CN107741209A - The correction for temperature effect method of thread-vibration type device for sensing displacement - Google Patents
The correction for temperature effect method of thread-vibration type device for sensing displacement Download PDFInfo
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- CN107741209A CN107741209A CN201710944516.5A CN201710944516A CN107741209A CN 107741209 A CN107741209 A CN 107741209A CN 201710944516 A CN201710944516 A CN 201710944516A CN 107741209 A CN107741209 A CN 107741209A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of correction for temperature effect method of thread-vibration type device for sensing displacement, in the case of the method considers different temperatures, by experiment and correlation computations, has drawn the different displacement knots modification of sample.Accordingly, inventor has also designed and produced corresponding test device and has extrapolated corresponding calculation formula.The device mainly includes test vibratory string, soft iron block, magnet, reaction diaphragm, coil, protection sleeve, fastener composition.Using the method for testing and test device, influence of the temperature knots modification to measured displacements knots modification can be fully taken into account.The modification method can measure the displacement knots modification caused by the change of temperature during displacement measurement is carried out to vibratory string class displacement transducer, the degree of accuracy of measurement displacement knots modification is greatly improved, is widely portable to the technical fields such as Test on Bridge Loading, health monitoring.
Description
Technical field
The invention belongs to vibratory string class displacement measurement technical field, more particularly to a kind of temperature shadow of thread-vibration type device for sensing displacement
Ring modification method.
Background technology
In the observation and long-term detection of Geotechnical Engineering and other engineerings, displacement transducer is be unable to do without.Type vibration wire displacement passes
Sensor is one kind of displacement transducer, and its operation principle is to change the active length of test vibratory string by being tested displacement, test
The active length difference of vibratory string causes the vibration frequency for testing vibratory string different, and tested position is measured by measuring the frequency of vibratory string
The size of shifting.
During displacement measurement is carried out to vibratory string class sensor, the change of temperature can be to test result tape before and after test
Carry out larger error, it is therefore desirable to measure test vibratory string displacement knots modification caused by temperature changes to reduce test result
Error.
The content of the invention
The goal of the invention of the present invention is, in view of the above-mentioned problems, the temperature for providing a kind of thread-vibration type device for sensing displacement influences to repair
Correction method, the modification method can be measured during displacement measurement is carried out to vibratory string class displacement transducer due to temperature
Displacement knots modification caused by change.
To reach above-mentioned purpose, the technical solution adopted in the present invention is：A kind of temperature shadow of thread-vibration type device for sensing displacement
Modification method is rung, is comprised the following steps：1) the original length l and area of section s of test vibratory string are measured；2) test is shaken
String tenses and its both ends is fixed on thread-vibration type device for sensing displacement；3) the test vibratory string is measured by frequency measuring equipment
First vibration frequency is f0；4) applying test external force to the test vibratory string makes the test vibratory string produce displacement knots modification Δ l '
So as to change the active length of the test vibratory string, the temperature knots modification that the test vibratory string is measured by temperature measuring equipment is
T, the second vibration frequency that the test vibratory string is measured by frequency measuring equipment is f "；
By formula
Calculate and move knots modification Δ l ', in formula, e is the modulus of elasticity of test vibratory string, and m is the quality of test vibratory string, and α is test
The coefficient of expansion of vibratory string.
As an improvement mode, it is described test vibratory string for test string wire.
As an improvement mode, the temperature knots modification t in the step 2) surveys for the test vibratory string is relatively extraneous
The temperature knots modification in test ring border.
As an improvement mode, the temperature knots modification t in the step 2) is the test vibratory string relative to described
The temperature knots modification of displacement transducer.
As an improvement mode, institute's displacement sensors include test vibratory string, reaction diaphragm and base, the sense
Diaphragm is answered to be fixedly installed on the base, one end of the test vibratory string is fixedly connected with the base, the test vibratory string
The other end connect the reaction diaphragm, the test vibratory string, the reaction diaphragm and described be respectively arranged on the base with temperature
Spend sensor.
