CN115655641B - High-precision loading force application device and method for wind tunnel balance calibration - Google Patents
High-precision loading force application device and method for wind tunnel balance calibration Download PDFInfo
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- CN115655641B CN115655641B CN202211393160.8A CN202211393160A CN115655641B CN 115655641 B CN115655641 B CN 115655641B CN 202211393160 A CN202211393160 A CN 202211393160A CN 115655641 B CN115655641 B CN 115655641B
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- tunnel balance
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- 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
Abstract
The invention discloses a high-precision loading force application device and method for wind tunnel balance calibration, belongs to the technical field of aerospace aerodynamic force tests, and aims to solve the problem that inertial force is generated when weights are added on weight plates for calibrating wind tunnel days, and balance calibration accuracy is affected. The damping force monitoring device comprises a tray connecting rod, a damping force monitoring device, a cross damper and a damping oil groove; the cross damper comprises two damping plates which are connected in a crossed manner, the end faces of the two damping plates are perpendicular, the damping force monitoring device comprises force measuring elements which are respectively arranged in a one-to-one correspondence and in the same direction with the two damping plates, the upper end of the tray connecting rod is hung on the measuring rudder through a steel wire, the lower end of the tray connecting rod is sequentially connected with the damping force monitoring device and the cross damper, and the cross damper extends into damping medium oil.
Description
Technical Field
The invention belongs to the technical field of aerospace aerodynamic force tests, and particularly relates to a high-precision loading force application device and method for wind tunnel balance calibration.
Background
Wind tunnel balances are used to measure aerodynamic loads acting on aircraft in wind tunnel tests. The working principle can be divided into a mechanical balance, an optical fiber balance, a piezoelectric balance and the like. At present, a strain balance is commonly used, a strain gauge is stuck on a sensitive element by adopting a strain electrical measurement principle, and an electric bridge is formed, so that the strain of the loaded deformation of a material body is converted into an electric signal for measurement. And establishing a mapping relation between the load and the electric signal through pre-calibration. In use, aerodynamic load of the aircraft can be calculated according to the relation obtained during the measurement of the electric signals and the calibration.
The wind tunnel balance is calibrated and calibrated, and the relationship coefficient between the output load and the voltage is obtained, so that the method is one of key steps for developing the wind tunnel balance. The current common wind tunnel balance calibration method is to install a wind tunnel balance on a special calibration frame, install a special loading head on the balance, apply a preset load to a loading point on the loading head through a force application mechanism, so as to realize the application of the balance calibration load, record the load value of the balance and the output signal of the balance, and calculate the relation coefficient of the load and the signal through a mathematical method. Therefore, the accuracy of load application during calibration directly determines the accuracy of the balance of the wind tunnel. The manual weight type force application loading mode has the characteristics of high precision, good reliability, low cost, convenient maintenance and the like, is widely used in wind tunnel balance calibration, and is a preferred loading mode for balance calibration with medium and small loads. The problem that this kind of mode exists is can lead to the weight dish to rock when adding the weight on the weight dish, and load loading system produces inertial force, influences the precision of calibration.
Disclosure of Invention
The invention aims to provide a high-precision loading force application device for wind tunnel balance calibration, which aims to solve the problem that when a wind tunnel balance is calibrated, the weight is added to a weight disc to cause the weight disc to shake, and the loading force application device generates inertial force to influence the wind tunnel balance calibration precision. The technical scheme adopted by the invention is as follows:
a high-precision loading force application device for wind tunnel balance calibration comprises a tray connecting rod, a weight tray, a damping force monitoring device, a cross damper and a damping oil groove;
the cross damper comprises two damping plates which are vertically arranged, the two damping plates are connected in a crossed manner, the end faces of the two damping plates are vertical, and the gravity center lines of the two damping plates are coincident;
the damping force monitoring device comprises an upper connecting part, a first direction force measuring element, a middle connecting part, a second direction force measuring element and a lower connecting part which are sequentially connected from top to bottom, wherein the first direction force measuring element and the second direction force measuring element are all flat plate-shaped metal members which are vertically arranged, two strain gauges are respectively stuck on the end surfaces of two sides of the first direction force measuring element, and an electric bridge is formed and is defined as U 1 Two strain gauges are respectively stuck on the end surfaces of the two sides of the second direction force measuring element to form an electric bridge, and the electric bridge is defined as U 2 ；
The weight tray is arranged on the tray connecting rod, the upper end of the tray connecting rod is connected with the steel wire, the lower end of the tray connecting rod is connected with the upper connecting part, the lower connecting part is connected with the cross damper, damping medium oil is arranged in the damping oil groove, the cross damper extends into the damping medium oil, the end faces of the first direction force measuring element and the second direction force measuring element are respectively arranged in the same direction with the end faces of the two damping plates in a one-to-one correspondence manner, and the weight center lines of the tray connecting rod, the upper connecting part, the first direction force measuring element, the middle connecting part, the second direction force measuring element and the lower connecting part are all overlapped with the gravity center line of the cross damper.
