CN105527047A - Magnetic flux cable force detecting device based on MEMS (Micro Electro Mechanical System) acceleration sensor correction - Google Patents
Magnetic flux cable force detecting device based on MEMS (Micro Electro Mechanical System) acceleration sensor correction Download PDFInfo
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- CN105527047A CN105527047A CN201511020998.2A CN201511020998A CN105527047A CN 105527047 A CN105527047 A CN 105527047A CN 201511020998 A CN201511020998 A CN 201511020998A CN 105527047 A CN105527047 A CN 105527047A
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- 230000004907 flux Effects 0.000 title claims abstract description 55
- 230000001133 acceleration Effects 0.000 title claims abstract description 43
- 238000012937 correction Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 230000001939 inductive effect Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000032683 aging Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract 2
- 230000006698 induction Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 230000008859 change Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- 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
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a magnetic flux cable force detecting device based on MEMS (Micro Electro Mechanical System) acceleration sensor correction. The device comprises an MEMS acceleration sensor, an excitation coil, an induction coil, an anti-alias filter, a microcontroller, a data display module and the like. After the anti-alias filter filters aliasing signal from vibration signals generated by external excitation borne by a bridge cable, an analog-digital converter converts the vibration signals into digital signals, the microcontroller performs FFT (Fast Fourier Transform) operation, and the MEMS acceleration sensor finally obtains a feature frequency value of bridge cable vibration. Aiming at the problems that field calibration is needed due to data drift caused by ageing of internal electronic components, the use cost is high and the data processing difficulty is high in the present bridge cable force detecting device based on magnetic flux detection, the aim of the invention is to provide a magnetic flux cable force detecting device with the characteristics of simple structure and convenience in manufacturing and use. The magnetic flux cable force detecting device can solve the maximum problem of time drift of the present magnetic flux cable force detecting device by arranging one MEMS acceleration sensor inside the magnetic flux sensor, reduce the monitoring cost and improve the validity and the reliability of the monitored data.
Description
Technical field
The invention belongs to civil engineering structure security detection equipment field, particularly relate to a kind of magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer.
Background technology
The Suo Li size of bridge cable directly decides the duty of the guy system bridges such as cable-stayed bridge, suspension bridge, arch bridge, and the important symbol whether zip system bridge cable structure is in normal operating condition is weighed in the change of Suo Li.Therefore, adopting method accurately to detect bridge cable force is the necessary means ensureing bridge smooth construction and safe operation.
At present, the detection of domestic bridge cable force normally adopts following several method: oil pressure gauge method, determination of pressure sensor, vibratory drilling method (frequency method) etc.But because oil pressure gauge method exists the easy off normal of pointer, during high pressure, pointer shake is large, the shortcomings such as reading personal error is large; Determination of pressure sensor method dynamic response is poor, the problems such as the life-span is short, expensive; The reliability of vibratory drilling method (frequency method) depends on can not realize the problems such as round-the-clock detection in the installation site of vibro-pickup.
But, detect for bridge cable force the new method that to have occurred with magnetic flux method be representative in recent years, and there is higher future in engineering applications.Bridge cable force magnetic flux detection side ratio juris is the magnetoelastic effect based on ferrimagnet, and namely when the external mechanical load that ferrimagnet bears changes, the magnetization (magnetic permeability) of its inside changes.In engineering practice, the magnetic permeability of the component made by test ferrimagnet changes the internal stress that namely can be used for measuring component.But, the magnetic flux that the bridge cable force pick-up unit detected based on magnetic flux at present measures is a static absolute voltage value, and this magnitude of voltage can because magnetic flux transducer Inside coil and other electronic devices and components aging As time goes on can cause data wander.This needs the bridge cable force pick-up unit to detecting based on magnetic flux to re-start on-site proving by causing in engineering practice; Meanwhile, this also will cause use cost to increase and increases the difficulty of data processing.Therefore, this bridge cable force pick-up unit detected based on magnetic flux is applied and is had some limitations in engineering.
