CN103868630A - Inverse magnetostrictive effect-based suspender tension sensor and tension measuring method thereof - Google Patents
Inverse magnetostrictive effect-based suspender tension sensor and tension measuring method thereof Download PDFInfo
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- CN103868630A CN103868630A CN201410095337.5A CN201410095337A CN103868630A CN 103868630 A CN103868630 A CN 103868630A CN 201410095337 A CN201410095337 A CN 201410095337A CN 103868630 A CN103868630 A CN 103868630A
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Abstract
An inverse magnetostrictive effect-based suspender tension sensor consists of two clamps, a connecting rod, two excitation coils and a detecting coil; a clamping part is formed at one end of each clamp, a connecting part is formed at the other end of each clamp, and the clamps are fixedly connected with a suspender to be measured by the clamping parts and are connected with the connecting rod by the connecting parts; the excitation coils are wound between the connecting parts and the clamping parts of the clamps; the detecting coil is wound between the two connecting parts on the connecting rod; the connecting rod forms a yoke, the clamps form magnetic poles, and the yoke, the two magnetic poles and the suspender to be measured between the two magnetic poles form a closed magnet loop. The inverse magnetostrictive effect-based suspender tension sensor has the beneficial technical effects of greatly simplifying the mounting process of the tension sensor, widening the application environment of a tensile stress sensor and providing a new means for the stress monitoring of the suspender.
Description
Technical field
The present invention relates to one for rope, the internal stress measuring technique of bar steel member, relates in particular to a kind of steeve tension sensor and measuring method of tensile force thereof based on counter magnetostriction effect.
Background technology
Suspension rod in bowstring arch bridge generally can be made two kinds of rigid hanger or flexible suspension rods.Rigid hanger applicable cases is as follows:
Suspension rod is an axial tension component, make reinforced concrete member and easily produce cracking, and sectional dimension is also larger, therefore often adopt prestressed component, by applying compressive pre-stress to suspension rod, avoids suspension rod to ftracture under load action, is referred to as like this rigid hanger.Flexible suspension rod is to adopt Hight strength cable bundle or steel strand wires, and a bearing tension effect can not pressurized, wider at bridge, suspension rod spacing is large, load is when also large, and it is more convenient to use.No matter be rigid hanger or flexible suspension rod, above its pulling force of Measurement accuracy that all needs.
That can tentatively measure for steeve tension both at home and abroad at present has vibration frequency method and passes through the electromagnetic measurement method of installation sleeve cartridge type magnetic bullet sensor.Vibration frequency method is that the mechanics parameter that acceleration transducer is measured the natural frequency of suspension rod vibration, then utilized suspension rod on suspension rod is installed, and sets up structural model and carries out model analysis to obtain the relation of pulling force and vibration frequency, thereby calculate pulling force.The method is except being indirect metering system, and it is more inconvenient that suspension rod need be measured its frequency ratio by random starting of oscillation, often needs by external drive.
Do the used time when ferromagnetic material is subject to external stress, the geometric parameters such as its length, sectional area and internal stress all can change, and this geometric parameter and internal stress variation finally can cause ferromagnetic material parameter of magnetic characteristic (such as magnetic permeability) to change.In the time that parameter of magnetic characteristic (magnetic permeability) changes due to stressed variation, if be applied with electric magnetization on ferromagnetic material, the variation of measuring its parameter of magnetic characteristic by appropriate ways can instead push away its stress.
The stress measurement based on converse magnetostriction of rope bar steel member research at present and application are still in the starting stage, on suspension rod, common metering system is: take tested suspension rod as iron core, at iron core, inductive coil and field coil are set outward, tested suspension rod be the iron core of field coil be simultaneously also the iron core of inductive coil, this metering system need to need to be socketed in coil outside tested suspension rod, therefore in advance loop sleeve is set on suspension rod in prior art or in the time making or suspension rod is installed, can only on-the-spot coiling, measurement mechanism is installed very trouble, its application and measuring accuracy are limited greatly.
