CN106644226A - Frictional resistance calibrating device aiming at liquid crystal coating - Google Patents
Frictional resistance calibrating device aiming at liquid crystal coating Download PDFInfo
- Publication number
- CN106644226A CN106644226A CN201710064984.3A CN201710064984A CN106644226A CN 106644226 A CN106644226 A CN 106644226A CN 201710064984 A CN201710064984 A CN 201710064984A CN 106644226 A CN106644226 A CN 106644226A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- frictional resistance
- base
- crystal coatings
- caliberating device
- 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.)
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 42
- 238000000576 coating method Methods 0.000 title claims abstract description 37
- 239000011248 coating agent Substances 0.000 title abstract 2
- 239000011521 glass Substances 0.000 claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910000737 Duralumin Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
-
- 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
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0033—Force sensors associated with force applying means applying a pulling force
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a frictional resistance calibrating device aiming at liquid crystal coating, and relates to a model surface friction measurement field of a wind tunnel test. The frictional resistance calibrating device comprises a glass disc, an outer cover, a tray, a measuring bench, a base, a fixed pulley, and a weight. The base is a disc mechanism, and is horizontally disposed on the lowest end. The measuring bench is fixedly disposed on the upper surface of the base, and the tray is fixedly disposed on the upper surface of the base. The glass disc is fixedly disposed on the upper surface of the tray, and the outer cover is fixedly disposed on the upper surface of the tray. The outer edge of the glass disc is fixedly by the outer cover in a limited way, and the fixed pulley is fixedly disposed on the edge part of the base. The weight is fixedly connected with the outer cover side edge by an inelastic rope, which is disposed on the fixed pulley. By using the frictional resistance calibrating device, results are acquired directly without help of other sensors, and the measurement results are not affected by the precision of the sensors, and then loading is easy to adjust and control, and the calibration precision is improved. The frictional resistance calibrating device has advantages of small device size, simple structure, high maintenance performance, economy, and practicability.
Description
Technical field
It is particularly a kind of for liquid crystal coatings the present invention relates to model swimming cloths fields of measurement in a kind of wind tunnel test
Frictional resistance caliberating device.
Background technology
Under high-speed flight environment, the shared large percentage in aircraft drag overall of frictional resistance not only affects aircraft
Aerodynamic performance, also Aerodynamic Heating is had a significant impact.Used as a hydromechanical element task, frictional resistance forecasting research is subject to
The attention of people, the research institution and university of countries in the world all put into very great studying frictional resistance.Due to by flowing fluidised form
Impact, especially flow under the conditions of hypersonic by laminar flow transition to turbulence state, the prediction of frictional resistance no matter wind tunnel experiment
Or all there is certain difficulty, the complexity of this difficult have its source in frictional resistance absolute magnitude very little and flowing in numerical simulation
Property.
In recent years, China gradually have developed the technology that frictional resistance is measured using shear-sensitive liquid crystal, but how by liquid crystal
The absolute magnitude for becoming colour response and frictional force is established direct links the difficult point of the further development of always one restriction technology.In the past
Scaling method generally to rely on and set up a standard flow field, then carry out measurement of comparison by other sensors, method is complicated
Meanwhile, also it is not easily controlled, and other errors can be introduced, it is impossible to test precision is met well to be required.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, there is provided a kind of frictional resistance for liquid crystal coatings
Caliberating device, it is not necessary to by other sensors, directly obtains result, and measurement result is not affected by other sensor accuracies, loading
Control is easily adjusted, stated accuracy is improve.Device volume is little, simple structure, maintainable high, economical and practical.
