Multi-layer spring low-frequency tuned mass damper

Abstract

The utility model discloses a multi-layer spring low-frequency tuned mass damper, which comprises a structural frame, and a mass block guide component and a spring guide component are arranged on the structural frame; the stiffness system comprises at least one group of multi-layer springs, each group of multi-layer springs comprises at least two layers of springs which are connected in series up and down, and a spring limiting part is arranged between every two adjacent layers of springs; the mass block is mounted on the mounting plate; wherein the multiple layers of springs are supported below the mounting plate, the spring limiting component is in up-and-down sliding fit along the spring guide component, and the mounting plate is in up-and-down sliding fit along the mass block guide component. The damping effect is good and the overall size is small.

Description

Technical Field

[0001] This utility model relates to the field of structural vibration reduction technology, and in particular to a multi-layer spring low-frequency tuned mass damper. Background Technology

[0002] With the advancement of science and technology, especially the improvement of design methods, construction techniques, and material properties, modern long-span bridges, particularly suspension bridges and cable-stayed bridges, are continuously developing towards greater lengths. The main problem brought about by the significant increase in bridge span is the sharp decrease in structural stiffness, making the bridge structure more susceptible to vibrations caused by wind loads and vehicle loads, which greatly affects the stability, safety, and serviceability of the bridge.

[0003] There are many types of vibration control measures for bridges, including active and passive measures, as well as mechanical and pneumatic measures. However, from a practical perspective, using tuned mass dampers (TMDs) for vibration reduction is an effective method. It has advantages such as simplicity, reliability, effectiveness, easy installation, and convenient maintenance and replacement, and has been widely used in vibration control of civil engineering structures.

[0004] However, long-span bridges are characterized by flexibility, with relatively low dominant frequencies, typically between 0.2Hz and 1Hz, and significantly larger amplitudes than pedestrian bridges. Combined with their large modal masses, this results in a large TMD (Transient Modal Mass) structure, which can even affect its installation and arrangement on the bridge. Therefore, the design of such low-frequency TMDs requires low spring stiffness and large compressive displacement. Existing structures can be categorized into single-layer and multi-layer springs. Single-layer springs, due to their large height-to-diameter ratio, are prone to tilting and bending. Even with the addition of guide components, the contact between the deformed spring and the guide components, along with prolonged vibration and friction, will damage the spring's anti-corrosion coating and reduce its lifespan. When using multi-layer springs, the mass block is mainly placed at the top, leading to an excessively tall TMD structure. For most box girders, which are mostly flat, an excessively tall TMD structure is difficult to accommodate. While the structure described in invention patent CN 111622368 A can solve the problem of TMD height, it introduces an excessive number of horizontally arranged springs, creating a new problem of excessively large lateral dimensions. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a multi-layer spring low-frequency tuned mass damper that addresses the above-mentioned shortcomings of the prior art, with good damping effect and small overall size.

[0006] The technical solution adopted in this utility model is:

[0007] A multi-layer spring low-frequency tuned mass damper includes: a structural frame with a mass block guide member and a spring guide member on the structural frame; a stiffness system including at least one set of multi-layer springs, each set of multi-layer springs including at least two layers of springs connected in series, and a spring limiting member between adjacent layers of springs; and a mass block mounted on a mounting plate; wherein the multi-layer springs are supported below the mounting plate, the spring limiting member slides up and down along the spring guide member, and the mounting plate slides up and down along the mass block guide member.

[0008] In one embodiment, the end of the spring limiting member is provided with a groove, and the spring guide member is engaged in the groove.

[0009] In one embodiment, the contact edge between the spring limiting member and the spring guiding member is provided with a rolling pair or a sliding block, and the spring limiting member slides on the spring guiding member through the rolling pair, or the spring limiting member slides on the spring guiding member through the sliding block.

[0010] In one embodiment, the mass block guide member is an upright guide shaft, and the mounting plate is provided with a sliding ring, which is sleeved around the mass block guide member.

[0011] In one embodiment, a damping system is provided between the mass block and the structural frame.

[0012] In one embodiment, the damping system is eddy current damping, viscous damping, or polymer damping.

