A six-component rod balance variable temperature calibration loading device and calibration correction method

Abstract

A six-component rod-type balance variable temperature calibration loading device and calibration correction method, belonging to the field of aerodynamic test technology, the present invention is to solve the problem of poor accuracy of loading results of wind tunnel balance in a continuous high temperature environment. The device includes a loading head, the loading head is a cylindrical component, the outer periphery of the calibration cone sleeve is matched with the inner periphery of the loading head, the wind tunnel balance is connected to the calibration cone sleeve, the heat-conducting sleeve is sleeved on the outer periphery of the wind tunnel balance, the inner periphery of the loading head is provided with a heat-insulating bushing, the heat-conducting sleeve is wound with an electromagnetic coil, the heat-insulating cover plate seals the heat-conducting sleeve in the loading head, the calibration support rod passes through the heat-insulating cover plate and is connected to the right end of the wind tunnel balance, the wind tunnel balance is provided with a balance body temperature sensor, the loading head is provided with an infrared temperature measuring device, and the measuring head of the infrared temperature measuring device faces the electromagnetic coil. The present invention corrects the change of the force arm of the loading point through the relationship between the thermal expansion of the loading head and the temperature, which can effectively improve the accuracy of the loading results of the wind tunnel balance under high temperature conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of aerodynamic test, and in particular relates to a six-component rod-type balance variable temperature calibration loading device and a calibration correction method. Background Art

[0002] When conducting hypersonic wind tunnel force measurement tests at high Mach numbers, the total temperature of the wind tunnel will be relatively high due to the characteristics of the wind tunnel. At the same time, in some special tests, the ambient and model temperatures need to reach relatively high temperatures. Current data show that the temperature can usually reach around 700K-800K. Under such environmental conditions, the balance will be affected by thermal radiation and heat conduction, causing the balance temperature to continue to rise; usually the balance is calibrated at room temperature, and the balance formula calibrated at room temperature cannot meet the test temperature conditions. At different temperatures, the output of the balance will produce large errors, which will affect the accuracy of the force measurement test and directly affect the accuracy of the wind tunnel test data.

[0003] In order to ensure the force measurement accuracy of the balance, some technical means need to be adopted. The most common method is to insulate the balance to ensure that the working temperature of the balance is close to room temperature. This method can only meet part of the test requirements; when facing tests under continuous high temperature conditions, the temperature of the balance cannot be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to provide a six-component rod balance variable temperature calibration loading device and calibration correction method to solve the problem that the thermal insulation cannot keep the wind tunnel balance at a normal temperature in a continuous high temperature environment, resulting in poor accuracy of the loading results. The technical solution adopted by the present invention is as follows:

[0005] A six-component rod-type balance variable temperature calibration loading device, comprising a loading head, the loading head is a cylindrical component, the X-axis of the spatial coordinate system is set to the left, the Y-axis is set to the top, and the Z-axis is set to the back, the loading head is coaxial with the X-axis of the spatial coordinate system, a left connecting ring is provided at the left end of the loading head, a G4 pull rod is connected to the lower side of the left connecting ring through a force transmission and interference elimination component, a G2 pull rod is connected to the upper side of the left connecting ring through a force transmission and interference elimination component, an M1 target point is provided on the upper side of the left connecting ring, a right connecting ring is provided at the right end of the loading head, a G6 pull rod is connected to the The lower side of the right connecting ring is connected, the G3 pull rod is connected to the upper side of the right connecting ring through a force transmission and interference elimination piece, the upper side of the right connecting ring is provided with an M2 target point, the middle part of the loading head is provided with a middle connecting ring, the G5 pull rod is connected to the lower side of the middle connecting ring through a force transmission and interference elimination piece, the G1 pull rod is connected to the upper side of the middle connecting ring through a force transmission and interference elimination piece, a loading device surface temperature sensor is provided on the middle connecting ring, a front loading arm extends forward from the front side of the middle connecting ring, a rear loading arm extends backward from the rear side of the middle connecting ring, and the G7 pull rod is connected to the The front end of the front loading arm is connected to the left side, the G8 pull rod is connected to the right side of the front end of the front loading arm through the force transmission and interference elimination member, the G12 pull rod is connected to the lower side of the front end of the front loading arm through the force transmission and interference elimination member, the G13 pull rod is connected to the front side of the front end of the front loading arm through the force transmission and interference elimination member, the G9 pull rod is connected to the left side of the rear end of the rear loading arm through the force transmission and interference elimination member, the G10 pull rod is connected to the right side of the rear end of the rear loading arm through the force transmission and interference elimination member, the G11 pull rod is connected to the lower side of the rear end of the rear loading arm through the force transmission and interference elimination member, and the G14 pull rod is connected to the front side of the front end of the front loading arm through the force transmission and interference elimination member. The disruptor is connected to the rear side of the rear end of the rear loading arm, an M3 target point is arranged on the upper side of the front end of the front loading arm, an M4 target point is arranged on the upper side of the rear end of the rear loading arm, a G2 pull rod, a G3 pull rod, a G4 pull rod, a G6 pull rod, a G11 pull rod and a G12 pull rod are all arranged parallel to the Y axis of the spatial coordinate system, a G1 pull rod and a G5 pull rod are arranged coincident with the Y axis of the spatial coordinate system, a G7 pull rod, a G8 pull rod, a G9 pull rod and a G10 pull rod are all arranged parallel to the X axis of the spatial coordinate system, and a G13 pull rod and a G14 pull rod are all arranged coincident with the Z axis of the spatial coordinate system;

