CN107796543A - Strain-type micro gap monitoring device and fission calculation method - Google Patents
Strain-type micro gap monitoring device and fission calculation method Download PDFInfo
- Publication number
- CN107796543A CN107796543A CN201711076748.XA CN201711076748A CN107796543A CN 107796543 A CN107796543 A CN 107796543A CN 201711076748 A CN201711076748 A CN 201711076748A CN 107796543 A CN107796543 A CN 107796543A
- Authority
- CN
- China
- Prior art keywords
- strain
- cantilever beam
- pack
- monitoring device
- micro gap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012806 monitoring device Methods 0.000 title claims abstract description 61
- 230000004992 fission Effects 0.000 title claims abstract description 59
- 238000004364 calculation method Methods 0.000 title claims description 11
- 230000003750 conditioning effect Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 31
- 238000012360 testing method Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 5
- 125000003700 epoxy group Chemical group 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000004995 multiple fission Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 4
- 239000011888 foil Substances 0.000 description 19
- 230000008859 change Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Invention is related to a kind of strain-type micro gap monitoring device, including gauge length crossbeam, cantilever beam pack, strain pack and built-in integrated signal conditioning unit.Gauge length beam erection the high face such as cantilever beam pack and separates from the both ends of gauge length crossbeam in the cantilever beam pack being arranged in pairs.Strain pack is fixedly connected with the bottom of cantilever beam pack, and strains electric bridge pattern of the pack according to the different fission width permissible value configuration strain pack estimated.Built-in integrated signal conditioning unit is embedded among gauge length crossbeam, is electrically connected with strain pack.The present invention can be on the premise of ensureing that binding structure to be measured is intact, the state of development of fission that is quick, accurate, detecting civil engineering structure exhaustive, avoids large scale structure from the generation of disaster accident such as being broken or collapse.
Description
Technical field
Civil construction project technical field of the present invention, specifically, the present invention relates to a kind of monitoring of strain-type micro gap
Device and fission calculation method.
Background technology
In civil construction project, fission is the concentrated reflection that inside configuration damage reaches degree of danger, and whetheing there is fission is
The primary factor of safety, the generation and extension of fission directly destroy the integrality of structure, cause the drastically change of inside configuration stress
Change, cause the fracture of structure or collapse.Therefore, it is that civil engineering structure health Evaluation has efficacious prescriptions to the detection of fission
Method, detect that the state of development of fission is particularly important how rapidly, accurately, exhaustive, large scale structure can be avoided to be broken or collapse
The generation for the disaster accident such as collapse.
Tradition fission detection method is directed to concrete structure mostly, is broadly divided into the method for damaging and lossless method.The method of damaging includes
The methods of raggle, punching pressure water or pressure wind and boring and coring；Lossless method includes flash spotting, ultrasonic Detection Method, impact elasticity ripple
Method, acoustic emission detection method, photography detection method, optical fiber sensing network monitoring, sensor method etc..Wherein, damaging method can make
Into the local failure of concrete structure, flash spotting, camera method, fission microscopic method are only capable of measuring fission width of having had been friends in the past in lossless method
Degree, supersonic speed method and impact elasticity ripple method are only capable of the depth of measurement fission, acoustic-emission, optical fiber sensing network, sensor detection
The measurable occurent fission of method.
The content of the invention
The present invention for defect and problem present in prior art, propose a kind of strain-type micro gap monitoring device and
Fission calculation method, it is single that the monitoring device includes gauge length crossbeam, cantilever beam pack, strain pack and the conditioning of built-in integrated signal
Member.Gauge length beam erection the high face such as cantilever beam pack and separates from gauge length crossbeam in the cantilever beam pack being arranged in pairs
Both ends.The present invention can detect unearthed quickly, accurately, exhaustive on the premise of ensureing that binding structure to be measured is intact
The state of development of the fission of Wood construction structure, large scale structure is avoided to be broken or collapse etc. the generation of disaster accident.
Technical solution of the present invention：
Embodiments of the invention are according on one side, there is provided a kind of strain-type micro gap monitoring device, its feature exist
In, including gauge length crossbeam, cantilever beam pack, strain pack and built-in integrated signal conditioning unit；The gauge length beam erection
In the cantilever beam pack being arranged in pairs, the high face such as described cantilever beam pack and the two of the gauge length crossbeam are separated from
End；
The strain pack is fixedly connected with the bottom of the cantilever beam pack, and the pack that strains is according to estimating
The electric bridge pattern of different fission width permissible value configuration strain pack；The built-in integrated signal conditioning unit is embedded in described
Among gauge length crossbeam, electrically connected with the strain pack.
