Self-resetting SMA (Shape Memory Alloy) tuning inertial damper and assembly method

Abstract

The invention discloses a self-resetting SMA tuning inertial damper and an assembly method, and relates to the technical field of building structure damping control, the self-resetting SMA tuning inertial damper comprises an eddy current damping generation device, a transmission device and a self-resetting device; the self-resetting device comprises a second fixing disc and a third fixing disc, center holes are formed in the centers of the second fixing disc and the third fixing disc, the third fixing disc is arranged on the left side of the second fixing disc, and the two ends of the third fixing disc and the two ends of the second fixing disc are fixed to the inner wall of the outer cylinder. A guide cylinder is arranged on the right side of the second circular baffle, and an elastic device is arranged between the left side of the second circular baffle and the inner wall of the left side of the outer cylinder. A second spring is arranged on the ball screw between the first circular baffle and the first fixed disc in a sleeving manner; a plurality of memory alloy bars are arranged between the second fixed disc and the third fixed disc; residual deformation of the building is reduced and even eliminated after the earthquake, and the post-earthquake repair cost of the structure is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure shock absorption control, and relates to a self-resetting SMA tuning inertial damper and an assembly method. Background Art

[0002] The anti-collapse design of the current specifications puts building structures at risk of demolition under strong earthquakes, while the highly developed economy of modern society requires that urban infrastructure can achieve post-earthquake functional recovery. Applying energy-absorbing and shock-absorbing devices with self-reset mechanisms and energy-absorbing mechanisms to building structures can improve the seismic performance of the structure and achieve an efficient and recoverable earthquake-proof structure. Such buildings have low maintenance costs after earthquakes and are easy to maintain after earthquakes.

[0003] Tuned inertia dampers have been widely studied and applied due to their advantages such as light weight, small size, fast response speed, and wide frequency adjustment range. Tuned inertia dampers change the single-end connection mode of traditional tuned mass dampers, and can achieve the purpose of changing structural inertia and tuning more flexibly and effectively. The inertia coefficient generated by the device is much larger than its own physical mass, and the inertia characteristics can be adjusted without basically changing the physical mass of the structure. The increased inertia of the inertia does not increase the seismic effect on the structure. However, tuned inertia dampers still have disadvantages such as weak energy dissipation capacity and no self-reset capability. In order to improve the energy dissipation capacity of the damper, relevant scholars introduced electromagnetic induction systems and developed eddy current tuned dampers, but the problem of self-reset capability has not yet been solved. The smart material Shape Memory Alloy (SMA) has excellent shape memory effect and superelastic effect, and can achieve the dual advantages of energy dissipation and self-reset at room temperature. The damper developed using SMA can maintain good reliability, corrosion resistance and fatigue resistance under large deformation. Combining SMA with a tuned inertial damper can improve the robustness of the damper and achieve the triple advantages of tuning, energy dissipation and self-reset.

[0004] Therefore, a self-resetting SMA tuned inertial damper and its assembly method are proposed, and the development of recoverable functional earthquake-proof structures has important economic value and social significance. Summary of the invention

[0005] The object of the present invention is to provide a self-resetting SMA tuned inertial damper and an assembly method thereof, so as to overcome the shortcomings of the prior art tuned inertial damper, such as insufficient energy consumption and inability to self-reset.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a self-resetting SMA tuned inertial damper, comprising an eddy current damping generating device, a transmission device and a self-resetting device; The eddy current damping generating device comprises an outer cylinder, the self-resetting device is arranged on the left side inside the outer cylinder, the self-resetting device comprises a second fixed disc and a third fixed disc, the centers of the second fixed disc and the third fixed disc are both provided with a center hole to allow the transmission device to pass through, the third fixed disc is arranged on the left side of the second fixed disc, and both ends of the third fixed disc and the second fixed disc are fixed on the inner wall of the outer cylinder; A first circular baffle is arranged on the right side of the second fixed disk, a second circular baffle is arranged on the left side of the third fixed disk, a guide cylinder is arranged on the right side of the second circular baffle, and a transmission device passes through the eddy current damping generating device and is fixed to the guide cylinder, an elastic device is arranged between the left side of the second circular baffle and the left inner wall of the outer cylinder; a second spring is sleeved on the transmission device between the first circular baffle and the first fixed disk; and a plurality of memory alloy rods are arranged between the second fixed disk and the third fixed disk.

