Self-resetting rotational damper
By using the friction surface and deformation energy dissipation between the SMA energy dissipation ring and the boss in the rotating damper, the problems of complex installation and residual displacement of existing rotating dampers are solved, realizing self-resetting without prestress and simplified assembly, thus improving energy dissipation performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGZHOU UNIVERSITY
- Filing Date
- 2023-11-03
- Publication Date
- 2026-07-07
AI Technical Summary
Existing rotary dampers generate large residual displacements under strong earthquakes and are complex to install, lacking self-resetting devices that do not require prestress.
The SMA energy dissipation ring forms a friction surface with the first and second bosses. The assembly process does not require welding or bolting. The self-resetting function of the SMA energy dissipation ring is used to realize the self-resetting of the damper, which combines friction energy dissipation and deformation energy dissipation.
It achieves a self-resetting function without the need for prestressed installation, simplifies the assembly process, improves the energy dissipation performance and self-resetting capability of the structure, and reduces residual deformation.
Smart Images
Figure CN117403796B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of energy-dissipating components in building structures, and in particular to a self-resetting rotational damper. Background Technology
[0002] Earthquakes pose a significant threat to human property and safety. Energy dissipation and vibration reduction technologies can effectively mitigate the response of buildings under seismic loads. Under seismic loads, structures exhibit substantial rotational deformation, such as at beam-column joints and beam-wall joints. Rotational dampers can effectively dissipate energy in the rotational direction, offsetting external forces on the structure, maintaining its stability, and reducing resonance amplitude. While some research has been conducted on rotational dampers both domestically and internationally, those without self-resetting capabilities still produce significant residual displacement under strong earthquakes. Rotational dampers capable of achieving rotational self-resetting are relatively rare.
[0003] Traditional self-resetting devices all require a certain amount of prestress to be applied before they are put into use in order to give them the ability to reset. The objects to which the prestress is applied are usually SMA cables or wires, rods, steel strands, disc springs, etc., which makes the device structure complex and the installation process complicated, making it difficult to control the quality. There is a lack of self-resetting devices that do not require the application of prestress. Summary of the Invention
[0004] The purpose of this invention is to provide a self-resetting rotational damper that can achieve self-resetting function without the need for pre-stress; the assembly process does not require welding or bolting, making installation convenient.
[0005] This invention provides a self-resetting rotational damper, comprising a first rotational assembly, a second rotational assembly, and an SMA energy-dissipating ring. The first rotational assembly has a first boss, and the second rotational assembly has a second boss. The second boss has the same shape as the first boss. The SMA energy-dissipating ring is sleeved on the outside of the first boss and the second boss, connecting the first rotational assembly and the second rotational assembly. The SMA energy-dissipating ring forms a friction surface with the first boss and the second boss, and a pin passes through the center of the first boss and the second boss.
[0006] Preferably, the first rotating assembly includes a first connecting plate, on which two symmetrical first shear plates are vertically arranged; the second rotating assembly includes a second connecting plate, on which a second shear plate is vertically arranged at its center, the second shear plate being located between the two first shear plates, each of the first shear plates having a first through hole located at the center of the first boss, the second shear plate having a second through hole corresponding to the first through hole located at the center of the second boss, and the pin passing through the first through hole and the second through hole in sequence.
[0007] Preferably, both ends of the pin extend outward through the first shear plate and are threadedly connected to the nut.
[0008] Preferably, the diameter of the pin is the same as the diameter of the first through hole and the second through hole.
[0009] Preferably, the second shear plate is provided with a second protrusion on both sides opposite to the two first shear plates, and the first shear plate is provided with a first protrusion on the side of the first shear plate closer to the second shear plate. The SMA energy dissipation ring is sleeved on the adjacent first protrusion and second protrusion.
[0010] Preferably, the sum of the heights of the first boss and the second boss is equal to the height of the SMA energy dissipation ring.
[0011] Preferably, the outer contours of the first boss and the second boss are polygonal or closed corrugated.