Further, the electric bridge pattern of the strain pack includes：The Wheatstone bridge mould of full-bridge or half-bridge or 1/4 bridge
Formula.
It is preferred that the strain-type micro gap monitoring device also includes fixing component, for the strain-type is small
Gap monitoring device is with treating that geodesic structure is fixedly connected.
Further, the strain-type micro gap monitoring device with treat that geodesic structure is fixedly connected, including：
The gauge length crossbeam of strain-type micro gap monitoring device treats that the fission of geodesic structure may occur described in being fixedly mounted on
On the perpendicular bisector in path；Or the gauge length crossbeam of strain-type micro gap monitoring device is fixedly mounted on and described treats geodesic structure
Crucial test position；
It is described to treat that geodesic structure includes concrete structure, metal structure or the timber structure fissioned；Or described treat
Geodesic structure includes concrete structure, metal structure or the timber structure for fission of having had been friends in the past.
Further, the built-in integrated signal conditioning unit includes magnifier, filter circuit and mu balanced circuit,
The output end of the input connection strain pack of the magnifier, the output end of the magnifier is through institute
Filter circuit is stated, standard voltage signal output will be converted into after the measurement small-signal conditioning of strain pack；The voltage stabilizing electricity
The input connection power supply on road, the input of the output end connection strain pack.
Further, the fixing component is adhesively fixed agent including mounting flange, bolt and/or epoxies.
It is preferred that multiple micro gap monitoring device composition micro gap monitoring arrays, are configured according to different operating modes
Path or crucial test position may occur in multiple fissions corresponding to described treat on geodesic structure；Multiple micro gap prisons
Wired connection or wireless connection between survey device.
It is preferred that being additionally provided with the cable seal plug of connecting cable on the gauge length crossbeam, the cable seal connects
The cable at first end electrically connects with the built-in integrated signal conditioning unit, the cable of the other end and the data acquisition of periphery
Device or power supply are connected.
Embodiments of the invention additionally provide according on the other hand, a kind of resolving side of strain-type micro gap fission
Method, this method are based on above-mentioned arbitrary strain-type micro gap monitoring device, specifically comprised the following steps：
Path may be occurred or determine crucial test position by estimating fission；
The range of monitoring device is determined, and using the range as sensing unit gauge length L；
Determine the thickness h of single cantilever beam piece in cantilever beam pack, the length l of single cantilever beam piece and single cantilever
The width b of beam piece；
According to caused fission or displacement in sensing unit gauge length, the rigidity of cantilever beam piece is determined；
According to the rigidity of cantilever beam piece, the moment of flexure of cantilever beam piece is determined；
With reference to cantilever beam module of anti-bending section, the interfacial stress component on cantilever beam piece surface is determined；
Determine the surface strain of cantilever beam piece, the strain in gauge length.
Wherein,
The rigidity of the cantilever beam piece is
The moment of flexure of cantilever beam piece is
Cantilever beam module of anti-bending section w=bh2/6；
The interfacial stress component on cantilever beam piece surface is
The surface strain of cantilever beam piece
Strain stress in gauge lengthL=△ x/L.
The technology of the present invention effect：
1. the embodiments of the invention provide a kind of strain-type micro gap monitoring device, realize not damage and treat geodesic structure
On the premise of integrality, on the one hand occurent the splitting for treating geodesic structure (such as bridge, bridge pier) is quickly and accurately checked
Become, that is, the dynamic change treated under the effect of geodesic structure load is monitored.On the other hand, existing fissile phase splits for no
The position of change is more prone to dynamic change when being acted on by external force, but because the monitoring device is for long-term slowly fission and short
The fission of time low frequency is all more sensitive, therefore equally can go out the fission of existing structure by nondestructive measurement.
The strain-type micro gap monitoring device of the embodiment of the present invention can be in the model of measured position fission width permissible value
In enclosing, the electric bridge pattern and cantilever beam structure of pack are strained according to measurement demand flexible configuration, such as configures 1/4 bridge, half-bridge, complete
Bridge answers variable resistance piece.
2. the monitor and detection object of monitoring device provided in an embodiment of the present invention is not limited solely to concrete structure, may be used also
Metal structure, timber structure etc. are detected, the scope of application is more extensive.
