Vibration reduction device and vibration reduction system

Abstract

The embodiment of the invention provides a damping device and a damping system, and relates to the technical field of bridge construction.The damping device comprises a simple pendulum assembly, a transmission assembly and an inertia mass piece, the pendulum length of the simple pendulum assembly is adjustable, the simple pendulum assembly is rotationally connected with a deck crane, and the transmission assembly is rotationally connected with a pendulum mass piece of the simple pendulum assembly; the inertia mass part is connected with the transmission assembly, and during bridge construction, vibration is transmitted to the deck crane to promote the simple pendulum assembly to swing so as to absorb vibration energy transmitted by the deck crane; the pendulum length of the simple pendulum assembly is increased along with increase of the length of a bridge cantilever, and when the pendulum length of the simple pendulum assembly is adjusted to the maximum value, the pendulum mass piece enables the transmission assembly to output torque to drive the inertia mass piece to rotate so as to absorb vibration energy transmitted by the bridge deck crane. In the embodiment of the invention, the pendulum length adjustment is matched with the inertial mass part, so that the frequency adjustment range of the vibration reduction device is expanded, ultralow-frequency vibration caused by an overlong cantilever in large-span bridge construction is covered, and an overlarge space does not need to be occupied.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a vibration reduction device and vibration reduction system. Background Technology

[0002] With the rapid development of long-span bridge construction, wind-induced vibration control in cantilever construction has become a key technical challenge. Modern bridge structures are trending towards lightweight and flexible designs, making the main beams more susceptible to harmful vibrations under wind loads during construction. This not only affects construction accuracy and personnel safety but may also cause structural damage.

[0003] Since the vibration frequency of a bridge decreases as the bridge span increases, and the elongation or swing arm length of traditional vibration damping devices is inversely proportional to the square of the vibration frequency, the size of the vibration damping devices must be significantly increased for long-span bridges to accommodate their lower vibration frequencies. However, excessive elongation or swing arm length leads to a significant increase in the space occupied by the vibration damping devices, making installation and construction more difficult. Summary of the Invention

[0004] This invention provides a vibration reduction device and a vibration reduction system to solve the technical problem in the related art that traditional vibration reduction devices occupy a large space due to the need to increase the length or extension of the swing arm when constructing long-span bridges.

[0005] In a first aspect, embodiments of the present invention provide a vibration damping device, comprising: A pendulum assembly with adjustable pendulum length, wherein the pendulum assembly is rotatably connected to the bridge deck crane; A transmission assembly, wherein the transmission assembly is rotatably connected to the pendulum mass of the pendulum assembly; An inertial mass component, which is connected to the transmission assembly; During bridge construction, the vibration generated by the bridge under external force is transmitted to the bridge deck crane, causing the single pendulum component to swing in order to absorb the vibration energy transmitted by the bridge deck crane. As the cantilever length of the bridge increases, the pendulum length of the single pendulum component is adjusted. When the pendulum length of the single pendulum component is adjusted to the maximum value, the bridge crane causes the swinging mass to swing, and the swinging mass then causes the transmission component to output torque to drive the inertial mass to rotate, so as to absorb the vibration energy transmitted by the bridge crane.

[0006] In some embodiments, the transmission assembly includes: A connecting shaft passes through the oscillating mass and is rotatable relative to the oscillating mass; A gear, which is sleeved on the outer periphery of the connecting shaft; A rack is located below the gear. When the pendulum length of the pendulum assembly is adjusted to its maximum value, the gear meshes with the rack.

[0007] In some embodiments, the number of inertial mass components is at least two, and the at least two inertial mass components are symmetrically arranged at both ends of the connecting shaft.

[0008] In some embodiments, each of the inertial mass components includes: A disc body, which is fixedly connected to the outer periphery of the connecting shaft; A counterweight, which is slidably disposed along the circumference of the disc body; A locking element is used to fix the position of the counterweight.

[0009] In some embodiments, each of the inertial mass components is detachably connected to the connecting shaft.

[0010] In some embodiments, a guide assembly is further included, the guide assembly being disposed on the side of the oscillating mass member away from the gear, the guide assembly comprising: A roller, which is sleeved on the outer periphery of the connecting shaft; An arc-shaped guide rail is provided under the roller, and the roller and the arc-shaped guide rail form a rolling contact engagement.

