A large-stroke progressive high-energy-consumption mr-stf damper and method
By combining the main and auxiliary piston rods and MR-STF material, the damper achieves graded progressive output and high energy consumption, solving the problems of small stroke and poor energy consumption of traditional dampers in the field of bridge pier collision protection, and improving the anti-ship collision performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGSU UNIV
- Filing Date
- 2023-10-18
- Publication Date
- 2026-06-09
AI Technical Summary
Traditional dampers are not widely used in bridge pier collision protection, especially anti-ship collision dampers which have a short stroke and cannot achieve graded force output, resulting in poor energy dissipation.
By adopting a structure in which the main and auxiliary piston rods are interlocked, and combining MR-STF material with main pistons of different diameters, the damper achieves graded progressive power output and high energy consumption through the coordinated work of multiple pistons.
By increasing the damper stroke within the same size, multiple levels of damping force can be provided to adapt to different impact depths, improve anti-ship collision performance, and achieve high damping energy dissipation effect.
Smart Images
Figure CN117248503B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of collision avoidance technology, specifically to a large-push progressive high-energy-consuming MR-STF damper and method. Background Technology
[0002] Traditional impact dampers are mostly used in mechanical or automotive vibration reduction, but their application in bridge pier impact protection is limited, especially ship collision dampers specifically designed for bridge pier impact protection. Shear-thickening materials exhibit significant rate-sensitive characteristics, enabling them to adapt to external environmental excitations. However, devices developed based on shear-thickening materials are passive devices, and their mechanical properties cannot be directionally controlled. Magnetorheological materials, on the other hand, exhibit significant magnetostrictive properties, allowing for directional adjustment of mechanical properties under magnetic field excitation, but these properties remain unchanged once the magnetic field is removed. MR-STF combines the advantages of both materials, representing a multifunctional shear-thickening material that integrates shear hardening and magnetorheological coupling effects.
[0003] Although the "impact-resistant magnetorheological damper" disclosed in Chinese patent application number CN201511011227.7 has good buffering performance under high-speed impact, its damper stroke is small and it cannot achieve different outputs for different displacements.
[0004] Although the "graded energy dissipation damper" disclosed in Chinese patent application number CN202010844834.6 can achieve phased energy dissipation under different conditions, its damper has poor impact energy dissipation effect. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides a large-stroke progressive high-energy-dissipation MR-STF damper, overcoming the deficiencies of traditional dampers such as short stroke, inability to deliver force in stages upon impact, and poor shock resistance and energy dissipation. Compared to existing dampers, this invention achieves a longer stroke for the same dimensions by interlocking the main and auxiliary piston rods, making it more suitable for ship collision protection; it achieves a graded progressive force output effect by having three pistons work collaboratively in different cylinders at different impact depths; and it achieves good shock resistance and energy dissipation by using MR-STF material and coordinating two main pistons of different diameters, thus improving the damper's output.
[0006] The present invention achieves the above-mentioned technical objectives through the following technical means.
[0007] A high-energy-consuming MR-STF damper with large thrust includes a secondary piston rod, a main piston rod, and a main cylinder; the middle section of the main piston rod is disposed in the main cylinder, and both ends of the main piston rod protrude from the main cylinder;
[0008] The main piston rod has a secondary cylinder and a supplementary groove. One end of the secondary piston rod passes through the secondary cylinder and extends into the supplementary groove; the other end of the secondary piston rod protrudes from the secondary cylinder.
[0009] Both the main cylinder and the auxiliary cylinder are filled with magnetorheological shear thickening fluid.
[0010] In the above scheme, a main piston A and a main piston B are movably mounted on the main piston rod; a secondary piston is mounted on the secondary piston rod.
[0011] In the above scheme, excitation coils are provided on the main piston A, the main piston B and the auxiliary piston; the excitation coils are energized to change the mechanical properties of the magnetorheological shear thickening liquid.
[0012] In the above scheme, an annular pusher is provided between the main piston A and the main piston B; an annular pusher is also provided on the main piston A near the left cylinder head.
