Horizontal multidirectional low-frequency tuning liquid mass damper

Abstract

The present application relates to the technical field of vibration reduction, in particular to a horizontal multidirectional low-frequency tuned liquid mass damper. The horizontal multidirectional low-frequency tuned liquid mass damper comprises a damping liquid container, a mass block and a plurality of obliquely arranged springs. The damping liquid container is used for containing damping liquid and is connected with a structure to be damped; the mass block is arranged in the damping liquid container, and the bottom of the mass block is provided with a plurality of rolling elements; the plurality of springs are arranged in a circumferential direction of the mass block at intervals, and one end of each spring is connected with the mass block and the other end is connected with the inner wall of the damping liquid container, and the connecting end of the spring with the inner wall of the damping liquid container is higher than the connecting end with the mass block. The horizontal multidirectional low-frequency tuned liquid mass damper can solve the problem that the spring-mass system TMD in the prior art is difficult to design for ultra-low frequency springs, and the spring elastic force cannot overcome the friction force at the bottom of the mass block.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration reduction, in particular to a horizontal multidirectional low-frequency tuned liquid mass damper. BACKGROUND

[0002] In recent years, with the use of high-strength lightweight materials, the emergence of new processes and the improvement of construction technology, engineering structures are becoming lighter and more flexible, and the characteristics of small damping and low natural frequency are becoming more and more obvious. In particular, during the construction period of large-span cable-stayed bridges, large cantilever construction, 10MW offshore wind turbine towers and high-rise vibration reduction, horizontal multidirectional low-frequency vibration is easy to occur under external load, which seriously affects the service life and performance of the engineering results. Vibration control has become an important problem.

[0003] Single pendulum type TMD control frequency In the formula, g is the acceleration of gravity, and l is the length of the pendulum. The relationship is shown in Table 1. It can be seen that when the single pendulum type TMD control frequency is as low as 0.1 Hz, the length of the pendulum will reach 24.82 m, which seriously affects the stability of the TMD structure and the installation space. Moreover, the control frequency is applicable to an angle range of ±5°, which is difficult to meet the design requirements for large-stroke TMD. In addition, TMD needs to be arranged with a dedicated damper to dissipate energy.

[0004] The control direction of the spring mass system TMD is single, and it is difficult to design a spring for ultra-low frequency. The spring elastic force cannot overcome the friction force at the bottom of the mass block. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a horizontal multidirectional low-frequency tuned liquid mass damper, which can solve the problems of the spring mass system TMD in the prior art, i.e. it is difficult to design a spring for ultra-low frequency, and the spring elastic force cannot overcome the friction force at the bottom of the mass block.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] On the one hand, the present application provides a horizontal multidirectional low-frequency tuned liquid mass damper, comprising:

[0008] A damping liquid container for containing damping liquid and connected to a structure to be damped;

[0009] A mass block arranged in the damping liquid container, and a plurality of rolling elements arranged at the bottom of the mass block;

[0010] A plurality of springs arranged along the circumference of the mass block, the springs being arranged obliquely, one end of each spring being connected to the mass block and the other end being connected to the inner wall of the damping liquid container, and the connection end of the spring to the inner wall of the damping liquid container being higher than the connection end of the spring to the mass block.

[0011] In some alternatives, the plurality of springs have the same inclination angle, and the connecting end of the spring and the inner wall of the damping liquid container are provided with a height adjusting mechanism for adjusting the height of the connecting end of the spring and the inner wall of the damping liquid container.

[0012] In some alternatives, the height adjusting mechanism comprises:

[0013] A lifting support is arranged in the damping liquid container and vertically moves in the damping liquid container to connect the connecting end of the spring and the inner wall of the damping liquid container.

[0014] A driving member is connected with the lifting support to drive the lifting support to lift.