[0011] In some embodiments, it also includes: A damping element is disposed between the connecting shaft and the oscillating mass.

[0012] In some embodiments, the pendulum assembly further includes: Ear plate, the ear plate being disposed under the truss of the bridge deck crane; A flexible connector, one end of which is hinged to the ear plate and the other end of which is connected to the swinging mass.

[0013] In some embodiments, the oscillating mass includes at least two detachable counterweights.

[0014] Secondly, embodiments of the present invention provide a vibration reduction system, including the aforementioned vibration reduction device.

[0015] The beneficial effects of the technical solution provided by this invention include: This invention provides a vibration damping device and system. The vibration damping device includes a pendulum assembly, a transmission assembly, and an inertial mass component. The pendulum assembly has an adjustable pendulum length and is rotatably connected to a bridge crane. The transmission assembly is rotatably connected to the pendulum mass component, and the inertial mass component is connected to the transmission assembly. During bridge construction, the vibration generated by the bridge under external forces is transmitted to the bridge crane, causing the pendulum assembly to swing and absorb the vibration energy transmitted by the bridge crane. As the cantilever length of the bridge increases, the pendulum length of the pendulum assembly is increased. When the pendulum length is adjusted to its maximum value, the bridge crane causes the pendulum mass component to swing, and the pendulum mass component then causes the transmission assembly to output torque, driving the inertial mass component to rotate, thereby absorbing the vibration energy transmitted by the bridge crane. In this invention, since the vibration frequency of the bridge gradually decreases with the increase of the bridge length, and the required pendulum length of the pendulum assembly is inversely proportional to the square of the bridge vibration frequency, the pendulum length of the pendulum assembly needs to be increased according to the increase of the bridge length. When the pendulum length of the single pendulum component is adjusted to its maximum value, the pendulum mass component causes the transmission component to output torque, driving the inertial mass component to rotate. This mechanical structure converts the oscillation into rotational motion. The inertial mass generated by the rotation of the inertial mass component effectively reduces the natural frequency of the vibration damping device, adapting to the changed bridge frequency. By adjusting the pendulum length and coordinating with the inertial mass component, the frequency adjustment range of the vibration damping device is expanded, covering ultra-low frequency vibrations caused by excessively long cantilever arms during the construction of long-span bridges. This design eliminates the need for excessive space, facilitating installation and construction. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an overall structure of a vibration damping device provided in an embodiment of the present invention; Figure 2 This is another overall structural schematic diagram of a vibration damping device provided in an embodiment of the present invention; Figure 3 This is a front view of a vibration damping device provided in an embodiment of the present invention; Figure 4 This is an assembly diagram of a vibration damping device provided in an embodiment of the present invention; Figure 5 A front view schematic diagram of an inertial mass component provided in an embodiment of the present invention; Figure 6A side view schematic diagram of an inertial mass component provided in an embodiment of the present invention; Figure label: 1. Simple pendulum assembly; 11. Pendulum mass component; 12. Ear plate; 13. Flexible connector; 2. Transmission assembly; 21. Connecting shaft; 22. Gear; 23. Rack; 3. Inertial mass component; 31. Disc body; 32. Counterweight; 33. Locking component; 4. Bridge deck crane; 41. Truss; 5. Guide assembly; 51. Roller; 52. Curved guide rail. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a vibration reduction device and a vibration reduction system to solve the technical problem in the related art that traditional vibration reduction devices occupy a large space due to the need to increase the length or extension of the swing arm when constructing long-span bridges.

