Embedded type multi-working-channel high-energy-consumption MR-STF damper and working method

Abstract

The invention discloses an embedded multi-working-channel high-energy-consumption MR-STF damper and a working method, and relates to the field of dampers, the embedded multi-working-channel high-energy-consumption MR-STF damper comprises a main piston rod, a cylinder wall, a main cylinder barrel, an auxiliary cylinder barrel and an auxiliary piston rod; a main cylinder barrel is arranged in the cylinder wall, an auxiliary cylinder barrel is arranged in the main cylinder barrel, the two ends of the main cylinder barrel are positioned and sealed through a left cylinder cover and a right cylinder cover, and the left cylinder cover and the right cylinder cover are detachably connected to the two ends of the cylinder wall. One end of the auxiliary cylinder barrel is arranged on the main piston I, and the other end of the auxiliary cylinder barrel is arranged on the main piston II; the main piston I is installed on the main piston rod, the auxiliary piston is installed on the auxiliary piston rod, and the auxiliary piston is arranged between the main piston I and the main piston II. Through the embedded structure of the main piston rod, the auxiliary piston rod and the auxiliary cylinder barrel, when the main piston rod is pushed, the auxiliary piston achieves the effect of relative movement relative to the auxiliary cylinder barrel, the auxiliary piston and the main piston can work together in a cooperative mode, and the effect of double damping and energy dissipation is achieved.

Description

Technical Field

[0001] The invention relates to the field of dampers, and in particular to an embedded multi-working channel high-energy consumption MR-STF damper and a working method. Background Art

[0002] Energy dissipation and shock absorption is a typical design concept of "using softness to overcome hardness" and is a hot and cutting-edge research direction in earthquake disaster reduction engineering. Traditional shock absorption technology mainly relies on the damping performance of damping materials, which is not very adaptable. Its shock absorption effect obviously depends on the spectral characteristics of the input excitation and the dynamic characteristics of the structure. It is not easy to control the displacement response and acceleration response of the structure at the same time.

[0003] With the deepening of research, intelligent composite materials have been successfully applied to structural shock absorption devices, which have the characteristics of large output, low energy consumption and rapid response. Magnetorheological material is a kind of intelligent material with instantaneous and reversible characteristics under the action of magnetic field. Shear thickening material is a new functional material whose system viscosity increases by 2-3 orders of magnitude with the increase of shear rate or shear stress. However, magnetorheological dampers also have certain application limitations. Single damping vibration reduction will not be able to slow down the deformation of strong impact load regulation. In addition, it is an active device. When the circuit fails and the magnetic field is lost, the control purpose cannot be achieved and the value is lost; the characteristic of shear thickening material is that it can passively respond to external load excitation. Under this support, the shock absorption mechanism can be adaptive, but its directional control goal has not been achieved; and magnetorheological material can promote the realization of control purpose under the action of external magnetic field. Based on the respective advantages of magnetorheological fluid and shear thickening fluid, the two are unified into one, which is a multifunctional shear thickening material with both shear hardening and magnetorheological coupling effects, which effectively fills the needs of impact resistance and vibration reduction. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an embedded multi-working channel high-energy consumption MR-STF damper. Through the embedded structure of the main and auxiliary piston rods and the auxiliary cylinder, when the main piston rod is pushed, the auxiliary piston achieves a relative movement effect relative to the auxiliary cylinder, and the auxiliary piston can work together with the main piston to achieve the effect of double shock absorption and energy consumption.

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A nested multi-working channel high-energy consumption MR-STF damper, comprising a main piston rod, a cylinder wall, a main cylinder barrel, a secondary cylinder barrel and a secondary piston rod; a main cylinder barrel is arranged in the cylinder wall, and a secondary cylinder barrel is arranged in the main cylinder barrel, wherein both ends of the main cylinder barrel are positioned and sealed by a left cylinder cover and a right cylinder cover, and the left cylinder cover and the right cylinder cover are detachably connected to the two ends of the cylinder wall; one end of the secondary cylinder barrel is arranged on the main piston I, and the other end is arranged on the main piston II; the main piston I is installed on the main piston rod, and a secondary piston is installed on the secondary piston rod, and the secondary piston is placed between the main piston I and the main piston II.

