CN116660574A - Detection device, flow rate detection method, and flow direction detection method - Google Patents
Detection device, flow rate detection method, and flow direction detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 162
- 239000010408 film Substances 0.000 claims description 201
- 239000012530 fluid Substances 0.000 claims description 78
- 239000010409 thin film Substances 0.000 claims description 30
- 238000012937 correction Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 15
- 230000001419 dependent effect Effects 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 17
- 239000012528 membrane Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000012887 quadratic function Methods 0.000 description 1
- -1 wind Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/02—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
Abstract
The present disclosure proposes a detection apparatus, a flow rate detection method, and a flow direction detection method, wherein the detection apparatus includes: a bottom plate; the top plate is arranged on the bottom plate; the first annular film is arranged between the bottom plate and the top plate; at least five strain detection units, the strain detection units comprising: the first strain gauge is arranged on the first annular film, and at least five first strain gauges are uniformly distributed along the circumferential direction of the first annular film. In the detection device, the flow velocity detection method and the flow direction detection method, the detection device has a larger detection range and higher detection sensitivity, so that the overall universality is effectively improved, meanwhile, the detection device is simpler in structure, so that the overall cost is effectively reduced, and the detection device has better sealing performance, so that the overall environmental adaptability is effectively improved.
Description
Technical Field
The disclosure relates to the technical field of flow velocity and flow direction detection, and in particular relates to a detection device, a flow velocity detection method and a flow direction detection method.
Background
Along with the rapid development of fields such as new energy power, the related fluid direction and fluid speed need to be accurately monitored, but the current sensor for detecting the flow direction and the flow speed comprises: the wind speed is three-cup type, the wind direction is single wing type wind speed and wind direction sensor, ultrasonic wind speed and wind direction sensor, thermal type wind speed sensor, etc., although these sensors can satisfy the detection demand of wind direction, wind speed, but all have certain requirement to the test environment, lead to the environmental suitability of these sensors relatively poor, simultaneously, because the restriction of self detection principle leads to the range of these sensors less, sensitivity is lower for holistic commonality is relatively poor, and moreover, these sensors structure is complicated, and the device that uses is comparatively expensive, leads to holistic cost relatively high.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
To this end, an object of the present disclosure is to provide a detection device, a flow rate detection method, and a flow direction detection method.
To achieve the above object, a first aspect of the present disclosure provides a detection device, including: the device comprises a bottom plate, a top plate, a first annular film and at least five strain detection units; wherein the first annular film is disposed between the bottom plate and the top plate, the strain detection unit includes: the first strain gauge is arranged on the first annular film, and at least five first strain gauges are uniformly distributed along the circumferential direction of the first annular film.
Optionally, the detection device further includes: the second annular film is arranged between the bottom plate and the top plate, and is positioned at the inner side of the first annular film, and a first deformation space is arranged between the second annular film and the first annular film; and a second strain gauge disposed on the second annular film.
Optionally, the strain detection unit further includes: a strain detection circuit, the strain detection circuit comprising: the first end of the first resistor is connected with the positive electrode of the power supply, the second end of the first resistor is connected with the first end of the second strain gauge, the second end of the second strain gauge is connected with the negative electrode of the power supply, the first end of the second resistor is connected with the first end of the first resistor, the second end of the second resistor is connected with the first end of the first strain gauge, and the second end of the first strain gauge is connected with the second end of the second strain gauge.
Optionally, the detection device further includes: the telescopic assembly is arranged on the bottom plate, the top plate is arranged at one end of the telescopic assembly away from the bottom plate, the telescopic assembly is positioned at the inner side of the second annular film, and a second deformation space is arranged between the telescopic assembly and the second annular film.
Optionally, a side of the top plate, which is close to the bottom plate, and a side of the bottom plate, which is close to the top plate, are both provided with a first ring groove and a second ring groove, the second ring groove is located at the inner side of the first ring groove, one end of the first annular film is arranged in the first ring groove through a first filling medium, and one end of the second annular film is arranged in the second ring groove through a second filling medium.
Optionally, the at least five strain detection units include: eight strain detection units, eight first strain gauges along circumference evenly distributed of first annular film the inboard of first annular film.
A second aspect of the present disclosure provides a flow rate detection method applied to the detection apparatus as provided in the first aspect of the present disclosure, the method including: obtaining the minimum tensile strain of the first annular film at different flow rates, and obtaining a first corresponding relation between the flow rate and the minimum tensile strain; fitting a first formula according to the first corresponding relation; and placing the detection device in an actual wind field, acquiring the minimum tensile strain of the first annular film through at least five first strain sheets, and acquiring the flow velocity of the actual wind field according to the first formula.
Optionally, the fitting the first formula according to the first correspondence includes: fitting the first corresponding relation with a plurality of function formulas, and obtaining a first function formula with highest fitting degree with the first corresponding relation, wherein the first function formula comprises: a first argument, a second argument, and a first argument; the minimum tensile strain of the first annular film is taken as the first self-strainTaking the elastic modulus of the first annular film as the second independent variable, taking the flow rate as the first dependent variable, and obtaining a calculated flow rate according to the first function formula; compensating the difference between the calculated flow rate and the actual flow rate into a first stress variable of the first function formula as a first correction coefficient to obtain the first formula; wherein, the first formula is: gamma ray 1 V＝AεE B The method comprises the steps of carrying out a first treatment on the surface of the The V is the flow rate, the gamma 1 Is a first correction factor, epsilon is the minimum tensile strain of the first annular film, E is the elastic modulus of the first annular film, A is a first factor, and B is a second factor.
A third aspect of the present disclosure provides a flow direction detection method, which is applied to the detection apparatus provided in the first aspect of the present disclosure, and the method includes: establishing a tensile strain coordinate along the circumferential direction of the first annular film by taking the minimum tensile strain of the first annular film as a basic strain value, and establishing an angle coordinate along the circumferential direction of the first annular film by taking the angle of the positive pair fluid surface of the first annular film as a basic angle value, so as to obtain a second corresponding relation between the tensile strain coordinate and the angle coordinate; fitting a second formula according to the second corresponding relation; placing the detection device in an actual wind field, acquiring non-minimum tensile strain adjacent to the minimum tensile strain of the first annular film through at least five first strain sheets, and acquiring an angle corresponding to the non-minimum tensile strain according to the second formula; and obtaining the angle of the positive pair of fluid surfaces of the first annular film according to the angle corresponding to the non-minimum tensile strain so as to obtain the flow direction of the actual wind field.