[0015] In some alternatives, the driving member comprises a support frame, a driving motor and a screw rod. The support frame is arranged at the top of the damping liquid container, the driving motor is arranged above the support frame, the screw rod is vertically arranged and connected with the output end of the driving motor, and a screw rod sleeve is sleeved on the screw rod. The lifting support comprises a plurality of connecting rods corresponding to the springs. One end of the connecting rod is connected with the screw rod sleeve, and the other end is used to connect with the spring.

[0016] In some alternatives, the inner wall of the damping liquid container is provided with a limiting groove corresponding to the connecting rod. The end of the connecting rod connected with the spring extends into the limiting groove and vertically moves in the limiting groove.

[0017] In some alternatives, the connecting rod is connected with the spring through a vertical connecting rod arranged below the connecting rod.

[0018] In some alternatives, further comprising a vibration monitoring mechanism and a control unit. The vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be damped. The control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism and control the driving member to adjust the height of the lifting support according to the vibration frequency.

[0019] In some alternatives, the mass block comprises a mass block container and a counterweight iron sand filled in the mass block container, and the spring is connected in the middle part of the mass block container.

[0020] In some alternatives, the cross section of the mass block container is circular, and the diameter of the middle part of the mass block container is smaller than the diameter of the upper and lower ends.

[0021] In some alternatives, the rolling member is a rolling ball or a universal cow eye wheel.

[0022] Compared with the prior art, the application has the advantages that in the scheme, the spring is arranged to be inclined, so that an upward component force is provided for the mass block, the damping liquid can also provide a buoyancy for the mass block, the vertical buoyancy and the vertical component force of the spring balance the dead weight, the contact pressure of the mass block on the bottom of the damping liquid container is reduced, the bottom friction of the mass block is effectively reduced, and the structure to be damped can be started easily, so that the damping effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0024] Figure 1 A structure schematic diagram of a horizontal multi-directional low-frequency tuning liquid mass damper in the embodiments of the present application;

[0025] Figure 2 A front view structure schematic diagram of a frequency-adjustable mass damper in the embodiments of the present application;

[0026] Figure 3 A top view structure schematic diagram of a frequency-adjustable mass damper in the embodiments of the present application.

[0027] In the drawings, 1 is a damping liquid container, 11 is a barrel body, 12 is a mounting plate, 2 is a mass block, 21 is a mass block container, 22 is a counterweight iron sand, 3 is a rolling member, 4 is a spring, 5 is a height adjusting mechanism, 51 is a lifting support, 511 is a connecting rod, 512 is a vertical connecting rod, 52 is a driving member, 521 is a support frame, 522 is a driving motor, 523 is a screw rod, and 524 is a screw rod sleeve. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort are within the protection scope of the present application.

[0029] The embodiments of the present application will be further described in combination with the drawings.

[0030] As Figure 1As shown, in one aspect, the present application provides a horizontal multi-direction low-frequency tuned liquid mass damper, comprising: a damping liquid container 1, a mass block 2 and a plurality of obliquely arranged springs 4. The damping liquid container 1 is used for containing damping liquid and is connected with a structure to be damped; the mass block 2 is arranged in the damping liquid container 1, and the bottom of the mass block 2 is provided with a plurality of rolling members 3; the plurality of springs 4 are arranged along the circumference of the mass block 2 at intervals, the springs 4 are obliquely arranged, one end of the springs 4 is connected with the mass block 2, and the other end of the springs 4 is connected with the inner wall of the damping liquid container 1, and the connecting end of the springs 4 with the inner wall of the damping liquid container 1 is higher than the connecting end of the springs 4 with the mass block 2.

[0031] In use of the horizontal multi-direction low-frequency tuned liquid mass damper, the damping liquid container 1 is installed on the structure to be damped, damping liquid is contained in the damping liquid container 1, and the mass block 2 is arranged in the damping liquid container 1, the plurality of springs 4 are arranged along the circumference of the mass block 2 at intervals, and the connecting end of the springs 4 with the inner wall of the damping liquid container 1 is higher than the connecting end of the springs 4 with the mass block 2, so that the springs 4 are obliquely arranged. Since the springs 4 are obliquely arranged, upward component force can be provided for the mass block 2, and the damping liquid can also provide buoyancy for the mass block 2, since the vertical buoyancy and the vertical component force of the springs 4 balance the weight, the contact pressure of the mass block 2 on the bottom of the damping liquid container 1 is reduced, the bottom friction of the mass block 2 is effectively reduced, and when the structure to be damped vibrates, it is no longer difficult to start, and the damping effect is effectively achieved.

