Active vibration suppression device and method for bridge vibration

Abstract

The invention provides an active vibration suppression device and method for bridge vibration, belongs to the technical field of active control of bridge structures, and aims to solve the problem that a passive damper is generally adopted to improve the wind resistance of a bridge and cannot adapt to changing environmental conditions at present. 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 an active vibration suppression device and method for bridge vibration. 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 bridge wind resistance, devices that absorb energy without 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 an active vibration suppression device and method for bridge vibration to solve the problem that passive dampers are usually used to improve the wind resistance of bridges. These devices can absorb energy without external energy input. However, passive damping systems usually have fixed performance characteristics and cannot adapt to changing environmental conditions.

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

[0007] An active vibration suppression device for bridge vibration, 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 includes a lead screw and a top seat and a base installed on the bridge at intervals, the two ends of the lead screw are respectively connected to the top seat and the base, and the mass block is screwed on the lead screw; the drive module is installed on the base to drive the lead screw to rotate. The number of the lead screws is four, and the four lead screws are grouped in pairs and symmetrically arranged on both sides of the mass block. The mass block is threadedly connected to the lead screw through a support plate, and the support plate is screwed to the lead screw through a lead screw nut.

[0013] In this technical solution, it should be noted that in this solution, the lead screw adopts a ball screw, and the lead screw is driven to rotate by a driving device, so that the mass block connected to the lead screw thread moves along the axial direction of the lead screw, so as to achieve the purpose of driving the mass block to move up and down; the four lead screws are arranged in a square shape and act as a support, making full use of the internal space of the bridge, solving the disadvantage that the traditional tuned mass damper is difficult to install in the actual engineering bridge when the beam height is small; in addition, the use of the lead screw as a transmission part has the following advantages: (1) High transmission efficiency: The transmission efficiency of the ball screw transmission system is as high as 90% to 98%, which is 2 to 4 times that of the traditional sliding screw system, so it can obtain a large thrust with a small torque, and can also be converted from linear motion to rotational motion (reversible motion). (2) Smooth motion: The trapezoidal lead screw transmission system is a point contact rolling motion, with small friction resistance, high sensitivity, no vibration at startup, and no creeping phenomenon at low speed, so it can precisely control micro-feed. (3) High precision: The temperature rise of the ball screw transmission system is small during movement, and the axial clearance can be pre-tightened to eliminate the axial clearance and the screw can be pre-stretched to compensate for thermal expansion, so it can obtain higher positioning accuracy and repeat positioning accuracy. (4) High durability: The rolling contact points of the steel balls are hardened (HRC58~63) and precision ground. The circulation system process is purely rolling, and the wear is relatively small, so it has a high service life and precision retention. (5) Good synchronization: Due to the smooth movement, sensitive response, no blockage, and no slip, using several sets of the same ball screw transmission system to simultaneously drive several identical components or devices can achieve a good synchronization effect. (6) High reliability: Compared with other transmission machinery and hydraulic transmission, the ball screw transmission system has a very low failure rate and is relatively simple to repair and maintain. It only needs general lubrication and dust prevention. In special occasions, it can work without lubrication. (7) No backlash and pre-tightening: It adopts the Gothicarch groove shape, the axial clearance can be adjusted to a very small size, and it can also be easily transmitted. If an appropriate preload is added to eliminate the axial clearance, the screw can have better rigidity, reduce the elastic deformation between the ball, nut and screw when bearing, and achieve higher precision.

[0014] Preferably, the driving module includes a motor and a reducer fixed on a base, the reducer is connected to the output shaft of the motor, the output shaft sleeve of the reducer is provided with a worm gear, and a worm matched with the worm gear is fixedly provided on the lead screw.

[0015] In this technical solution, it should be noted that the motor drives the reducer to rotate, the reducer drives the worm gear to rotate, thereby driving the ball screw to rotate, the ball screw drives the screw nut to move up and down, and when the screw nut moves up and down, the nut drives the support plate and the mass fast to move up and down accordingly. The motor, reducer, worm gear, ball screw, and screw nut allow the mass fast lifting mechanism to be accurately positioned.

[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 vertical vibration circular frequency 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 internal 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 accurately positioned through a servo motor, a reducer, a worm gear, a ball screw and a screw nut. The four screws are arranged in a square shape and act as supports at the same time, making full use of the internal space of the bridge. This solves the problem that the traditional tuned mass damper is difficult to install in actual engineering bridges when the beam height is small. Among them, 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 in the screw lifting mechanism can perform corresponding active control movement with the vortex-induced vibration response of the bridge.

