Modular tuned mass damper with adjustable frequency

Abstract

The utility model discloses a frequency-adjustable modularized tuned mass damper, which belongs to the technical field of dampers, and comprises an elastic element assembly, a damper and an adjusting assembly, mass blocks are designed into uniform mass blocks, and are uniformly and symmetrically placed in a steel container with a partition plate; the metal spring is machined and produced according to the optimal rigidity K. When the tuned mass damper only needs to provide vertical damping, the viscous damper is arranged in the middle of the tuned mass damper, the viscous damper is a speed type damper, and the higher the movement speed in the stroke is, the better the energy consumption effect is. A cylinder type damper can be arranged in the middle of the tuned mass damper, and the cylinder type damper achieves the energy consumption effect through a damping material and a fluid loop in a closed space. Finally, after all the components are assembled, the lower connecting plate, the upper connecting plate and the metal spring are connected through nuts, and the tuned mass damper system is formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of dampers, and in particular relates to a frequency-adjustable modular tuned mass damper. Background Art

[0002] With technological advancements and the development of urban construction, the number of long-span bridges, corridors, and cantilevered buildings is increasing. A characteristic of these structures is that, while their strength and stiffness can meet regulatory and functional requirements through proper design, their inherent vibration frequencies are often relatively low. For example, the natural frequency of a pedestrian bridge is generally above 3 Hz, while the frequency of human excitation is around 2.5 Hz. This resonates with the natural frequency of the bridge, potentially causing severe discomfort and panic for pedestrians, damage to the structure itself, and even lead to accidents. Furthermore, increasing the natural frequency by modifying structural properties often comes at a high cost. Furthermore, some super-high-rise buildings, towering structures, and mast structures experience significant sway under wind loads, causing discomfort to occupants and potentially affecting the building's functionality or causing structural damage. To address these issues, the addition of tuned mass dampers (TMDs) for vibration control is a common and effective approach in engineering design.

[0003] A tuned mass damper, also known as a dynamic vibration absorber, is a substructure attached to a main structure. Its natural frequency is close to the main structure's natural frequency. When the main structure vibrates, the substructure generates an inertial force in the opposite direction, controlling the main structure's vibration amplitude and accelerating its vibration attenuation.

[0004] After searching, the prior art patent, application number 201910244462.0, discloses a tuned mass damper that can easily adjust the mass to meet the needs of frequency adjustment during on-site installation, and the installation space is compact. By installing the mass adjustment plate on the connecting plate with long bolts to lock the main mass assembly, when locked, the long bolts are unscrewed, and the adjustment mass plate is added and removed, so that the mass can be easily adjusted without changing the spring stiffness and damping of the tuned mass damper, meeting the needs of frequency adjustment during on-site installation of the tuned mass damper. At the same time, the damper generates damping force to consume the structural vibration energy, thereby reducing the vertical vibration of the structure.

[0005] The above technical solution also has the following deficiencies: (1) the adjustment mass is achieved through the mass adjustment plate, and the accuracy of the adjustment mass is difficult to guarantee; (2) the damper is confined within the elastic element, and its specifications and energy dissipation direction are restricted, and the energy dissipation effect and scope of application are restricted. Utility Model Content

[0006] The vibration frequency of the tuned mass damper needs to be close to the vibration frequency of the engineering structure to achieve an effective vibration reduction effect. However, there are often cases where the simulation analysis is inconsistent with the actual frequency of the engineering structure, and the deviation may even be large. Moreover, as the service life of the engineering structure increases, the structural characteristics change, and the tuned mass damper cannot achieve the best vibration control effect. To address the above problems, the utility model provides a frequency-adjustable modular tuned mass damper. The system includes an elastic element component, a damper, and an adjustment assembly. The adjustment assembly can adjust the mass conveniently and accurately. The damper is set in the center of the tuned mass damper product. The synergistic effect of the adjustment assembly and the damper can effectively solve the above problems.

[0007] In order to obtain a frequency-adjustable modular tuned mass damper, the utility model adopts the following technical solutions:

[0008] A frequency-adjustable modular tuned mass damper includes elastic element assemblies located at the four corners of the tuned mass damper product; an adjustment assembly located in the middle of the tuned mass damper product; a damper located in the center of the adjustment assembly; and an upper connecting plate and a lower connecting plate, the lower end of the upper connecting plate and the upper end of the lower connecting plate being fixedly connected to a metal container.

[0009] Specifically, the energy generated by structural vibration can be consumed by the damper, and the vibration control effect can be achieved by adjusting the assembly.