3. the monitoring device of the embodiment of the present invention includes gauge length crossbeam, cantilever beam pack, strain pack and built-in integrated
Signal condition unit.Such a design structure is simple, easy for installation, good environmental adaptability, can be long-term in the range of round-the-clock total temperature
Reliable and stable work.
Succinct construction brings later stage good technique effect easy to maintain, therefore also brings considerable economic effect
Benefit.
4. the detection object of the monitoring device of the embodiment of the present invention is not limited solely to concrete structure, also detectable metal
Structure, timber structure etc., the scope of application is more extensive.
5. the embodiment of the present invention for different application scene, can be configured with flexible combination, i.e., operating mode detect need
Ask under background, can be configured in each monitoring device as a sensing unit, multiple sensing units and treat on geodesic structure
Multiple key positions, crack problem investigation efficiency is improved, strong technical support is provided for quick positioning question.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein：
Fig. 1 is strain-type micro gap monitoring device structure example schematic diagram of the embodiment of the present invention.
Fig. 2 is strain-type micro gap monitoring device local structure schematic diagram of the embodiment of the present invention.
Wheatstone bridge foil gauge connected mode example schematic in Fig. 3 embodiments.
Fig. 4 is signal condition unit of embodiment of the present invention internal structure and operation principle schematic diagram.
Fig. 5 is strain-type micro gap fission calculation method flow chart of the present invention.
Fig. 6 is that strain-type micro gap fission of the present invention resolves model schematic.
Description of reference numerals：
1- gauge length crossbeams, 2- cantilever beam pack, 3- mounting flanges, the foil gauges of 4- first,
Integrated signal conditioning unit built in 5-；6- cable seal plugs, 7- cables, 8- mounting holes,
The foil gauges of 9- second, the foil gauges of 10- the 3rd, the foil gauges of 11- the 4th.
Embodiment
In civil construction project, fission is the concentrated reflection that inside configuration damage reaches degree of danger, is to influence safety
Primary factor, the integrality of the generation of fission and extension directly destruction structure, cause the drastically change of inside configuration stress, make
Into structure fracture or collapse.
Inventor has found, although the method for assessing civil structure health status is currently existed, greatly both for one
The a little occurent or detection carried out that caused will fission.How rapidly, detect what is fissioned accurately, exhaustive
State of development is particularly important, and large scale structure can be avoided to be broken or collapse etc. the generation of disaster accident.
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Fig. 1 is strain-type micro gap monitoring device structure example schematic diagram of the embodiment of the present invention.As shown in figure 1, this hair
The strain-type micro gap monitoring device that bright embodiment provides, including gauge length crossbeam 1, cantilever beam pack 2, strain pack and interior
Put integrated signal conditioning unit 5.Cantilever beam pack 2 can include the cantilever beam piece of varying number according to different measurement demands.
Strain pack needs to include the different foil gauge of quantity according to detection, the example in Fig. 1 be containing four foil gauges should
Variant micro gap monitoring device.First foil gauge 4, the second foil gauge 9, the 3rd foil gauge 10 and the 4th foil gauge 11 are pasted solid
Due to the both sides corresponding positive and negative of two cantilever beam pieces, and connect into wheatstone bridge form.The example of foil gauge in Fig. 1 is four
Individual metal strain plate R1, R2, R3, R4.
Gauge length crossbeam 1 is erected in the cantilever beam pack 2 being arranged in pairs, and the high face such as cantilever beam pack 2 and separates from mark
Both ends away from crossbeam 1.Strain pack is fixedly connected with the bottom of cantilever beam pack, and strains pack according to the difference estimated
Fission width permissible value configuration strain pack electric bridge pattern；Built-in integrated signal conditioning unit 5 be embedded in gauge length crossbeam 1 it
In, electrically connected with strain pack.
The electric bridge pattern of strain pack includes：The Wheatstone bridge pattern of full-bridge or half-bridge or 1/4 bridge.The small seam of strain-type
Gap monitoring device also includes fixing component, for by strain-type micro gap monitoring device with treating that geodesic structure is fixedly connected.Here
What is be related to treats that geodesic structure includes concrete structure, metal structure or the timber structure fissioned；Or split including having had been friends in the past
Concrete structure, metal structure or the timber structure of change.The gauge length crossbeam of strain-type micro gap monitoring device, which is fixedly mounted on, to be treated
The fission of geodesic structure may occur on the perpendicular bisector in path；Or the gauge length crossbeam of strain-type micro gap monitoring device is consolidated
Dingan County is mounted in the crucial test position for treating geodesic structure.
