CN109235922A - Based on the structural strengthening and many reference amounts synchronous monitoring device from perception carbon cloth - Google Patents
Based on the structural strengthening and many reference amounts synchronous monitoring device from perception carbon cloth Download PDFInfo
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- CN109235922A CN109235922A CN201811277100.3A CN201811277100A CN109235922A CN 109235922 A CN109235922 A CN 109235922A CN 201811277100 A CN201811277100 A CN 201811277100A CN 109235922 A CN109235922 A CN 109235922A
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- optical fiber
- carbon cloth
- civil structure
- piezoelectric material
- perception
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- 239000004744 fabric Substances 0.000 title claims abstract description 62
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 230000008447 perception Effects 0.000 title claims abstract description 33
- 238000005728 strengthening Methods 0.000 title claims abstract description 11
- 238000012806 monitoring device Methods 0.000 title claims abstract description 9
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 9
- 239000013307 optical fiber Substances 0.000 claims abstract description 62
- 239000000463 material Substances 0.000 claims abstract description 43
- 238000012544 monitoring process Methods 0.000 claims abstract description 25
- 230000008859 change Effects 0.000 claims abstract description 23
- 230000006378 damage Effects 0.000 claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 15
- 238000005452 bending Methods 0.000 claims abstract description 14
- 230000004044 response Effects 0.000 claims description 12
- 239000003822 epoxy resin Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 229920000647 polyepoxide Polymers 0.000 claims description 11
- 230000003862 health status Effects 0.000 claims description 8
- 230000036541 health Effects 0.000 claims description 7
- 238000004026 adhesive bonding Methods 0.000 claims description 5
- 208000027418 Wounds and injury Diseases 0.000 claims description 4
- 208000014674 injury Diseases 0.000 claims description 4
- 230000010358 mechanical oscillation Effects 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 238000010835 comparative analysis Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 5
- 201000010099 disease Diseases 0.000 abstract description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000035882 stress Effects 0.000 description 19
- 239000000835 fiber Substances 0.000 description 17
- 238000013461 design Methods 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 206010061245 Internal injury Diseases 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000009429 distress Effects 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a kind of based on from the structural strengthening and many reference amounts synchronous monitoring device for perceiving carbon cloth, is related to civil structure Strengthening and Monitoring technology.The present apparatus is: being compounded in from the pairs of piezoelectric material sensor on perception carbon cloth and connect respectively with NI data acquisition card, NI data acquisition card is connect with assessment system, obtains the ability of monitoring ruggedized construction damage and disease；It is compounded in from the multi-core optical fiber on perception carbon cloth and is connected with multicore optical fiber coupler, multicore optical fiber coupler, photoswitch, distribution type fiber-optic Brillouin sensing system and assessment system are sequentially connected, and obtain monitoring civil structure stress variation, the ability of bending change and temperature change.The present invention is provided for a long term the service state of ruggedized construction while reinforcing civil structure, effectively improves monitoring efficiency, and it is convenient to construct, low in cost；The beam, column, panel for being widely used in concrete structure and bridge are reinforced and monitoring, the reinforcing and monitoring in tunnel, port equipment, chimney, warehouse, workshop.
Description
Technical field
The present invention relates to civil structure Strengthening and Monitoring technologies more particularly to a kind of structure based on from perception carbon cloth to add
Gu and many reference amounts synchronous monitoring device.
Background technique
Although civil structure is just required in normal conditions of use, predetermined in the design phase using strictly full in the time
Foot designs assigned functional requirement, but the civil structure in natural environment can be constantly by various during military service
The accidental loads such as the influence of uncertain factor, such as earthquake, fire and typhoon, the differential settlement and roofing of civil structure ground
Load overload etc..These the occurrence of, have seriously threatened safety, applicability and the durability of structure.In addition, many needs
Change the sum of building occupancy already close to or reach the civil structure of design life also there is an urgent need to repair to reinforce.Needle
To these situations, carbon fibre reinforcement (Carbon Fiber Reinforced Polymer, CFRP) because its high-strength light,
Corrosion resistance and durability are strong, construction is convenient, the advantages that small is influenced on structure is widely adopted in engineering reinforcement field.
