Passive variable stiffness tuned mass damper and three-dimensional vibration reduction device

Abstract

The utility model discloses a passive variable-rigidity tuned mass damper and a three-dimensional vibration damping device. The passive variable-rigidity tuned mass damper comprises an upper vibration damping and energy dissipation assembly, a lower vibration damping and energy dissipation assembly and a bottom plate, and the upper vibration damping and energy dissipation assembly comprises an upper box body containing liquid; the lower vibration attenuation and energy dissipation assembly comprises a damper shell, and a shell inner cavity of the damper shell is filled with damping liquid; a center rod is arranged in the middle of the lower surface of the upper box; a plurality of variable-rigidity elastic modules are arranged between the upper box body and the bottom plate, an inner base is fixedly installed at the bottom of an inner cavity of the damper shell, a rotating platform is rotationally installed at the upper end of the inner base through a bearing, and the lower end of the center rod and the rotating platform jointly form a spiral transmission pair structure; a plurality of energy consumption plates are fastened to the upper end of the rotating platform. By means of the structural design, the passive variable stiffness tuned mass damper and the three-dimensional vibration reduction device have the advantages of being novel in structural design and good in vibration reduction and energy consumption effect.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration control devices, in particular to a passive variable stiffness tuned mass damper and a three-dimensional vibration reduction device. Background Art

[0002] Traditional tuned mass dampers (TMDs) are typically designed for a specific single frequency or narrow frequency band. Their core principle is to precisely tune the mass, spring, and damper parameters to resonate with the structure at the target frequency, thereby absorbing vibration energy and achieving a vibration reduction effect. However, due to their heavy reliance on frequency matching, in practical applications, the frequency of the external excitation often fluctuates due to environmental conditions (such as wind speed variations and seismic wave characteristics). Once the external excitation frequency deviates from the TMD's tuning frequency, its vibration reduction effect is significantly reduced, and it may even lose its function. Consequently, this strong reliance on frequency matching limits the effectiveness of TMDs in environments with large frequency variations.

[0003] Among them, the Chinese utility model patent with patent number: ZL201922390276.6 and patent name: New liquid tuned mass damper, actually discloses a variable stiffness tuned mass damper; specifically, the new liquid tuned mass damper discloses the following technical solutions: a new liquid tuned mass damper, including a mass block, a liquid energy dissipation device, and a damping device, the bottom of the mass block is fixedly connected to a cubic stiffness nonlinear spring, and the end of the cubic stiffness nonlinear spring away from the mass block is fixedly connected to a steel plate base; the liquid energy dissipation device includes liquid, a baffle and a metal spoiler net, a baffle is provided around the top of the mass block, the inside of the baffle is filled with liquid, and the inner wall of the baffle is fixedly connected to a metal spoiler net; the damping device includes a damping rod and a damping cylinder filled with damping liquid, the damping rod is arranged at the bottom of the mass block, and the damping rod extends into the damping cylinder.

[0004] It should be pointed out that when the above-mentioned new liquid tuned mass damper is working, the actual stiffness of the cubic stiffness nonlinear spring is related to its deformation. During the vibration process, the cubic stiffness nonlinear spring is continuously stretched and compressed, and the stiffness also changes. The frequency of the tuned mass damper also changes within a wide frequency band, so that it has a certain vibration reduction effect on the vibration within the wide frequency band; the damping rod moves up and down in the damping cylinder, and a relative velocity is generated between it and the damping liquid, and then a damping force is generated; during vibration, the liquid itself shakes, and the liquid will pass through the metal spoiler net to provide a certain amount of additional damping, thereby enhancing its vibration reduction effect.

[0005] However, the above-mentioned new liquid tuned mass damper still has the following defects. Specifically, when vibration occurs, the damping rod moves up and down in the damping cylinder and acts on the damping fluid, thereby generating a damping force. Since the contact area between the damping rod and the damping fluid is very limited, and there is only an up and down relative speed between the damping rod and the damping fluid, the damping force that can be generated is also very limited, and the vibration reduction efficiency is not high. Utility Model Content

[0006] The purpose of the utility model is to provide a passive variable stiffness tuned mass damper to address the deficiencies of the prior art. The passive variable stiffness tuned mass damper has a novel structural design and good vibration reduction effect.

