CN107255484A - A kind of novel open-close type magnetic flux transducer and rod member for grid axial force test method - Google Patents
A kind of novel open-close type magnetic flux transducer and rod member for grid axial force test method Download PDFInfo
- Publication number
- CN107255484A CN107255484A CN201710479757.7A CN201710479757A CN107255484A CN 107255484 A CN107255484 A CN 107255484A CN 201710479757 A CN201710479757 A CN 201710479757A CN 107255484 A CN107255484 A CN 107255484A
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- magnetic flux
- construction unit
- rod member
- sensor construction
- flux transducer
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention proposes a kind of novel open-close type magnetic flux transducer and rod member for grid axial force test method, novel open-close type magnetic flux transducer, including two symmetrical semicircular configuration units：First sensor construction unit (1) and second sensor construction unit (2), the first sensor construction unit (1), second sensor construction unit (2) are centrally formed rod member for grid set hole (3)；Rod member for grid axial force test method：The structural parameters for choosing magnetic flux transducer build magnetic flux transducer；Instantaneous induced voltage of the bar material model under different load cases is gathered by magnetic flux transducer, stress permeability curcve is drawn；The current instantaneous induced voltage of rod member for grid to be tested is gathered by magnetic flux transducer, its correspondence magnetic conductivity is determined by instantaneous induced voltage, rod member for grid axle power is determined；The present invention propose more efficiently, efficiently rod member axial force test method, with huge economic benefit.
Description
Technical field
The invention belongs to the technical field of grid structure bar axial force test, and in particular to a kind of novel open-close type magnetic flux
Sensor and rod member for grid axial force test method.
Background technology
With the fast development of China's economy, grid structure is with it from heavy and light, rigidity is big, attractive in appearance, comprehensive skill is enriched in moulding
The series of advantages such as art economic indicator is good and as the first choice of the Important buildings such as all kinds of stadiums, station.With grid structure
The quick increase of quantity, enters to use as a servant the growth of the time limit, and structure is being subjected to the unfavorable shadow of various natures and human factor etc. for a long time
All the health status of structure can be caused to deteriorate under sound.Therefore regularly health is carried out to the various structures used have been put into
Monitoring timely finds to determine its actual service state, handles various potential risks, it is to avoid catastrophic destruction occurs for structure
Tool is of great significance.In current engineering for the mode that grid structure carries out health monitoring mainly include strain gauge method,
The several ways such as frequency method and magnetic flux method.But compared to the health monitoring means of bridge structure comparative maturity, current rack knot
The drawbacks of conventional several health monitoring modes of structure all have respective.The mode of pre-buried foil gauge has foil gauge and uses the longevity
Order not enough major defect, and use by the way of scene stickup foil gauge except to detection band come huge workload in addition to, can not keep away
That exempts from brings substantial amounts of work high above the ground danger coefficient high.The method of frequency method test rod member axle power is due to bolted spherical node complexity
Power transmission pattern, frequency change be can not ignore caused by influence of the surrounding rod member to bending and elastic restraint, and its precision need
In further raising.Therefore a kind of economically feasible is explored, permanently effective grid structure bar axial force test method is the present invention
Main purpose.
The content of the invention
In view of the shortcomings of the prior art, the present invention proposes a kind of novel open-close type magnetic flux transducer and rod member for grid axle power
Method of testing.
A kind of novel open-close type magnetic flux transducer, including two symmetrical semicircular configuration units：First sensor knot
Structure unit (1) and second sensor construction unit (2), the first sensor construction unit (1), second sensor construction unit
(2) it is centrally formed rod member for grid set hole (3)；
Multiple semi-circulars are provided with the outside of the first sensor construction unit (1), second sensor construction unit (2)
Bolt fixing hole (5), the first sensor knot are provided with fixing band (4), two ends of the semi-circular fixing band (4)
Structure unit (1) and second sensor construction unit (2) include excitation coil (6) and induction coil (7), first sensing
One end face of device construction unit (1) and second sensor construction unit (2) is provided with row's needle connector contact pin (8), described
The other end of first sensor construction unit (1) and second sensor construction unit (2) is provided with row's needle connector jack
(9), the excitation coil (6) and induction coil (7) are by arranging needle connector contact pin (8) and arranging needle connector jack (9)
Mating connection is connected, and the inside of the first sensor construction unit (1) is provided with temperature sensor (10), the excitation line
The lead-out wire (11) for enclosing (6) and induction coil (7) is drawn from the end face of first sensor construction unit (1).