At the same time, real-time monitoring is carried out to the health status of civil structure, find and assess in time its damage position,
Type and extent predict its bearing capacity and remaining life, provide the foundation of design maintenance scheme, to the fortune for improving civil structure
Efficiency is sought, is assured the safety for life and property of the people with very big meaning.Piezoelectric material electromechanical properties are excellent, it is small in size, light-weight, make
Valence is low, response is fast, high sensitivity, long service life, and piezoelectric effect can be used for the damage check of civil structure part key point；
The characteristics of multi-core optical fiber is small in size, will not influence civil structure itself can work normally under severe natural conditions, have
Biggish sensing scope measures the Brillouin shift variation of each core in multi-core optical fiber, can demodulate in large civil structure
The variation of stress, bending and temperature etc..If the characteristics of utilizing piezoelectric material and fibre optical sensor simultaneously, links work at selected spots with that in entire areas, can
In time comprehensively judge ruggedized construction part carbon cloth fall off, gap the defects of, and reinforce body interior hole, crackle
Equivalent damage type grasps the internal states such as integrally-built stress, strain, temperature and structural vibration in real time, to grasp comprehensively
The health status of civil structure.
Summary of the invention
The object of the invention is that overcoming shortcoming and defect of the existing technology, provide a kind of based on perception carbon fiber certainly
Tie up the structural strengthening and many reference amounts synchronous monitoring device of cloth.
Specifically, the present invention utilizes the piezoelectric material being integrated on carbon fibre material while realizing structural strengthening
Known with the cooperation of optical fiber by piezoelectric stress guided waves propagation performance between two opposite piezoelectric transducers of analysis position
Not Chu civil structure damage generation, while by analysis multi-core optical fiber in each core Brillouin shift variation, demodulation be unearthed
Timber structure military service mechanical environment further judges that civil structure damages concrete type.The technology accurately can be provided promptly
The comprehensive three-dimensional health and fitness information of civil structure provides safeguard for the long-term safety military service of ruggedized construction.The technology can expand carbon
The function of fiber cloth, and reduce the lengthy and jumbled process for being laid with sensor.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
One, from perception carbon cloth
Including target --- civil structure；
It is provided with the 1st, 2 piezoelectric material sensors, multi-core optical fiber and carbon cloth；
1st, 2 piezoelectric material sensors are integrated on carbon cloth by epoxy resin bonding, or are woven in carbon cloth
And be adhesively fixed by epoxy resin, multi-core optical fiber 13 is woven in carbon cloth；
Gluing knot is impregnated by epoxy resin from perception carbon cloth to be reinforced on civil structure, and makes the 1st, 2 piezoresistive materials
Material sensor is located at civil structure monitoring point two sides relative position, and multi-core optical fiber is made to be located at civil structure force sensitive side
To.
Two, based on the structural strengthening and many reference amounts synchronous monitoring device (abbreviation device) from perception carbon cloth
Including perception carbon cloth certainly, NI data acquisition card, multicore optical fiber coupler, photoswitch, distributed light Brillouin sensing
System and assessment system；
Its connection relationship is:
It is compounded in from the 1st, 2 piezoelectric material sensors on perception carbon cloth and passes through cable and NI data acquisition card company respectively
It connects, NI data acquisition card is connect with assessment system, obtains the ability of identification civil structure damage；
It is compounded in from the multi-core optical fiber on perception carbon cloth and is connected with multicore optical fiber coupler, multicore optical fiber coupler, light are opened
It closes, distribution type fiber-optic Brillouin sensing system and assessment system are sequentially connected, acquisition monitoring civil structure stress variation, bending change
Change the ability with temperature change.
