Bridge vibration active suppression device and suppression method

Abstract

The invention provides a bridge vibration active suppression device and suppression method, belongs to the technical field of bridge structure active control, and aims at solving the problems that an existing tuned mass damper generally adopts a spring suspension system or a spring supporting system, installation is difficult to achieve in engineering practice, and the later maintenance and replacement cost is high. Comprising a vibration monitoring module used for monitoring the vibration state of a bridge and a mass block installed on a box girder through an installation assembly. And the decision-making module obtains monitoring data of the vibration monitoring module, analyzes the data and controls the driving module to drive the mass block to move according to a set speed based on an analysis result, and the moving direction of the mass block is opposite to the vibration direction of the bridge. According to the invention, the mass block carries out corresponding active control motion along with the vortex-induced vibration response of the bridge, so that the effect of controlling the vortex-induced vibration of the bridge in multiple modes by using only one device is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of active control of bridge structures, and in particular relates to a bridge vibration active suppression device and a suppression method. Background Art

[0002] Bridges generally refer to structures erected over rivers, lakes, and seas to allow vehicles and pedestrians to pass smoothly. In order to adapt to the modern high-speed development of the transportation industry, bridges are also extended to buildings that are erected to cross mountain streams, poor geology, or meet other transportation needs to make travel more convenient. Bridges are generally composed of superstructures, substructures, supports, and ancillary structures. The superstructure, also known as the span structure, is the main structure for crossing obstacles; the substructure includes abutments, piers, and foundations; the supports are force transmission devices installed at the supporting locations of the span structure and piers or abutments; and the ancillary structures refer to the bridgehead slabs, conical slope protection, revetments, diversion projects, etc.

[0003] Bridge structures play a vital role in construction projects. They not only provide passages across natural obstacles such as rivers and canyons, but also support daily traffic flow. However, bridge structures face challenges from a variety of natural factors, especially wind loads, which may cause vibrations and even structural damage to the bridge. Therefore, improving the wind resistance of bridges is an important engineering goal.

[0004] In the past, engineers have typically used passive dampers to improve a structure's wind resistance, devices that absorb energy without requiring external energy input. However, passive damping systems typically have fixed performance characteristics and cannot adapt to changing environmental conditions. Summary of the invention

[0005] In view of this, the present invention provides a bridge vibration active suppression device and suppression method to solve the existing tuned mass damper generally adopts a spring suspension system or a spring support system, the static displacement of the spring under the damper's own weight is quite large, and when the beam height is small, it is difficult to install in actual engineering. At the same time, the spring itself also has the problem of relaxation or even failure due to its own corrosion, aging, fatigue, and the high cost of later maintenance and replacement.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A bridge vibration active suppression device, comprising:

[0008] A vibration monitoring module is installed on the bridge to monitor the vibration status of the bridge;

[0009] Mass blocks, each box girder of the bridge is respectively equipped with mass blocks through mounting components;

[0010] A driving module and a decision module, wherein the decision module obtains the monitoring data of the vibration monitoring module, analyzes the data, and controls the driving module based on the analysis result to drive the mass block to move at a set speed, and the moving direction of the mass block is opposite to the vibration direction of the bridge.

[0011] In this technical solution, it should be noted that the vibration monitoring module monitors the vibration state of the structure in real time through sensors (such as accelerometers or displacement sensors) installed on the structure. These sensors can accurately measure parameters such as the vibration amplitude, frequency and phase of the structure. The decision module uses a preset control algorithm (such as PID control, fuzzy logic or more complex adaptive control strategies) to determine the appropriate response strategy of the mass block relative to the vibration of the bridge; the drive module adjusts the position or speed of the mass block according to the command of the decision module. The movement of the mass block is designed to be opposite to the vibration of the bridge, that is, when the structure vibrates in one direction, the mass block moves in the opposite direction. When the mass block moves, according to Newton's third law (the action force and the reaction force are equal and opposite in direction), the mass block exerts an opposite force on its support (that is, the structure itself). By precisely controlling the magnitude and direction of this force, the vibration of the bridge can be effectively offset or reduced. Through the above process, the vibration of the structure is reduced through two main mechanisms. The first is to dynamically move the mass block in the opposite direction of the structural vibration, generating a force that is opposite in magnitude and direction to the vibration. This reverse inertial force can effectively offset the vibration kinetic energy of the bridge. Secondly, the natural frequency of the structure can be adjusted by changing the moving frequency of the mass block. This adjustment helps to avoid resonance, which is one of the main reasons for the sharp increase in the vibration amplitude of the structure. In summary, in the present invention, a driving module that can actively adjust the output torque according to the vibration displacement of the external bridge is selected, so that the mass block of the device performs corresponding active control movement with the vortex-induced vibration response of the bridge, so as to achieve the effect of controlling the vortex-induced vibration of the bridge in multiple modes with only one device.