Optionally, the fitting the second formula according to the second correspondence includes: fitting the second corresponding relation with a plurality of function formulas, and obtaining a second function formula with highest fitting degree with the second corresponding relation, wherein the second function formula comprises: a third independent variable, a fourth independent variable, a fifth independent variable and a second dependent variable; the minimum tensile strain of the first annular film is used as the first independent variable, the non-minimum tensile strain adjacent to the minimum tensile strain is used as the second independent variable, and theThe elastic modulus of the first annular film is used as the third independent variable, the angle corresponding to the non-minimum tensile strain is used as the second dependent variable, and a calculated angle is obtained according to the second function formula; compensating the difference between the calculated angle and the actual angle as a second correction coefficient into a second strain amount of the second function formula to obtain the second formula; wherein the second formula is: gamma ray 2 Eε 1 epsilon=c-Dcos (Fx) -Gsin (Hx); the gamma is 2 Is a second correction factor, said E is the elastic modulus of said first annular film, said ε is the minimum tensile strain of said first annular film, said ε 1 Is a non-minimum tensile strain adjacent to said ε, and said x is said ε 1 Corresponding angles, C is the third coefficient, D is the fourth coefficient, F is the fifth coefficient, G is the sixth coefficient, and H is the seventh coefficient.
The technical scheme provided by the disclosure can comprise the following beneficial effects:
the detection device detects the fluid direction and the fluid speed by utilizing the strain of the first strain gauge, so that the detection device has a larger detection range and higher detection sensitivity, the overall universality is effectively improved, meanwhile, the detection device is simpler in structure, the related devices such as the first annular film and the first strain gauge are cheaper, the overall cost is effectively reduced, and the first annular film is arranged between the top plate and the bottom plate and forms a closed structure close to a cylinder, so that the detection device has better tightness, the whole detection device can be suitable for environments such as wind and water, and the overall environmental adaptability is effectively improved.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic top view of a detection device according to an embodiment of the disclosure;
FIG. 2 is a schematic cross-sectional elevation view of a detection apparatus according to an embodiment of the present disclosure;
FIG. 3 is a schematic circuit diagram of a strain detection circuit in a detection apparatus according to an embodiment of the disclosure;
FIG. 4 is a schematic circuit diagram of a detection device according to an embodiment of the disclosure;
FIG. 5 is a schematic partial cross-sectional view of a detection device according to an embodiment of the present disclosure;
FIG. 6 is a flow chart of a flow rate detection method according to an embodiment of the present disclosure;
FIG. 7 is a flow chart illustrating a flow direction detection method according to an embodiment of the disclosure;
FIG. 8 is a schematic diagram of a test device according to an embodiment of the present disclosure at a flow rate of 1 m/s;
FIG. 9 is a schematic diagram of a test device according to an embodiment of the present disclosure at a flow rate of 10 m/s;
FIG. 10 is a schematic diagram of a test device according to an embodiment of the present disclosure at a flow rate of 30 m/s;
FIG. 11 is a schematic diagram of tensile strain coordinates and angular coordinates established in a flow direction detection method according to an embodiment of the present disclosure;
As shown in the figure: 1. a bottom plate, 2, a top plate, 3 and a first annular film;
4. a strain detection unit;
41. a first strain gage;
42. strain detection circuit 421, first resistor, 422, second resistor;
5. the second annular film, 6, the first deformation space, 7 and the second strain gage;
8. a telescopic component 81 and a threaded rod;
9. the first deformation space, 10, the first annular groove, 11, the second annular groove, 12, the first filling medium, 13 and the second filling medium.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
As shown in fig. 1, 2, 4 and 5, the embodiment of the disclosure proposes a detection device, which includes a bottom plate 1, a top plate 2, a first annular film 3 and at least five strain detection units 4, wherein the first annular film 3 is disposed between the bottom plate 1 and the top plate 2, the strain detection units 4 include first strain gauges 41, the first strain gauges 41 are disposed on the first annular film 3, and the at least five first strain gauges 41 are uniformly distributed along the circumferential direction of the first annular film 3.
It can be appreciated that by disposing the first annular thin film 3 between the bottom plate 1 and the top plate 2, the detection device forms a detection structure approaching a cylinder, wherein the strain change curves in the circumferential direction of the first annular thin film 3 are substantially consistent at different flow rates based on the flow principle of single-column bypass, and the minimum strain force of the first annular thin film 3 has a corresponding relationship with the flow rate, so that the flow direction and the flow rate can be accurately detected by detecting the strain force distribution and the minimum strain force in the circumferential direction of the first annular thin film 3 through the at least five first strain gauges 41, thereby meeting the detection requirements of the flow direction and the flow rate.
The detection device detects the fluid direction and the fluid speed by utilizing the strain of the first strain gauge 41, so that the detection device has a larger detection range and higher detection sensitivity, the overall universality is effectively improved, meanwhile, the structure of the detection device is simpler, the related devices such as the first annular film 3 and the first strain gauge 41 are cheaper, the overall cost is effectively reduced, and the first annular film 3 is arranged between the top plate 2 and the bottom plate 1 and forms a closed structure close to a cylinder, so that the detection device has better tightness, the whole device can be suitable for environments such as wind, water and the like, and the overall environmental adaptability is effectively improved.
It should be noted that, specific types of the bottom plate 1 and the top plate 2 can be set according to actual needs, which is not limited, and the bottom plate 1 and the top plate 2 can be arranged in parallel, so that the first annular film 3 can be uniformly deformed, and further, accurate detection of the detection device is ensured, and the size of the bottom plate 1 can be larger than that of the top plate 2, so that a plurality of uniformly distributed fixing holes are arranged on the bottom plate 1, and further, the bottom plate 1 is conveniently fixed by using the plurality of fixing holes, and stable detection of the detection device is ensured.
The specific type of the first annular film 3 may be set according to actual needs, and this is not limited, and the size of the first annular film 3 may be an annular film with a diameter of 100mm and a thickness of 1mm, and the first annular film 3 may be a metal material such as steel or a flexible material such as rubber.
Wherein, because first annular film 3 is annular structure for when first annular film 3 set up between bottom plate 1 and roof 2, bottom plate 1 and roof 2 can form the shutoff to the both ends of first annular film 3, and then make detection device form the enclosed construction that is close the cylinder, and when the enclosed construction of cylinder was used, the inside that fluid such as wind, water can't enter into detection device caused the damage to detection device, and then guaranteed detection device in environment such as wind, water stronger adaptability.
