Tuned mass damper

Abstract

This invention discloses a tuned mass damper, relating to the field of tuned mass damper technology. The tuned mass damper includes a housing, two mass modules, and a cosine beam. The two mass modules are disposed within the housing and are spaced vertically. Each mass module includes a vibration-absorbing component and multiple elastic elements disposed around its periphery. The multiple elastic elements extend laterally along the vibration-absorbing component, with one end connected to the vibration-absorbing component and the other end connected to the housing. The cosine beam is disposed between the two vibration-absorbing components, with its upper end connected to the upper vibration-absorbing component and its lower end connected to the lower vibration-absorbing component. This application achieves a wider effective vibration suppression frequency band by using two vibration-absorbing components (upper and lower) in conjunction with the cosine beam to absorb vibration. By arranging multiple elastic elements around the vibration-absorbing components, compared to tuned mass dampers that absorb vibration in a single dimension, it achieves vibration absorption in multiple dimensions, and the structure is simple and easy to replace.

Description

Technical Field

[0001] This invention relates to the field of tuned mass damper technology, and specifically to a tuned mass damper. Background Technology

[0002] With the continuous advancement and development of science and technology, the impact of environmental vibrations generated during the operation of urban infrastructure and vibrations from vibration sources within buildings on large precision instruments has become a research focus. Large precision instruments operate in complex dynamic environments and are extremely sensitive to vibration. The intensity of vibration can severely affect their operational accuracy and may even cause irreversible damage. Therefore, large precision instruments have strict requirements regarding the magnitude of environmental vibrations and their own vibrations. Damping-based passive control technology is widely used to control the vibration response of structures. Among these, the tuned mass damper is an energy-absorbing device that absorbs energy during the oscillation of the oscillator to achieve vibration reduction. However, traditional tuned mass dampers have a narrow effective vibration suppression bandwidth. Therefore, developing a new type of tuned mass damper is of great significance for protecting large precision instruments and improving vibration reduction performance. Summary of the Invention

[0003] The main objective of this invention is to propose a tuned mass damper that aims to solve the problem of narrow effective vibration suppression bandwidth in existing tuned mass dampers.

[0004] To achieve the above objectives, the present invention proposes a tuned mass damper, wherein the tuned mass damper comprises:

[0005] case;

[0006] Two mass modules are disposed within the housing, and the two mass modules are spaced apart vertically. Each mass module includes a vibration-absorbing component and a plurality of elastic elements disposed on its periphery. The plurality of elastic elements extend laterally along the vibration-absorbing component, with one end of each elastic element connected to the vibration-absorbing component and the other end connected to the housing; and,

[0007] A cosine beam is disposed between the two vibration-absorbing components. The upper end of the cosine beam is connected to the vibration-absorbing component above, and the lower end of the cosine beam is connected to the vibration-absorbing component below.

[0008] Optionally, each of the vibration-absorbing components includes a mass mounting base and a plurality of sub-masses, wherein the plurality of sub-masses are sequentially arranged in the mass mounting base along the vertical direction;

[0009] The upper end of the cosine beam is connected to the lower end of the mass mounting base located above, and the lower end of the cosine beam is connected to the upper end of the sub-mass located below.

[0010] The number of sub-masses can be adjusted.

[0011] Optionally, the cosine beam is a positive stiffness element;

[0012] The initial stiffness of the cosine beam is adjustable.

[0013] Optionally, the number of elastic elements in each of the mass modules is even, and the multiple elastic elements are symmetrically arranged in pairs along the horizontal direction on the periphery of the vibration absorption assembly.

[0014] Optionally, the upper end of the housing is provided with an opening, and the inner sidewall of the housing is provided with a plurality of mounting grooves distributed circumferentially, the plurality of mounting grooves extending downward from the periphery of the opening;

[0015] The ends of the multiple elastic elements away from the vibration-absorbing assembly are respectively installed in the multiple mounting slots.

[0016] Optionally, the plurality of mounting slots are plurality of wedge-shaped slots, wherein the cross-section of the wedge-shaped slots in the vertical direction is wedge-shaped;

[0017] Each of the elastic elements has a wedge-shaped mounting portion at one end away from the vibration-absorbing assembly, and each of the wedge-shaped mounting portions is fixedly installed in a plurality of wedge-shaped grooves.