[0012] Preferably, the mounting assembly comprises two frames installed on the bridge with an upper and lower interval, and the two frames are respectively connected to rollers via a first main shaft, and a flexible member is wound around each roller, and one end of the flexible member is connected to a mass block; the driving module is installed on the frame to drive the roller to rotate; the driving module comprises a motor fixed to the frame and a second main shaft rotatably connected to the frame, the output end of the motor is connected to the second main shaft via a first chain, and the second main shaft is connected to the first main shaft via a second chain.

[0013] In this technical solution, it should be noted that the widely used mechanical measure in today's bridges is the tuned mass damper. The tuned mass damper has the advantages of no need for external energy input, easy installation and maintenance, and reliable performance. However, it is only effective for vibration control of a single mode, and has little effect on vortex-induced vibration control of other modes. In addition, since it generally adopts a spring suspension system or a spring support system, the static displacement of its spring under the action of the damper's own weight is quite large. When the beam height is small, it has the disadvantage of being difficult to install in actual engineering. In this solution, a flexible component is used to connect the mass block. The flexible component is specifically a steel cable. The driving module drives the drum to rotate to achieve the purpose of contracting the flexible component or releasing the flexible component, thereby driving the mass block to move. The present invention uses a motor, chain drive, drum, and flexible component to accurately position the mass lifting mechanism. The double flexible components use a linear distribution to provide power while acting as a support, making full use of the internal space of the bridge, and solving the problem that the traditional tuned mass damper is difficult to install in actual engineering bridges when the beam height is small. A servo motor that can actively adjust the output torque according to the external bridge vibration displacement is selected, so that the mass block of the device can perform corresponding active control movement with the vortex-induced vibration response of the bridge, so that the vortex-induced vibration of the bridge can be controlled in multiple modes with only one device. At the same time, the use of flexible components as transmission components in the device greatly reduces the manufacturing cost and maintenance cost of the device itself.

[0014] Preferably, a first sprocket and a second sprocket are installed on the output end of the motor and the second main shaft, and two ends of the first chain are respectively sleeved on the first sprocket and the second sprocket.

[0015] Preferably, a fourth sprocket and a third sprocket are respectively mounted on the second main shaft and the first main shaft, and two ends of the second chain are respectively sleeved on the fourth sprocket and the third sprocket.

[0016] A bridge vibration active suppression method, comprising:

[0017] Step 1: Select a mass block that meets the requirements and install it on the lead screw;

[0018] In step 1, select a mass block that meets the requirements by following the steps below:

[0019] Step A1: Obtain different types of historical parameters under bridge vibration conditions through sensors on the bridge, sort the historical parameters of each type in ascending order, and select the historical parameter with the largest parameter in each type;

[0020] The historical parameters include: bridge vertical displacement h, bridge vertical natural circular frequency ω hs , the circular frequency of vertical vibration of the bridge ω h ;

[0021] Step A2: Determine the bridge aerodynamic damping derivative based on the bridge girder section and the aerodynamic stiffness derivative

[0022] Step A3: Based on the historical parameters of each type determined in Step A1 and the bridge aerodynamic damping derivatives in Step 2 and the aerodynamic stiffness derivative Determine the maximum aerodynamic force F under bridge vibration conditions;

[0023] In step A3, the maximum aerodynamic force is determined according to the following formula:

[0024]

[0025]

[0026] In the formula, h represents the vertical displacement of the bridge, ω hs represents the vertical natural circular frequency of the bridge, ω h Indicates the circular frequency of vertical vibration of the bridge; represents the aerodynamic damping derivative of the bridge, represents the aerodynamic damping derivative of the bridge k=ω h b / U represents the reduced frequency, ρ represents the air density; b=B / 2 represents the half width of the bridge section;

[0027] In step A4, the minimum mass of the mass block is determined by the following formula:

[0028]

[0029] f represents the minimum vibration frequency of the bridge, s represents the internal height of the bridge beam, and m represents the mass of the mass block.

