CN104062043A - Magnetoelastic cable force sensor capable of measuring in sliding mode in circumferential direction and measuring system thereof - Google Patents
Magnetoelastic cable force sensor capable of measuring in sliding mode in circumferential direction and measuring system thereof Download PDFInfo
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- CN104062043A CN104062043A CN201410257775.7A CN201410257775A CN104062043A CN 104062043 A CN104062043 A CN 104062043A CN 201410257775 A CN201410257775 A CN 201410257775A CN 104062043 A CN104062043 A CN 104062043A
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Abstract
The invention discloses a magnetoelastic cable force sensor capable of measuring in a sliding mode in the circumferential direction and a measuring system of the magnetoelastic cable force sensor. The magnetoelastic cable force sensor is mainly composed of a single U-shaped electromagnet and a sliding rail cylinder in a packaging mode. The measurement method includes the steps that the U-shaped electromagnet is separated from a bridge cable through a rocker, a packaging cover is rotated, the electromagnet is lowered and is fixed to the surface of the bridge cable, sensing signals at the moment are collected, the above steps are executed repeatedly, measuring in at least twelve different directions is finished, the obtained sensing signals are subjected to integral respectively and then are subjected to weighted average, the obtained value serves as the effective integral voltage value and is substituted into the stress-integral voltage reaction of the bridge cable, and the bridge cable stress value can be obtained. Due to the fact that the sensor structure is detachable, installation is convenient, the electromagnet in the packaging can conduct measuring in the sliding mode in the circumferential direction, the influence of the special structure of the bridge cable on the measuring result can be reduced extremely and even eliminated, and the stress value of bridge cables with non-circular cross sections can be measured precisely.
Description
Technical field
The present invention relates to field of non destructive testing, the body rope and the xsect that are adapted to built bridge are the stress measurement of non-circular all size cable wire, are specifically related to magnetic bullet cable tension sensor and measuring system thereof that a kind of circumferential slip is measured.
Background technology
Bridge rope is as the important load-carrying member of cable-stayed bridge, be subject to for a long time the impact of factor such as shake of alterante stress, wind, very easily cause the excessive or concentrated even damage of the local fatigue of bridge rope, stress, the safety that jeopardizes bridge, and the stress intensity of bridge rope is the important symbol of weighing crossstructure state.
At present, in the stress measurement of oblique pull pontic rope, use more method to have: hydraulic method, determination of pressure sensor, frequency measurement, magnetoelastic effect method (magnetic flux method).The advantage such as output power is large, signal is strong owing to having for wherein magnetoelastic effect method, simple in structure, long service life, overload protection ability are strong and dynamic response is good, increasingly extensive in the application in bridge rope stress measurement field.
The body Cable Structure of the cable-stayed bridge of practical application by some High Strength Steel cables parallel close up, tighten and be encapsulated in high-strength polyester band form, the xsect of its cable wire part is not traditional circle, but regular hexagon.The more telescopic magnetic bullet sensor of application at present, although not affected by cable wire xsect, its on-the-spot installation is difficult to unified demarcation, when its practical application, is restricted.
Number of patent application 01240121.8 discloses a kind of piezomagnetic cable tension sensor of applying in post-tensioning anchor cable system (telescopic magnetic bullet sensor), although can accurately measure the stress value of bridge rope, but shortcoming is before bridge builds up, to install, body rope for built bridge needs on-the-spot coiling, not only waste time and energy, higher to operative employee's technical requirement, and more difficult the unified of coil parameter of realizing demarcated.Number of patent application 200610054598.8 discloses a kind of differential type temperature compensating type bridge cable force on-line testing method and test macro, it has not only solved the problem of traditional magnetic bullet cable tension sensor installation aspect at the scene, also overcome the impact of temperature on measurement result, but due to it and reckon without the singularity of bridge Cable Structure, and measure time need to contrast the bridge rope that another root does not stress, make this sensor can not be applied to the stress measurement of bridge rope.