Summary of the invention
For deficiency of the prior art, the object of this invention is to provide a kind of magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer.Because bridge steel cable by the exciting being the factor such as car, strong wind, micro-vibration can occur, what the present invention adopted is the technical solution be built into by the acceleration transducer based on MEMS (micro-electromechanical technology) in magnetic flux transducer.The mechanical characteristic showing that bridge steel cable is current is analyzed by measuring bridge steel cable vibration frequecy characteristic, and the data wander of magnetic flux transducer is revised by this characteristic, thus the data wander problem not only solving the aging of magnetic flux transducer Inside coil and other electronic devices and components and cause, also improve stability and reliability that bridge cable force measures.
Technical solution of the present invention:
Based on a magnetic flux cable force detecting device for MEMS acceleration transducer correction, comprise MEMS acceleration transducer 1, temperature sensor 2, drive coil 3, inductive coil 4, boost module 5, thyristor 6, high-voltage capacitor 7, bridge steel cable 8, integrator 9, low-pass filter 10, analog to digital converter 11, microcontroller 12, frequency overlapped-resistable filter 13, RS485 interface 14, data disaply moudle 15;
It is characterized in that: the two ends of MEMS acceleration transducer 1 are connected to frequency overlapped-resistable filter 13 two ends, and frequency overlapped-resistable filter 13 is connected with microcontroller 12 by RS485 interface 14; The two ends of inductive coil 4 are connected on the two ends of integrator 9 respectively, and low-pass filter 10 is connected between integrator 9 and analog to digital converter 11, and analog to digital converter 11 is connected between low-pass filter 10 and microcontroller 12; The two ends of drive coil 3 and high-voltage capacitor 7 are connected in parallel on boost module 5 respectively with on thyristor 6, and thyristor 6 is connected between high-voltage capacitor 7 and boost module 5, and data disaply moudle 15 is connected on microcontroller 12;
MEMS acceleration transducer 1 forms magnetic flux cable force detecting device by built-in being arranged on magnetic flux transducer skeleton of pcb board, the vibration signal that external drive suffered by bridge steel cable produces by MEMS acceleration transducer 1 is by after frequency overlapped-resistable filter 13 filtering aliasing signal, digital signal is converted to again through analog to digital converter 11, eventually pass microcontroller 12 and carry out FFT computing, finally obtain the characteristic frequency value of bridge steel cable vibration.
Wherein temperature sensor 2 is used for revising the temperature drift of magnetic flux transducer; Drive coil 3 is the pumping signals sent by cable force detecting device; Low-pass filter 11 is bandwidth according to magnetic flux transducer output signal and the fixed frequency low-pass filter that sets, for the interference outside filtered signal bandwidth and noise; Frequency overlapped-resistable filter 13 is the cable vibration frequecy characteristics exported according to MEMS acceleration transducer, and according to sampling thheorem, setting meets the cutoff frequency of Sampling Theorem, for filtering aliasing signal; Thyristor 6 is used as electronic switch, is controlled by the logical signal of microcontroller 12.
Preferably, the direction of described MEMS acceleration transducer 1 is Z axis.
Preferably, described MEMS acceleration transducer 1 and temperature sensor 2 common power supply terminal.
Preferably, described data disaply moudle 15 is touch-screen, can show the data correction value of current cable force value, temperature drift value, characteristic frequency value and magnetic flux transducer.
Preferably, described inductive coil 4 is directly inserted in drive coil 3, in engineering detecting, bridge steel cable 8 is directly fixed on inductive coil 4, the induced voltage sensed is drawn by integrator 9 computing and the magnetic permeability change that bridge steel cable causes because of stressed finally obtains the changing value of integral voltage by inductive coil 4.
Preferably, described microcontroller 12 can select 51 series monolithics, also can select ARM Series Controller, its mainly to time-domain signal carry out FFT computing obtain bridge steel cable characteristic frequency value, characteristic frequency is carried out to the rope force value measured by MEMS acceleration transducer calculate the data correction value of magnetic flux transducer and transfer data to data disaply moudle 15.
