Tuned mass inerter damper for controlling low-frequency vibration
By adopting a series suspension method of multi-stage tensile springs in super-large span bridges, the problem of excessive static deformation of traditional tuning mass dampers in low-frequency vortex-exciting vibration control is solved, and efficient low-frequency vibration control is achieved.
Patent Information
- Application Number
- CN202421747459.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-23
AI Technical Summary
When traditional tuning mass dampers control vortex vibration with frequency below 0.3Hz, the static deformation of the spring is too large, making it difficult to apply to super-span bridges, and a large lever ratio or magnification is required to reduce the vibration frequency, resulting in a reduced vibration control efficiency.
The multi-stage tensile spring series suspension method is adopted to increase the static tensile deformation of the spring in a limited vertical space, and reduce the ratio of the equivalent mass of the inertia capacity to the physical mass of the mass, thereby achieving efficient low-frequency vortex-exciting vibration control.
In a limited space, the static tensile deformation of multi-stage springs is greatly increased, the ratio of inertial capacity equivalent mass to the physical mass of mass is reduced, and the efficiency of low-frequency vortex excitation vibration control is significantly improved.
Smart Images
Figure CN222935827U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of low-frequency vibration control, and relates to a tuned mass inertial damper for controlling low-frequency vibration. Background Technique
[0002] Traditional tuned mass dampers have good control effects on the vibrations of structures such as bridges and buildings, and have been widely used. The main girders of long-span bridges usually adopt truss sections or closed box sections. Truss-section bridges usually do not experience vortex-induced vibrations. However, some steel box girder bridges may experience obvious vortex-induced vibrations due to reasons such as large span, low frequency, light mass, and low damping. There is only a vertical space of 2.5 - 4 m inside the steel box girders of most long-span bridges. When the vibration frequencies of traditional tuned mass dampers are as low as 0.3 Hz and 0.2 Hz, the static deformation amounts of the springs have reached 2.8 m and 6.3 m respectively. Coupled with the original length of the springs and the required vibration space, the allowable static deformation amount of the springs becomes even smaller. Therefore, it is very difficult to apply them to the vortex-induced vibration control with frequencies lower than 0.3 Hz. At this time, a lever-type tuned mass damper or a tuned mass inertial damper can be used to reduce the static deformation amount of the springs. However, for super-long-span bridges, the vortex-induced vibration frequency may be lower than 0.15 Hz, or even lower. At this time, a very large lever ratio or magnification ratio (the ratio of the inertial equivalent mass to the physical mass of the mass block) is required to reduce the vibration frequency of the tuned mass damper, which will greatly reduce the vibration control efficiency. Therefore, it is necessary to develop a super-low-frequency tuned mass inertial damper with a low magnification ratio (the ratio of the inertial equivalent mass to the physical mass of the mass block). Summary of the Utility Model
[0003] The utility model provides a tuned mass inertial damper for controlling low-frequency vibration, which can greatly reduce the ratio of the inertial equivalent mass to the physical mass of the mass block, thereby greatly improving the vibration control efficiency and enhancing its applicability.
[0004] The utility model proposes a multi-stage tensile spring series suspension method, which can greatly increase the static tensile deformation amount of the spring in a limited vertical space, thereby reducing the ratio of the inertial equivalent mass to the physical mass of the mass block, and finally realizing a significant improvement in the low-frequency vortex-induced vibration control efficiency.
