Self-resetting SMA-tuned inertial mass damper and method of assembly

Abstract

The application discloses a self-resetting SMA tuning inertial mass damper and an assembling method, relates to the technical field of building structure damping control, and comprises an eddy current damping generation device, a transmission device and a self-resetting device; the self-resetting device comprises a second fixed disc and a third fixed disc, center holes are arranged at the centers of the second fixed disc and the third fixed disc, the third fixed disc is arranged on the left side of the second fixed disc, and the two ends of the third fixed disc and the second fixed disc are fixed to the inner wall of an outer cylinder; a guide cylinder is arranged on the right side of the second circular baffle, an elastic device is arranged between the left side of the second circular baffle and the left side inner wall of the outer cylinder; a second spring is arranged on a ball screw between the first circular baffle and the first fixed disc; a plurality of memory alloy rods are arranged between the second fixed disc and the third fixed disc; and the application can realize the reduction or even elimination of the residual deformation of a building after an earthquake and reduce the post-earthquake repair cost of the structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building structure shock absorption control, and relates to a self-resetting SMA tuned inertial mass damper and an assembling method. BACKGROUND

[0002] The anti-collapse design of the current specification makes building structures face the risk of being demolished under strong earthquake action, and the highly developed economy of modern society requires that urban infrastructure can realize post-earthquake function recovery. The application of energy dissipation devices with self-resetting mechanism and energy dissipation mechanism to building structures can improve the seismic performance of the structures and realize efficient post-earthquake function recovery. Such buildings have low post-earthquake repair costs and are convenient for maintaining the use function after an earthquake.

[0003] Tuned inertial mass dampers are widely researched and applied due to their light weight, small size, fast response speed and wide frequency adjustment range. The tuned inertial mass damper changes the single mode of single-end connection of the traditional tuned mass damper, can more flexibly and effectively achieve the purpose of changing the inertia and tuning of the structure, the inertance coefficient generated by the device is much larger than the physical mass of the device itself, the adjustment of the inertia characteristics can be realized without changing the physical mass of the structure, and the increased inertia of the inertance does not increase the seismic action on the structure. However, the tuned inertial mass damper still has the shortcomings of weak energy dissipation capacity and no self-resetting capacity. In order to improve the energy dissipation capacity of the damper, relevant scholars introduce an electromagnetic induction system and develop an eddy current tuned damper, but the problem of self-resetting capacity has not been solved. Intelligent material shape memory alloy (SMA) has excellent shape memory effect and superelasticity effect, and can realize the dual advantages of energy dissipation and self-resetting at room temperature. The damper developed by using SMA can maintain good reliability, corrosion resistance and fatigue resistance in large deformation, and the combination of SMA and the tuned inertial mass damper can improve the robustness of the damper and realize the triple advantages of tuning, energy dissipation and self-resetting.

[0004] Therefore, the self-resetting SMA tuned inertial mass damper and the assembling method are proposed, which has important economic value and social significance for the development of post-earthquake function recovery seismic structures. SUMMARY

[0005] The purpose of the present application is to provide a self-resetting SMA tuned inertial mass damper and an assembling method to overcome the shortcomings of the prior art that the existing tuned inertial mass damper has insufficient energy dissipation and cannot self-reset.

[0006] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0007] In a first aspect, the present application provides a self-resetting SMA tuned inertial mass damper, comprising an eddy current damping generation device, a transmission device and a self-resetting device.

[0008] The eddy current damping generation device comprises an outer cylinder, the self-resetting device is arranged at the left side inside the outer cylinder, the self-resetting device comprises a second fixed disc and a third fixed disc, the second fixed disc and the third fixed disc are both provided with a center hole at the center thereof, the transmission device can pass through the center hole, the third fixed disc is arranged at the left side of the second fixed disc, and the two ends of the third fixed disc and the second fixed disc are both fixed to the inner wall of the outer cylinder.

[0009] The right side of the second fixed disc is provided with a first circular baffle, the left side of the third fixed disc is provided with a second circular baffle, the right side of the second circular baffle is provided with a guide cylinder, the transmission device passes through the eddy current damping generation device and is fixed to the guide cylinder, and the left side of the second circular baffle and the left side inner wall of the outer cylinder are provided with an elastic device; the transmission device between the first circular baffle and the first fixed disc is sleeved with a second spring; a plurality of memory alloy rods are arranged between the second fixed disc and the third fixed disc.

