Intelligent damper based on laminated MRE and damping base

Abstract

The utility model provides an intelligent damper based on laminated MRE and a damping base. The intelligent damper based on the laminated MRE comprises an outer sleeve and an inner sleeve which can move relatively, the outer sleeve comprises a first sleeve body and a second sleeve body, the inner sleeve comprises a third sleeve body, the end of the third sleeve body is inserted into an annular cavity formed by the first sleeve body and the second sleeve body, and the head of the second sleeve body is connected with the bottom wall of the third sleeve body through an elastic piece. A first annular cavity is formed between the first sleeve and the third sleeve, a second annular cavity is formed between the third sleeve and the second sleeve, a plurality of laminated MRE units are arranged in the circumferential direction of the first annular cavity and the circumferential direction of the second annular cavity at intervals, and each laminated MRE unit is correspondingly sleeved with an enameled coil. According to the intelligent damper, the coil is directly wound around the MRE, and under the same MRE effect, the current needing to be connected can be reduced, so that the calorific value is reduced, and the intelligent damper is safer and more suitable for continuous power-on work.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration reduction and isolation, in particular to an intelligent damper and a vibration reduction base based on laminated MRE. Background Art

[0002] A typical viscoelastic damper is composed of a viscoelastic material and a constrained steel plate. Under the action of repeated forces, the steel plate produces relative displacement, causing the viscoelastic material to produce reciprocating shear deformation, thereby dissipating energy. The energy dissipation capacity of the viscoelastic damper increases with the increase of the excitation frequency. Each damper has its own excitation frequency range. The viscoelastic damper mainly uses traditional rubber materials. Even after multiple structural optimizations, the shortcoming of fixed stiffness has never been effectively solved. When the earthquake frequency is close to the natural frequency of the structure, resonance is likely to occur. At this time, the traditional damper may not only be difficult to achieve a shock absorption effect, but may even cause more serious damage.

[0003] With the emergence of new intelligent materials such as magnetorheological elastomers in recent years, vibration reduction and isolation technology has made further progress. MRE (magnetorheological elastomer) has many advantages. When an external magnetic field is applied, a more obvious magnetorheological effect will be produced, and its stiffness, damping and other characteristics will also change accordingly. MRE dampers have the advantages of reversibility, continuity, and fast response speed, which greatly improves the frequency sensitivity of traditional rubber materials. Research on semi-active seismic isolation devices based on MRE has become a trend.

[0004] However, the existing MRE usually uses a continuous circle of MRE, and the magnetic flux lines of a continuous circle of MRE are radial. Therefore, the current intensity cannot be very high, resulting in a low magnetic induction intensity, which affects the shock absorption effect. Utility Model Content

[0005] The main purpose of the utility model is to provide an intelligent damper based on laminated MRE, aiming to improve its shock absorption effect.

[0006] To achieve the above-mentioned purpose, the utility model provides an intelligent damper based on laminated MRE, comprising an outer sleeve and an inner sleeve which are relatively movable, wherein:

[0007] The outer sleeve includes a first sleeve and a second sleeve located inside the first sleeve, and the inner sleeve includes a third sleeve. The end of the third sleeve is inserted into the first sleeve and the second sleeve to form an annular cavity. The head of the second sleeve is connected to the bottom wall of the third sleeve by an elastic member. A first annular chamber is formed between the first sleeve and the third sleeve, and a second annular chamber is formed between the third sleeve and the second sleeve. A plurality of stacked MRE units are arranged at intervals in the circumferential direction of the first annular chamber and the second annular chamber, and an enameled coil is correspondingly sleeved on the outside of each stacked MRE unit, and the enameled coil is located inside the annular cavity.

[0008] Preferably, magnetic conductive plates are fixed on the inner wall of the first sleeve and the outer wall of the second sleeve, an enameled coil is wound around the inner side of the magnetic conductive plate, the first sleeve, the second sleeve, the second sleeve and the magnetic conductive plate are all made of magnetic conductive steel, and magnetic conductive plates are arranged on both sides of each laminated MRE unit.

[0009] Preferably, the third sleeve is inserted into the head of the first sleeve to fix a rolling assembly, which includes a first end plate and a sliding ball mounted on the first end plate. The sliding ball is rollingly connected to the side walls of the first sleeve and the second sleeve, and the sliding ball is made of non-magnetic steel.

[0010] Preferably, a rolling assembly is also installed on the middle portion of the third sleeve inserted into the interior of the first sleeve.

[0011] Preferably, a buffer pad is fixed on the side of the end plate facing the magnetic guide plate.

