CN206160944U - Centrifuge vibration displacement field comprehensive test collection system - Google Patents
Centrifuge vibration displacement field comprehensive test collection system Download PDFInfo
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- CN206160944U CN206160944U CN201621104301.XU CN201621104301U CN206160944U CN 206160944 U CN206160944 U CN 206160944U CN 201621104301 U CN201621104301 U CN 201621104301U CN 206160944 U CN206160944 U CN 206160944U
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Abstract
The utility model relates to a centrifuge vibration displacement field comprehensive test collection system. The utility model aims at providing a simple structure, economical and practical's centrifuge vibration displacement field comprehensive test collection system to obtain true and reliable tentation data. The utility model provides a: a centrifuge vibration displacement field comprehensive test collection system, has centrifugal field model case, and test model, its characterized in that have been put to this centrifugation field model incasement: centrifugation field model incasement is equipped with the camera that takes the photograph who is used for the monitoring test model surface displacement, and this centrifugation field model incasement is equipped with a plurality of fiber grating displacement sensor that are used for measuring the inside displacement of test model. The utility model is suitable for a geotechnical engineering field.
Description
Technical field
The utility model is related to a kind of centrifuge vibration displacement field integration test acquisition system.Suitable for Geotechnical Engineering
Field.
Background technology
Centrifugation physical model experiment can make the phenomenon occurred in engineering, and in the lab reproducing comes, but also can be to examination
Test middle principal element to be independently controlled.Compared with field measurement, the early stage optimization of scheme can be carried out, with saving time, labour-saving
Advantage.Ground Centrifugal vibration model test is that, with the theory of similarity as theoretical foundation, by leiomyoma cells, by a certain percentage chi makes mould
After type, in being placed in the centrifugal field generated by centrifuge, by the body force for increasing the soil body, model is set to reach equal with prototype answering
Power state, so that prototype keeps good similitude with the deformation and failure process of model, then applies dynamic by shake table
Load, and the deformation and destruction of learning prototype is come with this.
However, under powerful centrifugal force and oscillatory load effect, conventional displacement field acquisition system, it may appear that camera is drawn
The problems such as face distortion, bracing frame destruction, common displacement transducer do not collect data, leads to not capture preferable model
Breakoff phenomenon and real data are collected, have a strong impact on the reliability of test result.
The content of the invention
The technical problems to be solved in the utility model is：For above-mentioned problem, there is provided a kind of structurally simple, economical
Practical centrifuge vibration displacement field integration test acquisition system, to obtain true and reliable test data.
The technical scheme that the utility model is adopted is：A kind of centrifuge vibration displacement field integration test acquisition system, tool
There is centrifugal field model casing, the centrifugal field model casing is built-in with test model, it is characterised in that：The centrifugal field model casing built with
For the video camera of monitoring test model surface displacement, it is provided with some for measuring inside test model in the centrifugal field model casing
The fiber grating displacement sensor of displacement；
The fiber grating displacement sensor has monitoring block, finer wire and fiber grating fixed mount, wherein monitoring block is put
Inside the test model, fiber grating fixed mount of the block Jing finer wires connection outside test model, fiber grating are monitored
Fixed mount Jing mounting brackets are fixed in centrifugal field model casing；The fiber grating fixed mount includes the beam of uniform strength, fiber grating
And fixed plate, beam of uniform strength one end connection finer wire, other end Jing fixed plates fixation is due to the mounting bracket, and the grade is strong
Fiber grating, fiber grating Jing optic fibre wires connection fiber grating displacement (FBG) demodulator are fixed with degree beam.
The beam of uniform strength is vertically arranged.
The video camera has two, wherein a Jing fixed support is fixed on the centrifugal field model casing top, is used for
Monitor test model surface horizontal displacement；Another Jing vertical supports are fixed in centrifugal field model casing, for monitoring
State the vertical displacement of test model surface.
The video camera is using the industrial displacement video camera of high accuracy.