Summary of the invention
For the problem in background technology, the present invention proposes a kind of steeve tension sensor based on counter magnetostriction effect, its structure is: described steeve tension sensor is made up of two fixtures, connecting link, two drive coils and magnetic test coil; Described fixture one end forms clamping part, and the fixture other end forms connecting portion, and fixture is fixedly connected with suspension rod to be measured by clamping part, and fixture is connected with connecting link by connecting portion; Drive coil is wrapped in the position between connecting portion and clamping part on fixture, and magnetic test coil is wrapped in the position between two connecting portions on connecting link; Described connecting link forms yoke, and described fixture forms magnetic pole, and the suspension rod to be measured between yoke, two magnetic poles and two magnetic poles forms the magnetic loop of sealing.
The principle of aforementioned steeve tension sensor is: the suspension rod to be measured between yoke, two of left and right magnetic pole and this two magnetic poles forms after the magnetic loop of sealing, now, only need measure the external carbuncle size that can know that suspension rod to be measured bears under present case to the output induced voltage on magnetic test coil.Than prior art, advantage simple in structure, easy accessibility that structure proposed by the invention has, neither need in the time making or suspension rod is installed, set in advance sensor, do not need on-the-spot coiling yet, can on the suspension rod in operation, install sensor additional very easily, greatly expand sensor based on the counter magnetostriction effect applied environment in stress measurement.
For sensor construction is simplified to make and improve the aesthetic property of sensor, the present invention has also done following improvement on aforementioned schemes basis: axial and the suspension rod axially parallel to be measured of described connecting link.Based on the reason identical with aforementioned improved, the present invention has also proposed following preferred version for the structure of connecting link and fixture: described connecting link axially with clamp shaft to vertical.
The present invention has also proposed following preferred version for connecting link: described connecting link is cuboid, on connecting link, be provided with the mounting hole of two axially parallels, mounting hole shape and connecting portion form fit, connecting portion is plugged in mounting hole, connecting portion and mounting hole interference fit.
Preferably, described clamping part is made up of two clamping pieces, and one of them clamping piece and chuck body are one-piece construction; On two clamping pieces, be all provided with semicircle breach, two semicircle breach by suspension rod double team to be measured interior; Between two clamping pieces, be bolted.
The invention allows for a kind of steeve tension measuring method based on counter magnetostriction effect, the hardware unit that this measuring method relies on is aforesaid steeve tension sensor; Described measuring method is:
1) by aforementioned steeve tension installation of sensors on suspension rod to be measured;
2) regularly steeve tension sensor is applied to electric magnetization, read the output voltage values of steeve tension sensor under current electric magnetization condition, and calculate pulling force;
3) secure threshold of the pulling force calculating and setting is compared: if the pulling force calculating is greater than secure threshold, send alarm; If pulling force is less than secure threshold, the not alarm of only noting down, returns to step 2);
Step 2) in, calculate pulling force σ (t) according to following formula:
Wherein, N
inductionfor number of inductive coil turns; S
hangfor the cross-sectional area of suspension rod to be measured; H
mfor the magnetic field amplitude of electric magnetization; V is the output voltage of steeve tension sensor under current electric magnetization condition; m
1for the single order Taylor expansion coefficient relevant to the material of suspension rod, m
1can obtain by the sample identical with suspension rod material to be measured carried out to emulation experiment.
Useful technique effect of the present invention is: greatly simplified the installation process of the tension sensor based on counter magnetostriction effect, expanded conforming of tension sensor, for the stress monitoring of suspension rod provides a kind of new means.
Accompanying drawing explanation
Fig. 1, structural representation of the present invention;
Fig. 2, clamp structure schematic diagram;
Fig. 3, structural representation of the present invention two;
In figure, the corresponding component names of each mark is respectively: fixture 1, clamping part 1-1, connecting portion 1-2, clamping piece 1-3, connecting link 2, drive coil 3, magnetic test coil 4, suspension rod to be measured 5.
Embodiment
A steeve tension sensor based on counter magnetostriction effect, its structure is: described steeve tension sensor is made up of two fixtures 1, connecting link 2, two drive coils 3 and magnetic test coil 4; Described fixture 1 one end forms clamping part 1-1, and fixture 1 other end forms connecting portion 1-2, and fixture 1 is fixedly connected with suspension rod 5 to be measured by clamping part 1-1, and fixture 1 is connected with connecting link 2 by connecting portion 1-2; Drive coil 3 is wrapped in the position between connecting portion 1-2 and clamping part 1-1 on fixture 1, and magnetic test coil 4 is wrapped in the position between two connecting portion 1-2 on connecting link 2; Described connecting link 2 forms yoke, and described fixture 1 forms magnetic pole, and the suspension rod to be measured 5 between yoke, two magnetic poles and two magnetic poles forms the magnetic loop of sealing.