[0012] Preferably, displacement acceleration sensors are installed inside the inner sleeve and the outer sleeve.

[0013] Preferably, at least two groups of laminated MREs are arranged in the length direction of the first sleeve, each group of laminated MREs comprises a plurality of laminated MRE units spaced apart circumferentially, and magnetic conductive plates and coils are arranged on both sides of each group of laminated MREs.

[0014] Preferably, the head of the second sleeve is closed.

[0015] Preferably, a gap is provided between the enameled coil and the corresponding laminated MRE unit.

[0016] The utility model further proposes a shock-absorbing base, comprising the above-mentioned intelligent damper based on laminated MRE.

[0017] Compared with the solution in the prior art that the coil is wound around the middle column (the prior art first generates a magnetic field in the column, and then transmits it to the MRE, and there will be energy loss on the way. There will be losses in the loop, and the farther away from the center of the coil, the greater the loss. Only the magnetic field in the center of the coil is the largest), the intelligent damper based on the laminated MRE proposed in the utility model directly wraps the coil around the MRE, and a magnetic field is directly generated inside the MRE. The magnetic field is much higher than the magnetic field in the prior art, which can improve the MRE effect. Under the same MRE effect, the current required to be passed can be reduced, thereby reducing heat generation, making it safer and more suitable for continuous power-on operation. In addition, a plurality of laminated MRE units are arranged at intervals in the circumferential direction of the first annular chamber and the second annular chamber. Compared with the solution of a full circle of laminated MRE in the prior art, it is not a radial magnetic flux line, which can improve the magnetic induction intensity and thus improve the shock absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional structural schematic diagram of a preferred embodiment of the intelligent damper based on laminated MRE of the utility model;

[0019] Figure 2 It is a schematic cross-sectional structure diagram of the outer sleeve of the intelligent damper based on laminated MRE of the utility model;

[0020] Figure 3 It is a schematic cross-sectional structure diagram of the inner sleeve in the intelligent damper based on laminated MRE of the utility model;

[0021] Figure 4 for Figure 1 A schematic cross-sectional view of the structure in the AA direction is shown;

[0022] Figure 5 for Figure 1 A schematic cross-sectional structure diagram along the BB direction is shown;

[0023] Figure 6 This is a magnetic circuit diagram of a preferred embodiment of the intelligent damper based on laminated MRE of the utility model.

[0024] In the figure: 1-outer sleeve, 2-inner sleeve, 3-sliding ball, 4-buffer pad, 5-magnetic plate, 6-first stacked MRE unit, 7-second stacked MRE unit, 8-enamelled coil, 9-displacement acceleration sensor, 10-elastic part, 11-first sleeve, 12-second sleeve, 13-third sleeve.

[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] The utility model provides an intelligent damper based on laminated MRE.

[0029] Reference Figures 1 to 5 In this preferred embodiment, a smart damper based on laminated MRE includes an outer sleeve 1 and an inner sleeve 2 which are relatively movable, wherein:

[0030] The outer sleeve 1 includes a first sleeve 11 and a second sleeve 12 located inside the first sleeve 11, and the inner sleeve 2 includes a third sleeve 13. The end of the third sleeve 13 is inserted into the first sleeve 11 and the second sleeve 12 to form an annular cavity. The head of the second sleeve 12 is connected to the bottom wall of the third sleeve 13 by an elastic member 10 (a spring may be used). A first annular chamber is formed between the first sleeve 11 and the third sleeve 13, and a second annular chamber is formed between the third sleeve 13 and the second sleeve 12. A plurality of laminated MRE units are arranged at intervals in the circumferential direction of the first annular chamber and the second annular chamber, and an enameled coil 8 is correspondingly sleeved on the outside of each laminated MRE unit, and the enameled coil 8 is located inside the annular cavity.

[0031] Located in the first annular chamber is a first stacked MRE unit 6 , and located in the second annular chamber is a second stacked MRE unit 7 .

[0032] The first sleeve 11 and the second sleeve 12 are connected by the non-magnetic high-strength steel of the end, and a pin is also provided on the outside of the end, which can be connected to the pin seat and then connected to the external structure. This installation method is more flexible. The end of the third sleeve 13 is also connected to the pin. The structure and materials of the laminated MRE unit are all existing technologies. The material is made of silicone rubber and carbonyl iron powder mixed in a specific proportion under certain conditions, and connected to other parts by a high-strength adhesive.