[0013] In the above scheme, the diameter of the main piston A is smaller than the diameter of the main piston B.
[0014] In the above scheme, a left lifting lug is provided on the auxiliary piston rod protruding from the auxiliary cylinder body end; an auxiliary cylinder head and a right lifting lug are respectively provided on the main piston rod protruding from the main cylinder body end.
[0015] In the above scheme, the left and right lifting lugs are used to connect external components.
[0016] In the above scheme, both ends of the main cylinder and the auxiliary cylinder are provided with seals.
[0017] The working method of a large-aperture progressive high-energy-consuming MR-STF damper.
[0018] Phase 1: The auxiliary piston rod is subjected to an impact force, and the magnetorheological shear thickening fluid in the main cylinder and auxiliary cylinder works. The auxiliary piston rod drives the auxiliary piston to work to the right, while the main piston rod remains stationary. When the auxiliary piston moves to the rightmost end of the auxiliary cylinder, the auxiliary piston rod moves to the rightmost end of the compensation groove, and the auxiliary piston stops moving. During this process, the damping force is generated by the magnetorheological shear thickening fluid through the energized auxiliary piston. The main pistons A and B do not work.
[0019] Second stage: Under the action of continuously increasing external force, the auxiliary piston rod pushes the main piston rod to move to the right, and the ring pusher moves with the main piston rod, starting to push the main piston A to move to the right. At this time, the main piston B is stationary. At this time, the damping force is generated by the magnetorheological shear thickening liquid through the energized main piston A. The auxiliary piston and the main piston B are not working.
[0020] Third stage: Under the action of continuously increasing external force, the ring pusher moves with the main piston A and comes into contact with the main piston B. At this time, the main piston A and the main piston B move together with the main piston rod. At this time, the damping force is generated by the magnetorheological shear thickening liquid through the energized main piston A and the main piston B; the auxiliary piston does not work.
[0021] In the above scheme, if the excitation coil is energized, the mechanical properties of the magnetorheological shear thickening fluid change, and the damping force that can be provided is no less than 150.8KN in the first stage; no less than 583.2KN in the second stage; and no less than 1346.4KN in the third stage.
[0022] Beneficial effects:
[0023] 1. In this invention, by setting up two main pistons, one auxiliary piston, and main and auxiliary cylinders to work together, the energy consumption of the damper is divided into three stages, so that different pistons can work at different impact displacement depths and provide different damping forces. This invention makes the damping force adjustable under constant current, and multiple working modes can provide better dynamic response and control performance, adapt to different working conditions, and effectively improve the applicability of the damper.
[0024] 2. This invention sets up a secondary cylinder inside the main piston rod, so that the secondary piston rod and the main piston rod are sleeved together. When displaced, the secondary piston rod can extend and retract into the main piston rod, and then the main piston rod moves. Under the same size, it can achieve a larger stroke than the traditional damper, thereby effectively increasing the impact stroke when subjected to impact, improving the energy dissipation effect, and providing more buffer energy dissipation space.
[0025] 3. This invention, by setting two main pistons of different diameters within the main cylinder, allows one piston to operate under small displacements, while both pistons work together under large displacements, significantly improving the output force of the impact damper. It features high damping energy dissipation, combines rate-sensitive and magnetic-sensitive characteristics, and can achieve a maximum single output force of 1346.4 kN.
[0026] 4. In this invention, a compensation groove is formed inside the main piston rod to compensate for the volume of displacement of the auxiliary piston, which is simpler and more durable than the traditional setting of an elastic compensation cavity.
[0027] 5. In this invention, an annular pusher, i.e. an annular clamp, is provided on the main piston rod to push the main piston to move, thereby causing the main piston to push the magnetorheological shear thickening liquid to generate a damping force.