As an improvement mode, it is described test vibratory string be fixedly connected with the base by threaded fastener, it is described
Test vibratory string is fixedly connected with the reaction diaphragm by threaded fastener.
Due to using above-mentioned technical proposal, the invention has the advantages that：
The operating procedure of the modification method is simple, during thread-vibration type device for sensing displacement measurement shift value is used, temperature
The measurement result that the change of degree can be measured thread-vibration type device for sensing displacement affects, can be to vibratory string using this method
The measurement result of formula displacement sensor is modified, and is improved the accuracy of the measurement structure of thread-vibration type device for sensing displacement, is made
The shift value finally measured is accurate.
Because the temperature that the temperature knots modification t in the step 4) is the test relatively extraneous test environment of vibratory string changes
Amount, test the relatively extraneous test environment of vibratory string temperature knots modification the measurement result of thread-vibration type device for sensing displacement is caused it is certain
Influence, the modification method can be modified to measurement result.
By the temperature knots modification t in the step 4) be it is described test vibratory string relative to the other knots of institute's displacement sensors
The temperature knots modification of structure, the temperature knots modification of displacement transducer other structures cause to the measurement result of thread-vibration type device for sensing displacement
Certain influence, the modification method can be modified to measurement result.
Because the test vibratory string and the reaction diaphragm and the base are respectively arranged with temperature sensor, pass through three
Individual temperature sensor, which is averaged, can accurately measure temperature variation t.
Brief description of the drawings
Fig. 1 is the overall structure diagram of displacement transducer；
Fig. 2 is the internal structure schematic diagram of displacement transducer；
In accompanying drawing：1- tests vibratory string, 2- protection sleeves, 3- soft iron blocks, 4- magnet, 5- bases, 6- reaction diaphragms, 7- lines
Circle, 8- threaded fasteners.
Embodiment
The invention discloses a kind of correction for temperature effect method of thread-vibration type device for sensing displacement, comprise the following steps：
1) the original length l and area of section s of test vibratory string 1 are measured.
2) test vibratory string 1 is tensed and its both ends is fixed on thread-vibration type device for sensing displacement, displacement transducer includes surveying
Try vibratory string 1, soft iron block 3, magnet 4, coil 7.
3) one end for testing vibratory string 1 is fixedly connected on base 5 by threaded fastener 8, and base 5 is fixed on protection sleeve 2
On, the other end of test vibratory string 1 is fixedly connected by threaded fastener 8 with reaction diaphragm 6, the installation one among test vibratory string 1
Individual soft iron block 3, the magnet 4 for being tied with coil 7 is placed below in soft iron block 3, after energization, the electrical excitation of coil 7 test string wire 1 shakes
Dynamic, the first vibration frequency that test vibratory string 1 is measured by frequency measuring equipment is f0。
4) test external force is applied to thread-vibration type device for sensing displacement, the temperature knots modification of measurement test vibratory string 1 is t, and temperature changes
Variable t can be test the relatively extraneous test environment of vibratory string 1 temperature knots modification or be test vibratory string 1 relative to displacement sensing
The temperature knots modification of device other structures.
The second vibration frequency for measuring test vibratory string 1 is f "；
By formula
Calculate and move knots modification Δ l ', in formula, e is the modulus of elasticity of test vibratory string 1, and m is the quality of test vibratory string 1, and α is survey
Try the coefficient of expansion of vibratory string 1.
The basic derivation of calculation formula given below：
Length, area of section, modulus of elasticity, quality and the coefficient of expansion of string wire are respectively l, s, e, m, α.
Because the strain value ε of sample to be tested calculation formula isAnd the length l of string wire is definite value, i.e. stress ε
With the generation elongation Δ l ' direct proportionalities of external force effect string wire, analysis strain value ε error is to analyze external force effect
The error size for producing elongation Δ l ' of string wire.