Further, axial and suspension rod 5 axially parallels to be measured of described connecting link 2.
Further, described connecting link 2 is axially axially vertical with fixture 1.
Further, described connecting link 2 is cuboid, is provided with the mounting hole of two axially parallels on connecting link 2, mounting hole shape and connecting portion 1-2 form fit, and connecting portion 1-2 is plugged in mounting hole, connecting portion 1-2 and mounting hole interference fit.
Further, described clamping part 1-1 is made up of two clamping pieces, and one of them clamping piece and fixture 1 body are one-piece construction; On two clamping pieces, be all provided with semicircle breach, two semicircle breach by suspension rod 5 double teams to be measured interior; Between two clamping pieces, be bolted.
A steeve tension measuring method based on counter magnetostriction effect, related hardware has steeve tension sensor, and described steeve tension sensor is made up of two fixtures 1, connecting link 2, two drive coils 3 and magnetic test coil 4; Described fixture 1 one end forms clamping part 1-1, and fixture 1 other end forms connecting portion 1-2, and fixture 1 is fixedly connected with suspension rod 5 to be measured by clamping part 1-1, and fixture 1 is connected with connecting link 2 by connecting portion 1-2; Drive coil 3 is wrapped in the position between connecting portion 1-2 and clamping part 1-1 on fixture 1, and magnetic test coil 4 is wrapped in the position between two connecting portion 1-2 on connecting link 2; Described connecting link 2 forms yoke, and described fixture 1 forms magnetic pole, and the suspension rod to be measured 5 between yoke, two magnetic poles and two magnetic poles forms the magnetic loop of sealing;
Described monitoring method is:
1) by aforementioned steeve tension installation of sensors on suspension rod 5 to be measured;
2) regularly steeve tension sensor is applied to electric magnetization, read the output voltage values of steeve tension sensor under current electric magnetization condition, and calculate pulling force;
3) secure threshold of the pulling force calculating and setting is compared: if the pulling force calculating is greater than secure threshold, send alarm; If pulling force is less than secure threshold, the not alarm of only noting down, returns to step 2);
Step 2) in, calculate pulling force σ (t) according to following formula:
Wherein, N
inductionfor number of inductive coil turns; S
hangfor the cross-sectional area of suspension rod 5 to be measured; H
mfor the magnetic field amplitude of electric magnetization; V is the output voltage of steeve tension sensor under current electric magnetization condition; m
1for the single order Taylor expansion coefficient relevant to the material of suspension rod, m
1can obtain by the sample identical with suspension rod 5 materials to be measured carried out to emulation experiment.
Aforementioned pulling force computing formula is to derive like this:
In the time taking the excitation field of certain form to carry out axial magnetized to suspension rod, the induction output voltage that the temperature variation of loading external force and material causes is different according to the difference of excitation field; Excitation field can be divided into the situations such as steady magnetic field excitation, recurrent pulses magnetic field excitation and alternating magnetic field excitation;
Owing between the excitation at sensor and inductive coil, electromagnetic induction occurring, according to Faraday's electromagnetic induction law, must allow and change through the magnetic flux of coil, therefore adopt the recurrent pulses formula electric current with certain dutycycle, fixed amplitude to be added on drive coil, thereby produce recurrent pulses formula excitation field,, do not considering under the condition of temperature, the relation acting between pulling force and the sensor output (being integration induced voltage) on suspension rod is illustrated by following formula:
Wherein, V
induction(t) be total output induced voltage; N
inductionfor number of inductive coil turns; μ
0for air permeability; S
emptyfor the clearance area of converse magnetostriction suspension rod sensor section; The magnetic field that H (t) produces for drive coil electric current;
represent changes of magnetic field; μ (0,0) is the magnetic permeability of air under 0 degree Celsius; S
hangfor suspension rod cross-sectional area; m
1for the single order Taylor expansion experiment coefficient relevant to suspension rod material; m
2for the second Taylor series coefficient relevant to the material of suspension rod; σ (t) is for acting on the pulling force on suspension rod;
Above formula to the time from t
0have to t integration:
If H (t)=H
m, H (t
0the H of)=-
m, order
have:
From above formula, induction integral voltage is quadratic function relation with loading external force, in Practical Project, can above formula be reduced to linear function by linear fit, and above formula can be reduced to:
Wherein,
for the voltage constant relevant with number of inductive coil turns, excitation field, cable sectional area, material initial permeability etc.; The output sensitivity S of sensor
sensitivityavailable following formula is expressed:
To above formula, distortion can obtain
Claims (6)
1. the steeve tension sensor based on counter magnetostriction effect, is characterized in that: described steeve tension sensor is made up of two fixtures (1), connecting link (2), two drive coils (3) and magnetic test coil (4); Described fixture (1) one end forms clamping part (1-1), fixture (1) other end forms connecting portion (1-2), fixture (1) is fixedly connected with suspension rod to be measured (5) by clamping part (1-1), and fixture (1) is connected with connecting link (2) by connecting portion (1-2); Drive coil (3) is wrapped in the position between the upper connecting portion (1-2) of fixture (1) and clamping part (1-1), and magnetic test coil (4) is wrapped in the position between upper two connecting portions of connecting link (2) (1-2); Described connecting link (2) forms yoke, and described fixture (1) forms magnetic pole, and the suspension rod to be measured (5) between yoke, two magnetic poles and two magnetic poles forms the magnetic loop of sealing.