Three, based on the structural strengthening of perception carbon cloth and many reference amounts synchronous monitoring method (abbreviation method) certainly
This method the following steps are included:
1. gluing knot will be impregnated by epoxy resin from perception carbon cloth to reinforce on civil structure surface, and make pairs of
Piezoelectric material sensor, which is located at, is reinforced civil structure monitoring point two sides relative position, two piezoelectric material sensor difference
Signal driver and signal receiver as monitoring device；
2. pairs of piezoelectric material sensor is passed through cable respectively is connected to NI data acquisition card, NI data acquisition card and evaluation
System is connected, and multi-core optical fiber is connected with multicore optical fiber coupler, multicore optical fiber coupler, photoswitch, distribution type fiber-optic Brillouin
Sensor-based system and assessment system are sequentially connected；
3. assessment system controls the driving voltage signal that NI data acquisition card generates certain frequency range by cable, and passes through NI signal
Capture card is output to the piezoelectric material sensor as signal driver, and mechanical oscillation occur for piezoelectric material sensor, generates pressure
Electric stress wave, and inside civil structure and surface propagate；Stress wave response signal is by the piezoelectricity of another side surface of civil structure
Material sensors receive and are converted into voltage signal, and the input terminal of NI data acquisition card, NI data acquisition card are transferred to through cable
Digital signal is converted by the voltage signal received, and is transferred to assessment system；
4. coming into operation initial stage from perception carbon cloth, stress wave response signal and its attenuation law are acquired for the first time,
It is benchmark signal that stress wave response signal measured under civil structure health status is defined in assessment system；By monitoring building
The stress wave response signal of the subsequent military service different times of structure, by assessment system by itself and the stress under civil structure health status
The comparative analysis of wave response signal come identify civil structure damage generation, assess the degree of injury of civil structure；
5. being switched using photoswitch, the Brillouin shift of each core in distribution type fiber-optic Brillouin sensing systematic survey multi-core optical fiber
Variation, the stress variation, bending change and temperature change of civil structure are demodulated by assessment system, and thus further judgement
The concrete type damaged out.
Compared with prior art, the present invention has following advantages and good effect:
1. existing carbon cloth can only realize the reinforcing to civil structure, without monitoring function；The present invention is by piezoresistive material
Material sensor and sense light fiber, which are compounded in carbon cloth, to be become from perception carbon cloth, and the function of carbon cloth has been expanded.
2. the composite material of carbon cloth and piezoelectric material sensor and multi-core optical fiber, it is only necessary to which primary construction can be real
The target now reinforced and monitored, operation is simple, and construction cost is effectively reduced.
3. can only be monitored to structural damage using piezoelectric material sensor merely, multi-core optical fiber is used merely
Structural mechanics environment can only be monitored, with the use of can more comprehensively grasp ruggedized construction service state, further be judged
The type of damage provides foundation to design maintenance program.
4. the present invention fills up, existing civil structure is reinforced and the vacancy of monitoring complex technique, the device have reinforcement performance good
It is good, ruggedized construction surface and internal injury can be monitored online for a long time, grasp bending, strain and the environment temperature of structure in real time
The advantages that.
In short, the present invention is provided for a long term the service state of ruggedized construction while reinforcing civil structure, prison is effectively improved
Efficiency is surveyed, it is convenient to construct, low in cost；The beam, column, panel for being widely used in concrete structure and bridge are reinforced and monitoring,
The reinforcing and monitoring in tunnel, port equipment, chimney, warehouse, workshop.
Detailed description of the invention
Fig. 1 is from the structural schematic diagram for perceiving carbon cloth；
Fig. 2 is the structural block diagram of the present apparatus；
Fig. 3 is the monitoring flow chart of this method.
In figure:
10-perceive carbon cloth certainly,
11-the 1 piezoelectric material sensor,
12-the 2 piezoelectric material sensor,
13-multi-core optical fibers,
14-carbon cloths,
15-civil structures；
20-NI data acquisition cards；
30-multicore optical fiber couplers；
40-photoswitches；
50-distribution type fiber-optic Brillouin sensing systems；
60-assessment systems.
Specific embodiment
It is described in detail with reference to the accompanying drawings and examples:
One, from perception carbon cloth 10
1, overall
It include target --- civil structure 15 from carbon cloth 10 is perceived such as Fig. 1；
It is provided with the 1st, 2 piezoelectric material sensors 11,12, multi-core optical fiber 13 and carbon cloth 14；
1st, 2 piezoelectric material sensors 11,12 are integrated on carbon cloth 14 by epoxy resin bonding, or are woven in carbon fiber
It is adhesively fixed in dimension cloth 14 and by epoxy resin, multi-core optical fiber 13 is woven in carbon cloth 14；
Gluing knot is impregnated by epoxy resin from perception carbon cloth 10 to be reinforced on civil structure 15, and makes the 1st, 2 pressures
Electric material sensor 11,12 is located at 15 monitoring point two sides relative position of civil structure, and multi-core optical fiber 13 is made to be located at building knot
15 force sensitive direction of structure.
2, functional component
1) the 1st, 2 piezoelectric material sensor 11,12
For piezoelectric ceramic piece, piezoelectric crystal plate or piezoelectric membrane.