[0012] Preferably, the outer contours of the first boss and the second boss are regular octagons.
[0013] Preferably, the outer contours of the first boss and the second boss are the same as the inner contour of the SMA energy dissipation ring.
[0014] Preferably, the SMA energy dissipation ring is made of a superelastic shape memory alloy.
[0015] Beneficial effects:
[0016] The self-resetting rotation damper provided by this invention can achieve the self-resetting function without the need for pre-stress; the assembly process does not require welding or bolting, making installation convenient and facilitating production quality control.
[0017] The present invention utilizes the friction surfaces formed between the SMA energy-dissipating ring and the first and second protrusions to generate sliding friction, providing resistance to the relative rotation between the first and second protrusions; when the first and second protrusions rotate relative to each other, a force is applied to the SMA energy-dissipating ring, causing it to expand and deform, thereby improving the energy dissipation performance of the structure. Attached Figure Description
[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0020] Figure 2 This is a schematic diagram showing the structural breakdown of the present invention;
[0021] Figure 3 This is a schematic diagram of the first rotating component structure of the present invention;
[0022] Figure 4 This is a schematic diagram of the structure of the second rotating component of the present invention;
[0023] Figure 5 This is a schematic diagram of the hysteresis loop curve of the self-resetting rotational damper in Embodiment 1 of the present invention.
[0024] Explanation of reference numerals in the attached figures:
[0025] 11-First connecting plate, 12-First shearing plate, 13-First boss, 14-First through hole, 21-Second shearing plate, 22-Second connecting plate, 23-Second boss, 24-Second through hole, 3-Pin, 4-SMA energy dissipation ring. Detailed Implementation
[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.
[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0029] Example 1
[0030] like Figures 1-4 As shown, a self-resetting rotational damper includes a first rotational assembly, a second rotational assembly, and an SMA energy-dissipating ring 4. The first rotational assembly includes a first connecting plate 11, on which two symmetrical first shear plates 12 are vertically arranged. The second rotational assembly includes a second connecting plate 22, on which a second shear plate 21 is vertically arranged at its center. The first and second rotational assemblies are placed opposite each other, with the second shear plate 21 located between the two first shear plates 12. Second bosses 23 are provided on both sides of the second shear plate 21 opposite to the two first shear plates 12. A first boss 13 is provided on the side of the first shear plate 12 closest to the second shear plate 21. The second boss 23 has the same shape as the first boss 13, and the outer contours of the first boss 13 and the second boss 23 are polygonal or closed corrugated. Preferably, the outer contours of the first boss 13 and the second boss 23 are regular octagons.
[0031] The outer contours of the first boss 13 and the second boss 23 are aligned. The SMA energy-dissipating ring 4 is sleeved on the adjacent first boss 13 and second boss 23, connecting the first rotating assembly and the second rotating assembly. A friction surface is formed between the SMA energy-dissipating ring 4 and the first boss 13 and the second boss 23. The sum of the heights of the first boss 13 and the second boss 23 is equal to the height of the SMA energy-dissipating ring 4. Furthermore, the sum of the heights of the first boss 13 and the second boss 23 is equal to the distance between the first shear plate 12 and the second shear plate 21, preventing unstable connections. The outer contours of the first boss 13 and the second boss 23 are the same as the inner contour of the SMA energy-dissipating ring 4, ensuring a large contact area of the friction surface and making the connection between the first rotating assembly and the second rotating assembly more stable.
[0032] Each of the first shear plates 12 has a first through hole 14 located at the center of the first boss 13. The second shear plate 21 has a second through hole 24 corresponding to the first through hole 14, located at the center of the second boss 23. A pin 3 passes through the first through hole 14 and the second through hole 24 sequentially. The diameter of the pin 3 is the same as the diameter of the first through hole 14 and the second through hole 24, ensuring a more stable connection between the first and second rotating components. Both ends of the pin 3 extend outwards through the first shear plate 12 and are threadedly connected to a nut, thus fixing the SMA energy-dissipating ring 4 between the first shear plate 12 and the second shear plate 21, ensuring a smooth friction surface.
