb microchannel 5 is connected to the axial main channel 4, while its outer end penetrates the cylindrical outer wall of the bionic honeycomb piston 3, communicating with the radial gap between the bionic honeycomb piston 3 and the inner wall of the cylinder 1.

[0027] This flow channel structure constitutes a complete and efficient fluid path: when the piston moves, the damping fluid can enter the main channel 4 to generate valve-mode damping, and then be diverted into the honeycomb microchannels 5 within the main channel 4, where it undergoes strong shearing action. This parallel design allows the valve-mode and shear-mode to be excited simultaneously at different structural parts of the piston, rather than occurring sequentially, thereby significantly improving the speed of the damping response and the overall output density.

[0028] Furthermore, the first magnetic field generating unit includes a Halbach permanent magnet array 6, which is arranged in a ring around the end of the biomimetic honeycomb piston 3 away from the piston rod 2.

[0029] Specifically, such as Figure 2 and Figure 3 As shown, the first magnetic field generating unit specifically includes a Halbach permanent magnet array 6. This array is arranged in a ring at the end of the biomimetic honeycomb piston 3 away from the piston rod 2, i.e., at the bottom of the piston. The Halbach permanent magnet array 6 consists of multiple high-performance permanent magnets (such as neodymium iron boron magnets) arranged in a specific magnetization direction and combined into a ring structure, which is fixed to a pre-set annular groove or mounting platform at the bottom of the piston by means of interference fit, bonding, or mechanical pressing.

[0030] Its working principle and effect are as follows: Through the unique magnetic circuit design of the Halbach array, the magnetic field energy is concentrated and significantly enhanced in the radial direction of the biomimetic honeycomb piston 3. This radially enhanced static bias magnetic field mainly penetrates the honeycomb microchannel 5 region covering it and the surrounding area, providing a strong and stable background magnetic field for the magnetorheological fluid to undergo magnetorheological effects in shear mode in this region. This design constitutes the source of the static bias component in the composite gradient magnetic field, which is the basis for achieving efficient and stable shear mode damping, and is vector-superimposed with the control magnetic field generated by the second magnetic field generation unit to jointly form the composite gradient magnetic field with controllable intensity and direction.

[0031] Furthermore, the second magnetic field generating unit includes a plurality of coil groups 7, which are arranged axially along the bionic honeycomb piston 3 and sleeved on the outside of the bionic honeycomb piston 3.

[0032] Specifically, such as Figures 2 to 4 As shown, the second magnetic field generating unit specifically includes multiple independent coil groups 7. These coil groups 7 are formed by winding highly conductive enameled wire onto an insulating frame and are arranged at intervals along the axial direction of the biomimetic honeycomb piston 3. They are collectively sleeved on the outside of the biomimetic honeycomb piston 3 and fixed to the biomimetic honeycomb piston 3, remaining stationary when the piston moves axially.

[0033] Its core working principle is that when the control system supplies a controllable current to these coil groups 7, each coil group 7 will independently generate a control magnetic field mainly along the piston axis. By independently or collaboratively adjusting the magnitude and direction of the current in the coil groups 7 at different axial positions, a gradient magnetic field that varies along the axis can be dynamically created in the area where the honeycomb microchannels 5 and the axial gap are located at different stages of the piston's stroke.

[0034] This axial gradient magnetic field is vector-superimposed with the radial static bias magnetic field provided by the Halbach permanent magnet array 6, together achieving a composite gradient magnetic field with controllable strength and direction. This design allows the damper to perform more precise and dynamic coordinated control of the damping force in shear and compression modes according to the needs of vibration control, greatly improving the adjustable range of damping output.

[0035] Furthermore, the plurality of the honeycomb microchannels 5 are divided into a plurality of microchannel groups, and the honeycomb microchannels 5 in each microchannel group are arranged circumferentially around the biomimetic honeycomb piston 3.

[0036] Specifically, such as Figures 3 to 5 As shown, the honeycomb microchannels 5 are spatially divided into multiple microchannel groups, and the multiple honeycomb microchannels 5 are evenly distributed along the axial direction of the biomimetic honeycomb piston 3. Each microchannel group contains several honeycomb microchannels 5, which are uniformly arranged along the circumference of the piston at the same axial position of the biomimetic honeycomb piston 3, forming a ring-shaped microchannel array.

[0037] When the biomimetic honeycomb piston 3 moves axially within the cylinder 1, the uniformly distributed honeycomb microchannels 5 ensure a balanced fluid reaction force of the damping fluid on the piston, effectively avoiding lateral forces or piston wear that may be caused by uneven flow channel distribution, thus ensuring the smooth operation of the damper. The circumferentially uniform microchannel layout, combined with the axially arranged coil groups 7, allows the axial control magnetic field generated by each coil group 7 to uniformly penetrate its corresponding entire annular microchannel group region. This ensures that within this axial region, the magnetorheological fluid in all the honeycomb microchannels 5 undergoes rheological effects almost synchronously and with the same intensity, thereby achieving uniform and precise control of the shear damping force in this region.