Strain-type micro gap monitoring device is with treating that the specific method that geodesic structure is fixedly connected is illustrated：
The installation of single dimension strain-type micro gap monitoring device (also referred to as sensing unit), which can be divided into, damages installation and lossless
Two kinds of installation.Installation procedure mainly has：
1) determine that path may occur for crucial test position and fission.
2) for lossless installation, flange is fixedly mounted by the agent of epoxies special bonding, settled principle is so that gauge length horizontal stroke
Beam may occur path orthogonal with fission and strain declines between two parties or by epoxies special bonding agent fixed installation flange
Small gap monitoring device is fixedly mounted on crucial test position.
3) for damaging installation, flange is fixedly mounted through mounting hole by bolt, settled principle is so that gauge length crossbeam
Path orthogonal and placed in the middle or that flange is fixedly mounted by the agent of epoxies special bonding is small by strain-type may occur with fission
Gap monitoring device is fixedly mounted on crucial test position.Crucial test position refers to by data measuring and calculating either industry experience
The position for being necessary to be monitored and/or monitoring confirmed.
At the crucial test position more than one for treating geodesic structure (such as bridge pier, bridge), or many places be present and need to monitor
Crucial test position when, can utilize multiple micro gap monitoring devices composition micro gap monitoring array, according to different works
Path or crucial test position may occur for condition configuration multiple fissions corresponding on geodesic structure is treated.Multiple micro gap monitorings
Wired connection or wireless connection between device.
Monitoring device in Fig. 1 is after structure fixation, should and when fission or transverse strain do not occur for body structure surface to be measured
Become piece resistance and keep constant, bridge output voltage is constant.Body structure surface produces fission or produces lateral magnification in the range of gauge length
When strain makes two cantilever beam pieces while is displaced outwardly, foil gauge R2, R3 produce the increase of stretching strain resistance, and R1, R4 produce pressure should
Become resistance to reduce, bridge output voltage increase；When body structure surface shrinks in the range of gauge length, two cantilever beam pieces while inside position
Move, foil gauge R2, R3 produce compressive strain resistance and reduced, and R1, R4 produce the increase of stretching strain resistance, and bridge output voltage reduces.
In addition, when impact or vibration occurs by geodesic structure, cantilever beam piece is in one inward displacement of synchronization, another
It is displaced outwardly, makes R1, R3 stressing conditions identical with change in resistance trend, R2, R4 stressing conditions and change in resistance trend phase
Together, electric bridge output keeps constant, i.e., the sensing unit structure design can exclude to treat geodesic structure by the environment such as shock and vibration because
The interference of element, coupling measurement is carried out just for the body structure surface lateral stress in the range of gauge length.It is related in the embodiment of the present invention
The intension of gauge length is the sensitive maximum magnitude of sensing unit, it is understood that is sensing unit range.One small seam of strain-type
Gap monitoring device can be understood as a sensing unit.
In particular cases, when when impact or vibration occur for geodesic structure (being equal to by geodesic structure) herein, cantilever beam piece exists
One inward displacement of synchronization, another are displaced outwardly, and make R1, R3 stressing conditions identical with change in resistance trend, R2, R4
Stressing conditions it is identical with change in resistance trend, electric bridge output keep it is constant, i.e., the sensing unit structure design can exclude to treat
Geodesic structure is disturbed by environmental factors such as shock and vibrations, and coupling is carried out just for the body structure surface lateral stress in the range of gauge length
Close measurement.
Fig. 2 is strain-type micro gap monitoring device local structure schematic diagram of the embodiment of the present invention.Gauge length is shown in Fig. 2
The cable seal plug 6 of connecting cable 7 is additionally provided with crossbeam 1, the cable 7 of cable sealed joint one end integrates with built-in
Signal condition unit 5 electrically connects, and the cable 7 of the other end is connected with the data acquisition means or power supply of periphery.
