CN110608664B - Bridge type vibrating wire strain gauge based on online correction - Google Patents
Bridge type vibrating wire strain gauge based on online correction Download PDFInfo
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- CN110608664B CN110608664B CN201910938501.7A CN201910938501A CN110608664B CN 110608664 B CN110608664 B CN 110608664B CN 201910938501 A CN201910938501 A CN 201910938501A CN 110608664 B CN110608664 B CN 110608664B
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/24—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in magnetic properties
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Abstract
The invention discloses a bridge type vibrating wire strain gauge based on-line correction, wherein a first vibrating wire is fixed between a first fixed end and a second fixed end, a second vibrating wire is fixed between a second fixed end and a third fixed end, a third vibrating wire is fixed between a fourth fixed end and a fifth fixed end, a fourth vibrating wire is fixed between the fifth fixed end and the sixth fixed end, a first exciting electromagnetic coil capable of inducing excitation is arranged on the first vibrating wire, a second exciting electromagnetic coil capable of inducing excitation is arranged on the second vibrating wire, a third exciting electromagnetic coil capable of inducing excitation is arranged on the third vibrating wire, a fourth exciting electromagnetic coil capable of inducing excitation is arranged on the fourth vibrating wire, a detecting instrument is connected with the first exciting electromagnetic coil, the second exciting electromagnetic coil, the third exciting electromagnetic coil and the fourth electromagnetic coil in series, the first exciting electromagnetic coil and the third exciting electromagnetic coil are connected with the fourth electromagnetic coil in series, and the two parts of series structures form a parallel structure, and the four parts of exciting electromagnetic coils are in symmetrical relation, so that the sensitivity, the precision, the anti-interference capability and the effectiveness of measured data of the strain gauge can be effectively improved.
Description
Technical Field
The invention relates to a bridge type vibrating wire strain gauge, in particular to a bridge type vibrating wire strain gauge based on-line correction.
Background
The vibrating wire strain gauge is a structural strain monitoring device commonly used in engineering, and has the advantages of simple structure, reliable work, standard output signal, and convenient computer processing. However, due to the fact that the working environment of the traditional vibrating wire strain gauge is complex, in the practical application process, the sensitivity of the strain gauge and the measurement accuracy of data can be affected by interference of the external environment, meanwhile, the problems of low data sampling rate and small sampling points exist, and as time goes on, the problem that the precision of measuring vibration signal parameters is reduced due to aging of vibrating wires or poor plasticity of the vibrating wires generally exists in the vibrating wire strain gauge, and due to the influence of the factors, the accuracy and the effectiveness of the data are reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the bridge vibrating wire strain gauge based on-line correction, which has strong anti-interference capability and high sensitivity, and the accuracy, sampling rate and sampling point number of data are improved to a certain extent, so that the measured data are more accurate and effective.
In order to achieve the above purpose, the bridge vibrating wire strain gauge based on online correction comprises a first fixed end, a second fixed end, a third fixed end, a fourth fixed end, a fifth fixed end, a sixth fixed end, a first vibrating wire, a second vibrating wire, a third vibrating wire, a fourth vibrating wire and a detecting instrument;
the first vibrating wire is fixed between the first fixed end and the second fixed end, the second vibrating wire is fixed between the second fixed end and the third fixed end, the fourth fixed end, the fifth fixed end and the sixth fixed end are uniformly distributed between the middle and the two sides, the third vibrating wire is fixed between the fourth fixed end and the fifth fixed end, the fourth vibrating wire is fixed between the fifth fixed end and the sixth fixed end, a first exciting electromagnetic coil for exciting the first vibrating wire is arranged on the first vibrating wire, a second exciting electromagnetic coil for exciting the second vibrating wire is arranged on the second vibrating wire, a third exciting electromagnetic coil for exciting the third vibrating wire is arranged on the third vibrating wire, a fourth electromagnetic coil for exciting the fourth vibrating wire is arranged on the fourth vibrating wire, and the detection instrument is respectively connected with the first exciting electromagnetic coil, the second exciting electromagnetic coil, the third exciting electromagnetic coil and the fourth exciting electromagnetic coil.