[0010] Further, the eddy current damping generation device further comprises a first fixed disc, the first fixed disc is arranged at the right side inside the outer cylinder and is located at the right side of the second fixed disc, the two ends of the first fixed disc are both fixed to the inner wall of the outer cylinder, and the center of the first fixed disc is provided with a center hole.

[0011] An inner cylinder is arranged between the right side inner wall of the outer cylinder and the first fixed disc, the two sides of the inner cylinder are open, the two outer side walls of the inner cylinder are both connected with a conductor, the upper inner wall and the lower inner wall of the outer cylinder at the position corresponding to the conductor are both provided with a magnet, and a gap is left between the conductor and the magnet.

[0012] Further, the transmission device comprises a ball screw pair, the ball screw pair comprises a ball screw and a ball screw nut, the ball screw passes through the inner cylinder from the right side of the outer cylinder and is connected to the guide cylinder, the inner side of the inner cylinder is connected with the ball screw nut, and a gap is left between the inner cylinder opening and the ball screw.

[0013] Further, the elastic device comprises a spring fixing shaft, the spring fixing shaft is arranged at the outer side of the second circular baffle, a spring fixing cylinder is arranged between the spring fixing shaft and the left side inner wall of the outer cylinder, a first spring is arranged on the spring fixing shaft, and the first spring is arranged in the spring fixing cylinder.

[0014] Further, a push-pull buckle is placed in the center hole of the second fixed disc, the push-pull buckle is fixedly connected with the ball screw, and a gap is left between the push-pull buckle and the second fixed disc.

[0015] Further, the memory alloy rods are arranged in parallel to the ball screw, and at least four memory alloy rods in parallel to the ball screw are arranged between the second fixing disc and the third fixing disc, and the memory alloy rods are arranged between the second fixing disc and the third fixing disc through the fixing nut.

[0016] Further, the inner cylinder is connected with the right inner wall of the outer cylinder through the right rotating bearing, and the inner cylinder is connected with the first fixing disc through the left rotating bearing.

[0017] Further, the magnet is a permanent magnet.

[0018] Further, the outer cylinder is provided with the mounting hole on the outer side of both ends.

[0019] In another aspect, the application further provides an assembling method of the self-resetting SMA tuned inertial mass damper, comprising the following steps:

[0020] S1, the conductor is fixed on the two outer side walls of the inner cylinder, and the inner cylinder is fixed on the ball screw nut;

[0021] S2, the guide cylinder and the spring fixing shaft are respectively fixed on the two sides of the second circular baffle, the left ends of the plurality of memory alloy rods pass through the center hole of the third fixing disc and pass through the second circular baffle and are fixed through the fixing nut, the right ends of the plurality of memory alloy rods pass through the center hole of the second fixing disc, the ball screw is embedded into the guide cylinder through the center hole of the second fixing disc, and the push-pull buckle is fixed at the center hole of the second fixing disc, then the first circular baffle is sleeved on the right end of the memory alloy rod through the ball screw and is fixed through the fixing nut;

[0022] S3, the second spring, the first fixing disc, the left rotating bearing, the inner cylinder with the fixed ball screw nut and the right rotating bearing are sequentially sleeved on the right end of the ball screw;

[0023] S4, the first spring is arranged on the spring fixing shaft, the spring fixing cylinder is fixed on the left side wall of the outer cylinder, the first spring is arranged in the spring fixing cylinder, the spring fixing shaft is in contact with the spring fixing cylinder, the magnet is fixed on the inner wall of the outer cylinder and the lower inner wall of the outer cylinder at the position corresponding to the conductor, and a gap is left between the conductor and the magnet;

[0024] S5, the outer cylinder is segmented and welded into an integral whole through the first fixing disc, the second fixing disc and the third fixing disc.

[0025] Compared with the prior art, the application has the following beneficial technical effects:

[0026] The self-resetting SMA tuned inertia damper provided by the application dissipates a large amount of energy generated by earthquakes through the eddy current damping generation device and the self-resetting device, reduces the energy dissipation and absorption of the force-bearing member of the building structure in the earthquake, and thus achieves the effect of protecting the building structure; and the self-resetting device can reset the damper to the initial state after the earthquake, so as to reduce or even eliminate the residual deformation of the building and reduce the post-earthquake repair cost of the structure.