[0007] Another object of the present invention is to provide a three-dimensional vibration reduction device to address the deficiencies in the prior art. The three-dimensional vibration reduction device has a novel structural design and a good vibration reduction effect.

[0008] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0009] A passive variable stiffness tuned mass damper comprises an upper vibration-damping and energy-dissipating component, a lower vibration-damping and energy-dissipating component and a bottom plate arranged in sequence from top to bottom, wherein the upper vibration-damping and energy-dissipating component comprises an upper box body, wherein the inner cavity of the upper box body contains liquid;

[0010] The lower vibration reduction and energy dissipation component includes a damper housing fastened to the base plate, wherein the inner cavity of the damper housing is filled with damping fluid;

[0011] A central rod extending vertically downward is installed at the middle position of the lower surface of the upper box body, and the lower end of the central rod extends into the inner cavity of the damper housing;

[0012] A plurality of variable stiffness elastic modules are installed between the upper box and the bottom plate. The modules are distributed in a circular array around the lower vibration reduction and energy dissipation components. The upper end of each variable stiffness elastic module is connected to the upper box, and the lower end of each variable stiffness spring module is connected to the bottom plate.

[0013] An internal base is fixedly mounted on the bottom of the inner cavity of the damper housing, a rotating platform is rotatably mounted on the upper end of the internal base through a bearing, the lower end of the center rod is connected to the rotating platform, and the lower end of the center rod and the rotating platform together form a spiral transmission pair structure;

[0014] A plurality of energy-consuming plates are fastened to the upper end of the rotating platform. The plates are distributed in a circular array around the central rod and extend into the damping fluid respectively. The energy-consuming plates are arranged vertically.

[0015] Among them, a number of butterfly springs are installed between the upper box body and the damper housing, which are distributed in a circular array around the center rod. The upper end of each butterfly spring is respectively connected to the bottom of the upper box body, and the lower end of each butterfly spring is respectively connected to the upper end of the damper housing.

[0016] The upper end of the center rod is rotatably mounted on the axis center position of the lower surface of the upper box body through a bearing, and a ball screw portion is provided on the upper end of the center rod. The ball screw portion of the center rod is sleeved with a screw nut. The screw nut and the ball screw portion of the center rod together form a screw transmission pair.

[0017] A connecting piece is fastened and installed in the middle of each butterfly spring, and the screw rod and nut pieces are connected to the connecting piece of each butterfly spring through a rubber piece.

[0018] The top surface of the inner cavity of the box is provided with an upper mass block, and the bottom surface of the inner cavity of the box is provided with a lower mass block. The lower surface of the upper mass block and the upper surface of the lower mass block are both wavy curved surfaces.

[0019] The upper mass block is in a "cross" shape, and a guide rail in a "cross" shape and vertically aligned with the upper mass block is fastened to the bottom surface of the inner cavity of the box;

[0020] The inner cavity of the box body is provided with a plurality of lower mass blocks, which are slidably mounted on the guide rails.

[0021] Wherein, the upper mass block is provided with an elastic pin at a concave position of the wavy curved surface, and the elastic pin protrudes from the lower surface of the upper mass block;

[0022] When the lower mass block passes through a position below the elastic pin rod, the lower end portion of the elastic pin rod abuts against the upper surface of the lower mass block.

[0023] Wherein, the upper box body is respectively equipped with an upper limiter corresponding to each of the variable stiffness spring modules, and the upper end of each variable stiffness spring module is respectively limited and installed on the upper limiter;

[0024] The bottom plate is respectively provided with lower limiters corresponding to each variable stiffness spring module, and the lower end of each variable stiffness spring module is respectively limitedly installed on the lower limiter.

[0025] The upper end portion of the damper housing is provided with a top through hole for the central rod to pass through, and an oil seal is installed between the interior of the top through hole and the central rod.

[0026] Wherein, each of the energy-consuming plates is provided with hourglass-shaped holes that are evenly spaced.

[0027] A three-dimensional vibration reduction device comprises the above-mentioned passive variable stiffness tuned mass damper.