The first annular film 3 can be replaced according to different environments, and for example, in a cold environment, the material of the first annular film 3 can be made of metal materials such as steel, so as to ensure the stable deformation of the first annular film 3, and simultaneously, the ice and snow can be conveniently removed through heating; in a non-severe cold and non-high temperature environment, when a micro flow rate needs to be measured, in order to make the first annular film 3 have higher sensitivity, a flexible material such as rubber can be used as the material of the first annular film 3; for higher fluid speeds, materials with higher modulus of elasticity may be used; for lower fluid velocities, materials with lower elastic moduli may be used.
The specific type of the first strain gauge 41 may be set according to actual needs, which is not limited to this, and the first strain gauge 41 may be a long-sheet structure, and the length direction of the first strain gauge 41 is parallel to the axial direction of the first annular film 3, and the first strain gauge 41 is adhered to the inner side of the first annular film 3.
In the overall simulation experiment, the stress of the first annular film 3 in the axial direction can be not considered, and at this time, the average strain of the first strain gauge 41 along the length direction thereof should be measured, so that the influence of uneven strain distribution of the first strain gauge 41 along the length direction thereof on the detection result is eliminated, thereby the first strain gauge 41 can cover the first annular film 3 in the length direction thereof and a deformation space and a pasting operation space are reserved between the first strain gauge 41 and the top plate 2 and the bottom plate 1.
The specific type of fluid may be set according to actual needs, and is not limited thereto, and the fluid may be wind, water, or the like, for example.
When the detection device of the embodiment is simulated, ansys Fluent software can be adopted to simulate and calculate the stress condition of the first annular film 3 under different fluid fields, wherein the flow rate can be set to be 1m/s, 2m/s, 3m/s, 4m/s, 5m/s, 10m/s, 20m/s, 30m/s, 35m/s and the like, the diameter of the first annular film 3 can be 100mm, the thickness can be 1mm, and the air medium density in the whole environment can be 1.225kg/m 3 The dynamic viscosity coefficient can be 1.7894 ×10 -5 kg/(m·s)。
Based on the flow rates of 1m/s, 10m/s, 30m/s and the like, simulation can be performed to obtain stress cloud charts at different flow rates, wherein the maximum compressive stress of the front fluid surface of the first annular film 3 can be obtained according to the different stress cloud charts, the maximum compressive strain can be obtained, the maximum tensile stress of the two side surfaces of the first annular film 3 can be obtained, the minimum tensile stress of the back fluid surface of the first annular film 3 can be obtained, the strain force around the first annular film 3 is increased along with the increase of the fluid speed, the strain change curve in the circumferential direction of the first annular film 3 is basically consistent, and therefore the position of the front fluid surface of the first annular film 3 can be obtained according to the relative position between the strain force and the maximum compressive stress, and the direction of fluid is determined.
Meanwhile, based on the flow rates of 1m/s, 10m/s and 30m/s, the schematic diagrams shown in fig. 8 to 10 can be obtained, in fig. 8 to 10, the horizontal axis is the distance between each position of the first annular film 3 after being unfolded along the circumferential direction and the surface opposite to the fluid, the vertical axis is the fluid pressure born by each position of the first annular film 3 along the circumferential direction, and can also be understood as the strain force on the first annular film 3, as can be seen from fig. 8 to 10, the 0m position is the surface of the first annular film 3 opposite to the fluid, the compressive stress born by the first annular film is the largest, the +/-0.25 m is the two side surfaces of the first annular film 3, the tensile stress born by the first annular film 3 is the largest, the tensile stress born by the first annular film 3 is the smallest in the range of-0.25 m to-0.15 m and the surface opposite to the fluid, and the coverage range of the tensile stress born by the first annular film 3 is approximately 90 degrees, and meanwhile, the fluctuation of the strain force in the range of the value is small, and the value is basically consistent.
Wherein, since the detecting device detects the strain in the circumferential direction of the first annular thin film 3 through the at least five first strain gages 41, and the minimum tensile strain coverage of the first annular thin film 3 is close to 90 degrees, the at least one first strain gages 41 can detect the minimum tensile strain of the first annular thin film 3, thereby enabling the direction of the fluid and the velocity of the fluid to be obtained by using the minimum tensile strain of the first annular thin film 3 as a whole.
As shown in fig. 1, 2, 4 and 5, in some embodiments, the detection device further includes a second annular film 5 and a second strain gauge 7, the second annular film 5 is disposed between the bottom plate 1 and the top plate 2, the second annular film 5 is located inside the first annular film 3, a first deformation space 6 is disposed between the second annular film 5 and the first annular film 3, and the second strain gauge 7 is disposed on the second annular film 5.
It can be understood that through setting up second annular film 5 between bottom plate 1 and roof 2, and be located the inboard of first annular film 3 with second annular film 5, make first annular film 3 can not receive the influence of second annular film 5 when carrying out the deformation, simultaneously, second annular film 5 also can not receive the influence of first annular film 3 when the deformation, moreover, because second foil gage 7 sets up on second annular film 5, make detection device can utilize second foil gage 7 to detect the temperature of its place environment, and then eliminate the influence of environment to whole testing result through temperature compensation, guarantee detection device's accurate detection.
The specific type of the second annular film 5 may be set according to actual needs, and this is not limited to this, and the second annular film 5 may be a metal material such as steel or a flexible material such as rubber, for example.
The second annular film 5 may be replaced according to different environments, for example, in a cold environment, a metal material such as steel may be used as the material of the second annular film 5, so as to ensure stable deformation of the second annular film 5, and facilitate removal of ice and snow through heating; in a non-severe cold and non-high temperature environment, in order to make the second annular film 5 have higher sensitivity, the material of the second annular film 5 can use flexible materials such as rubber; for higher fluid speeds, materials with higher modulus of elasticity may be used; for lower fluid velocities, materials with lower elastic moduli may be used.
The specific type of the second strain gauge 7 may be set according to actual needs, which is not limited to this, and the second strain gauge 7 may be a long-sheet structure, and the length direction of the second strain gauge 7 is parallel to the axial direction of the second annular film 5, and the second strain gauge 7 is adhered to the outer side of the second annular film 5.