[0038] Furthermore, a micro electromagnetic unit 8 is embedded at one end of the cellular microchannel 5 away from the main channel 4 to locally enhance the strength of the composite gradient magnetic field at the cellular microchannel 5.

[0039] Specifically, such as Figure 4 and Figure 5As shown, a micro electromagnetic unit 8 is embedded at the end of the honeycomb microchannel 5 furthest from the main channel 4, that is, at the port closest to the outer wall of the bionic honeycomb piston 3. The micro electromagnetic unit 8 consists of a micro magnetic core and a fine coil wound on it. After being insulated and encapsulated, it is embedded in the reserved mounting hole at the end of the microchannel by interference fit or bonding.

[0040] The core function of the micro-electromagnetic unit 8 is to locally enhance the strength of the composite gradient magnetic field at the honeycomb microchannel 5. Its working principle is as follows: when current passes through its internal coil, the micro-electromagnetic unit 8 generates an additional, highly concentrated enhanced magnetic field in a localized region at the microchannel port. This local magnetic field is superimposed on the main composite gradient magnetic field generated by the Halbach permanent magnet array 6 and the coil group 7, effectively compensating for potential magnetic field attenuation within the honeycomb microchannel 5 and ensuring that the magnetic field strength remains within the efficient operating range throughout the entire flow path of the honeycomb microchannel 5. This significantly increases the shear yield stress of the magnetorheological fluid within each independent honeycomb microchannel 5, thereby greatly enhancing the contribution of the shear mode to the total damping force. Furthermore, by independently controlling these micro-electromagnetic units 8, ultra-local fine-tuning of the damping characteristics of specific microchannels or groups of microchannels can be achieved, providing the damper with higher control dimensions and precision, enabling it to adapt to more complex vibration conditions.

[0041] Furthermore, a heat dissipation jacket 9 is provided on the side wall of the cylinder body 1, and a capillary network 10 is provided inside the heat dissipation jacket 9, and the capillary network 10 is filled with a phase change material.

[0042] Specifically, such as Figure 2 As shown, a heat dissipation jacket 9 is provided inside the side wall of the cylinder 1. This jacket is a closed cavity structure surrounding the main damping cavity. A capillary network 10 is tightly coiled within this heat dissipation jacket 9. The capillary network 10 is welded from metal capillaries (such as copper tubes) with excellent thermal conductivity, forming a dense mesh structure to maximize the heat exchange area. The capillary network 10 is filled with a phase change material.

[0043] When the damper is operating continuously, the heat generated by the internal shearing and flow of the damping fluid is conducted through the inner wall of the cylinder 1 to the heat dissipation jacket 9. The capillary network 10, with its large surface area and the high latent heat characteristics of the internal phase change material, efficiently and rapidly absorbs this heat. After absorbing heat, the phase change material undergoes a solid-liquid phase change, storing the heat as latent heat, thereby effectively suppressing a sharp rise in the internal temperature of the cylinder and stabilizing the operating temperature of the damping fluid within an ideal range. Optionally, the phase change material is a gallium-based liquid metal.

[0044] Furthermore, the damping fluid contains 30%-50% by volume sheet-like magnetic particles and nanoscale anti-settling agent.

[0045] Specifically, a volume fraction of 30%-50% provides a high filling rate for the magnetic particles, ensuring that the damping fluid can generate extremely high shear yield stress under the action of a composite gradient magnetic field. Compared with traditional spherical magnetic particles, plate-like magnetic particles are more likely to align their large planes along the direction of the magnetic field lines in a magnetic field. This orientation requires overcoming greater resistance to be broken when subjected to shear in the flow field, thus significantly enhancing the magnetorheological effect and improving the utilization efficiency of the magnetic field and the output of the damping force. Meanwhile, the nanoscale anti-settling agent forms a three-dimensional network structure in the damping fluid, generating a strong steric hindrance effect, which effectively prevents the high-density, high-content plate-like magnetic particles from settling and agglomerating due to gravity. This ensures the long-term uniformity and stability of the composition and magnetorheological properties of the damping fluid under long-term static conditions or different working postures, fundamentally solving the problem of easy settling of high-density magnetorheological fluids.

[0046] Furthermore, the sheet-like magnetic particles are carbonyl iron powder with a diameter-to-thickness ratio greater than 40:1, and the anti-settling agent is nano-silica.

[0047] Specifically, carbonyl iron powder with a diameter-to-thickness ratio greater than 40:1 is selected as the sheet-like magnetic particles. The extremely high diameter-to-thickness ratio enables the particles to achieve more complete and faster planar orientation under the action of a magnetic field. Its huge plane provides flow resistance far exceeding that of spherical particles in the direction perpendicular to the magnetic field, thus macroscopically manifesting as higher shear yield stress, which greatly improves the efficiency of magnetic energy conversion into damping force.