Wheatstone bridge foil gauge connected mode example schematic in Fig. 3 embodiments.Bridge excitation voltage is in Fig. 3
Vin, bridge output voltage Vout.Fig. 3 only enumerates a kind of electric bridge connected mode.In the situation for the connected mode for having determined that electric bridge
Under, still be able to according to the factor flexible configurations such as measurand material, measured point position fission width permissible value strain sheet type and
Resistance size, strain sheet type depend on measurand material, and foil gauge resistance is optional from 100 Ω to 1000 Ω.
Fig. 4 is signal condition unit of embodiment of the present invention internal structure and operation principle schematic diagram.Strain is listed in Fig. 4
The circuit function module of the small gap that declines monitoring device, including magnifier, filter circuit and mu balanced circuit.Instrument is amplified
The output end of the input connection strain pack of circuit, the filtered circuit of output end of magnifier, will come from strain group
Standard voltage signal output is converted into after the measurement small-signal conditioning of piece.The input connection power supply of mu balanced circuit, output
The input of end connection strain pack.
The i.e. built-in integrated signal conditioning unit of signal condition unit, is responsible for providing to the Wheatstone bridge being made up of foil gauge
Excitation power supply, and the small-signal that electric bridge is exported is converted to standard voltage signal.Signal conversion is embedded according to user's request simultaneously
Module, final output interface shape are that voltage/current/232/485/CAN is optional., should for ease of outdoor mobile portable application
Variant micro gap monitoring device (also referred to as sensing unit) use+12V power supplys (working standard cell voltage) are to power supply.Outside+
It is that the Wheatstone bridge that foil gauge is formed is powered to be converted into+5V by accurate voltage-stabilizing circuit after the input of 12V power supplies, and electric bridge is defeated
Magnifier, the filter circuit that the measurement small-signal gone out passes sequentially through inside signal condition unit are converted into standard after nursing one's health
Voltage signal.
Fig. 5 is strain-type micro gap fission calculation method flow chart of the present invention.Fig. 5 shows a kind of strain-type micro gap
The calculation method of fission, this method are based on above-mentioned strain-type micro gap monitoring device, specifically comprised the following steps：
S501, path may be occurred or determine crucial test position by estimating fission.
S502, the range of monitoring device is determined, and using the range as sensing unit gauge length L.
S503, determine the thickness h of single cantilever beam piece in cantilever beam pack, the length l and list of single cantilever beam piece
The width b of individual cantilever beam piece.
S504, according to caused fission or displacement in sensing unit gauge length, determine the rigidity of cantilever beam piece.
S505, according to the rigidity of cantilever beam piece, determine the moment of flexure of cantilever beam piece.
S506, with reference to cantilever beam module of anti-bending section, determine the interfacial stress component on cantilever beam piece surface.
S507, determine the surface strain of cantilever beam piece, the strain in gauge length.
Fig. 6 is that strain-type micro gap fission of the present invention resolves model schematic.Single dimension strain-type micro gap is sensitive
Unit resolves model as shown in fig. 6, sensing unit gauge length is L, cantilever beam piece thickness h, length l, width b.
After estimating fission path may occurring or determine crucial test position, the range of monitoring device is determined, and will
The range is as sensing unit gauge length L.
Determine the thickness h of single cantilever beam piece in cantilever beam pack, the length l of single cantilever beam piece and single cantilever
The width b of beam piece.
According to caused fission or displacement in sensing unit gauge length, the rigidity of cantilever beam piece is determined.When being produced in gauge length
When raw △ x fission or displacement, two cantilever beam pieces outwards produce △ x/2 displacement respectively, then the rigidity of cantilever beam piece can table
It is shown as：The rigidity of cantilever beam piece isP is that cantilever beam piece caused internal stress, E on gauge length crossbeam are
The modulus of elasticity of cantilever beam piece.Cantilever beam module of anti-bending section w=bh2/6。
According to the rigidity of cantilever beam piece, the moment of flexure of cantilever beam piece is determined；The moment of flexure of cantilever beam piece is
With reference to cantilever beam module of anti-bending section, the interfacial stress component on cantilever beam piece surface, cantilever beam piece surface are determined
Interfacial stress component be
Determine the surface strain of cantilever beam piece, the strain in gauge length.The surface strain of cantilever beam piece
Strain stress in gauge lengthL=△ x/L.
Citing：
Sensing unit kind foil gauge maximum tension degree is more than 20000u ε, then according to calculation formula
Formula εL=△ x/L, it is now assumed that full scale displacement △ x=0.5mm to be measured and minimum resolution △ x=0.01mm technology
It is required that plan selection sensing unit key parameter is cantilever beam piece thickness h=6mm, and cantilever beam leaf length l=40mm, cantilever beam piece
Wide b=28mm, sensing unit gauge length L=120mm.