[0007] Preferably, a partition is provided in the main cylinder, and the partition divides the main cylinder into a MR-STF chamber and a gas compensation chamber, wherein the MR-STF chamber is filled with magnetorheological shear thickening fluid.

[0008] Preferably, the gas filled in the gas compensation chamber is nitrogen.

[0009] Preferably, the auxiliary cylinder is filled with magnetorheological shear thickening fluid.

[0010] Preferably, the main piston I, the main piston II and the auxiliary piston are all wound with excitation coils.

[0011] Preferably, the two excitation coils on the main piston II are separated by a magnetic isolation copper sheet.

[0012] Preferably, the main piston rod extends out of the left cylinder head and is connected to the left lifting ear; the auxiliary piston rod is fixedly connected to the right cylinder head.

[0013] Preferably, the right cylinder head is connected to the right lifting ear.

[0014] Preferably, the left cylinder head and the right cylinder head are connected to both ends of the cylinder wall by connecting bolts.

[0015] The working method of the embedded multi-working channel high energy consumption MR-STF damper comprises the following steps:

[0016] Under the excitation of the external environment, when the damper is subjected to the external seismic load, the main piston I in the damper drives the secondary cylinder to push to the right, and the magnetorheological shear thickening fluid in the main cylinder and the secondary cylinder starts to work. When the main piston I and the secondary piston collide, they begin to push in the opposite direction to the left. During this process, the gas compensation chamber will also provide compensation stiffness. One end of the secondary piston rod is fixed to the right cylinder head. Due to the back and forth push of the main piston rod, the secondary piston has relative movement relative to the secondary cylinder, so that the excitation coil on the secondary piston is also working. Together with the main piston I and the main piston II, the damper can apply controllable damping force in real time to consume energy according to the external seismic excitation environment and vibration control needs, thereby adapting to the environment of different excitation frequencies and having a buffering energy dissipation effect for different seismic load impacts.

[0017] Beneficial effects:

[0018] 1. The present invention sets two main pistons and one sub-piston as an interlocking structure. The sub-piston connected to the end of the sub-piston rod extends into the sub-cylinder and forms an interlocking form with the main piston. When the main piston pushes the MR-STF to dissipate energy, the sub-piston generates relative motion MR-STF to dissipate energy. The two can work together to achieve a greater damping force than the traditional single-rod damper, effectively cope with the impact of seismic loads, and realize double shock absorption and energy dissipation.

[0019] 2. In the present invention, four fluid channels are arranged between the main piston and the auxiliary piston, and excitation coils are arranged on both the main and auxiliary pistons. When the main piston pushes the MR-STF to work, the four working channels work together at the same time to generate a greater Coulomb force, which achieves a better high-energy-consuming effect of shock absorption and buffering compared to a single-working-channel damper.

[0020] 3. The present invention achieves cooperative work between the main piston and the sub-piston, and different impact velocities are generated for input excitation frequencies of different seismic loads. Correspondingly, when the main piston is pushed, it will have different movement speeds relative to the sub-piston. Even if the damping force is adjustable under constant current, the damper can apply controllable damping force in real time to dissipate energy and reduce vibration according to the external seismic excitation environment and vibration control needs, thereby adapting to environments with different excitation frequencies.

