Damping device for stay cable, damping system and cable-stayed bridge

Abstract

The application relates to a damping device for a stay cable, a damping system and a cable-stayed bridge. The damping device comprises a mounting lock piece, a spring damper and an amplitude adjustment assembly. The amplitude adjustment assembly comprises a hydraulic damper and an amplitude adjustment damper. When the vibration amplitude of the stay cable is small, only the spring damper works, and the spring damper outputs an original elastic damping force with an original amplitude. When the vibration amplitude of the stay cable increases, the stay cable touches and presses the hydraulic damper, on one hand, the hydraulic damper directly applies a second damping force, and on the other hand, the amplitude adjustment damper compresses the spring damper, reduces the amplitude of the spring damper, increases the elastic damping force of the spring damper, and forms double damping control of the hydraulic damping force and the spring damping force. The compression amount of the amplitude adjustment damper to the spring damper is positively correlated with the vibration amplitude of the stay cable, so that the damping force and the vibration energy demand are matched under different large amplitude vibration conditions, and the damping force adjustment is more stable.

Description

Technical Field

[0001] This application relates to the field of bridge technology, and in particular to vibration damping devices, vibration damping systems and cable-stayed bridges for cable stays. Background Technology

[0002] Cable-stayed bridges and suspension bridges, which use flexible stay cables as load-transmitting components, have stay cables that combine high flexibility with low damping, serving as the main structure for load transfer. During actual operation, the stay cables are constantly subjected to minute vibrations induced by wind and rain, dynamic loads from vehicle traffic, etc. These vibrations continuously act on the cable anchorage, leading to deterioration of the anchorage's fatigue characteristics.

[0003] Currently, vibration reduction methods for cable-stayed bridge cables mainly involve damping control, which directly regulates vibration by installing damping devices on the cables, such as viscous dampers, magnetorheological fluid dampers, and lever dampers. The vibration energy is dissipated through the direct interaction between the external damping structure and the cable. To further improve vibration reduction adaptability, staged vibration reduction schemes have emerged in existing technologies. For example, patent CN110409287B discloses a symmetrical hydraulic circuit cable damping device including a spring damper. The spring achieves initial damping; when the cable vibration amplitude exceeds the spring's damping range, the symmetrically arranged magnetorheological fluid hydraulic circuit is activated for secondary damping; if the vibration amplitude exceeds the hydraulic damping's tolerance, the magnetorheological fluid is magnetized to exert its damping effect, achieving a third level of vibration reduction.

[0004] However, in the solution described in this patent, the magnetic fields sensed by the two opposing magnetorheological hydraulic cylinders are different, and the magnetorheological fluids within the two opposing cylinders are connected, resulting in different viscosities of the hydraulic oil in the same connected space, leading to poor damping stability. To maintain stable damping, the damping force of the magnetorheological damper can be adjusted by current input control; however, this method relies on electronic control, and in the event of a power outage, the damper will lose its active adjustment capability.

[0005] In summary, current cable-stayed bridge vibration reduction technology still has shortcomings in terms of damping performance and controllability. There is an urgent need for a cable vibration reduction scheme with good damping control and stability to address the deficiencies of existing technologies. Summary of the Invention

[0006] Therefore, it is necessary to provide a vibration damping device, vibration damping system, and cable-stayed bridge for cable stays in response to the above problems.

[0007] A vibration damping device for a stay cable includes a mounting lock, a spring damper, and an amplitude adjustment assembly. The mounting lock has an installation space for the stay cable to pass through. The spring damper is disposed within the installation space and abuts against the stay cable. The amplitude adjustment assembly includes a hydraulic damper and an amplitude adjustment damper. The end of the spring damper facing away from the stay cable is mounted on the inner wall of the mounting lock via the amplitude adjustment damper. The hydraulic damper is mounted on the inner wall of the mounting lock and spaced apart from the stay cable, with the distance between the hydraulic damper and the stay cable being less than the maximum compression of the spring damper. When the hydraulic damper is subjected to pressure away from the stay cable, it triggers the amplitude adjustment damper to compress the spring damper in the direction of the spring damper.

[0008] In one embodiment, the hydraulic damper includes a first hydraulic cylinder, a first piston, and a compression push rod. The first hydraulic cylinder is mounted on the inner wall of the mounting locking member, and the first piston is disposed inside the first hydraulic cylinder. One end of the compression push rod is connected to the first piston, and the other end extends out of the first hydraulic cylinder and is spaced apart from the cable. The amplitude adjustment damper includes a second hydraulic cylinder, a second piston, and an adjustment push rod. The second hydraulic cylinder is mounted on the inner wall of the mounting locking member, and the second piston is disposed inside the second hydraulic cylinder. One end of the adjustment push rod is connected to the second piston, and the other end extends out of the second hydraulic cylinder and is connected to the spring damper.