The damping medium oil is engine oil.
The damping plate is a rectangular plate.
The tray connecting rod is provided with a limit nut, the upper end of the tray connecting rod penetrates through the weight tray, and the weight tray is supported by the limit nut.
The weight tray is a circular plate, and the tray connecting rod penetrates through the axis of the weight tray.
The upper connecting part, the middle connecting part and the lower connecting part are metal cylinders with equal diameters.
The first direction force measuring element is a metal plate with the width of 5mm and the thickness of 1 mm.
The second direction force measuring element is a metal plate with the width of 5mm and the thickness of 1 mm.
The damping force monitoring device is an integrally formed component.
The invention also provides a high-precision loading and force application method for wind tunnel balance calibration, which is completed by adopting the high-precision loading and force application device for wind tunnel balance calibration, and comprises the following steps:
step 1: to U 1 And U 2 Respectively supplying power, wherein the power supply voltage is 5V;
step 2: adding standard weights on the weight tray according to the load requirement of the calibration wind tunnel balance;
step 3: when U is 1 And U 2 When the output voltages of the wind tunnel balance are within 1 mu v, the inertia force of the loading force application device is judged to be zero, the loading force application device is in a stable state, and the wind tunnel balance can be used for collecting hinge moment strain electric signals.
Compared with the prior art, the invention has the beneficial effects that:
the invention effectively eliminates errors caused by weight shaking when a wind tunnel balance is loaded through the cross damper and the damping force monitoring device, realizes quick, efficient and high-precision balance calibration force application loading, effectively judges the stable state of a system, reduces human observation errors and further improves the accuracy of loading force application.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a schematic structural view of a damping force monitoring device;
FIG. 4 is a front view of a damping force monitoring device;
FIG. 5 is a left side view of the damping force monitoring device;
FIG. 6 is a schematic structural view of a cross damper;
FIG. 7 is a diagram of an arrangement of strain gauges in a left-hand view of a damping force monitoring device;
FIG. 8 is a diagram showing an arrangement of strain gauges in a front view of a damping force monitoring device;
FIG. 9 is U 1 A bridge diagram;
FIG. 10 is U 2 And (5) bridge diagram.
In the figure: 1-steel wire, 2-tray connecting rod, 3-weight tray, 4-damping force monitoring device, 41-upper connecting portion, 42-first direction force measuring element, 43-intermediate connecting portion, 44-second direction force measuring element, 45-lower connecting portion, 5-cross damper, 51-damping plate, 6-damping oil groove, 7-limit nut, 81-first strain gauge, 82-second strain gauge, 83-third strain gauge, 84-fourth strain gauge, 85-fifth strain gauge, 86-sixth strain gauge, 87-seventh strain gauge, 88-eighth strain gauge.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The connection mentioned in the invention is divided into fixed connection and detachable connection, wherein the fixed connection is a conventional fixed connection mode such as folding connection, rivet connection, bonding connection, welding connection and the like, the detachable connection comprises a conventional detachable mode such as bolt connection, buckle connection, pin connection, hinge connection and the like, and when a specific connection mode is not limited, at least one connection mode can be found in the conventional connection mode by default to realize the function, and the person skilled in the art can select the function according to the needs. For example: the fixed connection is welded connection, and the detachable connection is bolted connection.