[0007] Furthermore, the eddy current damping generating device further comprises a first fixed disc, which is arranged on the right side of the outer cylinder and on the right side of the second fixed disc, both ends of the first fixed disc are fixed to the inner wall of the outer cylinder and a center hole is arranged at the center of the first fixed disc; An inner cylinder is arranged between the right inner wall of the outer cylinder and the first fixed disc, the inner cylinder has openings on both sides, and the two outer side walls of the inner cylinder are connected with conductors, the upper inner wall of the outer cylinder and the lower inner wall of the outer cylinder at positions corresponding to the conductors are provided with magnets, and a gap is left between the conductors and the magnets.

[0008] Furthermore, the transmission device includes a ball screw pair, the ball screw pair includes 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 to the ball screw nut, and a gap is left between the opening of the inner cylinder and the ball screw.

[0009] Furthermore, the elastic device includes a spring fixing shaft, which is arranged on the outer side of the second circular baffle, a spring fixing cylinder is arranged between the spring fixing shaft and the left inner wall of the outer cylinder, a first spring is arranged on the spring fixing shaft, and a first spring is arranged in the spring fixing cylinder.

[0010] Furthermore, a push-pull buckle is placed in the center hole of the second fixed disc, the push-pull buckle is fixedly connected to the ball screw, and a gap is left between the push-pull buckle and the second fixed disc.

[0011] Furthermore, the memory alloy rod is arranged parallel to the ball screw, and at least four memory alloy rods parallel to the ball screw are arranged between the second fixed disc and the third fixed disc, and the memory alloy rod is arranged between the second fixed disc and the third fixed disc through a fixing nut.

[0012] Furthermore, the inner cylinder is connected to the right inner wall of the outer cylinder through a right rotating bearing, and the inner cylinder is connected to the first fixed disc through a left rotating bearing.

[0013] Furthermore, the magnet is a permanent magnet.

[0014] Furthermore, mounting holes are provided on the outer sides of both ends of the outer cylinder.

[0015] In another aspect, the present invention further provides a method for assembling a self-resetting SMA tuned inertial damper, comprising the following steps: S1, fix the conductor on the two outer walls of the inner cylinder, and then fix the inner cylinder on the ball screw nut; S2, fix the guide cylinder and the spring fixed shaft on both sides of the second circular baffle respectively, the left ends of the multiple memory alloy rods pass through the center hole of the third fixed disc and pass through the second circular baffle and fix with a fixing nut, and the right ends of the multiple memory alloy rods pass through the center hole of the second fixed disc; insert the ball screw through the center hole of the second fixed disc into the guide cylinder, and fix the push-pull buckle at the center hole of the second fixed disc, and then pass the first circular baffle through the ball screw and cover the right end of the memory alloy rod and fix it with a fixing nut; S3, insert the second spring, the first fixed disc, the left rotating bearing, the inner cylinder of the ball screw nut and the right rotating bearing into the right end of the ball screw in sequence; S4, a first spring is arranged on the spring fixing shaft, a spring fixing tube is fixed on the left wall of the outer tube, a first spring is arranged in the spring fixing tube, the spring fixing shaft is in contact with the spring fixing tube, and a magnet is fixed on the upper inner wall of the outer tube and the lower inner wall of the outer tube at positions corresponding to the conductor, and a gap is left between the conductor and the magnet; S5, welding the outer cylinder into one piece by section through the first fixed disc, the second fixed disc and the third fixed disc.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a self-resetting SMA tuned inertial damper, which dissipates a large amount of energy generated by earthquakes through an eddy current damping generating device and a self-resetting device, reduces the energy dissipation absorption of the load-bearing components of the building structure during the earthquake, thereby protecting the building structure; and the self-resetting device can restore the damper to its initial state after the earthquake, thereby reducing or even eliminating the residual deformation of the building after the earthquake, and reducing the cost of post-earthquake repair of the structure. The eddy current damping generating device of the present invention uses a ball screw to convert linear motion into high-speed rotational motion. The conversion of the linear motion of the screw and the rotational motion of the inner cylinder causes the inner cylinder to generate a rotational inertia moment, which can form a significant negative stiffness effect, extend the period of the structure, improve the seismic safety of the structure, and is beneficial to the seismic resistance of the structure.