[0030] Step A4: Determine the minimum mass of the mass block based on the maximum aerodynamic force F, the minimum vibration frequency f of the bridge, and the inner height s of the bridge main beam.

[0031] Step 2: The vibration monitoring module monitors the vibration state of the bridge in real time, including monitoring the vibration amplitude, frequency and phase of the bridge;

[0032] Step 3: The decision module receives the vibration state of the bridge and uses a preset control algorithm to determine an appropriate response strategy. Based on the response strategy, the motor is driven to start, so that the mass block moves at a set speed, and the movement direction of the mass block is opposite to the vibration direction of the bridge.

[0033] In step 3, the vibration monitoring module will continuously monitor the vibration response of the bridge, and the decision module will control the driving device to adjust the movement of the mass block according to the actual state of the bridge to achieve dynamic and real-time vibration control.

[0034] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0035] 1. In the present invention, a driving module is selected that can actively adjust the output torque according to the vibration displacement of the external bridge, so that the mass block of the device can perform corresponding active control movement with the vortex-induced vibration response of the bridge, so as to achieve the effect of controlling the vortex-induced vibration of the bridge in multiple modes with only one device.

[0036] 2. In the present invention, the mass quick lifting mechanism is precisely positioned through motors, chain drives, rollers, and flexible components. The dual flexible components use linear distribution to provide power while acting as a support, making full use of the internal space of the bridge, solving the problem that when the beam height is small, the traditional tuned mass damper is difficult to install in actual engineering bridges. A servo motor that can actively adjust the output torque according to the vibration displacement of the external bridge is selected, so that the mass block of the device can perform corresponding active control movement with the vortex-induced vibration response of the bridge, so that the vortex-induced vibration of the bridge in multiple modes can be controlled with only one device. At the same time, the use of flexible components as transmission components in the device greatly reduces the manufacturing cost and maintenance cost of the device itself;

[0037] 3. In the present invention, a method for actively suppressing bridge vibration is proposed. After the bridge vibrates, the method can make the mass block vibrate accordingly according to the vibration frequency of the bridge to suppress the vibration of the bridge. In addition, the minimum mass block that meets the vibration conditions can also be determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0039] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0040] Figure 2 is a schematic diagram of the three-dimensional structure of the driving module of the present invention;

[0041] Figure 3 is a schematic diagram of the three-dimensional structure of a long-span bridge in Example 3 of the present invention;

[0042] Figure 4 This is a schematic diagram of the three-dimensional structure of a split double box beam according to Embodiment 3 of the present invention;

[0043] Figure 5 It is a data schematic diagram of the beam body in Example 3 of the present invention when obvious vertical vortex-induced vibration occurs under various vibration modes;

[0044] Figure 6 It is a data schematic diagram of the beam body in Example 3 of the present invention when obvious torsional vibration occurs under various vibration modes;

[0045] Figure 7 It is a schematic diagram of the vertical vibration data of the bridge after the suppression device is installed on the beam body of the present invention;

[0046] Figure 8 This is a schematic diagram of the torsional vortex-induced vibration data of the bridge after the suppression device is installed on the beam body of the present invention.

[0047] Among them: 1-motor; 2-roller; 3-flexible component; 4-mass block; 5-frame; 6-first sprocket; 7-first chain; 8-second sprocket; 9-first main shaft; 11-third sprocket; 12-second main shaft; 13-fourth sprocket; 14-second chain. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0054] Example 1

[0055] like Figure 1-2 As shown, an embodiment of the present invention discloses a bridge vibration active suppression device, which includes:

[0056] A vibration monitoring module is installed on the bridge to monitor the vibration status of the bridge;

[0057] Mass block 4, each box girder of the bridge is respectively installed with a mass block 4 through an installation component;