[0006] The outer circumference of the calibration cone sleeve cooperates with the inner circumference of the loading head, the left end of the wind tunnel balance is connected to the calibration cone sleeve, the heat-conducting sleeve is sleeved on the outer circumference of the wind tunnel balance, the left end of the heat-conducting sleeve is connected to the calibration cone sleeve, the inner circumference of the loading head is provided with a heat-insulating bushing, the outer circumference of the heat-conducting sleeve is surrounded by an electromagnetic coil, the right end of the loading head is provided with a heat-insulating cover plate, the heat-insulating cover plate seals the heat-conducting sleeve in the loading head, so that a heating chamber is formed inside the loading head between the calibration cone sleeve and the heat-insulating cover plate, the left end of the calibration support rod passes through the heat-insulating cover plate, and extends into the heat-conducting sleeve, and is connected to the right end of the wind tunnel balance, and working gaps are provided between the heat-conducting sleeve and the wind tunnel balance and the calibration support rod, a balance body temperature sensor is provided on the wind tunnel balance, an infrared temperature measuring device is provided on the loading head, and the measuring head of the infrared temperature measuring device faces the electromagnetic coil.

[0007] Furthermore, the electromagnetic coil is slidably matched with the heat-conducting sleeve, and the electromagnetic coil is detachably connected to the calibration support rod through a fixer.

[0008] Furthermore, the heat insulating bushing is an aerogel felt or asbestos component, and the heat insulating bushing is pasted on the inner wall of the loading head.

[0009] The present invention also provides a six-component rod-type balance variable temperature calibration correction method, which is implemented based on the above-mentioned six-component rod-type balance variable temperature calibration loading device, and includes the following steps:

[0010] Step 1: During the assembly process of the loading device, the calibration posture of the wind tunnel balance is adjusted, the axial position of the electromagnetic coil is adjusted, and the calibration posture of the loading head is adjusted;

[0011] Step 2: Apply axial tension F to the other ends of G1, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, G12, G13 and G14 rods respectively, and mark them as F in turn. G1 、F G2 、F G3 、F G4 、F G5 、F G6 、F G7 、F G8 、F G9 、F G10 、F G11 、F G12 、F G13 and F G14 , then the six-element load expression of the wind tunnel balance is as follows:

[0012] Normal force: Y=F G1 +F G2 +F G3 -F G4 -F G5 -FG6 ;

[0013] Axial force: X=F G8 +F G10 -F G7 -F G9 ;

[0014] Lateral force: Z=F G14 -F G13 ;

[0015] Rolling moment: Mx = (F G11 -F G12 )×L Mx ;

[0016] Yaw moment: My = (F G8 +F G9 -F G7 -F G10 )×L Mx ;

[0017] Pitch moment: Mz = (F G2 +F G6 -F G3 -F G4 )×L Mz ;

[0018] Among them, L Mx F G11 The arm of force is the distance from the axis of the G11 tie rod to the XY plane of the spatial coordinate system; L Mz F G2 The moment arm is the distance from the axis of the G2 pull rod to the YZ plane of the spatial coordinate system;