The present embodiments relate to strain-type micro gap monitoring device and fission calculation method Specifications
Example is as follows：
1) scope that strain-type micro gap monitoring device can monitor micro gap is 0.5mm-3mm, therefore is referred to as " small
Gap ".Sensitive it can fission：0.5mm-3mm can configure.
2) sensitive precision：0.01mm-0.05mm can configure；
3) linearity：Better than≤2%；
4) power supply：18V-36V is optional.
The embodiment of the present invention is realized on the premise of not damaging and treating the integrality of geodesic structure, quickly and accurately lossless inspection
The occurent fission for treating geodesic structure (such as bridge, bridge pier) is found, and same nondestructive measurement goes out the fission of existing structure.
It has received good technique effect and economic benefit.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is individual ", " described " and "the" may also comprise plural form.It is to be further understood that what is used in the specification of the present invention arranges
Diction " comprising " refer to the feature, integer, step, operation, element and/or component be present, but it is not excluded that in the presence of or addition
One or more other features, integer, step, operation, element, component and/or their groups.It should be understood that when we claim member
Part is " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or wireless coupling.It is used herein to arrange
Taking leave "and/or" includes whole or any cell and all combinations of one or more associated list items.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology), there is the general understanding identical meaning with the those of ordinary skill in art of the present invention.Should also
Understand, those terms defined in such as general dictionary, it should be understood that have with the context of prior art
The consistent meaning of meaning, and unless by specific definitions as here, idealization or the implication of overly formal otherwise will not be used
To explain.
Those skilled in the art of the present technique be appreciated that can with computer program instructions come realize these structure charts and/or
The combination of each frame and these structure charts and/or the frame in block diagram and/or flow graph in block diagram and/or flow graph.This technology is led
Field technique personnel be appreciated that these computer program instructions can be supplied to all-purpose computer, special purpose computer or other
The processor of programmable data processing method is realized, so as to pass through the processing of computer or other programmable data processing methods
Device performs the scheme specified in the frame of structure chart and/or block diagram and/or flow graph disclosed by the invention or multiple frames.
Those skilled in the art of the present technique are appreciated that in the various operations discussed in the present invention, method, flow
Step, measure, scheme can be replaced, changed, combined or deleted.Further, it is each with having been discussed in the present invention
Kind operation, method, other steps in flow, measure, scheme can also be replaced, changed, reset, decomposed, combined or deleted.
Further, it is of the prior art to have and the step in the various operations disclosed in the present invention, method, flow, measure, scheme
It can also be replaced, changed, reset, decomposed, combined or deleted.
Described above is only some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of strain-type micro gap monitoring device, it is characterised in that including gauge length crossbeam, cantilever beam pack, strain pack
And built-in integrated signal conditioning unit；The gauge length beam erection is described outstanding in the cantilever beam pack being arranged in pairs
The high faces such as arm beam pack and the both ends for separating from the gauge length crossbeam；
The strain pack is fixedly connected with the bottom of the cantilever beam pack, and the strain pack is according to the difference estimated
Fission width permissible value configuration strain pack electric bridge pattern；The built-in integrated signal conditioning unit is embedded in the gauge length
Among crossbeam, electrically connected with the strain pack.
2. strain-type micro gap monitoring device according to claim 1, it is characterised in that the electric bridge of the strain pack
Pattern includes：The Wheatstone bridge pattern of full-bridge or half-bridge or 1/4 bridge.
3. strain-type micro gap monitoring device according to claim 1, it is characterised in that the strain-type micro gap
Monitoring device also includes fixing component, for by the strain-type micro gap monitoring device with treating that geodesic structure is fixedly connected.
4. strain-type micro gap monitoring device according to claim 3, it is characterised in that the strain-type micro gap
Monitoring device with treat that geodesic structure is fixedly connected, including：
The gauge length crossbeam of strain-type micro gap monitoring device treats that path may occur for the fission of geodesic structure described in being fixedly mounted on
Perpendicular bisector on；Or the gauge length crossbeam of strain-type micro gap monitoring device is fixedly mounted on the pass for treating geodesic structure
Key test position；
It is described to treat that geodesic structure includes concrete structure, metal structure or the timber structure fissioned；Or the knot to be measured
Structure includes concrete structure, metal structure or the timber structure for fission of having had been friends in the past.
