CN113984194B - Cable-stay bridge cable vibration monitoring devices and system - Google Patents
Cable-stay bridge cable vibration monitoring devices and system Download PDFInfo
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- CN113984194B CN113984194B CN202111270397.2A CN202111270397A CN113984194B CN 113984194 B CN113984194 B CN 113984194B CN 202111270397 A CN202111270397 A CN 202111270397A CN 113984194 B CN113984194 B CN 113984194B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a vibration monitoring device and a system for a stay cable of a cable-stayed bridge, belonging to the technical field of bridge safety and solving the problems of lower flexibility and inconvenient observation in the traditional technology, comprising a bridge body, wherein the top of the bridge body is fixedly provided with a magneto-rheological vibration damping system, the top of the magneto-rheological vibration damping system is fixedly connected with the stay cable, the magneto-rheological vibration damping system comprises a base, the top of the base is fixedly provided with a connecting seat, the side part of the connecting seat is hinged with a sleeve, a piston rod is sleeved in the sleeve, a damping adjustable system and a vibration detection system are arranged in the sleeve, one end of the piston rod far away from the sleeve is connected with the stay cable, the adjustable damping system is connected with the vibration detection system and a control box, the control box is wirelessly connected with a control console, so that the damping of a vibration-proof device of the cable-stayed bridge is adjustable, and the technical effect of detecting the vibration amplitude in real time can be achieved.
Description
Technical Field
The invention belongs to the technical field of bridge safety, and particularly relates to a vibration monitoring device and system for a stay cable of a cable-stayed bridge.
Background
A cable-stayed bridge is also called a diagonal tension bridge, which is a bridge with a main beam directly pulled on a bridge tower by a plurality of guys, and is a structural system formed by combining a pressure-bearing tower, a pulled cable and a bent-bearing beam body, wherein the cable can be regarded as a multi-span elastic support continuous beam with buttresses replaced by the guys, so that the bending moment in the beam body can be reduced, the building height can be reduced, the structural weight can be lightened, and the materials can be saved.
The magnetorheological elastomer is prepared by doping micrometer ferromagnetic particles into a high molecular polymer and curing the mixture in a magnetic field environment, so that the particles in a matrix have a chain or columnar structure, and the elastic modulus of the material can be changed along with the intensity of an external magnetic field, so that the magnetorheological elastomer is expected to be widely applied to variable-stiffness devices and the like. Compared with the common magnetorheological fluid, the magnetorheological elastomer not only has the high technical characteristics of controllability, reversibility, quick response and the like, but also has the unique advantages of good stability and the like, can be applied to vibration and noise reduction of vehicles such as automobiles, trains, ships and the like, and has breakthrough development when being used for the magnetorheological elastomer on buildings nowadays.
In the conventional technology, the vibration prevention of the cable-stayed bridge cable is mainly carried out on the cable-stayed bridge cable through damping liquid, but the real-time detection of the vibration amplitude of the cable-stayed bridge cable cannot be carried out, wherein the damping size cannot be controlled, so that the flexibility is low and the observation is inconvenient in the use process.
Disclosure of Invention
The invention provides a device and a system for monitoring vibration of a stay cable of a cable-stayed bridge, aiming at the problems of lower flexibility and inconvenient observation in the use process in the prior art, and aiming at: the damping of the anti-vibration device of the cable-stayed bridge inhaul cable is adjustable, and the vibration amplitude can be detected in real time.
The technical scheme adopted by the invention is as follows:
the utility model provides a cable-stay bridge cable vibration monitoring devices and system, includes the pontic, the fixed magnetic current of being provided with in top of pontic becomes damping system, magnetic current becomes damping system's top fixedly connected with cable, magnetic current becomes damping system and includes the base, the fixed connecting seat that is provided with in top of base, the lateral part of connecting seat articulates there is the sleeve, telescopic inside cover is equipped with the piston rod, telescopic inside is provided with damping adjustable system and vibration detection system, the piston rod is kept away from telescopic one end with the cable is connected, adjustable damping system is connected with the control box with vibration detection system, control box wireless connection has the control cabinet.
By adopting the scheme, the damping size of the magneto-rheological vibration damping system can be adjusted through the control box, when the inhaul cable shakes due to wind power or earthquake, the magneto-rheological vibration damping system absorbs most kinetic energy and consumes the kinetic energy, so that the shaking of the inhaul cable is reduced, the vibration monitoring system can detect the shaking amplitude of the inhaul cable in real time and transmit the detection result to the control box, the control box converts data and sends the data to the console, and workers in front of the console can adjust the damping of the magneto-rheological vibration damping system through the data displayed on the console.