When string wire both ends are strained and fixed, its vibration frequency f0Meet relational expression 1 with string wire pulling force T：
This seasonal 4ml2=k, corresponding string wire strain is shown in formula 2：
When changing warm t DEG C, caused length change amount Δ l is shown in formula 3 by string wire：
Δ l=lt α (formula 3)
Because the both ends of string wire are fixed, temperature change will cause string wire internal force to produce change, internal force variation delta T such as formulas 4
It is shown：
The fundamental vibration frequency of string wire is f ' after temperature change, following formula can be used to represent：
T- Δs T=4ml2f′2
Formula 4ml is obtained after abbreviation2f0 2- set α=4ml2f′2
I.e.
When simultaneously because external force effect string wire generation elongation Δ l ', the frequency of string wire is f ", now there is formula 6,
Formula 7 is obtained after the abbreviation of formula 6
Example：
String wire length of certain test sensor is 0.1m, quality 0.00098646kg, a diameter of 0.4mm, the bullet of string wire
Property modulus be 200Gpa, the coefficient of expansion 0.00001, string wire tensioning after original frequency be 2000Hz, initial temperature be 20 DEG C, outside
Boundary's temperature change causes string wire temperature to change, while external force acting sensor occurs stress and changed, and now string wire frequency is
2500Hz, Normal practice do not consider correction for temperature effect, and it is 0.353mm to try to achieve string wire elongation, and consider that temperature is repaiied according to formula 7
After just, calculate string wire relative elongation difference is larger under different temperatures, when ignoring temperature and influenceing, the value can be erroneously interpreted as
The true knots modification that sensor is acted on by external force.Real results contrast of calculating is shown in Table 1.
The Normal practice of table 1 and result of calculation after amendment
Claims (6)
1. a kind of correction for temperature effect method of thread-vibration type device for sensing displacement, it is characterised in that comprise the following steps：
1) the original length l and area of section s of test vibratory string are measured；
2) the test vibratory string is tensed and its both ends is fixed on thread-vibration type device for sensing displacement；
3) it is f to measure first vibration frequency for testing vibratory string by frequency measuring equipment0；
4) applying test external force to the test vibratory string makes the test vibratory string generation displacement knots modification Δ l ' described so as to change
The active length of vibratory string is tested, the temperature knots modification that the test vibratory string is measured by temperature measuring equipment is t, is surveyed by frequency
The second vibration frequency that amount measurement device goes out the test vibratory string is f "；
By formula
<mrow>
<msup>
<mi>&Delta;l</mi>
<mo>&prime;</mo>
</msup>
<mo>=</mo>
<mfrac>
<mrow>
<mn>4</mn>
<msup>
<mi>ml</mi>
<mn>3</mn>
</msup>
<msup>
<mi>f</mi>
<mrow>
<mo>&prime;</mo>
<mo>&prime;</mo>
<mn>2</mn>
</mrow>
</msup>
<mo>-</mo>
<mn>4</mn>
<msup>
<mi>ml</mi>
<mn>3</mn>
</msup>
<msup>
<msub>
<mi>f</mi>
<mn>0</mn>
</msub>
<mn>2</mn>
</msup>
</mrow>
<mrow>
<mi>e</mi>
<mi>s</mi>
</mrow>
</mfrac>
<mo>+</mo>
<mi>l</mi>
<mi>t</mi>
<mi>&alpha;</mi>
</mrow>
Calculate and move knots modification Δ l ', in formula, e is the modulus of elasticity of the test vibratory string, and m is the quality of the test vibratory string, and a is
The coefficient of expansion of the test vibratory string.
2. the correction for temperature effect method of thread-vibration type device for sensing displacement as claimed in claim 1, it is characterised in that the test
Vibratory string is test string wire.
3. the correction for temperature effect method of thread-vibration type device for sensing displacement as claimed in claim 1, it is characterised in that the step
4) the temperature knots modification t in is the temperature knots modification of the test relatively extraneous test environment of vibratory string.