[0019] Step 3: Under normal temperature, use the laser tracker to locate the M1 target, M2 target, M3 target and M4 target respectively, and mark the X value of the M1 target as X. 10 , mark the X value of the M2 target as X 20 , mark the Z value of the M3 target as Z 30 , mark the Z value of the M4 target as Z 40 ;

[0020] Step 4: Heat the calibration support rod and the heat-conducting sleeve through the electromagnetic coil, and set the maximum target temperature of the wind tunnel balance to , the temperature of the electromagnetic coil is raised from room temperature T0 to T1, T2 and , where T1=1 / 3T 目标 , T2=2 / 3T 目标 The temperature of the electromagnetic coil is monitored by the balance body temperature sensor. When the temperature of the electromagnetic coil is stable at T1, the X value of the target point M1 is recorded as X11 , record the X value of the M2 target as X 21 , record the Z value of the M3 target as Z 31 , record the Z value of the M4 target as Z 41 When the temperature of the electromagnetic coil stabilizes at T2, the X value of the target point M1 is recorded as X 12 , record the X value of the M2 target as X 22 , record the Z value of the M3 target as Z 32 , record the Z value of the M4 target as Z 42 , when the temperature of the electromagnetic coil is stable at T 目标 When the X value of the M1 target is recorded as X 13 , record the X value of the M2 target as X 23 , record the Z value of the M3 target as Z 33 , record the Z value of the M4 target as Z 43 , then when the temperature of the electromagnetic coil rises from room temperature T0 to T 目标 In the process, a total of 16 target coordinates can be obtained, and the feedback temperature of the surface temperature sensor of the loading device is defined as T ’ ;

[0021] Step 5: Coupling to obtain the curve formula of each target point coordinate changing with temperature:

[0022] Change curve of M1 target along X axis: X1=f M1 (T ’ );

[0023] Change curve of M2 target along X axis: X2=f M2 (T ’ );

[0024] Change curve of M3 target along Z axis: Z3=f M3 (T ’ );

[0025] Change curve of M4 target along Z axis: Z4=f M4 (T ’ );

[0026] The above function can characterize the displacement of target points M1, M2, M3 and M4 and the feedback temperature T of the surface temperature sensor of the loading device. ’ The corresponding relationship;

[0027] Step 6: During the actual loading calibration process, collect the feedback temperature T of the surface temperature sensor of the loading device ’ , and bring into the four curve formulas in step 5, we can get the displacements of target points M1, M2, M3, and M4. The displacement formulas are as follows:

[0028] Displacement of the M1 target along the X axis: ΔX1=f M1 (T ’ )-X 10 ;

[0029] Displacement of target point M2 along the X axis: ΔX2=f M2 (T ’ )-X 20 ;

[0030] Displacement of the M3 target along the Z axis: ΔZ3=f M3 (T ’ )-Z 30 ;

[0031] Displacement of the M4 target along the Z axis: ΔZ4=f M4 (T ’ )-Z 40 ;

[0032] Step 7: The three moment correction expressions of the wind tunnel balance are as follows:

[0033] Roll correction moment: Mx 修正 =F G11 ×(L Mx +ΔZ4)-F G12 ×(L Mx -ΔZ3);

[0034] Yaw correction moment: My 修正 =(F G8 -F G7 )×(L Mx -ΔZ3)+(F G9 -F G10 )×(L Mx +ΔZ4);

[0035] Pitch correction moment: Mz 修正 =(F G2 -F G4 )×(L Mz +ΔX1)+(F G6 -F G3 )×(L Mz -ΔX2);

[0036] Step 8: Obtain the accurate load value in real time through torque correction.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The invention provides a variable temperature calibration loading device for a six-component rod-type balance in a wind tunnel. The invention can quickly heat the wind tunnel balance while calibrating. The heating temperature of the electromagnetic coil is controlled by a control program. The heated volume of the heating chamber is relatively small, and the temperature of the wind tunnel balance body is more likely to reach equilibrium. The temperature of the wind tunnel balance is stabilized at a required temperature by controlling the electromagnetic coil to perform intermittent heating. At the same time, the surface temperature of a loading head is obtained by a surface temperature sensor of the loading device. The influence of temperature on the deformation of the loading head is obtained by measuring the displacement of a target point M1, a target point M2, a target point M3 and a target point M4. Then, loading data of the wind tunnel balance is corrected according to the influence of the deformation caused by the heating of the loading head. After the correction, more accurate loading data of the wind tunnel balance can be obtained. The device of the invention has the characteristics of small volume, small occupation of calibration space, fast heating speed, stable and controllable temperature, and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the loading device of the present invention;

[0040] Figure 2 It is a cross-sectional view of the loading device of the present invention.