The piston rod is fixedly connected with a first connecting rod, and a piston head is fixedly arranged at one end, close to the sleeve, of the first connecting rod.
By adopting the scheme, the use of materials on the first connecting rod can be effectively reduced, the piston motion of the piston rod in the sleeve is ensured through the piston head, the kinetic energy in the piston motion is absorbed through the damping action of the magnetorheological elastomer, and the vibration-proof effect of the inhaul cable is realized.
Vibration detecting system includes pressure detector and laser range finder, pressure detector is fixed to be set up telescopic inside, the fixed setting of laser range finder is in the inside of piston head, the inside of piston head is provided with the laser passageway, the laser passageway sets up laser range finder's axle center department, telescopic inside is fixed to be provided with the range finding board, the range finding board sets up between first piston rod and the piston head, the middle part of range finding board is provided with the through-hole, first piston rod can pass the through-hole is done the piston motion, laser range finder's laser irradiation is in the surface of range finding board.
By adopting the scheme, when the piston head moves as a piston, the laser range finder can detect the stroke of the piston head in real time, the console can calculate the movement speed of the piston head according to the stroke and the elapsed time, and the magnitude and the amplitude of the force generated by cable shaking can be obtained by combining the pressure value detected by the pressure detector.
The damping adjustable system comprises a magnetorheological elastomer, the magnetorheological elastomer is arranged inside the sleeve and is in contact with the piston head, a coil is wound outside the sleeve, and the coil is connected with the control box.
By adopting the scheme, the damping of the magnetorheological elastomer can be adjusted under the change of a magnetic field due to the physical property of the magnetorheological elastomer, wherein the current of the coil can change the magnetic field in the coil, so that the damping of the magnetorheological elastomer is controlled, and the adjustment of a magnetorheological vibration damping system is realized.
The piston rod is kept away from telescopic one end fixedly connected with second connecting rod, the second connecting rod articulates there is the mount pad, the mount pad with cable fixed connection.
And a power system is fixedly arranged on the bridge body and is connected with the control box.
The magnetorheological damping systems are arranged in 2 numbers, and the installation positions of the magnetorheological damping systems are vertical to each other.
By adopting the scheme, the damping in two directions of the stay rope can be realized by arranging the two magneto-rheological damping systems, when the piston rod of the magneto-rheological damping system on one side is subjected to a force perpendicular to the sleeve and cannot be pressed in, the piston rod on the other side is pressed in the sleeve, and the damping is provided, so that the device can absorb the vibration in all directions.
The control console is connected with a cloud system, and the cloud system comprises a learning module and a data module.
By adopting the scheme, the console sends the data to the cloud system after collecting the vibration data, the cloud system stores the data to the data module, historical data of stay cable vibration is stored in the data module, deep learning is carried out according to the historical data, final parameters are given out through the analysis module according to learning results, the console adjusts the damping of the magnetorheological elastomer according to the data after receiving the parameter data, intelligent control over the magnetorheological elastomer can be achieved through the scheme, the stay cable dynamic parameters in the data module are updated in real time through a big data technology, the accuracy of the given parameters is improved through the learning module, and intelligent stay cable vibration reduction is achieved.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the damping of the magneto-rheological vibration damping system can be adjusted through the control box, when the inhaul cable shakes due to wind power or earthquakes, the magneto-rheological vibration damping system absorbs most of kinetic energy and consumes the kinetic energy, so that the inhaul cable shakes is reduced, the vibration monitoring system can detect the shaking amplitude of the inhaul cable in real time and transmit a detection result to the control box, the control box converts data and sends the data to the console, and workers in front of the console can adjust the damping of the magneto-rheological vibration damping system through the data displayed on the console.
2. The use of materials on the first connecting rod can be effectively reduced, the piston motion of the piston rod in the sleeve is ensured through the piston head, the kinetic energy in the piston motion is absorbed through the damping action of the magnetorheological elastomer, and the vibration-proof effect of the inhaul cable is realized.
3. When the piston head is in piston motion, the stroke of the piston head can be detected in real time by the laser range finder, the motion speed of the piston head can be calculated by the console according to the stroke and the elapsed time, and the magnitude of the force generated by cable sway and the sway amplitude can be obtained by combining the pressure value detected by the pressure detector.