[0020] See Figure 1 and Figure 4As shown in the figure, an embodiment of the present invention provides a vibration damping device, which includes a pendulum assembly 1, a transmission assembly 2, and an inertial mass component 3. The pendulum assembly 1 has an adjustable pendulum length and is rotatably connected to a bridge crane 4. The transmission assembly 2 is rotatably connected to the pendulum mass component 11 of the pendulum assembly 1, and the inertial mass component 3 is connected to the transmission assembly 2. During bridge construction, the vibration generated by the bridge under external force is transmitted to the bridge crane 4, causing the pendulum assembly 1 to swing to absorb the vibration energy transmitted by the bridge crane 4. As the cantilever length of the bridge increases, the pendulum length of the pendulum assembly 1 is increased. When the pendulum length of the pendulum assembly 1 is adjusted to its maximum value, the bridge crane 4 causes the pendulum mass component 11 to swing, and the pendulum mass component 11 then causes the transmission assembly 2 to output torque to drive the inertial mass component 3 to rotate, thereby absorbing the vibration energy transmitted by the bridge crane 4. In this embodiment of the invention, since the vibration frequency of the bridge gradually decreases with the increase of the bridge length, and the required pendulum length of the pendulum component 1 is inversely proportional to the square of the bridge vibration frequency, the pendulum length of the pendulum component 1 needs to be increased according to the increase of the bridge length. When the pendulum length of the pendulum component 1 is adjusted to its maximum value, the pendulum mass component 11 causes the transmission component 2 to output torque to drive the inertial mass component 3 to rotate, that is, the pendulum motion is converted into rotational motion through the mechanical structure. The inertial mass generated by the rotation of the inertial mass component 3 can effectively reduce the natural frequency of the vibration damping device to adapt to the changed bridge frequency. By adjusting the pendulum length and cooperating with the inertial mass component, the frequency adjustment range of the vibration damping device is expanded, covering the ultra-low frequency vibration caused by excessive cantilever length in the construction of long-span bridges, without occupying too much space, which is convenient for installation and construction.

[0021] This invention provides a vibration damping device, comprising a pendulum assembly, a transmission assembly, and an inertial mass component. In this embodiment, since the vibration frequency of a bridge gradually decreases with increasing bridge length, and the required pendulum length is inversely proportional to the square of the bridge's vibration frequency, the pendulum length needs to be increased according to the bridge length. When the pendulum length is adjusted to its maximum value, the pendulum mass component causes the transmission assembly to output torque, driving the inertial mass component to rotate. This mechanical structure converts the oscillation into rotational motion. The inertial mass generated by the rotation of the inertial mass component effectively reduces the natural frequency of the vibration damping device to adapt to the changed bridge frequency. By adjusting the pendulum length and coordinating with the inertial mass component, the frequency adjustment range of the vibration damping device is expanded, covering ultra-low frequency vibrations caused by excessively long cantilever beams during the construction of long-span bridges. This design eliminates the need for excessive space, facilitating installation and construction.

[0022] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 , Figure 2 and Figure 3As shown, the transmission assembly 2 includes a connecting shaft 21, a gear 22, and a rack 23. The connecting shaft 21 passes through the oscillating mass 11 and is rotatable relative to the oscillating mass 11. The gear 22 is sleeved on the outer circumference of the connecting shaft 21, and the rack 23 is located below the gear 22. When the pendulum length of the pendulum assembly 1 is adjusted to its maximum value, the gear 22 meshes with the rack 23. In this embodiment of the invention, the connecting shaft 21, the gear 22, and the rack 23 constitute the transmission assembly 2. The connecting shaft 21, as the core transmission component, maintains relative rotation while passing through the oscillating mass 11. The gear 22 converts the reciprocating oscillation of the oscillating mass 11 into the rotational motion of the connecting shaft 21 by meshing with the rack 23. This meshing transmission method has the characteristics of precise motion conversion and high transmission efficiency. The fixedly set rack 23 not only provides a meshing track for the gear 22 but also maintains transmission stability by limiting the movement path of the gear 22. The transmission component 2 converts low-frequency oscillation energy into rotation through mechanical meshing, which facilitates efficient dissipation of vibration energy. Its rigid transmission characteristics significantly improve response speed and reliability.

[0023] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the number of inertial mass components 3 is at least two, and the at least two inertial mass components 3 are symmetrically arranged at both ends of the connecting shaft 21. In this embodiment of the invention, the at least two inertial mass components 3 at both ends of the connecting shaft 21 are symmetrically arranged. This symmetrical arrangement can effectively balance the rotational inertia, eliminate eccentric vibration caused by unilateral mass, and the synergistic effect of the at least two inertial mass components 3 can amplify the inertial effect. At the same time, this design reduces the rotational inertia requirement of a single inertial mass component 3 through distributed mass configuration, thereby improving vibration reduction efficiency.