In the simulation experiment, the stress of the second annular film 5 in the axial direction can be not considered, and at this time, the average strain of the second strain gauge 7 along the length direction thereof is measured, so that the influence of uneven strain distribution of the second strain gauge 7 along the length direction thereof on the detection result is eliminated, and therefore, the second strain gauge 7 can cover the second annular film 5 along the length direction thereof and a deformation space and a pasting operation space are reserved between the second strain gauge 7 and the top plate 2 and the bottom plate 1.
As shown in fig. 3 and 4, in some embodiments, the strain detection unit 4 further includes a strain detection circuit 42, where the strain detection circuit 42 includes a first resistor 421, a second resistor 422, a first strain gauge 41, and a second strain gauge 7, the first end of the first resistor 421 is connected to the positive electrode of the power supply, the second end of the first resistor 421 is connected to the first end of the second strain gauge 7, the second end of the second strain gauge 7 is connected to the negative electrode of the power supply, the first end of the second resistor 422 is connected to the first end of the first resistor 421, the second end of the second resistor 422 is connected to the first end of the first strain gauge 41, and the second end of the first strain gauge 41 is connected to the second end of the second strain gauge 7.
It can be understood that the first resistor 421, the second resistor 422, the first strain gauge 41 and the second strain gauge 7 form a wheatstone bridge circuit, when the first strain gauge 41 deforms and causes the resistance value thereof to change, the voltage difference between the first end of the second strain gauge 7 and the second end of the second resistor 422 also changes, so that the detecting device can obtain the deformation amount of the first strain gauge 41 according to the voltage difference between the first end of the second strain gauge 7 and the second end of the second resistor 422, thereby obtaining the strain force in the circumferential direction of the first annular film 3 according to the deformation amount of the first strain gauge 41, and further obtaining the direction of the fluid and the speed of the fluid according to the strain force in the circumferential direction of the first annular film 3, and meanwhile, the detecting device can realize temperature compensation by using the second strain gauge 7 while detecting the direction of the fluid and the speed of the fluid by using the first strain gauge 41, thereby ensuring the detection accuracy of the detecting device.
It should be noted that, when the initial strain values of the first strain gauge 41 and the second strain gauge 7 approach zero, the wheatstone bridge circuit is in a balanced state at this time, so before the detection device detects, the initialization and the zeroing should be performed to ensure the overall accurate detection.
Specific resistance values of the first resistor 421 and the second resistor 422 may be set according to actual needs, which is not limited.
Current flowing through the first resistor 421 and the second strain gauge 7I 1 The method comprises the following steps:
wherein VCC is the voltage of the power supply, R 1 Is the resistance value of the first resistor 421, R b2 Is the resistance value of the second strain gauge 7.
Further, the voltage V1 of the second strain gauge 7 is calculated as:
current I flowing through second resistor 422 and first strain gage 41 2 The method comprises the following steps:
wherein R is 2 Is the resistance value of the second resistor 422, R b1 Is the resistance value of the first strain gage 41.
Further, it is deduced that the voltage V2 of the second resistor 422 is:
the voltage difference V between the first end of the second strain gauge 7 and the second end of the second resistor 422 is:
from this, it can be seen that the strain force in the circumferential direction of the temperature-compensated first annular membrane 3 can be determined by the voltage difference between the first end of the second strain gauge 7 and the second end of the second resistor 422.
The power supply and strain detection circuit 42 may be provided in a strain gauge, with a plurality of ports of the strain gauge being connected to a plurality of first and second strain gages 41, 7, respectively.
As shown in fig. 1 and 2, in some embodiments, the detection device further includes a telescopic assembly 8, the telescopic assembly 8 is disposed on the bottom plate 1, the top plate 2 is disposed at an end of the telescopic assembly 8 away from the bottom plate 1, the telescopic assembly 8 is located on the inner side of the second annular film 5, and a second deformation space 9 is disposed between the telescopic assembly 8 and the second annular film 5.
It can be appreciated that, because the telescopic component 8 is arranged on the bottom plate 1, the top plate 2 is arranged at one end of the telescopic component 8 away from the bottom plate 1, so that the top plate 2 can be stably arranged relative to the bottom plate 1 by using the support of the telescopic component 8, and because the telescopic component 8 is positioned on the inner side of the second annular film 5, and the second deformation space 9 is arranged between the telescopic component 8 and the second annular film 5, the telescopic component 8 can avoid influencing the second annular film 5 and the first annular film 3 while supporting the top plate 2, and the accurate detection of the detection device is ensured.
Wherein, because flexible characteristic of flexible subassembly 8 for distance between roof 2 and the bottom plate 1 can be adjusted, and then make the elasticity of first annular film 3 and second annular film 5 can be adjusted, from this, detection device can utilize flexible subassembly 8 to carry out the initialization zeroing of first foil gage 41 and second foil gage 7, thereby further guaranteed detection device's accurate detection.
It should be noted that, the first deformation space 6 and the second deformation space 9 are used for providing a space for deformation of the first annular film 3 and the second annular film 5, so as to avoid interference between the first annular film 3, the second annular film 5 and the expansion assembly 8, and specific dimensions of the first deformation space 6 and the second deformation space 9 can be set according to actual needs, which is not limited.
The telescopic assembly 8 is used for adjusting the distance between the top plate 2 and the bottom plate 1, and the specific type of the telescopic assembly 8 can be set according to actual needs, which is not limited.
As shown in fig. 1 and 2, in some embodiments, the telescopic assembly 8 includes a threaded rod 81, the threaded rod 81 is disposed on the bottom plate 1 in a threaded manner, and one end of the threaded rod 81 away from the bottom plate 1 abuts against the top plate 2, the threaded rod 81 is located on the inner side of the second annular film 5, and a second deformation space 9 is provided between the threaded rod 81 and the second annular film 5.
It can be appreciated that, because the threaded rod 81 is arranged on the bottom plate 1, and one end of the threaded rod 81 away from the bottom plate 1 is abutted against the top plate 2, when the threaded rod 81 rotates relative to the bottom plate 1, the threaded rod can move along the direction close to or away from the top plate 2, so that the adjustment of the distance between the top plate 2 and the bottom plate 1 is realized, and the tightness adjustment of the first annular film 3 and the second annular film 5 is realized, therefore, the detection device can utilize the rotation of the threaded rod 81 to perform the initialization zero setting of the first strain gauge 41 and the second strain gauge 7, and the accurate detection of the detection device is further ensured.