4. The damping of the magnetorheological elastomer can be adjusted under the change of a magnetic field due to the physical property of the magnetorheological elastomer, wherein the current of the coil can change the magnetic field in the coil, so that the damping of the magnetorheological elastomer is controlled, and the adjustment of a magnetorheological vibration damping system is realized.
5. The damping in two directions of the stay rope can be realized by arranging the two magneto-rheological damping systems, when the piston rod of the magneto-rheological damping system on one side is subjected to a force perpendicular to the sleeve and cannot be pressed in, the piston rod on the other side is pressed in the sleeve, and the damping is provided.
6. The system comprises a console, a data module, a learning module, a parameter data module, a data module and a learning module, wherein the console sends data to a cloud system after collecting vibration data, the cloud system stores the data into the data module, historical data of stay cable vibration are stored in the data module, deep learning is carried out according to the historical data, final parameters are given according to a learning result, after the console receives the parameter data, damping of the magnetorheological elastomer is adjusted according to the data, through the scheme, intelligent control over the magnetorheological elastomer can be achieved, stay cable vibration parameters in the data module are updated in real time through a big data technology, accuracy of given parameters is improved through the learning module, and intelligent stay cable vibration reduction is achieved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a side view angle configuration of the present invention;
FIG. 2 is a schematic view of the magnetorheological damping system of the present invention;
FIG. 3 is a schematic diagram of a data transmission structure according to the present invention;
fig. 4 is a schematic view of a depression structure of the present invention.
Description of the drawings: 1-a base; 2-a connecting seat; 3-a sleeve; 4-a piston rod; 5-mounting a base; 6-a control box; 7-a magnetorheological elastomer; 8-laser rangefinder; 9-a cavity; 10-a second connecting rod; 11-a coil; 12-a first connecting rod; 13-a console; 14-a piston head; 15-a pressure detector; 16-a power system; 17-a bridge; 18-a pull cable; 19-a distance measuring plate; 20-a first magnetorheological damping system; 21-a second magnetorheological damping system.
Detailed Description
All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1 to 3.
The first embodiment is as follows: .
The utility model provides a cable-stay bridge cable vibration monitoring devices and system, includes the pontic 17, the fixed damping vibration attenuation system that is provided with in top of pontic 17, damping vibration attenuation system's top fixedly connected with cable 18, damping vibration attenuation system includes base 1, the fixed connecting seat 2 that is provided with in top of base 1, the lateral part of connecting seat 2 articulates there is sleeve 3, the inside movable sleeve of sleeve 3 is equipped with piston rod 4, telescopic inside is provided with adjustable damping system and vibration detection system, piston rod 4 is kept away from sleeve 3's one end with cable 18 is connected, adjustable damping system is connected with control box 6 with vibration detection system, 6 wireless connections of control box have control cabinet 13.
The piston rod 4 is fixedly connected with a first connecting rod 12, and one end of the first connecting rod 12 close to the sleeve 3 is fixedly provided with a piston head 14.
The vibration detection system comprises a pressure detector 15 and a laser range finder 8, wherein the pressure detector 15 is fixedly arranged inside the sleeve 3, a cavity 9 is arranged inside the piston head 14, and laser of the laser range finder 8 irradiates the inner wall of the sleeve 3 through the cavity 9.
The damping adjustable system comprises a magnetorheological elastomer 7, the magnetorheological elastomer 7 is arranged inside the sleeve 3 and is in contact with one end, far away from the inhaul cable 18, of the piston rod 4, a coil 11 used for controlling the magnetorheological elastomer 7 is wound outside the sleeve 3, and the coil 11 is connected with the control box 6.
One end of the piston rod 4 far away from the sleeve 3 is fixedly connected with a second connecting rod 10, the second connecting rod 10 is hinged with a mounting seat 5, and the mounting seat 5 is fixedly connected with the inhaul cable 18.
And a power system 16 is fixedly arranged on the bridge body 17, and the power system 16 is connected with the control box 6.
The magnetorheological damping systems are arranged in 2 numbers, and the installation positions of the magnetorheological damping systems are vertical to each other.
The console 13 is connected with a cloud system, and the cloud system comprises a learning module and a data module.