[0013] In one embodiment, the spring limiting member spans two sets of the multilayer springs and connects the two sets of the multilayer springs.

[0014] In one embodiment, several sets of the multi-layered springs surround the mass block in the center.

[0015] In one embodiment, a multilayer spring low-frequency tuned mass damper further includes an auxiliary plate and an auxiliary spring system. The auxiliary plate has a recessed platform, and an outwardly extending wing plate is provided on the upper edge of the recessed platform. The auxiliary spring system is supported under the wing plate, and the stiffness system is located on the recessed platform.

[0016] In one embodiment, the auxiliary spring system includes at least one set of auxiliary springs, the auxiliary springs include at least two layers of auxiliary springs connected in series, an auxiliary limiting component is provided between two adjacent layers of auxiliary springs, the structural frame is provided with an auxiliary guide component, and the auxiliary limiting component slides up and down along the auxiliary guide component.

[0017] Compared with the prior art, the multi-layer spring low-frequency tuned mass damper of this utility model has the following advantages:

[0018] 1. The spring limiting component works in conjunction with the spring guiding component to ensure that the multi-layer spring moves elastically in a predetermined direction. Using multiple springs in series can reduce the height-to-diameter ratio of each individual spring to a reasonable range, preventing instability due to reciprocating compression. By setting the spring guiding component and the spring limiting component, the series-connected multi-layer springs can maintain a stable compression-elongation shape, thereby reducing the cross-sectional area of ​​the springs and increasing the height of the multi-layer springs. This allows the mass block to be placed around the perimeter of the spring instead of at the top, and the movement stroke of the mass block overlaps with the compression-elongation stroke of the spring, ultimately reducing the overall height and width.

[0019] 2. In addition to the rebound force provided by the stiffness system, an auxiliary spring system is added to provide greater rebound force. The height of the auxiliary spring system and the stiffness system partially overlaps, allowing for an additional layer of spring buffer without increasing the overall height of the damper, thereby improving the damper's load-bearing capacity. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of this utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the main structure of Embodiment 1 of this utility model. Figure 2 ;

[0023] Figure 3 This is a side view of the structure of Embodiment 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the main structure of the spring limiting component in Embodiment 1 of this utility model;

[0025] Figure 5 This is a top view of the spring limiting component in Embodiment 1 of this utility model. Figure 1 ;

[0026] Figure 6 This is a top view of the spring limiting component in Embodiment 1 of this utility model. Figure 2 ;

[0027] Figure 7 This is a schematic diagram of the structure of the damping system using eddy current damping in Embodiment 1 of this utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the damping system using viscous damping in Embodiment 1 of this utility model;

[0029] Figure 9 This is a schematic diagram of the structure of the polymer damping system used in Embodiment 1 of this utility model;

[0030] Figure 10 This is a schematic diagram of the main structure of Embodiment 2 of this utility model;

[0031] Figure 11 This is a side view of the structure of Embodiment 2 of this utility model. Figure 1 ;

[0032] Figure 12 This is a side view of the structure of Embodiment 2 of this utility model. Figure 2 ;

[0033] Figure 13 This is a schematic diagram of the main structure of the auxiliary plate in Embodiment 2 of this utility model;

[0034] Figure 14 This is a top view of the auxiliary plate in Embodiment 2 of this utility model. Figure 1 ;

[0035] Figure 15 This is a top view of the auxiliary plate in Embodiment 2 of this utility model. Figure 2 ;

[0036] Figure 16 This is a schematic diagram of the main structure of Embodiment 3 of this utility model. Figure 1 ;

[0037] Figure 17 This is a schematic diagram of the main structure of Embodiment 3 of this utility model. Figure 2 .