Summary of the invention
In order to overcome above-mentioned technical barrier, the magnetic bullet cable tension sensor and the measuring system thereof that the object of the present invention is to provide a kind of circumferential slip to measure, it can measure and monitor oblique pull pontic rope stress, can design for the special construction of bridge rope perfectly, reduce or eliminate the measuring error causing due to the singularity of bridge Cable Structure.
The present invention has designed cylindrical shape encapsulating structure according to the architectural feature of bridge rope, its cap is made up of two parts, its the first half has been installed jacking gear, can make " U " shape electromagnet separate or be fixed on bridge rope surface, after two caps are bolted, can on the barrel of dove-tail, circumferentially slide; According to magnetoelastic effect, the stress of cable wire and the magnetic permeability of its material are varied to direct ratio, and magnetic permeability variable quantity and integral voltage are linear; Demarcate if bridge rope is carried out to stress-integral voltage before measuring, can extrapolate Suo Li size by measuring integral voltage value.It is characterized in that measuring process comprises:
(1) by two semicircle barrels by bolted in bridge rope surface;
(2) the lifting rocking bar of cap in rotation, makes " U " shape electromagnet rise to extreme higher position, and upper and lower cap is mounted on barrel, make its form sealing, structure slidably;
(3) fall " U " shape electromagnet and be fixed in bridge rope surface, applying square wave or pulse excitation to drive coil, by the induced voltage collection of magnetic test coil and be stored in database;
(4) rotate lifting rocking bar " U " shape electromagnet is separated with bridge rope, after slip cap, repeating step (3), completes the signals collecting work of at least 12 directions;
(5) by the induced signal collecting for 12 times integration carry out weighted mean respectively, get its value for effective integral magnitude of voltage is as stress judgment criteria, obtain the stress value of bridge rope according to cable stress-integral voltage calibration curve.
The measuring system that realizes above-mentioned steps, is characterized in that: this system comprises magnetic bullet sensor, one-level filter amplification circuit, analog integrator circuit, secondary filter amplifying circuit, A/D conversion and the acquisition system, signal processing software, the display screen that connect successively.
The invention has the beneficial effects as follows, sensor can not only be adapted to conventional circular cable wire, and being also adapted to oblique pull pontic rope and xsect is the force measurement of answering of non-circular all size cable wire, and simple in structure, easy for installation, and antijamming capability is strong.
Brief description of the drawings
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is oblique pull pontic Cable Structure schematic diagram;
Fig. 2 is sensor diagrammatic cross-section;
Fig. 3 is sensors sides structural map;
Fig. 4 is measuring system schematic diagram;
Fig. 5 is integral voltage oscillogram.
1. drive coils in figure, 2. magnetic test coil, 3. bridge rope, 4. go up cap, 5. descend cap, 6. jacking gear, 7. " U " shape electromagnet (or yoke), 8. magnetic pole, 9. dovetail groove, 10. barrel, 11. aviation plugs, 12. one-level filter amplification circuit, 13. analog integrator circuits, 14. secondary filter amplifying circuits, 15. A/D conversion and acquisition systems, 16. signal processing softwares, 17. display screens.
Embodiment
Bridge rope stress measurement device of the present invention, its measuring principle is the magnetoelastic effect (counter magnetostriction effect, piezomagnetic effect) based on ferrimagnet, in the time that ferrimagnet is magnetized in external magnetic field, if its stress state changes (pulling force, pressure or torsion), also corresponding change of its parameter of magnetic characteristic (relative permeability, coercive force, remanent magnetism etc.).The stress of cable wire and the magnetic permeability of its material are varied to direct ratio, and magnetic permeability variable quantity and integral voltage are linear, if bridge rope is carried out to stress before measuring---and integral voltage is demarcated, and can measure integral voltage value by acquisition and obtain Suo Li size.
As shown in Figure 1, the structure of the oblique pull pontic rope of practical application has comprised that xsect is orthohexagonal cable wire part, after once traditional bypass type sensor is installed and is fixed, can only measure in some directions, if be mounted to A place, due to probe and the distance of cable wire less, induced signal maximum now; If probe is mounted to B place, induced signal minimum, and in actual installation process; because the protective seam outside cable wire stops; the installation site of sensor has no way of finding out about it, and the sensor that this employing single direction is measured will probably cause erroneous judgement to the stress state of bridge rope in the time that stress is evaluated.