2. the steeve tension sensor based on counter magnetostriction effect according to claim 1, is characterized in that: axial and suspension rod to be measured (5) axially parallel of described connecting link (2).
3. the steeve tension sensor based on counter magnetostriction effect according to claim 2, is characterized in that: described connecting link (2) axially axially vertical with fixture (1).
4. the steeve tension sensor based on counter magnetostriction effect according to claim 1, it is characterized in that: described connecting link (2) is cuboid, on connecting link (2), be provided with the mounting hole of two axially parallels, mounting hole shape and connecting portion (1-2) form fit, connecting portion (1-2) is plugged in mounting hole, connecting portion (1-2) and mounting hole interference fit.
5. the steeve tension sensor based on counter magnetostriction effect according to claim 1, is characterized in that: described clamping part (1-1) is made up of two clamping pieces, and one of them clamping piece and fixture (1) body are one-piece construction; On two clamping pieces, be all provided with semicircle breach, two semicircle breach by suspension rod to be measured (5) double team interior; Between two clamping pieces, be bolted.
6. the steeve tension measuring method based on counter magnetostriction effect, it is characterized in that: related hardware has steeve tension sensor, described steeve tension sensor is made up of two fixtures (1), connecting link (2), two drive coils (3) and magnetic test coil (4); Described fixture (1) one end forms clamping part (1-1), fixture (1) other end forms connecting portion (1-2), fixture (1) is fixedly connected with suspension rod to be measured (5) by clamping part (1-1), and fixture (1) is connected with connecting link (2) by connecting portion (1-2); Drive coil (3) is wrapped in the position between the upper connecting portion (1-2) of fixture (1) and clamping part (1-1), and magnetic test coil (4) is wrapped in the position between upper two connecting portions of connecting link (2) (1-2); Described connecting link (2) forms yoke, and described fixture (1) forms magnetic pole, and the suspension rod to be measured (5) between yoke, two magnetic poles and two magnetic poles forms the magnetic loop of sealing;
Described monitoring method is:
1) by aforementioned steeve tension installation of sensors on suspension rod to be measured (5);
2) regularly steeve tension sensor is applied to electric magnetization, read the output voltage values of steeve tension sensor under current electric magnetization condition, and calculate pulling force;
3) secure threshold of the pulling force calculating and setting is compared: if the pulling force calculating is greater than secure threshold, send alarm; If pulling force is less than secure threshold, the not alarm of only noting down, returns to step 2);
Step 2) in, calculate pulling force σ (t) according to following formula:
Wherein, N
inductionfor number of inductive coil turns; S
hangfor the cross-sectional area of suspension rod to be measured (5); H
mfor the magnetic field amplitude of electric magnetization; V is the output voltage of steeve tension sensor under current electric magnetization condition; m
1for the single order Taylor expansion coefficient relevant to the material of suspension rod, m
1can obtain by the sample identical with suspension rod to be measured (5) material carried out to emulation experiment.