A kind of rod member for grid axial force test method, using described novel open-close type magnetic flux transducer, including following step
Suddenly：
Step 1：The structural parameters of magnetic flux transducer are chosen according to the diameter of rod member for grid to be tested, magnetic flux is built
Sensor；
The structural parameters of the magnetic flux transducer include：Excitation coil material specification, induction coil material specification, excitation
The number of turns of coil, the number of turns of induction coil, the winding length of excitation coil, the winding length of induction coil, first
Internal diameter, first sensor construction unit and the second sensor structure list of sensor construction unit and second sensor construction unit
The external diameter of member；
Step 2：According to the actual requirement of engineering of rod member for grid axial force test, selection and rod member for grid identical to be tested
Bar material model；
Step 3：Magnetic flux transducer after building is installed on bar material model, by the excitation of magnetic flux transducer
The lead-out wire connection surge voltage power supply of coil, by the lead-out wire connection voltage acquisition dress of the induction coil of magnetic flux transducer
Put；
Step 4：Instantaneous induced electricity of the bar material model under different load cases is gathered by magnetic flux transducer
Pressure, determines its correspondence magnetic conductivity by instantaneous induced voltage, the magnetic conductivity under different load cases is demarcated, and draws
Stress-permeability curcve；
Step 5：In work progress, the magnetic flux transducer after building is installed on rod member for grid to be tested, will
The lead-out wire connection surge voltage power supply of the excitation coil of magnetic flux transducer, by the extraction of the induction coil of magnetic flux transducer
Line connects voltage collecting device；
Step 6：The current instantaneous induced voltage of rod member for grid to be tested is gathered by magnetic flux transducer, by instantaneous
Induced voltage determines its correspondence magnetic conductivity, and rod member for grid axle power is determined according to stress-permeability curcve of demarcation.
Beneficial effects of the present invention：
The present invention proposes a kind of novel open-close type magnetic flux transducer and rod member for grid axial force test method, and the present invention is solved
The problem that current grid structure faces in service stage health monitoring.Propose it is a kind of more efficiently, efficiently rod member axle power
Method of testing, with huge economic benefit；Magnetic flux transducer proposed by the present invention is made up of two identical minor structures, peace
Assembly and disassembly enhanced convenience is quick, reusable.The use of needle connector is arranged in sensor by excitation coil and the line of induction
Circle each connects into complete loop, it is ensured that the accuracy of measurement result；Magnetic flux transducer section of the present invention
Form uses circular section, can ensure the magnetic field of induction coil and excitation coil to the full extent and not influenceed by section form,
Ensure the stability of measurement result.
Brief description of the drawings
Fig. 1 is the structural representation of novel open-close type magnetic flux transducer in the specific embodiment of the invention；
Fig. 2 is the front view of sensor construction unit in the specific embodiment of the invention；
Fig. 3 is sensor construction cell side front view in the specific embodiment of the invention；
Fig. 4 is the flow chart of rod member for grid axial force test method in the specific embodiment of the invention；
Wherein, 1- first sensors construction unit, 2- second sensors construction unit, 3- rod member for grid set hole, 4- semi-rings
Shape fixing band, 5- bolt fixing holes, 6- excitation coils, 7- induction coils, 8- row's needle connectors contact pin, 9- row's needle connectors are inserted
Hole, 10- temperature sensors, 11- lead-out wires.
Embodiment
The specific embodiment of the invention is described in detail below in conjunction with the accompanying drawings.
Magnetic flux transducer uses comparative maturity, but applied to rack in the health monitoring field of bridge cable force
The health of structural member axle power is unprecedented.The cardinal principle that the inventive method is used is electromagnetic induction principle, passes through electricity
Source is that excitation coil is powered moment, and induction coil can produce instantaneous induced-current and by amplification system due to electromagnetic induction phenomenon
The instantaneous induced voltage on induction coil can be measured.Research shows that the size of instantaneous induced voltage and the magnetic conductance of material are blunt
Correlation is connect, and the magnetic conductivity of material is closely connected with the stress state residing for rod member.