[0028] 6. In this invention, main piston A and main piston B are movably mounted on the main piston rod. When the main piston rod moves, main piston A and main piston B do not move with the main piston. They only move after being pushed by the annular pusher, thereby achieving separate movement of main piston A and main piston B. In the second stage, only main piston A pushes the magnetorheological shear thickening fluid to generate damping force. In the third stage, main piston A and main piston B move simultaneously to push the magnetorheological shear thickening fluid to generate damping force, thus adapting to higher damping force changes. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the overall structure of a large-shift progressive high-energy-consuming MR-STF damper according to the present invention.
[0030] Figure 2 for Figure 1 A schematic diagram of the main piston rod structure involved in the process;
[0031] Figure 3 for Figure 1 A schematic diagram of the first stage of the working process of the device in the diagram;
[0032] Figure 4 for Figure 1 A schematic diagram of the second stage of the working process of the device in the diagram;
[0033] Figure 5 for Figure 1 The diagram shows the third stage of the working process of the device.
[0034] Figure label:
[0035] 1-Left lifting lug; 2-Secondary piston rod; 3-Connecting bolt; 4-Secondary piston; 5-Main piston rod; 6-Left cylinder head; 7-Main piston A; 8-Main piston B; 9-Right cylinder head; 10-Right lifting lug; 11-Secondary cylinder head; 12-Excitation coil; 13-MR-STF chamber I; 14-Secondary cylinder body; 15-Seal; 16-Annular thruster; 17-MR-STF chamber II; 18-Supplementary groove; 19-Main cylinder body. Detailed Implementation
[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0039] A high-energy-consuming MR-STF damper with large thrust includes a secondary piston rod 2, a main piston rod 5, and a main cylinder 19; the middle section of the main piston rod 5 is disposed inside the main cylinder 19, and both ends of the main piston rod 5 protrude from the main cylinder 19.
[0040] The main piston rod 5 is provided with a secondary cylinder 14 and a supplementary groove 18. One end of the secondary piston rod 2 passes through the secondary cylinder 14 and extends into the supplementary groove 18; the other end of the secondary piston rod 2 protrudes out of the secondary cylinder 14.
[0041] Both the main cylinder 19 and the auxiliary cylinder 14 are filled with magnetorheological shear thickening fluid.
[0042] In the above scheme, the main piston rod 5 is movably equipped with a main piston A7 and a main piston B8; the auxiliary piston rod 2 is equipped with an auxiliary piston 4.
[0043] In the above scheme, excitation coils 12 are provided on the main piston A7, the main piston B8 and the auxiliary piston 4; the excitation coils 12 are energized to change the mechanical properties of the magnetorheological shear thickening liquid.
[0044] In the above scheme, an annular pusher 16 is provided between the main piston A7 and the main piston B8; an annular pusher 16 is also provided on the main piston A7 near the left cylinder head 6.
[0045] In the above scheme, the diameter of the main piston A7 is smaller than the diameter of the main piston B8.
[0046] In the above scheme, the auxiliary piston rod 2 is provided with a left lifting lug 1 protruding from the auxiliary cylinder body 14; the main piston rod 5 is provided with an auxiliary cylinder head 11 and a right lifting lug 10 protruding from the main cylinder body 19.
[0047] In the above scheme, the left lug 1 and the right lug 10 are used to connect external components.
[0048] In the above scheme, both ends of the main cylinder 19 and the auxiliary cylinder 14 are provided with seals 15.