[0033] The SMA energy-dissipating ring 4 is made of superelastic shape memory alloy, and the first rotating component and the second rotating component are made of metal, preferably steel.
[0034] When the outer contours of the first boss 13 and the second boss 23 and the inner contour of the SMA energy dissipation ring 4 are regular octagons, the schematic diagram of the hysteresis loop of the self-resetting rotation damper in this embodiment is as follows. Figure 5 As shown, the horizontal axis represents the rotational deformation of the damper, and the vertical axis represents the torque generated by the damper. Unlike the flag-shaped traditional self-resetting damper, it is a centripetal hysteresis loop with no obvious yield point. After unloading, it generates hysteretic energy dissipation through the change of unloading stiffness, and can completely return to the origin after complete unloading without residual deformation, thus exhibiting excellent self-resetting performance.
[0035] Working principle:
[0036] Under seismic loading, when the first and second rotating components rotate relative to each other, friction occurs between the first protrusion 13 and the second protrusion 23 and the SMA energy-dissipating ring 4. As the first protrusion 13 and the second protrusion 23 rotate relative to each other, the SMA energy-dissipating ring 4 expands and deforms under the influence of this relative rotation, thus preventing further rotation between the first and second rotating components. This process involves multiple energy dissipation mechanisms, including frictional energy dissipation between the first protrusion 13, the second protrusion 23, and the SMA energy-dissipating ring 4, as well as energy dissipation due to deformation of the SMA energy-dissipating ring 4 itself.
[0037] When the first rotating component and the second rotating component are unloaded and subjected to force, the SMA energy dissipation ring 4, due to the self-resetting function of the superelastic shape memory alloy, shrinks and restores its shape, which can drive the first boss 13 and the second boss 23 to return to their state before deformation, thereby driving the first rotating component and the second rotating component to return to their state before rotation, thus realizing the self-resetting function.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A self-resetting rotational damper, characterized in that, The assembly includes a first rotating component, a second rotating component, and an SMA energy-dissipating ring. The first rotating component has a first boss, and the second rotating component has a second boss with the same shape as the first boss. The SMA energy-dissipating ring is sleeved on the outside of the first and second bosses, connecting the first and second rotating components. The SMA energy-dissipating ring forms a friction surface with the first and second bosses, and a pin passes through the center of the first and second bosses. The first rotating assembly includes a first connecting plate with two symmetrical first shear plates vertically arranged on it. The second rotating assembly includes a second connecting plate with a second shear plate vertically arranged at its center, located between the two first shear plates. Each of the first shear plates has a first through hole located at the center of a first boss. The second shear plate has a second through hole corresponding to the first through hole located at the center of a second boss. The pin passes through the first through hole and the second through hole in sequence. The second shear plate has a second protrusion on both sides opposite to the two first shear plates, and the first shear plate has a first protrusion on the side closer to the second shear plate. The SMA energy dissipation ring is sleeved on the adjacent first protrusion and second protrusion.
2. The self-resetting rotational damper according to claim 1, characterized in that, Both ends of the pin extend outward through the first shear plate and are threadedly connected to the nut.
3. The self-resetting rotational damper according to claim 1, characterized in that, The diameter of the pin is the same as the diameter of the first through hole and the second through hole.
4. The self-resetting rotational damper according to claim 1, characterized in that, The sum of the heights of the first boss and the second boss is equal to the height of the SMA energy dissipation ring.
5. The self-resetting rotational damper according to claim 1, characterized in that, The outer contours of the first boss and the second boss are polygonal or closed corrugated.
6. The self-resetting rotational damper according to claim 5, characterized in that, The outer contours of the first boss and the second boss are regular octagons.
7. The self-resetting rotational damper according to claim 1, characterized in that, The outer contours of the first boss and the second boss are the same as the inner contour of the SMA energy dissipation ring.
8. The self-resetting rotational damper according to claim 1, characterized in that, The SMA energy dissipation ring is made of superelastic shape memory alloy.