CN110455910A - Cable-stayed bridge cable corrosion monitoring system and monitoring method based on magnetic field gradient tensor - Google Patents
Cable-stayed bridge cable corrosion monitoring system and monitoring method based on magnetic field gradient tensor Download PDFInfo
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Abstract
The invention discloses a kind of cable-stayed bridge cable Damage of Corroded monitoring system and monitoring method based on magnetic field gradient tensor, the monitoring system includes Damage of Corroded measuring probe, data transmission system and data control system, Damage of Corroded measuring probe is used to measure the magnetic induction intensity of drag-line, and the induction information measured is transmitted to data transmission system by wireless data transfer module, data transmission system is transmitted to data control system again, data control system is according to magnetic induction intensity information calculating magnetic field gradient, and the corrosion ratio of drag-line is further calculated, and then safe early warning is carried out to the Damage of Corroded of drag-line.
Description
Technical field
The present invention relates to field of measuring technique, and in particular to a kind of cable-stayed bridge cable corrosion damage based on magnetic field gradient tensor
Hurt monitoring system and monitoring method.
Background technique
Drag-line is the important component in stayed-cable bridge structure system, is crucial, important primary structure member in cable-stayed bridge, rises
It is most sensitive in the important function pulled one hair and move the whole body and stayed-cable bridge structure system, be easiest to that damage or broken occurs
Bad component.In the serious area of atmosphere pollution, the serious area of water pollution, rainwater (especially acid rain), maritime environment, oblique pull
Bridge drag-line easily can generate weight to Cable-Stayed Bridge Structure by the erosion of corrosiveness of the environment medium, the Damage of Corroded of drag-line or destruction
It is big to influence even to cause serious catastrophic effect, it is to extend where the bottleneck of Cable-Stayed Bridge Structure service life, the performance of drag-line is tight
Ghost image rings the service life of Cable-Stayed Bridge Structure.Therefore, to ensure that the structure of cable-stayed bridge is safe and prevents the generation of operation accident, have
Necessity carries out Damage of Corroded monitoring to cable-stayed bridge cable, to ensure the life-cycle safety of cable-stayed bridge.
Artificial observation is common method when early stage people monitor cable-stayed bridge cable Damage of Corroded, but high altitude operation is serious
The life security of technical staff is threatened, and there are a large amount of subjective experience ingredients.Current acoustic emission, due to noise signal
Interference, acoustic emission is difficult accurately to obtain useful signal, this will have an impact Damage of Corroded monitoring effect.Based on magnetic field
Detection/monitoring technology, do not need to clear up tested component surface iron rust greasy dirt, surface paint and coating before monitoring without going
It removes, can be detected with holding member original appearance.Special magnetizing equipment is not needed when monitoring, merely with earth magnetic field as excitation
Magnetizing field has great convenience.Existing Magnetic Memory method only can qualitatively measurement structure Damage of Corroded, but without standard measure
Ground monitors Damage of Corroded, and there are no standard measures to provide Damage of Corroded degree, safety coefficient and damage position can not be also provided, so nothing
The carry out safe early warning of standard measure.Magnetic leakage detection method is theoretically not perfect at present and has difficulties in Quantitative Monitoring.
Summary of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of based on the bridge scouring monitoring for becoming baseline and magnetic field gradient
System and monitoring method, with solve existing Magnetic Memory method only can qualitatively measurement structure Damage of Corroded, but can not quantitatively supervise
The problem of surveying Damage of Corroded.
A kind of cable-stayed bridge cable Damage of Corroded monitoring system based on magnetic field gradient tensor, including Damage of Corroded measurement are visited
Head, data transmission system and data control system；
The Damage of Corroded measuring probe can move along drag-line and measure the magnetic induction intensity of drag-line, and by magnetic induction
Strength information is transmitted to the data transmission system；
The magnetic induction intensity information is transmitted to the data control system again by the data transmission system；
Drawing is further calculated according to the magnetic induction intensity information calculating magnetic field gradient in the control control system
The Damage of Corroded rate of rope, and then safe early warning is carried out to the Damage of Corroded of drag-line.
The Damage of Corroded measuring probe includes: in one of the embodiments,
Shell；
Magnetic sensor is set in the shell, for measuring the magnetic induction intensity of drag-line；
Wireless data transfer module is set in the shell, and the magnetic induction intensity information for will measure is transferred to described
Data transmission system；
Microprocessor is set in the shell, for controlling the magnetic sensor and the wireless data transmission mould
Block；And
Power supply is set in the shell, for being the magnetic sensor, the wireless transport module and micro- place
It manages device and electric energy is provided.