[0027] Specifically, the application can also increase the damping coefficient of the damper, change the size of the eddy current damping, and thus adapt to different application scenarios and different requirements for damping force by increasing the diameter of the inner cylinder, increasing the magnetic field strength of the magnet, and increasing the number of magnets.

[0028] Specifically, the ball screw amplitude transmission adopted by the application is a standard mechanical transmission mode, and the self-resetting energy dissipation device is assembled, so that the standard mass production is easy to realize, the connection with the building structure is convenient, and the practicability is high. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a transverse sectional view schematic diagram of a self-resetting SMA tuned inertia damper in the embodiment of the application.

[0030] Figure 2 It is a whole structure schematic diagram of a self-resetting SMA tuned inertia damper in the embodiment of the application.

[0031] Figure 3 It is a longitudinal sectional view schematic diagram of a self-resetting device of a self-resetting SMA tuned inertia damper in the embodiment of the application.

[0032] Figure 4 It is a longitudinal sectional view schematic diagram of an eddy current damping generation device of a self-resetting SMA tuned inertia damper in the embodiment of the application.

[0033] In the figure, 1 is a ball screw, 2 is an outer cylinder, 3 is a ball screw nut, 4 is an inner cylinder, 5 is a conductor, 6 is a right rotating bearing, 7 is a left rotating bearing, 8 is a first fixed disc, 9 is a second fixed disc, 10 is a third fixed disc, 11 is a second spring, 12 is a first spring, 13 is a first circular baffle, 14 is a second circular baffle, 15 is a fixed nut, 16 is a push-pull buckle, 17 is a memory alloy rod, 18 is a guide cylinder, 19 is a spring fixing shaft, 20 is a spring fixing cylinder, 21 is a mounting hole, and 22 is a magnet. DETAILED DESCRIPTION

[0034] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0036] Embodiment 1

[0037] Reference Figures 1 to 4 A self-resetting SMA tuned inertial mass damper, comprising an eddy current damping generation device, a transmission device and a self-resetting device;

[0038] The eddy current damping generation device comprises an outer cylinder 2, the self-resetting device is arranged inside the left side of the outer cylinder 2, the self-resetting device comprises a second fixed disc 9 and a third fixed disc 10, the second fixed disc 9 and the third fixed disc 10 are both provided with a center hole at the center to enable the transmission device to pass through, the third fixed disc 10 is arranged at the left side of the second fixed disc 9, and the two ends of the third fixed disc 10 and the second fixed disc 9 are both fixed on the inner wall of the outer cylinder 2;

[0039] The right side of the second fixed disc 9 is provided with a first circular baffle 13, the left side of the third fixed disc 10 is provided with a second circular baffle 14, the right side of the second circular baffle 14 is provided with a guide cylinder 18 and the transmission device is fixed through the eddy current damping generating device and the guide cylinder 18, and the left side of the second circular baffle 14 and the inner wall of the left side of the outer cylinder 2 are provided with elastic devices; the second spring 11 is sleeved on the ball screw 1 between the first circular baffle 13 and the first fixed disc 8; a plurality of memory alloy rods 17 are arranged between the second fixed disc 9 and the third fixed disc 10. When the ball screw 1 moves axially to the left, the second circular baffle 14 is pushed, the memory alloy rod 17 is pulled at the same time, and the elastic device is pressed, and when the ball screw 1 moves axially to the right, the first circular baffle 13 is pushed through the push-pull buckle 16 fixed on the ball screw 1, the memory alloy rod 17 is pulled at the same time, and the second spring 11 is pressed.

[0040] The damping force generated by the memory alloy rod 17 and the eddy current damping generating device can dissipate a large amount of energy, reduce the energy dissipation absorption of the force bearing member of the building structure in the earthquake, and effectively inhibit the vibration or slow down the movement speed.

[0041] In some preferred embodiments of the present application, the elastic device comprises a spring fixing shaft 19, the spring fixing shaft 19 is arranged on the outer side of the second circular baffle 14, a spring fixing cylinder 20 is arranged between the spring fixing shaft 19 and the inner wall of the left side of the outer cylinder 2, a first spring 12 is arranged on the spring fixing shaft 19, and the first spring 12 is arranged in the spring fixing cylinder 20.

[0042] In some preferred embodiments of the present application, the magnet 22 is a permanent magnet.