[0005] Technical Solution of the Utility Model
[0006] A tuned mass inertia capacitance damper for controlling low-frequency vibration, comprising a first support frame 1, a first tension spring 2, a second support frame 3, a second tension spring 4, a third support frame 5, a third tension spring 6, a fourth support frame 7, a fourth tension spring 8, a mass block 9, an inertia container 10, a damper 11 and a guide rod 12; the upper end of the first tension spring 2 is connected to the first support frame 1, and the lower end is connected to the second support frame 3; the upper end of the second tension spring 4 is connected to the second support frame 3, and the lower end is connected to the third support frame 5; the upper end of the third tension spring 6 is connected to the third support frame 5, and the lower end is connected to the fourth support frame 7; the upper end of the fourth tension spring 8 is connected to the fourth support frame 7, and the lower end is connected to the mass block 9; one end of the inertia container 10 is connected to the mass block 9, and the other end is connected to the first support frame 1; one end of the damper 11 is connected to the mass block 9, and the other end is connected to the first support frame 1; the first support frame 1, the second support frame 3, the third support frame 5 and the fourth support frame 7 are all composed of cross beams and vertical beams, and the four are arranged from outside to inside; the cross section of the first support frame 1 is square, and the cross sections of the second support frame 3, the third support frame 5 and the fourth support frame 7 are "J" shaped; the guide rod 12 sequentially passes through the upper cross beam of the first support frame 1, the second support frame 3, the third support frame 5, the fourth support frame 7 and the center of the mass block 9 from the outside, ensuring that the upper cross beams of the second support frame 3, the third support frame 5, the fourth support frame 7 and the mass block 9 vibrate up and down along the guide rod 12, and at the same time reducing the lateral sway of the second support frame 3, the third support frame 5, the fourth support frame 7 and the mass block 9 relative to the first support frame 1.
[0007] The beneficial effects of the present utility model: By adopting the multi-stage spring series connection form proposed by the present utility model, the static tensile deformation amount of the multi-stage spring can be greatly improved in a limited space, thereby greatly reducing the ratio of the inertia equivalent mass to the physical mass of the mass block, and finally improving the control efficiency of low-frequency vortex-induced vibration. Description of the Drawings
[0008] Figure 1 is a tuned mass inertia capacitance damper for controlling low-frequency vibration;
[0009] Figure 2 is the schematic diagram of the series spring.
[0010] In the figure: 1 first support frame, 2 first tension spring, 3 second support frame, 4 second tension spring, 5 third support frame, 6 third tension spring, 7 fourth support frame, 8 fourth tension spring, 9 mass block, 10 inertia container, 11 damper, 12 guide rod. Detailed Embodiment
[0011] The following combines the technical solutions and the drawings to detail the specific embodiments of the present utility model.
[0012] AsFigure 1 As shown in the figure, a tuned mass inertial damper for controlling low-frequency vibration includes a first support frame 1, a first tension spring 2, a second support frame 3, a second tension spring 4, a third support frame 5, a third tension spring 6, a fourth support frame 7, a fourth tension spring 8, a mass block 9, an inertial container 10, a damper 11, and a guide rod 12. The upper end of the first tension spring 2 is connected to the first support frame 1, and the lower end is connected to the second support frame 3; the upper end of the second tension spring 4 is connected to the second support frame 3, and the lower end is connected to the third support frame 5; the upper end of the third tension spring 6 is connected to the third support frame 5, and the lower end is connected to the fourth support frame 7; the upper end of the fourth tension spring 8 is connected to the fourth support frame 7, and the lower end is connected to the mass block 9; one end of the inertial container 10 is connected to the mass block 9, and the other end is connected to the support frame 1; one end of the damper 11 is connected to the mass block 9, and the other end is connected to the support frame 1; the guide rod 12 passes through the upper beams of the first support frame 1, the second support frame 3, the third support frame 5, the fourth support frame 7, and the center of the mass block 9, which can ensure that the upper beams of the second support frame 3, the third support frame 5, the fourth support frame 7, and the mass block 9 vibrate up and down along the guide rod 12, while reducing the lateral sway of the support frames 3, 5, 7 and the mass block 9. The number of levels of the support frame can be adjusted according to needs. Generally, 3 levels are more appropriate. Too many levels are not conducive to installation, and the more levels there are, the smaller the allowable original length and static tensile length of the spring, so its relative efficiency is lower. If there is only the first support frame 1, it degenerates into a traditional tuned mass inertial damper.
[0013] For the support frames 1, 3, 5, 7, the materials, specific dimensions, and cross-sectional forms are not limited. Usually, they are assembled steel brackets, and sufficient strength, stiffness, and stability need to be ensured.
[0014] For the tension springs 2, 4, 6, 8, the materials, dimensions, and cross-sectional forms are not limited. Ordinary tension springs can be used, or prestressed tension springs with a larger initial tension can be used, which can further reduce the static tensile amount of the spring.
