A tuned mass damper

Abstract

The patent of the present invention relates to the field of damper technology, and specifically to a tuned mass damper. The tuned mass damper includes a mass block, an elastic element, an eddy current damper assembly, a guide assembly and a mounting assembly. The eddy current damper assembly includes a first permanent magnet and a second permanent magnet installed in parallel on a magnet fixing plate, and a conductor plate arranged between the permanent magnets. The conductor plate moves between the permanent magnets to form an overlapping area different from the magnets to achieve the adjustment of the damping size of the eddy current damper assembly. The present invention solves the problems of inconvenient adjustment, poor adjustment accuracy and small adjustment frequency range of the existing tuned mass damper. The elastic element limit ring can be flexibly disassembled and assembled. By setting elastic elements of different numbers and different stiffnesses, the frequency of the tuned mass damper can be adjusted significantly, the structural versatility is increased, and the cost is reduced.

Description

Technical Field

[0001] The invention patent relates to the field of damper technology, and specifically to a tuned mass damper. Background Art

[0002] With the development of science and technology and urban construction, there are more and more high-rise buildings and large-span bridges. The characteristics of such buildings are that although the strength and stiffness can easily meet the design requirements, their own vibration frequency is often relatively low. For example, the natural frequency of a pedestrian bridge is generally around 2Hz, and the excitation frequency generated by people walking is also around 2Hz, which can easily cause bridge resonance, causing serious discomfort and panic to pedestrians, and also damage the structure itself, or even more seriously, pedestrian safety accidents. In addition, by changing the structure and increasing its own natural frequency, the cost is often greatly increased. In addition, some high-rise buildings, tower buildings, etc. will also resonate and swing greatly under the action of wind loads, causing serious discomfort to office workers in the building, and also causing great damage to the building. In response to such problems, adding TMD to achieve vibration reduction in engineering design is a common and effective way.

[0003] Tuned mass damper (TMD), also known as dynamic vibration absorber, is a substructure attached to the main structure, whose natural frequency is close to the natural frequency of the main structure. When the main structure vibrates, the substructure will generate an opposite inertial force to attenuate the vibration of the main structure. Due to the characteristics of its working principle, the parameters of TMD itself are required to be high. If the frequency is not set properly, its effect will be greatly attenuated and may cause greater vibration. There are often some deviations in construction and design in engineering. Therefore, in order to obtain a wider vibration reduction frequency and better energy dissipation, TMD generally needs to be configured with additional damping units for energy dissipation.

[0004] From the perspective of common TMD products, the additional damping units include liquid dampers and eddy current dampers, but the life of liquid dampers is limited due to friction and leakage during operation. Therefore, eddy current dampers are generally used for occasions with frequent use and durability requirements. However, there are several common forms of eddy current damper TMDs on the market: 1) The magnetic field source of the eddy current damper uses anisotropic magnets (such as round, etc.), which is difficult to process and has high costs; 2) The eddy current component is on the side of the TMD mass block, and the conductor plate and one end of the magnet form an eddy current component. Since only part of the magnetic flux lines at one end of the magnet pass through the conductor plate, this method will cause more leakage magnetic flux, affecting the efficiency of the eddy current; 3) In order to achieve adjustable eddy current damping, general products achieve damping adjustment by changing the distance between the conductor and the magnet. Since the change in magnetic field strength changes exponentially with distance, this method of adjusting damping has great uncertainty during actual installation and adjustment, and it is difficult to control the adjustment size. In addition, TMD is a frequency-sensitive product. Due to errors in the construction of vibration-damping structures, there is often an error between the designed natural frequency and the actual natural frequency. In addition, the same engineering project generally has multiple units that require vibration reduction, and different vibration reduction units sometimes have large differences in natural frequencies. However, designing TMDs with different structures often greatly increases the processing and manufacturing costs. Therefore, the design requires that TMD not only has frequency adjustability, but also requires the ability to adjust frequency over a large range. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a tuned mass damper with reliable performance, which solves the problems of inconvenient adjustment and small adjustment frequency range of the prior tuned mass damper.