[0021] 4. The present invention can realize the main piston pushing the MR-STF to consume energy without adding an additional cylinder, and the auxiliary piston also pushes the MR-STF to consume energy due to relative displacement. Compared with the traditional single-rod damper, the output is greater, the space utilization rate of the cylinder is effectively improved, and the space occupied by the damper is saved, so that the damper does not occupy too much space when installed in the building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the embedded multi-working channel high energy consumption MR-STF damper involved in the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the connection structure of the main piston rod, main piston I, main piston II and auxiliary cylinder involved in;

[0024] Figure 3 for Figure 1 Schematic diagram of the connection structure between the auxiliary piston rod and the auxiliary piston involved;

[0025] Figure 4 It is a cross-sectional schematic diagram of an embedded multi-working channel high energy dissipation MR-STF damper;

[0026] Figure 5It is a schematic diagram of the working phase of the embedded multi-working channel high energy dissipation MR-STF damper;

[0027] Figure 6 for Figure 1 Schematic diagram of magnetic circuit of main piston I and main piston II involved in;

[0028] Figure 7 for Figure 1 Schematic diagram of the magnetic circuit of the secondary piston involved;

[0029] Figure 8 This is a schematic diagram of the magnetic force line distribution of the main piston II by finite element simulation;

[0030] Fig. 9 This is the magnetic induction intensity diagram of the main piston II finite element simulation;

[0031] Fig.10 Finite element simulation of magnetic induction intensity distribution curve of main piston II Figure 1 ;

[0032] Fig.11 Finite element simulation of magnetic induction intensity distribution curve of main piston II Figure 2 ;

[0033] Fig.12 This is a schematic diagram of the magnetic force line distribution of the auxiliary piston finite element simulation;

[0034] Fig.13 This is the magnetic induction intensity diagram of the auxiliary piston finite element simulation;

[0035] Fig.14 This is the induction intensity curve diagram of the auxiliary piston finite element simulation;

[0036] Fig.15 This is a physical picture of the embedded multi-working channel high-energy dissipation MR-STF damper.

[0037] Reference numerals:

[0038] 1-left lifting ear; 2-main piston rod; 3-connecting bolt; 4-left cylinder head; 5-excitation coil; 6-main piston I; 7-cylinder wall; 8-main cylinder barrel; 9-auxiliary cylinder barrel; 10-main piston II; 11-MR-STF chamber; 12-auxiliary piston rod; 13-auxiliary piston; 14-magnetic isolation copper sheet; 15-partition; 16-gas compensation chamber; 17-right cylinder head; 18-right lifting ear. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Combined with Figure 1-4As shown, an embedded multi-working channel high energy consumption MR-STF damper includes a left lifting ear 1, a main piston rod 2, a connecting bolt 3, a left cylinder head 4, an excitation coil 5, a main piston I 6, a cylinder wall 7, a main cylinder barrel 8, a secondary cylinder barrel 9, a main piston II 10, an MR-STF chamber 11, a secondary piston rod 12, a secondary piston 13, a magnetic isolation copper sheet 14, a partition 15, a gas compensation chamber 16, a right cylinder head 17 and a right lifting ear 18; the main piston rod I 2, the secondary cylinder barrel 9 and the secondary piston rod 12 are an embedded structure, one end of the main piston rod I 2 extends out of the left cylinder head 4 and is embedded and screwed into the left lifting ear 1, and the other end is connected to the main piston I 6 connection; the auxiliary piston rod 12 is in the MR-STF chamber 11 and one end is fixed on the right cylinder head, and the other end is connected to the auxiliary piston 13 and is embedded and not connected to the MR-STF chamber 11 which extends into the auxiliary cylinder 9 and is placed therein; the main cylinder 8 is sealedly connected to the left cylinder head 4 and the right cylinder head 17; the three pistons are all wound with an excitation coil 5; the main piston I 2 is connected to the auxiliary cylinder 9 and is placed in the MR-STF chamber 11; the auxiliary cylinder 9 is connected to the main piston II 10 and is placed in the MR-STF chamber 11, and the main piston II The two excitation coils 5 of 10 are separated by a magnetic isolation copper sheet 14; the auxiliary piston rod 12 is connected to the auxiliary piston 13 and is placed in the MR-STF chamber 11; the gas compensation chamber 16 is filled with nitrogen and is placed in the main cylinder 8, and is sealed with a partition 15 and placed on the inner side of the right cylinder head 17; the MR-STF chamber 11 is filled with magnetorheological shear thickening fluid; the outer side of the right cylinder head 17 is connected to the right lifting ear 18; the outer side of the main cylinder 8 is sealed and connected to the cylinder wall 7; the cylinder wall 7 is connected to the left cylinder head 4 and the right cylinder head 17 by bolts 3.