[0009] In one embodiment, the rodless space in the first hydraulic cylinder and the rodless space in the second hydraulic cylinder are connected by an inlet channel and an outlet channel. The inlet channel is provided with a first check valve that allows liquid to flow from the first hydraulic cylinder to the second hydraulic cylinder, and the outlet channel is provided with a second check valve that allows liquid to flow from the second hydraulic cylinder to the first hydraulic cylinder. The cross-sectional dimension of the inlet channel is larger than that of the outlet channel.

[0010] In one embodiment, the cross-sectional dimension of the first hydraulic cylinder is smaller than that of the second hydraulic cylinder. The second piston is provided with a first damping flow valve and a second damping flow valve arranged at intervals. The first damping flow valve is used to allow the liquid in the rod space of the second hydraulic cylinder to flow unidirectionally to the rodless space, and the second damping flow valve is used to allow the liquid in the rodless space of the second hydraulic cylinder to flow unidirectionally to the rod space. The cross-sectional dimension of the flow channel of the first damping flow valve is larger than that of the flow channel of the second damping flow valve.

[0011] In one embodiment, the spring damper includes a damping spring and an amplitude adjustment plate. One end of the damping spring is connected to the amplitude adjustment plate, and the other end abuts against the cable. The end of the adjusting push rod away from the second piston is installed on the side of the amplitude adjustment plate facing away from the damping spring. The amplitude adjustment plate is also provided with a sliding hole communicating with the inner space of the damping spring. The hydraulic damper passes through the sliding hole so that the other end of the compression push rod is located inside the damping spring, and the adjusting push rod can push the amplitude adjustment plate to slide relative to the hydraulic damper.

[0012] In one embodiment, the hydraulic damper further includes a guide rod, and the end of the compression push rod facing away from the first piston has a guide hole. One end of the guide rod is slidably inserted into the guide hole, and the other end is located in the damping spring and can abut against the cable.

[0013] In one embodiment, there are multiple spring dampers, which are spaced apart around the axis of the stay cable. Each spring damper is provided with at least two amplitude adjustment components, which are spaced apart along the axis of the stay cable. Each spring damper includes at least two damping springs, which are spaced apart along the axis of the stay cable.

[0014] A vibration damping system for stay cables includes at least two vibration damping devices as described above and a connecting device. The opposite ends of the connecting device are respectively mounted on the mounting locks of the two vibration damping devices. The two vibration damping devices are respectively mounted on different stay cables, and the connecting device is capable of adjusting the distance between the two vibration damping devices.

[0015] In one embodiment, the connecting device includes an adjusting sleeve and two connecting rods. One end of each connecting rod is rotatably connected to the outer wall of the mounting lock of the two vibration damping devices, and the other end of each connecting rod can be telescopically inserted into the adjusting sleeve. The connecting rod is an elastic rod, and the elastic force of the connecting rod is in the direction from one connecting rod to the other.

[0016] In one embodiment, the vibration damping device further includes a cable sleeve slidably fitted onto the stay cable, with one end of the spring damper away from the amplitude adjusting damper mounted on the cable sleeve.

[0017] The aforementioned vibration damping device and system for stay cables, when the amplitude of cable vibration is small, relies solely on the spring damper without the need for additional hydraulic damping. In this case, the spring damper outputs its original elastic damping force at its original amplitude, ensuring effective suppression of small-amplitude vibrations while avoiding ineffective operation of the hydraulic damper. When the amplitude of cable vibration increases and the cable contacts and presses against the hydraulic damper, the hydraulic damper directly applies a second damping force to weaken the large-amplitude vibration kinetic energy of the cable. Simultaneously, it drives the amplitude adjustment damper to actively compress the spring damper, reducing its amplitude and increasing its elastic damping force. This creates a dual vibration damping control effect through enhanced hydraulic and spring damping forces, improving the overall vibration reduction performance of the stay cables.

[0018] The compression of the spring damper by the amplitude adjustment damper is positively correlated with the vibration amplitude of the cable. The greater the vibration amplitude of the cable, the greater the compression triggered by the hydraulic damper, the more significant the reduction in the amplitude of the spring damper, and the greater the increase in the elastic damping force. This ensures that the damping force always matches the vibration energy demand under different vibration amplitude conditions. Compared with the existing magnetorheological fluid dampers, which suffer from damping force fluctuations due to magnetic field inhomogeneity, the damping force adjustment in this application is more stable.