[0038] Among them: 1-Structural frame, 2-Stiffness system, 3-Mass block, 4-Mass block guide component, 5-Spring guide component, 6-Multi-layer spring, 7-Spring limiting component, 8-Spring, 9-Mounting plate, 10-Groove, 11-Upper frame, 12-Lower frame, 13-Column, 14-Guide rail, 15-Sliding ring, 16-Damping system, 17-Eddy current damping, 18-Or viscous damping, 19-Polymer damping, 20-Non-magnetic conductor, 21-Permanent magnet, 22-Viscoelastic damper, 23-Polymer material, 24-Limiting block, 25-Rolling pair, 26-Sliding block, 31-Auxiliary plate, 32-Auxiliary spring system, 33-Concave platform, 34-Wing plate, 35-Auxiliary spring group, 36-Auxiliary spring, 37-Auxiliary limiting component, 38-Auxiliary guide component. Detailed Implementation

[0039] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0040] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," 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 utility model 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 limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Example 1

[0043] See Figures 1 to 9As shown, this embodiment of a multi-layer spring low-frequency tuned mass damper includes: a structural frame 1, on which a mass block guide member 4 and a spring guide member 5 are provided; a stiffness system 2, which includes at least one set of multi-layer springs 6, each set of multi-layer springs 6 including at least two layers of springs 8 connected in series, with a spring limiting member 7 between adjacent layers of springs 8; and a mass block 3, which is mounted on a mounting plate 9. The multi-layer springs 6 are supported below the mounting plate 9, and the spring limiting member 7 slides vertically along the spring guide member 5, while the mounting plate 9 slides vertically along the mass block guide member 4. In this embodiment, the spring limiting member 7 and the spring guide member 5 work together to ensure that the multi-layer springs 6 move elastically in a predetermined direction. The mounting plate 9 and the mass block guide member 4 work together to ensure that the mass block 3 moves elastically in a predetermined direction. A spring limiting member 7 is provided between every two layers of springs 8, and the spring limiting member 7 slides vertically with the spring guide member 5 to ensure that the multi-layer springs 6 move elastically in a predetermined direction. By using a series of multi-layer springs 6, the height-to-diameter ratio of each single-layer spring 8 can be reduced to a reasonable range, avoiding instability caused by the reciprocating compression of a single-layer spring 8. This solves the problem of excessive height-to-diameter ratio in single-layer springs 8 to achieve sufficient expansion and contraction displacement, which easily leads to tilting and instability during expansion and contraction. Furthermore, by setting up spring guide components 5 and spring limiting components 7, the series-connected multi-layer springs 6 can maintain a stable compression-extension shape, thereby reducing the cross-sectional area of ​​spring 8 and increasing the height of multi-layer springs 6. This allows the mass block 3 to be placed around the periphery of spring 8 instead of on top of it. The movement stroke of the mass block 3 overlaps with the compression and extension stroke of spring 8, ultimately reducing the overall height and width.

[0044] like Figure 5 , 6 As shown, the spring limiting component 7 has grooves 10 at both ends, and the spring guide component 5 is inserted into the grooves 10. In this embodiment, the structural frame 1 includes an upper frame 11, a lower frame 12, and a column 13 located on the upper frame 11 and the lower frame 12 for self-inspection. The column 13 is provided with a guide rail 14. The cross-section of the column 13 and the guide rail 14 is convex. The column 13 and the guide rail 14 constitute the spring guide component 5. The cross-section of the spring guide component 5 is convex. The top of the convex shape is inserted into the groove 10, and the end face of the spring guide component 5 abuts against the two wings of the convex shape. Figure 1 As shown, the spring guide member 5 has a limit block 24 at the top of the stroke of the spring limiting member 7 to limit the maximum position of the spring limiting member 7 sliding upward.

[0045] In this embodiment, grooves 10 are provided at both ends of the spring guide member 5. The spring limiting member 7 is constrained to slide on the spring guide member 5 by inserting the two ends into the grooves 10. However, this embodiment is not limited to this one. The spring guide member 5 can also be constrained by providing through holes in the spring limiting member 7 and inserting the guide rail 14 through the through holes.

[0046] The contact edge between the spring limiting component 7 and the spring guiding component 5 is provided with a rolling pair 25 or a sliding block 26. The spring limiting component 7 slides on the spring guiding component 5 through the rolling pair 25 or through the sliding block 26. This ensures that the spring limiting component 7 slides smoothly on the spring guiding component 5 and avoids instability.