[0058] A driving module and a decision module, wherein the decision module obtains the monitoring data of the vibration monitoring module, analyzes the data, and controls the driving module to drive the mass block 4 to move at a set speed based on the analysis results, and the moving direction of the mass block 4 is opposite to the vibration direction of the bridge. It should be noted that the vibration monitoring module monitors the vibration state of the structure in real time through sensors (such as accelerometers or displacement sensors) installed on the structure. These sensors can accurately measure parameters such as the vibration amplitude, frequency and phase of the structure. The decision module uses a preset control algorithm (such as PID control, fuzzy logic or more complex adaptive control strategies) to determine the appropriate response strategy of the mass block 4 relative to the vibration of the bridge; the driving module adjusts the position or speed of the mass block 4 according to the command of the decision module. The movement of the mass block 4 is designed to be opposite to the vibration of the bridge, that is, when the structure vibrates in one direction, the mass block 4 moves in the opposite direction. When the mass block 4 moves, according to Newton's third law (the action force and the reaction force are equal and opposite in direction), the mass block 4 applies an opposite force to its bracket (that is, the structure itself). By accurately controlling the magnitude and direction of this force, the vibration of the bridge can be effectively offset or reduced. Through the above process, the structural vibration is reduced through two main mechanisms. First, by dynamically moving the mass block 4 in the opposite direction of the structural vibration, a force with a magnitude and direction opposite to the vibration is generated. This reverse inertial force can effectively offset the vibration kinetic energy of the bridge. Secondly, the natural frequency of the structure can also be adjusted by changing the moving frequency of the mass block 4. This adjustment helps to avoid resonance, which is one of the main reasons for the sharp increase in the amplitude of structural vibration. In summary, in the present invention, a driving module that can actively adjust the output torque according to the external bridge vibration displacement is selected, so that the mass block 4 of the device performs corresponding active control movement with the vortex-induced vibration response of the bridge, so as to achieve the effect of controlling the vortex-induced vibration of the bridge in multiple modes with only one device.

[0059] like Figure 1-Figure 2As shown, in this embodiment, the mounting assembly includes two frames 5 installed on the bridge with an upper and lower interval, and the two frames 5 are respectively connected to rollers 2 through a first main shaft 9 for rotation, and a flexible member 3 is wound around each roller 2, and one end of the flexible member 3 is connected to a mass block 4; the driving module is installed on the frame 5 to drive the roller 2 to rotate; the driving module includes a motor 1 fixed to the frame 5 and a second main shaft 12 rotatably connected to the frame 5, the output end of the motor 1 is connected to the second main shaft 12 through a first chain 7, and the second main shaft 12 is connected to the first main shaft 9 through a second chain 14. It should be noted that the widely used mechanical measure in today's bridges is the tuned mass damper. The tuned mass damper has the advantages of no need for external energy input, easy installation and maintenance, and reliable performance. However, it is only effective for vibration control of a single mode, and has little effect on vortex-induced vibration control of other modes. In addition, since it generally adopts a spring suspension system or a spring support system, the static displacement of its spring under the action of the damper's own weight is quite large. When the beam height is small, it has the disadvantage of being difficult to install in actual engineering. In this solution, a flexible component 3 is connected to a mass block 4. The flexible component 3 is specifically a steel cable. The driving module drives the drum 2 to rotate to achieve the purpose of contracting the flexible component 3 or releasing the flexible component 3, thereby driving the mass block 4 to move. The present invention uses a motor 1, a chain drive, a drum 2, and a flexible component 3 to accurately position the mass block 4 lifting mechanism. The double flexible components 3 use a linear distribution to provide power while acting as a support, making full use of the internal space of the bridge, and solving the problem that when the beam height is small, the traditional tuned mass damper is difficult to install in the actual engineering bridge. Among them, a servo motor 1 that can actively adjust the output torque according to the external bridge vibration displacement is selected, so that the mass block 4 of the device can perform corresponding active control movement with the vortex-induced vibration response of the bridge, so that only one device can be used to control the vortex-induced vibration of the bridge in multiple modes. At the same time, the use of a flexible component 3 as a transmission component in the device greatly reduces the manufacturing cost and maintenance cost of the device itself.

[0060] like Figure 2 As shown, in this embodiment, a first sprocket 6 and a second sprocket 8 are installed on the output end of the motor 1 and the second main shaft 12, and two ends of the first chain 7 are respectively sleeved on the first sprocket 6 and the second sprocket 8.

[0061] like Figure 2 As shown, in this embodiment, a fourth sprocket 13 and a third sprocket 11 are respectively mounted on the second main shaft 12 and the first main shaft 9, and two ends of the second chain 14 are respectively sleeved on the fourth sprocket 13 and the third sprocket 11.