[0041] Figure 3 yes Figure 2 A magnified image of point A;

[0042] Figure 4 Schematic diagram of the position and force arm of each loading point in the present invention;

[0043] Figure 5 It is a schematic diagram of the setting position of the electromagnetic coil when the heating target temperature is less than or equal to 100°C;

[0044] Figure 6 This is a schematic diagram of the setting position of the electromagnetic coil when the heating target temperature is greater than 100°C.

[0045] In the figure, 1. G1 tie rod, 2. G2 tie rod, 3. G3 tie rod, 4. G4 tie rod, 5. G5 tie rod, 6. G6 tie rod, 7. G7 tie rod, 8. G8 tie rod, 9. G9 tie rod, 10. G10 tie rod, 11. G11 tie rod, 12. G12 tie rod, 13. G13 tie rod, 14. G14 tie rod, 15. Loading head, 16. Force transmission interference elimination part, 17. M1 target, 18. M2 target, 19. M3 target, 20. M4 target, 21. Calibration support rod, 22. Fixer, 23. Loading device surface temperature sensor, 24. Calibration cone sleeve, 25. Wind tunnel balance, 26. Infrared temperature measuring device, 27. Electromagnetic coil, 28. Insulation cover, 29. Heat-conducting sleeve, 30. Thermal insulation bushing, 31. Balance body temperature sensor. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0047] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0049] Embodiment 1: Figure 1 to Figure 6As shown, a six-component rod-type balance variable temperature calibration loading device includes a loading head 15, which is a cylindrical component. The X-axis of the spatial coordinate system is set to be positive to the left, the Y-axis is positive to the top, and the Z-axis is positive to the back. The loading head 15 is coaxial with the X-axis of the spatial coordinate system. A left connecting ring is provided at the left end of the loading head 15. The G4 pull rod 4 is connected to the lower side of the left connecting ring through a force transmission and interference elimination member 16. The G2 pull rod 2 is connected to the upper side of the left connecting ring through the force transmission and interference elimination member 16. The upper side of the left connecting ring is provided with an M1 target point 17. The right end of the loading head 15 is provided with a right connecting ring. The G6 pull rod 6 is connected to the The lower side of the right connecting ring is connected, the G3 pull rod 3 is connected to the upper side of the right connecting ring through a force transmission and interference elimination member 16, the upper side of the right connecting ring is provided with an M2 target point 18, a middle connecting ring is provided in the middle of the loading head 15, the G5 pull rod 5 is connected to the lower side of the middle connecting ring through a force transmission and interference elimination member 16, the G1 pull rod 1 is connected to the upper side of the middle connecting ring through a force transmission and interference elimination member 16, a loading device surface temperature sensor 23 is provided on the middle connecting ring, a front loading arm extends forward from the front side of the middle connecting ring, a rear loading arm extends backward from the rear side of the middle connecting ring, and the G7 pull rod 7 is connected to the front loading arm through a force transmission and interference elimination member 16. The front end of the loading arm is connected to the left side, the G8 pull rod 8 is connected to the right side of the front end of the front loading arm through the force transmission and interference elimination member 16, the G12 pull rod 12 is connected to the lower side of the front end of the front loading arm through the force transmission and interference elimination member 16, the G13 pull rod 13 is connected to the front side of the front end of the front loading arm through the force transmission and interference elimination member 16, the G9 pull rod 9 is connected to the left side of the rear end of the rear loading arm through the force transmission and interference elimination member 16, the G10 pull rod 10 is connected to the right side of the rear end of the rear loading arm through the force transmission and interference elimination member 16, the G11 pull rod 11 is connected to the lower side of the rear end of the rear loading arm through the force transmission and interference elimination member 16, and the G14 pull rod 14 is connected to the front side of the front end of the front loading arm through the force transmission and interference elimination member 16 is connected to the rear side of the rear end of the rear loading arm, an M3 target point 19 is arranged on the upper side of the front end of the front loading arm, an M4 target point 20 is arranged on the upper side of the rear end of the rear loading arm, a G2 tie rod 2, a G3 tie rod 3, a G4 tie rod 4, a G6 tie rod 6, a G11 tie rod 11 and a G12 tie rod 12 are all arranged parallel to the Y axis of the spatial coordinate system, a G1 tie rod 1 and a G5 tie rod 5 are arranged coincident with the Y axis of the spatial coordinate system, a G7 tie rod 7, a G8 tie rod 8, a G9 tie rod 9 and a G10 tie rod 10 are all arranged parallel to the X axis of the spatial coordinate system, and a G13 tie rod 13 and a G14 tie rod 14 are arranged coincident with the Z axis of the spatial coordinate system;The Z values ​​of G7 rod 7, G8 rod 8, and G12 rod 12 are consistent, the Z values ​​of G9 rod 9, G10 rod 10, and G11 rod 11 are consistent, the Z values ​​of G2 rod 2, G3 rod 3, G4 rod 4, G6 rod 6, G1 rod 1, and G5 rod 5 are consistent, the Y values ​​of G7 rod 7, G13 rod 13, G8 rod 8, G9 rod 9, G14 rod 14, and G10 rod 10 are consistent, and G13 rod 1 3. The X values ​​of G12 tie rod 12, G14 tie rod 14, G1 tie rod 1, G5 tie rod 5 and G11 tie rod 11 are consistent, G2 tie rod 2 and G4 tie rod 4 are coaxial, G3 tie rod 3 and G6 tie rod 6 are coaxial, G2 tie rod 2 and G3 tie rod 3 are symmetrical about the YZ plane of the spatial coordinate system, G7 tie rod 7 and G9 tie rod 9 are symmetrical about the XY plane of the spatial coordinate system; the loading device surface temperature sensor 23 is arranged near G1 tie rod 1;