4. the correction for temperature effect method of thread-vibration type device for sensing displacement as claimed in claim 1, it is characterised in that the step
4) temperature knots modifications of the temperature knots modification t for the test vibratory string relative to institute's displacement sensors in.
5. the correction for temperature effect method of thread-vibration type device for sensing displacement as claimed in claim 1, it is characterised in that:The displacement
Sensor includes test vibratory string, reaction diaphragm and base, the reaction diaphragm and is fixedly installed on the base, the test
One end of vibratory string is fixedly connected with the base, and the other end of the test vibratory string connects the reaction diaphragm, and the test is shaken
String, the reaction diaphragm and described it is respectively arranged on the base with temperature sensor.
6. the correction for temperature effect method of thread-vibration type device for sensing displacement as claimed in claim 1, it is characterised in that:The test
Vibratory string is fixedly connected with the base by threaded fastener, and the test vibratory string passes through threaded fastener with the reaction diaphragm
It is fixedly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710944516.5A CN107741209A (en) | 2017-09-30 | 2017-09-30 | The correction for temperature effect method of thread-vibration type device for sensing displacement |
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| CN201710944516.5A CN107741209A (en) | 2017-09-30 | 2017-09-30 | The correction for temperature effect method of thread-vibration type device for sensing displacement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608664A (en) * | 2019-09-30 | 2019-12-24 | 中铁第一勘察设计院集团有限公司 | Bridge type vibrating wire strain gauge based on online correction |
| CN112945426A (en) * | 2021-01-29 | 2021-06-11 | 西南石油大学 | Vibrating wire sensor and stress displacement testing method |
Citations (5)
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| CN102175125A (en) * | 2011-03-14 | 2011-09-07 | 中国建筑第八工程局有限公司 | Detection method for measuring accuracy of concrete temperature restraint strain by using vibrating string strain meter |
| CN106885509A (en) * | 2017-04-10 | 2017-06-23 | 广西交通科学研究院有限公司 | Consider the strain detection testing device of temperature influence |
| CN106969701A (en) * | 2017-04-10 | 2017-07-21 | 广西交通科学研究院有限公司 | The modification method that temperature influences in strain testing |
| CN107655617A (en) * | 2017-09-30 | 2018-02-02 | 广西交通科学研究院有限公司 | The correction for temperature effect method of vibrating wire pressure sensor |
| CN107727018A (en) * | 2017-09-30 | 2018-02-23 | 广西交通科学研究院有限公司 | The correction for temperature effect method of vibrating string type strain transducer |
-
2017
- 2017-09-30 CN CN201710944516.5A patent/CN107741209A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175125A (en) * | 2011-03-14 | 2011-09-07 | 中国建筑第八工程局有限公司 | Detection method for measuring accuracy of concrete temperature restraint strain by using vibrating string strain meter |
| CN106885509A (en) * | 2017-04-10 | 2017-06-23 | 广西交通科学研究院有限公司 | Consider the strain detection testing device of temperature influence |
| CN106969701A (en) * | 2017-04-10 | 2017-07-21 | 广西交通科学研究院有限公司 | The modification method that temperature influences in strain testing |
| CN107655617A (en) * | 2017-09-30 | 2018-02-02 | 广西交通科学研究院有限公司 | The correction for temperature effect method of vibrating wire pressure sensor |
| CN107727018A (en) * | 2017-09-30 | 2018-02-23 | 广西交通科学研究院有限公司 | The correction for temperature effect method of vibrating string type strain transducer |
Non-Patent Citations (1)
| Title |
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| 林金地等: "提高振弦传感器工程检测精度的技术研究", 《工程施工技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608664A (en) * | 2019-09-30 | 2019-12-24 | 中铁第一勘察设计院集团有限公司 | Bridge type vibrating wire strain gauge based on online correction |
| CN112945426A (en) * | 2021-01-29 | 2021-06-11 | 西南石油大学 | Vibrating wire sensor and stress displacement testing method |
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Application publication date: 20180227 |
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