[0019] A cable-stayed bridge includes stay cables and a vibration damping system as described above, the vibration damping system being installed on the stay cables. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown in the drawings only as examples and not necessarily to actual scale.

[0023] Figure 1 This is a front sectional view of a vibration damping device for a stay cable in one embodiment, in a state of use.

[0024] Figure 2 for Figure 1 Side view of the vibration damping device shown.

[0025] Figure 3 for Figure 1Enlarged view of point A in the middle.

[0026] Figure 4 This is a front sectional view of the vibration damping device in another embodiment under another usage condition.

[0027] Figure 5 for Figure 4 Side view of the vibration damping device shown.

[0028] Figure 6 for Figure 4 Enlarged view of point B in the middle.

[0029] Figure 7 This is a front view of a vibration damping system for stay cables in one embodiment.

[0030] Figure 8 This is a schematic diagram of the structure of a cable-stayed bridge in one embodiment.

[0031] Explanation of reference numerals in the attached figures:

[0032] Vibration damping system 1; vibration damping device 10; mounting lock 100; installation space 110; spring damper 200; damping spring 210; amplitude adjustment plate 220; sliding hole 221; amplitude adjustment assembly 300; hydraulic damper 310; first hydraulic cylinder 311; first piston 312; compression push rod 313; guide rod 314; guide hole 315; amplitude adjustment damper 320; second hydraulic cylinder 321; second piston 322; adjustment push rod 323; liquid inlet channel 330; liquid outlet channel 340; cable sleeve 400; ball bearing 410; stay cable 20; connecting device 30; adjusting sleeve 302; connecting rod 304. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] See Figures 1 to 3The vibration damping device 10 for a stay cable in one embodiment of this application can at least improve the stability of damping adjustment. Specifically, the vibration damping device 10 includes a mounting lock 100, a spring damper 200, and an amplitude adjustment assembly 300. The mounting lock 100 has an installation space 110 for the stay cable 20 to pass through. The spring damper 200 is disposed in the installation space 110 and is used to abut against the stay cable 20. The amplitude adjustment assembly 300 includes a hydraulic damper 310 and an amplitude adjustment damper 320. The end of the spring damper 200 facing away from the stay cable 20 is mounted on the inner wall of the mounting lock 100 through the amplitude adjustment damper 320. The hydraulic damper 310 is mounted on the inner wall of the mounting lock 100 and spaced apart from the stay cable 20, and the distance between the hydraulic damper 310 and the stay cable 20 is less than the maximum compression of the spring damper 200. When the hydraulic damper 310 is subjected to pressure in a direction away from the cable 20, it triggers the amplitude adjustment damper 320 to compress the spring damper 200 in the direction of the spring damper 200.

[0035] See also Figure 3 and Figure 4 In this application, when the vibration damping device 10 is in use, if the vibration amplitude of the stay cable 20 is small, it only relies on the spring damper 200 to work, without the need to additionally trigger the hydraulic damper 310. At this time, the spring damper 200 outputs the original elastic damping force with the original amplitude, which not only ensures effective suppression of small-amplitude vibrations, but also avoids the ineffective action of the hydraulic damper 310. When the vibration amplitude of the stay cable 20 increases, and the stay cable 20 touches and presses against the hydraulic damper 310, on the one hand, the hydraulic damper 310 directly applies a second damping force to weaken the large-amplitude vibration kinetic energy of the stay cable 20, and on the other hand, drives the amplitude adjustment damper 320 to actively compress the spring damper 200, reducing the amplitude of the spring damper 200 and increasing its elastic damping force. This forms a dual vibration damping control of hydraulic damping force and spring damping force, improving the vibration damping effect on the stay cable 20.

[0036] The compression of the spring damper 200 by the amplitude adjustment damper 320 is positively correlated with the vibration amplitude of the cable 20. The greater the vibration amplitude of the cable 20, the greater the compression triggered by the hydraulic damper 310, the more significant the reduction in the amplitude of the spring damper 200, and the greater the increase in the elastic damping force. This ensures that the damping force always matches the vibration energy demand under different vibration conditions. Compared with the existing magnetorheological fluid dampers, which suffer from damping force fluctuations due to magnetic field inhomogeneity, the damping force adjustment in this application is more stable.