The shell is cuboid in one of the embodiments, and the magnetic sensor is set to the several of the shell
At what center, the x, y and z axes of the magnetic sensor are parallel with the height of the shell, width and length direction.
A kind of cable-stayed bridge cable Damage of Corroded monitoring method based on magnetic field gradient tensor, includes the following steps:
(1) drag-line is divided into several sections to be monitored, since certain section one end of drag-line, Damage of Corroded measuring probe
It is at the uniform velocity moved along the other end of drag-line towards section, the xoz plane of Damage of Corroded measuring probe is parallel with vertical guide, Damage of Corroded
Always and relative distance parallel with the length direction of drag-line remains unchanged in the direction z of measuring probe, moves along a drag-line
In the process, the direction x and y of Damage of Corroded measuring probe remains unchanged, the rate travel v of the measuring probe of Damage of Corroded are as follows:
V=dresf (1)
In formula, dresFor the resolution ratio of preassigned Damage of Corroded monitoring, f is the sample frequency of magnetic sensor；
(2) in the drag-line section of selection, position of the Damage of Corroded measuring probe on drag-line is zi=dresI, wherein
I=0 ... n, n indicate the section monitored need to number to be tested, obtain the magnetic induction density B in the direction x, y and zx(zi), By
(zi) and Bz(zi)；
(3) total magnetic induction density B is calculatedt(zi):
(4) position z in the drag-line section selectediThe gradient of the magnetic induction intensity at place in the z-direction:
In formula, Bx(zi) and Bx(zi-1) it is respectively position ziAnd zi-1The magnetic induction intensity in the direction x at place；By(zi) and By
(zi-1) it is respectively position ziAnd zi-1Locate the magnetic induction intensity in the direction y；Bz(zi) and Bz(zi-1) it is respectively position ziAnd zi-1The z at place
The magnetic induction intensity in direction, Bxz(zi), Byz(zi) and Bzz(zi) it is respectively Bx(zi), By(zi), Bz(zi) gradient in the z-direction；
(5) position z in the drag-line section selectediThe gradient of total magnetic induction intensity at place in the z-direction:
(6) after the completion of testing, the magnetic field gradient of the drag-line of test section is averaged:
In formula, E (| Bxz,j|)、E(|Byz,j|)、E(|Bzz,j|) and E (| Btz,j|) it is respectively Bxz(zi), Byz(zi)、Bzz
(zi) and Btz(zi) average value of absolute value in test section；
(7) the Damage of Corroded rate of drag-line is calculated by four magnetic field gradients respectively:
In formula, ηxz,j、ηyz,j、ηzz,jAnd ηtz,jRespectively pass through Bxz(zi), Byz(zi)、Bzz(zi) and Btz(zi) four class magnetic
The corrosion ratio that field gradient is calculated, kjIt is repaired to be relevant at a distance from drag-line steel wire center to magnetic sensor center probe
Positive coefficient；kjCalculation formula is as follows:
In formula, sj-1And sjJth -1 time monitoring and drag-line center to magnetic sensor in jth time monitoring process are visited respectively
The distance at head center；
(8) the Damage of Corroded rate of drag-line is calculated
(9) pass through the drag-line Damage of Corroded rate of selection sectionWith the limit corrosion ratio η of permissionlimComparison carries out safety
Evaluation and early warning；
(10) it is monitored calculating according to all sections of the abovementioned steps to cable-stayed bridge cable, respectively obtains all areas of drag-line
The corrosion ratio of section carries out safety evaluation and early warning respectively；
(11) it is calculated by periodic monitoring, a series of corrosion ratio that is changed over time, calculates and change over time
Corrosion ratio gradient carries out the evaluation and early warning of drag-line Damage of Corroded rate by the evolution of corrosion ratio.
Beneficial effects of the present invention:
The present invention is based on magnetic field gradient tensors to propose cable-stayed bridge cable Damage of Corroded monitoring system and monitoring method, passes through rust
Deteriorate and hurt measuring probe and moved along drag-line, measures the magnetic induction intensity of drag-line, calculating magnetic field gradient further obtains drag-line
Damage of Corroded rate can quantitatively realize that drag-line Damage of Corroded monitors, and solve in the magnetic field monitoring of cable-stayed bridge cable Damage of Corroded
Can not Quantitative Monitoring the problem of, do not need to clear up tested component surface iron rust greasy dirt before monitoring, surface paint and coating also without
It needs to remove, can be detected with holding member original appearance, do not need to apply magnetizing equipment, be changed by magnetic induction intensity by data control
System-computed processed goes out drag-line corrosion ratio, carries out early warning to drag-line Damage of Corroded.The present invention provides a kind of new cable-stayed bridge cables
The method of Damage of Corroded monitoring, number of devices needed for monitoring system is few, lays easy, and monitoring is accurate.