[0047] like Figure 3 As shown, the mass block guide member 4 is a vertical guide shaft, and the mounting plate 9 is provided with a sliding ring 15, which is sleeved on the mass block guide member 4. The mass block 3 is usually quite heavy, and using the guide shaft passing through the sliding ring 15 to constrain it is more stable and can better guide the movement trajectory of the mass block 3, avoiding instability.

[0048] A damping system 16 is provided between the bottom of mass block 3 and structural frame 1. By incorporating dampers to dissipate energy, disturbances can be smoothed out more quickly. The damping system 16 can be eddy current damping 17, viscous damping 18, or polymer damping 19. For example... Figure 7 As shown, the eddy current damper 17 includes a non-magnetic conductor 20 and a permanent magnet 21. The non-magnetic conductor 20 and the permanent magnet 21 are respectively mounted on the structural frame 11 and the mass block 3. When the mass block 3 moves, the non-magnetic conductor 20 and the permanent magnet 21 move relative to each other, causing the non-magnetic conductor 20 to cut magnetic field lines, thus forming eddy current damping and dissipating energy. Figure 8 As shown, one end of the viscous damper 18 is connected to the structural frame 11, and the other end is connected to the mass block 3. When the mass block 3 moves, it drives the piston rod of the viscous damper 18 to extend and retract, resulting in energy dissipation by the viscous damper 18. Figure 9 As shown, the polymer damper 19 dissipates energy by arranging a viscoelastic damper 22 in the tuned mass damper, which drives the polymer material 23 to shear when the mass block 3 moves.

[0049] like Figure 1 , 2 As shown, the spring limiting component 7 spans and connects the two sets of multi-layer springs 6. This makes the multi-layer springs 6 form a whole, further effectively maintaining the compressed and elongated shape of the spring 8. The two sets of multi-layer springs 6 share a single spring limiting component 7, which can connect multiple sets of multi-layer springs 6 into a whole, further improving structural stability and preventing instability during spring compression and elongation.

[0050] In this embodiment, as Figure 1 As shown, several sets of multi-layered springs 6 surround the mass block 3 in the center. The mass block 3 is located in the center between the multiple sets of multi-layered springs 6, and the multi-layered springs 6 and the mass block 3 are at the same height level, reducing the overall height of the damper. The heavy mass block 3 is located in the center and is constrained to slide up and down by the mass block guide member 4, making the overall center of gravity more stable. However, it is not limited to this embodiment. The multi-layered springs 6 can also be located in the center, and the mass block 3 can be located around the multi-layered springs 6, surrounding the multi-layered springs 6. The mass block 3 can be made of materials with physical mass such as steel, concrete, or liquid. It can be made into a suitable size according to the structural needs. According to the overall structural layout, the structure of the mass block 3 can be set as T-shaped or cross-shaped to make room for other components.

[0051] Example 2

[0052] The difference between Example 2 and Example 1 is as follows:

[0053] See Figures 10 to 15 As shown, a multi-layer spring 6 low-frequency tuned mass damper further includes an auxiliary plate 31 and an auxiliary spring system 32. The auxiliary plate 31 has a recessed platform 33, and an outwardly extending wing plate 34 is provided on the upper edge of the recessed platform 33. The auxiliary spring system 32 is supported under the wing plate 34, and the stiffness system 2 is located on the recessed platform 33. In addition to the rebound force provided by the stiffness system 2, an auxiliary spring system 32 is added to provide a greater rebound force. The stiffness system 2 is set within the recessed platform 33, and the wing plate 34 is located on the upper edge of the recessed platform 33, so that the heights of the auxiliary spring system 32 and the stiffness system 2 can partially overlap. This allows for the addition of a spring buffer without increasing the overall height of the damper, thereby improving the damper's load-bearing capacity.

[0054] The auxiliary spring system 32 includes at least one set of auxiliary spring groups 35. Each auxiliary spring group 35 includes at least two layers of auxiliary springs 36 connected in series. An auxiliary limiting component 37 is provided between adjacent layers of auxiliary springs 36. The structural frame 1 is provided with an auxiliary guide component 38. The auxiliary limiting component 37 slides up and down along the auxiliary guide component 38. The auxiliary spring group 35 adopts the same structure as the multi-layer springs 6 in the stiffness system 2, further improving the stability of the entire damper.