[0006] The technical solution of the present invention is implemented as follows: a tuned mass damper includes a mass block, an elastic element, an eddy current damper assembly, a guide assembly and a mounting assembly, characterized in that the eddy current damper assembly includes a first permanent magnet and a second permanent magnet installed in parallel on a magnet fixing plate, and a conductor plate arranged between the permanent magnets, and the conductor plate moves between the first and second permanent magnets to form an overlapping area different from the magnets to achieve the adjustment of the damping size of the eddy current damper assembly.

[0007] The tuned mass damper also includes an elastic element limiting ring detachably mounted between the upper and lower connecting plates, and one end of the elastic element is inserted into the elastic element limiting ring for installation; the tuned mass damper achieves frequency adjustment by setting elastic elements of different numbers and different stiffnesses.

[0008] The conductor plate is provided with waist-shaped holes for adjusting the moving distance of the conductor plate.

[0009] Furthermore, the first permanent magnet and the second permanent magnet on the eddy current damper assembly have opposite magnetic poles.

[0010] A magnet pad is arranged between the first and second permanent magnets and the magnet fixing plate, and the magnet pad is made of non-magnetic conductive material or magnetic isolation material.

[0011] Preferably, the gap between the conductor plate and the first and second permanent magnets is set to 2-5 mm.

[0012] The magnet fixing plate is fixed to the connecting plate through the threaded holes on the side.

[0013] A plurality of mass adjustment plates are detachably mounted above the connection plate.

[0014] Preferably, the first and second permanent magnets are neodymium iron boron or ferrite, and the conductor plate material is copper or aluminum.

[0015] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0016] The present invention solves the problems of inconvenient adjustment and small adjustment frequency range of the existing tuned mass damper. By moving the conductor plate between the first and second permanent magnets, an overlapping area different from the magnets is formed to achieve adjustment of the damping size of the eddy current damper assembly. The elastic element limit ring can be flexibly disassembled and installed, and by setting different numbers and different stiffness elastic elements, a large adjustment of the frequency of the tuned mass damper can be achieved. In addition, a plurality of mass adjustment plates that can be easily disassembled and installed are provided, which can easily adjust the mass of the damper, thereby achieving frequency fine-tuning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the position adjustment of the conductor plate of the present invention;

[0019] Figure 3 for Figure 1 Schematic diagram of eddy current damper assembly without magnet backing plate;

[0020] Figure 4 for Figure 1 Schematic diagram of the eddy current damper assembly with a magnet backing plate;

[0021] Figure 5 It is a schematic diagram of the conductor structure of the eddy current damper component;

[0022] Figure 6 This is a schematic diagram of the installation of the magnet fixing plate of the eddy current damper assembly;