Detailed description of the invention
Fig. 1 is the schematic illustration that cable-stayed bridge cable Damage of Corroded monitors system in an embodiment；
The implementation diagram of the monitoring system of cable-stayed bridge cable Damage of Corroded shown in Fig. 2 Fig. 1；
Fig. 3 is the structural schematic diagram of Damage of Corroded measuring probe in Fig. 1.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, because the invention is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
Referring to Fig. 1, the cable-stayed bridge cable Damage of Corroded based on magnetic field gradient tensor in an embodiment monitors system,
Including Damage of Corroded measuring probe 7, data transmission system 8 and data control system 9.
Referring to Figure 2 together, Damage of Corroded measuring probe 7 can be moved along drag-line 6, and Damage of Corroded measuring probe 7 moves
The magnetic induction intensity of drag-line 6 can be measured in dynamic process, and the magnetic induction intensity information measured is transmitted to data transmission system
System 8, magnetic induction intensity information is transferred to data control system 9 again by data transmission system 8.Data control system 9 is according to magnetic strength
Strength information calculating magnetic field gradient is answered, further obtains the Damage of Corroded rate of drag-line 6, and then carry out to the Damage of Corroded of drag-line 6
Safe early warning.
Also referring to Fig. 3, specifically, Damage of Corroded measuring probe 7 includes shell, magnetic sensor 1, wireless data
Transmission module 2, microprocessor 3 and power supply 4.Shell is as carrier, magnetic sensor 1, wireless data transfer module 2, Wei Chu
Reason device 3 and power supply 4 are all set in shell.Shell preferred high strength engineering plastic materials are made, and magnetic field can penetrate shell.Three
Axial magnetic sensor 1 is used to measure the magnetic induction intensity of drag-line 6.Wireless data transfer module 2 is used for the magnetic induction intensity that will be measured
Information is transferred to data transmission system 8, meanwhile, the control signal that data control system 9 issues can be via data transmission system 8
It is transferred to wireless data transfer module 2, realizes control Damage of Corroded measuring probe 7.Microprocessor 3 is for controlling three axis magnetic sensing
Device 1 and wireless data transfer module 2.Power supply 4 is used to provide electricity for magnetic sensor 1, wireless transport module and microprocessor 3
Energy.
Further, shell is cuboid, and magnetic sensor 1 is set at the geometric center of shell, magnetic sensor 1
X, y and z axes it is parallel with the height of shell, width and length direction.The geometric center of shell is set as origin o.Data control system
System 9 uses terminal and network.
It please refers to Fig.1 to Fig.3, the present invention also provides a kind of, and the cable-stayed bridge cable Damage of Corroded based on magnetic field gradient tensor is supervised
Survey method.To realize the monitoring method, above-mentioned monitoring system is used.The monitoring method specifically includes the following steps:
This monitoring method is periodically monitored 5 drag-line 6 of cable-stayed bridge, every time by the overall length range of 5 drag-line 6 of cable-stayed bridge
Monitoring is primary, below by taking jth time monitoring as an example.
(1) drag-line 6 is divided into several sections, each section is 1 meter, is monitored.Monitor 5 drag-line 6 of cable-stayed bridge corrosion damage
When hurting, since certain section one end of drag-line 6, Damage of Corroded measuring probe 7 is along 5 drag-line 6 of cable-stayed bridge towards the other end of section
It at the uniform velocity moves, the xoz plane of Damage of Corroded measuring probe 7 is parallel with vertical guide, and the direction z of Damage of Corroded measuring probe 7 is always
Parallel and relative distance remains unchanged with the length direction of drag-line 6, and in along 6 moving process of drag-line, Damage of Corroded is surveyed
The direction x and y of amount probe 7 remains unchanged.The rate travel v of the measuring probe of Damage of Corroded are as follows:
V=dresf (1)
In formula, dresFor the resolution ratio of preassigned Damage of Corroded monitoring, unit m.It is recommended that 0.1mm≤dres≤ 10m,
M i.e. 10-4m≤dres≤10-2m.F is the sample frequency of magnetic sensor 1, f >=1000Hz.