[0018] Optionally, the plurality of mounting slots are plurality of receiving slots, and the receiving slots are provided with a plurality of positioning screws extending in the vertical direction, the lower ends of the plurality of positioning screws being fixedly connected to the housing;

[0019] Each of the elastic elements has a positioning hole extending vertically through one end away from the vibration-absorbing assembly. The positioning holes are respectively fitted onto the positioning screws and are fixedly connected to the positioning screws by screwing assemblies.

[0020] Optionally, the two mass modules include a first mass module and a second mass module. The elastic element and vibration-absorbing component disposed in the first mass module are respectively the first elastic element and the first vibration-absorbing component. The elastic element and vibration-absorbing component disposed in the second mass module are respectively the second elastic element and the second vibration-absorbing component. Among the plurality of mounting slots, half of the mounting slots are wedge-shaped slots, and the other half of the mounting slots are receiving slots. The receiving slots are respectively provided with a plurality of positioning screws. The plurality of wedge-shaped slots and the plurality of receiving slots are distributed at intervals along the circumference of the housing, so that each of the first elastic elements and each of the second elastic elements are arranged at an angle in the horizontal direction, wherein:

[0021] Each of the first elastic elements has a first wedge-shaped mounting portion at its end away from the first vibration-absorbing assembly. Each first wedge-shaped mounting portion is fixedly installed in one of the multiple wedge-shaped grooves. Each of the second elastic elements has a second positioning hole penetrating vertically at its end away from the second vibration-absorbing assembly. The multiple second positioning holes are correspondingly fitted onto the multiple positioning screws and are respectively fixedly connected to the multiple positioning screws via screw-in assemblies; or...

[0022] Each of the second elastic elements has a second wedge-shaped mounting portion at one end away from the second vibration-absorbing assembly. Each of the second wedge-shaped mounting portions is fixedly installed in the corresponding wedge-shaped groove. The ends of the plurality of first elastic elements away from the first vibration-absorbing assembly are respectively provided with first positioning holes that penetrate in the vertical direction. The plurality of first positioning holes are correspondingly sleeved on the plurality of positioning screws and are respectively fixedly connected to the plurality of positioning screws through screwing assemblies.

[0023] Optionally, the opening is provided with a cover, and the inner side of the opening is provided with a positioning groove arranged in the circumferential direction. The cover is located at the opening and the periphery of the cover abuts against the positioning groove.

[0024] The upper surface of the shell cover is provided with a groove.

[0025] Optionally, the tuned mass damper further includes a guide rod disposed within the housing, the guide rod extending in the vertical direction, and the lower end of the guide rod being fixedly installed on the lower side wall of the housing;

[0026] Both vibration-absorbing components have a first guide hole extending vertically through their middle portions, and the cosine beam has a second guide hole extending vertically through its middle portion. The guide rod passes through the first guide hole and the second guide hole, respectively.

[0027] In the technical solution of the present invention, the tuned mass damper includes a housing, two mass modules, and a cosine beam. The two mass modules are disposed within the housing and are spaced apart vertically. Each mass module includes a vibration-absorbing component and multiple elastic elements disposed around its periphery. The multiple elastic elements extend laterally along the vibration-absorbing component, with one end connected to the vibration-absorbing component and the other end connected to the housing. The cosine beam is disposed between the two vibration-absorbing components, with its upper end connected to the upper vibration-absorbing component and its lower end connected to the lower vibration-absorbing component. The mass of the two vibration-absorbing components is adjustable, and the stiffness of the cosine beam is adjustable. By setting the cosine beam between the two vibration-absorbing components and through the rational design of the cosine beam, the two vibration-absorbing components and the cosine beam work together to absorb vibration, thus widening the vibration suppression bandwidth. Compared with existing tuned mass dampers, the effective vibration suppression bandwidth is wider. Furthermore, the arrangement of multiple elastic elements allows the tuned mass damper to absorb vibration not only in the vertical direction but also in at least two lateral directions, achieving a three-dimensional vibration absorption effect and making it more widely applicable. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 A schematic diagram of an embodiment of the tuned mass damper provided by the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the opening structure of the housing cover of the tuned mass damper;

[0031] Figure 3 for Figure 1 A partial structural diagram;

[0032] Figure 4 for Figure 3 A structural schematic diagram of the two mass modules and the cosine beam.