In order to reduce or to eliminate the impact apart from measurement result of lifting from due to probe and cable wire, at least should measure in 12 directions, after being averaged, all measurement results can eliminate the effects of the act, and its measuring process comprises:
(1) by two semicircle barrels 10 by bolted in bridge rope surface;
(2) the lifting rocking bar 6 of cap 4 in rotation, makes " U " shape electromagnet 7 rise to extreme higher position, upper and lower encapsulation 4,5 is installed and is placed on barrel 10, makes it form a sealing, structure slidably;
(3) fall " U " shape electromagnet 7 and be fixed in bridge rope 3 surfaces, applying square wave or pulse excitation to drive coil 1, by the induced voltage collection of magnetic test coil 2 and be stored in signal processing software 16;
(4) rotate lifting rocking bar 6 " U " shape electromagnet 7 is separated with bridge rope 3, cap 4 is slided 30 ° and spent, repeating step (3), completes the signals collecting work of at least 12 directions;
(5) by the integration carry out weighted mean respectively of 12 groups of induced signals in signal processing software 16, as effective integral magnitude of voltage, bridge rope stress-integral voltage relational expression that substitution is stored in database 18 in advance draws the now stress value of bridge rope 3.
As shown in Figure 2, sensor is fixed on bridge rope 3 surfaces by barrel 10 to magnetic bullet sensor schematic diagram of the present invention, and its edge is carved with annular dovetail slot 9.Upper and lower two caps 4,5 are spliced by bolt and are positioned on barrel 10, and can be free to slide by dovetail groove 9.Wherein, two jacking gears 6 are also installed in upper cap 4, can have been made " U " shape electromagnet 7 separate or be anchored on bridge rope 3 surface and 1 aviation plug 11 is connected with drive coil 1 and magnetic test coil 2 respectively.
In the structural map shown in Fig. 3, two semicircle barrels 10, all having semicircle clasp near its external port place, after two barrels 10 close up, can and be fixed on bridge rope 3 surfaces by bolt fastening.
As shown in Figure 4, measuring system of the present invention comprises magnetic bullet sensor, one-level filter amplification circuit 12, analog integrator circuit 13, secondary filter amplifying circuit 14, A/D conversion and the acquisition system 15, signal processing software 16, the display screen 17 that connect successively.
Before implementing to measure, should use the bridge rope of same specification in the range of stress of its work, to carry out static tension experiment, using this sensor to carry out stress---the demarcation of integral voltage, is deposited in signal processing software 16, as the stress evaluation criterion of actual measurement.
While implementing to measure, the positive and negative or pulsed magnetic field being produced by drive coil 1 forms closed magnetic circuit in " U " shape electromagnet 7 and bridge rope 3, and bridge rope 3 is magnetized, and magnetic test coil 2 produces induction electromotive force (stress information that this induced signal has comprised bridge rope) immediately.Measuring system taking pumping signal as square-wave signal is example, the induced signal of 12 directions that magnetic test coil 2 picks up, after one-level filter amplification circuit 12, as input end access analog integrator circuit 13, this integrating circuit will be changed by A/D and acquisition system 15 gathers and be saved in signal processing software 16 by secondary filter amplifying circuit 14 is rear after original induced signal integration, and its oscillogram as shown in Figure 5.Acquisition software extracts the maximal value place of integral voltage waveform as the integral voltage value of a direction measurement, by the integral voltage value weighted mean of 12 directions, as effective integral voltage value, and it brings the demarcation relational expression in signal processing software 16 into, draws the now stress value of bridge rope 3.
Claims (6)
1. a magnetic bullet cable tension sensor that circumferentially slides and measure, is characterized in that: sensor construction is mainly made up of list " U " shape electromagnet and the encapsulation of slide rail tubular.
2. the magnetic bullet cable tension sensor that a kind of circumferential slip according to claim 1 is measured, is characterized in that: single " U " shape electromagnet separates by jacking gear and is fixed on cable surface.