(2) in 6 section of the drag-line of selection, position of the Damage of Corroded measuring probe 7 on drag-line 6 is zi=dresI,
Wherein i=0 ... n, n indicate that the section has monitored, and need number to be tested, obtain the magnetic induction density B in the direction x, y and zx(zi),
By(zi) and Bz(zi)。
(3) total magnetic induction density B is calculatedt(zi):
(4) position z in 6 section of drag-line selectediThe gradient of the magnetic induction intensity at place in the z-direction:
In formula, Bx(zi) and Bx(zi-1) it is respectively position ziAnd zi-1The magnetic induction intensity in the direction x at place；By(zi) and By
(zi-1) it is respectively position ziAnd zi-1Locate the magnetic induction intensity in the direction y；Bz(zi) and Bz(zi-1) it is respectively position ziAnd zi-1The z at place
The magnetic induction intensity in direction, Bxz(zi), Byz(zi) and Bzz(zi) it is respectively Bx(zi), By(zi), Bz(zi) gradient in the z-direction；
(5) position z in 6 section of drag-line selectediThe gradient of total magnetic induction intensity at place in the z-direction:
(6) after the completion of testing, the magnetic field gradient of the drag-line 6 of test section is averaged:
In formula, E (| Bxz,j|)、E(|Byz,j|)、E(|Bzz,j|) and E (| Btz,j|) it is respectively Bxz(zi), Byz(zi)、Bzz
(zi) and Btz(zi) average value of absolute value in test section；
(7) the Damage of Corroded rate of drag-line 6 is calculated by four magnetic field gradients respectively:
In formula, ηxz,j、ηyz,j、ηzz,jAnd ηtz,jRespectively pass through Bxz(zi), Byz(zi)、Bzz(zi) and Btz(zi) four class magnetic
The corrosion ratio that field gradient is calculated, kjIt is relevant at a distance from drag-line 6 steel wire center to 1 center probe of magnetic sensor
Correction factor；kjCalculation formula is as follows:
In formula, sj-1And sjJth -1 time monitoring and 6 center of drag-line in jth time monitoring process to magnetic sensor 1 respectively
The distance of center probe；
(8) the Damage of Corroded rate of drag-line 6 is calculated
(9) pass through the 6 Damage of Corroded rate of drag-line of selection sectionWith the limit corrosion ratio η of permissionlimComparison carries out safety
Evaluation and early warning；
(10) operation that all sections of 5 drag-line 6 of cable-stayed bridge are carried out with step (2)-(9), calculates separately to obtain 6 institute of drag-line
There is the corrosion ratio of section, carries out safety evaluation and early warning respectively.Wherein, corrosion ratio is Damage of Corroded rate, since corrosion causes
The weight of drag-line loss and the ratio of initial weight, i.e., the drag-line weight/initial weight measured when this is monitored.
(11) by periodic monitoring, the operation of step (2)-(10) is carried out every time, what is changed over time is a series of
Corrosion ratio calculates the corrosion ratio gradient changed over time, by the evolution of corrosion ratio, can carry out commenting for 6 Damage of Corroded rate of drag-line
Valence and early warning.
It is above-mentioned that cable-stayed bridge cable Damage of Corroded monitoring system and monitoring method are proposed based on magnetic field gradient tensor, pass through corrosion
Damage measuring probe 7 is moved along drag-line 6, measures the magnetic induction intensity of drag-line 6, calculating magnetic field gradient further obtains drag-line 6
Damage of Corroded rate, can quantitatively realize 6 Damage of Corroded of drag-line monitor, solve 5 drag-line of cable-stayed bridge, 6 Damage of Corroded magnetic field prison
In survey can not Quantitative Monitoring the problem of, do not need to clear up tested component surface iron rust greasy dirt, surface paint and coating before monitoring
It without removal, can be detected with holding member original appearance, not need to apply magnetizing equipment, be changed by magnetic induction intensity by counting
6 corrosion ratio of drag-line is calculated according to control system 9, early warning is carried out to 6 Damage of Corroded of drag-line.The present invention provides a kind of new oblique pulls
The method of 5 drag-line of bridge, 6 Damage of Corroded monitoring, number of devices needed for monitoring system is few, lays easy, and monitoring is accurate.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (4)
1. a kind of cable-stayed bridge cable Damage of Corroded based on magnetic field gradient tensor monitors system, which is characterized in that damaged including corrosion
Hurt measuring probe, data transmission system and data control system；
The Damage of Corroded measuring probe can move along drag-line and measure the magnetic induction intensity of drag-line, and by magnetic induction intensity
Information is transmitted to the data transmission system；
The magnetic induction intensity information is transmitted to the data control system again by the data transmission system；
Drag-line is further calculated according to the magnetic induction intensity information calculating magnetic field gradient in the control control system
Damage of Corroded rate, and then safe early warning is carried out to the Damage of Corroded of drag-line.