[0049] Combined with appendix Figure 1 As shown, a high-energy-consuming, progressive MR-STF damper with large thrust includes a left lifting lug 1, a secondary piston rod 2, a connecting bolt 3, a secondary piston 4, a main piston rod 5, a left cylinder head 6, a main piston A7, a main piston B8, a right cylinder head 9, a right lifting lug 10, a secondary cylinder head 11, an excitation coil 12, an MR-STF chamber I 13, a secondary cylinder body 14, a seal 15, an annular pusher 16, an MR-STF chamber II 17, a compensation groove 18, and a main cylinder body 19. One end of the main piston rod 5 extends out of the left cylinder head 6 and connects to the secondary cylinder head 11, while the other end extends out of the right cylinder head 9 and connects to the right lifting lug 10. The auxiliary cylinder body 14 is located to the left of the compensation groove 18 and is located within the main piston rod 5; one end of the auxiliary piston rod 2 extends out of the auxiliary cylinder head 11 and connects to the left lifting lug 1, and the other end is located in the compensation groove 18 within the main piston rod 5; the auxiliary piston 4 is located within the auxiliary cylinder body 14 and works as the auxiliary piston rod 2 moves; the auxiliary cylinder head 11 is located to the left of the left cylinder head 6 and is used to seal the auxiliary cylinder body 14 within the main piston rod 5; the main cylinder body 19 is sealed by the left cylinder head 6 and the right cylinder head 9, and the main piston A7 and the main piston B8 are located within the main cylinder body 19 and connected in series on the main piston rod 5; two annular pushers 16 are located within the main cylinder body 19 and move as the main piston rod 5 moves, one annular pusher 16 is located to the left of the main piston A7 and is in contact with it, and the other is located between the main piston A7 and the main piston B8, at a certain distance from the main piston A7 and the main piston B8; the annular pusher 16 is an annular clip or annular piece mounted on the main piston rod 5. Excitation coils 12 are wound around the auxiliary piston 4, main piston A7, and main piston B8; MR-STF chamber I 13 and MR-STF chamber II 17 are filled with magnetorheological shear thickening fluid; seals 15 are provided at both ends of the main and auxiliary cylinders; cylinder covers are fixed to the cylinders by connecting bolts 3. When the excitation coils 12 are energized, they alter the arrangement and interaction of magnetic particles in the magnetorheological shear thickening fluid, thereby changing the mechanical properties of the material.
[0050] The specific parameters of this invention are as follows: the diameter of the main piston rod 5 is 125 mm, the diameter of the main piston A7 is 247 mm, the diameter of the main piston B8 is 248 mm, the inner diameter of the main cylinder 19 is 250 mm, the wall thickness of the main cylinder 19 is 25 mm, the inner diameter of the auxiliary cylinder 14 is 90 mm, the diameter of the auxiliary piston rod 2 is 45 mm, the diameter of the auxiliary piston 4 is 88 mm, the viscosity of the magnetorheological shear thickening fluid is about 11.8 Pa / s, and the shear yield strength is about 80 kPa.
[0051] Working principle:
[0052] Phase 1: As Figure 3 As shown, when the auxiliary piston rod 2 is subjected to an impact force, the magnetorheological shear thickening fluid in the main cylinder 19 and auxiliary cylinder 14 is activated, and the auxiliary piston rod 2 drives the auxiliary piston 4 to work to the right, while the main piston rod 5 remains stationary. When the auxiliary piston 4 moves to the rightmost end of the auxiliary cylinder 14, the auxiliary piston rod 2 moves to the rightmost end of the compensation groove 18, and the auxiliary piston 4 stops moving. During this process, the damping force is generated by the magnetorheological shear thickening fluid pushed by the energized auxiliary piston 4, and the main pistons A7 and B8 do not work. The calculated maximum damping force in the first stage is approximately 150.8 kN.
[0053] Phase Two: As Figure 4 As shown, under the continuously increasing external force, the auxiliary piston rod 2 pushes the main piston rod 5 to the right, and the annular pusher 16 moves with the main piston rod 5, starting to push the main piston A7 to the right. At this time, the main piston B8 remains stationary. The damping force is generated by the magnetorheological shear thickening liquid pushed by the energized main piston A7, and the auxiliary piston 4 and the main piston B8 do not work. The maximum damping force in the second stage is approximately 583.2 kN.
[0054] Phase Three: As Figure 5 As shown, under the continuously increasing external force, the annular pusher 16 moves with the main piston A7 and comes into contact with the main piston B8. At this time, the main piston A7 and the main piston B8 move together with the main piston rod 5. The damping force is generated by the magnetorheological shear thickening liquid pushed by the energized main piston A7 and the main piston B8. The auxiliary piston 4 does not work. The maximum damping force in the third stage is approximately 1346.4 kN.
[0055] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.