5. strain-type micro gap monitoring device according to claim 1, it is characterised in that the built-in integrated signal is adjusted
Reason unit includes magnifier, filter circuit and mu balanced circuit, and the input connection of the magnifier is described should
Become the output end of pack, the output end of the magnifier is small by the measurement from strain pack through the filter circuit
Standard voltage signal output is converted into after signal condition；The input connection power supply of the mu balanced circuit, output end connection
The input of the strain pack.
6. the strain-type micro gap monitoring device according to claim 3 or 4, it is characterised in that the fixing component bag
Mounting flange, bolt and/or epoxies is included to be adhesively fixed agent.
7. strain-type micro gap monitoring device according to claim 4, it is characterised in that multiple micro gap prisons
Device composition micro gap monitoring array is surveyed, can in multiple fissions corresponding to described treat on geodesic structure according to the configuration of different operating modes
Path or crucial test position can occur；Wired connection or wireless connection between multiple micro gap monitoring devices.
8. strain-type micro gap monitoring device according to claim 1, it is characterised in that also set on the gauge length crossbeam
The cable seal plug of connecting cable is equipped with, the cable of described cable sealed joint one end is adjusted with the built-in integrated signal
Unit electrical connection is managed, the cable of the other end is connected with the data acquisition means or power supply of periphery.
9. a kind of calculation method of strain-type micro gap fission, it is characterised in that this method is based on as appointed in claim 1-8
The strain-type micro gap monitoring device of meaning one, specifically comprises the following steps：
Path may be occurred or determine crucial test position by estimating fission；
The range of monitoring device is determined, and using the range as sensing unit gauge length L；
Determine the thickness h of single cantilever beam piece in cantilever beam pack, the length l of single cantilever beam piece and single cantilever beam piece
Width b；
According to caused fission or displacement in sensing unit gauge length, the rigidity of cantilever beam piece is determined；
According to the rigidity of cantilever beam piece, the moment of flexure of cantilever beam piece is determined；
With reference to cantilever beam module of anti-bending section, the interfacial stress component on cantilever beam piece surface is determined；
Determine the surface strain of cantilever beam piece, the strain in gauge length.
10. the calculation method of strain-type micro gap fission according to claim 9, it is characterised in that
The rigidity of the cantilever beam piece is
The moment of flexure of cantilever beam piece is
Cantilever beam module of anti-bending section w=bh2/6；
The interfacial stress component on cantilever beam piece surface is
The surface strain of cantilever beam piece
Strain stress in gauge lengthL=Δ x/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711076748.XA CN107796543A (en) | 2017-11-06 | 2017-11-06 | Strain-type micro gap monitoring device and fission calculation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711076748.XA CN107796543A (en) | 2017-11-06 | 2017-11-06 | Strain-type micro gap monitoring device and fission calculation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107796543A true CN107796543A (en) | 2018-03-13 |
Family
ID=61548954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711076748.XA Pending CN107796543A (en) | 2017-11-06 | 2017-11-06 | Strain-type micro gap monitoring device and fission calculation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107796543A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108427A (en) * | 2019-05-06 | 2019-08-09 | 黄河科技学院 | A kind of bridge loading analog test device |
| CN112964406A (en) * | 2021-04-09 | 2021-06-15 | 杭州电子科技大学 | Mechanical weak fiber tension amplifying device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266072Y (en) * | 2008-08-18 | 2009-07-01 | 山东大学 | Miniature built-in cantilever beam type displacement gage used for geomechanics model experiment |
| CN103090778A (en) * | 2012-12-20 | 2013-05-08 | 太原理工大学 | Strain type linear bidirectional large displacement sensor and detection method thereof |
| CN103453832A (en) * | 2012-09-25 | 2013-12-18 | 江苏科技大学 | Multipurpose deformation measuring device and measuring method |
| CN203414052U (en) * | 2013-08-31 | 2014-01-29 | 溧阳市超源仪器厂 | GBY type tool type strain sensor |