[0043] In some preferred embodiments of the present application, mounting holes 21 are arranged on the outer sides of both ends of the outer cylinder 2, and the mounting holes facilitate the connection of the damper with the building.

[0044] In some preferred embodiments of the present application, mounting holes 21 are arranged on the left side of the outer cylinder 2 and connected with the building, and one end of the ball screw 1 is directly hinged with the building.

[0045] Embodiment 2

[0046] On the basis of embodiment 1, the eddy current damping generating device further comprises a first fixed disc 8, the first fixed disc 8 is arranged on the right side in the inner part of the outer cylinder 2 and the first fixed disc 8 is located on the right side of the second fixed disc 9, the first fixed disc 8 is fixed on the inner wall of the outer cylinder 2 at both ends and the first fixed disc 8 is provided with a center hole in the center, and the center hole is convenient for the transmission device to pass through;

[0047] The inner cylinder 4 is provided between the right inner wall of the outer cylinder 2 and the first fixed disc 8, the inner cylinder 4 is a two-side opening cylinder, and the two outer side walls of the inner cylinder 4 are connected with the conductor 5, the inner wall of the outer cylinder 2 and the lower inner wall of the outer cylinder 2 at the position corresponding to the conductor 5 are provided with the magnet 22, and the conductor 5 and the magnet 22 are left with a gap; when vibration or movement occurs, the conductor 5 on the inner cylinder 4 moves relative to the magnet 22 on the outer cylinder 2, and the eddy current effect is formed in the conductor 5 to generate a damping force, the eddy current generates a force to hinder the relative movement, and the damping force can effectively convert mechanical energy into heat energy, inhibit vibration or slow down movement speed, so that energy dissipation is realized.

[0048] The inner cylinder 4 is connected with the right inner wall of the outer cylinder 2 through the right rotating bearing 6, and the inner cylinder 4 is connected with the first fixed disc 8 through the left rotating bearing 7.

[0049] In some preferred embodiments of the present application, the transmission device comprises a ball screw pair, the ball screw pair comprises a ball screw 1 and a ball screw nut 3, the ball screw 1 passes through the inner cylinder 4 from the right side of the outer cylinder 2 and is connected to the guide cylinder 18, the guide cylinder 18 provides additional guidance and support for the movement of the ball screw 1, the inner side of the inner cylinder 4 is connected with the ball screw nut 3, the rotational movement of the ball screw 1 is converted into the linear movement of the inner cylinder 4, and a gap is left between the opening of the inner cylinder 4 and the ball screw 1.

[0050] In some preferred embodiments of the present application, the push-pull buckle 16 is placed in the center hole of the second fixed disc 9, the push-pull buckle 16 is fixedly connected with the ball screw 1, and a gap is left between the push-pull buckle 16 and the second fixed disc 9; the center hole of the second fixed disc 9 plays a role of positioning and guiding the push-pull buckle 16 to a certain extent. It can limit the displacement of the push-pull buckle 16 in the direction perpendicular to the axial direction, so that the movement of the ball screw 1 is kept in the predetermined linear direction.

[0051] In some preferred embodiments of the present application, the push-pull buckle 16 is fixedly connected with the ball screw 1 by welding.

[0052] Energy consumption principle: through theoretical calculation and numerical simulation to obtain the additional damping required by the building, the electric eddy current damping generating device and the self-resetting device will generate additional damping. In the electric eddy current damping generating device, the inner cylinder 4 and the conductor 5 fixed on the ball screw nut 3 are relatively rotated with the magnet 22 fixed on the outer cylinder 2 through the ball screw amplitude. Since the magnetic induction lines of the magnet 22 fixed on the outer cylinder 2 are mostly perpendicular to the conductor 5 pipe, with the rotation of the ball screw nut 3, the conductor 5 pipe cuts the magnetic induction lines to generate electric eddy current. The electric eddy current generates heat while circulating, and at the same time forms a damping force that hinders the mutual movement of the two, so the electric eddy current device will generate a large damping coefficient. The electric eddy current will convert mechanical energy into heat energy during the generation process, thereby realizing energy dissipation. In the mechanical structure subjected to impact or vibration, it can prevent excessive accumulation of energy and cause damage to the structure.