It should be noted that, the specific setting mode of the threaded rod 81 on the bottom plate 1 may be set according to actual needs, which is not limited in this respect, and the bottom plate 1 is provided with a sleeve, an internal thread is provided in the sleeve, one end of the threaded rod 81 is provided with an external thread, and the external thread and the internal thread are screwed, so as to realize the thread setting of the threaded rod 81 on the bottom plate 1.
The specific arrangement mode of the threaded rod 81 on the top plate 2 can be set according to actual needs, which is not limited, and one end of the threaded rod 81 far away from the bottom plate 1 can be directly abutted with the top plate 2; the end of the threaded rod 81 remote from the bottom plate 1 may be connected to the top plate 2 by bearings to reduce wear between the threaded rod 81 and the top plate 2.
As shown in fig. 5, in some embodiments, a first ring groove 10 and a second ring groove 11 are provided on both the side of the top plate 2 near the bottom plate 1 and the side of the bottom plate 1 near the top plate 2, the second ring groove 11 is located inside the first ring groove 10, one end of the first annular film 3 is provided in the first ring groove 10 by a first filling medium 12, and one end of the second annular film 5 is provided in the second ring groove 11 by a second filling medium 13.
It will be appreciated that the two ends of the first annular film 3 are respectively connected with the top plate 2 and the bottom plate 1 through the first filling medium 12, and the two ends of the second annular film 5 are respectively connected with the top plate 2 and the bottom plate 1 through the second filling medium 13, so that stable arrangement of the first annular film 3 and the second annular film 5 between the top plate 2 and the bottom plate 1 is ensured, and stress of the first annular film 3 and the second annular film 5 between the top plate 2 and the bottom plate 1 is more uniform, meanwhile, due to arrangement of the first annular groove 10 and the second annular groove 11, the first filling medium 12 and the second filling medium 13 are more stably arranged on the top plate 2 and the bottom plate 1, and stable arrangement of the first annular film 3 and the second annular film 5 between the top plate 2 and the bottom plate 1 is further ensured.
It should be noted that the specific types of the first filling medium 12 and the second filling medium 13 may be set according to actual needs, which is not limited to this, and the first filling medium 12 and the second filling medium 13 may be glue, for example.
As shown in fig. 1 and 4, in some embodiments, the at least five strain detecting units 4 include eight strain detecting units 4, and eight first strain gages 41 are uniformly distributed inside the first annular film 3 in the circumferential direction of the first annular film 3.
It can be appreciated that, since the minimum tensile strain coverage of the first annular thin film 3 is close to 90 degrees, and the eight first strain gages 41 are uniformly distributed along the circumferential direction of the first annular thin film 3, at least two first strain gages 41 can detect the minimum tensile strain of the first annular thin film 3, so that the minimum tensile strain of the first annular thin film 3 can be obtained quickly by using the two first strain gages 41 as a whole, and the overall detection precision and detection efficiency are improved.
When the eight first strain gages 41 detect the strain in the circumferential direction of the first annular film 3, two first strain gages 41 having the same or close detection values may be selected by comparison, and the strain detected by the first strain gages 41 may be directly used as the minimum tensile strain.
As shown in fig. 6, an embodiment of the present disclosure further provides a flow rate detection method, which is applied to the detection device according to the embodiment of the present disclosure, and the method includes
S11: obtaining the minimum tensile strain of the first annular film 3 at different flow rates, and obtaining a first corresponding relation between the flow rate and the minimum tensile strain;
s12: fitting a first formula according to the first corresponding relation;
s13: the detection means are placed in the actual fluid field, the minimum tensile strain of the first annular membrane 3 is obtained by means of at least five first strain gauges 41, and the flow rate of the actual fluid field is obtained according to a first formula.
It can be understood that a stable corresponding relation exists between the flow rate and the minimum tensile strain, so that the first corresponding relation between the flow rate and the minimum tensile strain can be obtained by obtaining the minimum tensile strain of the first annular film 3 at different flow rates, and then a first formula is fitted according to the first corresponding relation, so that when the detection device is placed in an actual fluid field, the speed of the fluid can be obtained rapidly and accurately by the first strain gauge 41 and the first formula on the first annular film 3, and further, the high-efficiency and accurate detection of the fluid speed by the detection device can be ensured.
It should be noted that in step S11, simulation software may be used to simulate the detection device to obtain the minimum tensile strain of the first annular thin film 3 at different flow rates, where the number of corresponding data and the interval value between adjacent data in the first corresponding relationship may be set according to actual needs, which is not limited, and the following table illustrates an example:
Wherein eight sets of data are listed, wherein the minimum pull strain of the first annular film 3 becomes 0.01Pa when the fluid velocity is 1m/s, the minimum pull strain of the first annular film 3 becomes 0.02Pa when the fluid velocity is 2m/s, the minimum pull strain of the first annular film 3 becomes 0.4Pa when the fluid velocity is 4m/s, the minimum pull strain of the first annular film 3 becomes 0.7Pa when the fluid velocity is 5m/s, the minimum pull strain of the first annular film 3 becomes 4.7Pa when the fluid velocity is 10m/s, the minimum pull strain of the first annular film 3 becomes 32Pa when the fluid velocity is 20m/s, the minimum pull strain of the first annular film 3 becomes 83Pa when the fluid velocity is 35m/s, and the minimum pull strain of the first annular film 3 becomes 96Pa when the fluid velocity is 20 m/s.
In some embodiments, S12: fitting a first formula according to the first correspondence includes
S121: fitting the first corresponding relation with a plurality of function formulas, and obtaining a first function formula with highest fitting degree with the first corresponding relation, wherein the first function formula comprises a first independent variable, a second independent variable and a first stress variable;
s122: taking the minimum tensile strain of the first annular thin film 3 as a first independent variable, taking the elastic modulus of the first annular thin film 3 as a second independent variable, taking the flow rate as a first dependent variable, and obtaining a calculated flow rate according to a first function formula;
S123: and compensating the difference between the calculated flow rate and the actual flow rate into a first stress variable of a first function formula as a first correction coefficient to obtain the first formula.
It can be understood that the first function formula with the highest fitting degree is obtained by fitting the first corresponding relation with a plurality of function formulas, so that the detection device can rapidly obtain the fluid speed by using the first strain gauge 41 on the first annular film 3 and the first function formula, further high-efficiency detection of the fluid speed by the detection device is ensured, and the first correction coefficient is compensated into the first function formula and the first formula is obtained by test correction, so that the detection device can accurately obtain the fluid speed by using the first strain gauge 41 on the first annular film 3 and the first formula, and further accurate detection of the fluid speed by the detection device is ensured.