[0033] Specifically, in this embodiment, referring to Figure 1, the inner wall of the first sleeve 11 and the outer wall of the second sleeve 12 are both fixed with a magnetic plate 5 (which can be welded to the side walls of the first sleeve 11 and the second sleeve 12), the inner side of the magnetic plate 5 is wound with an enameled coil 8 (the enameled coil 8 is a coil with several turns wound on the inner wall of the magnetic plate 5), the first sleeve 11, the second sleeve 12, the second sleeve 12 and the magnetic plate 5 are all made of magnetic steel (high-strength magnetic steel). Magnetic plates 5 are provided on both sides of each laminated MRE unit. For the laminated MRE unit inside the first annular chamber, its magnetic plate 5 is fixed to the inner wall of the first sleeve 11, and for the laminated MRE unit inside the second annular chamber, its magnetic plate 5 is fixed to the inner wall of the second sleeve 12.

[0034] Furthermore, the third sleeve 13 is inserted into the head of the first sleeve 11 to fix the rolling assembly, which includes a first end plate and a sliding ball 3 mounted on the first end plate, and the sliding ball 3 is rollingly connected with the side walls of the first sleeve 11 and the second sleeve 12, and the sliding ball 3 is made of non-magnetic steel. By setting the rolling assembly, the movement between the outer sleeve 1 and the inner sleeve 2 is guided.

[0035] Furthermore, a rolling assembly is also installed on the middle part of the third sleeve 13 inserted into the first sleeve 11. That is, rolling assemblies are arranged on both sides of the assembly composed of the laminated MRE, so as to ensure smooth sliding between the outer sleeve 1 and the inner sleeve 2.

[0036] Furthermore, a buffer pad 4 is fixed on the side of the end plate facing the magnetic conductive plate 5 to avoid hitting the magnetic conductive plate 5 during movement.

[0037] Furthermore, displacement acceleration sensors 9 are installed inside the inner sleeve 2 and the outer sleeve 1. Because the inner sleeve 2 and the outer sleeve 1 are not necessarily both stationary, the two displacement acceleration sensors 9 are used to measure the relative data of the movement of the inner sleeve 2 and the outer sleeve 1. According to the monitoring data of the displacement acceleration sensor 9, the enameled coil 8 can be energized to provide a magnetic field for the magnetorheological elastomer.

[0038] Furthermore, at least two groups of laminated MREs are arranged in the length direction of the first sleeve 11 (two groups are used as an example for specific description in the figure of this embodiment), and each group of laminated MREs includes a plurality of laminated MRE units arranged at intervals in the circumferential direction ( Figure 4 Taking a group of 6 laminated MRE units as an example for explanation), each group of laminated MRE units is provided with magnetic conductive plates 5 and coils on both sides.

[0039] Furthermore, the head of the second sleeve 12 is closed. The displacement acceleration sensor 9 is installed in the second sleeve 12 in a closed manner.

[0040] Furthermore, a gap is provided between the enameled coil 8 and the corresponding laminated MRE unit. The laminated MRE unit generates heat after heating, thereby changing its volume. By providing a gap between the enameled coil 8 and the corresponding laminated MRE unit, a certain space is reserved between the enameled coil 8 and the laminated MRE unit, providing a certain space for MRE deformation.

[0041] The working principle of the intelligent damper based on laminated MRE is as follows: when the inner sleeve 2 and the outer sleeve 1 move relative to each other due to vibration, the laminated MRE unit is driven to perform shear motion, and the enameled coil 8 adjusts the input current according to the actual data detected by the displacement acceleration sensor 9 to change the stiffness and damping of the laminated MRE unit, thereby dissipating the energy and avoiding resonance. Figure 6 As shown, after the excitation coil is energized, the magnetic flux lines sequentially pass through the laminated MRE, the first sleeve 11, the magnetic conductive plate 5, the third sleeve 13 and finally return to the laminated MRE unit to form a magnetic circuit. Since each laminated MRE unit corresponds to a coil, a closed magnetic circuit can be formed.

[0042] This intelligent damper can be installed at any position in the vibration reduction structure. The installation position can be reasonably selected according to the main vibration mode of the structure to maximize its energy dissipation and vibration reduction effect. A displacement acceleration sensor 9 and the like are installed inside the damper cavity. When the structure is subjected to external force, the relative movement of the outer sleeve 1 and the inner sleeve 2 drives the shear deformation of the magnetorheological elastomer layer. The reciprocating shear deformation of the magnetorheological elastomer can dissipate a large amount of energy, thereby achieving the purpose of vibration reduction. According to the acceleration obtained by the displacement acceleration sensor 9, the absolute speed is obtained through the Kalman filter, so that the magnitude of the magnetic field can be changed by changing the current of the input excitation coil using semi-active control, thereby changing the damping and stiffness of the magnetorheological elastomer layer to avoid resonance with earthquakes or wind fields. Because the magnetorheological elastomer itself is also a high-damping rubber, the new damper has a good vibration reduction effect when it is not powered on.

