Novel frequency stepless regulation horizontal eddy current tuned mass damper

Abstract

The utility model relates to a novel frequency stepless regulation horizontal eddy current tuned mass damper which comprises an outer frame unit and a mass block unit, the outer frame unit is fixedly connected to a building body, and the mass block unit is hung in the outer frame unit and comprises a base and a mass block. Frequency stepless adjusting devices and damping units are arranged on the two sides of the mass block, the top ends and the bottom ends of the frequency stepless adjusting devices are rotationally connected with a top frame and a base of the outer frame unit respectively, each damping unit comprises a conductor plate and a permanent magnet, the permanent magnets are fixed to the mass block, and the conductor plates are fixed to the outer frame unit; a gap is formed between the conductor plate and the permanent magnet, the moving direction of the mass block is consistent with the wind load direction of the building body, and meanwhile the frequency stepless adjusting device horizontally swings in the wind load direction of the building body. According to the utility model, stepless frequency regulation can be realized, the frequency regulation accuracy is improved, the frequency and damping of a building construction site are easy to regulate, and the vibration reduction effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration reduction of high-rise buildings and prefabricated buildings, and specifically relates to a novel frequency continuously adjustable horizontal eddy current tuned mass damper. Background Art

[0002] High-rise buildings have many advantages in terms of structure, economy and culture. They have high land utilization rate and small floor area, alleviating the dilemma of the gradually decreasing available land resources and playing a crucial role in the urban modernization process. In addition, in addition to meeting the basic safety performance and functional requirements, the structural forms and shapes of high-rise buildings show a trend of diversification, individuation and complexity, posing new challenges to structural design. At the same time, with the continuous innovation of building materials, structural design concepts and construction methods, high-rise buildings are gradually developing towards the direction of light weight and high flexibility. Such structures exhibit characteristics such as low natural frequency and small structural damping of the structure itself and are very sensitive to the action of wind. The wind loads on high-rise buildings mainly include three components: along-wind load, cross-wind load and torque. Coupling effects may occur among the three loads, causing relatively strong wind-induced vibration effects.

[0003] Due to the characteristics of simple construction process, short construction period and beautiful shape, prefabricated building structures are increasingly becoming the mainstream of current buildings, attracting wide attention from the whole society; with the development of society, people's pursuit of excellence in life and strict requirements for the comfort of houses; this means higher requirements for the wind resistance performance of prefabricated buildings.

[0004] At present, high-rise buildings and prefabricated buildings use tuned mass dampers to increase the damping of building structures and reduce structural vibrations. The tuned mass damper is a mechanical device composed of a mass unit, a frequency unit, a support frame unit and a damping unit; it absorbs the vibration energy of the main structure onto the mass block and converts it into other energy forms and dissipates it. Traditional dampers are generally mechanical and hydraulic. Mechanical friction dampers have large starting friction, and hydraulic dampers have oil leakage problems. Eddy current dampers can meet the requirements of high sensitivity and long maintenance life.

[0005] In view of the complexity of high-rise building projects and prefabricated building construction, various factors will cause a deviation between the actual and theoretical values of the building structure (building modal frequency, building structure damping ratio). Using theoretical parameters for the design of the tuned mass damper will result in the vibration reduction effect of the tuned mass damper not reaching the best; when the construction of the main building structure is completed and the design of the tuned mass damper is carried out after on-site testing, it will cause an extension of the construction period of the main building structure and affect the delivery cycle; moreover, there may be a situation where the tuned mass damper cannot be installed later. Therefore, after most of the existing tuned mass dampers are installed on the building structure, it is impossible to simply and effectively adjust the damping and frequency on-site, and the adjustment of the frequency and damping sizes is not accurate, so it may not be possible to achieve the best vibration reduction efficiency; for this reason, it is necessary to design and invent a new type of frequency continuously adjustable horizontal eddy current tuned mass damper. Summary of the Utility Model

[0006] In view of the above problems, the present utility model provides a new type of frequency continuously adjustable horizontal eddy current tuned mass damper with accurate frequency size adjustment, easy adjustment of frequency and damping at the building construction site, and good vibration reduction effect.