[0055] The sliding mechanism of the auxiliary plate 31 and the auxiliary guide component 38 can be referred to Figure 5 , 6 The sliding engagement between the spring limiting component 7 and the spring guiding component 5 is not described in detail here.

[0056] Example 3

[0057] The difference between Example 3 and Example 1 is as follows:

[0058] In Example 1, as Figure 2 As shown, each multi-layer spring 6 includes three layers of springs 8 connected in series, as in embodiment three. Figure 16 , 17 As shown, each group of multi-layer springs 6 includes four layers of springs 8 connected vertically. A spring limiting component 7 is provided between two adjacent springs 8 in the same group of multi-layer springs 6. In this embodiment, there are a total of four springs 8 and three spring limiting components 7 in the same group of multi-layer springs 6. According to the method of this utility model, the height-to-diameter ratio of each single-layer spring 8 can be reduced to a reasonable range, thereby reducing the overall cross-sectional area of ​​each group of multi-layer springs 6 and ultimately reducing the overall volume.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model, and these will not affect the implementation effect of the present utility model or the practicality of the patent.

Claims

1. A multi-layer spring low-frequency tuned mass damper, characterized in that, include: The structural frame (1) is provided with a mass block guide member (4) and a spring guide member (5); The stiffness system (2) includes at least one set of multi-layer springs (6), each set of multi-layer springs (6) includes at least two layers of springs (8) connected in series, and a spring limiting component (7) is provided between two adjacent layers of springs (8); Mass block (3), said mass block (3) is mounted on mounting plate (9); The multi-layer spring (6) is supported below the mounting plate (9), the spring limiting component (7) slides up and down along the spring guide component (5), and the mounting plate (9) slides up and down along the mass block guide component (4).

2. The multi-layer spring low-frequency tuned mass damper according to claim 1, characterized in that, The end of the spring limiting component (7) is provided with a groove (10), and the spring guide component (5) is inserted into the groove (10).

3. A multi-layer spring low-frequency tuned mass damper according to claim 2, characterized in that, The contact edge between the spring limiting component (7) and the spring guiding component (5) is provided with a rolling pair (25) or a sliding block (26). The spring limiting component (7) slides on the spring guiding component (5) through the rolling pair (25), or the spring limiting component (7) slides on the spring guiding component (5) through the sliding block (26).

4. A multi-layer spring low-frequency tuned mass damper according to claim 1, characterized in that, The mass block guide member (4) is a vertical guide shaft, and the mounting plate (9) is provided with a sliding ring (15), which is sleeved on the mass block guide member (4).

5. A multi-layer spring low-frequency tuned mass damper according to claim 1, characterized in that, A damping system (16) is provided between the mass block (3) and the structural frame (1).

6. A multi-layer spring low-frequency tuned mass damper according to claim 5, characterized in that, The damping system (16) is an eddy current damping (17), or a viscous damping (18), or a polymer damping (19).

7. A multi-layer spring low-frequency tuned mass damper according to claim 1, characterized in that, The spring limiting component (7) spans across the two sets of multi-layer springs (6) and connects the two sets of multi-layer springs (6).

8. A multi-layer spring low-frequency tuned mass damper according to claim 1, characterized in that, Several sets of the multi-layered springs (6) surround the mass block (3) in the center.

9. A multi-layer spring low-frequency tuned mass damper according to any one of claims 1-8, characterized in that, It also includes an auxiliary plate (31) and an auxiliary spring system (32). The auxiliary plate (31) has a recessed platform (33) with an outwardly extending wing plate (34) on the upper edge of the recessed platform (33). The auxiliary spring system (32) is supported under the wing plate (34), and the stiffness system (2) is located on the recessed platform (33).

10. A multi-layer spring low-frequency tuned mass damper according to claim 9, characterized in that, The auxiliary spring system (32) includes at least one set of auxiliary spring groups (35), the auxiliary spring group (35) includes at least two layers of auxiliary springs (36) connected in series, and an auxiliary limiting component (37) is provided between two adjacent layers of the auxiliary springs (36). The structural frame (1) is provided with an auxiliary guide component (38), and the auxiliary limiting component (37) slides up and down along the auxiliary guide component (38).

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