Relational expression between characteristic frequency value and bridge steel cable is:
T＝4ml2fr2/r
(wherein m is unit length Suo Chong, l is that rope is long, and fr is r rank model frequency)
By analyzing fr, and the force value T that anti-release is current, just can revise the measurement force value that magnetic flux transducer is current.
High-voltage capacitor 7 is discharged by thyristor 6 pairs of drive coils 3.
Because of vibration measurement is frequency signal, and the time drift produced by component aging affects is the amplitude of signal, therefore data wander can not be there is because of the time by the rope force value that MEMS acceleration transducer is measured, so this error has the meaning of bench-marking relative to the data that magnetic flux transducer is measured, can revise the measurement data of magnetic flux transducer.The described magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer, it is characterized in that: the induced voltage sensed is drawn by integrator 9 computing and the magnetic permeability change that bridge steel cable causes because of stressed finally obtains the changing value of integral voltage by inductive coil 4.
It is simple that the present invention has structure, manufacture feature easy to use, only need at the inner built-in MEMS acceleration transducer of magnetic flux transducer, just can solve the time drift problem that current magnetic flux cable force detecting device is maximum, reduce monitoring cost, and improve the validity and reliability of Monitoring Data.
Accompanying drawing explanation
Fig. 1 is magnetic flux transducer cut-away view of the present invention;
Fig. 2 is magnetic flux acquisition principle block diagram of the present invention.
In accompanying drawing, the mark of each parts is as follows: 1, MEMS acceleration transducer; 2, temperature sensor; 3, drive coil; 4, inductive coil; 5 boost modules; 6, thyristor; 7, high-voltage capacitor; 8, bridge steel cable; 9, integrator; 10, low-pass filter; 11, analog to digital converter; 12, microcontroller; 13, frequency overlapped-resistable filter; 14, RS485 interface; 15, data disaply moudle.
Embodiment
The present invention specifically can be implemented by disclosed technology, can be conducted further description by the following examples to the present invention, but scope of the present invention is not limited to following embodiment.
Embodiment is as shown in Figure 2: the present invention is in the middle of implementation process, first MEMS sensor to be fixed on pcb board and to be built-inly arranged on magnetic flux transducer skeleton, because the vibrating shaft direction of MEMS acceleration transducer will keep vertical with the direction of vibration of bridge steel cable, so general selection Z axis is the direction of MEMS acceleration transducer.In addition, only need power due to MEMS acceleration transducer just can direct voltage output signal, so the power supply of MEMS sensor can power to reduce power supply terminal together with temperature sensor.
When cable force detecting device install as shown in Figure 2 make after just can carry out Suo Li detection to bridge steel cable.In engineering practice, only the output cable of MEMS acceleration transducer need be drawn.When after pick-up unit and the installation of bridge steel cable, just can start Suo Li and detect.First, magnetic flux cable force detecting device utilizes thyristor 6 to charge until setting voltage value by boost module 5 for high-voltage capacitor 7; Then, after magnetic flux cable force detecting device microcontroller 12 receives acquisition, high-voltage capacitor 7 is discharged by the thyristor 6 pairs of drive coils 3 be connected with drive coil 3, and inductive coil 4 senses the induced voltage caused because of magnetic flux change simultaneously; Finally, by the integrating circuit of magnetic flux cable force detecting device inside and filter filtering and the conditioning induced voltage changing value that draws the magnetic permeability change that bridge steel cable is corresponding under different stressing conditions and cause.
When needing the data revising the measurement of magnetic flux cable force detecting device magnetic flux transducer, first, need to utilize MEMS acceleration transducer to sample, the data of sampling are by obtaining the time domain data of one group of equal interval sampling after frequency overlapped-resistable filter 13 and analog to digital converter 11 process; And by microcontroller 12, the characteristic frequency value that FFT computing obtains current bridge steel cable vibration is carried out to it then; Finally, the inductive voltage value of magnetic flux transducer is revised by the rope force value corresponding to current signature frequency values.Such as, the bridge steel cable tension value that measurement obtains after magnetic flux cable force detecting device is installed for the first time is T0, the characteristic frequency that now MEMS acceleration transducer records is 5Hz, can show that the pulling force of current bridge steel cable is T by T=4ml2fr2/r formulae discovery, the initial value of these two data as pick-up unit is stored, at the beginning of general installation (T0=T).