[0023] In the figure: 1-mass block, 2-elastic element, 3-eddy current damper assembly, 4-guide assembly, 5-conductor plate, 6-first permanent magnet, 7-second permanent magnet, 8-magnet pad, 9-waist hole, 10-magnet fixing plate, 11-connecting plate, 12-elastic element limiting ring, 13-mass adjustment plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown in FIG. 1 , the present embodiment provides an eddy current tuned mass damper, the damper comprising a mass block 1, an elastic element 2, an eddy current damper assembly 3, a guide assembly 4 and a mounting assembly. The eddy current damper assembly 3 comprises a first permanent magnet 6 and a second permanent magnet 7 mounted on a magnet fixing plate 10. The first permanent magnet 6 and the second permanent magnet 7 are arranged with opposite magnetic poles, the number of the permanent magnets is several pairs, and a conductor plate 5 is arranged in the middle of the permanent magnets, wherein the conductor plate 5 can move in the middle of the permanent magnets, such as Figure 5 The conductor plate 5 is provided with a waist-shaped hole, and the length of the waist-shaped hole is the distance that the conductor plate 5 can move. Figure 2 As shown in FIG. 1 , a different overlapping area with the magnet is formed, thereby achieving the damping size adjustment of the eddy current damper assembly. Figure 4 As shown, a magnet pad 8 is provided between the permanent magnet and the magnet fixing plate 10. The magnet pad 8 is made of non-magnetic material and is used to increase the distance between the magnet and the magnet fixing plate, so that fewer magnetic lines of force are guided to the magnet fixing plate and more magnetic lines of force pass through the conductor plate, thereby improving the efficiency of eddy current. Figure 6 The elastic element limiting ring 12 shown can be flexibly disassembled and assembled, and by setting elastic elements 2 of different numbers and different stiffnesses, the frequency of the tuned mass damper can be greatly adjusted. The magnet fixing plate 10 is fixed to the connecting plate 11 through the side holes. In this embodiment, the gap between the two sides of the conductor plate 5 and the permanent magnet is set to 3mm, which does not affect the eddy current efficiency and also reduces the design, processing and installation difficulty of the TMD. In this embodiment, the permanent magnet used is neodymium iron boron, and the conductor is a pure copper plate. In addition, a mass adjustment plate 13 that can be easily disassembled and assembled is also provided in this embodiment, so that the mass of the damper can be easily adjusted to achieve frequency fine-tuning.

[0026] The implementation principle of the present invention is: the present invention moves the conductor plate 5 between the first and second permanent magnets 6, 7 to form an overlapping area different from the magnets, so as to adjust the damping size of the eddy current damper assembly 3. The elastic element limit ring 12 can be flexibly disassembled and set, and by setting different numbers and different stiffness elastic elements 2, the frequency of the tuned mass damper can be greatly adjusted. In addition, a plurality of mass adjustment plates 13 that can be easily disassembled are provided, which can easily adjust the mass of the damper, thereby achieving frequency fine-tuning.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tuned mass damper, comprising a mass block (1), an elastic element (2), an eddy current damper assembly (3), a guide assembly (4) and a mounting assembly, characterized in that: The eddy current damper assembly (3) comprises a first permanent magnet (6) and a second permanent magnet (7) mounted in parallel on a magnet fixing plate (10), and a conductor plate (5) arranged between the permanent magnets; the conductor plate (5) moves between the first and second permanent magnets (6, 7) to form an overlapping area different from that of the magnets, so as to adjust the damping magnitude of the eddy current damper assembly (3); It also comprises an elastic element limiting ring (12) which is detachably mounted between the upper and lower connecting plates (11); one end of the elastic element (2) is inserted into the elastic element limiting ring (12) for installation; the tuned mass damper achieves frequency adjustment by arranging elastic elements (2) of different numbers and different stiffnesses.

2. The tuned mass damper according to claim 1, characterized in that: The conductor plate (5) is provided with a waist-shaped hole (9) for adjusting the moving distance of the conductor plate (5).

3. The tuned mass damper according to claim 2, characterized in that: The first permanent magnet (6) and the second permanent magnet (7) on the eddy current damper assembly (3) have opposite magnetic poles.

4. The tuned mass damper according to claim 3, characterized in that: A magnet pad (8) is provided between the first and second permanent magnets (6, 7) and the magnet fixing plate (10), and the magnet pad (8) is made of non-magnetic conductive material or magnetic isolation material.

5. The tuned mass damper according to claim 4, characterized in that: The gap between the conductor plate (5) and the first and second permanent magnets (6, 7) is set to 2-5 mm.

6. The tuned mass damper according to claim 5, characterized in that: The magnet fixing plate (10) is fixed to the connecting plate (11) through threaded holes on the side.

7. The tuned mass damper according to claim 6, characterized in that: A plurality of mass adjustment plates (13) are detachably mounted above the connection plate (11).

8. The tuned mass damper according to claim 7, characterized in that: The first and second permanent magnets (6, 7) are neodymium iron boron or ferrite, and the conductor plate (5) is made of copper or aluminum.

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