[0017] Specifically, the invention can also increase the damping coefficient of the damper and change the size of eddy current damping by increasing the diameter of the inner cylinder, increasing the magnetic field strength of the magnet, and increasing the number of magnets, so as to adapt to different application scenarios and different requirements for damping force. This adjustability enhances the versatility of the device.

[0018] Specifically, the ball screw transmission adopted in the present invention is a standard mechanical transmission mode, and the self-resetting energy dissipation device is assembled, which is easy to realize standardized mass production, is convenient to connect with the building structure, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a transverse cross-sectional view of a self-resetting SMA tuned inertial damper in an embodiment of the present invention.

[0020] Figure 2 The figure is a schematic diagram of the overall structure of a self-resetting SMA tuned inertial damper in an embodiment of the present invention.

[0021] Figure 3 It is a longitudinal cross-sectional schematic diagram of a self-resetting device of a self-resetting SMA tuned inertial damper in an embodiment of the present invention.

[0022] Figure 4 It is a longitudinal cross-sectional schematic diagram of an eddy current damping generating device of a self-resetting SMA tuned inertial damper in an embodiment of the present invention.

[0023] In the figure, 1, ball screw, 2, outer cylinder, 3, ball screw nut, 4, inner cylinder, 5, conductor, 6, right rotating bearing, 7, left rotating bearing, 8, first fixed disk, 9, second fixed disk, 10, third fixed disk, 11, second spring, 12, first spring, 13, first circular baffle, 14, second circular baffle, 15, fixing nut, 16, push-pull bayonet, 17, memory alloy rod, 18, guide cylinder, 19, spring fixing shaft, 20, spring fixing cylinder, 21, mounting hole, 22, magnet. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] Example 1 See also Figures 1 to 4 , a self-resetting SMA tuned inertial damper, comprising an eddy current damping generating device, a transmission device and a self-resetting device; The eddy current damping generating device comprises an outer cylinder 2, the self-resetting device is arranged on the left side inside 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 thereof so that the transmission device can pass through, the third fixed disc 10 is arranged on the left side of the second fixed disc 9, and both ends of the third fixed disc 10 and the second fixed disc 9 are fixed on the inner wall of the outer cylinder 2; A first circular baffle 13 is arranged on the right side of the second fixed disc 9, a second circular baffle 14 is arranged on the left side of the third fixed disc 10, a guide cylinder 18 is arranged 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, and an elastic device is arranged 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 ball screw 1 between the first circular baffle 13 and the first fixed disc 8; and 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, and the memory alloy rod 17 is pulled while the elastic device is compressed. When the ball screw 1 moves axially to the right, the first circular baffle 13 is pushed by the push-pull buckle 16 fixed on the ball screw 1, and the memory alloy rod 17 is pulled while the second spring 11 is compressed.

[0027] The memory alloy rod 17 and the eddy current damping generating device generate a damping force to dissipate a large amount of energy, thereby reducing the energy dissipation absorption of the load-bearing components of the building structure during an earthquake. This damping force can effectively suppress vibration or slow down the movement speed.

[0028] In some preferred embodiments of the present invention, the elastic device includes a spring fixing shaft 19, which 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 left inner wall of the outer cylinder 2, a first spring 12 is arranged on the spring fixing shaft 19, and a first spring 12 is arranged in the spring fixing cylinder 20.

[0029] In some preferred embodiments of the present invention, the magnet 22 is a permanent magnet. In some preferred embodiments of the present invention, mounting holes 21 are provided on the outer sides of both ends of the outer tube 2, and the mounting holes facilitate the connection of the damper to the building.

[0030] In some preferred embodiments of the present invention, a mounting hole 21 is provided on the left side of the outer cylinder 2 for connection with a building, and one end of the outer cylinder 2 having the ball screw 1 is directly hinged to the building.