But, suppose that magnetic flux cable force detecting device is after the use of some months, the current value of thrust of bridge wirerope cable measured by magnetic flux cable force detecting device is T1, and through the value of thrust that MEMS acceleration transducer measures be Tn, now, just by Tn-T=A, T1-(T0+A)=C, C is the modified value of magnetic flux transducer, thus can to each measured value deduct C can obtain suffered by current bridge steel cable definitely by value of thrust, finally reach the technique effect that Suo Li revises.
The above only have expressed the preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion, improvement and substitute, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1., based on a magnetic flux cable force detecting device for MEMS acceleration transducer correction, comprise MEMS acceleration transducer (1), temperature sensor (2), drive coil (3), inductive coil (4), boost module (5), thyristor (6), high-voltage capacitor (7), bridge steel cable (8), integrator (9), low-pass filter (10), analog to digital converter (11), microcontroller (12), frequency overlapped-resistable filter (13), RS485 interface (14), data disaply moudle (15); It is characterized in that: the two ends of MEMS acceleration transducer (1) are connected on frequency overlapped-resistable filter (13), and frequency overlapped-resistable filter (13) is connected with microcontroller (12) by RS485 interface; Inductive coil (4) is directly inserted in drive coil (3), its two ends are connected on integrator (9) respectively, integrator connects low-pass filter (10), analog to digital converter (11) and microcontroller (12) successively, and when bridge cable force detects, bridge steel cable (8) is fixedly connected with inductive coil (4); Described MEMS acceleration transducer (1) is built on magnetic flux transducer skeleton by pcb board, and by vibration signal that external drive suffered by bridge steel cable produces, successively through frequency overlapped-resistable filter, analog to digital converter and microcontroller, obtain the characteristic frequency value of bridge steel cable vibration.
2. the magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer according to claim 1, it is characterized in that: the described vibrating shaft direction of MEMS acceleration transducer (1) keeps vertical with the direction of vibration of bridge steel cable, the vibrating shaft direction of MEMS acceleration transducer (1) is Z axis.
3. the magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer according to claim 1 and 2, is characterized in that: described MEMS acceleration transducer (1) and temperature sensor (2) common power supply terminal.
4. the magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer according to claim 1, is characterized in that: microcontroller (12) is 51 series monolithics or ARM Series Controller.
5. the magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer according to claim 1, it is characterized in that: microcontroller (12) carries out to time-domain signal the characteristic frequency value that FFT computing obtains bridge steel cable, the data correction value that characteristic frequency calculates magnetic flux transducer is carried out to the rope force value measured by MEMS acceleration transducer, and transfers data to data disaply moudle (15).
6. according to claim 1 or 5 based on the magnetic flux cable force detecting device of MEMS acceleration transducer correction, it is characterized in that: data disaply moudle (15) is touch-screen, and be connected with microcontroller (12).
7. the magnetic flux cable force detecting device based on the correction of MEMS acceleration transducer according to claim 1, it is characterized in that: the two ends of described drive coil (3) and high-voltage capacitor (7) are connected in parallel on boost module (5) respectively with on thyristor (6), thyristor (6) is connected between high-voltage capacitor (7) and boost module (5), and high-voltage capacitor (7) is discharged to drive coil (3) by thyristor (6).