The present invention will be described in further detail below with reference to the accompanying drawings, the following examples being illustrative of the present invention and the present invention is not limited to the following examples.
Example 1: as shown in fig. 1-6, a high-precision loading force application device for wind tunnel balance calibration comprises a tray connecting rod 2, a weight tray 3, a damping force monitoring device 4, a cross damper 5 and a damping oil groove 6;
the cross damper 5 comprises two damping plates 51 which are vertically arranged, the two damping plates 51 are connected in a crossed manner, the end faces of the two damping plates 51 are vertical, the heavy axes of the two damping plates 51 are overlapped, and the thicknesses of the damping plates 51 are equal, so that the gravity center line of the damping plates 51 is also a vertical axis;
the damping force monitoring device 4 comprises an upper connecting part 41, a first direction force measuring element 42, a middle connecting part 43, a second direction force measuring element 44 and a lower connecting part 45 which are sequentially connected from top to bottom, wherein the first direction force measuring element 42 and the second direction force measuring element 44 are respectively flat plate-shaped metal members which are vertically arranged, two strain gauges are respectively stuck on the end surfaces of two sides of the first direction force measuring element 42, and a bridge is formed, and is defined as U 1 At both side ends of the second direction force measuring cell 44Two strain gauges are respectively stuck on the surface and form an electric bridge, and the electric bridge is defined as U 2 ；
The weight tray 3 is arranged on the tray connecting rod 2, the upper end of the tray connecting rod 2 is connected with the steel wire 1, the upper end of the steel wire 1 penetrates through a loading hole of the measuring rudder and is connected with a loading head, the loading head vertically abuts against the measuring rudder, the steel wire 1 is hoisted on the measuring rudder through the loading head, the lower end of the tray connecting rod 2 is connected with the upper connecting portion 41, the lower connecting portion 45 is connected with the cross damper 5, damping medium oil is arranged in the damping oil groove 6, the cross damper 5 extends into the damping medium oil, the end faces of the first direction force measuring element 42 and the second direction force measuring element 44 are respectively arranged in the same direction with the end faces of the two damping plates 51 in a one-to-one correspondence mode, and the weight axes of the tray connecting rod 2, the upper connecting portion 41, the first direction force measuring element 42, the middle connecting portion 43, the second direction force measuring element 44 and the lower connecting portion 45 are all coincident with the gravity center line of the cross damper 5.
The damping medium oil is engine oil.
The damper plate 51 is a rectangular plate.
The tray connecting rod 2 is provided with a limit nut 7, the upper end of the tray connecting rod 2 penetrates through the weight tray 3, and the weight tray 3 is supported by the limit nut 7.
The weight tray 3 is a circular plate, and the tray connecting rod 2 passes through the axle center of the weight tray 3.
The upper connecting portion 41, the intermediate connecting portion 43 and the lower connecting portion 45 are metal cylinders having equal diameters.
The first direction force cell 42 is a metal plate having a width of 5mm and a thickness of 1 mm.
The second direction force measuring cell 44 is a metal plate having a width of 5mm and a thickness of 1 mm.
The damping force monitoring device 4 is an integrally formed member.
The device comprises a steel wire 1, a tray connecting rod 2, a weight tray 3, a damping force monitoring device 4, a damping medium oil, a cross damper 5, a balance calibration force application load, a system stable state judgment, a man-made observation error reduction, and further an accuracy of loading force application.