In the above embodiment, the magnetorheological damper can realize the damping effect on the inhaul cable 18 and the adjustment of the damping magnitude, a magnetorheological damping system is selected, the change of the inhaul cable damping force can be realized through the simple adjustment of current, when the inhaul cable 18 vibrates due to wind power or earthquake, the vibration of the inhaul cable 18 and the bridge body 17 is transmitted to the magnetorheological damping system, specifically, the vibration of the inhaul cable 18 is converted into the piston motion of the sleeve 3 and the piston rod 4, wherein the magnetorheological damping system in the sleeve 3 obstructs the piston motion through the damping effect and achieves the effect of absorbing the vibration, the magnetorheological elastic body 7 is arranged in the sleeve 3, the magnetorheological elastic body 7 has certain resistance and can transmit the resistance to the inhaul cable 18 through the piston head 14, so as to reduce the amplitude, wherein 2 magnetorheological damping systems are arranged, the installation positions are perpendicular to each other, vibration reduction in two directions of the inhaul cable 18 can be achieved, the specific arrangement positions are shown in fig. 4, the first magnetorheological vibration reduction system 20 and the second magnetorheological vibration reduction system 21 are perpendicular to each other, when a sleeve of the first magnetorheological vibration reduction system 20 is subjected to force perpendicular to the sleeve and cannot be pressed in, a piston rod of the second magnetorheological vibration reduction system 21 on the other side is pressed in the sleeve, vibration reduction is provided, and by means of the structure, the device can be guaranteed to absorb vibration in all directions.
When the magnetorheological damper is used, the control box 6 is controlled through the control console 13, an initial current is supplied to the coil 11 through the control box 6, after the coil 11 is electrified, a magnetic field is formed and influences the magnetorheological elastomer 7, the larger the current is, the smaller the resistance which can be provided by the magnetorheological elastomer 7 is, the pressure detector 15 and the laser range finder 8 act together, the laser range finder 8 detects the stroke of the piston head 14 through the cavity 9 in real time, the laser range finder 8 can detect the distance between the piston head 14 and the range finder plate 19 in real time, and the control console 13 is used for setting the stroke from the moment that the distance between the piston head 14 and the range finder plate 19 is changed from small to large to the next moment that the distance between the laser range finder 8 and the piston head is changed from small to small, and the specific example is as follows: when the device is static, the distance between the piston head 14 and the distance measuring plate 19 is 1m, when vibration occurs, the piston head 14 is pressed inwards and the distance between the piston head 14 and the distance measuring plate 19 is increased, at the moment, the distance recorded by the control platform 13 is 1m which is x1, when the piston head 14 is pressed in place and tends to be pulled outwards, the distance between the piston head 14 and the distance measuring plate 19 is 1.5m which is x2, the total stroke recorded by the control platform 13 is 0.5m which is x2-x1, and the stroke data is returned to the control platform through the control box 16, wherein the distance measuring plate 19 is used for providing distance measuring reference for the laser distance measuring instrument 8, and the distance measured by the laser distance measuring instrument 8 is the distance between the piston head 14 and the distance measuring plate 19. The pressure detector 15 detects the pressure inside the sleeve 3 in real time, the pressure value is reflected to the control console 13, the control console 13 can calculate the movement speed of the piston head according to the formation and the elapsed time of the control console 13, the magnitude and the shaking amplitude of the shaking force of the inhaul cable 18 can be obtained by combining the pressure value detected by the pressure detector, the vibration power can be obtained according to the product of the speed and the pressure, a worker judges whether to perform damping adjustment on the magnetorheological elastomer 7 or not according to the vibration power of the force, if the damping of the magnetorheological elastomer 7 needs to be increased, the current is reduced, and if the damping of the magnetorheological elastomer 7 needs to be reduced, the current is increased.
Example two:
the control console 13 is connected with a cloud system, and the cloud system comprises a learning module, a data module and an analysis module.