A kind of novel open-close type magnetic flux transducer, as shown in figure 1, including two symmetrical semicircular configuration units：The
One sensor construction unit 1 and second sensor construction unit 2, the first sensor construction unit 1, second sensor structure
Unit 2 is centrally formed rod member for grid set hole 3.
As shown in Figures 2 and 3, the first sensor construction unit 1, the outside of second sensor construction unit 2 are respectively provided with
Have and bolt fixing hole 5 is provided with multiple semi-circular fixing bands 4, two ends of the semi-circular fixing band 4, described first passes
Sensor construction unit 1 and second sensor construction unit 2 include excitation coil 6 and induction coil 7, the first sensor
One end face of construction unit 1 and second sensor construction unit 2 is provided with row's needle connector contact pin 8, first sensing
The other end of device construction unit 1 and second sensor construction unit 2 is provided with row's needle connector jack 9, the excitation line
Mating connection of the circle 6 with induction coil 7 by arranging needle connector contact pin 8 and row's needle connector jack 9 is connected, and described first
The inside of sensor construction unit 1 is provided with temperature sensor 10, the lead-out wire 11 of the excitation coil 6 and induction coil 7 from
The end face of first sensor construction unit 1 is drawn.
In present embodiment, by first sensor construction unit 1 and second sensor construction unit 2 by arranging needle connector
Contact pin 8 and row's needle connector jack 9 are plugged together, and induction coil 6 and excitation coil 7 is each constituted a complete time
Road.The first sensor construction unit 1 linked together and second sensor construction unit 2 are passed through into two semi-circular fixing bands
4 do further reinforcing, using bolt in bolt fixing hole 5 by first sensor construction unit 1 and second sensor construction unit 2
It is fixed.Semi-circular fixing band 4 can play a good protection to magnetic flux transducer, prevent magnetic flux transducer in measurement
During to row needle connector produce destruction.
A kind of rod member for grid axial force test method, as shown in figure 4, comprising the following steps：
Step 1：The structural parameters of magnetic flux transducer are chosen according to the diameter of rod member for grid to be tested, magnetic flux is built
Sensor.
The structural parameters of the magnetic flux transducer include：Excitation coil material specification, induction coil material specification, excitation
The number of turns of coil, the number of turns of induction coil, the winding length of excitation coil, the winding length of induction coil, first
The internal diameter and external diameter of sensor construction unit, the internal diameter and external diameter of second sensor construction unit..
In present embodiment, the material of excitation coil and the material of induction coil are copper cash, and copper wire diameter is 0.3mm,
Between excitation coil and first sensor construction unit and second sensor construction unit, between excitation coil and induction coil it
Between separated with insulating materials.
If the diameter d of rod member for grid to be tested, the number of turns n of excitation coilj=9d, the number of turns of induction coil
nc=2d, the winding length l of excitation coilj=0.3nj(mm), the winding length l of induction coilc=0.3nc(mm), the first sensing
The internal diameter of device construction unit and second sensor construction unit is d0=d+5mm, first sensor construction unit and the second sensing
The external diameter of device construction unit is d1=d0+10mm。
Induction coil is located at the central part of element.
Sensor construction element length L=lj+ 20mm, induction coil and excitation coil are located at the centre of element, the line of induction
Circle and excitation coil two ends respectively reserve 10mm spaces.
Step 2：According to the actual requirement of engineering of rod member for grid axial force test, selection and rod member for grid identical to be tested
Bar material model.
Step 3：Magnetic flux transducer after building is installed on bar material model, by the excitation of magnetic flux transducer
The lead-out wire connection surge voltage power supply of coil, by the lead-out wire connection voltage acquisition dress of the induction coil of magnetic flux transducer
Put.
In present embodiment, the voltage collecting device used is oscillograph.
Step 4：Instantaneous induced electricity of the bar material model under different load cases is gathered by magnetic flux transducer
Pressure, determines its correspondence magnetic conductivity by instantaneous induced voltage, the magnetic conductivity under different load cases is demarcated, and draws
Stress-permeability curcve.