[0043] In the present invention, four fluid channels are arranged between the main piston I 6, the main piston II 10 and the auxiliary piston 13, and the four fluid channels are between the main piston I 6 and the main cylinder 8, between the main piston II 10 and the main cylinder 8, between the main piston II 10 and the auxiliary piston rod 12, and between the auxiliary piston 13 and the auxiliary cylinder 9; the arrangement of four fluid channels can better achieve the effect of shock absorption, high energy consumption and high output. When the main piston I 6 is pushed to the right, the fluid flows from the auxiliary cylinder 9 to the auxiliary piston 13 and the auxiliary cylinder, and then flows to the main piston II 10 and the auxiliary piston rod 12 to enter the main cylinder 8, and the fluid in the main cylinder 8 flows to the main piston II10 and the main cylinder 8 in turn, and then flows to the main piston I 6 and the main cylinder 8 to enter the MR-STF chamber 11 between the main piston I 6 and the left cylinder head 4. When the main piston I 6 is pushed to the left, the process is opposite, so the setting and structure of the four fluid channels also improve the cylinder utilization rate; the excitation coil 5 is set on the main piston I 6, the main piston II 10 and the auxiliary piston 13. When the main piston pushes the MR-STF to work, the Coulomb force generated by the four working channels working together at the same time is greater, compared with the single working channel damper, a better high-energy consumption effect of shock absorption and buffering is achieved.

[0044] Working process:

[0045] Combined with Figure 5 As shown, under the excitation of the external environment, when the damper is subjected to the external seismic load, the main piston I6 in the damper drives the auxiliary cylinder 9 to push to the right, and the magnetorheological shear thickening fluid in the main cylinder 8 and the auxiliary cylinder 9 starts to work. When the main piston I6 and the auxiliary piston 13 collide, they start to push back to the left. During this process, the gas compensation chamber 16 will also provide compensation stiffness. One end of the auxiliary piston rod 12 is fixed to the right cylinder cover 17. Due to the back and forth push of the main piston rod 2, the auxiliary piston 13 has relative movement relative to the auxiliary cylinder 9, so that the excitation coil 5 on the auxiliary piston 13 is also working. The main piston I6 and the main piston II10 work together, so that the damper can apply controllable damping force in real time to consume energy according to the external seismic excitation environment and vibration control needs, thereby adapting to the environment of different excitation frequencies and having a better buffering and energy dissipation effect for different seismic load impacts.

[0046] Combined with Figure 6-7 As shown, when current is passed through the coils, a rough distribution diagram of the magnetic field generated around the coils of the primary piston I and the primary piston II, as well as a rough distribution diagram of the magnetic field generated around the coil of the secondary piston.

[0047] Combined with Figure 8-14 As shown in FIG. 1 , the finite element simulation results of the magnetic circuit of the main piston II and the auxiliary piston are shown in FIG. 1 . The magnetic circuit simulation is performed using the electronics desktop module in the software Ansys. Figure 8 , 12 The distribution of magnetic lines of force around the main piston II and the auxiliary piston can be seen intuitively. Fig. 9 , 10 , 11 It can be seen that the magnetic induction intensity at the damping gap of the main piston II is relatively large, which is 1.2T; Fig.13 , 14 It can be seen that the magnetic induction intensity at the damping gap of the secondary piston is relatively large, which is 1.12T.