2. the cable-stayed bridge cable Damage of Corroded according to claim 1 based on magnetic field gradient tensor monitors system, feature
It is, the Damage of Corroded measuring probe includes:
Shell；
Magnetic sensor is set in the shell, for measuring the magnetic induction intensity of drag-line；
Wireless data transfer module is set in the shell, and the magnetic induction intensity information for will measure is transferred to the data
Transmission system；
Microprocessor is set in the shell, for controlling the magnetic sensor and the wireless data transfer module；And
Power supply is set in the shell, for being the magnetic sensor, the wireless transport module and the microprocessor
Electric energy is provided.
3. the cable-stayed bridge cable Damage of Corroded according to claim 2 based on magnetic field gradient tensor monitors system, feature
It is, the shell is cuboid, and the magnetic sensor is set at the geometric center of the shell, the three axis magnetic sensing
The x, y and z axes of device are parallel with the height of the shell, width and length direction.
4. a kind of cable-stayed bridge cable Damage of Corroded monitoring method based on magnetic field gradient tensor, which is characterized in that including walking as follows
It is rapid:
(1) drag-line is divided into several sections to be monitored, since certain section one end of drag-line, Damage of Corroded measuring probe along
The other end of drag-line towards section at the uniform velocity moves, and the xoz plane of Damage of Corroded measuring probe is parallel with vertical guide, Damage of Corroded measurement
Always and relative distance parallel with the length direction of drag-line remains unchanged in the direction z of probe, along a drag-line moving process
In, the direction x and y of Damage of Corroded measuring probe remains unchanged, the rate travel v of the measuring probe of Damage of Corroded are as follows:
V=dresf (1)
In formula, dresFor the resolution ratio of preassigned Damage of Corroded monitoring, f is the sample frequency of magnetic sensor；
(2) in the drag-line section of selection, position of the Damage of Corroded measuring probe on drag-line is zi=dresI, wherein i=
0 ... n, n indicate that the section has monitored need number to be tested, obtain the magnetic induction density B in the direction x, y and zx(zi), By(zi) and
Bz(zi)；
(3) total magnetic induction density B is calculatedt(zi):
(4) position z in the drag-line section selectediThe gradient of the magnetic induction intensity at place in the z-direction:
In formula, Bx(zi) and Bx(zi-1) it is respectively position ziAnd zi-1The magnetic induction intensity in the direction x at place；By(zi) and By(zi-1) point
It Wei not position ziAnd zi-1Locate the magnetic induction intensity in the direction y；Bz(zi) and Bz(zi-1) it is respectively position ziAnd zi-1The direction z at place
Magnetic induction intensity, Bxz(zi), Byz(zi) and Bzz(zi) it is respectively Bx(zi), By(zi), Bz(zi) gradient in the z-direction；
(5) position z in the drag-line section selectediThe gradient of total magnetic induction intensity at place in the z-direction:
(6) after the completion of testing, the magnetic field gradient of the drag-line of test section is averaged:
In formula, E (| Bxz,j|)、E(|Byz,j|)、E(|Bzz,j|) and E (| Btz,j|) it is respectively Bxz(zi), Byz(zi)、Bzz(zi) and
Btz(zi) average value of absolute value in test section；
(7) the Damage of Corroded rate of drag-line is calculated by four magnetic field gradients respectively:
In formula, ηxz,j、ηyz,j、ηzz,jAnd ηtz,jRespectively pass through Bxz(zi), Byz(zi)、Bzz(zi) and Btz(zi) four class magnetic field gradients
The corrosion ratio being calculated, kjFor amendment relevant at a distance from drag-line steel wire center to magnetic sensor center probe system
Number；kjCalculation formula is as follows:
In formula, sj-1And sjJth -1 time monitoring and drag-line center in jth time monitoring process to magnetic sensor center probe respectively
Distance；
(8) the Damage of Corroded rate of drag-line is calculated
(9) pass through the drag-line Damage of Corroded rate of selection sectionWith the limit corrosion ratio η of permissionlimComparison carries out safety evaluation
And early warning；
(10) it is monitored calculating according to all sections of the abovementioned steps to cable-stayed bridge cable, respectively obtains all sections of drag-line
Corrosion ratio carries out safety evaluation and early warning respectively；
(11) it is calculated by periodic monitoring, a series of corrosion ratio changed over time calculates the corrosion changed over time
Rate gradient carries out the evaluation and early warning of drag-line Damage of Corroded rate by the evolution of corrosion ratio.
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| CN113030240A (en) * | 2021-05-24 | 2021-06-25 | 中铁大桥科学研究院有限公司 | Beidou mode cable-stayed bridge cable force damage identification method and related equipment |
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