Example 2: as shown in fig. 7-10, the present invention further provides a high-precision loading and force application method for wind tunnel balance calibration, which is completed by adopting the high-precision loading and force application device for wind tunnel balance calibration, and comprises the following steps:
step 1: a first strain gauge 81 and a second strain gauge 82 are adhered up and down on the front side end surface of the first direction force measuring element 42, a third strain gauge 83 and a fourth strain gauge 84 are adhered up and down on the rear side end surface of the first direction force measuring element 42, and the first strain gauge 81, the second strain gauge 82, the third strain gauge 83 and the fourth strain gauge 84 form a U 1 An electric bridge; a fifth strain gauge 85 and a sixth strain gauge 86 are stuck up and down on the left end face of the second direction force measuring element 44, a seventh strain gauge 87 and an eighth strain gauge 88 are stuck up and down on the right end face of the second direction force measuring element 44, and the fifth strain gauge 85, the sixth strain gauge 86, the seventh strain gauge 87 and the eighth strain gauge 88 form U 2 An electric bridge;
step 2: to U 1 And U 2 Respectively supplying power, wherein the power supply voltage is 5V;
step 3: adding standard weights on the weight tray 3 according to the load requirement of the calibration wind tunnel balance;
step 4: when U is 1 And U 2 When the output voltages of the wind tunnel balance are within 1 mu v, the inertia force of the loading force application device is judged to be zero, the loading force application device is in a stable state, and the wind tunnel balance can be used for collecting hinge moment strain electric signals.
The above embodiments are only illustrative of the present patent and do not limit the protection scope thereof, and those skilled in the art can also change the parts thereof, which are within the protection scope of the present patent without exceeding the spirit of the present patent.
Claims (10)
1. A high accuracy loading force application device for wind-tunnel balance calibration, its characterized in that: the damping device comprises a tray connecting rod (2), a weight tray (3), a damping force monitoring device (4), a cross damper (5) and a damping oil groove (6);
the cross damper (5) comprises two damping plates (51) which are vertically arranged, the two damping plates (51) are connected in a crossed manner, the end faces of the two damping plates (51) are vertical, and the gravity center lines of the two damping plates (51) are coincident;
the damping force monitoring device (4) comprises an upper connecting part (41), a first direction force measuring element (42), a middle connecting part (43), a second direction force measuring element (44) and a lower connecting part (45) which are sequentially connected from top to bottom, wherein the first direction force measuring element (42) and the second direction force measuring element (44) are all vertically arranged flat metal members, two strain gauges are respectively stuck on two side end surfaces of the first direction force measuring element (42), and a bridge is formed, and is defined as U 1 Two strain gauges are respectively stuck on the two side end surfaces of the second direction force measuring element (44) to form a bridge, and the bridge is defined as U 2 ；
Be equipped with weight tray (3) on tray connecting rod (2), the upper end of tray connecting rod (2) links to each other with steel wire (1), and the lower extreme of tray connecting rod (2) links to each other with last connecting portion (41), and lower connecting portion (45) link to each other with cross attenuator (5), are equipped with damping medium oil in damping oil groove (6), cross attenuator (5) extend to in the damping medium oil, the terminal surface of first direction dynamometry element (42) and second direction dynamometry element (44) set up with the terminal surface one-to-one of two damping plates (51) respectively, tray connecting rod (2), upper connecting portion (41), first direction dynamometry element (42), intermediate connecting portion (43), the barycenter line of second direction dynamometry element (44) and lower connecting portion (45) all coincides with the barycenter line of cross attenuator (5).
2. A high precision loading force application device for wind tunnel balance calibration according to claim 1, wherein: the damping medium oil is engine oil.
3. A high precision loading force application device for wind tunnel balance calibration according to claim 1, wherein: the damping plate (51) is a rectangular plate.
4. A high precision loading force application device for wind tunnel balance calibration according to claim 1, wherein: the tray connecting rod (2) is provided with a limit nut (7), the upper end of the tray connecting rod (2) penetrates through the weight tray (3), and the weight tray (3) is supported by the limit nut (7).
5. The high precision loading force applying device for wind tunnel balance calibration according to claim 4, wherein: the weight tray (3) is a circular plate, and the tray connecting rod (2) passes through the axle center of the weight tray (3).
6. A high precision loading force application device for wind tunnel balance calibration according to claim 1, wherein: the upper connecting part (41), the middle connecting part (43) and the lower connecting part (45) are metal cylinders with equal diameters.
7. A high precision loading force application device for wind tunnel balance calibration according to claim 1, wherein: the first direction force measuring element (42) is a metal plate with a width of 5mm and a thickness of 1 mm.
8. A high precision loading force application device for wind tunnel balance calibration according to claim 1, wherein: the second direction force measuring element (44) is a metal plate with the width of 5mm and the thickness of 1 mm.