[0032] The connection of the springs 4 with the inner wall of the damping liquid container 1 can be direct connection or indirect connection through other structures, and here the connection of the springs 4 with the inner wall of the damping liquid container 1 only means that the end of the springs 4 is located at the inner wall of the damping liquid container 1.

[0033] In this example, the plurality of springs 4 are at least three, and are uniformly and evenly arranged along the circumference of the mass block 2, and can play a damping role in all horizontal directions.

[0034] Specifically, the bottom friction F of the mass block 2 f = μF n , in the formula, F f is the rolling friction, μ is the rolling friction coefficient, F n is the bottom pressure of the mass block 2, F n =G-F 浮 -nF N sinθ=G-ρgV 排 -nF N sinθ, in the formula, G is the weight of the mass block, G=mg, m is the total weight of the mass block, g is the acceleration of gravity; F 浮 is the liquid buoyancy, F 浮 =ρgV 排 , ρ is the density of the liquid, V 排 is the volume of the liquid displaced by the mass block. n is the number of springs, and F N为弹簧弹力, F N =kδ, k is spring stiffness, δ is spring elongation, θ is spring oblique angle.

[0035] The self-weight of the mass block 2 is balanced by the liquid buoyancy and the spring vertical force, the contact pressure is reduced, and the friction is reduced, so that the motion of the low-frequency tuned mass damper mass block is realized.

[0036] As shown in Figure 2 and Figure 3 In some optional embodiments, the oblique angles of the plurality of springs 4 are the same, and the connection end of the spring 4 and the inner wall of the damping liquid container 1 is provided through the height adjusting mechanism 5, and the height adjusting mechanism 5 is used to adjust the height of the connection end of the spring 4 and the inner wall of the damping liquid container 1.

[0037] In this embodiment, the connection end of the spring 4 and the inner wall of the damping liquid container 1 is provided through the height adjusting mechanism 5, that is, the spring 4 is indirectly connected to the inner wall of the damping liquid container 1 through the height adjusting mechanism 5, and the height of the connection end of the spring 4 and the inner wall of the damping liquid container 1 is adjusted through the height adjusting mechanism 5, which can drive the angle and elongation of the spring 4, which is equivalent to adjusting the friction at the bottom of the mass block 2, and at the same time adjusting the horizontal stiffness of the spring 4, so as to achieve the purpose of adjusting the vibration frequency.

[0038] In some optional embodiments, the height adjusting mechanism 5 includes a lifting support 51 and a driving member 52. The lifting support 51 is arranged in the damping liquid container 1 and can move vertically in the damping liquid container 1, and is used to connect the connection end of the spring 4 and the inner wall of the damping liquid container 1. The driving member 52 is connected with the lifting support 51 and is used to drive the lifting support 51 to lift.

[0039] In this embodiment, the spring 4 is indirectly connected to the inner wall of the damping liquid container 1 through the lifting support 51 arranged in the damping liquid container 1, and the lifting support 51 can move vertically in the damping liquid container 1, and the height of the connection end of the spring 4 and the lifting support 51 is adjusted through the driving member 52 to drive the lifting support 51 to lift, so as to adjust the angle and elongation of the spring 4, which is equivalent to adjusting the friction at the bottom of the mass block 2, and at the same time adjusting the horizontal stiffness of the spring 4, so as to achieve the purpose of adjusting the vibration frequency.

