CN106289589A - Tension integral structure round bar component prestress detection method based on magnetoelasticity - Google Patents
Tension integral structure round bar component prestress detection method based on magnetoelasticity Download PDFInfo
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- CN106289589A CN106289589A CN201610857706.9A CN201610857706A CN106289589A CN 106289589 A CN106289589 A CN 106289589A CN 201610857706 A CN201610857706 A CN 201610857706A CN 106289589 A CN106289589 A CN 106289589A
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- magnetic core
- round bar
- integral structure
- bar component
- detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
- G01L1/127—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress by using inductive means
Abstract
The present invention provides a kind of tension integral structure round bar component prestress detection method based on magnetoelasticity, belongs to prestress detection technical field.The method relates to excitation magnetic core and detection magnetic core two parts, and by excitation magnetic core provides a certain size exciting current, when round bar prestressing force varies in size, detection magnetic core will have different output voltage values.By analyzing the size of detection magnetic core output voltage values, just can obtain the size of axial prestress at round bar transducer arrangements, and then obtain the stress distribution of total.Present invention measurement prestressed for tension integral structure, it is judged that the mechanical property of tension integral structure has important using value it can also be used to the monitoring in real time of component internal stress is to realize security evaluation during malformation.
Description
Technical field
The present invention relates to prestress detection technical field, particularly relate to a kind of tension integral structure based on magnetoelasticity circle
Bar component prestress detection method.
Background technology
Tension integral structure is a class lightweight, network-like prestressed spatial structure system, by the rope component of prestretched and
Precompressed bar component is connected with each other and forms.Tension integral structure is since mid-term in 20th century occurs, at artistic sculpture, building knot
The aspects such as structure, aerospace engineering, structure of intelligence, new material model and biomechanics modeling create important application.Stretch-draw is overall
The integral rigidity of tension integral structure can be caused appreciable impact by the prestressed size of structural elements, thus affects stretch-draw entirety knot
The mechanical response of structure.The method of traditional measurement tension integral structure is patch strain gauge method, and the method operation complexity is inconvenient for.
To this end, the invention discloses a kind of tension integral structure prestress detection method based on magnetoelasticity.
Summary of the invention
It is pre-that the technical problem to be solved in the present invention is to provide a kind of tension integral structure round bar component based on magnetoelasticity
Stress mornitoring method, the method is respectively arranged excitation magnetic core and detection magnetic core inside and outside round bar component, by analyzing detection magnetic
The output voltage values size of core, thus judge the axial prestressed size of component, and then obtain the stress distribution of total.
The sensor that the method relates to is divided into excitation system and detecting system, excitation system to be connected with excitation magnetic core, detection
System is connected with detection magnetic core, and the method specifically comprises the following steps that
(1) according to the specification of tested tension integral structure round bar component, excitation magnetic core and the detection magnetic of suitable dimension is selected
Core, excitation magnetic core is fixed on tension integral structure round bar component inside measure internal stress size (component bears axial internal stress,
Size is the most equal), detection magnetic core be fixed on outside tension integral structure round bar component with excitation magnetic core corresponding position；
(2) excitation magnetic core and tension integral structure round bar component axis layout at 45 °, detection magnetic core and excitation magnetic core phase
It is arranged vertically mutually, and detection magnetic core is mutually aligned with excitation core center, it is ensured that excitation magnetic core and detection magnetic core are overall with stretch-draw
The air gap that structure round bar component surface is certain；
(3) a certain size alternating current is provided to the coil on excitation magnetic core by power supply, makes the line on excitation magnetic core
Produce a certain size alternating magnetic field on circle, thus in transducer arrangements segment space, all there is a certain size magnetic field；
(4) it is wound around detection coil on detection magnetic core, detects coil access testing system, measure output induced voltage size,
The tension integral structure round bar component being under the action of a magnetic field magnetic characteristic under different stress effects changes, and is perforated through stretch-draw
Overall structure round bar component is detected the magnetic field that magnetic core detects and changes, thus produces induction electric in detection coil
Gesture, by exporting the size of induced voltage, just can obtain tension integral structure round bar component internal stress at this in the axial direction
Value size.
Wherein, tension integral structure round bar component to be detected is that ferromagnetic material is made.
Excitation magnetic core and detection magnetic core all use has the ferrite of good permeance or amorphous magnetic core material is made, and encourages
The coil being wound around on magnetic magnetic core and detection magnetic core is the uniform coiling of copper cash, and coil turn selects to calculate according to the following formula:
Wherein, N is the number of turn of coil, and H is the design magnetic field intensity of coil, and I is exciting current, and l is the average long of magnetic circuit
Degree.