The lengths, materials and elastic moduli of the first vibrating wire, the second vibrating wire, the third vibrating wire and the fourth vibrating wire are the same, so that the characteristics of the four vibrating wires and the consistency of subsequent sampling data can be ensured.
The first vibrating wire is fixedly connected with the first fixed end and the second fixed end, the second vibrating wire is fixedly connected with the second fixed end and the third fixed end, the third vibrating wire is fixedly connected with the fourth fixed end and the fifth fixed end, and the fourth vibrating wire is fixedly connected with the fifth fixed end and the sixth fixed end through threaded fasteners, and meanwhile the fixing devices are fixed on the same base.
The first excitation electromagnetic coil, the second excitation electromagnetic coil, the third excitation electromagnetic coil and the fourth excitation electromagnetic coil are connected in series-parallel connection. The method comprises the following steps: the first exciting electromagnetic coil and the second exciting electromagnetic coil are connected in series, the third exciting electromagnetic coil and the fourth exciting electromagnetic coil are connected in series, and the two parts of the series structures form a parallel structure together, so that the bridge type concept is formed. In the bridge-type structure, the four exciting electromagnetic coils jointly excite different vibrating wires, so that the number of sampling points and the sampling rate of data are improved, and meanwhile, the four exciting electromagnetic coils are in symmetrical relation, and therefore the sensitivity of the strain gauge and the accuracy of measured data are effectively improved.
The process for obtaining the real vibration frequency of the first vibrating wire comprises the following steps:
1) Measuring the length l and the cross-sectional area s of the first vibrating wire;
2) Tensioning the first vibrating wire, and measuring an initial vibration frequency f 0 of the first vibrating wire;
3) The first vibrating wire is subjected to constant external force F 1 through the first exciting electromagnetic coil, so that the first vibrating wire generates a vibration signal, after the time delta t, the vibration frequency F of the first vibrating wire is measured again, and the assumption is made that The result is K, then there is
Wherein,E is the elastic modulus of the first vibrating wire, and m is the mass of the first vibrating wire;
4) By applying different constant external forces to the first vibrating wire, different time periods delta t are separated, K values corresponding to the different external forces applied by the first vibrating wire and the different time periods delta t are calculated, and calculation results under different conditions are recorded in the same table;
5) Obtaining a corresponding K value by a table look-up mode according to the known constant external force F 1 and the interval time, and then obtaining the real vibration frequency of the first vibrating wire The method comprises the following steps:
6) In practical engineering application, corresponding values are searched in a table according to the values returned by the detection instrument, so that the range of the values is judged according to the returned values, and the returned measurement data is corrected on line in real time according to the result of the table lookup.
The invention has the following beneficial effects:
When the bridge type vibrating wire strain gauge based on the online correction is specifically operated, the detection instrument respectively excites the first vibrating wire, the second vibrating wire, the third vibrating wire and the fourth vibrating wire through the first exciting electromagnetic coil, the second exciting electromagnetic coil, the third exciting electromagnetic coil and the fourth exciting electromagnetic coil, and vibration signals of the first vibrating wire, the second vibrating wire, the third vibrating wire and the fourth vibrating wire are measured, so that the sampling frequency of the vibration signals is improved, and the influence of interference signals of external environment on measurement results is reduced.
