CN106680380A - System for nondestructive detection on defects of prestress steel strand through ultrasonic guided waves and detection method - Google Patents
System for nondestructive detection on defects of prestress steel strand through ultrasonic guided waves and detection method Download PDFInfo
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- CN106680380A CN106680380A CN201611136059.9A CN201611136059A CN106680380A CN 106680380 A CN106680380 A CN 106680380A CN 201611136059 A CN201611136059 A CN 201611136059A CN 106680380 A CN106680380 A CN 106680380A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/262—Linear objects
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Abstract
The invention provides a system and for nondestructive detection on defects of a prestress steel strand through ultrasonic guided waves and a detection method, and relates to the field of nondestructive detection. An analog electric signal is converted into a sound signal, longitudinal axial symmetry mode guided waves are stimulated from the prestress steel strand, and through corresponding echoes, specific positions of defects of the prestress steel strand can be detected. According to the system, a digital signal processing plate card is designed independently, and compared with a conventional digital plate card, the digital signal processing plate card is relatively low in cost and easy to maintain; due to a transmission and receiving combined detection mode, the distance between transmission and receiving of the ultrasonic guided waves in the prestress steel strand can be relatively short, so that relatively small transmission attenuation of the ultrasonic guided waves can be achieved; compared with a conventional transmission and receiving separated detection method, due to that a transmission and receiving combined detection mode is relatively short in detection distance under the same receiving signal to noise ratio, the detection efficiency is improved, and nondestructive detection can be implemented in actual engineering; the digital signal processing plate card in the system provided by the invention has relatively good programmability and flexibility in aspects of signal generation, signal processing and signal display.
Description
Technical field
The present invention relates to field of non destructive testing, especially a kind of system and method for utilization ultrasound examination defect.
Background technology
Prestress wire is formed with fixed pitch by six roots of sensation crooked steel wire around a core wire twisting, due to tool
There is the features such as efficient, economy, intensity are high, relaxation property is good, prestress wire has been widely used in skyscraper, suspension cable
In the prestress engineerings such as bridge.Due to being affected by working environment and bearing capacity change for a long time, steel strand wires easily produce stress corrosion,
The defects such as impression, catastrophic break.Once generation steel strand wires stress structure ruptures, gently then greatly shorten the prestress engineering life-span,
Bury great potential safety hazard, it is heavy then cause prestress engineering corrupted to cave in, huge danger is produced to social stability, economic development
Evil.To guarantee prestress wire safety during one's term of military service, periodic monitoring should be carried out to prestress wire, Monitoring Data is entered
Row real-time processing, to the result of data processing risk assessment is carried out, to reach the purpose of prevention.
Prestress wire is the prestress engineerings such as skyscraper, stayed-cable bridge " skeleton ", prestress wire it is strong
Service life and safety coefficient of the health degree direct influence to prestress engineering.To monitor the health degree of prestress wire,
Often using ocular estimate and foreign technology service in the current engineering of detection method.Wherein, ocular estimate checkability is relatively low, test effect
It is poor, and have significant limitation --- to almost there is no any power of test by the steel strand wires of the impurity pollutions such as greasy dirt, silt.
Secondly, offshore company's technical service presence service takes the shortcomings of expensive, blockade on new techniques is serious.Furthermore, steel strand detection system mesh
Often use bistatic detecting system, this system that the excitation end of signal and receiving terminal are respectively placed in into prestress steel twist in front engineering
The two ends of line are detected, and in Practical Project most of prestress wire second half section can be buried by concrete, only one end
It is available for clamping transducer, the method suitability has limitation.Additionally, existing close the anchor pole chief inspector's Non-Destructive Testing put based on transmitting-receiving
System is distinguished with present system：1st, what anchor pole chief inspector nondestructive detection system was measured is the length of anchor pole, and the present invention will
Detection steel strand wires defect；2nd, the generation of anchor pole chief inspector nondestructive detection system waveform with receive the AWG (Arbitrary Waveform Generator) that uses and show
Ripple device.
The content of the invention
In order to overcome the deficiencies in the prior art, for current prestress wire Non-Destructive Testing problems faced, the present invention
There is provided a kind of system of utilization supersonic guide-wave Non-Destructive Testing prestress steel twist line defect, the digital signal panel card in system
There are more preferable programmability and motility under comparing in terms of signal generation, signal processing, signal show, the present invention is also provided and related to
And using the method that detected of system of supersonic guide-wave Non-Destructive Testing prestress steel twist line defect, detection efficiency can be improved, drop
Low testing cost, widens the suitability of detecting system.