[0033] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of a cochord beam;

[0034] Figure 6 for Figure 1 Schematic diagram of the middle shell structure;

[0035] Figure 7 for Figure 1 A schematic diagram of the cross-sectional structure of the middle cover.

[0036] Explanation of icon numbers:

[0037] label name label name 100 Tuned mass damper 22 elastic element 1 case 221 wedge mounting part 11 Mounting slot 222 positioning screw 111 wedge groove 223 Screw assembly 112 Container 3 cosine beam 12 Mounting platform 31 Second guide hole 13 positioning groove 4 Guide rod 2 Quality Module 5 Shell Cap 21 Vibration Absorption Components 51 Cut out 211 Quality mounting base 52 Positioning convex part 212 Submass 53 Match the convex part 213 First guide hole

[0038] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0041] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0042] With the continuous advancement and development of science and technology, the impact of environmental vibrations generated during the operation of urban infrastructure and vibrations from vibration sources within buildings on large precision instruments has become a research focus. Large precision instruments operate in complex dynamic environments and are extremely sensitive to vibration. The intensity of vibration can severely affect their operational accuracy and may even cause irreversible damage. Therefore, large precision instruments have strict requirements regarding the magnitude of environmental vibrations and their own vibrations. Damper-based passive control technology is widely used to control the vibration response of structures. Among these, the tuned mass damper is an energy-absorbing device that absorbs energy during the oscillation of the oscillator to achieve vibration reduction. However, traditional tuned mass dampers have a narrow effective vibration suppression bandwidth. Therefore, developing a new type of tuned mass damper is of great significance for protecting large precision instruments and improving vibration reduction performance.

[0043] This invention proposes a tuned mass damper, which aims to solve the problem of narrow effective vibration suppression bandwidth of existing tuned mass dampers.

[0044] Please see Figures 1 to 7 This is an embodiment of a tuned mass damper 100 proposed by the present invention. In this embodiment, the tuned mass damper 100 includes a housing 1, two mass modules 2, and a cosine beam 3. The two mass modules 2 are disposed inside the housing 1 and are distributed vertically at intervals. Each mass module 2 includes a vibration-absorbing component 21 and a plurality of elastic elements 22 disposed on its periphery. The plurality of elastic elements 22 extend laterally along the vibration-absorbing component 21. One end of each elastic element 22 is connected to the vibration-absorbing component 21, and the other end is connected to the housing 1. The cosine beam 3 is disposed between the two vibration-absorbing components 21. The upper end of the cosine beam 3 is connected to the upper vibration-absorbing component 21, and the lower end of the cosine beam 3 is connected to the lower vibration-absorbing component 21. The mass of the two vibration-absorbing components 21 is adjustable, and the stiffness of the cosine beam 3 is adjustable. By setting the cosine beam 3 between the two vibration-absorbing components 21 and through the reasonable design of the cosine beam 3, the two vibration-absorbing components 21 and the cosine beam 3 work together to absorb vibration, thus widening the vibration suppression frequency band. Compared with the existing tuned mass damper 100, the effective vibration suppression frequency band is wider. When vibration occurs in various directions, the elastic deformation of the multiple elastic elements 22 drives the two vibration-absorbing components 21 to vibrate in opposite directions to achieve the effect of vibration damping. Vibration in multiple directions can be controlled. Furthermore, the arrangement of multiple elastic elements 22 allows the tuned mass damper 100 to absorb vibration not only in the vertical direction but also in at least two lateral directions, achieving a three-dimensional vibration absorption effect and making it more adaptable.

[0045] Furthermore, the number of elastic elements 22 in each of the mass modules 2 is even, and the multiple elastic elements 22 are symmetrically arranged in pairs along the horizontal direction on the periphery of each vibration-absorbing component 21. A three-dimensional XYZ coordinate system is established with the vertical direction as the Z-axis. The multiple elastic elements 22 and the corresponding vibration-absorbing components 21 can form a tuned mass damper 100 in the X and Y axes, thereby achieving multi-dimensional vibration control.