Furthermore, the invention realizes the on-line revision of the real vibration frequency of the vibrating wire through data calculation, reduces the high cost caused by replacing the vibrating wire of the strain gauge, greatly prolongs the service life of the vibrating wire strain gauge, is convenient and quick to use, and is suitable for being widely used in the technical fields of bridge load tests, health monitoring and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a structural elevation of the present invention;
Wherein 10 is a first vibrating wire, 11 is a second vibrating wire, 12 is a third vibrating wire, 13 is a fourth vibrating wire, 20 is a first fixed end, 21 is a second fixed end, 22 is a third fixed end, 23 is a fourth fixed end, 24 is a fifth fixed end, 25 is a sixth fixed end, 30 is a first exciting electromagnetic coil, 31 is a second exciting electromagnetic coil, 32 is a third exciting electromagnetic coil, 33 is a fourth exciting electromagnetic coil, 4 is a detecting instrument, and 7 is a screw fastener.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1, the bridge vibrating wire strain gauge based on online correction according to the present invention includes a first fixed end 20, a second fixed end 21, a third fixed end 22, a fourth fixed end 23, a fifth fixed end 24, a sixth fixed end 25, a first vibrating wire 10, a second vibrating wire 11, a third vibrating wire 12, a fourth vibrating wire 13, and a detecting instrument 4; the first fixed end 20, the second fixed end 21 and the third fixed end 22 are uniformly distributed in the middle and on two sides, the first vibrating wire 10 is fixed between the first fixed end 20 and the second fixed end 21, the second vibrating wire 11 is fixed between the second fixed end 21 and the third fixed end 22, the fourth fixed end 23, the fifth fixed end 24 and the sixth fixed end 25 are uniformly distributed in the middle and on two sides, the third vibrating wire 12 is fixed between the fourth fixed end 23 and the fifth fixed end 24, the fourth vibrating wire 13 is fixed between the fifth fixed end 24 and the sixth fixed end 25, a first vibrating wire 30 used for exciting the first vibrating wire 10 is arranged on the first vibrating wire 10, a second vibrating wire 31 used for exciting the second vibrating wire 11 is arranged on the second vibrating wire 11, a third vibrating wire 32 used for exciting the third vibrating wire 12 is arranged on the third vibrating wire 12, a fourth vibrating wire 33 used for exciting the fourth vibrating wire 13 is arranged on the fourth vibrating wire 13, and the detection 4 is respectively connected with the first vibrating wire 30, the second vibrating wire 31, the third vibrating wire 33 and the fourth vibrating wire 33.
The first vibrating wire 10, the first fixed end 20, the second fixed end 21, the second vibrating wire 11, the second fixed end 21, the third fixed end 22, the third vibrating wire 12, the fourth fixed end 23, the fifth fixed end 24, the fourth vibrating wire 13, the fifth fixed end 24 and the sixth fixed end 25 are fixedly connected through threaded fasteners 7, and meanwhile, the fixing devices are fixed on the same base.
Referring to fig. 1, the first vibrating wire 10, the second vibrating wire 11, the third vibrating wire 12 and the fourth vibrating wire 13 have the same length; the first excitation electromagnetic coil 30, the second excitation electromagnetic coil 31, the third excitation electromagnetic coil 32, and the fourth excitation electromagnetic coil 33 are connected in series-parallel. The method comprises the following steps: the first exciting electromagnetic coil 30 and the second exciting electromagnetic coil 31 are connected in series, the third exciting electromagnetic coil 32 and the fourth exciting electromagnetic coil 33 are connected in series, and the two parts of the series structures form a parallel structure together, so that the bridge strain gauge is formed. In the bridge-type strain gauge, the four exciting electromagnetic coils jointly excite different vibrating wires, so that the number of sampling points and the sampling rate of data are improved, and meanwhile, the four exciting electromagnetic coils are in symmetrical relation, and therefore the sensitivity of the strain gauge and the accuracy of measured data are effectively improved.