The system of the supersonic guide-wave Non-Destructive Testing prestress steel twist line defect of the present invention includes host computer, digital board, work(
Rate amplification module, transmitting-receiving conjunction put control module, guided wave transmitting-receiving original paper and gain amplification module.
Wherein digital board includes network interface chip, FPGA, DSP, ADC, DAC and SRAM hardware chip, is with FPGA
Core, FPGA is connected respectively with DSP, ADC, DAC, SRAM and network interface chip, and network interface chip receives host computer
Control signal, and control signal is passed to into FPGA, FPGA receives control instruction and starts digital-to-analog converter DAC launching simulations
To power amplifier module, tranmitting frequency is to solve to obtain prestress wire group velocity by Pochhammer dispersion equations to the signal of telecommunication
Degree dispersion curve, selects the group velocity excursion in 50KHz frequency ranges to be less than 500m/s in group velocity dispersion curve
Frequency, analog electrical signal reach after power amplifier module is by power amplification transmitting-receiving conjunction put control module, now transmitting-receiving close
Put control module and open emission mode and analog electrical signal is converted into acoustical signal and is existed by guided wave transmitting-receiving original paper by analog electrical signal
Longitudinal axisymmetry mode guided wave is motivated in prestress wire, the mode guided wave is running into prestress wire fault location or steel
During the other end of twisted wire, corresponding echo is produced, echo Jing guided waves transmitting-receiving original paper is converted into analog electrical signal and reaches by acoustical signal
Control module is put to transmitting-receiving conjunction, transmitting-receiving conjunction is put control module unlatching reception pattern and carries out this signal transmission to gain amplification module
Gain is amplified, and the analog electrical signal Jing analog/digital converters ADC collections after gain is amplified are converted into digital electric signal in SRAM
After interior caching, Jing FPGA reach DSP and carry out Hilbert-Huang transform algorithm process, result Jing FPGA, network interface chip
Reach and shown to host computer.
The detection method of the system of the supersonic guide-wave Non-Destructive Testing prestress steel twist line defect is as follows：
Step 1：Known public footpath, lay pitch parameter are substituted into Pochhammer by the public footpath and the lay pitch for determining prestress wire
Dispersion equation, solves to Pochhammer dispersion equations and obtains prestress wire group velocity dispersion curve；
Step 2：Group velocity excursion in 50KHz frequency ranges is selected in from group velocity dispersion curve and is less than 500m/
S, and the single signal frequency of longitudinal mode as detection frequency be input in host computer, host computer to digital board transmission control
Instruction generates single-frequency ultrasonic signal, and single-frequency ultrasonic signal puts control module, guided wave transmitting-receiving original by power amplifier module, transmitting-receiving conjunction
Part, encourages longitudinal axiss Guided mode, the mode guided wave running into prestress wire fault location or another in steel strand wires
End produces corresponding echo, and echo Jing guided waves transmitting-receiving original paper, transmitting-receiving conjunction are put control module, gain amplification module and reach numeral
Board carries out signal processing analysis using Hilbert-Huang transform algorithm；
Step 3：Result is reached into host computer to show, if receiving only edge echo, prestress wire is intact
Fall into；If successively receiving flaw echo and end face reflection echo, prestress wire existing defects determine flaw echo correspondence
Time, will transmitting excitation guided wave moment as zero moment, receive the guided wave signals maximum moment for the time of reception, zero moment is arrived
Time a length of echo correspondence time of the time of reception, from prestress wire group velocity dispersion curve group velocity, group velocity are obtained
Degree is multiplied by the flaw echo time, then divided by 2, you can obtain particular location of the defect in steel strand wires.
The invention has the beneficial effects as follows due to autonomous Design digital signal panel card, compared to existing digital board into
This is lower, it is easy to safeguard；Due to putting detection mode using transmitting-receiving conjunction, supersonic guide-wave receives transmission by being transmitted in steel strand wires
Apart from shorter, therefore the transmission attenuation of supersonic guide-wave is less, compared to traditional bistatic detection method, receives in identical and believes
Make an uproar than under, detecting distance is farther, improve detection efficiency；Most of prestress wire second half section can be mixed in Practical Project
In the case that solidifying soil is buried, only one end is available for clamping transducer, and the present invention can still carry out Non-Destructive Testing, and traditional detection method
Infeasible, in a word, the system and the detection method suitability are wider, existing that the anchor pole chief inspector's nondestructive detection system put is closed based on transmitting-receiving
AWG (Arbitrary Waveform Generator) and oscillograph that the generation of waveform is used with reception, and the digital signal panel card in present system
There are more preferable programmability and motility under comparing in terms of signal generation, signal processing, signal show.