[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 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 It is a schematic diagram of the oblique three-dimensional structure 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 It 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] Fig. 9 is a schematic diagram of the internal structure of the shell;

[0048] Among them: 1-motor; 2-reducer; 3-housing; 4-screw; 5-screw nut; 6-seat bearing; 7-support plate; 8-mass block; 9-base; 10-top seat; 20-worm wheel; 21-worm. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Example

[0056] like Figure 1-Figure 9 As shown, an embodiment of the present invention discloses an active vibration suppression device for bridge vibration, comprising:

[0057] A vibration monitoring module is installed on the bridge to monitor the vibration status of the bridge;

[0058] Mass block 8, each box girder of the bridge is respectively installed with a mass block 8 through an installation assembly;

[0059] 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 8 to move at a set speed based on the analysis results, and the moving direction of the mass block 8 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 8 relative to the vibration of the bridge; the driving module adjusts the position or speed of the mass block 8 according to the command of the decision module. The movement of the mass block 8 is designed to be opposite to the vibration of the bridge, that is, when the structure vibrates in one direction, the mass block 8 moves in the opposite direction. When the mass block 8 moves, according to Newton's third law (the action force and the reaction force are equal and opposite in direction), the mass block 8 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 8 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 be adjusted by changing the movement frequency of the mass block 8. This adjustment helps to avoid resonance, which is one of the main reasons for the sharp increase in the amplitude of structural vibration.

[0060] like Figure 2As shown, in this embodiment, the mounting assembly includes a lead screw 4 and a top seat 10 and a base 9 installed on the bridge at intervals. The two ends of the lead screw 4 are rotatably connected to the base 9 through a seat bearing 6 and a top seat 10, respectively. The mass block 8 is screwed on the lead screw 4; the drive module is installed on the base 9 to drive the lead screw 4 to rotate. There are four lead screws 4, and the four lead screws 4 are grouped in pairs and symmetrically arranged on both sides of the mass block 8. The mass block 8 is threadedly connected to the lead screw 4 through a support plate 7, and the support plate 7 is screwed to the lead screw 4 through a lead screw nut 5. It should be noted that in this solution, the lead screw 4 is a ball screw 4, which is driven by a driving device to rotate, so that the mass block 8 connected to the lead screw 4 moves along the axial direction of the lead screw, so as to achieve the purpose of driving the mass block 8 to move up and down; the four lead screws 4 are distributed in a square shape and play a supporting role, making full use of the internal space of the bridge, solving the problem that the traditional tuned mass damper is difficult to install in the actual engineering bridge when the beam height is small; in addition, the use of the lead screw 4 as a transmission member has the following advantages: (1) High transmission efficiency: The transmission efficiency of the ball screw transmission system is as high as 90% to 98%, which is 2 to 4 times that of the traditional sliding lead screw 4 system, so it can obtain a larger thrust with a smaller torque, and can also be converted from linear motion to rotational motion (reversible motion). (2) Smooth motion: The trapezoidal lead screw transmission system is a point contact rolling motion, with small friction resistance, high sensitivity, no vibration at startup, and no creeping phenomenon at low speed, so it can precisely control micro-feeding. (3) High precision: The temperature rise of the ball screw 44 transmission system is small during movement, and the axial clearance can be pre-tightened to eliminate the axial clearance and the screw 4 can be pre-stretched to compensate for thermal elongation, so high positioning accuracy and repeat positioning accuracy can be obtained. (4) High durability: The rolling contact points of the steel balls are hardened (HRC58~63) and precision ground. The circulation system process is purely rolling, and the wear is relatively small, so it has a high service life and precision retention. (5) Good synchronization: Due to the smooth movement, sensitive response, no blockage, and no slip, using several sets of the same ball screw transmission system to simultaneously drive several identical components or devices can achieve a good synchronization effect. (6) High reliability: Compared with other transmission machinery and hydraulic transmission, the ball screw transmission system has a very low failure rate and is relatively simple to repair and maintain. It only needs general lubrication and dust prevention. In special occasions, it can work without lubrication. (7) No backlash and pre-tightening: It adopts the Gothicarch groove shape, the axial clearance can be adjusted to a very small size, and it can also be easily transmitted. If an appropriate preload is added to eliminate the axial clearance, the screw 4 can have better rigidity, reduce the elastic deformation between the ball, nut and screw 4 when loaded, and achieve higher precision.

[0061] like Figure 2As shown, in this embodiment, the driving module includes a motor 1 and a reducer 2 fixed on a base 9, the reducer 2 is connected to the output shaft of the motor 1, the output shaft sleeve of the reducer 2 is provided with a worm wheel 20, the lead screw 4 is fixedly provided with a worm 21 that cooperates with the worm wheel 20, and the worm wheel 20 and the worm 21 are both arranged in a housing 3. It should be noted that the motor 1 drives the reducer 2 to rotate, the reducer 2 drives the worm wheel 20 and the worm 21 to rotate, thereby driving the ball screw 44 to rotate, the ball screw 4 drives the screw nut 5 to move up and down, and when the screw 4 nut 5 moves up and down, the nut drives the support plate 7 and the mass fast to move up and down accordingly. The motor 1, the reducer 2, the worm wheel 20 and the worm 21, the ball screw 44, and the screw 4 nut 5 allow the mass fast lifting mechanism to be accurately positioned.