[0053] Assuming that the equivalent damping coefficient at the single magnet 22 of the electric eddy current device is c 1, the equivalent axial damping coefficient c generated is

[0054] (1)

[0055] wherein, r is the outer diameter of the conductor 5 pipe; l is the lead of the ball screw 1; since r is much larger than l , the equivalent axial damping coefficient c can reach hundreds or even thousands of times of the equivalent damping coefficient at the single magnet 22 which is c 1. The equivalent damping coefficient of the electric eddy current damping device is the sum of the equivalent damping coefficients at the single magnet 22.

[0056] In addition to the above-mentioned damping force, there is also an axial inertia force generated by the apparent mass to hinder the axial movement of the damper. The apparent mass is converted from linear motion to high-speed rotary motion by the ball screw 1, and the linear motion of the screw and the rotary motion of the inner cylinder 4 are converted to produce a rotary inertia moment of the inner cylinder 4, and then converted to a large apparent mass through the ball screw pair. The lead of the ball screw 1 is l , and the rotary inertia of each part is I . Assuming that the apparent mass is m r

[0057] (2)

[0058] It can be seen that when the lead lWhen being very small, the apparent mass can be formed to be very large, and the axial inertia force hindering the axial movement of the damper is generated from the apparent mass, so that the damper has a large negative stiffness effect, the period of the structure is prolonged, the seismic safety of the structure is improved, and the seismic resistance of the structure is beneficial

[0059] In some preferred embodiments of the present application, the memory alloy rod 17 is arranged parallel to the ball screw 1, and at least four memory alloy rods 17 parallel to the ball screw 1 are arranged between the second fixed disc 9 and the third fixed disc 10, and the memory alloy rod 17 is arranged between the second fixed disc 9 and the third fixed disc 10 through the fixed nut 15. Six memory alloy rods 17 are used in the application of the present embodiment.

[0060] According to the required restoring force of the building structure, the output value of the damper is determined, the memory alloy rod and the spring are selected according to the expression of the damper output, and the memory alloy rod 17 is processed;

[0061] The expression of the damper output is:

[0062] F = f y A s + kx + cv + m r a (3);

[0063] Wherein, f y The maximum restoring stress of the memory alloy rod 17 is f y A s The maximum restoring force of the memory alloy rod 171 is k The stiffness of the spring is kx The restoring force of the spring is c The equivalent axial damping coefficient of the eddy current damping generating device is m r The apparent mass of the eddy current system is v The axial velocity of the damper ball screw is a The difference between the acceleration of the free end and the fixed end of the damper is

[0064] The processing of the memory alloy rod 17 is specifically,

[0065] Step one, calculate the length of the wire sleeve at both ends of the memory alloy rod according to formula (4):

[0066] (4);

[0067] Wherein, f uThe ultimate tensile strength of the memory alloy rod 17, A s The cross-sectional area of all memory alloy rods 17, σ t The allowable extrusion stress of the threaded memory alloy rod 17, d s The nominal diameter of the memory alloy rod 17, l t The minimum threading length;

[0068] Step two, select the threading pitch and threading depth according to the diameter of the base material;

[0069] Step three, select the nut corresponding to the threading pitch and threading depth of the size of the memory alloy rod, and the nut length is 20mm.

[0070] Example 3

[0071] The application also provides an assembly method of a self-resetting SMA tuned inertial mass damper, which specifically comprises the following steps:

[0072] S1, first, the conductor 5 is accurately fixed on the two outer walls of the inner cylinder 4. During the fixing process, it is ensured that the connection between the conductor 5 and the inner cylinder 4 is firm and stable, and appropriate fixing methods such as welding, bolt connection or special clamping device can be used to prevent the conductor 5 from loosening or displacing in the subsequent use process; after the fixing of the conductor 5 is completed, the inner cylinder 4 is accurately fixed on the ball screw nut 3;

[0073] S2, first, the guide cylinder 18 is firmly fixed on one side of the second circular baffle 14, and the spring fixing shaft 19 is also stably fixed on the other side of the second circular baffle 14. When installing multiple memory alloy rods 17, careful operation is required. The left end of each memory alloy rod 17 is sequentially inserted through the center hole of the third fixed disc 10, and then inserted through the second circular baffle 14, and then fixed by using the fixed nut 15, so as to ensure that the fixation of each memory alloy rod 17 at this position is reliable and will not loosen or shake. Then, the right end of the multiple memory alloy rods 17 is inserted through the center hole of the second fixed disc 9. Subsequently, the ball screw 1 is carefully inserted through the center hole of the second fixed disc 9 and accurately embedded in the guide cylinder 18, and the push-pull buckle 16 is firmly fixed at the center hole of the second fixed disc 9. After these operations are completed, the first circular baffle 13 is inserted through the ball screw 1 and sleeved on the right end of the memory alloy rod 17, and finally fixed by using the fixed nut 15, so as to ensure that the connection between the various components is tight and meets the design requirements;