It should be noted that in step S121, the relationship between the minimum tensile strain and the wind speed may be obtained according to the pressure coefficient formula and the resistance coefficient formula, so that the selection range of the function formula is narrowed according to the relationship, and further the fitting efficiency and the fitting accuracy of the first correspondence and the function formula are improved.
Wherein, the pressure coefficient Cpi is:
Wherein P is i Is the surface pressure (Pa) at a point in the circumferential direction of the first annular membrane 3,P ∞ for the incoming hydrostatic pressure (Pa) of the first annular membrane 3, ρ is the fluid density (kg/m 3 ) V is the fluid velocity (m/s).
Coefficient of resistance C D The method comprises the following steps:
and θ is the angle between the normal direction of the measuring point and the incoming flow.
The fitting of the first correspondence to the function formula may be set according to actual needs, which is not limited, and the following table is illustrated by way of example:
| linear function | y＝0.3265x+4.346 | Fitting degree of 0.95 |
| Quadratic function | y＝-0.00297x 2 +0.5949x+3.536 | Fitting degree of 0.97 |
| Exponentiation function | y＝5.181x 0.407 | Fitting degree of 0.99 |
| Trigonometric function | y＝33.16sin(0.0156x+0.111) | Fitting degree of 0.96 |
The fitting degree of the first corresponding relation and the primary function is 0.95, the fitting degree of the first corresponding relation and the secondary function is 0.97, the fitting degree of the first corresponding relation and the power function is 0.99, and the fitting degree of the first corresponding relation and the trigonometric function is 0.96. It can be seen that the fitting degree of the first correspondence relation and the power function is highest, so that the power function is utilized and combined with the first correction coefficient as the first formula, and the first correction coefficient can be obtained through experiments.
In some embodiments, the first formula is γ 1 V＝AεE B The method comprises the steps of carrying out a first treatment on the surface of the Wherein V is the flow rate, gamma 1 Is a first correction coefficient, ε is the minimum strain of the first annular membrane 3, E is the elastic modulus of the first annular membrane 3, A is a first coefficient, and B is a second coefficient.
It will be appreciated that when the detection device is placed in an actual fluid field, since the minimum tensile strain of the first annular membrane 3 can be obtained by using the first strain gauge 41, and the elastic modulus of the first annular membrane 3 after the material of the first annular membrane 3 is determined, the fluid velocity can be obtained rapidly and accurately by using the minimum tensile strain of the first annular membrane 3, the elastic modulus of the first annular membrane 3, and the first formula, thereby ensuring efficient and accurate detection of the fluid velocity by the detection device.
It should be noted that the specific values of the first coefficient a and the second coefficient B may be calculated according to the application scenario, which is not limited thereto, and the first coefficient a may be 5.181, the second coefficient B may be 0.407, i.e. the first formula is γ 1 V＝5.181εE 0.407 。
As shown in fig. 7, an embodiment of the present disclosure further provides a flow direction detection method, which is applied to the detection device according to the embodiment of the present disclosure, and the method includes
S21: the minimum tensile strain of the first annular film 3 is used as a basic strain value to pull a strain coordinate along the circumference Xiang Jianli of the first annular film 3, and the angle of the positive pair fluid surface of the first annular film 3 is used as a basic angle value to establish an angle coordinate along the circumference of the first annular film 3, so that a second corresponding relation between the tensile strain coordinate and the angle coordinate is obtained;
S22: fitting a second formula according to the second corresponding relation;
s23: placing the detection device in an actual fluid field, acquiring non-minimum tensile strain adjacent to the minimum tensile strain of the first annular film 3 through at least five first strain gages 41, and acquiring an angle corresponding to the non-minimum tensile strain according to a second formula;
s24: and obtaining the angle of the positive fluid surface of the first annular film 3 according to the angle corresponding to the non-minimum tensile strain so as to obtain the flow direction of the actual fluid field.
It can be understood that by setting the minimum tensile strain of the first annular thin film 3 as a basic strain value along the circumference Xiang Jianli of the first annular thin film 3 and setting the angle coordinates along the circumference of the first annular thin film 3 with the angle of the front fluid surface of the first annular thin film 3 as a basic angle value, the second correspondence relationship between the tensile strain coordinates and the angle coordinates in the circumference of the first annular thin film 3 can be set up, and the strain change curves in the circumference of the first annular thin film 3 are substantially uniform, and therefore, when the tensile strain of a certain position is obtained, the position of the front fluid surface of the first annular thin film 3 can be obtained according to the position, and thus the direction of the fluid can be obtained.
The second formula is fitted according to the second corresponding relation, so that when the detection device is placed in an actual fluid field, the direction of the fluid can be obtained rapidly and accurately by the aid of the first strain gauge 41 and the second formula on the first annular film 3, and the detection device can detect the direction of the fluid efficiently and accurately.
The establishment of the tensile strain coordinates and the angular coordinates may be performed according to actual needs, and is not limited thereto, and as illustrated in fig. 11, the angle of the face facing the fluid is set to 0 degrees as a basic angle value, the angular coordinates are sequentially established at intervals of 11.25 degrees in the clockwise direction, the minimum tensile strain of the first annular film 3 is set to 1 as a basic strain value, the tensile strain of the first annular film 3 is compared with 1 at a position corresponding to the angular coordinates in the circumferential direction, and a plurality of ratios form the tensile strain coordinates, wherein when the strain at a certain position becomes compressive strain, the tensile strain becomes negative.
Wherein, as shown in FIG. 11, when the circumferential angle of the first annular film 3 is 0 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is-11.33; when the circumferential angle of the first annular film 3 is 11.25 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is-11.33; when the circumferential angle of the first annular film 3 is 22.5 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is-7.67; when the circumferential angle of the first annular film 3 is 33.75 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is-0.72; the ratio of the tensile strain at this position to the minimum tensile strain is 4.5 when the circumferential angle of the first annular film 3 is 45 degrees, and 9.8 when the circumferential angle of the first annular film 3 is 56.25 degrees; when the circumferential angle of the first annular film 3 is 67.5 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is 16.8; when the circumferential angle of the first annular film 3 is 78.75 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is 20.3; when the circumferential angle of the first annular film 3 is 90 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is 20.3; when the circumferential angle of the first annular film 3 is 101.25 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is 18.7; when the circumferential angle of the first annular film 3 is 112.25 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is 13.4; when the circumferential angle of the first annular film 3 is 132.75 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is 6.3; when the circumferential angle of the first annular film 3 is 135 degrees, the ratio of the tensile strain at this position to the minimum tensile strain is 1.