Description of the drawings
Fig. 1 is prestress wire supersonic guide-wave nondestructive detection system principle schematic of the present invention.
Fig. 2 is numeral board circuit theory schematic diagram of the invention.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is further described.
As shown in figure 1, the prestress wire supersonic guide-wave nondestructive detection system of the present invention, including host computer, digiboard
Controller, guided wave transmitting-receiving original paper and gain amplification module are put in card, power amplifier module, transmitting-receiving conjunction, wherein digital board includes net
Network interface chip, FPGA, DSP, ADC, DAC and SRAM hardware chip, as shown in Fig. 2 digital board is with FPGA as core, FPGA
It is connected with DSP, ADC, DAC, SRAM and network interface chip respectively, wherein FPGA type selectings are Altera Cyclone III
EP3C25F324C7, DSP type selecting is TMS320C6713, digital circuit board be stuck in reach with NI companies digital collection boards it is identical
Sample rate, port number, data-handling capacity performance simultaneously, its overall cost has greater advantage than the latter.
The system of supersonic guide-wave Non-Destructive Testing prestress steel twist line defect of the present invention includes host computer, digital board, power
Amplification module, transmitting-receiving conjunction put control module, guided wave transmitting-receiving original paper and gain amplification module.
Wherein digital board includes network interface chip, FPGA, DSP, ADC, DAC and SRAM hardware chip, is with FPGA
Core, FPGA is connected respectively with DSP, ADC, DAC, SRAM and network interface chip, and network interface chip receives host computer
Control signal, and control signal is passed to into FPGA, FPGA receives control instruction and starts digital-to-analog converter DAC launching simulations
To power amplifier module, tranmitting frequency is to solve to obtain prestress wire group velocity by Pochhammer dispersion equations to the signal of telecommunication
Degree dispersion curve, selects the group velocity excursion in 50KHz frequency ranges to be less than 500m/s in group velocity dispersion curve
Frequency, analog electrical signal reach after power amplifier module is by power amplification transmitting-receiving conjunction put control module, now transmitting-receiving close
Put control module and open emission mode and analog electrical signal is converted into acoustical signal and is existed by guided wave transmitting-receiving original paper by analog electrical signal
Longitudinal axisymmetry mode guided wave is motivated in prestress wire, the mode guided wave is running into prestress wire fault location or steel
During the other end of twisted wire, corresponding echo is produced, echo Jing guided waves transmitting-receiving original paper is converted into analog electrical signal and reaches by acoustical signal
Control module is put to transmitting-receiving conjunction, transmitting-receiving conjunction is put control module unlatching reception pattern and carries out this signal transmission to gain amplification module
Gain is amplified, and the analog electrical signal Jing analog/digital converters ADC collections after gain is amplified are converted into digital electric signal in SRAM
After interior caching, Jing FPGA reach DSP and carry out Hilbert-Huang transform algorithm process, result Jing FPGA, network interface chip
Reach and shown to host computer.
Based on the system of above-mentioned supersonic guide-wave Non-Destructive Testing prestress steel twist line defect, the present invention is examined using the system
The method of survey is as follows：
Step 1：Known public footpath, lay pitch parameter are substituted into Pochhammer by the public footpath and the lay pitch for determining prestress wire
Dispersion equation, solves to Pochhammer dispersion equations and obtains prestress wire group velocity dispersion curve；
Step 2：Group velocity excursion in 50KHz frequency ranges is selected in from group velocity dispersion curve and is less than 500m/
S, and the single signal frequency of longitudinal mode as detection frequency be input in host computer, host computer to digital board transmission control
Instruction generates single-frequency ultrasonic signal, and single-frequency ultrasonic signal puts control module, guided wave transmitting-receiving original by power amplifier module, transmitting-receiving conjunction
Part, encourages longitudinal axiss Guided mode, the mode guided wave running into prestress wire fault location or another in steel strand wires
End produces corresponding echo, and echo Jing guided waves transmitting-receiving original paper, transmitting-receiving conjunction are put control module, gain amplification module and reach numeral
Board carries out signal processing analysis using Hilbert-Huang transform algorithm；
Step 3：Result is reached into host computer to show, if receiving only edge echo, prestress wire is intact
Fall into；If successively receiving flaw echo and end face reflection echo, prestress wire existing defects determine flaw echo correspondence
Time, will transmitting excitation guided wave moment as zero moment, receive the guided wave signals maximum moment for the time of reception, zero moment is arrived
Time a length of echo correspondence time of the time of reception, from prestress wire group velocity dispersion curve group velocity, group velocity are obtained
Degree is multiplied by the flaw echo time, then divided by 2, you can obtain particular location of the defect in steel strand wires.