[0074] S3, after the above steps are completed, the component installation is sequentially carried out at the right end of the ball screw 1, first, the second spring 11 is sleeved, the installation position of the spring is ensured to be accurate, and the elastic performance of the spring is not damaged, then the first fixed disc 8 is sleeved, the first fixed disc 8 is tightly matched with the ball screw 1, and stable support is provided for subsequent components. After that, the left rotating bearing 7 is installed, the installation of the bearing is ensured to be correct, the bearing can rotate smoothly, the friction and wear of the ball screw 1 in the rotating process are reduced, then the inner cylinder 4 with the ball screw nut 3 fixed is sleeved on the ball screw 1, so that the inner cylinder 4 can realize linear motion under the driving of the ball screw 1. Finally, the right rotating bearing 6 is installed, and the flexibility and stability of the entire transmission system during operation are further ensured.

[0075] S4, the first spring 12 is arranged on the spring fixing shaft 19, and the installation direction and initial state of the spring are paid attention to, at the same time, the spring fixing cylinder 20 is fixed on the left side wall of the outer cylinder 2, and the first spring 12 is arranged in the spring fixing cylinder 20, so that the spring fixing shaft 19 can be in close contact with the spring fixing cylinder 20, and the spring can effectively play its elastic role in the working process. In addition, the magnet 22 is accurately fixed on the inner wall of the outer cylinder 2 and the lower inner wall of the outer cylinder 2 corresponding to the conductor 5, and during the fixing process, attention should be paid to keeping a suitable gap between the conductor 5 and the magnet 22, so as to ensure the generation of the eddy current and the normal realization of the damping function.

[0076] S5, finally, the outer cylinder 2 is segmented welded through the first fixed disc 8, the second fixed disc 9 and the third fixed disc 10, and in the welding process, appropriate welding process and equipment are used to ensure the welding quality and avoid welding defects such as pores and cracks. Ensure that each welded part can firmly connect each component, so that the entire outer cylinder 2 forms a stable overall structure, and provides reliable protection and support for the internal components, thereby completing the assembly process of the entire device.

[0077] The working principle of the application is as follows:

[0078] When the controlled structure is subjected to transverse vibration, the eddy current damping generation device converts the axial movement of the controlled structure into the rotational movement of the internal structure of the damper through the ball screw pair, at the same time, the self-resetting device makes the memory alloy rod 17 always maintain a tension state through the axial movement of the ball screw 1, the first spring 12 and the second spring 11 can always maintain a compression state when the second fixed disc 9 and the third fixed disc 10 move transversely, and the eddy current damping generation device and the self-resetting device work simultaneously, so that the damper can provide a large damping force and self-resetting ability when vibrating.

[0079] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be combined with each other at will without conflict.

Claims

1. A self-resetting SMA tuned inertial mass damper, characterized in that, This includes an eddy current damping generator, a transmission device, and a self-resetting device; The eddy current damping generating device includes an outer cylinder (2), and the self-resetting device is located inside the outer cylinder (2) on the left side. The self-resetting device includes a second fixed disk (9) and a third fixed disk (10). The second fixed disk (9) and the third fixed disk (10) are both provided with a central hole at their center so that the transmission device can pass through. The third fixed disk (10) is located on the left side of the second fixed disk (9), and both ends of the third fixed disk (10) and the second fixed disk (9) are fixed to the inner wall of the outer cylinder (2). A first circular baffle (13) is provided on the right side of the second fixed disc (9), and a second circular baffle (14) is provided on the left side of the third fixed disc (10). A guide cylinder (18) is provided on the right side of the second circular baffle (14), and the transmission device passes through the eddy current damping generating device and is fixed to the guide cylinder (18). An elastic device is provided between the left side of the second circular baffle (14) and the left inner wall of the outer cylinder (2). A second spring (11) is sleeved on the transmission device between the first circular baffle (13) and the first fixed disc (8). A plurality of shape memory alloy rods (17) are provided between the second fixed disc (9) and the third fixed disc (10). The eddy current damping generating device further includes a first fixed disk (8), which is located on the right side inside the outer cylinder (2) and on the right side of the second fixed disk (9). Both ends of the first fixed disk (8) are fixed to the inner wall of the outer cylinder (2), and a central hole is provided in the center of the first fixed disk (8). An inner cylinder (4) is provided between the inner wall of the right side of the outer cylinder (2) and the first fixed disk (8). The inner cylinder (4) has openings on both sides, and conductors (5) are connected to both outer walls of the inner cylinder (4). Magnets (22) are provided on the upper inner wall and the lower inner wall of the outer cylinder (2) corresponding to the conductors (5), and a gap is left between the conductors (5) and the magnets (22). The transmission device includes a ball screw pair, which includes a ball screw (1) and a ball screw nut (3). The ball screw (1) passes through the inner cylinder (4) from the right side of the outer cylinder (2) and connects to the guide cylinder (18). The inner side of the inner cylinder (4) is connected to the ball screw nut (3). A gap is left between the opening of the inner cylinder (4) and the ball screw (1). A push-pull buckle (16) is placed in the center hole of the second fixed disc (9). The push-pull buckle (16) is fixedly connected to the ball screw (1) and there is a gap between the push-pull buckle (16) and the second fixed disc (9).