[0007] The technical solution adopted by the present utility model to solve the above technical problems is as follows: A new type of frequency continuously adjustable horizontal eddy current tuned mass damper, which includes an outer frame unit and a mass block unit. The outer frame unit is fixedly connected to the building body. The mass block unit is hoisted inside the outer frame unit, and the mass block unit includes a base and a mass block. Frequency continuously adjustable devices and damping units are provided on both sides of the mass block. The top and bottom of the frequency continuously adjustable device are respectively rotationally connected to the top frame of the outer frame unit and the base. The damping unit includes a conductor plate and a permanent magnet. The permanent magnet is fixed on the mass block, the conductor plate is fixed on the outer frame unit, and there is a gap between the conductor plate and the permanent magnet. The moving direction of the mass block is the same as the direction of the wind load on the building body, and the moving direction of the mass block cuts the magnetic induction lines formed by the relative movement of the conductor plate and the permanent magnet in the damping unit. At the same time, the frequency continuously adjustable device swings horizontally along the direction of the wind load on the building body.

[0008] Preferably, each of the frequency continuously adjustable devices includes a gearbox, a pinion gear, and a large gear. Gearbox covers are provided on both the front and rear sides of the gearbox. The pinion gear meshes with the large gear. The large gear is disposed at the center of the second rotating shaft, and both ends of the second rotating shaft are respectively connected to the gearbox covers on the front and rear sides by bearings. Bearing end covers are provided at opposite positions on the two gearbox covers. The pinion gear is connected to an adjusting wrench through a first transmission shaft, and the adjusting wrench is disposed outside the bearing end cover on the same side. Guide rails are provided on both the left and right sides inside the gearbox. A rack is slidably connected to the guide rails. The large gear is disposed between the racks on the left and right sides and meshes with the racks. The top end of the left rack of the adjusting wrench is rotatably connected to a first support seat on the top frame of the outer frame unit through a bearing, and the bottom end of the right rack of the adjusting wrench is rotatably connected to a second support seat on the base through a bearing.

[0009] Preferably, the length between the top end of the left rack of the adjusting wrench and the bottom end of the right rack of the adjusting wrench is the length of the swing rod. When the adjusting wrench rotates clockwise, the left and right racks move relatively closer to shorten the length of the swing rod, and when the adjusting wrench rotates counterclockwise, the left and right racks move relatively farther away to extend the length of the swing rod.

[0010] Preferably, the mass block includes a main mass block and an additional mass block.

[0011] Preferably, the building body is bolted to the outer frame unit through mounting interfaces.

[0012] Preferably, two frequency continuously adjustable devices are provided on each side of the mass block unit, and the permanent magnets on the same side are disposed between the two frequency continuously adjustable devices.

[0013] Preferably, limit rubbers for restricting the movement of the mass block are provided on the outer frame unit.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] 1. The frequency of the present utility model can be adjusted accurately. By rotating the adjusting wrench clockwise and counterclockwise, the length of the horizontal movement swing rod of the tuned mass damper is adjusted, playing a role in continuously adjusting the frequency, so as to accurately adjust the frequency of the tuned mass damper.

[0016] 2. The frequency and damping of the present utility model are easy to adjust at the construction site of the building. By rotating the adjusting wrench to drive the rotation of the first gear and the second gear, the left and right racks are driven to move relatively farther away or relatively closer, so that a force-saving mechanism exists in the whole structure, which is convenient for on-site operation.

[0017] 3. The present utility model has small starting friction and good vibration damping effect. After the present utility model is installed on the building body, the frequency can be conveniently, quickly and accurately adjusted according to the measured data, meeting the requirements of the optimal frequency and the optimal damping ratio, and achieving the best vibration damping performance.