The method that acquisition system described in the utility model application is acquired, it is characterised in that：
Using the shooting machine testing test model surface displacement dynamic change situation, taken the photograph by two different monitoring moment
The comparison of picture point draws the test model surface displacement changing condition of the time period；
When test model is always deformed in Centrifugal vibration test, the monitoring block inside test model is with test model
Deformation produces displacement, and displacement is passed to fiber grating fixed mount, the light on fiber grating fixed mount by monitoring block by finer wire
Fine grating produces strain, and the wavelength in fiber grating produces change, and the wavelength change Jing optic fibre wire passes to fiber grating position
(FBG) demodulator is moved, the displacement data at the monitoring block is drawn；
Inside the test model that the test model surface displacement that video camera is measured and fiber grating displacement sensor are measured
Displacement is combined, and by carrying out difference to known point displacement data, draws displacement field data of the test model at the different vibration moment.
The displacement measurement data of the fiber grating displacement sensor are drawn by following formula calibration
In formula：Δ δ is the displacement of fiber grating；E for the beam of uniform strength elastic modelling quantity, units MPa；L, b, h be respectively etc.
The length of intensity beam, width and thickness, unit mm.(ΔλB-ΔλBT) centered on wavelength variable quantity；λB0Not receive external force, temperature
Spend for 0 DEG C when the fiber grating initial center wavelength；cεRespectively photoelastic correction factor.
The beneficial effects of the utility model are：The utility model principle is simple, using equipment routine, and practical, economic dispatch
Advantage, can effectively solving displacement field in machine vibration physical simulation experiment is centrifuged at present cannot carry out the problem of composite measurement, improve
The reliability of measurement structure, with good economic benefit and social benefit.
Description of the drawings
Fig. 1 is the sectional view of embodiment.
Fig. 2 is the top view of embodiment.
Fig. 3 is the enlarged diagram in A portions in Fig. 1.
Specific embodiment
As shown in Figure 1 and Figure 2, the present embodiment has centrifugal field model casing 1, and the centrifugal field model casing is built-in with test model
2.(high accuracy work is adopted in this example built with the video camera 3 for the surface displacement of monitoring test model 2 in centrifugal field model casing 1
Industry displacement video camera), some fiber grating displacements for measuring the internal displacement of test model 2 are provided with the centrifugal field model casing
Sensor.
Two surface displacements of 3 monitoring test model of video camera 2 are adopted in this example, wherein a video camera 3 is by fixed
Frame 11 is fixed on the top of centrifugal field model casing 1, the monitoring lower section surface horizontal displacement of test model 2；Another Jing of video camera 3 is vertical
Support is fixed in centrifugal field model casing 1, monitors the test model 2 surface vertical displacement.
Fiber grating displacement sensor has monitoring block 5, diameter 0.5mm finer wires 6 and fiber grating fixed mount in this example,
Fiber grating fixed mount includes the beam of uniform strength 7, fiber grating 9 and fixed plate 8.Wherein monitor block 5 to be placed in inside test model 2,
Fiber grating fixed mount is located at outside test model 2, and 5 Jing finer wires of monitoring block 6 connect the beam of uniform strength 7 on fiber grating fixed mount
One end, the other end of the beam of uniform strength 7 is fixed in centrifugal field model casing 1 (see Fig. 3) by fixed plate 8 and mounting bracket 4.Initially
During state, the beam of uniform strength 7 is in vertical state, and finer wire 6 is in horizontality.Fiber grating 9 is fixed on the beam of uniform strength 7,
9 Jing optic fibre wires of fiber grating 10 connect fiber grating displacement (FBG) demodulator.
The concrete grammar of displacement measurement is as follows in the present embodiment：
Using the surface displacement dynamic change situation of 3 monitoring test model of video camera 2, by two different monitoring moment shootings
The comparison of point draws the surface displacement changing condition of test model 2 of the time period；
When test model 2 is deformed in Centrifugal vibration test, the monitoring block 5 inside test model 2 is with test mould
The deformation of type 2 produces displacement, and displacement is passed to fiber grating fixed mount, fiber grating fixed mount by monitoring block 5 by finer wire 6
On fiber grating 9 produce strain, cause wavelength in fiber grating to produce change, the wavelength change Jing optic fibre wire 10 is transmitted
The displacement data at monitoring block 5 is drawn by the wavelength change to fiber grating displacement (FBG) demodulator, fiber grating displacement (FBG) demodulator.