2. The self-resetting SMA tuned inertial mass damper according to claim 1, characterized in that, The elastic device includes a spring fixing shaft (19), which is disposed on the outer side of the second circular baffle (14). A spring fixing cylinder (20) is disposed between the spring fixing shaft (19) and the inner wall of the left side of the outer cylinder (2). A first spring (12) is disposed on the spring fixing shaft (19) and inside the spring fixing cylinder (20).

3. A self-resetting SMA tuned inertial mass damper according to claim 1, characterized in that, The shape memory alloy rod (17) is arranged parallel to the ball screw (1), and at least four shape memory alloy rods (17) parallel to the ball screw (1) are provided between the second fixed disk (9) and the third fixed disk (10). The shape memory alloy rod (17) is arranged between the second fixed disk (9) and the third fixed disk (10) by a fixing nut (15).

4. A self-resetting SMA tuned inertial mass damper according to claim 1, characterized in that, The inner cylinder (4) is connected to the inner wall of the right side of the outer cylinder (2) via a right rotating bearing (6), and the inner cylinder (4) is connected to the first fixed disc (8) via a left rotating bearing (7).

5. A self-resetting SMA tuned inertial mass damper according to claim 1, characterized in that, The magnet (22) is a permanent magnet.

6. A self-resetting SMA tuned inertial mass damper according to claim 1, characterized in that, Mounting holes (21) are provided on both outer sides of the outer cylinder (2).

7. An assembly method for a self-resetting SMA tuned inertial mass damper according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1, fix the conductor (5) on the two outer walls of the inner cylinder (4), and then fix the inner cylinder (4) on the ball screw nut (3); S2, fix the guide tube (18) and the spring fixing shaft (19) on both sides of the second circular baffle (14) respectively. The left ends of multiple memory alloy rods (17) pass through the center hole of the third fixing disk (10) and through the second circular baffle (14) and are fixed with fixing nuts (15). The right ends of multiple memory alloy rods (17) pass through the center hole of the second fixing disk (9). Insert the ball screw (1) through the center hole of the second fixing disk (9) into the guide tube (18) and fix the push-pull buckle (16) at the center hole of the second fixing disk (9). Then, put the first circular baffle (13) through the ball screw (1) onto the right end of the memory alloy rod (17) and fix it with fixing nuts (15). S3, the second spring (11), the first fixed disc (8), the left rotating bearing (7), the inner cylinder (4) with the ball screw nut (3) fixed and the right rotating bearing (6) are sequentially inserted into the right end of the ball screw (1). S4, a first spring (12) is set on the spring fixing shaft (19), a spring fixing cylinder (20) is fixed on the left side wall of the outer cylinder (2), a first spring (12) is set inside the spring fixing cylinder (20), the spring fixing shaft (19) is in contact with the spring fixing cylinder (20), and the magnet (22) is fixed on the upper inner wall and lower inner wall of the outer cylinder (2) corresponding to the conductor (5) with a gap between the conductor (5) and the magnet (22); S5, the outer cylinder (2) is welded together in sections by the first fixed disc (8), the second fixed disc (9) and the third fixed disc (10).

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