9. A high precision loading force device for wind tunnel balance calibration according to any one of claims 6-8, wherein: the damping force monitoring device (4) is an integrally formed component.
10. A high-precision loading and force application method for wind tunnel balance calibration, which is completed by adopting the high-precision loading and force application device for wind tunnel balance calibration according to any one of claims 1-9, and is characterized by comprising the following steps:
step 1: to U 1 And U 2 Respectively supplying power, wherein the power supply voltage is 5V;
step 2: adding standard weights on the weight tray (3) according to the load requirement of the calibration wind tunnel balance;
step 3: when U is 1 And U 2 When the output voltages of the wind tunnel balance are within 1 mu v, the inertia force of the loading force application device is judged to be zero, the loading force application device is in a stable state, and the wind tunnel balance can be used for collecting hinge moment strain electric signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211393160.8A CN115655641B (en) | 2022-11-08 | 2022-11-08 | High-precision loading force application device and method for wind tunnel balance calibration |
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| CN202211393160.8A CN115655641B (en) | 2022-11-08 | 2022-11-08 | High-precision loading force application device and method for wind tunnel balance calibration |
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| CN115655641B true CN115655641B (en) | 2023-08-11 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116608989A (en) * | 2023-07-18 | 2023-08-18 | 中国航空工业集团公司沈阳空气动力研究所 | Three-component hinge moment balance calibration device and method |
| CN117073970B (en) * | 2023-10-16 | 2024-01-23 | 中国空气动力研究与发展中心高速空气动力研究所 | Load holding, vibration suppressing and fast stabilizing method for large mass loading head |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4074567A (en) * | 1977-05-06 | 1978-02-21 | The United States Of America As Represented By The Secretary Of The Navy | Low interaction wind tunnel balance |
| CN103674472A (en) * | 2013-12-25 | 2014-03-26 | 中国航空工业集团公司沈阳空气动力研究所 | Automatic three-level weight loading device and loading method for wind tunnel balance calibration |
| CN108896269A (en) * | 2018-03-29 | 2018-11-27 | 中国航天空气动力技术研究院 | A kind of high-precision axial force measuration wind-tunnel balance |
| CN112254924A (en) * | 2020-11-03 | 2021-01-22 | 长安大学 | Continuously adjustable wind tunnel experiment linear damping device |
| CN113740026A (en) * | 2021-08-20 | 2021-12-03 | 中国航天空气动力技术研究院 | Novel wind tunnel balance loading sleeve and wind tunnel balance calibration method |
| CN216899543U (en) * | 2021-12-15 | 2022-07-05 | 西安现代控制技术研究所 | Loading device for accurately adjusting roll angle of wind tunnel rod type force measuring balance |
-
2022
- 2022-11-08 CN CN202211393160.8A patent/CN115655641B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4074567A (en) * | 1977-05-06 | 1978-02-21 | The United States Of America As Represented By The Secretary Of The Navy | Low interaction wind tunnel balance |
| CN103674472A (en) * | 2013-12-25 | 2014-03-26 | 中国航空工业集团公司沈阳空气动力研究所 | Automatic three-level weight loading device and loading method for wind tunnel balance calibration |
| CN108896269A (en) * | 2018-03-29 | 2018-11-27 | 中国航天空气动力技术研究院 | A kind of high-precision axial force measuration wind-tunnel balance |
| CN112254924A (en) * | 2020-11-03 | 2021-01-22 | 长安大学 | Continuously adjustable wind tunnel experiment linear damping device |
| CN113740026A (en) * | 2021-08-20 | 2021-12-03 | 中国航天空气动力技术研究院 | Novel wind tunnel balance loading sleeve and wind tunnel balance calibration method |
| CN216899543U (en) * | 2021-12-15 | 2022-07-05 | 西安现代控制技术研究所 | Loading device for accurately adjusting roll angle of wind tunnel rod type force measuring balance |
Non-Patent Citations (1)
| Title |
|---|
| 一种单矢量风洞天平校准系统设计;湛华海等;实验流体力学;第28卷(第01期);70-74 * |
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