[0062] Example 2

[0063] This embodiment verifies a bridge vibration active suppression device of the present application through a specific case. Specifically, a long-span bridge in this embodiment is as follows: Figure 3 As shown in the figure, it is a double-tower suspension bridge with a span combination of 660m+2300m+717m+503m. The main beam of the bridge is as follows Figure 4 The split double box girder shown.

[0064] The bridge vortex-induced vibration is controlled by using the bridge vortex-induced vibration active vibration suppressor device with dual-motor flexible component lifting according to the present application.

[0065] In this embodiment, a total of 8 vertical vibration modes and 4 torsional vibration modes are tested on the segment model of the beam, and the 12 vibration modes are shown in Table 1.

[0066] Table 1

[0067]

[0068] The results of the vortex-induced vibration test of the main beam segment model of the split box girder show that at a wind attack angle of 0° and a damping ratio of 0.16%, the beam body undergoes obvious vertical vortex-induced vibration in all vibration modes ( Figure 5 shown) and significant torsional vibration ( Figure 6 The test results of the bridge vortex vibration active damper device with dual motor flexible component lifting installed on the main beam are shown in Figure 7 and Figure 8 As shown, from Figure 7 and Figure 8 It can be seen that the vertical and torsional vortex-induced vibrations of the segment model are completely eliminated.

[0069] Test conclusion: According to the vortex-induced vibration test results of the box girder main beam segment model, the bridge vortex-induced vibration active suppressor device with dual-motor flexible component lifting and lowering installed on the beam can completely eliminate the vertical and torsional vortex-induced vibration of the section.

[0070] Example 3

[0071] This embodiment provides a bridge vibration active suppression method, including:

[0072] Step 1: Select a mass block 4 that meets the requirements and install it on the lead screw;

[0073] In step 1, select a mass block 4 that meets the requirements by following the steps below:

[0074] Step A1: Obtain different types of historical parameters under bridge vibration conditions through sensors on the bridge, sort the historical parameters of each type in ascending order, and select the historical parameter with the largest parameter in each type;

[0075] The historical parameters include: bridge vertical displacement h, bridge vertical natural circular frequency ω hs , the circular frequency of vertical vibration of the bridge ω h ;

[0076] Step A2: Determine the bridge aerodynamic damping derivative based on the bridge girder section and the aerodynamic stiffness derivative

[0077] Step A3: Based on the historical parameters of each type determined in Step A1 and the bridge aerodynamic damping derivatives in Step 2 and the aerodynamic stiffness derivative Determine the maximum aerodynamic force F under bridge vibration conditions;

[0078] In step A3, the maximum aerodynamic force is determined according to the following formula:

[0079]

[0080]

[0081] In the formula, h represents the vertical displacement of the bridge, ω hs represents the vertical natural circular frequency of the bridge, ω h Indicates the circular frequency of vertical vibration of the bridge; represents the aerodynamic damping derivative of the bridge, represents the aerodynamic damping derivative of the bridge k=ω h b / U represents the reduced frequency, ρ represents the air density; b=B / 2 represents the half width of the bridge section;

[0082] In step A4, the minimum mass of mass block 4 is determined by the following formula:

[0083]

[0084] f represents the minimum vibration frequency of the bridge, s represents the internal height of the bridge main beam, and m represents the mass of the mass block 4.

[0085] Step A4: Determine the minimum mass of the mass block 4 based on the maximum aerodynamic force F, the minimum vibration frequency f of the bridge, and the inner height s of the bridge main beam.

[0086] Step 2: The vibration monitoring module monitors the vibration status of the bridge in real time, including monitoring the vibration amplitude, frequency and phase of the bridge:

[0087] Step 3: The decision module receives the vibration state of the bridge and uses a preset control algorithm to determine an appropriate response strategy. Based on the response strategy, the motor is driven to start, so that the mass block 4 moves at a set speed, and the movement direction of the mass block 4 is opposite to the vibration direction of the bridge.

[0088] In step 3, the vibration monitoring module will continuously monitor the vibration response of the bridge, and the decision module will control the driving device to adjust the movement of the mass block 4 according to the actual state of the bridge to achieve dynamic and real-time vibration control.

[0089] The circuits, electronic components and modules involved are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to software and methods.

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bridge vibration active suppression device, characterized in that: include: A vibration monitoring module is installed on the bridge to monitor the vibration status of the bridge; A mass block (4), each box girder of the bridge is respectively equipped with a mass block (4) via an installation assembly; A driving module and a decision module, wherein the decision module obtains monitoring data from the vibration monitoring module, analyzes the data, and controls the driving module based on the analysis result to drive the mass block (4) to move at a set speed, and the moving direction of the mass block (4) is opposite to the vibration direction of the bridge.