[0028] Compared with the prior art, the present invention has the following beneficial effects, specifically: in the process of realizing energy consumption and vibration reduction by the present invention, the up and down vibration action of the upper box body will be transmitted to the center rod, thereby causing the center rod to vibrate up and down synchronously with the upper box body. In this process, since the lower end of the center rod and the rotating platform together form a spiral transmission substructure, the center rod with the up and down vibration action will drive the rotating platform to rotate, and the rotating platform with the rotating action will drive each energy consumption plate to rotate synchronously, and each energy consumption plate will stir the damping fluid in the inner cavity of the outer shell, thereby generating a damping force and playing an energy consumption role to reduce vibration; therefore, compared with the prior art, the passive variable stiffness tuned mass damper of the present invention has the advantages of novel structural design and good vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0030] Figure 1 It is a structural diagram of the present utility model.

[0031] Figure 2 It is a schematic diagram of the local structure of the utility model.

[0032] exist Figure 1 and Figure 2 These include:

[0033] 1-Upper vibration-damping and energy-absorbing assembly; 11-Upper housing; 111-Inner cavity of housing; 12-Upper mass block; 13-Lower mass block; 14-Guide rail; 15-Elastic pin; 2-Lower vibration-damping and energy-absorbing assembly; 21-Damper housing; 211-Inner cavity of housing; 22-Inner base; 23-Rotating platform; 24-Energy-absorbing plate; 241-Hourglass-shaped hole; 3-Base plate; 4-Center rod; 41-Ball screw part; 5-Variable stiffness spring module; 6-Butterfly spring; 71-Screw nut; 72-Connecting piece; 73-Rubber part; 81-Upper limiter; 82-Lower limiter; 9-Oil seal. DETAILED DESCRIPTION

[0034] The present invention will be described below in conjunction with specific implementation methods.

[0035] Example 1, as Figure 1 As shown, a passive variable stiffness tuned mass damper includes an upper vibration-damping and energy-absorbing component 1, a lower vibration-damping and energy-absorbing component 2 and a base plate 3 arranged in sequence from top to bottom. The upper vibration-damping and energy-absorbing component 1 includes an upper box body 11, and the inner cavity 111 of the upper box body 11 is filled with liquid.

[0036] Among them, such as Figure 1As shown, the lower vibration reduction and energy dissipation component 2 includes a damper housing 21 fastened to the base plate 3 , and a housing inner cavity 211 of the damper housing 21 is filled with damping fluid; the damping fluid may be silicone oil.

[0037] Also, if Figure 1 As shown, a center rod 4 extending vertically downward is installed at the middle position of the lower surface of the upper box body 11 , and the lower end of the center rod 4 extends into the housing cavity 211 of the damper housing 21 .

[0038] Further, such as Figure 1 As shown, a plurality of variable-rigidity elastic modules are installed between the upper housing 11 and the bottom plate 3 in a circular array, distributed around the lower vibration-damping and energy-dissipating assembly 2. The upper end of each variable-rigidity elastic module is connected to the upper housing 11, and the lower end of each variable-rigidity spring module 5 is connected to the bottom plate 3. The variable-rigidity elastic modules of this first embodiment are still conventional technology and will not be described in detail here.

[0039] Furthermore, Figure 1 As shown, an internal base 22 is securely mounted to the bottom of the inner cavity 211 of the damper housing 21. A rotating platform 23 is rotatably mounted on the upper end of the internal base 22 via a bearing. The lower end of the center rod 4 is connected to the rotating platform 23, and together, the lower end of the center rod 4 and the rotating platform 23 form a helical transmission structure. It should be noted that the internal base 22 can be a rubber base structure, and the core of the internal base 22 defines an upwardly opening airtight cavity into which the lower end of the center rod 4 is inserted for lifting and lowering. The purpose of the airtight cavity is to provide airtight space for the center rod 4 to prevent interference.

[0040] In addition, if Figure 1 As shown, a plurality of energy-consuming plates 24 are fastened to the upper end of the rotating platform 23 , which are distributed in a circular array around the central rod 4 and extend into the damping fluid respectively. Each energy-consuming plate 24 is arranged vertically.