[0037] See Figure 1 , Figure 3 , Figure 4 and Figure 6In one embodiment, the hydraulic damper 310 includes a first hydraulic cylinder 311, a first piston 312, and a compression push rod 313. The first hydraulic cylinder 311 is mounted on the inner wall of the mounting locking member 100. The first piston 312 is disposed inside the first hydraulic cylinder 311. One end of the compression push rod 313 is connected to the first piston 312, and the other end extends out of the first hydraulic cylinder 311 and is spaced apart from the cable 20. The amplitude adjustment damper 320 includes a second hydraulic cylinder 321, a second piston 322, and an adjustment push rod 323. The second hydraulic cylinder 321 is mounted on the inner wall of the mounting locking member 100. The second piston 322 is disposed inside the second hydraulic cylinder 321. One end of the adjustment push rod 323 is connected to the second piston 322, and the other end extends out of the second hydraulic cylinder 321 and is connected to the spring damper 200. The rodless space in the first hydraulic cylinder 311 and the rodless space in the second hydraulic cylinder 321 are connected by an inlet channel 330 and an outlet channel 340. A first check valve is provided in the inlet channel 330 to allow liquid to flow from the first hydraulic cylinder 311 to the second hydraulic cylinder 321. A second check valve is provided in the outlet channel 340 to allow liquid to flow from the second hydraulic cylinder 321 to the first hydraulic cylinder 311. The cross-sectional dimension of the inlet channel 330 is larger than that of the outlet channel 340.

[0038] In traditional vibration reduction schemes using magnetorheological fluid (MRF) dampers, controlling damping changes by varying magnet positions presents several challenges. First, the constantly changing magnet positions lead to differences in the induced magnetic fields of the two opposing MRF dampers. Second, since the hydraulic oil in the two dampers is connected, these magnetic field differences cause uneven magnetization of the MRF within the same connected space, resulting in inconsistent hydraulic oil viscosity distribution. When cable vibration drives the hydraulic oil flow, this uneven viscosity causes fluctuations in damping force, preventing stable vibration reduction. This instability, especially under medium-amplitude vibrations, can exacerbate the cable's vibration response and even trigger additional vibrations in the damping device itself. If the MRF damper is controlled electrically to stabilize damping changes, a power outage can prevent the excitation coil from receiving current, causing the MRF to lose its active control capability and operate only in a low-damping, passive state. Faced with large vibrations caused by sudden loads such as strong winds and earthquakes, the cable 20 cannot provide effective damping, and is prone to running into an uncontrolled vibration state. At the same time, triggering vibration reduction control requires the configuration of vibration sensors and feedback control systems. The accuracy of the sensors and the response speed of the control system directly affect the control effect. Moreover, the complex system not only increases costs but also increases the probability of failure.

[0039] In this application, when the vibration amplitude of the stay cable 20 increases, the compression push rod 313 is triggered to push the first piston 312 into the rodless space, compressing the liquid in the rodless space of the first hydraulic cylinder 311 through the inlet channel 330 into the rodless space of the second hydraulic cylinder 321, thereby pushing the second piston 322 to drive the adjusting push rod 323 to compress the spring damper 200. When the stay cable 20 releases its pressure on the compression push rod 313, under the restoring force of the spring damper 200, the adjusting push rod 323 will push the second piston 322 to move and reset towards the rodless space, so that the liquid in the second hydraulic cylinder 321 enters the first hydraulic cylinder 311. Through the control of the first and second check valves, and because the cross-sectional size of the inlet channel 330 is larger than the cross-sectional size of the outlet channel 340, the discharge speed of the rodless space of the second hydraulic cylinder 321 is much smaller than the inlet speed. The large-section inlet channel 330 ensures rapid enhancement of the damping force of the spring damper 200 during high-frequency, high-amplitude vibrations. When the vibration amplitude of the stay cable 20 decreases, the spring damper 200 pushes the second piston 322 to reset. The liquid needs to slowly flow back to the first hydraulic cylinder 311 through the small-section outlet channel 340. This process significantly reduces the reset speed of the spring damper 200, and its elastic damping force gradually decreases from the enhanced state rather than being suddenly unloaded. This slow reset process maintains the continuity of the damping force and avoids secondary vibration of the stay cable 20 or stress impact on the anchorage due to sudden changes in damping force. At the same time, the solution of this application adopts pure mechanical triggering, without relying on external electrical energy or complex sensor control systems, improving the adaptability and reliability of the vibration damping device 10 in complex outdoor environments.