2. The bridge vibration active suppression device according to claim 1 is characterized in that: The mounting assembly comprises two frames (5) installed on the bridge at an interval, the two frames (5) are respectively connected to rollers (2) via first main shafts (9) for rotation, each roller (2) is wound with a flexible member (3), and one end of the flexible member (3) is connected to a mass block (4); The driving module is mounted on a frame (5) and is used to drive the roller (2) to rotate.

3. The bridge vibration active suppression device according to claim 2 is characterized in that: The driving module comprises a motor (1) fixed on a frame (5) and a second main shaft (12) rotatably connected to the frame (5); an output end of the motor (1) is connected to the second main shaft (12) via a first chain (7); and the second main shaft (12) is connected to the first main shaft (9) via a second chain (14).

4. The bridge vibration active suppression device according to claim 3 is characterized in that: A first sprocket (6) and a second sprocket (8) are mounted on the output end of the motor (1) and the second main shaft (12); two ends of the first chain (7) are respectively sleeved on the first sprocket (6) and the second sprocket (8).

5. The bridge vibration active suppression device according to claim 3 is characterized in that: A fourth sprocket (13) and a third sprocket (11) are respectively mounted on the second main shaft (12) and the first main shaft (9), and two ends of the second chain (14) are respectively sleeved on the fourth sprocket (13) and the third sprocket (11).

6. The bridge vibration active suppression device according to claim 1, characterized in that: The vibration monitoring module can measure the vibration amplitude, frequency and phase of the structure.

7. A bridge vibration active suppression method, characterized in that: The device according to any one of claims 1 to 6 comprises: Step 1: Select a mass block (4) that meets the requirements and install it on the flexible component (3); Step 2: The vibration monitoring module monitors the vibration state of the bridge in real time, including monitoring the vibration amplitude, frequency and phase of the bridge; Step 3: The decision module receives the vibration state of the bridge and uses a preset control algorithm to determine an appropriate response strategy. Based on the response strategy, the two motors (1) are driven to start, so that the mass block (4) moves at a set speed, and the movement direction of the mass block (4) is opposite to the vibration direction of the bridge.

8. A bridge vibration active suppression method according to claim 7, characterized in that: In step 3, the vibration monitoring module continuously monitors the vibration response of the bridge, and the decision module controls the driving module to adjust the movement of the mass block (4) according to the actual state of the bridge, thereby realizing dynamic and real-time vibration control.

9. The bridge vibration active suppression method according to claim 7, characterized in that: In step 1, select a mass block (4) that meets the requirements by following the steps below: Step A1: Obtain different types of historical parameters under bridge vibration conditions through sensors on the bridge, sort the historical parameters of each type in ascending order, and select the historical parameter with the largest parameter in each type; The historical parameters include: bridge vertical displacement h, bridge vertical natural circular frequency ω hs , the vertical vibration circular frequency of the bridge ω h ; Step A2: Determine the bridge aerodynamic damping derivative based on the bridge girder section and the aerodynamic stiffness derivative Step A3: Based on the historical parameters of each type determined in Step A1 and the bridge aerodynamic damping derivatives in Step 2 and the aerodynamic stiffness derivative Determine the maximum aerodynamic force F under bridge vibration conditions; Step A4: Determine the minimum mass of the mass block (4) based on the maximum aerodynamic force F, the minimum vibration frequency f of the bridge and the internal height s of the bridge main beam.

10. A bridge vibration active suppression method according to claim 9, characterized in that: In step A3, the maximum aerodynamic force is determined according to the following formula: In the formula, h represents the vertical displacement of the bridge, ω hs represents the vertical natural circular frequency of the bridge, ω h Indicates the circular frequency of vertical vibration of the bridge; represents the aerodynamic damping derivative of the bridge, represents the aerodynamic damping derivative of the bridge k=ω h b / U represents the reduced frequency, ρ represents the air density; b=B / 2 represents the half width of the bridge section; U represents the wind speed of the incoming flow; In step A4, the minimum mass of the mass block (4) is determined by the following formula: f represents the minimum vibration frequency of the bridge, s represents the internal height of the bridge main beam, and m represents the mass of the mass block (4).

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