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Cited By (11)
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| CN104198283A (en) * | 2014-09-02 | 2014-12-10 | 建研科技股份有限公司 | Pulling-out instrument control method for automatically detecting concrete strength |
| CN106289589A (en) * | 2016-09-27 | 2017-01-04 | 北京科技大学 | Tension integral structure round bar component prestress detection method based on magnetoelasticity |
| CN108342971A (en) * | 2018-04-28 | 2018-07-31 | 招商局重庆交通科研设计院有限公司 | A kind of movable type cement pavement breaker |
| CN109269685A (en) * | 2018-10-21 | 2019-01-25 | 郑州大学 | A kind of concrete stress sensor and its application method |
| CN109387796A (en) * | 2017-08-11 | 2019-02-26 | 本特利内华达有限责任公司 | Improved backlash compensation for magnetostrictive torque sensor |
| CN109799011A (en) * | 2019-03-27 | 2019-05-24 | 东南大学 | A kind of suspension bridge sunpender power measurement device |
| CN110553776A (en) * | 2019-09-12 | 2019-12-10 | 苏州热工研究院有限公司 | Clamp of pipeline support hanger force measuring device and pipeline support hanger force measuring device |
| CN111148976A (en) * | 2017-06-12 | 2020-05-12 | 特拉法格股份公司 | Load measuring method, load measuring device and load measuring arrangement |
| CN112179531A (en) * | 2020-08-21 | 2021-01-05 | 蚌埠恒远传感器科技有限公司 | S-shaped pull pressure sensor |
| CN112556891A (en) * | 2020-11-20 | 2021-03-26 | 中国水利水电科学研究院 | Concrete whole life period internal stress state monitoring device based on film type sensor |
| CN115683436A (en) * | 2022-10-12 | 2023-02-03 | 华能广西清洁能源有限公司 | Three-dimensional force sensor based on inverse magnetostriction effect |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198283A (en) * | 2014-09-02 | 2014-12-10 | 建研科技股份有限公司 | Pulling-out instrument control method for automatically detecting concrete strength |
| CN106289589A (en) * | 2016-09-27 | 2017-01-04 | 北京科技大学 | Tension integral structure round bar component prestress detection method based on magnetoelasticity |
| CN111148976A (en) * | 2017-06-12 | 2020-05-12 | 特拉法格股份公司 | Load measuring method, load measuring device and load measuring arrangement |
| CN111148976B (en) * | 2017-06-12 | 2022-03-25 | 特拉法格股份公司 | Load measuring method, load measuring device and load measuring arrangement |
| CN109387796B (en) * | 2017-08-11 | 2022-06-03 | 本特利内华达有限责任公司 | Improved backlash compensation for magnetostrictive torque sensors |
| CN109387796A (en) * | 2017-08-11 | 2019-02-26 | 本特利内华达有限责任公司 | Improved backlash compensation for magnetostrictive torque sensor |
| CN108342971A (en) * | 2018-04-28 | 2018-07-31 | 招商局重庆交通科研设计院有限公司 | A kind of movable type cement pavement breaker |
| CN108342971B (en) * | 2018-04-28 | 2023-05-09 | 招商局重庆交通科研设计院有限公司 | Portable cement road surface breaker |
| CN109269685A (en) * | 2018-10-21 | 2019-01-25 | 郑州大学 | A kind of concrete stress sensor and its application method |
| CN109269685B (en) * | 2018-10-21 | 2024-03-15 | 郑州大学 | Concrete stress sensor and application method thereof |
| CN109799011A (en) * | 2019-03-27 | 2019-05-24 | 东南大学 | A kind of suspension bridge sunpender power measurement device |
| CN110553776A (en) * | 2019-09-12 | 2019-12-10 | 苏州热工研究院有限公司 | Clamp of pipeline support hanger force measuring device and pipeline support hanger force measuring device |
| CN112179531A (en) * | 2020-08-21 | 2021-01-05 | 蚌埠恒远传感器科技有限公司 | S-shaped pull pressure sensor |
| CN112556891A (en) * | 2020-11-20 | 2021-03-26 | 中国水利水电科学研究院 | Concrete whole life period internal stress state monitoring device based on film type sensor |
| CN112556891B (en) * | 2020-11-20 | 2021-08-17 | 中国水利水电科学研究院 | Concrete whole life period internal stress state monitoring device based on film type sensor |
| CN115683436A (en) * | 2022-10-12 | 2023-02-03 | 华能广西清洁能源有限公司 | Three-dimensional force sensor based on inverse magnetostriction effect |
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Application publication date: 20140618 |