[0015] For the mass block 9, the materials and forms are not limited. Iron blocks, concrete blocks, sand boxes, or water tanks can be used.
[0016] For the inertial container 10, the form is not limited. It is used to provide equivalent mass and can adopt ball screw type, rack and pinion type, belt drive type, etc.
[0017] For the damper 11, the form is not limited. Traditional viscous dampers, barrel-type three-term dampers, eddy current dampers, etc. can be used.
[0018] For the guide rod 12, high-performance low-friction bearings need to be equipped to reduce the friction force as much as possible.
[0019] The first tension spring 2, the second tension spring 4, the third tension spring 6, and the fourth tension spring 8 are essentially in series connection of springs ( Figure 2 ). Let their stiffnesses be k 1 , k 2 , k 3 , k 4 respectively. According to the principle of series connection of springs, the equivalent stiffness can be calculated by 1 / k = 1 / k 1 + 2 / k 2 + 3 / k 3 + 4 / k 4 . In order to ensure that the frequencies of each vibration subsystem are close, the stiffnesses of each spring can be optimized and determined according to the mass of the support frame and the mass of the mass block 9.
[0020] As mentioned above, it is only a preferred embodiment of the present invention, and does not impose any formal limitation on the present invention. Any equivalent changes, modifications or evolutions made by those skilled in the art to the above examples using the technical solutions of the present invention still fall within the scope of the technical solutions of the present invention.
Claims
1. A tuned mass inertia damper for controlling low frequency vibration, characterized in that: The tuned mass inertial damper comprises a first support frame (1), a first tension spring (2), a second support frame (3), a second tension spring (4), a third support frame (5), a third tension spring (6), a fourth support frame (7), a fourth tension spring (8), a mass block (9), an inertial container (10), a damper (11) and a guide rod (12); the first tension spring (2) has an upper end connected to the first support frame (1) and a lower end connected to the second support frame (3); the second tension spring (4) has an upper end connected to the second support frame (3) and a lower end connected to the third support frame (5); the third tension spring (6) has an upper end connected to the third support frame (5) and a lower end connected to the fourth support frame (7); the fourth tension spring (8) has an upper end connected to the fourth support frame (7) and a lower end connected to the mass block (9); one end of the inertial container (10) is connected to the mass block (9) and the other end is connected to the first support frame (1); the damper (11) One end is connected to the mass block (9), and the other end is connected to the first support frame (1); the first support frame (1), the second support frame (3), the third support frame (5) and the fourth support frame (7) are all composed of a crossbeam and a vertical beam, and the four are arranged from the outside to the inside; the cross section of the first support frame (1) is square, and the cross sections of the second support frame (3), the third support frame (5) and the fourth support frame (7) are in the shape of a "J"; the guide rod (12) passes through the crossbeams and the center of the mass block (9) on the first support frame (1), the second support frame (3), the third support frame (5) and the fourth support frame (7) in sequence from the outside, so as to ensure that the crossbeams and the mass block (9) on the second support frame (3), the third support frame (5) and the fourth support frame (7) vibrate up and down along the guide rod (12), and at the same time reduce the lateral shaking of the second support frame (3), the third support frame (5), the fourth support frame (7) and the mass block (9) relative to the first support frame (1).
2. The tuned mass inertia damper for controlling low frequency vibration according to claim 1, characterized in that: The number of support frames is adjusted as needed.
3. The tuned mass inertia damper for controlling low frequency vibration according to claim 1, characterized in that: The mass block (9) is made of an iron block, a concrete block, a sand box or a water tank.
4. The tuned mass inertia damper for controlling low frequency vibration according to claim 1, characterized in that: The inertia container (10) is of ball screw type, gear rack type or transmission belt type.
5. The tuned mass inertia damper for controlling low frequency vibration according to claim 1, characterized in that: The damper (11) is a conventional viscous damper, a barrel-type three-phase damper or an eddy current damper.
6. The tuned mass inertia damper for controlling low frequency vibration according to claim 1, characterized in that: The guide rod (12) is equipped with a bearing to reduce friction as much as possible.