In present embodiment, pass through the induced voltage and the other specification (such as cross-sectional area, temperature) of material of electromagnetic induction
Reflect the stress size of rod member etc. the magnetic conductivity tried to achieve.Shown in relation such as formula (1) between magnetic conductivity and stress：
Wherein, EσFor magnetic strain energy, λSMagnetostriction coefficient, is produced when unmagnetized material is magnetized to saturation, and σ is
Applied stress, θ is the angle of applied stress and the direction of magnetization.
The magnetization of material can be expressed as material magnetic field intensity H and magnetic flux B relation, i.e., for any materials, such as formula
(2) shown in：
Wherein, B is magnetic flux, Wb/m2；For permeability tensor, H is material magnetic field intensity, A/m.
Assuming that ferrimagnet cross-sectional area is As, permanent-magnetic field intensity is H (t), coil cross-sectional area At, excitation coil
The winding number of turns is nj, μ0For space permeability.By faraday's rule, it can obtain causing due to the change of magnetic flux in coil
The voltage resulted from coil, as shown in formula (3)：
If magnetic field is the magnetic permeability μ of isotropism, correspondingly measured materialrIt is represented by as shown in formula (4)：
Wherein, VoutFor the output voltage of measurement, V0For without the output voltage of ferromagnetic material.
Step 5：In work progress, the magnetic flux transducer after building is installed on rod member for grid to be tested, will
The lead-out wire connection surge voltage power supply of the excitation coil of magnetic flux transducer, by the extraction of the induction coil of magnetic flux transducer
Line connects voltage collecting device.
In present embodiment, the voltage collecting device used is oscillograph.
Step 6：The current instantaneous induced voltage of rod member for grid to be tested is gathered by magnetic flux transducer, by instantaneous
Induced voltage determines its correspondence magnetic conductivity, and rod member for grid axle power is determined according to stress-permeability curcve of demarcation.
Claims (2)
1. a kind of novel open-close type magnetic flux transducer, it is characterised in that including two symmetrical semicircular configuration units：First
Sensor construction unit (1) and second sensor construction unit (2), the first sensor construction unit (1), second sensor
Construction unit (2) is centrally formed rod member for grid set hole (3)；
Multiple semi-circulars are provided with the outside of the first sensor construction unit (1), second sensor construction unit (2) to fix
Bolt fixing hole (5), the first sensor structure list are provided with band (4), two ends of the semi-circular fixing band (4)
First (1) and second sensor construction unit (2) include excitation coil (6) and induction coil (7), the first sensor knot
One end face of structure unit (1) and second sensor construction unit (2) is provided with row's needle connector contact pin (8), described first
The other end of sensor construction unit (1) and second sensor construction unit (2) is provided with row's needle connector jack (9),
The cooperation of the excitation coil (6) and induction coil (7) by arranging needle connector contact pin (8) and row's needle connector jack (9)
Connection is connected, and the inside of the first sensor construction unit (1) is provided with temperature sensor (10), the excitation coil
(6) drawn with the lead-out wire (11) of induction coil (7) from the end face of first sensor construction unit (1).
2. a kind of rod member for grid axial force test method, using the novel open-close type magnetic flux transducer described in claim 1, it is special
Levy and be, comprise the following steps：
Step 1：The structural parameters of magnetic flux transducer are chosen according to the diameter of rod member for grid to be tested, magnetic flux sensing is built
Device；
The structural parameters of the magnetic flux transducer include：Excitation coil material specification, induction coil material specification, excitation coil
Number of turns, the number of turns of induction coil, the winding length of excitation coil, the winding length of induction coil, first sensing
The internal diameter of device construction unit and second sensor construction unit, first sensor construction unit and second sensor construction unit
External diameter；
Step 2：According to the actual requirement of engineering of rod member for grid axial force test, selection and rod member for grid identical rod member to be tested
Material model；
Step 3：Magnetic flux transducer after building is installed on bar material model, by the excitation coil of magnetic flux transducer