[0010] Furthermore, the elastic element assembly includes a locator, a metal spring, a metal guide rod, an oil-free bearing, and a nut. The locator is arranged at the four corners of the tuned mass damper product and is reliably connected to the adjacent connecting plates. The locator plays a role in positioning the metal spring and protecting the metal spring connection node; the metal spring is located inside the locator and is reliably connected to the adjacent connecting plates. The metal spring provides stiffness for the substructure and is processed and produced according to the optimal stiffness; a metal guide rod is arranged in the middle of the metal spring, the metal guide rod passes through the upper end of the upper connecting plate and is threadedly connected with a nut, the outer wall of the metal guide rod at the contact position with the upper connecting plate is slidably connected with an oil-free bearing, the outer wall of the oil-free bearing is fixedly connected to the upper connecting plate, the metal guide rod plays a role in limiting the large horizontal deformation of the metal spring, and the oil-free bearing can reduce the friction between the guide rod and the upper connecting plate when the substructure vibrates.

[0011] Furthermore, the adjustment assembly includes a metal container, a plurality of partitions are fixedly connected to the inner wall of the metal container, a mass block is detachably connected between every two partitions, and the mass blocks are evenly and symmetrically arranged.

[0012] Specifically, the mass block can be made of materials with different densities and phases, such as standardized steel plates, concrete, mortar, or liquid, with the purpose of designing it based on the optimal mass required for vibration control.

[0013] Furthermore, a viscous damper or a cylinder damper is provided at the inner center of the metal container, and is provided according to the required functions of the design.

[0014] Specifically, the viscous damper is a velocity-type damper. The faster the movement speed within its stroke, the better the energy dissipation effect, and it only has an energy dissipation effect in the direction of movement; the cylinder damper achieves the energy dissipation effect through the damping material and fluid circuit in a closed space, and has a three-way energy dissipation effect.

[0015] Beneficial effects

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In this utility model, the optimal parameters of the tuned mass damper required for the vibration control of the engineering structure are preliminarily determined through theoretical analysis or numerical simulation, namely, the mass M , stiffness K , damping ξ First, the mass block is designed to be uniform and placed evenly and symmetrically in a metal container with a partition. Second, the metal spring is designed to have the optimal stiffness. K Processing and production; then, the damper is set according to the required functions of the design. When the tuned mass damper product only needs to provide vertical damping, a viscous damper is selected. When it needs to have a three-way energy dissipation effect, a cylinder damper is selected; finally, after the assembly of all components is completed, the lower connecting plate and the upper connecting plate are connected with the metal spring through nuts to form a tuned mass damper system.

[0018] In the utility model, after the tuned mass damper is installed at the designed position, the nut is removed, and the metal spring can now move freely. According to the actual characteristics of the engineering structure and the vibration data measured on site, when there is a deviation from the expected effect and the frequency of the tuned mass damper needs to be adjusted, the nut and the upper connecting plate can be removed, and the mass block can be adjusted to match the optimal mass required for vibration control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an isometric view of a frequency-adjustable modular tuned mass damper in the present invention;

[0020] Figure 2 This is a side view of the damper in the present invention, used to illustrate the oil-free bearing and metal spring structure;

[0021] Figure 3This is a top view of the damper in the present invention after removing the upper connecting plate, which is used to illustrate the internal structural design.

[0022] The corresponding relationship between the labels and component names in the figures is as follows:

[0023] 1. Elastic element assembly; 2. Adjustment assembly; 3. Damper; 4. Upper connecting plate; 5. Lower connecting plate; 6. Metal container; 7. Positioner; 8. Metal spring; 9. Metal guide rod; 10. Oil-free bearing; 11. Nut; 12. Partition; 13. Mass block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figures 1-3 As shown, it is a schematic structural diagram of a frequency-adjustable modular tuned mass damper according to an embodiment of the present invention. A frequency-adjustable modular tuned mass damper according to this embodiment includes an elastic element assembly, which is located at the four corners of the tuned mass damper product; an adjustment assembly, which is located in the middle of the tuned mass damper product; a damper, which is located in the center of the adjustment assembly; and an upper connecting plate and a lower connecting plate, wherein the lower end of the upper connecting plate and the upper end of the lower connecting plate are both fixedly connected to the metal container.

[0027] Specifically, the energy generated by structural vibration can be consumed by the damper, and the vibration control effect can be achieved by adjusting the assembly.