[0046] It should be noted that the number of elastic elements 22 is not limited here. In a preferred embodiment, the number of elastic elements 22 in both mass modules 2 is four. In other embodiments, the number of elastic elements 22 in each mass module 2 may be greater than four, and the number of elastic elements 22 in the two mass modules 2 may be different.

[0047] In this embodiment, since the multiple vibration-absorbing components 21 are fixedly connected to the housing 1 by the multiple elastic elements 22, the multiple elastic elements 22 are preferably elastic plates, and the rigidity of the multiple elastic plates should not be too small to prevent the vibration-absorbing components 21 from being unstable and vibrating frequently. It should be noted that the length, material, and size of the multiple elastic plates can be designed and adjusted according to actual engineering needs. The length of the elastic plates can be adjusted according to the vibration suppression frequency range and the mass of the project. Metal and plastic materials can be selected according to the elasticity and stiffness requirements, and the adjustable dimensions include thickness and width. In this embodiment, the thickness direction of the multiple elastic plates is oriented towards the Z-axis direction. Therefore, the tuned mass damper 100 has the best vibration suppression effect in the Z-axis direction. When vibration occurs in the X-axis and Y-axis directions, the multiple elastic plates undergo slight elastic deformation to suppress circumferential vibration. In other embodiments, the thickness direction of the multiple elastic plates can also be oriented in other directions to adapt to other equipment or usage scenarios.

[0048] In one embodiment, each vibration-absorbing component 21 includes a mass mounting base 211 and a plurality of sub-masses 212, which are sequentially arranged in the mass mounting base 211 along a vertical direction. The upper end of the cosine beam 3 is connected to the lower end of the upper mass mounting base 211, and the lower end of the cosine beam 3 is connected to the upper end of the lower sub-masses 212. The number of sub-masses 212 is adjustable. The mass mounting base 211 has a receiving cavity, and the plurality of sub-masses 212 are installed in the receiving cavity. The mass of the vibration-absorbing component 21 is adjustable by adjusting the number of sub-masses 212. The arrangement of the mass mounting base 211 makes it easy to replace the multiple sub-masses 212; during adjustment, it is not necessary to disassemble the entire component, but only to replace the internal sub-masses 212.

[0049] It should be noted that, to ensure that the multiple sub-masses 212 and the mass mounting base 211 are integrated as a whole, the multiple sub-masses 212 of each vibration-absorbing component 21 are glued together as a whole, and the glued multiple sub-masses 212 are bonded to the bottom of the receiving cavity by gluing. The upper end of the cosine beam 3 is glued to the lower end of the upper mass mounting base 211, and the lower end of the cosine beam 3 is glued to the upper end of the lower multiple sub-masses 212.

[0050] In one embodiment, the cosine beam 3 is a positive stiffness element; wherein, the initial stiffness of the cosine beam 3 is adjustable. In the technical solution of the present invention, the cosine beam 3 is used as a positive stiffness element (increase in displacement, increase in structural reaction force), which is more stable and simpler to manufacture than a negative stiffness element (increase in displacement, decrease in structural reaction force). The cosine beam 3 can be designed according to the actual engineering needs, taking into account the different physical characteristics and dynamic environments of large precision instruments. The present invention can be used in combination or arranged continuously.

[0051] It should be noted that the length, material, and dimensions of the cosine beam 3 can be designed and adjusted according to actual engineering needs.

[0052] In this embodiment of the invention, the upper end of the housing 1 is provided with an opening for assembling two mass modules 2. The inner sidewall of the housing 1 is provided with a plurality of mounting grooves 11 distributed circumferentially, and the plurality of mounting grooves 11 extend downward from the periphery of the opening. The ends of the plurality of elastic members 22 away from the vibration absorption assembly 21 are respectively installed in the plurality of mounting grooves 11.