[0050] The outer periphery of the calibration cone sleeve 24 is matched with the inner periphery of the loading head 15, the left end of the wind tunnel balance 25 is connected to the calibration cone sleeve 24, the heat-conducting sleeve 29 is sleeved on the outer periphery of the wind tunnel balance 25, the left end of the heat-conducting sleeve 29 is connected to the calibration cone sleeve 24, the inner periphery of the loading head 15 is provided with a heat-insulating bushing 30, the outer periphery of the heat-conducting sleeve 29 is wound with an electromagnetic coil 27, and a working gap is provided between the electromagnetic coil 27 and the heat-insulating bushing 30, and the right end of the loading head 15 is provided with a heat-insulating cover plate 28, and the heat-insulating cover plate 28 seals the heat-conducting sleeve 29 in the loading head 15, so that the calibration cone sleeve 24 is connected to the calibration cone sleeve 24. A heating chamber is formed inside the loading head 15 between the cone sleeve 24 and the thermal insulation cover plate 28. The left end of the calibration support rod 21 passes through the thermal insulation cover plate 28, and extends into the heat conductive sleeve 29, and is connected to the right end of the wind tunnel balance 25. Working gaps are provided between the heat conductive sleeve 29 and the wind tunnel balance 25 and the calibration support rod 21. A working gap is provided between the calibration support rod 21 and the thermal insulation cover plate 28. A balance body temperature sensor 31 is provided on the wind tunnel balance 25, and an infrared temperature measuring device 26 is provided on the loading head 15. The probe of the infrared temperature measuring device 26 faces the electromagnetic coil 27.

[0051] The right end of the heat-conducting sleeve 29 and the left end of the calibration support rod 21 can be heated simultaneously by the electromagnetic coil 27. The heat generated by the electromagnetic coil 27 is transferred to the left end of the wind tunnel balance 25 through the heat-conducting sleeve 29 and the calibration cone sleeve 24. At the same time, the heat generated by the electromagnetic coil 27 is also transferred to the right end of the wind tunnel balance 25 through the left end of the calibration support rod 21. The infrared temperature measuring device 26 and the balance body temperature sensor 31 monitor the temperatures of the heat-conducting sleeve 29 and the wind tunnel balance 25 respectively. At this time, the electromagnetic coil 27 is controlled to work, and the infrared temperature measuring device 26 is used for feedback control to stabilize the position directly heated by the electromagnetic coil 27 at the target temperature. After a period of stability, the data collected by the balance body temperature sensor 31 is used to judge whether the temperature of the wind tunnel balance 25 tends to be balanced. When the temperature of the wind tunnel balance 25 reaches equilibrium, calibration can be performed; when the temperature of the wind tunnel balance 25 needs to be changed, it is only necessary to change the target temperature of the electromagnetic coil 27.