Wherein fiber grating displacement measurement data can be drawn by following formula calibration
In formula：Δ δ is the displacement for monitoring block；E is the elastic modelling quantity (MPa) of the beam of uniform strength；L, b, h are respectively the beam of uniform strength
14 length, width and thickness (mm).(ΔλB-ΔλBT) centered on wavelength variable quantity；λB0It it is 0 DEG C not receive external force, temperature
When the grating initial center wavelength；cεRespectively photoelastic correction factor, for common quartz optical fiber grating, cεFor
0.78×10-6με-1。
The position of unlike signal point on slope surface in the same time can be measured not according to video camera 3, by two not in the same time
Picture contrasted, you can draw the displacement situation of the slopes in the time period between the two moment.By the displacement situation
If the displacement done with the slopes inside measured using fiber grating displacement sensor 5 is plotted in software Sufer, and based on upper
State known displacement and enter row interpolation to whole side slope region, and then draw the slope-mass slide displacement situation in the range of whole slopes.Repeat
Said process, you can draw the slopes global displacement field distribution characteristics in different time section.
Claims (4)
1. a kind of centrifuge vibration displacement field integration test acquisition system, with centrifugal field model casing (1), the centrifugal field model casing
It is built-in with test model (2), it is characterised in that：The centrifugal field model casing (1) is built with for monitoring test model (2) surface
The video camera (3) of displacement, is provided with some fiber gratings for measuring test model (2) internal displacement in the centrifugal field model casing
Displacement transducer；
The fiber grating displacement sensor has monitoring block (5), finer wire (6) and fiber grating fixed mount, wherein monitoring block
(5) it is placed in the test model (2) internal, monitoring block Jing finer wires (6) connection is located at test model (2) fiber grating outward
Fixed mount, fiber grating fixed mount Jing mounting brackets (4) is fixed in centrifugal field model casing (1)；The fiber grating fixed mount
Including the beam of uniform strength (7), fiber grating (9) and fixed plate (8), the beam of uniform strength (7) one end connects the finer wire (6), another
End Jing fixed plates (8) is fixed due to the mounting bracket (4), and fiber grating (9), fiber grating are fixed with the beam of uniform strength
(9) Jing optic fibre wires (10) connection fiber grating displacement (FBG) demodulator.
2. integration test acquisition system in centrifuge vibration displacement field according to claim 1, it is characterised in that：The grade is strong
Degree beam (7) is vertically arranged.
3. integration test acquisition system in centrifuge vibration displacement field according to claim 1, it is characterised in that：The shooting
Machine (3) is with two, wherein a Jing fixed support (11) is fixed on centrifugal field model casing (1) top, for monitoring
State test model (2) surface horizontal displacement；Another Jing vertical supports are fixed in centrifugal field model casing (1), for monitoring
State test model (2) surface vertical displacement.
4. the centrifuge vibration displacement field integration test acquisition system according to claim 1 or 3, it is characterised in that：It is described
Video camera (3) is using the industrial displacement video camera of high accuracy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621104301.XU CN206160944U (en) | 2016-10-09 | 2016-10-09 | Centrifuge vibration displacement field comprehensive test collection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621104301.XU CN206160944U (en) | 2016-10-09 | 2016-10-09 | Centrifuge vibration displacement field comprehensive test collection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338249A (en) * | 2016-10-09 | 2017-01-18 | 中国电建集团华东勘测设计研究院有限公司 | Centrifuge vibration displacement field integrated test acquisition system and displacement measurement method |
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2016
- 2016-10-09 CN CN201621104301.XU patent/CN206160944U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338249A (en) * | 2016-10-09 | 2017-01-18 | 中国电建集团华东勘测设计研究院有限公司 | Centrifuge vibration displacement field integrated test acquisition system and displacement measurement method |
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