[0053] In a specific embodiment of the present invention, the plurality of mounting grooves 11 are plurality of wedge-shaped grooves 111, and the cross-section of the wedge-shaped grooves 111 in the vertical direction is wedge-shaped; each elastic member 22 has a wedge-shaped mounting portion 221 at one end away from the vibration-absorbing assembly 21, and each wedge-shaped mounting portion 221 is fixedly installed in the plurality of wedge-shaped grooves 111. During installation, the wedge-shaped mounting portion 221 of each elastic member 22 enters the wedge-shaped groove 111 from the upper end of the wedge-shaped groove 111, slides downward and is fixedly installed. Specifically, the bottom wall of the wedge-shaped groove 111 is provided with a threaded hole, and the wedge-shaped mounting portion 221 is provided with a corresponding through hole. When the wedge-shaped mounting portion 221 slides to the point where the through hole corresponds to the threaded hole, the wedge-shaped mounting portion 221 is fixedly installed in the wedge-shaped groove 111 by passing a bolt or screw through the through hole. The wedge-shaped installation structure is simple and stable, and the elastic member 22 is not easily dislodged from the wedge-shaped groove 111.

[0054] It should be noted that the bottom wall of the wedge groove 111 preferably has multiple threaded holes to facilitate adjustment of the position of the vibration absorption assembly 21 in the vertical direction.

[0055] It is understood that the wedge-shaped mounting portions 221 of the multiple elastic elements 22 of the two mass modules 2 located in the vertical direction can be installed correspondingly in the same wedge-shaped groove 111, or they can be staggered. For example, in one embodiment, each mass module 2 includes four elastic elements 22, and the number of wedge-shaped grooves 111 is set to four. Then, the four elastic elements 22 of each mass module 2 need to be correspondingly set in the four wedge-shaped grooves 111 in the vertical direction. At this time, each wedge-shaped groove 111 has at least two threaded holes spaced apart in the vertical direction for the two wedge-shaped mounting portions 221 to be installed. In another embodiment, each mass module 2 includes four elastic elements 22, and the number of wedge-shaped grooves 111 is set to eight. Then, the four elastic elements 22 of each mass module 2 can be staggered in the wedge-shaped grooves 111 to facilitate subsequent installation and debugging.

[0056] In another specific embodiment of the present invention, the plurality of mounting grooves 11 are plurality of receiving grooves 112, and the receiving grooves 112 are provided with a plurality of positioning screws 222 extending in the vertical direction. The lower ends of the plurality of positioning screws 222 are fixedly connected to the housing 1. The ends of the plurality of elastic members 22 away from the vibration absorption assembly 21 are respectively provided with positioning holes that penetrate in the vertical direction. The plurality of positioning holes are correspondingly sleeved on the plurality of positioning screws 222 and are respectively fixedly connected to the plurality of positioning screws 222 through screwing assemblies 223.

[0057] In this embodiment, a plurality of positioning screws 222 are fixedly installed on the housing 1 by means of threaded connection. To facilitate installation, a mounting platform 12 is also provided in the receiving groove 112. The mounting platform 12 is located at the bottom of the housing 1. The upper end of the mounting platform 12 is provided with a threaded hole extending vertically. The positioning screws 222 are threadedly engaged with the threaded hole of the mounting platform 12.

[0058] The screw assembly 223 includes two nuts. During installation, one nut is first fixed on the positioning screw 222. The positioning hole of the elastic member 22 is then fitted onto the positioning screw 222 from top to bottom and abuts against the first nut. Then, the second nut is installed on the positioning screw 222. The two positioning nuts abut against the upper and lower end faces of the elastic member 22 respectively, thereby positioning the elastic member 22 in the vertical direction. By adjusting the position of the nuts on the positioning screw 222, the position of the corresponding vibration absorption assembly 21 in the Z-axis direction can be adjusted.

[0059] It is understood that, similar to the previous specific embodiment, the elastic elements 22 corresponding to the two mass modules 2 in this specific embodiment can also be installed on the same positioning screw 222, or they can be staggered. The setting method is the same, and will not be described in detail here.