As can be seen from fig. 11, the strain ratio of the corresponding positions of the first annular thin film 3 is the same between the first annular thin film 3 and the second annular thin film at the circumferential angle of 0 to 180 degrees and the second annular thin film at the circumferential angle of 180 to 360 degrees, so that the second formula can be directly used when the range of 0 to 180 degrees is used, and the angle compensation needs to be added to the angle corresponding to the non-minimum tensile strain adjacent to the minimum tensile strain in the second formula when the range of 180 to 360 degrees is used.
In some embodiments, S22: fitting a second formula according to a second correspondence includes
S221: fitting the second corresponding relation with a plurality of function formulas, and obtaining a second function formula with highest fitting degree with the second corresponding relation, wherein the second function formula comprises a third independent variable, a fourth independent variable, a fifth independent variable and a second dependent variable;
s222: taking the minimum tensile strain of the first annular film 3 as a first independent variable, taking the non-minimum tensile strain adjacent to the minimum tensile strain as a second independent variable, taking the elastic modulus of the first annular film 3 as a third independent variable, taking the angle corresponding to the non-minimum tensile strain as a second dependent variable, and obtaining a calculated angle according to a second function formula;
s223: and compensating the difference between the calculated angle and the actual angle as a second correction coefficient into a second strain amount of a second function formula to obtain a second formula.
It can be understood that the second function formula with the highest fitting degree is obtained by fitting the second corresponding relation with a plurality of function formulas, so that the detection device can rapidly obtain the direction of the fluid by using the first strain gauge 41 and the second function formula on the first annular film 3, further high-efficiency detection of the fluid direction by the detection device is ensured, and the second correction coefficient is compensated into the second function formula and the second formula is obtained by test correction, so that the detection device can accurately obtain the direction of the fluid by using the first strain gauge 41 and the second formula on the first annular film 3, and further accurate detection of the fluid direction by the detection device is ensured.
It should be noted that, the fitting of the second correspondence relationship and the function formula may be set according to actual needs, which is not limited, and the following table is illustrated by way of example:
/>
the fitting degree of the second corresponding relation and the primary function is 0.39, the fitting degree of the second corresponding relation and the secondary function is 0.88, the fitting degree of the second corresponding relation and the Fourier function is 0.99, and the fitting degree of the second corresponding relation and the trigonometric function is 0.97. It can be seen that the fitting degree of the second correspondence relation to the fourier function is highest, so that the fourier function is utilized in combination with the second correction coefficient as the second formula, and the second correction coefficient can be obtained through experiments.
In some embodiments, the second formula is γ 2 Eε 1 epsilon=c-Dcos (Fx) -Gsin (Hx); wherein, gamma 2 Is a second correction factor, E is the modulus of elasticity of the first annular film 3, ε is the minimum tensile strain, ε, of the first annular film 3 1 Is a non-minimum tensile strain adjacent to ε, and x is ε 1 The corresponding angle, C, is the third coefficient, D is the fourth coefficient, F is the fifth coefficient, G is the sixth coefficient, and H is the seventh coefficient.
It will be appreciated that when the detection device is placed in an actual fluid field, since the minimum tensile strain of the first annular membrane 3 can be obtained by the first strain gauge 41, and the non-minimum tensile strain adjacent to the minimum tensile strain can also be obtained by the first strain gauge 41, the elastic modulus of the first annular membrane 3 is also determined after the material of the first annular membrane 3 is determined, and thus the minimum tensile strain of the first annular membrane 3, the non-minimum tensile strain adjacent to the minimum tensile strain, the elastic modulus of the first annular membrane 3, and the first formula can be used to quickly and accurately obtain the direction of the fluid, thereby ensuring efficient and accurate detection of the direction of the fluid by the detection device.
It should be noted that the specific values of the third coefficient C, the fourth coefficient D, the fifth coefficient F, the sixth coefficient G and the seventh coefficient H may be calculated according to the application scenario, which is not limited thereto, and the third coefficient C, the fourth coefficient D, the fifth coefficient F, the sixth coefficient G and the seventh coefficient H may be represented by the resistance coefficient C D Deriving that the third coefficient C can be-4.34, the fourth coefficient D can be 16, the fifth coefficient F can be 0.036, the sixth coefficient G can be 0.55, and the seventh coefficient H can be 0.036, i.e., the second formula is gamma 2 Eε 1 /ε＝-4.34-16cos(0.036x)-0.55sin(0.036x)。
The following are examples of the application of the detection device:
the fluid was set as wind, the wind speed of the wind field was set to 10m/s, the material of the first annular film 3 was set to steel, the elastic modulus was 206000000000Pa, the detection device of the present embodiment was placed in the wind field, the minimum tensile strain of the first annular film 3 was measured as 0.0000000000233, and the non-minimum tensile strain adjacent to the minimum tensile strain was obtained as 0.00000000014679 by comparison calculation.
Substituting 0.0000000000233 into the first formula and ignoring the first correction coefficient to obtain:
V＝5.181×0.0000000000233×206000000000 0.407 ＝10；
the wind speed was thus 10m/s, which was the same as the wind speed of the wind farm set.
Substituting 0.0000000000233 and 0.00000000014679 into the second formula and ignoring the second correction coefficient yields:
E0.00000000014679/0.0000000000233＝-4.34-16cos(0.036x)-0.55sin(0.036x)；
x=123.75 was found.
And (3) taking the position of the non-minimum tensile strain as a starting point, and rotating 123.75 degrees along the direction from the minimum tensile strain to the non-minimum tensile strain to obtain the position of the windward side, thereby obtaining the wind direction.
It should be noted that in the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.
Claims (10)
1. A detection apparatus, characterized by comprising:
the device comprises a bottom plate, a top plate, a first annular film and at least five strain detection units;
wherein the first annular film is disposed between the bottom plate and the top plate, the strain detection unit includes: the first strain gauge is arranged on the first annular film, and at least five first strain gauges are uniformly distributed along the circumferential direction of the first annular film.