Claims
1. A method for operating a large-shift progressive high-energy-consuming MR-STF damper, characterized in that, It includes a secondary piston rod (2), a main piston rod (5), and a main cylinder (19); the middle section of the main piston rod (5) is located inside the main cylinder (19), and both ends of the main piston rod (5) protrude from the main cylinder (19); a main piston A (7) and a main piston B (8) are movably mounted on the main piston rod (5); a secondary piston (4) is mounted on the secondary piston rod (2); an annular pusher (16) is mounted between the main piston A (7) and the main piston B (8); an annular pusher (16) is also mounted on the main piston A (7) near the left cylinder head (6); the... The main piston rod (5) is provided with a secondary cylinder (14) and a supplementary groove (18). One end of the secondary piston rod (2) passes through the secondary cylinder (14) and extends into the supplementary groove (18); the other end of the secondary piston rod (2) protrudes from the secondary cylinder (14); both the main cylinder (19) and the secondary cylinder (14) are filled with magnetorheological shear thickening fluid; the specific steps include: First stage: the secondary piston rod (2) is subjected to impact force, the magnetorheological shear thickening fluid in the main cylinder (19) and the secondary cylinder (14) works, the secondary piston rod (2) drives the secondary piston (4) to work to the right, the main ... The piston rod (5) remains stationary; when the auxiliary piston (4) moves to the rightmost end of the auxiliary cylinder (14), the auxiliary piston rod (2) moves to the rightmost end of the compensation groove (18), and the auxiliary piston (4) stops moving; during this process, the damping force drives the magnetorheological shear thickening liquid to be generated through the energized auxiliary piston (4); the main piston A (7) and the main piston B (8) do not work; second stage: under the action of the continuously increasing external force, the auxiliary piston rod (2) pushes the main piston rod (5) to the right, and the ring pusher (16) moves with the main piston rod (5) and begins to push the main piston A (7) to the right. During the first stage, the main piston B (8) remains stationary. At this time, the damping force drives the magnetorheological shear thickening liquid through the energized main piston A (7). The auxiliary piston (4) and the main piston B (8) do not work. In the third stage, under the action of the continuously increasing external force, the ring pusher (16) moves with the main piston A (7) and comes into contact with the main piston B (8). At this time, the main piston A (7) and the main piston B (8) move together with the main piston rod (5). At this time, the damping force drives the magnetorheological shear thickening liquid through the energized main piston A (7) and the main piston B (8). The auxiliary piston (4) does not work.
2. The operating method of the large-shift progressive high-energy-consuming MR-STF damper according to claim 1, characterized in that, Excitation coils (12) are provided on the main piston A (7), main piston B (8) and auxiliary piston (4); the excitation coils (12) are energized to change the mechanical properties of the magnetorheological shear thickening liquid.
3. The operating method of the large-shift progressive high-energy-consuming MR-STF damper according to claim 1, characterized in that, The diameter of main piston A (7) is smaller than the diameter of main piston B (8).
4. The operating method of the large-shift progressive high-energy-consuming MR-STF damper according to claim 1, characterized in that, The auxiliary piston rod (2) is provided with a left lifting lug (1) protruding from the auxiliary cylinder body (14); the main piston rod (5) is provided with an auxiliary cylinder head (11) and a right lifting lug (10) protruding from the main cylinder body (19).
5. The operating method of the large-shift progressive high-energy-consuming MR-STF damper according to claim 4, characterized in that, The left lug (1) and right lug (10) are used to connect external components.
6. The operating method of the large-shift progressive high-energy-consuming MR-STF damper according to claim 1, characterized in that, Both ends of the main cylinder (19) and the auxiliary cylinder (14) are provided with seals (15).
7. The operating method of the large-shift progressive high-energy-consuming MR-STF damper according to claim 2, characterized in that, If the excitation coil (12) is energized, the mechanical properties of the magnetorheological shear thickening liquid change, and the damping force that can be provided is no less than 150.8KN in the first stage and no less than 583.2KN in the second stage. The maximum damping force in the third stage is no less than 1346.4 kN.