[0052] In view of the calibration requirements of a balance in a high temperature environment, the present invention provides a variable temperature calibration loading device for a six-component rod-type balance in a wind tunnel. The present invention can quickly heat the wind tunnel balance 25 while calibrating, and control the heating temperature of the electromagnetic coil 27 through a control program. The heated volume of the heating chamber is relatively small, and the body temperature of the wind tunnel balance 25 is more likely to reach equilibrium. By controlling the electromagnetic coil 27 to perform intermittent heating, the temperature of the wind tunnel balance 25 is stabilized at a required temperature. At the same time, the surface temperature of the loading head 15 is obtained through the surface temperature sensor 23 of the loading device, and the influence of the temperature on the deformation of the loading head 15 is obtained by measuring the displacement of the M1 target point 17, the M2 target point 18, the M3 target point 19 and the M4 target point 20. Then, the loading data of the wind tunnel balance 25 is corrected according to the influence of the deformation of the loading head 15 caused by heat. After the correction, more accurate loading data of the wind tunnel balance can be obtained. The device of the present invention has the characteristics of small size, small occupation of calibration space, fast heating speed, stable and controllable temperature, etc.

[0053] The electromagnetic coil 27 is slidably matched with the heat-conducting sleeve 29, and the electromagnetic coil 27 is detachably connected to the calibration support rod 21 through the fixture 22. The installation position of the electromagnetic coil 27 is set according to the target temperature. The heating effect can be adjusted by changing the length and axial position of the electromagnetic coil 27. Under normal circumstances, when the target temperature of the wind tunnel balance 25 is less than or equal to 100°C, Figure 5 As shown, the electromagnetic coil 27 only needs to be placed at the left end of the calibration support rod 21. When the target temperature of the wind tunnel balance 25 is greater than 100°C, Figure 6 As shown, the electromagnetic coil 27 needs to be placed in the middle position of the wind tunnel balance 25.

[0054] The heat insulating bushing 30 is an aerogel felt or asbestos component. The heat insulating bushing 30 is pasted on the inner wall of the loading head 15. The heat insulating bushing 30 can play a heat insulating role and is used to reduce the deformation of the loading head 15 affected by temperature.

[0055] Embodiment 2: Figure 1 to Figure 6 As shown, a six-component rod balance variable temperature calibration correction method is implemented based on a six-component rod balance variable temperature calibration loading device described in Example 1, and includes the following steps:

[0056] Step 1: During the assembly process of the loading device, the calibration posture of the wind tunnel balance 25 is adjusted, the axial position of the electromagnetic coil 27 is adjusted, and the calibration posture of the loading head 15 is adjusted;

[0057] Step 2: Apply axial tension F to the other ends of G1 rod 1, G2 rod 2, G3 rod 3, G4 rod 4, G5 rod 5, G6 rod 6, G7 rod 7, G8 rod 8, G9 rod 9, G10 rod 10, G11 rod 11, G12 rod 12, G13 rod 13 and G14 rod 14, and mark them as F in turn. G1 、F G2 、F G3 、F G4 、F G5 、F G6 、F G7 、F G8 、F G9 、F G10 、F G11 、F G12 、F G13 and F G14 , then the six-element load expression of the wind tunnel balance 25 is as follows:

[0058] Normal force: Y=F G1 +F G2 +F G3 -F G4 -F G5 -F G6 ;

[0059] Axial force: X=F G8 +F G10 -F G7 -F G9 ;

[0060] Lateral force: Z=F G14 -F G13 ;

[0061] Rolling moment: Mx=F G11 -F G12 ×L Mx ;

[0062] Yaw moment: My=F G8 +F G9 -F G7 -F G10 ×LMx ;

[0063] Pitch moment: Mz=F G2 +F G6 -F G3 -F G4 ×L Mz ;