[0018] 3. The present utility model is suitable for working environments that require a long fatigue life and are not easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the installation schematic diagram of the present utility model installed on the building body;

[0020] Figure 2 is the three-dimensional structure schematic diagram of the present utility model;

[0021] Figure 3 is the three-dimensional structure schematic diagram of the present utility model with one side conductor plate removed;

[0022] Figure 4 is the three-dimensional structure schematic diagram of the frequency stepless adjustment device in the present utility model;

[0023] Figure 5 is the internal structure schematic diagram of the frequency stepless adjustment device in the present utility model with the gearbox cover and the bearing end cover removed;

[0024] Figure 6 is the horizontal movement schematic diagram of the present utility model;

[0025] Figure 7 is the principle schematic diagram of the stepless adjustment device in the present utility model, where in Figure a, the adjustment wrench rotates clockwise and in Figure b, the adjustment wrench rotates counterclockwise. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will combine Figure 1-7 to describe the present utility model in detail. Here, the schematic embodiments of the present utility model and the descriptions are used to explain the present utility model, but not to limit the present utility model.

[0027] A new type of frequency stepless adjustment horizontal eddy current tuned mass damper, which includes an outer frame unit 2 and a mass block unit 4. As Figure 1 shown, the outer frame unit is fixedly connected to the building body 1. Specifically, the building body is bolted to the outer frame unit through an installation interface, as Figure 2 and Figure 3As shown, the mass block unit is hoisted inside the outer frame unit, and the mass block unit includes a base 6 and a mass block 5. The mass block specifically includes a main mass block and an additional mass block for adjustment. Frequency continuously adjustable devices 7 and damping units are provided on both sides of the mass block. The top and bottom of the frequency continuously adjustable device are respectively rotatably connected to the top frame of the outer frame unit and the base. The damping unit includes a conductor plate 3 and a permanent magnet 8. The permanent magnet is fixed on the mass block, and the conductor plate is fixed on the outer frame unit. There is a gap between the conductor plate and the permanent magnet. The moving direction of the mass block is the same as the direction of the wind load on the building body, and the moving direction of the mass block cuts the magnetic induction lines formed by the relative movement of the conductor plate and the permanent magnet in the damping unit. At the same time, the frequency continuously adjustable device swings horizontally along the direction of the wind load on the building body.

[0028] As Figure 4 and Figure 5 shown, each frequency continuously adjustable device includes a gearbox 9, a pinion 10 and a large gear 11. Gearbox covers 12 are provided on both the front and back sides of the gearbox. The pinion meshes with the large gear. The large gear is arranged at the center of the second rotating shaft 13, and both ends of the second rotating shaft are respectively connected to the gearbox covers on the front and back sides by bearings. Bearing end caps 14 are provided at opposite positions on the two gearbox covers. The pinion is connected to an adjusting wrench 16 through a first transmission shaft 15. At the same time, the adjusting wrench is arranged outside the bearing end cap on the same side. Guide rails 17 are provided on both the left and right sides inside the gearbox. A rack 18 is slidably connected to the guide rails. The large gear is arranged between the left and right racks and meshes with the racks. The top of the left rack of the adjusting wrench is rotatably connected to a first support seat 21 on the top frame of the outer frame unit through a bearing 20, and the bottom of the right rack of the adjusting wrench is rotatably connected to a second support seat 22 on the base through a bearing.

[0029] The length between the top of the left rack of the adjusting wrench and the bottom of the right rack of the adjusting wrench is the length L of the swing rod. At the same time, the left and right racks move relatively closer by rotating the adjusting wrench clockwise to shorten the length L of the swing rod, and the left and right racks move relatively farther away by rotating the adjusting wrench counterclockwise to extend the length L of the swing rod.

[0030] Two frequency continuously adjustable devices are provided on each side of the mass block unit, and the permanent magnets on the same side are arranged between the two frequency continuously adjustable devices. And a limiting rubber for restricting the movement of the mass block, that is, a limiting rubber for restricting the movement of the oscillator, is provided on the outer frame unit.