The process of obtaining the true vibration frequency of the first vibrating wire 10 is as follows:
1) Measuring the length l and the cross-sectional area s of the first vibrating wire 10;
2) Tensioning the first vibrating wire 10 and measuring an initial vibration frequency f 0 of the first vibrating wire 10;
3) The first vibrating wire 10 is subjected to a constant external force F 1 by the first exciting electromagnetic coil 30, so that the first vibrating wire 10 generates a vibration signal, and after the time deltat passes, the vibration frequency F of the first vibrating wire 10 is measured again, assuming that The result is K, then there is
Wherein,E is the elastic modulus of the first vibrating wire 10, and m is the mass of the first vibrating wire 10;
4) Under the same condition, constant external force F 2 is applied to the first vibrating wire 10 through the first exciting electromagnetic coil 30 again, so that the first vibrating wire 10 generates a vibration signal, and K values corresponding to different time periods delta t of different external forces F 2 applied to the first vibrating wire 10 are calculated;
5) The above experimental procedure was repeated several times under the same conditions. That is, the K values corresponding to different time periods Δt between different external forces applied to the first vibrating wire 10 by the first exciting electromagnetic coil 30 are calculated, and the values obtained in different cases are listed in a table. .
6) Obtaining a corresponding K value by a table look-up mode according to the known constant external force F 1 and the interval time, and then obtaining the real vibration frequency of the first vibrating wire 10The method comprises the following steps:
7) In practical engineering application, corresponding values are searched in a table according to the values returned by the detection instrument, so that the range of the values is judged according to the returned values, and the returned measurement data is corrected on line in real time according to the result of the table lookup.
The detecting instrument 4 excites the first vibrating wire 10, the second vibrating wire 11, the third vibrating wire 12 and the fourth vibrating wire 13 with the same length through the first exciting electromagnetic coil 30, the second exciting electromagnetic coil 31, the third exciting electromagnetic coil 32 and the fourth exciting electromagnetic coil 33 respectively, and measures the vibration signals of the first vibrating wire 10, the second vibrating wire 11, the third vibrating wire 12 and the fourth vibrating wire 13 so as to improve the sampling frequency of the vibration signals and reduce the influence of the interference signals of the external environment on the measurement result; the detecting instrument 4 compares and carries out correlation processing on vibration signals of the first vibrating wire 10, the second vibrating wire 11, the third vibrating wire 12 and the fourth vibrating wire 13, wherein parameters of the vibration signals comprise frequency, amplitude and attenuation parameters, and the correlation processing refers to addition, subtraction, multiplication and division of data and calculation according to a stress correlation function obtained through experiments so as to improve the sampling frequency of the vibration signals and reduce the influence of external environment interference signals on a measuring result.
The above embodiment is only used for further illustrating an on-line correction-based bridge vibrating wire strain gauge, but the invention is not limited to the embodiment, and any simple modification, equivalent variation and modification to the above embodiment according to the technical substance of the invention falls within the protection scope of the technical proposal of the invention.
Claims (5)
1. The bridge type vibrating wire strain gauge based on online correction is characterized by comprising a first fixed end (20), a second fixed end (21), a third fixed end (22), a fourth fixed end (23), a fifth fixed end (24), a sixth fixed end (25), a first vibrating wire (10), a second vibrating wire (11), a third vibrating wire (12), a fourth vibrating wire (13) and a detecting instrument (4);