[0040] In some optional embodiments, the driving member 52 includes a support frame 521, a driving motor 522 and a lead screw 523. The support frame 521 is arranged at the top of the damping liquid container 1, the driving motor 522 is arranged above the support frame 521, the lead screw 523 is vertically arranged and connected with the output end of the driving motor 522, and a lead screw sleeve 524 is sleeved on the lead screw 523. The lifting support 51 includes a plurality of connecting rods 511 corresponding to the springs 4. One end of the connecting rod 511 is connected with the lead screw sleeve 524, and the other end is used to connect with the spring 4.

[0041] In the embodiment, a support frame 521 is arranged on the top of the damping liquid container 1, and a driving motor 522 is arranged above the support frame 521. The output end of the driving motor 522 is connected with a vertically arranged screw rod 523. A screw rod sleeve 524 matched with the screw rod 523 is sleeved on the screw rod 523. The lifting support 51 is connected with the screw rod sleeve 524. The driving motor 522 drives the screw rod 523 to rotate, drives the screw rod sleeve 524 to move vertically on the screw rod 523, drives the lifting support 51 to move vertically, and drives the angle and the elongation of the adjusting spring 4.

[0042] In some optional embodiments, a limiting groove corresponding to the connecting rod 511 is arranged on the inner wall of the damping liquid container 1. The end of the connecting rod 511 connected with the spring 4 is inserted into the limiting groove and moves vertically in the limiting groove.

[0043] In the embodiment, in order to prevent the screw rod sleeve 524 from rotating when the driving motor 522 drives the screw rod 523 to rotate and drives the screw rod sleeve 524 to move vertically on the screw rod 523, the end of the connecting rod 511 connected with the screw rod sleeve 524 is clamped in the limiting groove on the inner wall of the damping liquid container 1. Thus, when the driving motor 522 drives the screw rod 523 to rotate, the screw rod sleeve 524 does not rotate but moves vertically relative to the screw rod 523, thereby driving the end of the connecting rod 511 connected with the spring 4 to move vertically in the limiting groove to adjust the angle and the elongation of the spring 4.

[0044] In some optional embodiments, the connecting rod 511 is connected with the spring 4 through a vertical connecting rod 512 arranged below the connecting rod 511.

[0045] In the embodiment, in order to realize the angle adjustment of the spring 4 between 0 degree and a set angle, a vertical connecting rod 512 is arranged on the lower part of the connecting rod 511, and the lower end of the vertical connecting rod 512 is connected with the spring 4. The vertical connecting rod 512 is located inside the inner wall of the damping liquid container 1 and is arranged vertically. Such design can make the spring 4 be in a horizontal state when the connecting rod 511 of the lifting support 51 descends to the top of the mass block 2. In addition, in order to ensure the stability of the mass block 2 when the spring 4 pulls the mass block 2, the connecting end of the spring 4 and the mass block 2 is located at the middle and lower part of the mass block 2.

[0046] In some optional embodiments, the harmonic liquid mass damper further comprises a vibration monitoring mechanism and a control unit. The vibration monitoring mechanism is used for monitoring the vibration frequency of the structure to be damped. The control unit is used for acquiring the vibration frequency monitored by the vibration monitoring mechanism and controlling the driving member 52 to adjust the height of the lifting support 51 according to the vibration frequency.

[0047] In this example, the height of the connecting end of the spring 4 and the lifting support 51 is adjusted by driving the lifting support 51 by the driving member 52, so as to drive the angle and elongation of the spring 4, adjust the horizontal stiffness of the spring 4, and achieve the purpose of adjusting the vibration frequency. Therefore, a monitoring mechanism is arranged on the structure to be damped, for monitoring the vibration frequency of the structure to be damped, calculating the angle and elongation of the corresponding spring 4 according to the vibration frequency of the structure to be damped, and adjusting the height of the lifting support 51 by the driving member 52.

[0048] In some optional embodiments, the mass block 2 includes a mass block container 21 and a counterweight iron sand 22 filled in the mass block container 21.

[0049] The control frequency design of the harmonic liquid mass damper: K is the stiffness, M is the mass, K=nkcosθ, M=m0+m1+m δ , wherein m0 is the fixed mass of the mass block shell steel structure, m1 is the mass of the iron sand or other materials filled in the mass block cavity, m δ is the additional mass of the liquid, n is the number of springs, and θ is the inclined angle of the spring 4.