[0064] Among them, L Mx F G11 The arm of force is the distance from the axis of the G11 tie rod 11 to the XY plane of the spatial coordinate system; L Mz F G2 The moment arm is the distance from the axis of G2 tie rod 2 to the YZ plane of the spatial coordinate system;

[0065] Step 3: G1 rod 1, G2 rod 2, G3 rod 3, G4 rod 4, G5 rod 5, G6 rod 6, G7 rod 7, G8 rod 8, G9 rod 9, G10 rod 10, G11 rod 11, G12 rod 12, G13 rod 13 and G14 rod 14 are all referred to as loading rods, and the connection points between each loading rod and the loading head 15 are all referred to as loading points. During the variable temperature calibration of the wind tunnel balance 25, the loading head 15 expands due to heat, which will cause the position of each loading rod and the loading point to shift. At this time, the applied torque will produce a reference error due to the position shift of the loading point, affecting the loading accuracy. Therefore, after the loading point shifts, the force arm length of the loading point needs to be corrected to ensure the accuracy of the loading result. The specific correction method is as follows:

[0066] At room temperature, the M1 target point 17, the M2 target point 18, the M3 target point 19 and the M4 target point 20 are positioned respectively by a laser tracker, and the X value of the M1 target point 17 is marked as X 10 , mark the X value of M2 target 18 as X 20 , mark the Z value of M3 target 19 as Z 30 , mark the Z value of M4 target 20 as Z 40 :

[0067] Step 4: Heat the calibration support rod 21 and the heat-conducting sleeve 29 through the electromagnetic coil 27, and set the maximum target temperature of the wind tunnel balance 25 to T 目标 , the temperature of the electromagnetic coil 27 is raised from the normal temperature T0 to T1, T2 and T 目标 , where T1=1 / 3T 目标 , T2=2 / 3T 目标 The temperature of the electromagnetic coil 27 is monitored by the balance body temperature sensor 31. When the temperature of the electromagnetic coil 27 is stabilized at T1, the X value of the target point M1 17 is recorded as X 11 , record the X value of M2 target 18 as X21 , record the Z value of M3 target 19 as Z 31 , record the Z value of M4 target 20 as Z 41 When the temperature of the electromagnetic coil 27 is stabilized at T2, the X value of the target point M1 17 is recorded as X 12 , record the X value of M2 target 18 as X 22 , record the Z value of M3 target 19 as Z 32 , record the Z value of M4 target 20 as Z 42 , when the temperature of the electromagnetic coil 27 is stable at T 目标 When X is equal to 17, the X value of M1 target point 17 is recorded as X 13 , record the X value of M2 target 18 as X 23 , record the Z value of M3 target 19 as Z 33 , record the Z value of M4 target 20 as Z 43 , then the temperature of the electromagnetic coil 27 rises from room temperature T0 to T 目标 In the process, a total of 16 target coordinates can be obtained, and the feedback temperature of the loading device surface temperature sensor 23 is defined as T ’ ;

[0068] Step 5: Coupling to obtain the curve formula of each target point coordinate changing with temperature:

[0069] The change curve of M1 target point 17 along the X axis: X1=f M1 T ’ ;

[0070] The change curve of M2 target point 18 along the X axis: X2=f M2 T ’ ;

[0071] The change curve of M3 target point 19 along the Z axis: Z3=f M3 T ’ ;

[0072] The change curve of M4 target point 20 along the Z axis: Z4=f M4 T ’ ;

[0073] The above function can characterize the displacement of the M1 target point 17, the M2 target point 18, the M3 target point 19 and the M4 target point 20 and the feedback temperature T of the surface temperature sensor 23 of the loading device. ’ The corresponding relationship;

[0074] Step 6: During the actual loading calibration process, collect the feedback temperature T of the surface temperature sensor 23 of the loading device ’, and bring into the four curve formulas in step 5, we can get the displacements of M1 target point 17, M2 target point 18, M3 target point 19 and M4 target point 20. The displacement formulas are as follows:

[0075] Displacement of M1 target point 17 along the X axis: ΔX1=f M1 T ’ -X 10 ;

[0076] Displacement of M2 target point 18 along the X axis: ΔX2=f M2 T ’ -X 20 ;

[0077] Displacement of M3 target point 19 along the Z axis: ΔZ3=f M3 T ’ -Z 30 ;

[0078] Displacement of M4 target 20 along the Z axis: ΔZ4=f M4 T ’ -Z 40 ;