2. The detection apparatus according to claim 1, characterized in that the detection apparatus further comprises:
the second annular film is arranged between the bottom plate and the top plate, and is positioned at the inner side of the first annular film, and a first deformation space is arranged between the second annular film and the first annular film;
and a second strain gauge disposed on the second annular film.
3. The detection apparatus according to claim 2, wherein the strain detection unit further comprises:
a strain detection circuit, the strain detection circuit comprising: the first end of the first resistor is connected with the positive electrode of the power supply, the second end of the first resistor is connected with the first end of the second strain gauge, the second end of the second strain gauge is connected with the negative electrode of the power supply, the first end of the second resistor is connected with the first end of the first resistor, the second end of the second resistor is connected with the first end of the first strain gauge, and the second end of the first strain gauge is connected with the second end of the second strain gauge.
4. The detection apparatus according to claim 2, characterized in that the detection apparatus further comprises:
the telescopic assembly is arranged on the bottom plate, the top plate is arranged at one end of the telescopic assembly away from the bottom plate, the telescopic assembly is positioned at the inner side of the second annular film, and a second deformation space is arranged between the telescopic assembly and the second annular film.
5. The detecting device according to claim 2, wherein,
The side of the top plate, which is close to the bottom plate, and the side of the bottom plate, which is close to the top plate, are respectively provided with a first annular groove and a second annular groove, the second annular groove is positioned on the inner side of the first annular groove, one end of the first annular film is arranged in the first annular groove through a first filling medium, and one end of the second annular film is arranged in the second annular groove through a second filling medium.
6. The detection apparatus according to any one of claims 1 to 5, wherein the at least five strain detection units include:
eight strain detection units, eight first strain gauges along circumference evenly distributed of first annular film the inboard of first annular film.
7. A flow rate detection method, characterized by being applied to the detection apparatus as claimed in any one of claims 1 to 6, the method comprising:
obtaining the minimum tensile strain of the first annular film at different flow rates, and obtaining a first corresponding relation between the flow rate and the minimum tensile strain;
fitting a first formula according to the first corresponding relation;
and placing the detection device in an actual fluid field, acquiring the minimum tensile strain of the first annular film through at least five first strain sheets, and acquiring the flow rate of the actual fluid field according to the first formula.
8. The method of claim 7, wherein fitting a first formula according to the first correspondence comprises:
fitting the first corresponding relation with a plurality of function formulas, and obtaining a first function formula with highest fitting degree with the first corresponding relation, wherein the first function formula comprises: a first argument, a second argument, and a first argument;
taking the minimum tensile strain of the first annular thin film as the first independent variable, taking the elastic modulus of the first annular thin film as the second independent variable, taking the flow rate as the first dependent variable, and obtaining a calculated flow rate according to the first function formula;
compensating the difference between the calculated flow rate and the actual flow rate into a first stress variable of the first function formula as a first correction coefficient to obtain the first formula;
wherein, the first formula is:
γ 1 V＝AεE B ；
the V is the flow rate, the gamma 1 Is a first correction factor, said ε being said first annular filmAnd (B) is a second coefficient, wherein E is the elastic modulus of the first annular film, a is a first coefficient, and B is a second coefficient.
9. A flow direction detection method, characterized by being applied to the detection apparatus as claimed in any one of claims 1 to 6, the method comprising:
Establishing a tensile strain coordinate along the circumferential direction of the first annular film by taking the minimum tensile strain of the first annular film as a basic strain value, and establishing an angle coordinate along the circumferential direction of the first annular film by taking the angle of the positive pair fluid surface of the first annular film as a basic angle value, so as to obtain a second corresponding relation between the tensile strain coordinate and the angle coordinate;
fitting a second formula according to the second corresponding relation;
placing the detection device in an actual fluid field, acquiring non-minimum tensile strain adjacent to the minimum tensile strain of the first annular film through at least five first strain sheets, and acquiring an angle corresponding to the non-minimum tensile strain according to the second formula;
and obtaining the angle of the positive fluid surface of the first annular film according to the angle corresponding to the non-minimum tensile strain so as to obtain the flow direction of the actual fluid field.
10. The flow direction detection method according to claim 9, wherein said fitting a second formula according to the second correspondence relation comprises:
fitting the second corresponding relation with a plurality of function formulas, and obtaining a second function formula with highest fitting degree with the second corresponding relation, wherein the second function formula comprises: a third independent variable, a fourth independent variable, a fifth independent variable and a second dependent variable;
Taking the minimum tensile strain of the first annular thin film as the first independent variable, taking the non-minimum tensile strain adjacent to the minimum tensile strain as the second independent variable, taking the elastic modulus of the first annular thin film as the third independent variable, taking the angle corresponding to the non-minimum tensile strain as the second dependent variable, and obtaining a calculated angle according to the second function formula;
compensating the difference between the calculated angle and the actual angle as a second correction coefficient into a second strain amount of the second function formula to obtain the second formula;
wherein the second formula is:
γ 2 Eε 1 /ε＝C-Dcos(Fx)-Gsin(Hx)；
the gamma is 2 Is a second correction factor, said E is the elastic modulus of said first annular film, said ε is the minimum tensile strain of said first annular film, said ε 1 Is a non-minimum tensile strain adjacent to said ε, and said x is said ε 1 Corresponding angles, C is the third coefficient, D is the fourth coefficient, F is the fifth coefficient, G is the sixth coefficient, and H is the seventh coefficient.
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| CN110146724A (en) * | 2019-06-17 | 2019-08-20 | 中国华能集团有限公司 | A kind of wind direction detection device and method |
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| CN110927824A (en) * | 2019-12-12 | 2020-03-27 | 石家庄铁道大学 | Wind speed and direction testing device and testing method |
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| US20140260596A1 (en) * | 2013-03-12 | 2014-09-18 | Subsidence, Inc. | Mechanical strain-based weather sensor |
| RU2013158766A (en) * | 2013-12-30 | 2014-05-10 | Общество с ограниченной ответственностью "СПИНТЕК" | ANEMOMETER |
| CN110146724A (en) * | 2019-06-17 | 2019-08-20 | 中国华能集团有限公司 | A kind of wind direction detection device and method |
| CN110346073A (en) * | 2019-07-08 | 2019-10-18 | 西安西电电气研究院有限责任公司 | Pressure between layers measuring device and method based on metallization film capacitor |
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