CN110485788A - A tuned mass damper - Google Patents

Abstract

The patent of the present invention relates to the technical field of dampers, in particular 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, and the eddy current damper assembly includes a first permanent magnet, a second permanent magnet installed in parallel on a magnet fixing plate, and a set In the conductor plate between the permanent magnets, the conductor plate moves between the permanent magnets to form different overlapping areas with the magnets, so as to realize the adjustment of the damping size of the eddy current damper assembly. The 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 installed. By setting elastic elements of different quantities and different rigidities, the frequency of the tuned mass damper can be greatly adjusted, which increases structural versatility and reduces costs.

Description

A tuned mass damper

technical field

The patent of the present invention relates to the technical field of dampers, in particular to a tuned mass damper.

Background technique

With the development of science and technology and urban construction, there are more and more high-rise buildings and long-span bridges. Although the strength and stiffness of such buildings are relatively easy to meet the design requirements, their own vibration frequency is often relatively low. For example, the natural vibration frequency of pedestrian bridges 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 to the structure itself. damage, and even more seriously lead to pedestrian safety accidents. In addition, by changing the structure and improving its own natural frequency, the cost will often be greatly increased. In addition, some high-rise buildings and tower buildings will also resonate and swing greatly under the action of wind load, which will cause serious discomfort to the office workers in the building, and will also cause great damage to the building. . For such problems, it is a common and effective way to increase TMD to achieve vibration reduction in engineering design.

A tuned mass damper (TUNED MASS DAMPER, TMD for short), also known as a dynamic vibration absorber, is a substructure attached to the main structure, and its 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, which attenuates the vibration of the main structure. Due to the characteristic requirements of its working principle, the parameters of TMD itself are relatively high. If the frequency is not set properly, its effect will be greatly attenuated, and at the same time it may cause greater vibration. There are often some deviations in construction and design in engineering, so In order to obtain a wider damping frequency and better energy dissipation, TMD generally needs to configure additional damping units for energy dissipation.

From the perspective of common TMD products, its additional damping units include liquid type dampers and eddy current dampers, etc., but the life of liquid type dampers is limited due to friction and leakage during operation, so for frequent use, Where durability is required, the eddy current damper type is generally used. However, the eddy current damper type TMD on the market has several common forms: 1) The magnetic field source of the eddy current damper adopts a heterosexual magnet (such as a circle, etc.), and the processing of this eddy current damper is difficult and costly ;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. In this way, only part of the magnetic induction line at one end of the magnet passes through the conductor plate, so more magnetic flux leakage will be caused , which affects the efficiency of eddy current; 3) In order to realize adjustable eddy current damping, the general product realizes damping adjustment by changing the distance between the conductor and the magnet. Since the change of the magnetic field strength changes exponentially with the distance, this This way of adjusting the damping has great uncertainty in the 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 and other errors, there are often errors between the design natural frequency and the actual natural frequency, and the same project generally has multiple units that need to be damped. Different vibration-damping units sometimes have natural frequencies. The difference will be relatively large, but the manufacturing cost of designing TMDs with different structures will often increase significantly. Therefore, the design requires TMD not only to have frequency adjustability, but also to be able to adjust the frequency in a wide range.

Contents of the invention

The invention aims at the deficiencies of the prior art, provides a tuned mass damper with reliable performance, and solves the problems of inconvenient adjustment and small adjustment frequency range of the existing tuned mass damper.

The technical solution of the present invention is achieved as follows: a tuned mass damper, including a mass block, an elastic element, an eddy current damper assembly, a guide assembly and a mounting assembly, wherein the eddy current damper assembly includes a parallel installation The first permanent magnet, the second permanent magnet on the magnet fixing plate, and the conductor plate arranged between the permanent magnets, the conductor plate forms an overlapping area different from that of the magnet by moving between the first and second permanent magnets , to realize the adjustment of the damping size of the eddy current damper assembly.

The tuned mass damper also includes an elastic element limit ring detachably installed between the upper and lower connecting plates, and one end of the elastic element is inserted into the elastic element limit ring for installation; the tuned mass damper is installed by setting different The number and different rigidity of the elastic elements realize the adjustment of the frequency.

The conductor plate is provided with a waist-shaped hole for adjusting the moving distance of the conductor plate.

Further, the magnetic poles of the first permanent magnet and the second permanent magnet on the eddy current damper assembly are opposite.

A magnet backing plate is arranged between the first and second permanent magnets and the magnet fixing plate, and the magnet backing plate is made of a non-magnetic conduction material or a magnetic isolation material.

Preferably, the gap between the conductor plate and the first and second permanent magnets is set at 2-5 mm.

The magnet fixing plate is fixed together with the connecting plate through the threaded hole on the side.

A plurality of quality adjustment plates are detachably installed above the connecting plate.

Preferably, the first and second permanent magnets are ferrite boron or ferrite, and the conductor plate material is copper or aluminum.