| CN204666090U (en) * | 2015-06-17 | 2015-09-23 | 中铁十一局集团第二工程有限公司 | A kind of comprehensive strain monitoring system being applicable to builder's jack |
| CN105241746A (en) * | 2015-09-21 | 2016-01-13 | 苏州市职业大学 | Stress application mechanism in apparatus for measuring tiny shear strain of material |
| CN106403868A (en) * | 2016-08-31 | 2017-02-15 | 广西交通科学研究院 | Crack width change dynamic monitoring method based on strain induction |
-
2017
- 2017-11-06 CN CN201711076748.XA patent/CN107796543A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201266072Y (en) * | 2008-08-18 | 2009-07-01 | 山东大学 | Miniature built-in cantilever beam type displacement gage used for geomechanics model experiment |
| CN103453832A (en) * | 2012-09-25 | 2013-12-18 | 江苏科技大学 | Multipurpose deformation measuring device and measuring method |
| CN103090778A (en) * | 2012-12-20 | 2013-05-08 | 太原理工大学 | Strain type linear bidirectional large displacement sensor and detection method thereof |
| CN203414052U (en) * | 2013-08-31 | 2014-01-29 | 溧阳市超源仪器厂 | GBY type tool type strain sensor |
| CN204666090U (en) * | 2015-06-17 | 2015-09-23 | 中铁十一局集团第二工程有限公司 | A kind of comprehensive strain monitoring system being applicable to builder's jack |
| CN105241746A (en) * | 2015-09-21 | 2016-01-13 | 苏州市职业大学 | Stress application mechanism in apparatus for measuring tiny shear strain of material |
| CN106403868A (en) * | 2016-08-31 | 2017-02-15 | 广西交通科学研究院 | Crack width change dynamic monitoring method based on strain induction |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110108427A (en) * | 2019-05-06 | 2019-08-09 | 黄河科技学院 | A kind of bridge loading analog test device |
| CN110108427B (en) * | 2019-05-06 | 2021-01-15 | 黄河科技学院 | Bridge loading simulation test device |
| CN112964406A (en) * | 2021-04-09 | 2021-06-15 | 杭州电子科技大学 | Mechanical weak fiber tension amplifying device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2013318975B2 (en) | Leakage detector, leakage detection method, and pipe network monitoring apparatus | |
| CN102937646B (en) | A kind of health monitoring systems for xoncrete structure | |
| Sikarwar et al. | Review on pressure sensors for structural health monitoring | |
| Ruzek et al. | Strain and damage monitoring in CFRP fuselage panels using fiber Bragg grating sensors. Part II: Mechanical testing and validation | |
| WO2013158933A1 (en) | Integration of digital image correlation with acoustic emissions | |
| CN101319924A (en) | Imbedded wireless stress/strain/temperature sensor test platform | |
| CN111999525A (en) | Piezoelectric acceleration sensor capable of detecting working state in real time and detection method | |
| CN105527015A (en) | Flexible structure resonant frequency visualized detection system and method | |
| Kim et al. | Real-time structural health monitoring using a novel fiber-optic accelerometer system | |
| KR20110016522A (en) | Nondestructive inspection method of insulators using frequency resonance function | |
| CN103389195A (en) | Additional-stiffness-free shock excitation rod for modal test | |
| CN107796543A (en) | Strain-type micro gap monitoring device and fission calculation method | |
| CN111750902B (en) | Multi-sensitivity piezoelectric bolt looseness monitoring device and use and identification method thereof | |
| CN102937526A (en) | Device and system for measuring fan loads and fan control system | |
| Dang et al. | Piezoelectric‐based hoop‐type interface for impedance monitoring of local strand breakage in prestressed multi‐strand anchorage | |
| Wu et al. | Crack diagnosis method for a cantilevered beam structure based on modal parameters | |
| CN103090901B (en) | Sensor on-line calibration method | |
| CN103076037A (en) | Method for calibrating sensor on line | |
| CN104569626B (en) | Electrostatic field sensor, electrostatic warning system and method based on electrostatic field sensor | |
| CN205352546U (en) | Flexible construction resonance frequency visual detection system | |
| Jang et al. | Full-scale experimental validation of high-fidelity wireless measurement on a historic truss bridge | |
| CN103322958A (en) | Length sensor and detecting method thereof | |
| CN212780878U (en) | Piezoelectric acceleration sensor capable of detecting working state in real time | |
| Kordell et al. | Fiber Optic Conjugate-Stress Sensor for Local Stiffness Changes under Quasistatic Loads | |
| CN109298311B (en) | Strain balance detection circuit degradation and fault detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180313 |
|
| RJ01 | Rejection of invention patent application after publication |