[0024] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 5 and Figure 6As shown, each inertial mass component 3 includes a disc 31, a counterweight 32, and a locking component 33. The disc 31 is fixedly connected to the outer periphery of the connecting shaft 21. The counterweight 32 is slidably disposed along the circumference of the disc 31. The locking component 33 is used to fix the position of the counterweight 32. In this embodiment of the invention, the inertial mass component 3 includes a disc 31, a counterweight 32, and a locking component 33. The disc 31 serves as the basic load-bearing structure, and its rigid connection with the connecting shaft 21 ensures the effective transmission of inertial torque. The circumferentially sliding counterweight 32 can change its rotational inertia by changing its radial position. The locking component 33 adopts an anti-loosening structure design, which can maintain the stability of the counterweight under strong vibration conditions. Each inertial mass component 3 formed by the disc 31, the counterweight 32, and the locking component 33 has a large inertia adjustment range. Different vibration frequency requirements can be met simply by adjusting the position of the counterweight, greatly improving the adaptability of the vibration damping device.

[0025] As an optional implementation, in one embodiment of the invention, each of the inertial mass components 3 is detachably connected to the connecting shaft 21. In this embodiment, the detachable connection between the inertial mass component 3 and the connecting shaft 21 ensures the reliability of power transmission and allows for independent replacement or addition / reduction of individual inertial mass components 3. In actual operation, different numbers or specifications of inertial mass components 3 can be flexibly combined according to the actual vibration frequency requirements. Maintenance does not require a complete shutdown, significantly improving maintenance efficiency and realizing modular configuration and rapid maintenance of the vibration damping device.

[0026] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the vibration damping device further includes a guide assembly 5, which is located on the side of the swinging mass 11 away from the gear 22. The guide assembly 5 includes a roller 51 and an arc-shaped guide rail 52. The roller 51 is sleeved on the outer periphery of the connecting shaft 21, and the arc-shaped guide rail 52 is located below the roller 51, forming a rolling contact engagement between the roller 51 and the arc-shaped guide rail 52. In this embodiment of the invention, the roller 51 and the arc-shaped guide rail 52 in the guide assembly 5 are precisely matched, providing a crucial guarantee for the motion stability of the vibration damping device. The radius of curvature of the arc-shaped guide rail 52 matches the motion trajectory of the swinging mass 11, ensuring that the gear 22 and the rack 23 always maintain the optimal meshing clearance. At the same time, arranging the guide assembly 5 on the side of the swinging mass 11 away from the gear 22 forms a "gear-roller" double-pivot constraint structure, which can effectively suppress the deflection caused by meshing impact. Moreover, the guide assembly has a simple structure, compact layout, and high stability.

[0027] As an optional implementation, in one embodiment of the invention, the vibration damping device further includes a damping element disposed between the connecting shaft 21 and the oscillating mass 11. In this embodiment of the invention, one of viscous damping, frictional damping, or eddy current damping is employed to achieve efficient dissipation of vibration energy, further improving the reliability of the vibration damping device.

[0028] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, the single pendulum assembly 1 also includes an ear plate 12 and a flexible connector 13. The ear plate 12 is disposed under the truss 41 of the bridge crane 4. One end of the flexible connector 13 is hinged to the ear plate 12, and the other end is connected to the pendulum mass 11. In this embodiment of the invention, the ear plate 12 and the flexible connector 13 of the single pendulum assembly 1 cooperate to achieve efficient transmission of vibration energy. The ear plate 12 is welded to the truss 41 of the bridge crane 4 to form a stable vibration transmission interface. The flexible connector 13 is connected to the ear plate 12 by hinge and is also connected to the pendulum mass 11. The vibration transmission efficiency is high, and the elastic deformation of the flexible connector 13 can absorb part of the impact load, greatly reducing the fatigue risk and extending the service life.

[0029] As an optional implementation, in one embodiment of the invention, the swing mass 11 is provided with at least two detachable counterweights. In this embodiment of the invention, the swing mass 11 has detachable counterweights, which improves ease of use and flexibility.