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

The 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 that of the magnets is formed, so as to realize the adjustment of the damping size of the eddy current damper assembly. The elastic element limiting ring can be flexibly disassembled and installed, and by setting elastic elements of different quantities and different rigidities, the frequency of the tuned mass damper can be greatly adjusted. In addition, a number of quality adjustment plates can be easily disassembled and assembled, and the quality of the damper can be easily adjusted to achieve frequency fine-tuning.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the position adjustment of the conductor plate of the present invention;

Fig. 3 is a schematic diagram of an eddy current damper assembly without a magnet backing plate in Fig. 1;

Fig. 4 is a schematic diagram of an eddy current damper assembly with a magnet backing plate in Fig. 1;

Fig. 5 is a schematic diagram of the conductor structure of the eddy current damper assembly;

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

In the figure: 1-mass block, 2-elastic element, 3-eddy current damper assembly, 4-guiding assembly, 5-conductor plate, 6-first permanent magnet, 7-second permanent magnet, 8-magnet backing plate , 9-waist hole, 10-magnet fixing plate, 11-connecting plate, 12-elastic element limit ring, 13-quality adjusting plate.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Fig. 1, Fig. 2 and Fig. 3, the present embodiment provides an eddy current tuned mass damper, the damper includes a mass block 1, an elastic element 2, an eddy current damper assembly 3, a guide assembly 4 and Install components. The eddy current damper assembly 3 includes 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 oppositely for the magnetic poles, the quantity of the permanent magnets has several pairs, and the conductor plate 5 arranged in the middle of the permanent magnets, wherein the conductor plate 5 can move in the middle of the permanent magnets, as shown in Figure 5 It is shown that 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. As shown in Figure 2, it forms an overlapping area different from that of the magnet, thereby realizing the damping size of the eddy current damper assembly. adjust. As shown in Figure 4, be to be provided with magnet backing plate 8 between permanent magnet and magnet fixing plate 10, magnet backing plate 8 is non-magnetic conduction material, is used for increasing the distance between magnet and magnet fixing plate, thereby allows less The magnetic field lines are guided to the magnet fixing plate, allowing more magnetic field lines to pass through the conductor plate, thereby improving the efficiency of the eddy current. The elastic element limiting ring 12 shown in FIG. 6 can be flexibly disassembled, and the frequency of the tuned mass damper can be greatly adjusted by setting elastic elements 2 of different numbers and different stiffnesses. The magnet fixing plate 10 is fixed together with 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 3 mm, which does not affect the eddy current efficiency, and also reduces the difficulty of designing, processing and installing the TMD. In this embodiment, the permanent magnet used is NdFeB, and the conductor is pure copper plate. In addition, in this embodiment, a mass adjustment plate 13 is provided, which can be easily disassembled and assembled, so that the mass of the damper can be easily adjusted to realize frequency fine-tuning.

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

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (9)

1. A tuned mass damper, comprising mass block (1), elastic element (2), eddy current damper assembly (3), guide assembly (4) and mounting assembly, is characterized in that, described eddy current damper The assembly (3) includes a first permanent magnet (6), a second permanent magnet (7) installed in parallel on the magnet fixing plate (10), and a conductor plate (5) arranged between the permanent magnets, the conductor plate (5) By moving between the first and second permanent magnets (6, 7), an overlapping area different from that of the magnets is formed, so as to realize the adjustment of the damping size of the eddy current damper assembly (3). 2. The tuned mass damper according to claim 1, characterized in that: it also includes an elastic element stop ring (12) detachably installed between the upper and lower connecting plates (11), one end of the elastic element (2) Insert the elastic element limit ring (12) for installation; the tuned mass damper realizes frequency adjustment by setting elastic elements (2) of different numbers and different stiffnesses. 3. The tuned mass damper according to claim 1 or 2, 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). 4. The tuned mass damper according to claim 3, characterized in that: the magnetic poles of the first permanent magnet (6) and the second permanent magnet (7) on the eddy current damper assembly (3) are opposite. 5. The tuned mass damper according to claim 4, characterized in that: a magnet backing plate (8) is arranged between the first and second permanent magnets (6, 7) and the magnet fixing plate (10), so that The magnet backing plate (8) is a non-magnetic material or a magnetic isolation material. 6. The tuned mass damper according to claim 5, characterized in that: the gap between the conductor plate (5) and the first and second permanent magnets (6, 7) is set to 2-5mm. 7. The tuned mass damper according to claim 6, characterized in that the magnet fixing plate (10) is fixed together with the connecting plate (11) through a threaded hole on the side. 8. The tuned mass damper according to claim 7, characterized in that a plurality of mass adjustment plates (13) are detachably mounted above the connecting plate (11). 9. The tuned mass damper according to claim 8, characterized in that: the first and second permanent magnets (6, 7) are RuFeB or ferrite, and the material of the conductor plate (5) is copper or aluminum.