[0040] In this embodiment, the cross-sectional dimension of the liquid outlet channel 340 can be 1mm-5mm, and the cross-sectional dimension of the liquid inlet channel 330 can be 5mm-20mm. For example, the cross-sectional dimension of the liquid outlet channel 340 can be selected as 2mm, and the cross-sectional dimension of the liquid inlet channel 330 can be selected as 15mm to ensure that the damping force can be rapidly enhanced during large-amplitude vibrations. When the vibration amplitude of the cable 20 decreases, the spring damper 200 pushes the second piston 322 to reset, and the liquid needs to slowly flow back to the first hydraulic cylinder 311 through the small-section liquid outlet channel 340. This process significantly reduces the reset speed of the spring damper 200, allowing its elastic damping force to decay smoothly.

[0041] In one embodiment, the cross-sectional dimension of the first hydraulic cylinder 311 is smaller than that of the second hydraulic cylinder 321. The second piston 322 is provided with a first damping flow valve 324 and a second damping flow valve 325 arranged at intervals. The first damping flow valve 324 allows unidirectional flow of liquid from the rod-side space within the second hydraulic cylinder 321 to the rodless space, and the second damping flow valve 325 allows unidirectional flow of liquid from the rodless space within the second hydraulic cylinder 321 to the rod-side space. Specifically, the cross-sectional dimension of the flow channel of the first damping flow valve 324 is larger than that of the second damping flow valve 325. Optionally, the damping force of the first damping flow valve 324 is less than the damping force of the second damping flow valve 325. Further, the movement of the compression push rod 313 is greater than or equal to the movement of the adjusting push rod 323.

[0042] When the amplitude of the stay cable 20 increases, requiring compression of the spring damper 200, the fluid in the second hydraulic cylinder 321 flows only along the direction from the rod-side space to the rodless space. Due to the large channel size and low flow resistance of the first damping valve 324, the fluid flow rate is high, allowing the second piston 322 to quickly respond to the thrust and complete the compression action on the spring damper 200. This ensures that the spring damper 200 promptly increases its elastic damping force, suppressing the vibration of the stay cable 20. When the vibration of the stay cable 20 decreases and the system resets, the fluid in the second hydraulic cylinder 321 flows back only along the direction from the rodless space to the rod-side space. Due to the small channel size and high flow resistance of the second damping valve 325, the fluid flow rate is slow, significantly slowing the reset speed of the second piston 322. This allows the damping force to continuously match the residual vibration of the stay cable 20, preventing fluctuations in the damping effect during reset and improving the dynamic adaptability of the damping adjustment. In this embodiment, the hydraulic oil in the first hydraulic cylinder 311 and the second hydraulic cylinder 321 is a liquid with a certain viscosity, which can provide a certain flow damping effect.

[0043] In another embodiment, a first damping flow valve and a second damping flow valve may also be provided on the first piston 312. The first damping flow valve is used to allow the liquid in the rodless space of the first hydraulic cylinder 311 to flow unidirectionally to the rod space, and the second damping flow valve is used to allow the liquid in the rod space of the first hydraulic cylinder 311 to flow unidirectionally to the rodless space. The cross-sectional dimension of the flow channel of the first damping flow valve is larger than the cross-sectional dimension of the second damping flow valve. In other embodiments, a return spring may also be provided in the rod space of the first hydraulic cylinder 311 to ensure the reset effect of the first piston 312, thereby ensuring the reset effect of the second piston 322.

[0044] In one embodiment, a buffer pad may be provided on the end of the compression push rod 313 facing the cable 20 to protect the compression push rod 313.

[0045] In one embodiment, the spring damper 200 includes a damping spring 210 and an amplitude adjusting plate 220. One end of the damping spring 210 is connected to the amplitude adjusting plate 220, and the other end abuts against the cable 20. The end of the adjusting push rod 323 away from the second piston 322 is installed on the side of the amplitude adjusting plate 220 facing away from the damping spring 210. The amplitude adjusting plate 220 is also provided with a sliding hole 221 communicating with the inner space of the damping spring 210. The hydraulic damper 310 passes through the sliding hole 221 so that the other end of the compression push rod 313 is located inside the damping spring 210, and the adjusting push rod 323 can push the amplitude adjusting plate 220 to slide relative to the hydraulic damper 310. Because the installation space 110 for the locking fastener 100 is relatively narrow, the hydraulic damper 310 is inserted into the sliding hole 221 of the amplitude adjustment plate 220, making the hydraulic damper 310 and the damping spring 210 coaxial or nearly coaxial. This eliminates the need for additional independent installation space 110 for the compression push rod 313. The compression push rod 313 is built into the damping spring 210. When the vibration of the stay cable 20 increases, it can promptly contact the compression push rod 313, triggering the second damping force of the hydraulic damper 310. Simultaneously, the amplitude adjustment plate 220 effectively achieves a stable connection between the adjustment push rod 323 and the damping spring 210, ensuring that the thrust of the compression push rod 313 effectively acts on the damping spring 210.