The second fixed end (21), the first fixed end (20) and the third fixed end (22) are uniformly distributed between the middle and two sides, the first vibrating wire (10) is fixed between the first fixed end (20) and the second fixed end (21), the second vibrating wire (11) is fixed between the second fixed end (21) and the third fixed end (22), the fifth fixed end (24), the fourth fixed end (23) and the sixth fixed end (25) are uniformly distributed between the middle and two sides, the third vibrating wire (12) is fixed between the fourth fixed end (23) and the fifth fixed end (24), the fourth vibrating wire (13) is fixed between the fifth fixed end (24) and the sixth fixed end (25), and the first vibrating wire (10) is provided with a first exciting electromagnetic coil (30) for exciting the first vibrating wire (10), the second vibrating wire (11) is provided with a second exciting electromagnetic coil (31) for exciting the second vibrating wire (11), the third vibrating wire (12) is provided with a third exciting coil (32) for exciting the third vibrating wire (12), the fourth vibrating wire (13) is fixed between the fifth fixed end (24) and the sixth fixed end (25), and the first vibrating wire (10) is provided with a fourth exciting electromagnetic coil (33) for exciting the fourth vibrating wire (13), and the fourth vibrating wire (13) is respectively exciting the fourth vibrating wire (13) The third excitation electromagnetic coil (32) and the fourth excitation electromagnetic coil (33) are connected;
the process for obtaining the real vibration frequency of the first vibrating wire (10) comprises the following steps:
1) Measuring the length l and the cross-sectional area s of the first vibrating wire (10);
2) Tensioning the first vibrating wire (10) and measuring an initial vibration frequency f 0 of the first vibrating wire (10);
3) The first vibrating wire (10) is applied with a constant external force F 1 through the first exciting electromagnetic coil (30) to enable the first vibrating wire (10) to generate a vibration signal, after the time delta t is passed, the vibration frequency F of the first vibrating wire (10) is measured again, and the assumption is made that The result of (2) is K, then:
Wherein, E is the elastic modulus of the first vibrating wire (10) and m is the mass of the first vibrating wire (10) for the change of the length of the first vibrating wire (10);
4) Repeating the experimental operation for a plurality of times, applying different constant external forces to the first vibrating wire (10) for different time delta t, calculating K values corresponding to the different external forces applied by the first vibrating wire (10) and the different time delta t, and listing the K values obtained under different conditions in the same table;
5) Obtaining a corresponding K value by a table look-up mode according to the known constant external force F 1 and the interval time, and then obtaining the real vibration frequency of the first vibrating wire (10) The method comprises the following steps:
6) And searching the corresponding numerical value in the table according to the numerical value returned by the detecting instrument (4), judging the range of the corresponding numerical value according to the returned numerical value, and carrying out real-time online correction on the returned measurement data according to the result of the table lookup.
2. The bridge vibrating wire strain gauge based on-line correction according to claim 1, wherein the lengths, materials and elastic moduli of the first vibrating wire (10), the second vibrating wire (11), the third vibrating wire (12) and the fourth vibrating wire (13) are the same, so that the characteristics of the four vibrating wires and the consistency of subsequent sampling data can be ensured.
3. Bridge vibrating wire strain gauge based on online correction according to claim 1, characterized in that the first vibrating wire (10) is fixedly connected with the first fixed end (20) and the second fixed end (21), the second vibrating wire (11) is fixedly connected with the second fixed end (21) and the third fixed end (22), the third vibrating wire (12) is fixedly connected with the fourth fixed end (23) and the fifth fixed end (24), and the fourth vibrating wire (13) is fixedly connected with the fifth fixed end (24) and the sixth fixed end (25) through threaded fasteners (7).
4. The bridge vibrating wire strain gauge based on-line correction according to claim 1, wherein the first exciting electromagnetic coil (30), the second exciting electromagnetic coil (31), the third exciting electromagnetic coil (32) and the fourth exciting electromagnetic coil (33) are connected in series-parallel.
5. The bridge vibrating wire strain gauge based on-line correction of claim 4, wherein the series-parallel connection is as follows: the first exciting electromagnetic coil (30) and the second exciting electromagnetic coil (31) are connected in series, the third exciting electromagnetic coil (32) and the fourth exciting electromagnetic coil (33) are connected in series, and the two parts of series structures form a parallel structure together.
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| US5585555A (en) * | 1995-01-24 | 1996-12-17 | Geokon, Inc. | Borehole strainmeter |
| CN106323159B (en) * | 2016-08-31 | 2018-08-03 | 爱德森（厦门）电子有限公司 | A kind of dual-vibrating-spring type strain gauge |
| CN107741209A (en) * | 2017-09-30 | 2018-02-27 | 广西大学 | Correction Method of Temperature Effect of Vibrating Wire Displacement Sensor |
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