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| CN201511020998.2A CN105527047B (en) | 2015-12-30 | 2015-12-30 | One kind being based on the modified magnetic flux cable force detecting device of MEMS acceleration transducer |
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| CN201511020998.2A CN105527047B (en) | 2015-12-30 | 2015-12-30 | One kind being based on the modified magnetic flux cable force detecting device of MEMS acceleration transducer |
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| CN105527047B CN105527047B (en) | 2019-03-19 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644229A (en) * | 2017-01-20 | 2017-05-10 | 华中科技大学 | In-service cable force detecting device and method |
| CN107063545A (en) * | 2016-12-20 | 2017-08-18 | 江西飞尚科技有限公司 | A kind of Suo Li dynamic testers and its algorithm based on amendment fft algorithm |
| CN109024279A (en) * | 2018-09-30 | 2018-12-18 | 柳州欧维姆机械股份有限公司 | A kind of built-in acceleration sensor drag-line |
| CN109406631A (en) * | 2018-11-28 | 2019-03-01 | 交通运输部公路科学研究所 | A kind of parallel steel wire draws hoist cable detection device and method |
| CN109596257A (en) * | 2018-11-15 | 2019-04-09 | 交通运输部公路科学研究所 | A kind of lossless in-situ measurement device of power and method |
| CN111928890A (en) * | 2020-07-14 | 2020-11-13 | 宁波大学 | Method for measuring self-vibration frequency and cable force of inhaul cable in real time |
| CN113295317A (en) * | 2021-05-20 | 2021-08-24 | 吉林大学 | Bridge construction cable force testing method and device based on bionic principle |
| CN114878053A (en) * | 2022-06-02 | 2022-08-09 | 辽宁省交通高等专科学校 | Novel high accuracy cable force device of piezoelectric type |
| CN115452204A (en) * | 2022-08-30 | 2022-12-09 | 华能广西清洁能源有限公司 | Force sensing measurement method based on inverse magnetostriction effect |
| CN116026512A (en) * | 2023-03-30 | 2023-04-28 | 江西飞尚科技有限公司 | Soxhlet calculation temperature fitting method, system, computer and readable storage medium |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107063545B (en) * | 2016-12-20 | 2024-02-27 | 江西飞尚科技有限公司 | Cable force motion detector based on correction FFT algorithm and algorithm thereof |
| CN107063545A (en) * | 2016-12-20 | 2017-08-18 | 江西飞尚科技有限公司 | A kind of Suo Li dynamic testers and its algorithm based on amendment fft algorithm |
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| CN106644229A (en) * | 2017-01-20 | 2017-05-10 | 华中科技大学 | In-service cable force detecting device and method |
| CN109024279A (en) * | 2018-09-30 | 2018-12-18 | 柳州欧维姆机械股份有限公司 | A kind of built-in acceleration sensor drag-line |
| CN109596257A (en) * | 2018-11-15 | 2019-04-09 | 交通运输部公路科学研究所 | A kind of lossless in-situ measurement device of power and method |
| CN109596257B (en) * | 2018-11-15 | 2024-03-08 | 交通运输部公路科学研究所 | Force nondestructive in-situ measurement device and method |
| CN109406631A (en) * | 2018-11-28 | 2019-03-01 | 交通运输部公路科学研究所 | A kind of parallel steel wire draws hoist cable detection device and method |
| CN109406631B (en) * | 2018-11-28 | 2024-05-24 | 交通运输部公路科学研究所 | Parallel steel wire pulling sling detection device and method |
| CN111928890A (en) * | 2020-07-14 | 2020-11-13 | 宁波大学 | Method for measuring self-vibration frequency and cable force of inhaul cable in real time |
| CN113295317A (en) * | 2021-05-20 | 2021-08-24 | 吉林大学 | Bridge construction cable force testing method and device based on bionic principle |
| CN114878053B (en) * | 2022-06-02 | 2024-04-19 | 辽宁省交通高等专科学校 | Novel high-precision cable force device of piezoelectric type |
| CN114878053A (en) * | 2022-06-02 | 2022-08-09 | 辽宁省交通高等专科学校 | Novel high accuracy cable force device of piezoelectric type |
| CN115452204A (en) * | 2022-08-30 | 2022-12-09 | 华能广西清洁能源有限公司 | Force sensing measurement method based on inverse magnetostriction effect |
| CN116026512B (en) * | 2023-03-30 | 2023-07-04 | 江西飞尚科技有限公司 | Soxhlet calculation temperature fitting method, system, computer and readable storage medium |
| CN116026512A (en) * | 2023-03-30 | 2023-04-28 | 江西飞尚科技有限公司 | Soxhlet calculation temperature fitting method, system, computer and readable storage medium |
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