[0046] In this embodiment, the amplitude adjustment plate 220 is an arc-shaped plate arranged around the axis of the cable 20.

[0047] Specifically, the hydraulic damper 310 also includes a guide rod 314. A guide hole 315 is provided at the end of the compression push rod 313 facing away from the first piston 312. One end of the guide rod 314 slidably passes through the guide hole 315, and the other end is located within the damping spring 210 and can abut against the stay cable 20. By providing the guide rod 314, the compression or extension of the damping spring 210 can be guided, and the process of the stay cable 20 vibrating and triggering the hydraulic damper 310 can also be guided, improving the accuracy and reliability of damping adjustment. In other embodiments, the guide rod 314 may be omitted.

[0048] See Figure 1 , Figure 2 and Figure 5In one embodiment, multiple spring dampers 200 are provided, spaced apart around the axis of the stay cable 20. Each spring damper 200 is provided with at least two amplitude adjustment components 300, which are spaced apart along the axial direction of the stay cable 20. Specifically, each spring damper 200 includes at least two damping springs 210, which are spaced apart along the axial direction of the stay cable 20. By providing multiple spring dampers 200 matched with multiple amplitude adjustment components 300, vibration control of the stay cable 20 can be achieved throughout its entire circumference. Furthermore, by arranging multiple damping springs 210 along the axial direction of the stay cable 20, the damping area of ​​the stay cable 20 can be extended, thereby improving the vibration damping effect.

[0049] For example, each spring damper 200 includes three damping springs 210, which are spaced apart. Each spring damper 200 is provided with three amplitude adjustment components 300, and each amplitude adjustment component 300 is provided at one damping spring 210.

[0050] like Figure 1 and Figure 4 As shown, in one embodiment, the vibration damping device 10 further includes a cable sleeve 400, which is slidably fitted onto the stay cable 20. The end of the spring damper 200 away from the amplitude adjustment damper 320 is mounted on the cable sleeve 400. The cable sleeve 400 facilitates the interaction between the spring damper 200 and the stay cable 20, and also allows for the installation and adjustment of the vibration damping device 10 at different positions on the stay cable 20.

[0051] In one embodiment, the cable sleeve 400 and the stay cable 20 are fitted with a gap. On the one hand, the cable sleeve 400 can slide on the stay cable 20 with a small frictional resistance. On the other hand, when the stay cable 20 is affected by temperature and undergoes thermal expansion and contraction, it can provide room for the change of the stay cable 20.

[0052] In one embodiment, a plurality of rotatable balls 410 are provided on the inner wall of the cable sleeve 400. The balls 410 abut against the outer wall of the cable 20 to reduce the friction of the cable sleeve 400 sliding on the cable 20.

[0053] See Figure 1 and Figure 7In one embodiment, this application also describes a vibration damping system 1 for stay cables. The vibration damping system 1 includes a vibration damping device 10 and a connecting device 30 as described in any of the above embodiments. The opposite ends of the connecting device 30 are respectively mounted on the mounting locking members 100 of the two vibration damping devices 10, and the two vibration damping devices 10 are respectively mounted on different stay cables 20. At least two stay cables 20 can be interconnected through the connecting device 30. Since the arrangement positions of each stay cable 20 are different, the vibrations experienced by different stay cables 20 are different. A single stay cable 20 is prone to continuous resonance due to wind and rain excitation, vehicle impact, etc. The connecting device 30 will transfer some of the vibration energy to the stay cable 20 connected to it, avoiding energy in a single cable. Moreover, the connecting device 30 can limit the vibration amplitude of a single cable through stiffness constraints and damping energy dissipation.

[0054] In one embodiment, the connecting device 30 can adjust the spacing between the two vibration damping devices 10. Specifically, the connecting device 30 includes an adjusting sleeve 302 and two connecting rods 304. One end of each connecting rod 304 is rotatably connected to the outer wall of the mounting locking member 100 of the two vibration damping devices 10, and the other end of each connecting rod 304 can be telescopically inserted into the adjusting sleeve 302. Further, the connecting rods 304 and the adjusting sleeve 302 can be connected by threads. Since the stay cables 20 are inclined and the inclination angles and installation positions of each stay cable 20 are different, the length of the connecting device 30 can be easily adjusted by the adjusting sleeve 302, thereby realizing the connection of stay cables 20 with different spacings and improving the installation adaptability of the vibration damping system 1. At the same time, the connecting rods 304 are rotatably connected to the vibration damping device 10, allowing the stay cables 20 to rotate around the connection point, thereby avoiding the transmission of additional bending moment caused by fixed connection.