[0062] Example 2

[0063] This embodiment provides a bridge vibration active suppression method, including:

[0064] Step 1: Select a mass block that meets the requirements and install it on the lead screw 4;

[0065] In step 1, select a mass block that meets the requirements by following the steps below:

[0066] 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;

[0067] 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 ;

[0068] Step A2: Determine the bridge aerodynamic damping derivative based on the bridge girder section and the aerodynamic stiffness derivative

[0069] 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;

[0070] In step A3, the maximum aerodynamic force is determined according to the following formula:

[0071]

[0072]

[0073] In the formula, h represents the vertical displacement of the bridge, ω hsrepresents 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;

[0074] In step A4, the minimum mass of the mass block is determined by the following formula:

[0075]

[0076] 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.

[0077] 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 internal height s of the bridge main beam.

[0078] 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;

[0079] 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.

[0080] 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.

[0081] Example 3

[0082] This embodiment verifies the control of bridge vortex-induced vibration by an active vibration suppression device for bridge vibration of this application through a specific case. Specifically, a large-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. The bridge vortex-induced vibration active vibration suppressor device with the screw 4 lifted and lowered by the present application is used to control the vortex-induced vibration of the bridge specification 7. Among them, in this embodiment, the segment model vortex-induced vibration test of the beam under 8 vertical vibration modes and 4 torsional vibration modes is carried out, and the 12 vibration modes are shown in Table 1.

[0083] Table 1

[0084]

[0085] 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 under all vibration modes ( Figure 5 shown) and significant torsional vibration ( Figure 6 The test results of the bridge vortex vibration active damper device with screw 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.

[0086] Test conclusion: According to the vortex-induced vibration test results of the box girder main beam segment model, the bridge vortex vibration active suppressor device with a screw lift installed on the beam can completely eliminate the vertical and torsional vortex-induced vibrations of the section.

[0087] 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.

[0088] 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.

[0089] 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. An active vibration suppression device for bridge vibration, characterized in that: include: A vibration monitoring module is installed on the bridge to monitor the vibration status of the bridge; A mass block (8), each box girder of the bridge is respectively installed with a mass block (8) through an installation component; 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 (8) to move at a set speed, and the moving direction of the mass block (8) is opposite to the vibration direction of the bridge.

2. The active vibration suppression device for bridge according to claim 1 is characterized in that: The mounting assembly comprises a lead screw (4) and a top seat (10) and a base (9) installed on the bridge with an interval between the top and the bottom, the two ends of the lead screw (4) are respectively connected to the top seat (10) and the base (9), and the mass block (8) is screwed onto the lead screw (4); The driving module is mounted on a base (9) and is used to drive the lead screw (4) to rotate.

3. The active vibration suppression device for bridge according to claim 2 is characterized in that: The drive module comprises a motor (1) and a reducer (2) fixed on a base (9); the reducer (2) is connected to the output shaft of the motor (1); the output shaft sleeve of the reducer (2) is provided with a worm gear (20); a worm (21) matched with the worm gear (20) is fixedly provided on the lead screw (4); and the worm gear (20) and the worm gear (21) are both arranged in a housing (3).

4. The active vibration suppression device for bridges according to claim 2 is characterized in that: The number of the lead screws (4) is four, and the four lead screws (4) are arranged in groups of two and are symmetrically arranged on both sides of the mass block (8).

5. The active vibration suppression device for bridge according to claim 2 is characterized in that: The mass block (8) is threadedly connected to the lead screw (4) via a support plate (7), and the support plate (7) is threadedly connected to the lead screw (4) via a lead screw (4) nut (5).

6. The active vibration suppression device for bridges according to claim 1 is 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 (8) that meets the requirements and install it on the lead screw (4); 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 drive motor (1) is started to make the mass block (8) move at a set speed, and the movement direction of the mass block (8) is opposite to the vibration direction of the bridge.

8. The 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 device to adjust the movement of the mass block (8) according to the actual state of the bridge, thereby realizing dynamic and real-time vibration control.

9. The active vibration suppression method for bridge vibration according to claim 7, characterized in that: In step 1, select a mass block 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 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. The 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 stiffness derivative, 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, and U represents the wind speed of the incoming flow; In step A4, the minimum mass of the mass block is determined by the following formula: 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.

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