[0028] Furthermore, the elastic element assembly includes a locator, a metal spring, a metal guide rod, an oil-free bearing, and a nut. The locator is arranged at the four corners of the tuned mass damper product and is reliably connected to the adjacent connecting plates. The locator plays a role in positioning the metal spring and protecting the metal spring connection node; the metal spring is located inside the locator and is reliably connected to the adjacent connecting plates. The metal spring provides stiffness for the substructure and is processed and produced according to the optimal stiffness; a metal guide rod is arranged in the middle of the metal spring, the metal guide rod passes through the upper end of the upper connecting plate and is threadedly connected with a nut, the outer wall of the metal guide rod at the contact position with the upper connecting plate is slidably connected with an oil-free bearing, the outer wall of the oil-free bearing is fixedly connected to the upper connecting plate, the metal guide rod plays a role in limiting the large horizontal deformation of the metal spring, and the oil-free bearing can reduce the friction between the guide rod and the upper connecting plate when the substructure vibrates.

[0029] Furthermore, the adjustment assembly includes a metal container, a plurality of partitions are fixedly connected to the inner wall of the metal container, a mass block is detachably connected between every two partitions, and the mass blocks are evenly and symmetrically arranged.

[0030] Specifically, the mass block can be made of materials with different densities and phases, such as standardized steel plates, concrete, mortar, or liquid, with the purpose of designing it based on the optimal mass required for vibration control.

[0031] Furthermore, a viscous damper or a cylinder damper is provided at the inner center of the metal container, and is provided according to the required functions of the design.

[0032] Specifically, the viscous damper is a velocity-type damper. The faster the movement speed within its stroke, the better the energy dissipation effect, and it only has an energy dissipation effect in the direction of movement; the cylinder damper achieves the energy dissipation effect through the damping material and fluid circuit in a closed space, and has a three-way energy dissipation effect.

[0033] Product Design: Through theoretical analysis or numerical simulation, the optimal parameters of the tuned mass damper (TMD) required for vibration control of engineering structures—namely, mass M, stiffness K, and damping ξ—are preliminarily determined. First, the mass block is designed to be uniform and placed evenly and symmetrically within a metal container with a partition. Second, the metal spring is manufactured to the optimal stiffness K. Next, the damper is configured based on the required design functionality. When the TMD only requires vertical damping, a viscous damper is used. When three-dimensional energy dissipation is required, a cylinder damper is selected. Finally, after all components are assembled, the lower and upper connecting plates are connected to the metal springs using nuts to form the TMD system.

[0034] On-site installation and commissioning: After the tuned mass damper is installed in the designed position, the nut is removed. The metal spring can now move freely. Based on the actual characteristics of the engineering structure and the vibration data measured on site, if there is a deviation from the expected effect and the frequency of the tuned mass damper needs to be adjusted, the nut and upper connecting plate can be removed, and the mass block can be adjusted to match the optimal mass required for vibration control.

[0035] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. A frequency-adjustable modular tuned mass damper, characterized in that: The invention comprises an elastic element assembly (1), wherein the elastic element assembly (1) is located at the four corners of a tuned mass damper product; an adjustment assembly (2), wherein the adjustment assembly (2) is located in the middle of the tuned mass damper product; a damper (3), wherein the damper (3) is located in the center of the adjustment assembly (2); and an upper connecting plate (4) and a lower connecting plate (5), wherein the lower end of the upper connecting plate (4) and the upper end of the lower connecting plate (5) are both fixedly connected to a metal container (6).

2. The frequency-adjustable modular tuned mass damper according to claim 1, characterized in that: The elastic element assembly (1) includes a positioner (7), a metal spring (8), a metal guide rod (9), an oil-free bearing (10), and a nut (11). The positioner (7) is arranged at the four corners of the tuned mass damper product, and the positioner (7) is reliably connected to the adjacent connecting plate; the metal spring (8) is located inside the positioner (7), and the metal spring (8) is reliably connected to the adjacent connecting plate; a metal guide rod (9) is arranged in the middle of the metal spring (8), the metal guide rod (9) passes through the upper end of the upper connecting plate (4) and is threadedly connected to the nut (11), the outer wall of the metal guide rod (9) at the contact position with the upper connecting plate (4) is slidably connected to the oil-free bearing (10), and the outer wall of the oil-free bearing (10) is fixedly connected to the upper connecting plate (4).

3. The frequency-adjustable modular tuned mass damper according to claim 1, characterized in that: The regulating assembly (2) comprises a metal container (6), a plurality of partitions (12) are fixedly connected to the inner wall of the metal container (6), and a mass block (13) is detachably connected between every two partitions (12).

4. The frequency-adjustable modular tuned mass damper according to claim 1, characterized in that: A damper (3) is provided at the inner center of the metal container (6). The damper (3) can be a viscous damper or a cylinder damper, and is provided according to the functional requirements of the product.

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