[0030] This invention also provides a vibration reduction system, which includes the aforementioned vibration reduction device. The vibration reduction device includes a pendulum assembly 1, a transmission assembly 2, and an inertial mass component 3. The pendulum assembly 1 has an adjustable pendulum length and is rotatably connected to a bridge crane 4. The transmission assembly 2 is rotatably connected to the pendulum mass component 11 of the pendulum assembly 1, and the inertial mass component 3 is connected to the transmission assembly 2. During bridge construction, the vibration generated by the bridge under external force is transmitted to the bridge crane 4, causing the pendulum assembly 1 to swing to absorb the vibration energy transmitted by the bridge crane 4. As the cantilever length of the bridge increases, the pendulum length of the pendulum assembly 1 is increased. When the pendulum length of the pendulum assembly 1 is adjusted to its maximum value, the bridge crane 4 causes the pendulum mass component 11 to swing. The pendulum mass component 11 then causes the transmission assembly 2 to output torque to drive the inertial mass component 3 to rotate, thereby absorbing the vibration energy transmitted by the bridge crane 4.

[0031] In this embodiment of the invention, since the vibration frequency of the bridge gradually decreases with the increase of the bridge length, and the required pendulum length of the pendulum component 1 is inversely proportional to the square of the bridge vibration frequency, the pendulum length of the pendulum component 1 needs to be increased according to the increase of the bridge length. When the pendulum length of the pendulum component 1 is adjusted to its maximum value, the pendulum mass component 11 causes the transmission component 2 to output torque to drive the inertial mass component 3 to rotate, that is, the pendulum motion is converted into rotational motion through the mechanical structure. The inertial mass generated by the rotation of the inertial mass component 3 can effectively reduce the natural frequency of the vibration damping device to adapt to the changed bridge frequency. By adjusting the pendulum length and cooperating with the inertial mass component, the frequency adjustment range of the vibration damping device is expanded, covering the ultra-low frequency vibration caused by excessive cantilever length in the construction of long-span bridges, without occupying too much space, which is convenient for installation and construction.

[0032] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 , Figure 2 and Figure 3 As shown, the transmission assembly 2 includes a connecting shaft 21, a gear 22, and a rack 23. The connecting shaft 21 passes through the oscillating mass 11 and is rotatable relative to the oscillating mass 11. The gear 22 is sleeved on the outer circumference of the connecting shaft 21, and the rack 23 is located below the gear 22. When the pendulum length of the pendulum assembly 1 is adjusted to its maximum value, the gear 22 meshes with the rack 23. In this embodiment of the invention, the connecting shaft 21, the gear 22, and the rack 23 constitute the transmission assembly 2. The connecting shaft 21, as the core transmission component, maintains relative rotation while passing through the oscillating mass 11. The gear 22 converts the reciprocating oscillation of the oscillating mass 11 into the rotational motion of the connecting shaft 21 by meshing with the rack 23. This meshing transmission method has the characteristics of precise motion conversion and high transmission efficiency. The fixedly set rack 23 not only provides a meshing track for the gear 22 but also maintains transmission stability by limiting the movement path of the gear 22. The transmission component 2 converts low-frequency oscillation energy into rotation through mechanical meshing, which facilitates efficient dissipation of vibration energy. Its rigid transmission characteristics significantly improve response speed and reliability.

[0033] The vibration damping device provided in this embodiment of the invention has the following working principle: Bridge cantilever construction begins, and bridge deck crane 4 is installed on the bridge deck. At this time, the bridge cantilever length is relatively short, and the bridge's natural frequency is relatively high. The vibration energy can be absorbed solely by the swing of the single pendulum component 1. According to the measured bridge natural frequency f_ 桥 The required pendulum length *l* is determined using the following formula:

[0034] In the formula, g is the acceleration due to gravity.