[0031] Example 2 On the basis of Example 1, the eddy current damping generating device further includes a first fixed disc 8, which is arranged on the right side inside the outer cylinder 2 and on the right side of the second fixed disc 9, both ends of the first fixed disc 8 are fixed to the inner wall of the outer cylinder 2 and a center hole is arranged in the center of the first fixed disc 8, and the center hole is for the convenience of the transmission device to pass through; An inner cylinder 4 is arranged between the right inner wall of the outer cylinder 2 and the first fixed disk 8. The inner cylinder 4 is a cylinder with openings on both sides, and the two outer side walls of the inner cylinder 4 are connected with conductors 5. The upper inner wall of the outer cylinder 2 and the lower inner wall of the outer cylinder 2 at positions corresponding to the conductors 5 are provided with magnets 22, and a gap is left between the conductors 5 and the magnets 22. 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 an eddy current effect is formed in the conductor 5 to generate a damping force. The eddy current will generate a force that hinders relative motion. This damping force can effectively convert mechanical energy into heat energy, suppress vibration or slow down the speed of movement, thereby achieving energy dissipation.

[0032] The inner cylinder 4 is connected to the right inner wall of the outer cylinder 2 via a right rotating bearing 6 , and the inner cylinder 4 is connected to the first fixed disk 8 via a left rotating bearing 7 .

[0033] In some preferred embodiments of the present invention, the transmission device includes a ball screw pair, the ball screw pair 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 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 to the ball screw nut 3, the rotational motion of the ball screw 1 is converted into the linear motion of the inner cylinder 4, and a gap is left between the opening of the inner cylinder 4 and the ball screw 1.

[0034] In some preferred embodiments of the present invention, a push-pull buckle 16 is placed in the center hole of the second fixed disc 9, and the push-pull buckle 16 is fixedly connected to 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 in 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 remains in a predetermined linear direction.

[0035] In some preferred embodiments of the present invention, the push-pull bayonet 16 is fixedly connected to the ball screw 1 by welding.

[0036] Energy dissipation principle: The additional damping required for the building is obtained through theoretical calculation and numerical simulation. The eddy current damping generating device and the self-reset device of the present invention will generate additional damping. In the eddy current damping generating device, the inner cylinder 4 and the conductor 5 fixed on the ball screw nut 3 and the magnet 22 fixed on the outer cylinder 2 are rotated relative to each other through the ball screw amplitude. Since the magnetic flux lines of the magnet 22 fixed on the outer cylinder 2 are mostly perpendicular to the conductor 5 tube, as the ball screw nut 3 rotates, the conductor 5 tube cuts the magnetic flux lines to generate eddy currents. After the eddy currents are generated, the conductor circulates and releases heat, and a damping force that hinders the mutual movement of the two is formed. Therefore, the eddy current device will generate a large damping coefficient. During the generation process, the eddy currents will convert mechanical energy into heat energy, thereby realizing energy dissipation. In mechanical structures subjected to shock or vibration, it can prevent excessive accumulation of energy and damage to the structure.

[0037] Assume that the equivalent damping coefficient at a single magnet 22 of the eddy current device is c 1, then the equivalent axial damping coefficient c for (1) in, r is the outer diameter of the conductor 5 round tube; l is the lead of ball screw 1; r Much greater than l , then the equivalent axial damping coefficient c The equivalent damping coefficient at a single magnet 22 can be c The equivalent damping coefficient of the eddy current damping device is the sum of the equivalent damping coefficients of the individual magnets 22.

[0038] In addition to the damping force mentioned above, there is also an axial inertia force generated by the apparent mass that hinders the axial movement of the damper. The apparent mass is the result of the ball screw 1 converting the linear motion into high-speed rotational motion. The conversion of the linear motion of the screw and the rotational motion of the inner cylinder 4 causes the inner cylinder 4 to generate a rotational inertia moment, which is then converted into a large apparent mass through the ball screw pair. The lead of the ball screw 1 is l The rotational inertia of each part is I . Let its apparent mass be m r (2) It can be seen that when the lead l When the mass is very small, it can form a large apparent mass, which then generates an axial inertia force that hinders the axial movement of the damper, making the damper have a large negative stiffness effect, extending the period of the structure, improving the seismic safety of the structure, and being beneficial to the seismic resistance of the structure. In some preferred embodiments of the present invention, 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 fixing nut 15. Six memory alloy rods 17 are used in the application of this embodiment.