[0041] In the process of realizing energy dissipation and vibration reduction by the passive variable stiffness tuned mass damper of the first embodiment, the up and down vibration movement of the upper housing 11 is transmitted to the center rod 4, thereby causing the center rod 4 to vibrate up and down synchronously with the upper housing 11. In this process, since the lower end of the center rod 4 and the rotating platform 23 together form a spiral transmission substructure, the up and down vibrating center rod 4 will drive the rotating platform 23 to rotate, and the rotating platform 23 will drive each energy dissipation plate 24 to rotate synchronously. Each energy dissipation plate 24 stirs the damping fluid in the inner cavity 211 of the shell, thereby generating a damping force and playing an energy dissipation role to reduce vibration. In addition, since the lower end of the center rod 4 also extends into the damping fluid, there will also be a damping force between the lower end of the up and down vibrating center rod 4 and the damping fluid, that is, it will also produce a vibration reduction and energy dissipation effect.

[0042] For the upper vibration-damping and energy-absorbing component 1 of the first embodiment, the liquid in the inner cavity 111 of the upper box body 11 will shake when vibrating, and the shaking of the liquid will generate a damping force, thereby achieving the effect of reducing vibration.

[0043] It should be pointed out that for several variable stiffness elastic components installed between the upper box 11 and the damper housing 21, they can passively adjust their stiffness according to the magnitude of the vibration, that is, they can adaptively adjust their stiffness according to changes in the vibration frequency, thereby significantly improving the robustness and adaptability of vibration reduction.

[0044] In summary, it can be seen that, compared with the prior art, the passive variable stiffness tuned mass damper of the first embodiment has the advantages of novel structural design and good vibration reduction effect through the above structural design.

[0045] Example 2, as Figure 2 As shown, the difference between this embodiment 2 and embodiment 1 is that a plurality of butterfly springs 6 are installed between the upper box body 11 and the damper housing 21 and are distributed in a circular array around the center rod 4. The upper end of each butterfly spring 6 is respectively connected to the bottom of the upper box body 11, and the lower end of each butterfly spring 6 is respectively connected to the upper end of the damper housing 21.

[0046] For the several butterfly springs 6 of the second embodiment, when the upper box body 11 vibrates up and down, the butterfly springs 6 can consume part of the vibration energy through their own elastic deformation, so as to further improve the vibration reduction and energy dissipation effect.

[0047] Example 3, as Figure 1 As shown, the difference between this embodiment three and embodiment two is that the upper end of the center rod 4 is rotatably mounted on the axial position of the lower surface of the upper box body 11 through a bearing, and the upper end of the center rod 4 is provided with a ball screw portion 41, and the ball screw portion 41 of the center rod 4 is fitted with a screw nut member 71, and the screw nut member 71 and the ball screw portion 41 of the center rod 4 together constitute a screw transmission pair.

[0048] A connecting piece 72 is fastened to the middle of each butterfly spring 6 , and the screw nut piece 71 is connected to the connecting piece 72 of each butterfly spring 6 through a rubber piece 73 .

[0049] For the passive variable stiffness tuned mass damper of the second embodiment, when the vibration amplitude is too large, each disc spring can provide positive stiffness, and the elastic deformation of the disc spring 6 will cause the connecting member 72 to move up and down. The connecting member 72 that moves up and down will pull the screw nut member 71 through the rubber member 73, thereby causing a displacement difference between the screw nut member 71 and the ball screw portion 41 of the center rod 4. The displacement difference will cause the center rod 4 to rotate, and the rotating center rod 4 will further accelerate the rotation of the rotating platform 23, thereby increasing the damping effect between the energy dissipation plate 24 and the damping fluid, so as to achieve the effect of amplifying the damping force.

[0050] Example 4, as Figure 1 As shown, the difference between this embodiment 4 and embodiment 1 is that an upper mass block 12 is installed on the top surface of the box body cavity 111, and a lower mass block 13 is installed on the bottom surface of the box body cavity 111, and the lower surface of the upper mass block 12 and the upper surface of the lower mass block 13 are wavy curved surfaces respectively.

[0051] When the upper box body 11 vibrates and causes the liquid in the box body cavity 111 to shake, the wavy surfaces of the upper mass block 12 and the lower mass block 13 can further promote the shaking of the liquid in the box body cavity 111, thereby further improving the vibration reduction and energy consumption effect.

[0052] Example 5, as Figure 1 As shown, the difference between this embodiment 4 and embodiment 4 is that the upper mass block 12 is in a "cross" shape, and a guide rail 14 in a "cross" shape and vertically aligned with the upper mass block 12 is fastened to the bottom surface of the inner cavity 111 of the box.