[0035] As construction progresses, the cantilever length of the bridge increases, and the bridge's natural frequency f_ 桥 By continuously decreasing the length of the pendulum (l) and increasing it, the natural frequency (f) of the bridge can be adapted to the changes in the pendulum's frequency. 桥 ; Bridge natural frequency f 桥 Further reduction leads to the pendulum length reaching its maximum value. max When the gear 22 contacts the rack 23, an inertial mass component 3 is introduced. The formula for calculating the vibration damping device frequency f is as follows:

[0036] In the formula, m is the oscillating mass, which is the total mass of the inertial mass component 3, the oscillating mass component 11, the gear 22, the roller 51, and the connecting shaft 21. δm is the inertial mass provided by the rotation of the inertial mass component 3, and the calculation formula is as follows:

[0037] In the formula, R is the radius of disk body 31, m 31 Where is the physical mass of disc 31, r is the radius of gear 22, n is the number of counterweights 32, D is the distance between the center of mass of counterweight 32 and the center of the connecting shaft 21, and m is the distance between the center of mass of counterweight 32 and the center of the connecting shaft 21. 32 It is the physical mass of counterweight 32.

[0038] Therefore, increasing the inertial mass δm can further reduce the frequency of the vibration damping device to meet the ultra-low frequency vibration damping requirements of bridges. δm can be adjusted by changing the radius R of the inertial mass component 3 and other measures to quickly adjust to the required frequency.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0040] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A vibration damping device, characterized in that, include: A pendulum assembly (1) with adjustable pendulum length, wherein the pendulum assembly (1) is rotatably connected to the bridge deck crane (4); Transmission assembly (2), which is rotatably connected to the pendulum assembly (1) of the pendulum assembly (1); An inertial mass component (3) is connected to the transmission assembly (2); During bridge construction, the vibration generated by the bridge under the action of external force is transmitted to the bridge deck crane (4), causing the single pendulum component (1) to swing to absorb the vibration energy transmitted by the bridge deck crane (4); As the length of the bridge cantilever increases, the pendulum length of the pendulum assembly (1) is adjusted. When the pendulum length of the pendulum assembly (1) is adjusted to the maximum value, the bridge deck crane (4) causes the swing mass component (11) to swing. The swing mass component (11) then causes the transmission assembly (2) to output torque to drive the inertial mass component (3) to rotate, so as to absorb the vibration energy transmitted by the bridge deck crane (4).

2. The vibration damping device according to claim 1, characterized in that, The transmission assembly (2) includes: A connecting shaft (21) passes through the swing mass (11) and is rotatable relative to the swing mass (11); Gear (22), the gear (22) being sleeved on the outer periphery of the connecting shaft (21); A rack (23) is located below the gear (22). When the pendulum length of the pendulum assembly (1) is adjusted to the maximum value, the gear (22) meshes with the rack (23).

3. The vibration damping device according to claim 2, characterized in that: The number of the inertial mass components (3) is at least two, and the at least two inertial mass components (3) are symmetrically arranged at both ends of the connecting shaft (21).

4. A vibration damping device according to claim 3, characterized in that, Each of the aforementioned inertial mass components (3) includes: The disc body (31) is fixedly connected to the outer periphery of the connecting shaft (21); A counterweight (32) is slidably disposed along the circumference of the disc body (31); Locking element (33) is used to fix the position of the counterweight (32).

5. A vibration damping device according to claim 3, characterized in that: Each of the inertial mass components (3) is detachably connected to the connecting shaft (21).

6. A vibration damping device according to claim 2, characterized in that, It also includes a guide assembly (5), which is disposed on the side of the oscillating mass (11) away from the gear (22), and the guide assembly (5) includes: Roller (51), the roller (51) is sleeved on the outer periphery of the connecting shaft (21); An arc-shaped guide rail (52) is provided under the roller (51), and the roller (51) and the arc-shaped guide rail (52) form a rolling contact engagement.

7. A vibration damping device according to claim 2, characterized in that, Also includes: A damping element is disposed between the connecting shaft (21) and the oscillating mass (11).

8. A vibration damping device according to claim 1, characterized in that, The pendulum assembly (1) further includes: Ear plate (12), the ear plate (12) is located under the truss (41) of the bridge deck crane (4); A flexible connector (13) is provided, with one end of the flexible connector (13) hinged to the ear plate (12) and the other end connected to the swing mass (11).

9. A vibration damping device according to claim 1, characterized in that: The swing mass (11) includes at least two detachable counterweights.

10. A vibration reduction system, characterized in that, The device includes a vibration damping device as described in any one of claims 1-9.

Images