[0043] The device can not only be used for shock absorption in building structures, but also can be used for shock absorption in vehicles, aircraft, satellites and precision instruments by changing the size of the device.

[0044] The intelligent damper based on laminated MRE proposed in this embodiment is different from the solution in the prior art that the coil is wound around the middle column (the prior art first generates a magnetic field in the column, and when it is transmitted to the MRE, there will be energy loss on the way. There will be losses in the loop, and the farther away from the center of the coil, the greater the loss. Only the magnetic field in the center of the coil is the largest). By directly wrapping the coil around the MRE, a magnetic field is directly generated inside the MRE. The magnetic field is much higher than the magnetic field in the prior art, which can improve the MRE effect. Under the same MRE effect, the current required to be passed can be reduced, thereby reducing heat generation, making it safer and more suitable for continuous power-on operation. In addition, a plurality of laminated MRE units are arranged at intervals in the circumferential direction of the first annular chamber and the second annular chamber. Compared with the solution of a full circle of laminated MRE in the prior art, it is not a radial magnetic flux line, which can increase the magnetic induction intensity and thus improve the shock absorption effect.

[0045] The utility model further provides a shock-absorbing base.

[0046] A shock-absorbing base in the present preferred embodiment includes the above-mentioned intelligent damper based on laminated MRE, wherein the specific structure and beneficial effects of the intelligent damper refer to the above-mentioned embodiment and are not described in detail here.

[0047] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An intelligent damper based on laminated MRE, characterized in that: It comprises an outer sleeve and an inner sleeve which are relatively movable, wherein: The outer sleeve includes a first sleeve and a second sleeve located inside the first sleeve, and the inner sleeve includes a third sleeve. The end of the third sleeve is inserted into the first sleeve and the second sleeve to form an annular cavity. The head of the second sleeve is connected to the bottom wall of the third sleeve by an elastic member. A first annular chamber is formed between the first sleeve and the third sleeve, and a second annular chamber is formed between the third sleeve and the second sleeve. A plurality of stacked MRE units are arranged at intervals in the circumferential direction of the first annular chamber and the second annular chamber, and an enameled coil is correspondingly sleeved on the outside of each stacked MRE unit, and the enameled coil is located inside the annular cavity.

2. The intelligent damper based on laminated MRE according to claim 1, characterized in that: Magnetic conductive plates are fixed on the inner wall of the first sleeve and the outer wall of the second sleeve, and an enameled coil is wound around the inner side of the magnetic conductive plates. The first sleeve, the second sleeve, the second sleeve and the magnetic conductive plates are all made of magnetic conductive steel, and magnetic conductive plates are arranged on both sides of each laminated MRE unit.

3. The intelligent damper based on laminated MRE according to claim 1, characterized in that: The third sleeve is inserted into the head of the first sleeve to fix the rolling assembly, which includes a first end plate and a sliding ball mounted on the first end plate. The sliding ball is rollingly connected to the side walls of the first sleeve and the second sleeve, and the sliding ball is made of non-magnetic steel.

4. The intelligent damper based on laminated MRE as claimed in claim 3, characterized in that: A rolling assembly is also installed on the middle portion of the third sleeve inserted into the interior of the first sleeve.

5. The intelligent damper based on laminated MRE as claimed in claim 4, characterized in that: A buffer pad is also fixed on the side of the first end plate facing the magnetic guide plate.

6. The intelligent damper based on laminated MRE according to claim 1, characterized in that: Displacement acceleration sensors are installed inside the inner sleeve and the outer sleeve.

7. The intelligent damper based on laminated MRE as claimed in claim 1, characterized in that: At least two groups of laminated MREs are arranged in the length direction of the first sleeve, each group of laminated MREs includes a plurality of laminated MRE units arranged at intervals in the circumferential direction, and magnetic conductive plates and coils are arranged on both sides of each group of laminated MREs.

8. The intelligent damper based on laminated MRE as claimed in claim 1, characterized in that: The head of the second sleeve is closed.

9. The smart damper based on laminated MRE according to any one of claims 1 to 8, characterized in that: A gap is provided between the enameled coil and the corresponding laminated MRE unit.

10. A shock-absorbing base, characterized in that: The invention comprises a smart damper based on laminated MRE as claimed in any one of claims 1 to 9.

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