3. the magnetic bullet cable tension sensor that a kind of circumferential slip according to claim 1 is measured, it is characterized in that: slide rail type cap makes electromagnet can circumferentially slide and complete the measurement of at least 12 directions, thereby reduce the impact of the probe lift off was more difference causing due to the special construction of bridge rope on measurement result.
4. the magnetic bullet cable tension sensor that a kind of circumferential slip according to claim 1 is measured, is characterized in that: the body rope and the xsect that are adapted to built bridge are the force measurement of answering of non-circular all size cable wire.
5. the magnetic bullet cable tension sensor that a kind of circumferential slip according to claim 1 is measured, its measuring process comprises:
(1) by two semicircle barrels by bolted in bridge rope surface;
(2) the lifting rocking bar of cap in rotation, makes " U " shape electromagnet rise to extreme higher position, upper and lower encapsulation is installed and is placed on barrel, make its form sealing, structure slidably;
(3) fall " U " shape electromagnet and be fixed in bridge rope surface, applying square wave or pulse excitation, gathering and preserve its induced signal data;
(4) rotate lifting rocking bar " U " shape electromagnet is separated with bridge rope, after rotation cap, repeating step (3), completes the signals collecting of at least 12 directions;
(5) by the induced signal collecting for 12 times integration carry out weighted mean respectively, get its value for effective integral magnitude of voltage is as stress judgment criteria, substitution bridge rope stress-integral voltage relational expression draws the now stress value of bridge rope.
6. the magnetic bullet cable force measurement system that circumferential slip according to claim 1 is measured, is characterized in that: this system comprises the magnetic bullet sensor, one-level filter amplification circuit, analog integrator circuit, secondary filter amplifying circuit, A/D conversion and acquisition system, signal processing software and the display screen that connect successively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410257775.7A CN104062043B (en) | 2014-06-11 | 2014-06-11 | Magnetic bullet cable tension sensor and measuring system thereof that a kind of circumferential slip is measured |
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| CN104062043B CN104062043B (en) | 2016-05-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092383A (en) * | 2016-06-23 | 2016-11-09 | 南昌航空大学 | Magnetic bullet cable force measurement method and restructural magnetic-elastic stress sensor thereof |
| CN106644229A (en) * | 2017-01-20 | 2017-05-10 | 华中科技大学 | In-service cable force detecting device and method |
| CN109385956A (en) * | 2017-08-08 | 2019-02-26 | 尹恒 | A kind of intelligent Suspenders or cable construction of built-in quantity sensor monitor stress of extending |
| CN109682505A (en) * | 2019-01-31 | 2019-04-26 | 重庆大学 | A kind of cable force measurement device |
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| CN103499404A (en) * | 2013-10-10 | 2014-01-08 | 南昌航空大学 | Measuring device and measuring method for alternating stress of ferromagnetic component |
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2014
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| US3871217A (en) * | 1973-04-25 | 1975-03-18 | Rucker Co | Continuous cable tension monitor |
| CN2476011Y (en) * | 2001-05-23 | 2002-02-06 | 祝向永 | Piezomagnetic cable tension sensor for post-tensioning anchor cable system |
| CN201237962Y (en) * | 2008-07-11 | 2009-05-13 | 华中科技大学 | Magnetizing assembly for stay cable |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092383A (en) * | 2016-06-23 | 2016-11-09 | 南昌航空大学 | Magnetic bullet cable force measurement method and restructural magnetic-elastic stress sensor thereof |
| CN106644229A (en) * | 2017-01-20 | 2017-05-10 | 华中科技大学 | In-service cable force detecting device and method |
| CN106644229B (en) * | 2017-01-20 | 2022-09-20 | 华中科技大学 | In-service cable force detection device and method |
| CN109385956A (en) * | 2017-08-08 | 2019-02-26 | 尹恒 | A kind of intelligent Suspenders or cable construction of built-in quantity sensor monitor stress of extending |
| CN109682505A (en) * | 2019-01-31 | 2019-04-26 | 重庆大学 | A kind of cable force measurement device |
| CN109682505B (en) * | 2019-01-31 | 2024-05-17 | 重庆大学 | Cable force measuring device |
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| CN104062043B (en) | 2016-05-18 |
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