[0039] According to the required restoring force of the building structure, the output value of the damper is determined, and the memory alloy rod and spring are selected according to the expression of the damper output, and the memory alloy rod 17 is processed; The expression of the damper output is: F=f y A s + kx+cv+m r a (3); in, f y is the maximum recovery stress of the memory alloy rod 17, f y A s The maximum restoring force of the memory alloy rod 171, k is the stiffness of the spring, kx is the restoring force of the spring, c is the equivalent axial damping coefficient of the eddy current damping generating device, m r is the apparent mass of the eddy current system, v is the axial speed of the damper ball screw, a is the difference in acceleration between the free and fixed ends of the damper.

[0040] The processing of the memory alloy rod 17 is specifically as follows: Step 1: Calculate the thread lengths at both ends of the memory alloy rod according to formula (4): (4); in, f u is the ultimate tensile strength of the memory alloy rod 17, A s is the cross-sectional area of ​​all memory alloy rods 17, σ t is the allowable extrusion stress of the memory alloy rod 17 thread, d s is the nominal diameter of the memory alloy rod 17, l t is the minimum thread length; Step 2: Select according to the threading distance and threading depth of the parent material diameter; Step 3: Select nuts with sizes corresponding to the threading spacing and threading depth and anchor them at both ends of the membrane alloy rod, and the nut length is 20 mm.

[0041] Example 3 The present invention also provides an assembly method of a self-resetting SMA tuned inertial damper, which specifically comprises the following steps: S1, first, accurately fix the conductor 5 on the two outer side walls of the inner cylinder 4. During the fixing process, ensure that the connection between the conductor 5 and the inner cylinder 4 is firm and stable, and use a suitable fixing method, such as welding, bolt connection or a special clamping device, to prevent the conductor 5 from loosening or displacement during subsequent use; after completing the fixing of the conductor 5, then accurately fix the inner cylinder 4 on the ball screw nut 3; S2, first firmly fix the guide cylinder 18 on one side of the second circular baffle 14, and at the same time firmly fix the spring fixing shaft 19 on the other side of the second circular baffle 14. Be careful when installing multiple memory alloy rods 17. Pass the left end of each memory alloy rod 17 through the center hole of the third fixed disc 10 in turn, and continue to pass through the second circular baffle 14, and then use the fixing nut 15 to fix it, ensuring that each memory alloy rod 17 is reliably fixed at this position without loosening or shaking. After that, pass the right ends of multiple memory alloy rods 17 through the center hole of the second fixed disc 9. Subsequently, carefully pass the ball screw 1 through the center hole of the second fixed disc 9, and accurately embed it into the guide cylinder 18, and firmly fix the push-pull buckle 16 at the center hole of the second fixed disc 9. After completing these operations, pass the first circular baffle 13 through the ball screw 1, and put it on the right end of the memory alloy rod 17, and finally use the fixing nut 15 to fix it, ensuring that the connection between the various components is tight and meets the design requirements; S3, after the above steps are completed, install the components on the right end of the ball screw 1 in turn. First, insert the second spring 11 to ensure that the spring is installed accurately and its elastic properties are not damaged; then insert the first fixed disk 8 to make it fit tightly with the ball screw 1 to provide stable support for subsequent components. After that, install the left rotating bearing 7 to ensure that the bearing is installed correctly and can rotate smoothly to reduce the friction and wear of the ball screw 1 during rotation. Then, insert the inner cylinder 4 with the ball screw nut 3 fixed into the ball screw 1 so that the inner cylinder 4 can achieve linear motion under the drive of the ball screw 1. Finally, install the right rotating bearing 6 to further ensure the flexibility and stability of the entire transmission system during operation; S4, set the first spring 12 on the spring fixing shaft 19, and pay attention to the installation direction and initial state of the spring; at the same time, firmly fix the spring fixing tube 20 on the left side wall of the outer tube 2, and set the first spring 12 in the spring fixing tube 20, so that the spring fixing shaft 19 and the spring fixing tube 20 can be in close contact, ensuring that the spring can effectively play its elastic role during the working process; in addition, accurately fix the magnet 22 on the upper inner wall of the outer tube 2 and the lower inner wall of the outer tube 2 at the position corresponding to the conductor 5. During the fixing process, special attention should be paid to maintaining a suitable gap between the conductor 5 and the magnet 22 to ensure the generation of eddy current and the normal realization of the damping function; S5, finally, the outer cylinder 2 is welded in sections through the first fixed disc 8, the second fixed disc 9 and the third fixed disc 10; during the welding process, appropriate welding technology and equipment should be used to ensure welding quality and avoid welding defects such as pores and cracks. Ensure that each welding position can firmly connect various components, so that the entire outer cylinder 2 forms a stable overall structure, providing reliable protection and support for various internal components, thereby completing the assembly process of the entire device.