[0050] As can be seen from the above control frequency design formula, the control frequency of the damper is also related to the mass of the mass block 2, and the mass of the mass block 2 can be adjusted by adjusting the amount of the counterweight iron sand 22 in the mass block container 21. Therefore, the control frequency can also be adjusted by adjusting the mass of the mass block 2.

[0051] In addition, the mass ratio with the structure to be damped can also be adjusted by adjusting the mass of the mass block 2. When the damper is used for a bridge under construction, when the cantilever is continuously increased, its own mass is also gradually increased. At this time, if the mass of the damper is not changed or the damper is increased, the damping effect will be weakened. When the present scheme is adopted, as the bridge is erected and the cantilever is gradually increased, the counterweight iron sand 22 in the mass block container 21 can be increased to adapt to the erection of the bridge, without the need to replace the damper or increase the damper.

[0052] In some optional embodiments, the cross section of the mass block container 21 is circular, and the diameter of the middle part of the mass block container 21 is smaller than the diameters of the upper and lower ends, and the spring 4 is connected to the middle part of the mass block container 21.

[0053] In this example, to ensure that the spring 4 has sufficient elongation and to minimize the diameter of the damping fluid container 1, the mass block container 21 is designed with a central diameter smaller than the diameters at the top and bottom ends, i.e., the vertical cross-section is "I" shaped. The spring 4 is connected to the central part of the mass block container 21. This ensures the stability of the mass block 2 when it is pulled by the spring 4, ensures that the spring 4 has sufficient elongation, and ensures that the mass block container 21 has a sufficiently large volume. Under the condition that the mass block 2 has the same maximum mass, the area occupied by the mass block 2 is minimized.

[0054] In some alternative embodiments, the rolling element 3 is a rolling ball or a swivel wheel.

[0055] In this example, multiple (more than 3) cylindrical holes are opened at the bottom of the mass block container 21 to insert ball bearings or embed omnidirectional bullseye wheels to reduce the frictional resistance of the mass block 2.

[0056] In addition, in this embodiment, three or more springs 4 are used, which are equally divided along the circumference of the mass block 2. The damping fluid container 1 includes a barrel 11 and a mounting plate 12. The barrel 11 is located above the mounting plate 12 and is connected to each other. The barrel 11 is used to hold the damping fluid, and the mounting plate 12 is used to connect to the structure to be damped.

[0057] In summary, in this scheme, because the spring 4 is tilted, it can provide an upward component force to the mass block 2, and the damping fluid can also provide buoyancy to the mass block 2. Since the vertical buoyancy and the vertical component force of the spring 4 balance the self-weight, the contact pressure of the mass block 2 on the bottom of the damping fluid container 1 is reduced, which can effectively reduce the frictional resistance at the bottom of the mass block 2, so that when the structure to be damped vibrates, it is no longer difficult to start, and it can effectively play the role of vibration reduction.

[0058] The connection between the spring 4 and the inner wall of the damping liquid container 1 is set through the height adjustment mechanism 5. That is, the spring 4 is indirectly connected to the inner wall of the damping liquid container 1 through the height adjustment mechanism 5. By adjusting the height of the connection between the spring 4 and the inner wall of the damping liquid container 1 through the height adjustment mechanism 5, the angle and elongation of the spring 4 can be adjusted, which is equivalent to adjusting the friction at the bottom of the mass block 2, and at the same time adjusting the horizontal stiffness of the spring 4, thereby achieving the purpose of adjusting the vibration frequency.

[0059] The end of the connecting rod 511 connected to the lead screw sleeve 524 is locked in the limiting groove on the inner wall of the damping liquid container 1. In this way, when the drive motor 522 drives the lead screw 523 to rotate, the lead screw sleeve 524 will not rotate, but will only move vertically relative to the lead screw 523, thereby driving the end of the connecting rod 511 connected to the spring 4 to move vertically in the limiting groove, so as to adjust the angle and elongation of the spring 4.