The above-mentioned purpose of the present invention is achieved by following technical solution：
A kind of frictional resistance caliberating device for liquid crystal coatings, including glass plate, enclosing cover, pallet, test desk, base,
Fixed pulley and counterweight；Wherein, base is disk mechanism, and base lies in a horizontal plane in least significant end；Test desk is vertically fixed on base
Upper surface；Pallet is fixedly mounted on the upper surface of base；Glass plate is fixedly mounted on the upper surface of pallet；Enclosing cover is fixedly mounted
In the upper surface of pallet；The outward flange of glass plate is fixed by enclosing cover；Fixed pulley is fixedly mounted on the edge of base
Place；Counterweight is fixedly connected by non-resilient rope with enclosing cover lateral edges, and non-resilient rope is placed on fixed pulley.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, the middle setting of described pallet has logical
Hole；Side amount platform is fixedly mounted on the center of base；The top of test desk is through the through hole of pallet and the lower surface of glass plate
Contact；Side amount platform, pallet and glass plate are vertically placed with one heart.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, a diameter of 90-110mm of the glass plate；
Thickness is 8-12mm, thang-kng rate ＞ 95%.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, the test desk is column structure, diameter
For 28-32mm；The upper surface of test desk scribbles liquid crystal coatings, and liquid crystal coatings thickness is 20-30 μm；And test desk material is hard
Aluminium.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, the fixed pulley arranges in the vertical direction
The position contour with enclosing cover, realizes that non-resilient rope applies horizontal shear force under the weight of counterweight to the outer ledge of enclosing cover.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, described counterbalance mass is 1-15g.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, in the surface at glass plate upper surface center
White light source is installed with, the white light source colour temperature is 4900-5100K.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, in the top of glass plate upper surface peace is fixed
Equipped with camera.
In a kind of above-mentioned frictional resistance caliberating device for liquid crystal coatings, the camera and glass disc center position method
Wire clamp angle a is 30-60 °, and camera is fixedly mounted on the opposite of fixed pulley.
The present invention has the advantage that compared with prior art：
(1) present invention employs using simple directly stiction as loading input, be easier compared with gas jet
Obtain, improve economy, loading size is more easily adjusted, and improves stated accuracy；
(2) the whole caliberating device small volume of the present invention, simple structure is maintainable high；
(3) frictional force of present invention loading can be obtained by simple and clear theoretical formula method, it is not necessary to rely on other biographies
Sensor to be providing the friction value of loading, it is to avoid other sensor errors have a negative impact to stated accuracy.
Description of the drawings
Fig. 1 is caliberating device top view of the present invention；
Fig. 2 is caliberating device front view of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail with specific embodiment：
Standard input required for being used as demarcating using stiction, so as to observe sensing element --- liquid crystal is applied
Layer --- the response to frictional force, draws required nominal data.Liquid crystal coatings are a kind of materials sensitive to shearing force, when receiving
During to shear action, the wavelength of liquid crystal reflected light to external world can change, and allow people it is observed that liquid crystal color changes, and
On the direction of shearing force it is observed that color change it is maximum.Therefore, it can be applied with liquid crystal coatings
One block of glass, glass and liquid crystal coatings directly contact are placed on body surface, with counterweight it is applied laterally by fixed pulley
Pulling force (no more than maximum static friction force), and camera is used on the action direction of lateral pull with certain angle of pitch observed and recorded
The color change of liquid crystal coatings, it is final to calculate the corresponding relation calibrated between color change and the shearing force of loading.
Caliberating device top view is illustrated in figure 1, as seen from the figure, a kind of frictional resistance for liquid crystal coatings demarcates dress
Put, including glass plate 1, enclosing cover 2, pallet 3, test desk 4, base 5, fixed pulley 6 and counterweight 7；Wherein, base 5 is disk mechanism,
And base 5 lies in a horizontal plane in least significant end；Test desk 4 is vertically fixed on the upper surface of base 5；Pallet 3 is fixedly mounted on base 5
Upper surface；Glass plate 1 is fixedly mounted on the upper surface of pallet 3；Enclosing cover 2 is fixedly mounted on the upper surface of pallet 3；Glass plate 1
Outward flange is fixed by enclosing cover 2；Fixed pulley 6 is fixedly mounted on the edge of base 5；Counterweight 7 passes through inelastic cord
Rope is fixedly connected with the lateral edges of enclosing cover 2, and non-resilient rope is placed on fixed pulley 6, and the mass of counterweight 7 is 1-15g.
The wherein a diameter of 90-110mm of glass plate 1；Thickness is 8-12mm, thang-kng rate ＞ 95%.