[0048] Nanoscale silica particles can be fully dispersed in the damping fluid base, constructing a stable three-dimensional spatial framework structure. This structure can physically support and bind high-density, high-content flake carbonyl iron powder, effectively resisting gravity-induced sedimentation and compaction, ensuring that the damping fluid system maintains compositional uniformity and performance stability under long-term static conditions or complex operating conditions.

[0049] Furthermore, the piston rod 2 is provided with a threading channel 12 for the wire 11 to pass through.

[0050] Specifically, such as Figure 1 , Figure 2 and Figure 5 As shown, a wire passage 12 is provided axially inside the piston rod 2. This passage runs through the piston rod 2, with one end extending to the connection point with the bionic honeycomb piston 3, and the other end opening at the end or side wall of the piston rod 2 that protrudes from the cylinder body 1. Its core function is to provide a protected internal path for the wires 11 connected to the coil group 7 and the micro electromagnetic unit 8 on the bionic honeycomb piston 3. All wires 11 originate from the components inside the piston, converge, pass through this wire passage 12, and finally extend to the outside of the cylinder body 1 to connect with the control unit.

[0051] Furthermore, such as Figure 2 As shown, a partition 15 is also provided in the damping cavity near the bottom of the cylinder 1. The partition 15 is made of graphite wound gasket. The partition 15 separates a sealed protective chamber 16 in the damping cavity. The protective chamber 16 is filled with gas so that the partition 15 forms a compressible buffer pad, dynamically adapting to the volume changes caused by the piston rod 2 moving in and out, thereby maintaining the pressure of the entire chamber within a relatively stable range.

[0052] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A magneto-rheological damper of a biomimetic honeycomb structure, characterized in that, The damper comprises a cylinder (1), a piston assembly and a damping liquid filled therebetween, the piston assembly comprises a piston rod (2) and a bionic honeycomb piston (3) arranged at the end of the piston rod (2), The bionic honeycomb piston (3) is internally provided with parallel main channels (4) and honeycomb micro-channels (5) for guiding the damping liquid to generate valve mode flow and shear mode flow during the movement of the piston; The damper further comprises a composite magnetic circuit system, which comprises: A first magnetic field generating unit for providing a static bias magnetic field which is enhanced radially along the bionic honeycomb piston (3); A second magnetic field generating unit for providing an adjustable strength control magnetic field axially along the bionic honeycomb piston (3); Wherein, the static bias magnetic field and the control magnetic field superimpose at the honeycomb micro-channels (5) and the axial gap between the piston and the bottom of the cylinder (1) to form a composite gradient magnetic field with controllable strength and direction, so as to cooperatively control the damping force in the valve mode, shear mode and extrusion mode generated by the axial gap.

2. The biomimetic honeycomb-structured magnetorheological damper of claim 1, wherein, The main channels (4) extend axially along the bionic honeycomb piston (3) and are communicated with the axial gap at one end; the honeycomb micro-channels (5) are provided in plurality, and extend radially along the bionic honeycomb piston (3) and are communicated with the main channels (4) at one end.

3. The biomimetic honeycomb-structured magnetorheological damper of claim 2, wherein, The first magnetic field generating unit comprises a Halbach permanent magnet array (6) arranged at the end of the bionic honeycomb piston (3) away from the piston rod (2).

4. The biomimetic honeycomb-structured magnetorheological damper of claim 3, wherein, The second magnetic field generating unit comprises a plurality of coil groups (7), and the plurality of coil groups (7) are arranged axially along the bionic honeycomb piston (3) and are sleeved outside the bionic honeycomb piston (3).

5. The biomimetic honeycomb-structured magnetorheological damper of claim 4, wherein, The plurality of honeycomb micro-channels (5) are divided into a plurality of micro-channel groups, and the honeycomb micro-channels (5) in each micro-channel group are arranged circumferentially around the bionic honeycomb piston (3).

6. The biomimetic cellular structure magnetorheological damper of claim 5, wherein, A micro electromagnetic unit (8) is embedded at the end of the honeycomb micro-channel (5) away from the main channel (4) for locally enhancing the strength of the composite gradient magnetic field at the honeycomb micro-channel (5).

7. The biomimetic cellular structure magnetorheological damper of claim 1, wherein, The side wall of the cylinder (1) is provided with a heat dissipation interlayer (9), and a capillary network (10) is arranged in the heat dissipation interlayer (9), and a phase change material is filled in the capillary network (10).

8. The biomimetic cellular structure magnetorheological damper of claim 1, wherein, The damping liquid contains 30%-50% volume fraction of flaky magnetic particles and nanoscale anti-settling agent.

9. The biomimetic cellular structure magnetorheological damper of claim 8, wherein, The flaky magnetic particles are carbonyl iron powder with a diameter-thickness ratio greater than 40:1, and the anti-settling agent is nanoscale silicon dioxide.

10. The biomimetic cellular structure magnetorheological damper of claim 1, wherein, A threading channel (12) is arranged on the piston rod (2) for passing a wire (11) therethrough.

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