The frequency of the alternating current provided in step (three) is f=1kHz, tests through related experiment, uses frequency f=
During 1kHz, detecting system output situation is preferable.
In step (four), detecting system is connected with oscillograph, and inductive voltage value output on detection coil, by detecting line
Circle accesses certain data processing circuit, and be filtered by detection signal, amplification etc. processes, oscillograph read induced voltage defeated
Go out value.
Having the beneficial effect that of the technique scheme of the present invention:
(1) detection is convenient, uses sensor that mechanical parameter is converted into electricity parameter (voltage) and measures, directly reads
The defecation of magnitude of voltage can obtain the size of corresponding stress value；
(2) non-cpntact measurement, monitors in real time, measures the time short.
Accompanying drawing explanation
Fig. 1 is tension integral structure round bar component prestress detection Method And Principle based on the magnetoelasticity signal of the present invention
Figure；
Fig. 2 is by being detected tension integral structure schematic diagram.
Wherein: 1-power supply；2-excitation system；3-excitation magnetic core；4-tension integral structure round bar component；5-detects magnetic core；
6-detecting system；7-oscillograph.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
The present invention provides a kind of tension integral structure round bar component prestress detection method based on magnetoelasticity.
As it is shown in figure 1, the sensor that the method relates to is divided into excitation system 2 and detecting system 6, excitation system 2 and excitation
Magnetic core 3 is connected, and detecting system 6 is connected with detection magnetic core 5, and the method specifically comprises the following steps that
(1) according to the specification of tested tension integral structure round bar component 4, excitation magnetic core 3 and the detection of suitable dimension is selected
Magnetic core 5, is fixed on tension integral structure round bar component 4 internal measurement internal stress size by excitation magnetic core 3, and detection magnetic core 5 is fixed
With excitation magnetic core 3 corresponding position outside tension integral structure round bar component 4；
(2) excitation magnetic core 3 and tension integral structure round bar component 4 axis layout at 45 °, detection magnetic core 5 and excitation magnetic core
3 are mutually perpendicular to arrange, and detection magnetic core 5 is mutually aligned with excitation magnetic core 3 center, it is ensured that excitation magnetic core 3 and detection magnetic core 5 with open
Drawing the air gap on overall structure round bar component 4 surface, as in figure 2 it is shown, be triangular prism tension integral structure, wherein middle white is hollow
Part is round bar to be detected；
(3) provide alternating current to the coil on excitation magnetic core 3 by power supply 1, make to produce on the coil on excitation magnetic core 3
Raw alternating magnetic field, thus in transducer arrangements segment space, all there is magnetic field；
(4) it is wound around detection coil on detection magnetic core 5, detects coil access testing system 6, measure output induced voltage big
Little, tension integral structure round bar component 4 magnetic characteristic under different stress effects being under the action of a magnetic field changes, and is perforated through
Tension integral structure round bar component 4 is detected the magnetic field that magnetic core 5 detects and changes, thus produces sensing in detection coil
Electromotive force, by exporting the size of induced voltage, just can obtain tension integral structure round bar component 4 in the axial direction interior at this
Stress value size.
Wherein, tension integral structure round bar component 4 to be detected is made for ferromagnetic material.
Excitation magnetic core 3 and detection magnetic core 5 all use has the ferrite of good permeance or amorphous magnetic core material is made,
The coil being wound around on excitation magnetic core 3 and detection magnetic core 5 is the uniform coiling of copper cash, and coil turn selects to calculate according to the following formula:
Wherein, N is the number of turn of coil, and H is the design magnetic field intensity of coil, and I is exciting current, and l is the average long of magnetic circuit
Degree.
The frequency of the alternating current provided in step (three) is f=1kHz.
In step (four), detecting system 6 is connected with oscillograph 7, oscillograph 7 read induced voltage output valve.
In specific implementation process, the round bar of tension integral structure is selected to carry out the checking of internal stress detection.According to this
Draw overall structure round bar component to select suitable magnetic core to carry out installation as shown in Figure 1, demarcate according to stress test, obtain this biography
Sensor stress is y=0.2724x+2.8555, R with the relational expression of output voltage signal2=0.9956, wherein x represents output electricity
Pressure signal, unit mV；Y represents stress value, units MPa.When stretch-draw entirety round bar part being carried out stress test with this sensor,
Voltage output value is 103.5mV, then can obtain round bar component stress value size is 31.0MPa.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of without departing from principle of the present invention, it is also possible to make some improvements and modifications, these improvements and modifications are also
Should be regarded as protection scope of the present invention.