[0053] A plurality of lower mass blocks 13 are provided in the inner cavity 111 of the box body. The lower mass blocks 13 are slidably mounted on the guide rails 14 .

[0054] It should be noted that a limiting slope is provided at the connection between the bottom surface and the side wall of the inner cavity 111 of the box body, and the limiting slope is located on the peripheral side of the guide rail 14; the function of the limiting slope is to limit the lower mass block 13 to prevent the lower mass block 13 from falling off the guide rail 14.

[0055] When the upper box body 11 vibrates, the lower mass block 13 moves along the guide rail 14 , and a damping force is generated between the moving lower mass block 13 and the liquid, thereby further improving the vibration reduction and energy dissipation effect.

[0056] Example 6: Figure 1 As shown, the difference between the sixth embodiment and the fifth embodiment is that an elastic pin 15 is installed at the concave position of the wavy surface of the upper mass block 12 , and the elastic pin 15 protrudes from the lower surface of the upper mass block 12 .

[0057] It should be noted that when the lower mass block 13 passes below the elastic pin 15 , the lower end of the elastic pin 15 abuts against the upper surface of the lower mass block 13 .

[0058] When the upper box 11 vibrates, the lower mass block 13 moves along the guide rail 14. During this relative movement, the lower mass block 13 acts on the elastic pin 15 of the upper mass block 12 through its wavy surface, thereby causing the elastic pin 15 to elastically expand and contract and deform, thereby further improving the vibration reduction and energy dissipation effect.

[0059] Example 7, as Figure 1 As shown, the difference between the seventh embodiment and the first embodiment is that the upper box 11 is respectively equipped with an upper limiter 81 corresponding to each variable stiffness spring module 5 , and the upper end of each variable stiffness spring module 5 is respectively limited and installed on the upper limiter 81 .

[0060] The bottom plate 3 is provided with lower limiters 82 corresponding to the variable stiffness spring modules 5 , and the lower end of each variable stiffness spring module 5 is respectively limited and installed on the lower limiters 82 .

[0061] By means of the upper limiter 81 and the lower limiter 82 , the seventh embodiment can ensure that the variable stiffness spring module 5 is stably and reliably installed between the upper box 11 and the bottom plate 3 .

[0062] Example eight, as Figure 1 As shown, the difference between the eighth embodiment and the first embodiment is that a top through hole is provided at the upper end of the damper housing 21 for the center rod 4 to pass through, and an oil seal 9 is installed between the inside of the top through hole and the center rod 4.

[0063] Since the damper housing 21 contains damping fluid in its inner cavity 211 , the oil seal 9 structure of the eighth embodiment can achieve sealing between the center rod 4 and the rotating platform 23 to prevent the damping fluid from leaking when the rotating platform 23 drives the energy-absorbing plate 24 to rotate.

[0064] Example 9, as Figure 1 As shown, the difference between the ninth embodiment and the first embodiment is that each energy dissipation plate 24 is provided with hourglass-shaped holes 241 evenly spaced apart. The hourglass-shaped holes 241 on the energy dissipation plate 24 are staggered and arranged in reverse. This structural design can further amplify the damping force.

[0065] The tenth embodiment is a three-dimensional vibration reduction device, which includes the above-mentioned passive variable stiffness tuned mass damper.

[0066] Since the above-mentioned passive variable stiffness tuned mass damper has the advantages of novel structural design and good vibration reduction effect, correspondingly, the three-dimensional vibration reduction device also has the advantages of novel structural design and good vibration reduction effect.