[0055] Meanwhile, since the individual damping device 10 can slide relative to the cable 20 due to the cable sleeve 400, under the action of the connecting device 30, when the cable 20 vibrates, the damping system 1 is allowed to slide slightly along the axial direction of the cable 20, which can reduce the possibility of axial force being converted into lateral vibration excitation.

[0056] In this embodiment, the connecting rod 304 can be an elastic rod, and the direction of the elastic force of the connecting rod 304 is from one connecting rod 304 to another. For example, the connecting rod 304 can be a connecting rod including a spring, or an elastic rod made of an elastic material. If the connecting rod 304 is a rigid rod, a small vibration of a certain stay cable 20 will be transmitted to the connected stay cables 20 through the connecting rod 304, and due to the frequency superposition, a larger amplitude vibration will be formed, which will aggravate the structural response. Setting the connecting rod 304 as an elastic rod can reduce the vibration transmission between the connected stay cables 20 and reduce the vibration coupling between the stay cables 20. The elastic rod provides basic cooperative constraint to avoid excessive independent vibration of the stay cables 20, while the vibration damping device 10 dissipates the vibration energy during the transmission process and weakens the coupling amplification caused by rigid transmission.

[0057] See Figure 7 and Figure 8 In one embodiment, each vibration damping system 1 includes 2 to 5 vibration damping devices 10, each vibration damping device 10 being installed on a different stay cable 20, and adjacent vibration damping devices 10 being connected by a connecting device 30. This avoids the formation of an overall vibration system by connecting too many stay cables 20, which could cause the vibration of a certain stay cable 20 to spread to all the stay cables 20 of the bridge through the connection point, resulting in group cable coupling vibration.

[0058] In another embodiment, each vibration damping system 1 includes 2 to 5 vibration damping devices 10. Different vibration damping systems 1 are sequentially installed on the stay cables 20, and adjacent vibration damping devices 10 in two adjacent vibration damping systems 1 are arranged on the same stay cable 20, and are spaced apart on the stay cable 20. Since the stay cables 20 are slender and flexible structures, different stay cables 20 have different lengths, and their vibration characteristics will be distributed differently along the cable length. By spaced apart the different vibration damping devices 10 arranged on the same stay cable 20, the vibration coupling between the vibration damping devices 10 can be weakened through the flexibility of the cable itself.

[0059] In other embodiments, the vibration damping system 1 can be installed at different locations on the same group of stay cables 20. Alternatively, different vibration damping devices 10 can be installed at different locations on the same stay cable 20.

[0060] In this embodiment, the vibration damping system 1 can be positioned near the bridge deck of the stay cable 20, for example, at or below one-quarter of the distance from the bridge deck. In another embodiment, the vibration damping system 1 can also be positioned near the bridge tower of the stay cable 20, for example, at or below one-quarter of the distance from the bridge tower.

[0061] See also Figure 8In one embodiment, this application also describes a cable-stayed bridge, including stay cables 20 and the vibration damping system 1 described in any of the above embodiments. Through the vibration damping system 1, when the stay cables 20 experience small-amplitude vibrations, only the spring damper 200 needs to provide basic elastic damping. During large-amplitude vibrations, the hydraulic damper 310 is triggered, increasing the damping effect of the spring damper 200, achieving a superimposed enhancement of damping force. Simultaneously, the increase in damping force is fast in response and slow in reset, improving the stability of damping adjustment. Furthermore, multiple stay cables 20 are interconnected via connecting devices 30 to improve the vibration resistance of a single stay cable 20.

[0062] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 this application.