Fixed pulley 6 arranges in the vertical direction and the contour position of enclosing cover 2, realizes weight of the non-resilient rope in counterweight 7
Under horizontal shear force is applied to the outer ledge of enclosing cover 2.
Caliberating device front view is illustrated in figure 2, as seen from the figure, the middle setting of pallet 3 has through hole；Side amount platform 4 is fixed
Installed in the center of base 5；The top of test desk 4 contacts through the through hole of pallet 3 with the lower surface of glass plate 1；Measure side
Platform 4, pallet 3 and glass plate 1 are vertically placed with one heart.
Test desk 4 be column structure, a diameter of 28-32mm；The upper surface of test desk 4 scribbles liquid crystal coatings, liquid crystal coatings
Thickness is 20-30 μm；And the material of test desk 4 is duralumin.
White light source 8 is installed with directly over the upper surface center of glass plate 1, the colour temperature of the white light source 8 is
4900-5100K。
Camera 9 is installed with above the upper surface of glass plate 1；Camera 9 and the center normal angle a of glass plate 1
For 30-60 °, and camera 9 is fixedly mounted on the opposite of fixed pulley 6.
Calibration process：On the amount top surface of platform 4 of side last layer is sprayed to shear sensitive liquid crystal coatings.Treat that liquid crystal coatings are dried
After stable, one piece of optical glass disk 1 is measured on the top surface of platform 4 as side is placed on, and keep both centers of circle just right.To entirely fill
Among being placed in darkroom, given using the positive top surface of offside amount platform 4 of the white light source of the approximate daylight of colour temperature 5000K or so and illuminated,
Arrange camera 9 with the offside of fixed pulley 6 in loading simultaneously.First the initial liquid crystal coatings color of Taking Pictures recording, progressively increases afterwards
Plus the counterweight of equivalent, and record corresponding color.Terminate loading after the counterweight of loading can cover application purpose range.By institute
The digitized image of record imports computer, using image processing techniques, by the color quantizing of gained, obtains one group and describes color
Data.Obtain one group of color data for describing frictional force size.Show that final demarcation is bent by more than fitting two groups of data
Line.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (9)
1. a kind of frictional resistance caliberating device for liquid crystal coatings, it is characterised in that：Including glass plate (1), enclosing cover (2), support
Disk (3), test desk (4), base (5), fixed pulley (6) and counterweight (7)；Wherein, base (5) is disk mechanism, and base (5) water
Placing flat is in least significant end；Test desk (4) is vertically fixed on the upper surface of base (5)；Pallet (3) is fixedly mounted on base (5)
Upper surface；Glass plate (1) is fixedly mounted on the upper surface of pallet (3)；Enclosing cover (2) is fixedly mounted on the upper surface of pallet (3)；Glass
The outward flange of glass disk (1) is fixed by enclosing cover (2)；Fixed pulley (6) is fixedly mounted on the edge of base (5)；Weight
Code (7) is fixedly connected by non-resilient rope with enclosing cover (2) lateral edges, and non-resilient rope is placed on fixed pulley (6).
2. a kind of frictional resistance caliberating device for liquid crystal coatings according to claim 1, it is characterised in that：Described
The middle setting of pallet (3) has through hole；Side amount platform (4) is fixedly mounted on the center of base (5)；The top of test desk (4)
Through hole through pallet (3) is contacted with the lower surface of glass plate (1)；Side amount platform (4), pallet (3) and glass plate (1) are vertically with one heart
Place.
3. a kind of frictional resistance caliberating device for liquid crystal coatings according to claim 2, it is characterised in that：The glass
The a diameter of 90-110mm of glass disk (1)；Thickness is 8-12mm, thang-kng rate ＞ 95%.
4. a kind of frictional resistance caliberating device for liquid crystal coatings according to claim 3, it is characterised in that：The survey
Amount platform (4) is column structure, a diameter of 28-32mm；The upper surface of test desk (4) scribbles liquid crystal coatings, and liquid crystal coatings thickness is
20-30μm；And test desk (4) material is duralumin.