[0067] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A passive variable stiffness tuned mass damper, comprising an upper vibration-damping energy-dissipating component (1), a lower vibration-damping energy-dissipating component (2), and a bottom plate (3) arranged in sequence from top to bottom, wherein the upper vibration-damping energy-dissipating component (1) comprises an upper box (11), and a liquid is contained in an inner cavity (111) of the upper box (11); The lower vibration-damping energy-dissipating component (2) includes a damper housing (21) fixedly mounted on the base plate (3), and a damping fluid is contained in an inner cavity (211) of the damper housing (21); A center rod (4) extending vertically downward is installed at the middle position of the lower surface of the upper box body (11), and the lower end of the center rod (4) extends into the housing inner cavity (211) of the damper housing (21); A plurality of variable stiffness elastic modules are installed between the upper box (11) and the bottom plate (3) and are distributed in a circular array around the lower vibration-damping energy-absorbing component (2). The upper end of each variable stiffness elastic module is connected to the upper box (11), and the lower end of each variable stiffness spring module (5) is connected to the bottom plate (3). Its characteristics are: An internal base (22) is fixedly mounted on the bottom of the inner cavity (211) of the damper housing (21); a rotating platform (23) is rotatably mounted on the upper end of the internal base (22) via a bearing; the lower end of the center rod (4) is connected to the rotating platform (23); and the lower end of the center rod (4) and the rotating platform (23) together form a spiral transmission substructure; A plurality of energy-consuming plates (24) are fastened to the upper end of the rotating platform (23) and are distributed in a circular array around the central rod (4) and extend into the interior of the damping fluid. The energy-consuming plates (24) are arranged vertically.

2. A passive variable stiffness tuned mass damper according to claim 1, characterized in that: A plurality of butterfly springs (6) are installed between the upper box (11) and the damper housing (21) and are distributed in a circular array around the central rod (4). The upper end of each butterfly spring (6) is connected to the bottom of the upper box (11), and the lower end of each butterfly spring (6) is connected to the upper end of the damper housing (21).

3. The passive variable stiffness tuned mass damper according to claim 2, characterized in that: The upper end of the center rod (4) is rotatably mounted on the axis center position of the lower surface of the upper box (11) through a bearing, and a ball screw portion (41) is provided on the upper end of the center rod (4). The ball screw portion (41) of the center rod (4) is sleeved with a screw nut member (71). The screw nut member (71) and the ball screw portion (41) of the center rod (4) together form a screw transmission pair. A connecting piece (72) is fastened to the middle of each butterfly spring (6), and the screw nut piece (71) is connected to the connecting piece (72) of each butterfly spring (6) through a rubber piece (73).

4. The passive variable stiffness tuned mass damper according to claim 1, characterized in that: An upper mass block (12) is installed on the top surface of the box inner cavity (111), and a lower mass block (13) is installed on the bottom surface of the box inner cavity (111). The lower surface of the upper mass block (12) and the upper surface of the lower mass block (13) are both wavy curved surfaces.

5. The passive variable stiffness tuned mass damper according to claim 4, characterized in that: The upper mass block (12) is in a "cross" shape, and a guide rail (14) in a "cross" shape and vertically aligned with the upper mass block (12) is fixedly mounted on the bottom surface of the inner cavity (111) of the box body; A plurality of lower mass blocks (13) are provided in the inner cavity (111) of the box body, and the lower mass blocks (13) are slidably mounted on the guide rails (14).

6. The passive variable stiffness tuned mass damper according to claim 5, characterized in that: The upper mass block (12) is provided with an elastic pin rod (15) at a concave position of the wavy curved surface, and the elastic pin rod (15) protrudes from the lower surface of the upper mass block (12); When the lower mass block (13) passes a position below the elastic pin rod (15), the lower end portion of the elastic pin rod (15) abuts against the upper surface of the lower mass block (13).

7. The passive variable stiffness tuned mass damper according to claim 1, characterized in that: The upper box (11) is respectively equipped with an upper limiter (81) corresponding to each of the variable stiffness spring modules (5), and the upper end of each variable stiffness spring module (5) is respectively limited and installed on the upper limiter (81); The bottom plate (3) is respectively provided with a lower limiter (82) corresponding to each variable stiffness spring module (5), and the lower end of each variable stiffness spring module (5) is respectively limited and installed on the lower limiter (82).

8. The passive variable stiffness tuned mass damper according to claim 1, characterized in that: A top through hole for the center rod (4) to pass through is formed at the upper end of the damper housing (21), and an oil seal (9) is installed between the interior of the top through hole and the center rod (4).

9. The passive variable stiffness tuned mass damper according to claim 1, characterized in that: Each of the energy-consuming plates (24) is provided with hourglass-shaped holes (241) distributed at even intervals.

10. A three-dimensional vibration reduction device, characterized in that: The invention comprises a passive variable stiffness tuned mass damper as described in any one of claims 1 to 9.

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