[0031] The damping unit in the present utility model adopts the eddy current damping technology, that is, the relative movement between the conductor plate and the permanent magnet is used to control the magnitude of the horizontal damping ratio. When the conductor plate in the local magnetic field cuts the magnetic force lines, eddy currents will be generated in the conductor plate. The eddy currents will interact with the original magnetic field to generate a force that hinders the relative movement between the conductor plate and the magnetic field, converting kinetic energy into heat energy and dissipating it, increasing the damping ratio of the building structure, accelerating the attenuation rate of the vibration amplitude, and achieving the effect of vibration damping. The eddy current tuned mass damper does not rely on mechanical friction for energy consumption, and there is no working fluid, so there is no problem of liquid leakage and sealing. It has the advantages of high reliability, good durability, and reasonable and compact structure. Therefore, it is particularly suitable for working environments that require a long fatigue life and are not easy to maintain.

[0032] The outer frame unit of the present utility model plays an overall supporting role and a role of connecting with the building main body during installation; the mass block unit and the frequency stepless adjustment device (frequency unit) meet the mass ratio parameter and the swing frequency parameter of the tuned mass damper; the damping unit tuned mass damper (TMD) is mainly used to dissipate energy, and by controlling the gap between the conductor plate and the permanent magnet, the damping ratio of the tuned mass damper is controlled; the frequency stepless adjustment device adjusts the length of the horizontal movement swing rod and plays a role of frequency stepless adjustment.

[0033] Formula 1:

[0034]

[0035] Formula 2:

[0036]

[0037] f - The frequency of the tuned mass damper (Hz);

[0038] g - The acceleration due to gravity (m / s 2 );

[0039] l - The length of the swing rod of the tuned mass damper (m);

[0040] i - The gear transmission ratio;

[0041] n 1 - The rotational speed of the first gear;

[0042] n 2 - The rotational speed of the second gear;

[0043] Z 1 - The number of teeth of the first gear;

[0044] Z 2 - The number of teeth of the second gear;

[0045] T 1 - The torque of the first rotating shaft;

[0046] T 2 —— torque of the second rotating shaft;

[0047] In the frequency stepless adjustment device of the present utility model, as shown in the above formula 1, by adjusting the length of the swing rod, the frequency of the tuned mass damper can be adjusted; according to the stepless transmission characteristics of gear transmission, the rack and pinion perform stepless transmission, and the frequency size can be adjusted steplessly. At the same time, there is a first-stage speed reduction transmission between the small gear (the first gear) and the large gear (the second gear); according to formula 2, the wrench is connected to the small gear (the first gear), and the number of teeth Z of the small gear 1 is less than the number of teeth Z of the large gear 2 of the large gear, the transmission ratio i > 1, and the torque T 2 > torque T 1 , so there is a labor-saving mechanism in the whole structure, which is more convenient for on-site operation and adjusting the length of the swing of the tuned mass damper, and adjusting the frequency size of the tuned mass damper.

[0048] As Figure 6 shown, the movement direction of the new type of frequency stepless adjustment horizontal eddy current tuned mass damper is the horizontal movement direction.

[0049] As Figure 7 shown, when the adjustment wrench is rotated clockwise as shown in Figure a, the small gear rotates clockwise, the large gear rotates counterclockwise, the left rack moves downward, the right rack moves upward, the length L of the swing rod decreases, and the frequency of the tuned mass damper increases; when the adjustment wrench is rotated counterclockwise as shown in Figure b, the small gear rotates counterclockwise, the large gear rotates clockwise, the left rack moves upward, the right rack moves downward, the length L of the swing rod increases, and the frequency of the tuned mass damper decreases. Because of the stepless transmission characteristics of gear meshing, the length L of the swing rod can be changed steplessly. In this way, after the tuned mass damper is installed on the building body, according to the measured data, the frequency can be adjusted conveniently, quickly and accurately to meet the requirements of the optimal frequency and the optimal damping ratio, and the best vibration reduction performance can be achieved.