5. a kind of frictional resistance caliberating device for liquid crystal coatings according to claim 4, it is characterised in that：It is described fixed
Pulley (6) arranges in the vertical direction and the contour position of enclosing cover (2), realizes that non-resilient rope is right under the weight of counterweight (7)
The outer ledge of enclosing cover (2) applies horizontal shear force.
6. a kind of frictional resistance caliberating device for liquid crystal coatings according to claim 5, it is characterised in that：Described
Counterweight (7) quality is 1-15g.
7. a kind of frictional resistance caliberating device for liquid crystal coatings according to one of claim 1-6, it is characterised in that：
White light source (8) is installed with directly over glass plate (1) upper surface center, white light source (8) colour temperature is 4900-
5100K。
8. a kind of frictional resistance caliberating device for liquid crystal coatings according to claim 7, it is characterised in that：In glass
Camera (9) is installed with above disk (1) upper surface.
9. a kind of frictional resistance caliberating device for liquid crystal coatings according to claim 8, it is characterised in that：The phase
Machine (9) is 30-60 ° with glass plate (1) center normal angle a, and camera (9) is fixedly mounted on the opposite of fixed pulley (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710064984.3A CN106644226B (en) | 2017-02-06 | 2017-02-06 | Friction resistance calibration device for liquid crystal coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710064984.3A CN106644226B (en) | 2017-02-06 | 2017-02-06 | Friction resistance calibration device for liquid crystal coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106644226A true CN106644226A (en) | 2017-05-10 |
| CN106644226B CN106644226B (en) | 2022-09-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710064984.3A Active CN106644226B (en) | 2017-02-06 | 2017-02-06 | Friction resistance calibration device for liquid crystal coating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607283A (en) * | 2017-07-24 | 2018-01-19 | 南京航空航天大学 | A kind of experimental rig and method of work of measurement plane overall situation friction force vector field |
| CN108225667A (en) * | 2017-12-28 | 2018-06-29 | 北京航空航天大学 | Pixel-level cuts quick liquid crystal scaling method and device |
| CN108240882A (en) * | 2017-12-28 | 2018-07-03 | 北京航空航天大学 | Pixel-level cuts quick liquid crystal calibration and measuring method and system |
| CN110672240A (en) * | 2019-10-23 | 2020-01-10 | 云南师范大学 | Static friction force measuring device based on optical fiber |
| CN113310611A (en) * | 2021-07-12 | 2021-08-27 | 中国兵器工业第五九研究所 | Nondestructive testing device and method for internal stress of short-wavelength characteristic X-ray |
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| CN206450354U (en) * | 2017-02-06 | 2017-08-29 | 中国航天空气动力技术研究院 | A kind of frictional resistance caliberating device for liquid crystal coatings |
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2017
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607283A (en) * | 2017-07-24 | 2018-01-19 | 南京航空航天大学 | A kind of experimental rig and method of work of measurement plane overall situation friction force vector field |
| CN107607283B (en) * | 2017-07-24 | 2019-06-04 | 南京航空航天大学 | A kind of experimental rig and working method measuring plane overall situation friction force vector field |
| CN108225667A (en) * | 2017-12-28 | 2018-06-29 | 北京航空航天大学 | Pixel-level cuts quick liquid crystal scaling method and device |
| CN108240882A (en) * | 2017-12-28 | 2018-07-03 | 北京航空航天大学 | Pixel-level cuts quick liquid crystal calibration and measuring method and system |
| CN108225667B (en) * | 2017-12-28 | 2020-06-30 | 北京航空航天大学 | Pixel-level shear-sensitive liquid crystal calibration method and device |
| CN110672240A (en) * | 2019-10-23 | 2020-01-10 | 云南师范大学 | Static friction force measuring device based on optical fiber |
| CN113310611A (en) * | 2021-07-12 | 2021-08-27 | 中国兵器工业第五九研究所 | Nondestructive testing device and method for internal stress of short-wavelength characteristic X-ray |
| CN113310611B (en) * | 2021-07-12 | 2023-08-18 | 中国兵器工业第五九研究所 | Nondestructive testing device and method for short-wavelength characteristic X-ray internal stress |
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| Publication number | Publication date |
|---|---|
| CN106644226B (en) | 2022-09-06 |
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