2) multi-core optical fiber 13
Fibre core number at least three of the multi-core optical fiber 13, to realize the discriminating measurement of many reference amounts.
The spatial position of each fibre core is different in multi-core optical fiber 13, and the strain to the change in shape of civil structure 15 is caused to ring
Difference is answered, when the shape of civil structure 15 changes, the response of different fibre cores is different, in the cloth by measuring multiple fibre cores
Deep frequency displacement variation, demodulates available 15 bending deformation of civil structure and axial strain；Meanwhile environment temperature change can be compensated
Change；It is to be noted that any one core of multi-core optical fiber 13 used in the present invention is all sensitive to the bending of structure, and not
It is required that centainly having intermediate cored structure；The fibre core number of general multi-core optical fiber 13 is greater than 3, to realize bending, longitudinal strain, temperature
The discriminating measurement of degree, structural vibration etc..
3) carbon cloth 14
Carbon cloth 14 is a kind of cloth being woven by carbon fibre reinforcement, there is off-the-shelf.
Two, device
1, overall
Such as Fig. 2, the present apparatus includes from perception carbon cloth 10, NI data acquisition card 20, multicore optical fiber coupler 30, photoswitch
40, distributed light Brillouin sensing system 50 and assessment system 60；
Its connection relationship is:
It is compounded in from the 1st, 2 piezoelectric material sensors 11,12 on perception carbon cloth 10 and is adopted respectively by cable and NI signal
Truck 20 connects, and NI data acquisition card 20 is connect with assessment system 60, obtains the ability that identification civil structure 15 damages；
It is compounded in from the multi-core optical fiber 13 on perception carbon cloth 10 and is connected with multicore optical fiber coupler 30, multicore optical fiber coupler
30, photoswitch 40, distribution type fiber-optic Brillouin sensing system 50 and assessment system 60 are sequentially connected, and obtain monitoring civil structure 15
The ability of stress variation, bending change and temperature change.
2, functional component
1) from perception carbon cloth 10
It is aforementioned.
2) NI data acquisition card 20
NI data acquisition card 20 is a kind of data collecting card, there is off-the-shelf.
3) multicore optical fiber coupler 30
Multicore optical fiber coupler 30 is a kind of 13 corollary apparatus of multi-core optical fiber, and one end is multi-core optical fiber 13, and the other end is more
Ordinary optic fibre；Each ordinary optic fibre corresponds to a core in multi-core optical fiber 13；It, will be more by multicore optical fiber coupler 20
Core fibre 13 is connect with general fiber plant.
4) photoswitch 40
Photoswitch 40 has off-the-shelf.
5) distributed light Brillouin sensing system 50
Distribution type fiber-optic Brillouin sensing system 50 is a kind of device that can measure optical fiber each point Brillouin shift, including in cloth
Any one of deep optical time domain reflectometer, Brillouin optical time domain analysis instrument etc., the structure for seed type that however, it is not limited to this,
The instrument that he can measure optical fiber distributed type Brillouin variation can also be applied to this system；In conjunction with multicore optical fiber coupler 30 and light
Switch 40 is realized and is measured the stress and Temperature Distribution formula of each fibre core in multi-core optical fiber 13.
6) assessment system 60
Assessment system 60 selects industrial computer, computer or notebook.
The working mechanism of the present apparatus are as follows:
The driving voltage signal that NI data acquisition card 20 generates certain frequency range is controlled by assessment system 60, is transmitted to as signal
On the piezoelectric material sensor 11 of driver, mechanical oscillation occur for driving piezoelectric material sensor 11, and mechanical oscillation signal is in soil
15 inside of timber structure and surface are propagated in the form of stress wave, and stress wave signal is connect by the piezoelectric material sensor 12 as receiver
It receives and passes through direct piezoelectric effect and switch to voltage signal, be transferred to 20 input terminal of NI data acquisition card through cable, NI signal is adopted later
Truck 20 is transferred to assessment system 60 after voltage signal is switched to digital signal, analyzes and determines civil structure by assessment system 60
The generation of 15 defects and disease；Switched by photoswitch 40, distribution type fiber-optic Brillouin sensing system 50 measures multi-core optical fiber 13
In each core Brillouin shift variation, Brillouin shift corresponds to the stress and temperature change of optical fiber, when civil structure 15 is sent out
When changing, deformation occurs for multi-core optical fiber 13, and since the spatial position of each core is different, corresponding variation coefficient is different,
By measuring the Brillouin shift in multiple fibre cores, using assessment system 60 can demodulate civil structure 15 stress variation,
Bending change and temperature change, and thus further judge the concrete type of civil structure 15 defect and disease.