[0060] In another specific embodiment of the present invention, the two mass modules 2 include a first mass module 2 and a second mass module 2. The elastic element 22 and the vibration absorption component 21 disposed in the first mass module 2 are respectively the first elastic element 22 and the first vibration absorption component 21. The elastic element 22 and the vibration absorption component 21 disposed in the second mass module 2 are respectively the second elastic element 22 and the second vibration absorption component 21. Among the plurality of mounting slots 11, half of the mounting slots 11 are wedge-shaped slots 111, and the other half of the mounting slots 11 are receiving slots 112. The receiving slots 112 are respectively provided with a plurality of positioning screws 222. The plurality of wedge-shaped slots 111 and the plurality of receiving slots 112 are distributed circumferentially around the housing 1, so that each first elastic element 22 and each second elastic element 22 are arranged at an angle in the horizontal direction. The first wedge-shaped mounting is provided at the end of the plurality of first elastic elements 22 away from the first vibration absorption component 21. Part 221, each of the first wedge-shaped mounting parts 221 is fixedly installed in the plurality of wedge-shaped grooves 111, and the ends of the plurality of second elastic members 22 away from the second vibration-absorbing component 21 are respectively provided with second positioning holes that penetrate in the vertical direction. The plurality of second positioning holes are correspondingly sleeved on the plurality of positioning screws 222 and are respectively fixedly connected to the plurality of positioning screws 222 through screwing components 223; or, each of the second elastic members 22 is provided with a second wedge-shaped mounting part 221 at the end away from the second vibration-absorbing component 21, and each of the second wedge-shaped mounting parts 221 is fixedly installed in the corresponding wedge-shaped groove 111. The ends of the plurality of first elastic members 22 away from the first vibration-absorbing component 21 are respectively provided with first positioning holes that penetrate in the vertical direction. The plurality of first positioning holes are correspondingly sleeved on the plurality of positioning screws 222 and are respectively fixedly connected to the plurality of positioning screws 222 through screwing components 223.

[0061] In this embodiment, the first elastic element 22 and the second elastic element 22 are installed using the methods described in the two aforementioned specific embodiments, and are staggered to avoid motion interference and facilitate installation. Specific installation methods can be found in the two aforementioned specific embodiments, and will not be described in detail here.

[0062] It should be noted that in the above three specific embodiments, the length, cross-sectional shape and size of the positioning screw 222 and the wedge groove 111 can be adjusted according to the actual situation. The above three embodiments cannot be used as a basis for limiting the technical solution of the present invention. Other installation combinations are also possible. All those that utilize the above design concept should be within the protection scope of this application.

[0063] Furthermore, based on the above three specific embodiments, each of the mass mounting bases 211 has a plurality of connecting portions on its periphery, and the plurality of connecting portions are provided with a plurality of connecting members. In one embodiment, the connecting portion is a protrusion with a threaded hole, and each of the connecting members has a through hole at one end facing the vibration absorption assembly 21. Installation is achieved by bolts or screws passing through the through hole and engaging with the threaded hole on the protrusion. In another embodiment, the connecting portion can also be a protrusion with a slot, and each of the connecting members has a buckle at one end facing the vibration absorption assembly 21. Fixed connection is achieved by the buckle engaging with the slot.

[0064] In one embodiment, a cover 5 is provided at the opening, and a positioning groove 13 is provided on the inner side of the opening along the circumference. The cover 5 is placed over the opening, and the periphery of the cover 5 abuts against the positioning groove 13. The upper surface of the cover 5 is provided with a notch 51. The cover 5 seals the housing 1 to form a closed space. To facilitate the installation of the cover 5 and the sealing of the housing 1, the positioning groove 13 is provided on the inner side of the opening. Positioning and sealing are achieved by installing the cover 5 within the positioning groove 13. To facilitate opening the cover 5 for maintenance and adjustment, the upper surface of the cover 5 is also provided with the notch 51. Disassembly is simple; only the notch 51 needs to be pulled. It is understood that the position and number of the notches 51 are not limited here. Preferably, the notches 51 are located at the edge of the cover 5.

[0065] Furthermore, to improve sealing, the lower end face of the cover 5 is provided with a downwardly extending positioning protrusion 52. The positioning protrusion 52 is arranged in a ring shape. When the cover 5 is placed over the opening, the outer edge of the positioning protrusion 52 abuts against the inner sidewall of the housing 1 to achieve further sealing.