[0042] Working principle of the present invention: When the controlled structure vibrates laterally, the eddy current damping generating 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 enables the memory alloy rod 17 to always remain in a tension state through the axial movement of the ball screw 1. When the second fixed disk 9 and the third fixed disk 10 move laterally, the first spring 12 and the second spring 11 can always remain in compression. The eddy current damping generating device and the self-resetting device work simultaneously, so that the damper provides a large damping force and self-resetting ability when vibrating.

[0043] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A self-resetting SMA tuned inertial damper, characterized in that: It includes an eddy current damping generating device, a transmission device and a self-resetting device; The eddy current damping generating device comprises an outer cylinder (2), the self-resetting device is arranged on the left side inside 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 thereof so that a transmission device can pass through, the third fixed disc (10) is arranged on the left side of the second fixed disc (9), and both ends of the third fixed disc (10) and the second fixed disc (9) are fixed to the inner wall of the outer cylinder (2); A first circular baffle (13) is arranged on the right side of the second fixed circular disc (9), a second circular baffle (14) is arranged on the left side of the third fixed circular disc (10), a guide cylinder (18) is arranged on the right side of the second circular baffle (14), and a transmission device passes through the eddy current damping generating device and is fixed to the guide cylinder (18), an elastic device is arranged 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 circular disc (8); and a plurality of memory alloy rods (17) are arranged between the second fixed circular disc (9) and the third fixed circular disc (10).

2. A self-resetting SMA tuned inertial damper according to claim 1, characterized in that: The eddy current damping generating device further comprises a first fixed disc (8), the first fixed disc (8) being arranged on the right side inside the outer cylinder (2) and on the right side of the second fixed disc (9), both ends of the first fixed disc (8) being fixed to the inner wall of the outer cylinder (2) and a center hole being arranged at the center of the first fixed disc (8); An inner cylinder (4) is arranged between the right inner wall of the outer cylinder (2) and the first fixed disc (8), the inner cylinder (4) has openings on both sides, and the two outer walls of the inner cylinder (4) are connected to a conductor (5), and magnets (22) are arranged on the upper inner wall of the outer cylinder (2) and the lower inner wall of the outer cylinder (2) at positions corresponding to the conductor (5), and a gap is left between the conductor (5) and the magnet (22).

3. A self-resetting SMA tuned inertial damper according to claim 2, characterized in that: The transmission device comprises a ball screw pair, the ball screw pair comprising 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 inner side of the inner cylinder (4) is connected to the ball screw nut (3), and a gap is left between the opening of the inner cylinder (4) and the ball screw (1).

4. The self-resetting SMA tuned inertial damper according to claim 1, characterized in that: The elastic device comprises a spring fixing shaft (19), the spring fixing shaft (19) being arranged on the outer side surface of the second circular baffle (14), a spring fixing cylinder (20) being arranged between the spring fixing shaft (19) and the left inner wall of the outer cylinder (2), a first spring (12) being arranged on the spring fixing shaft (19), and a first spring (12) being arranged in the spring fixing cylinder (20).

5. The self-resetting SMA tuned inertial damper according to claim 3, characterized in that: 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 a gap is left between the push-pull buckle (16) and the second fixed disc (9).

6. The self-resetting SMA tuned inertial damper according to claim 3, characterized in that: 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) via a fixing nut (15).

7. The self-resetting SMA tuned inertial damper according to claim 2, characterized in that: The inner cylinder (4) is connected to the right inner wall 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).

8. The self-resetting SMA tuned inertial damper according to claim 2, characterized in that: The magnet (22) is a permanent magnet.

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

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

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