Three, method
1, step is 4.:
The pumping signal compared with multiple types can be chosen using the monitoring method of piezoelectric material sensor to be monitored, as impulse wave,
Frequency sweep wave etc.；
The identification feature parameter that can be used for analyzing damage is more, such as amplitude, phase of signal etc..Experiments have shown that receiving signal
Amplitude increase with the increase of the unsticking length of reinforcing bar and concrete substrate；When reinforcing bar is surrendered, the time that wave arrives at increases
Add, this parameter constant before reinforcement yielding；Distress in concrete damage can make the amplitude of signal generate decaying, and the amplitude of signal
Attenuation degree can increase with the increase of degree of injury.Wherein, the amplitude of signal is the ideal parameter as non-destructive tests,
And the amplitude of signal is one of external manifestation of signal energy, the variation of signal amplitude means the variation of signal energy；
The present embodiment characterizes the degree of injury of structure by the energy value of signal, it is assumed that connect under 15 health status of civil structure
The energy value of the collection of letters numberE h As benchmark, the signal energy value that structure is under a certain faulted condition isE i , then the moment structure
Relative health can indicate are as follows:
Wherein,x h (n)Withx i (n)It respectively indicates structural health conditions and faulted condition lower piezoelectric material sensors receives signal and exist
ThenThe discrete signal amplitude of a data sample point,mTo receive the total sampling number of signal；Value range between 0 ~ 1,
WhenH i =1, indicate that structure is in health status,H i It is smaller, then show that a possibility that damaging is bigger, damage is more serious, whenH i =
0, structure is in function total failure mode；
When the health degree value of civil structure 15H i When < 1, ruggedized construction is damaged, at this time using multi-core optical fiber 13 into one
Step judges the concrete type of damage；
2, step is 5.
Switched by photoswitch 40, distribution type fiber-optic Brillouin sensing system 50 measures the Brillouin of each core in multi-core optical fiber 13
Frequency displacement variation, the stress variation, bending change and temperature change of civil structure are demodulated by assessment system 60.Referring to Fig. 3, when
It reconciles the result shows that can judge the type of impairment that civil structure occurs further when stress, bending change to reinforce master
Body generates crack, and otherwise type of impairment is carbon cloth degumming, sliding.
3, referring to Fig. 3, the workflow of step 4. 5. is:
A, piezoelectric material sensor receives signal -301；
B, judge health degree valueH i Whether it is less than 1-302, is to enter step C, otherwise ruggedized construction health -306；
C, there is damage -303 in ruggedized construction；
D, judge whether multi-core optical fiber Brillouin shift changes -304, be to enter step E, otherwise from perception carbon cloth
10 peel off, slide -307；
E, it reinforces main body and generates inner void, crackle.
Claims (4)
1. a kind of from perception carbon cloth (10), including target --- civil structure (15)；
It is characterized by:
It is provided with the 1st, 2 piezoelectric material sensors (11,12), multi-core optical fiber (13) and carbon cloth (14)；
1st, 2 piezoelectric material sensors (11,12) are integrated on carbon cloth (14) by epoxy resin bonding, or are woven in
It is adhesively fixed in carbon cloth (14) and by epoxy resin, multi-core optical fiber (13) is woven in carbon cloth (14)；
It is reinforced on civil structure (15) from perception carbon cloth (10) by epoxy resin dipping gluing knot, and make the 1st,
2 piezoelectric material sensors (11,12) are located at civil structure (15) monitoring point two sides relative position, make multi-core optical fiber (13) position
In civil structure (15) force sensitive direction.