The control console 13 is connected with a cloud system, the cloud system comprises a data module, a learning module and an analysis module, the data module can store parameters acquired by the magnetorheological vibration damping system, and data output is performed when the analysis module performs parameter analysis and the learning module performs self-operation; the learning module carries out unit self-learning according to historical data in the data module, can automatically run in the data module, and continuously improves a learning algorithm so as to improve the accuracy of analysis and judgment; the analysis module is used for analyzing data by combining parameters sent by the control console 13 to the cloud system with training results of the learning module, wherein the control console 13 requires workers to fill bridge body data, the diameter of the stay cable 18 and the number of the magnetorheological vibration damping systems, the analysis system returns analysis results and control commands to the control console 13 according to the parameters, the control console 13 displays a report, the current transmitted to the magnetorheological vibration damping systems is adjusted according to the control commands, intelligent control over the vibration damper is achieved, in actual use, the cloud system can integrate parameters of vibration of the stay cable 18 of the bridge, the learning module is continuously trained in the parameters, accuracy and precision of analysis results of the analysis module are improved, and intelligent control over vibration of the cable-stayed bridge 18 is achieved.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (5)
1. A vibration monitoring device and a system for a stay cable of a cable-stayed bridge comprise a bridge body (17), wherein the top of the bridge body (17) is fixedly provided with a magneto-rheological vibration damping system, the top of the magneto-rheological vibration damping system is fixedly connected with a stay cable (18), it is characterized in that the magneto-rheological vibration damping system comprises a base (1), a connecting seat (2) is fixedly arranged at the top of the base (1), the side part of the connecting seat (2) is hinged with a sleeve (3), a piston rod (4) is sleeved in the sleeve (3), a damping adjustable system and a vibration detection system are arranged in the sleeve (3), one end of the piston rod (4) far away from the sleeve (3) is connected with the inhaul cable (18), the damping adjustable system and the vibration detection system are connected with a control box (6), and the control box (6) is wirelessly connected with a control console (13);
the piston rod (4) is fixedly connected with a first connecting rod (12), and a piston head (14) is fixedly arranged at one end, close to the sleeve (3), of the first connecting rod (12);
the vibration detection system comprises a pressure detector (15) and a laser range finder (8), wherein the pressure detector (15) is fixedly arranged inside the sleeve (3), the laser range finder (8) is fixedly arranged inside the piston head (14), a laser channel (9) is arranged inside the piston head (14), the laser channel (9) is arranged at the axis of the laser range finder (8), a range board (19) is fixedly arranged inside the sleeve (3), the range board (19) is arranged between the first connecting rod (12) and the piston head (14), a through hole is formed in the middle of the range board (19), the first connecting rod (12) can penetrate through the through hole and move as a piston, and laser of the laser range finder (8) irradiates the surface of the range board (19);
the control console (13) is connected with a cloud system, and the cloud system comprises a learning module, a data module and an analysis module;
the distance measured by the laser range finder (8) is the distance from the piston head (14) to the range finding plate (19), the pressure detector (15) detects the pressure inside the sleeve (3) in real time and reflects the pressure value to the control console (13), the control console (13) calculates the movement speed of the piston head (14) according to the stroke and the elapsed time of the piston head, the magnitude of the shaking force and the shaking amplitude of the stay cable (18) are obtained by combining the pressure value detected by the pressure detector, the vibration power is obtained according to the product of the speed and the pressure, and a worker judges whether to perform damping adjustment on the magnetorheological elastomer (7) according to the vibration power of the force.
2. The device and the system for monitoring the vibration of the cable-stayed bridge cable according to claim 1, wherein the damping adjustable system comprises a magnetorheological elastomer (7), the magnetorheological elastomer (7) is arranged inside the sleeve (3) and is in contact with the piston head (14), a coil (11) is wound outside the sleeve (3), and the coil (11) is connected with the control box (6).
3. The device and the system for monitoring the vibration of the cable-stayed bridge cable according to claim 1, wherein one end of the piston rod (4) far away from the sleeve (3) is fixedly connected with a second connecting rod (10), the second connecting rod (10) is connected with a snap ring (5), and the snap ring (5) is fixedly connected with the cable (18).
4. The device and the system for monitoring the vibration of the stay cable of the cable-stayed bridge according to claim 1, wherein a power system (16) is fixedly arranged on the bridge body (17), and the power system (16) is connected with the control box (6).
5. The device and the system for monitoring the vibration of the stay cable of the cable-stayed bridge as claimed in claim 1, wherein the number of the magnetorheological damping systems is 2, and the installation positions are vertical to each other.
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| CN202111270397.2A CN113984194B (en) | 2021-10-29 | 2021-10-29 | Cable-stay bridge cable vibration monitoring devices and system |
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| CN202111270397.2A CN113984194B (en) | 2021-10-29 | 2021-10-29 | Cable-stay bridge cable vibration monitoring devices and system |
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| CN207554682U (en) * | 2017-12-13 | 2018-06-29 | 华东交通大学 | Built-in range sensor carries out the integrated-type MR damper of displacement detecting |
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| WO2014022910A1 (en) * | 2012-08-07 | 2014-02-13 | Smart Rotor Systems Inc. | Smart active vibration supression systems |
| CN113187847A (en) * | 2021-04-27 | 2021-07-30 | 枣庄学院 | Marine magneto-rheological elastomer vibration-damping buoyant raft |
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