Claims (2)
1. a kind of system of supersonic guide-wave Non-Destructive Testing prestress steel twist line defect, including host computer, digital board, power amplification
Module, transmitting-receiving conjunction put control module, guided wave transmitting-receiving original paper and gain amplification module, it is characterised in that：
Digital board includes network interface chip, FPGA, DSP, ADC, DAC and SRAM hardware chip, with FPGA as core, FPGA
It is connected with DSP, ADC, DAC, SRAM and network interface chip respectively, network interface chip receives the control signal of host computer,
And control signal is passed to into FPGA, FPGA receives control instruction and starts the digital-to-analog converter DAC launching simulation signals of telecommunication to work(
Rate amplification module, tranmitting frequency is to solve to obtain prestress wire group velocity dispersion song by Pochhammer dispersion equations
Line, selects frequency of the group velocity excursion less than 500m/s, mould in 50KHz frequency ranges in group velocity dispersion curve
The plan signal of telecommunication reaches transmitting-receiving conjunction after power amplifier module is by power amplification and puts control module, now receives and dispatches conjunction and puts control module
Open emission mode and analog electrical signal is converted into into acoustical signal in prestress steel twist by guided wave transmitting-receiving original paper by analog electrical signal
Longitudinal axisymmetry mode guided wave is motivated in line, the mode guided wave is running into the another of prestress wire fault location or steel strand wires
During end, corresponding echo is produced, echo Jing guided waves receive and dispatch original paper and are converted into analog electrical signal by acoustical signal and reach and put to transmitting-receiving conjunction
Control module, transmitting-receiving conjunction is put control module unlatching reception pattern and this signal transmission is carried out into gain amplification to gain amplification module,
Analog electrical signal after gain is amplified is converted into after digital electric signal caches in SRAM Jing analog/digital converter ADC collections,
Jing FPGA reach DSP and carry out Hilbert-Huang transform algorithm process, and result Jing FPGA, network interface chip are reached to upper
Machine shows.
2. the detection method of the system of supersonic guide-wave Non-Destructive Testing prestress steel twist line defect described in a kind of utilization claim 1,
It is characterized in that comprising the steps：
Step 1：Known public footpath, lay pitch parameter are substituted into Pochhammer frequency dispersions by the public footpath and the lay pitch for determining prestress wire
Equation, solves to Pochhammer dispersion equations and obtains prestress wire group velocity dispersion curve；
Step 2：Group velocity excursion in 50KHz frequency ranges is selected in from group velocity dispersion curve and is less than 500m/s, and
The single signal frequency of longitudinal mode is input in host computer as detection frequency, and host computer to digital board transmits control instruction
Single-frequency ultrasonic signal is generated, single-frequency ultrasonic signal puts control module, guided wave and receives and dispatches original paper by power amplifier module, transmitting-receiving conjunction,
Longitudinal axiss Guided mode, the mode guided wave is encouraged to run into prestress wire fault location or other end in steel strand wires
Place produces corresponding echo, and echo Jing guided waves transmitting-receiving original paper, transmitting-receiving conjunction are put control module, gain amplification module and reach digital board
Signal processing analysis are carried out using Hilbert-Huang transform algorithm；
Step 3：Result is reached into host computer to show, if receiving only edge echo, prestress wire zero defect；If
Successively flaw echo and end face reflection echo are received, then prestress wire existing defects, determine the flaw echo correspondence time,
Will transmitting excitation guided wave moment as zero moment, receive the guided wave signals maximum moment for the time of reception, zero moment is to reception