[0066] In this embodiment, the shell cover 5 is a rigid plate.

[0067] In one embodiment of the present invention, the tuned mass damper 100 further includes a guide rod 4 disposed within the housing 1. The guide rod 4 extends vertically, and its lower end is fixedly mounted on the lower side wall of the housing 1. Each of the two vibration-absorbing components 21 has a first guide hole 213 extending vertically through its center, and the cosine beam 3 has a second guide hole 31 extending vertically through its center. The guide rod 4 passes through the first guide hole 213 and the second guide hole 31, respectively. By providing the guide rod 4, the movement of the two vibration-absorbing components 21 in the Z-axis direction is limited. To facilitate vibration in the X and Y axes, the guide rod 4 is clearance-fitted with the first guide hole 213 and the second guide hole 31, allowing both vibration-absorbing components 21 and the cosine beam 3 to vibrate slightly in the X and Y axes. The specific clearance can be adjusted according to actual conditions.

[0068] In this embodiment, to facilitate the positioning of the guide rod 4, the lower end face of the cover 5 is also provided with a mating protrusion 53, which mates with the upper end of the guide rod 4 to ensure the stability of the guide rod 4.

[0069] In this embodiment of the invention, the housing 1, the cover 5, the upper vibration absorber mass 212, the upper mass mounting base 211, the lower vibration absorber mass 212, and the lower mass mounting base 211 are all made of stainless steel. The external shape of the housing 1 can be determined according to the actual installation situation. The dimensions of the housing 1, as well as the outer and inner surfaces of the housing 1, can be optimized according to actual engineering needs.

[0070] In this embodiment of the invention, the housing 1 can be rigidly connected to the controlled object by connecting bolts. The connection method can be optimized according to the actual engineering needs. For example, in another embodiment, it can be connected to the controlled object by snap-fit ​​or welding.

[0071] The beneficial effects of this invention are as follows:

[0072] 1. This invention utilizes the advantage of the horizontally symmetrical arrangement of multiple elastic elements 22 to achieve three-dimensional multi-directional vibration control. It features a simple structure, ease of installation, and can be widely applied to the three-dimensional multi-directional vibration reduction control of large precision instruments under complex dynamic environments and in different directions. Compared to traditional tuned mass dampers 100, it has a wider effective vibration suppression bandwidth and eliminates the need for tuned mass dampers 100 in different directions, reducing the adverse effects of additional structural mass on the entire system.

[0073] 2. In this invention, the cosine beam 3 is used as a positive stiffness element (increased displacement leads to increased structural reaction force), which is more stable and simpler to manufacture compared to negative stiffness elements (increased displacement leads to decreased structural reaction force). The cosine beam 3 can be designed according to the actual engineering needs, taking into account the different physical characteristics and dynamic environments of large precision instruments. This invention can be used in combination or arranged continuously.

[0074] 3. The present invention is reliable and stable and does not require external energy supply. When a component fails, the two mass modules 2 can each function as a tuned mass damper 100 system and can still work normally.

[0075] 4. This invention is easy to adjust and replace, and can be applied to large precision instruments with different vibration absorption indicators. By replacing the sub-masses 212 in the upper and lower layers, adjusting the positions of the multiple elastic elements 22 in the upper and lower layers, adjusting the preload height of the cosine beam 3, and directly replacing the cosine beam 3, the effective vibration suppression frequency band can be broadened.