[0060] A vertical connecting rod 512 is arranged at the lower part of the connecting rod 511, and the lower end of the vertical connecting rod 512 is connected with the spring 4. The vertical connecting rod 512 is arranged inside the inner wall of the damping liquid container 1 and vertically. In this way, when the connecting rod 511 of the lifting support 51 is lowered to the top of the mass block 2, the spring 4 is in a horizontal state. In addition, in order to ensure the stability of the mass block 2 when the spring 4 pulls the mass block 2, the connecting end of the spring 4 and the mass block 2 is arranged at the middle and lower part of the mass block 2.

[0061] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0063] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A horizontal multi-directional low-frequency tuned liquid mass damper, characterized in that, include: Damping fluid container (1), which is used to hold damping fluid and is connected to the structure to be damped; A mass block (2) is disposed inside the damping liquid container (1), and a plurality of rolling elements (3) are provided at the bottom of the mass block (2). Multiple springs (4) are spaced apart along the circumference of the mass block (2). The springs (4) are inclined, with one end connected to the mass block (2) and the other end connected to the inner wall of the damping liquid container (1). The connection end of the spring (4) to the inner wall of the damping liquid container (1) is higher than the connection end to the mass block (2). The multiple springs (4) have the same tilt angle, and the connection end between the spring (4) and the inner wall of the damping liquid container (1) is set by a height adjustment mechanism (5). The height adjustment mechanism (5) is used to adjust the height of the connection end between the spring (4) and the inner wall of the damping liquid container (1). The height adjustment mechanism (5) includes: The lifting bracket (51) is located inside the damping liquid container (1) and can move vertically inside the damping liquid container (1). It is used to connect the spring (4) to the inner wall of the damping liquid container (1). A drive unit (52) is connected to the lifting bracket (51) and is used to drive the lifting bracket (51) to rise and fall; The driving component (52) includes: a support frame (521), a drive motor (522), and a lead screw (523). The support frame (521) is located on the top of the damping liquid container (1), the drive motor (522) is located above the support frame (521), the lead screw (523) is vertically arranged and connected to the output end of the drive motor (522), and a lead screw sleeve (524) is sleeved on the lead screw (523). The lifting bracket (51) includes multiple connecting rods (511) corresponding to the spring (4). One end of the connecting rod (511) is connected to the lead screw sleeve (524), and the other end is used to connect to the spring (4).

2. The horizontal multi-directional low-frequency tuned liquid mass damper as described in claim 1, characterized in that, The inner wall of the damping liquid container (1) is provided with a limiting groove corresponding to the connecting rod (511). The end of the connecting rod (511) connected to the spring (4) extends into the limiting groove and moves vertically within the limiting groove.

3. The horizontal multi-directional low-frequency tuned liquid mass damper as described in claim 2, characterized in that, The connecting rod (511) is connected to the spring (4) via a vertical connecting rod (512) located below it.

4. The horizontal multi-directional low-frequency tuned liquid mass damper as described in any one of claims 1-3, characterized in that, It also includes a vibration monitoring mechanism and a control unit. The vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be vibration-damped. The control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism and control the drive (52) to adjust the height of the lifting bracket (51) according to the vibration frequency.

5. The horizontal multi-directional low-frequency tuned liquid mass damper as described in claim 1, characterized in that, The mass block (2) includes a mass block container (21) and counterweight iron sand (22) filled in the mass block container (21), and the spring (4) is connected to the middle of the mass block container (21).

6. The horizontal multi-directional low-frequency tuned liquid mass damper as described in claim 5, characterized in that, The cross-section of the mass block container (21) is circular, and the diameter of the middle part of the mass block container (21) is smaller than the diameter of the upper and lower ends.

7. The horizontal multi-directional low-frequency tuned liquid mass damper as described in claim 1, characterized in that, The rolling element (3) is a rolling ball or a universal bullseye wheel.

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