Claims (5)
1. a tension integral structure round bar component prestress detection method based on magnetoelasticity, it is characterised in that: the method
The sensor related to is divided into excitation system and detecting system, excitation system to be connected with excitation magnetic core, detecting system and detection magnetic core
Being connected, the method specifically comprises the following steps that
(1) according to the specification of tested tension integral structure round bar component, excitation magnetic core and the detection magnetic core of suitable dimension is selected,
Excitation magnetic core being fixed on tension integral structure round bar component inside and measures internal stress size, it is overall that detection magnetic core is fixed on stretch-draw
With excitation magnetic core corresponding position outside structure round bar component；
(2) excitation magnetic core and tension integral structure round bar component axis layout at 45 °, detection magnetic core is the most vertical with excitation magnetic core
Directly arrange, and detection magnetic core is mutually aligned with excitation core center, it is ensured that excitation magnetic core and detection magnetic core and tension integral structure
The air gap of round bar component surface；
(3) provide alternating current by power supply to the coil on excitation magnetic core, make to produce on the coil on excitation magnetic core alternation magnetic
, thus in transducer arrangements segment space, all there is magnetic field；
(4) it is wound around detection coil on detection magnetic core, detects coil access testing system, measure output induced voltage size, be in
Tension integral structure round bar component under the action of a magnetic field magnetic characteristic under different stress effects changes, and is perforated through stretch-draw overall
Structure round bar component is detected the magnetic field that magnetic core detects and changes, thus produces induction electromotive force in detection coil, logical
Cross the size of output induced voltage, just can obtain tension integral structure round bar component inner-stress value at this in the axial direction big
Little.
Tension integral structure round bar component prestress detection method based on magnetoelasticity the most according to claim 1, its
It is characterised by: described tension integral structure round bar component to be detected is that ferromagnetic material is made.
Tension integral structure round bar component prestress detection method based on magnetoelasticity the most according to claim 1, its
It is characterised by: described excitation magnetic core all uses ferrite or the amorphous magnetic core material system with good permeance with detection magnetic core
Becoming, the coil that excitation magnetic core and detection magnetic core are wound around is the uniform coiling of copper cash, and coil turn selects to calculate according to the following formula:
Wherein, N is the number of turn of coil, and H is the design magnetic field intensity of coil, and I is exciting current, and l is the average length of magnetic circuit.
Tension integral structure round bar component prestress detection method based on magnetoelasticity the most according to claim 1, its
It is characterised by: the frequency of the alternating current provided in described step (three) is f=1kHz.
Tension integral structure round bar component prestress detection method based on magnetoelasticity the most according to claim 1, its
It is characterised by: in described step (four), detecting system is connected with oscillograph, oscillograph reads induced voltage output valve.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108035612A (en) * | 2018-01-03 | 2018-05-15 | 北京科技大学 | A kind of quadrangular shape tension integral structure portable functional tent |
| CN109238517A (en) * | 2018-08-27 | 2019-01-18 | 太原理工大学 | A kind of detection device and detection method of anchor axial force |
| CN109696467A (en) * | 2019-01-29 | 2019-04-30 | 中国人民解放军国防科技大学 | F rail stress detection method and device based on magnetoelastic effect |
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| CN103868630A (en) * | 2014-03-14 | 2014-06-18 | 招商局重庆交通科研设计院有限公司 | Inverse magnetostrictive effect-based suspender tension sensor and tension measuring method thereof |
| JP2014153241A (en) * | 2013-02-12 | 2014-08-25 | Kenichi Tajima | Complex permeability measuring apparatus, and measuring method and application of the same |
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| US2912642A (en) * | 1953-04-18 | 1959-11-10 | Asea Ab | Method and device for indicating and measuring mechanical stresses within ferro-magnetic material |
| JP2014153241A (en) * | 2013-02-12 | 2014-08-25 | Kenichi Tajima | Complex permeability measuring apparatus, and measuring method and application of the same |
| CN103868630A (en) * | 2014-03-14 | 2014-06-18 | 招商局重庆交通科研设计院有限公司 | Inverse magnetostrictive effect-based suspender tension sensor and tension measuring method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108035612A (en) * | 2018-01-03 | 2018-05-15 | 北京科技大学 | A kind of quadrangular shape tension integral structure portable functional tent |
| CN108035612B (en) * | 2018-01-03 | 2023-10-10 | 北京科技大学 | Portable functional tent with quadrangular-shaped stretching integral structure |
| CN109238517A (en) * | 2018-08-27 | 2019-01-18 | 太原理工大学 | A kind of detection device and detection method of anchor axial force |
| CN109696467A (en) * | 2019-01-29 | 2019-04-30 | 中国人民解放军国防科技大学 | F rail stress detection method and device based on magnetoelastic effect |
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