[0048] Combined with Fig.15 As shown, this is a physical picture of the processed embedded multi-working channel high-energy dissipation MR-STF damper.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. An embedded multi-working channel high energy dissipation MR-STF damper, characterized in that: The invention comprises a main piston rod (2), a cylinder wall (7), a main cylinder barrel (8), a secondary cylinder barrel (9) and a secondary piston rod (12); the main cylinder barrel (8) is arranged in the cylinder wall (7), and the secondary cylinder barrel (9) is arranged in the main cylinder barrel (8), wherein the two ends of the main cylinder barrel (8) are positioned and sealed by a left cylinder cover (4) and a right cylinder cover (17), and the left cylinder cover (4) and the right cylinder cover (17) are detachably connected to the two ends of the cylinder wall (7); one end of the secondary cylinder barrel (9) is arranged on the main piston I (6), and the other end is arranged on the main piston II (10); the main piston I (6) is installed on the main piston rod (2), and the secondary piston (13) is installed on the secondary piston rod (12), and the secondary piston (13) is placed between the main piston I (6) and the main piston II (10).

2. The embedded multi-working channel high energy consumption MR-STF damper according to claim 1 is characterized in that: A partition (15) is arranged in the main cylinder (8), and the partition (15) divides the main cylinder (8) into an MR-STF chamber (11) and a gas compensation chamber (16), wherein the MR-STF chamber (11) is filled with magnetorheological shear thickening fluid.

3. The embedded multi-working channel high energy consumption MR-STF damper according to claim 2 is characterized in that: The gas filled in the gas compensation chamber (16) is nitrogen.

4. The embedded multi-working channel high energy consumption MR-STF damper according to claim 2 is characterized in that: The auxiliary cylinder (9) is filled with magnetorheological shear thickening fluid.

5. The embedded multi-working channel high energy consumption MR-STF damper according to claim 1 is characterized in that: The main piston I (6), the main piston II (10) and the auxiliary piston (13) are all wound with an excitation coil (5).

6. The embedded multi-working channel high energy consumption MR-STF damper according to claim 5 is characterized in that: The two excitation coils (5) on the main piston II (10) are separated by a magnetic isolation copper sheet (14).

7. The embedded multi-working channel high energy consumption MR-STF damper according to claim 1 is characterized in that: The main piston rod (2) extends out of the left cylinder cover (4) and is connected to the left lifting ear (1); the auxiliary piston rod (12) is fixedly connected to the right cylinder cover (17).

8. The embedded multi-working channel high energy dissipation MR-STF damper according to claim 1 is characterized in that: The right cylinder head (17) is connected to the right lifting ear (18).

9. The embedded multi-working channel high energy consumption MR-STF damper according to claim 1 is characterized in that: The left cylinder cover (4) and the right cylinder cover (17) are connected to the two ends of the cylinder wall (7) via connecting bolts (3).

10. The working method of the embedded multi-working channel high energy consumption MR-STF damper according to any one of claims 1 to 9, characterized in that: The steps include: Under the excitation of the external environment, when the damper is subjected to the external seismic load, the main piston I (6) in the damper drives the auxiliary cylinder (9) to push rightward, and the magnetorheological shear thickening fluid in the main cylinder (8) and the auxiliary cylinder (9) starts to work. When the main piston I (6) and the auxiliary piston (13) collide, they start to push back to the left. During this process, the gas compensation chamber (16) also provides compensation stiffness. One end of the auxiliary piston rod (12) is fixed to the right cylinder cover (17). Due to the back and forth push of the main piston rod (2), the auxiliary piston (13) has relative movement relative to the auxiliary cylinder (9), so that the excitation coil (5) on the auxiliary piston (13) is also working. In cooperation with the main piston I (6) and the main piston II (10), the damper can apply controllable damping force in real time to dissipate energy according to the external seismic excitation environment and vibration control needs, thereby adapting to environments with different excitation frequencies and having a buffering and energy dissipation effect for different seismic load impacts.

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