2. a kind of structural strengthening and many reference amounts synchronous monitoring device based on from perception carbon cloth, it is characterised in that:
Including perception carbon cloth (10) certainly, NI data acquisition card (20), multicore optical fiber coupler (30), photoswitch (40), divide
Cloth light Brillouin sensing system (50) and assessment system (60)；
Its connection relationship is:
It is compounded in from the 1st, 2 piezoelectric material sensors (11,12) in perception carbon cloth (10) and is believed respectively by cable and NI
The connection of number capture card (20), NI data acquisition card (20) connects with assessment system (60), are obtained and are identified that civil structure (15) are damaged
Ability；
It is compounded in from the multi-core optical fiber (13) in perception carbon cloth (10) and is connected with multicore optical fiber coupler (30), multi-core optical fiber
Coupler (30), photoswitch (40), distribution type fiber-optic Brillouin sensing system (50) and assessment system (60) are sequentially connected, and are obtained
Monitor civil structure (15) stress variation, the ability of bending change and temperature change.
3. a kind of structural strengthening and many reference amounts synchronous monitoring method based on from perception carbon cloth, it is characterised in that:
1. gluing knot will be impregnated by epoxy resin from perception carbon cloth (10) to reinforce on civil structure (15) surface, and
It is located at pairs of the 1st, 2 piezoelectric material sensors (11,12) and is reinforced civil structure (15) monitoring point two sides with respect to position
It sets, signal driver and signal receiver of the 1st, the 2 piezoelectric material sensors (11,12) respectively as monitoring device；
2. the pairs of the 1st, 2 piezoelectric material sensors (11,12) are connected to NI data acquisition card (20), NI by cable respectively
Data acquisition card (20) and evaluation are 60 to be connected, and multi-core optical fiber (13) is connected with multicore optical fiber coupler (30), multi-core optical fiber
Coupler (30), photoswitch (40), distribution type fiber-optic Brillouin sensing system (50) and assessment system (60) are sequentially connected；
3. assessment system (60) generates the driving voltage signal of certain frequency range by cable control NI data acquisition card (20), and leads to
It crosses NI data acquisition card (20) and is output to the 1st piezoelectric material sensor (11) as signal driver, the 1st piezoelectric material sensing
Mechanical oscillation occur for device (11), generate piezoelectric stress wave, and propagate in civil structure (15) inside and surface；Stress wave response letter
Number by civil structure (15) another side surface the 2nd piezoelectric material sensor (12) receive and be converted into voltage signal, through cable
It is transferred to the input terminal of NI data acquisition card (20), the voltage signal received is converted digital letter by NI data acquisition card (20)
Number, and it is transferred to assessment system (60)；
4. coming into operation initial stage from perception carbon cloth (10), stress wave response signal and its attenuation law are adopted for the first time
Collection is believed on the basis of defining stress wave response signal measured under civil structure (15) health status in assessment system (60)
Number；By monitor civil structure (15) subsequent military service different times stress wave response signal, by assessment system (60) by its with
Stress wave response signal comparative analysis under civil structure (15) health status identifies the generation of civil structure (15) damage, comments
Estimate the degree of injury of civil structure (15)；
5. being switched using photoswitch (40), distribution type fiber-optic Brillouin sensing system (50) measures each core in multi-core optical fiber (13)
Brillouin shift variation, the stress variation, bending change and temperature change of civil structure are demodulated by assessment system (50),
And thus further judge the concrete type of damage.
4. monitoring method according to claim 3, it is characterised in that workflow:
A, piezoelectric material sensor receives signal (301)；
B, judge health degree valueH i Whether 1(302 is less than), it is to enter step C, otherwise ruggedized construction is healthy (306)；
C, there is damage (303) in ruggedized construction；
D, judge whether multi-core optical fiber Brillouin shift changes (304), be to enter step E, otherwise from perception carbon fiber
Cloth peels off, slides (307)；
E, it reinforces main body and generates inner void, crackle (305).
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| CN201811277100.3A CN109235922A (en) | 2018-10-30 | 2018-10-30 | Based on the structural strengthening and many reference amounts synchronous monitoring device from perception carbon cloth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811277100.3A CN109235922A (en) | 2018-10-30 | 2018-10-30 | Based on the structural strengthening and many reference amounts synchronous monitoring device from perception carbon cloth |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285162A (en) * | 2020-10-18 | 2021-01-29 | 西安交通大学 | Metal-based composite material self-perception characteristic detection system and method based on continuous carbon core piezoelectric fibers |
| CN114112262A (en) * | 2021-11-18 | 2022-03-01 | 中国铁路设计集团有限公司 | Vibration chip falling test method for spraying fibers on floor below main line of rail transit elevated station |
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