[0050] The technical solutions provided by the embodiments of the present utility model have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation methods of the embodiments of the present utility model. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present utility model; at the same time, for those of ordinary skill in the art, according to the embodiments of the present utility model, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A novel frequency-steplessly adjustable horizontal eddy current tuned mass damper, characterized in that: The invention comprises an outer frame unit (2) and a mass block unit (4), wherein the outer frame unit is fixedly connected to a building body (1), the mass block unit is hoisted inside the outer frame unit and comprises a base (6) and a mass block (5), both sides of the mass block are provided with a frequency stepless adjustment device (7) and a damping unit, the top and bottom ends of the frequency stepless adjustment device are rotatably connected to the top frame and the base of the outer frame unit respectively, the damping unit comprises a conductor plate (3) and a permanent magnet (8), the permanent magnet is fixed to the mass block, the conductor plate is fixed to the outer frame unit, a gap is provided between the conductor plate and the permanent magnet, the movement direction of the mass block is consistent with the direction of wind load on the building body, and the movement direction of the mass block cuts the magnetic flux lines formed by the relative movement of the conductor plate and the permanent magnet in the damping unit, and the frequency stepless adjustment device swings horizontally along the direction of wind load on the building body.

2. According to the novel frequency-steplessly adjustable horizontal eddy current tuned mass damper of claim 1, it is characterized by: Each of the frequency stepless adjustment devices comprises a gear box (9), a pinion (10) and a large gear (11). The gear box is provided with a gear box cover (12) on both the front and rear sides. The pinion is meshed with the large gear. The large gear is arranged at the center of a second rotating shaft (13) and both ends of the second rotating shaft are respectively connected to the bearings of the gear box covers on the front and rear sides. Bearing end covers (14) are arranged at opposite positions on the two gear box covers. The pinion is connected to an adjustment wrench (16) through a first transmission shaft (15). At the same time, the adjustment wrench is arranged outside the bearing end cover on the same side. Guide rails (17) are arranged on both the left and right sides of the gear box. A rack (18) is slidably connected to the guide rail. The large gear is arranged between the racks on the left and right sides and meshed with the racks. The top end of the left rack of the adjustment wrench is rotatably connected to a first support seat (21) on the top frame of the outer frame unit through a bearing (20), and the bottom end of the right rack of the adjustment wrench is rotatably connected to a second support seat (22) on the base through a bearing.

3. The novel frequency-steplessly adjustable horizontal eddy current tuned mass damper according to claim 2 is characterized in that: The length between the top end of the rack on the left side of the adjusting wrench and the bottom end of the rack on the right side of the adjusting wrench is the length of the swing rod. At the same time, the left and right racks are relatively close to each other by rotating the adjusting wrench clockwise to shorten the length of the swing rod, and the left and right racks are relatively far apart by rotating the adjusting wrench counterclockwise to extend the length of the swing rod.

4. According to claim 1, the novel frequency-steplessly adjustable horizontal eddy current tuned mass damper is characterized in that: The mass block includes a main mass block and an additional mass block.

5. According to claim 1, the novel frequency-steplessly adjustable horizontal eddy current tuned mass damper is characterized in that: The building body is bolted to the outer frame unit via a mounting interface.

6. According to claim 1, the novel frequency-steplessly adjustable horizontal eddy current tuned mass damper is characterized in that: Two frequency stepless adjustment devices are arranged on each side of the mass block unit, and the permanent magnet on the same side is arranged between the two frequency stepless adjustment devices.

7. According to claim 1, the novel frequency-steplessly adjustable horizontal eddy current tuned mass damper is characterized by: The outer frame unit is provided with a limiting rubber for limiting the movement of the mass block.

Images