[0063] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vibration damping device for stay cables, characterized in that, The vibration damping device includes: The installation lock fastener has an installation space formed within it for the cable to pass through; A spring damper is disposed within the installation space and is used to abut against the stay cable; The system includes an amplitude adjustment component, comprising a hydraulic damper and an amplitude adjustment damper. The hydraulic damper includes a first hydraulic cylinder, a first piston, and a compression push rod. The first hydraulic cylinder is mounted on the inner wall of the mounting locking element, and the first piston is disposed within the first hydraulic cylinder. One end of the compression push rod is connected to the first piston, and the other end extends out of the first hydraulic cylinder and is spaced apart from the cable. The distance between the hydraulic damper and the cable is less than the maximum compression of the spring damper. The amplitude adjustment damper includes a second hydraulic cylinder, a second piston, and an adjustment push rod. The second hydraulic cylinder is mounted on the inner wall of the mounting locking element, and the second piston is disposed within the second hydraulic cylinder. One end of the adjustment push rod is connected to the second piston, and the other end extends out of the second hydraulic cylinder and is connected to the spring damper. The end of the spring damper facing away from the cable is mounted on the inner wall of the mounting locking element via the amplitude adjustment damper. The rodless space within the first hydraulic cylinder and the rodless space within the second hydraulic cylinder are connected by a fluid inlet. The inlet and outlet channels are connected. A first check valve is installed in the inlet channel to allow liquid to flow from the first hydraulic cylinder to the second hydraulic cylinder. A second check valve is installed in the outlet channel to allow liquid to flow from the second hydraulic cylinder to the first hydraulic cylinder. The cross-sectional dimension of the inlet channel is larger than that of the outlet channel. The cross-sectional dimension of the first hydraulic cylinder is smaller than that of the second hydraulic cylinder. A first damping flow valve and a second damping flow valve are spaced apart on the second piston. The first damping flow valve allows liquid in the rod-side space of the second hydraulic cylinder to flow unidirectionally to the rodless space. The second damping flow valve allows liquid in the rodless space of the second hydraulic cylinder to flow unidirectionally to the rod-side space. The cross-sectional dimension of the flow channel of the first damping flow valve is larger than that of the flow channel of the second damping flow valve. When the hydraulic damper is subjected to pressure away from the cable, it triggers the amplitude adjustment damper to compress the spring damper in the direction of the spring damper.

2. The vibration damping device for stay cables according to claim 1, characterized in that, The cross-sectional dimensions of the liquid outlet channel are 1mm-5mm, and the cross-sectional dimensions of the liquid inlet channel are 5mm-20mm.

3. The vibration damping device for stay cables according to claim 1 or 2, characterized in that, The spring damper includes a damping spring and an amplitude adjustment plate. One end of the damping spring is connected to the amplitude adjustment plate, and the other end abuts against the cable. The end of the adjusting push rod away from the second piston is installed on the side of the amplitude adjustment plate facing away from the damping spring. The amplitude adjustment plate is also provided with a sliding hole communicating with the inner space of the damping spring. The hydraulic damper passes through the sliding hole so that the other end of the compression push rod is located inside the damping spring, and the adjusting push rod can push the amplitude adjustment plate to slide relative to the hydraulic damper.

4. The vibration damping device for stay cables according to claim 3, characterized in that, The hydraulic damper also includes a guide rod. The end of the compression push rod facing away from the first piston has a guide hole. One end of the guide rod is slidably inserted into the guide hole, and the other end is located in the damping spring and can abut against the cable.

5. The vibration damping device for stay cables according to claim 3, characterized in that, The number of spring dampers is multiple, and the multiple spring dampers are spaced apart around the axis of the stay cable. Each spring damper is provided with at least two amplitude adjustment components, and each amplitude adjustment component is spaced apart along the axis of the stay cable. Each spring damper includes at least two damping springs, and each damping spring of a spring damper is spaced apart along the axis of the stay cable.

6. A vibration damping system for stay cables, characterized in that, The vibration damping system includes at least two vibration damping devices as described in any one of claims 1-5; The connecting device is provided with its opposite ends mounted on the mounting locks of the two vibration damping devices, which are mounted on different stay cables. The connecting device is also capable of adjusting the distance between the two vibration damping devices.

7. The vibration damping system for stay cables according to claim 6, characterized in that, The connecting device includes an adjusting sleeve and two connecting rods. One end of each connecting rod is rotatably connected to the outer wall of the mounting lock of the two vibration damping devices. The other end of each connecting rod can be telescopically inserted into the adjusting sleeve. The connecting rod is an elastic rod, and the direction of the elastic force of the connecting rod is from one connecting rod to the other.

8. The vibration damping system for stay cables according to claim 6 or 7, characterized in that, The vibration damping device also includes a cable sleeve, which is slidably fitted onto the stay cable, and the end of the spring damper away from the amplitude adjusting damper is installed on the cable sleeve.

9. A cable-stayed bridge, characterized in that, The cable-stayed bridge includes stay cables and a vibration reduction system as described in any one of claims 6-8, wherein the vibration reduction system is installed on the stay cables.

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