Time a length of echo correspondence time at moment, group velocity is obtained from prestress wire group velocity dispersion curve, group velocity is taken advantage of
With the flaw echo time, then divided by 2, you can obtain particular location of the defect in steel strand wires.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611136059.9A CN106680380A (en) | 2016-12-12 | 2016-12-12 | System for nondestructive detection on defects of prestress steel strand through ultrasonic guided waves and detection method |
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| CN201611136059.9A CN106680380A (en) | 2016-12-12 | 2016-12-12 | System for nondestructive detection on defects of prestress steel strand through ultrasonic guided waves and detection method |
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Cited By (9)
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|---|---|---|---|---|
| CN107368644A (en) * | 2017-07-14 | 2017-11-21 | 重庆交通大学 | Steel strand prestress detection method based on guided wave modal angle of forking |
| CN107894443A (en) * | 2017-09-29 | 2018-04-10 | 长安大学 | It is a kind of to be used to monitor anchoring elastic piezoelectric ceramics system and monitoring method |
| CN108692684A (en) * | 2018-05-30 | 2018-10-23 | 昆山睿力得软件技术有限公司 | A kind of system and method for automatic detection brake block thickness |
| CN108956771A (en) * | 2018-07-07 | 2018-12-07 | 南京理工大学 | Special vehicle transmission shaft damage detection system based on supersonic guide-wave |
| CN109781621A (en) * | 2017-11-10 | 2019-05-21 | 隆基绿能科技股份有限公司 | A kind of Defect detection method |
| CN109916550A (en) * | 2019-03-29 | 2019-06-21 | 重庆交通大学 | Steel twisted-line tension-force detection method based on supersonic guide-wave energy entropy-spectrum |
| CN111623965A (en) * | 2020-01-02 | 2020-09-04 | 西南交通大学 | Contact net dropper fatigue test device and method |
| CN113701682A (en) * | 2020-05-22 | 2021-11-26 | 中国石油天然气集团有限公司 | Pipeline thickness real-time monitoring device and pipeline thickness calculating method |
| CN114002327A (en) * | 2021-11-05 | 2022-02-01 | 湘潭大学 | Method for detecting integrity degree of steel strand |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107368644B (en) * | 2017-07-14 | 2019-10-25 | 重庆交通大学 | Steel strand prestress detection method based on guided wave modal angle of forking |
| CN107368644A (en) * | 2017-07-14 | 2017-11-21 | 重庆交通大学 | Steel strand prestress detection method based on guided wave modal angle of forking |
| CN107894443A (en) * | 2017-09-29 | 2018-04-10 | 长安大学 | It is a kind of to be used to monitor anchoring elastic piezoelectric ceramics system and monitoring method |
| CN107894443B (en) * | 2017-09-29 | 2024-04-12 | 长安大学 | Piezoelectric ceramic system for monitoring anchoring tightness and monitoring method |
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| CN108692684A (en) * | 2018-05-30 | 2018-10-23 | 昆山睿力得软件技术有限公司 | A kind of system and method for automatic detection brake block thickness |
| CN108956771A (en) * | 2018-07-07 | 2018-12-07 | 南京理工大学 | Special vehicle transmission shaft damage detection system based on supersonic guide-wave |
| CN109916550A (en) * | 2019-03-29 | 2019-06-21 | 重庆交通大学 | Steel twisted-line tension-force detection method based on supersonic guide-wave energy entropy-spectrum |
| CN111623965A (en) * | 2020-01-02 | 2020-09-04 | 西南交通大学 | Contact net dropper fatigue test device and method |
| CN111623965B (en) * | 2020-01-02 | 2021-01-01 | 西南交通大学 | Contact net dropper fatigue test device and method |
| CN113701682A (en) * | 2020-05-22 | 2021-11-26 | 中国石油天然气集团有限公司 | Pipeline thickness real-time monitoring device and pipeline thickness calculating method |
| CN113701682B (en) * | 2020-05-22 | 2024-05-28 | 中国石油天然气集团有限公司 | Pipeline thickness real-time monitoring device and pipeline thickness calculating method |
| CN114002327A (en) * | 2021-11-05 | 2022-02-01 | 湘潭大学 | Method for detecting integrity degree of steel strand |
| CN114002327B (en) * | 2021-11-05 | 2024-02-23 | 湘潭大学 | Method for detecting integrity degree of steel strand |
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Application publication date: 20170517 |