[0076] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A tuned mass damper characterized by, The tuning mass damper comprises: a shell; two mass modules arranged in the shell, the two mass modules are arranged in an up-down direction, each mass module comprises a vibration absorbing assembly and a plurality of elastic members arranged on the periphery of the vibration absorbing assembly, the plurality of elastic members extend along the lateral direction of the vibration absorbing assembly, one end of each elastic member is connected with the vibration absorbing assembly, and the other end is connected with the shell; and a cosine beam arranged between the two vibration absorbing assemblies, the upper end of the cosine beam is connected with the vibration absorbing assembly above, and the lower end of the cosine beam is connected with the vibration absorbing assembly below; each vibration absorbing assembly comprises a mass mounting seat and a plurality of sub-masses arranged in the mass mounting seat in sequence in the up-down direction; the upper end of the cosine beam is connected to the lower end of the mass mounting seat above, and the lower end of the cosine beam is connected to the upper end of the sub-mass below; wherein the number of sub-masses is adjustable; the upper end of the shell is provided with an opening, the inner side wall of the shell is provided with a plurality of mounting grooves arranged in the circumferential direction, the plurality of mounting grooves extend downward from the circumferential edge of the opening; one end of each elastic member away from the vibration absorbing assembly is arranged in the plurality of mounting grooves respectively; the tuning mass damper further comprises a guide rod arranged in the shell, the guide rod extends in the up-down direction, the lower end of the guide rod is fixedly arranged on the lower side wall of the shell; the middle part of each vibration absorbing assembly is provided with a first guide hole penetrating in the up-down direction, and the middle part of the cosine beam is provided with a second guide hole penetrating in the up-down direction, and the guide rod penetrates through the first guide hole and the second guide hole respectively.

2. The tuned mass damper of claim 1, wherein, The cosine beam is a positive stiffness element; wherein the initial stiffness of the cosine beam is adjustable.

3. The tuned mass damper of claim 1, wherein, The number of elastic members of each mass module is even, and the plurality of elastic members are arranged on the periphery of the vibration absorbing assembly in pairs in the horizontal direction.

4. The tuned mass damper of claim 1, wherein, The plurality of mounting grooves are a plurality of wedge-shaped grooves, the cross section of the wedge-shaped groove in the up-down direction is wedge-shaped; one end of each elastic member away from the vibration absorbing assembly is provided with a wedge-shaped mounting portion, and each wedge-shaped mounting portion is fixedly arranged in the plurality of wedge-shaped grooves.

5. The tuned mass damper of claim 1, wherein, The plurality of mounting grooves are a plurality of accommodating grooves, the accommodating grooves are provided with a plurality of positioning screws extending in the up-down direction, and the lower ends of the plurality of positioning screws are fixedly connected with the shell; one end of each elastic member away from the vibration absorbing assembly is provided with a positioning hole penetrating in the up-down direction, the plurality of positioning holes are correspondingly sleeved on the plurality of positioning screws, and are fixedly connected with the plurality of positioning screws through a screwing assembly respectively.

6. The tuned mass damper of claim 1, wherein, Two mass modules include a first mass module and a second mass module, the elastic members and vibration absorbing assemblies arranged in the first mass module are a first elastic member and a first vibration absorbing assembly respectively, the elastic members and vibration absorbing assemblies arranged in the second mass module are a second elastic member and a second vibration absorbing assembly respectively, half of the mounting slots are wedge-shaped slots, and the other half of the mounting slots are accommodating slots, the accommodating slots are respectively provided with a plurality of positioning screws, the wedge-shaped slots and the accommodating slots are distributed along the circumference of the shell, so that the first elastic members and the second elastic members are arranged at an angle in the horizontal direction, and wherein: The first end of the first elastic member away from the first vibration absorbing assembly is provided with a first wedge-shaped mounting portion, the first wedge-shaped mounting portion is fixedly installed in the wedge-shaped slot, the first end of the second elastic member away from the second vibration absorbing assembly is respectively provided with a second positioning hole penetrating in the up-down direction, the second positioning hole is correspondingly sleeved on the positioning screw, and the second positioning hole is fixedly connected with the positioning screw through a screw connection assembly; or, The first end of the second elastic member away from the second vibration absorbing assembly is provided with a second wedge-shaped mounting portion, the second wedge-shaped mounting portion is fixedly installed in the corresponding wedge-shaped slot, the first end of the first elastic member away from the first vibration absorbing assembly is respectively provided with a first positioning hole penetrating in the up-down direction, the first positioning hole is correspondingly sleeved on the positioning screw, and the first positioning hole is fixedly connected with the positioning screw through a screw connection assembly.

7. The tuned mass damper of claim 1, wherein The opening is provided with a shell cover, the inner side of the opening is provided with a positioning groove arranged in the circumferential direction, the shell cover is arranged at the opening, and the circumferential edge of the shell cover is in abutting fit with the positioning groove. Wherein, the upper end surface of the shell cover is provided with a notch.

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