Lead-out wire connection surge voltage power supply, the lead-out wire of the induction coil of magnetic flux transducer is connected into voltage collecting device；
Step 4：Instantaneous induced voltage of the bar material model under different load cases is gathered by magnetic flux transducer, led to
Cross instantaneous induced voltage determine its correspondence magnetic conductivity, the magnetic conductivity under different load cases is demarcated, and draw stress-
Permeability curcve；
Step 5：In work progress, the magnetic flux transducer after building is installed on rod member for grid to be tested, by magnetic flux
The lead-out wire connection surge voltage power supply of the excitation coil of quantity sensor, the lead-out wire of the induction coil of magnetic flux transducer is connected
Connect voltage collecting device；
Step 6：The current instantaneous induced voltage of rod member for grid to be tested is gathered by magnetic flux transducer, by instantaneously sensing
Voltage determines its correspondence magnetic conductivity, and rod member for grid axle power is determined according to stress-permeability curcve of demarcation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710479757.7A CN107255484A (en) | 2017-06-22 | 2017-06-22 | A kind of novel open-close type magnetic flux transducer and rod member for grid axial force test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710479757.7A CN107255484A (en) | 2017-06-22 | 2017-06-22 | A kind of novel open-close type magnetic flux transducer and rod member for grid axial force test method |
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| CN107255484A true CN107255484A (en) | 2017-10-17 |
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| CN201710479757.7A Pending CN107255484A (en) | 2017-06-22 | 2017-06-22 | A kind of novel open-close type magnetic flux transducer and rod member for grid axial force test method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489641A (en) * | 2018-03-20 | 2018-09-04 | 重庆交通大学 | A kind of prestress wire stress measurement device and method |
| CN109752674A (en) * | 2019-03-07 | 2019-05-14 | 郑州大学 | A kind of pin-connected panel magnetic flux transducer and its application method |
| CN109752672A (en) * | 2019-03-07 | 2019-05-14 | 郑州大学 | A kind of clamp type magnetic flux sensor and its application method |
| CN109752673A (en) * | 2019-03-07 | 2019-05-14 | 郑州大学 | A kind of Split type magnetic flux sensor and its application method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675721A (en) * | 2013-12-24 | 2014-03-26 | 江西飞尚科技有限公司 | Open-loop magnetic flux sensor |
| CN103698720A (en) * | 2013-12-24 | 2014-04-02 | 江西飞尚科技有限公司 | Magnetic flux detecting method for open-loop magnetic flux sensor |
| CN104698402A (en) * | 2015-03-03 | 2015-06-10 | 江西飞尚科技有限公司 | Ribbon cable detection method for magnetic flux of open loop magnetic flux sensor |
| CN105527041A (en) * | 2016-01-31 | 2016-04-27 | 上海强劲地基工程股份有限公司 | Internal force monitoring and automatic measurement system of pre-stress anchor cable |
-
2017
- 2017-06-22 CN CN201710479757.7A patent/CN107255484A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675721A (en) * | 2013-12-24 | 2014-03-26 | 江西飞尚科技有限公司 | Open-loop magnetic flux sensor |
| CN103698720A (en) * | 2013-12-24 | 2014-04-02 | 江西飞尚科技有限公司 | Magnetic flux detecting method for open-loop magnetic flux sensor |
| CN104698402A (en) * | 2015-03-03 | 2015-06-10 | 江西飞尚科技有限公司 | Ribbon cable detection method for magnetic flux of open loop magnetic flux sensor |
| CN105527041A (en) * | 2016-01-31 | 2016-04-27 | 上海强劲地基工程股份有限公司 | Internal force monitoring and automatic measurement system of pre-stress anchor cable |
Non-Patent Citations (1)
| Title |
|---|
| 黄晔 等: "磁通量传感器在体外索力检测中的应用", 《建材技术与应用》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489641A (en) * | 2018-03-20 | 2018-09-04 | 重庆交通大学 | A kind of prestress wire stress measurement device and method |
| CN108489641B (en) * | 2018-03-20 | 2020-06-02 | 重庆交通大学 | Stress measuring device and method for prestressed steel strand |
| CN109752674A (en) * | 2019-03-07 | 2019-05-14 | 郑州大学 | A kind of pin-connected panel magnetic flux transducer and its application method |
| CN109752672A (en) * | 2019-03-07 | 2019-05-14 | 郑州大学 | A kind of clamp type magnetic flux sensor and its application method |
| CN109752673A (en) * | 2019-03-07 | 2019-05-14 | 郑州大学 | A kind of Split type magnetic flux sensor and its application method |
| CN109752672B (en) * | 2019-03-07 | 2024-04-19 | 郑州大学 | Clamping type magnetic flux sensor and application method thereof |
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Application publication date: 20171017 |