[0079] Step 7: The three moment correction expressions of the wind tunnel balance 25 are as follows:

[0080] Roll correction moment: Mx 修正 =F G11 ×L Mx +ΔZ4-F G12 ×L Mx -ΔZ3;

[0081] Yaw correction moment: My 修正 =F G8 -F G7 ×L Mx -ΔZ3+F G9 -F G10 ×L Mx +ΔZ4;

[0082] Pitch correction moment: Mz 修正 =F G2 -F G4 ×L Mz +ΔX1+F G6 -F G3 ×L Mz -ΔX2;

[0083] Step 8: Obtain the accurate load value in real time through torque correction.

[0084] The advantages of the present invention are:

[0085] 1. Obtain the relationship between the thermal expansion of the loading head 15 and the temperature, and use this relationship to correct the change in the force arm of the loading point, which can effectively improve the accuracy of the loading results of the wind tunnel balance under high temperature conditions.

[0086] 2. The electromagnetic coil 27 has a fast heating speed and high heating efficiency, and the heating temperature can be controlled by the balance body temperature sensor 31.

[0087] 3. The wind tunnel balance 25 is indirectly heated by heat conduction through the heat-conducting sleeve 29 and the calibration support rod 21, so that the temperature change of the wind tunnel balance 25 is more stable; the thermal insulation cover 28 and the thermal insulation sleeve 30 can insulate the heating chamber, reduce the convective heat transfer effect, and make the temperature of the wind tunnel balance 25 easier to stabilize.

[0088] 4. By adjusting the length and axial position of the electromagnetic coil 27 , the heating effect of the electromagnetic coil 27 can be adjusted to adapt to wind tunnel balances 25 of different sizes.

[0089] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A six-component rod balance variable temperature calibration loading device, characterized in that: The loading head (15) comprises a loading head (15), which is a cylindrical component. The X-axis of the spatial coordinate system is set to be positive to the left, the Y-axis is positive to the upward, and the Z-axis is positive to the rear. The loading head (15) is coaxial with the X-axis of the spatial coordinate system. A left connecting ring is provided at the left end of the loading head (15). A G4 pull rod (4) is connected to the lower side of the left connecting ring through a force transmission and interference elimination component (16). A G2 pull rod (2) is connected to the upper side of the left connecting ring through a force transmission and interference elimination component (16). An M1 target point (17) is provided on the upper side of the left connecting ring. A right connecting ring is provided at the right end of the loading head (15). A G6 pull rod (6) is connected to the lower side of the right connecting ring through a force transmission and interference elimination component (16). A G3 pull rod (3) The upper side of the right connecting ring is connected to the upper side of the right connecting ring through a force transmission and interference elimination member (16), and an M2 target point (18) is provided on the upper side of the right connecting ring. A middle connecting ring is provided in the middle of the loading head (15). The G5 pull rod (5) is connected to the lower side of the middle connecting ring through the force transmission and interference elimination member (16). The G1 pull rod (1) is connected to the upper side of the middle connecting ring through the force transmission and interference elimination member (16). A loading device surface temperature sensor (23) is provided on the middle connecting ring. A front loading arm extends forward from the front side of the middle connecting ring, and a rear loading arm extends backward from the rear side of the middle connecting ring. The G7 pull rod (7) is connected to the front left side of the front loading arm through the force transmission and interference elimination member (16). The G8 pull rod (8) is connected to the front left side of the front loading arm through the force transmission and interference elimination member (16). The G12 pull rod (12) is connected to the front right side of the front loading arm through the force transmission interference elimination member (16), the G13 pull rod (13) is connected to the front front side of the front loading arm through the force transmission interference elimination member (16), the G9 pull rod (9) is connected to the rear left side of the rear end of the rear loading arm through the force transmission interference elimination member (16), the G10 pull rod (10) is connected to the rear right side of the rear end of the rear loading arm through the force transmission interference elimination member (16), the G11 pull rod (11) is connected to the rear lower side of the rear loading arm through the force transmission interference elimination member (16), and the G14 pull rod (14) is connected to the rear side of the rear loading arm through the force transmission interference elimination member (16). The front loading arm is connected to the rear end, an M3 target point (19) is provided on the upper side of the front end of the front loading arm, an M4 target point (20) is provided on the upper side of the rear end of the rear loading arm, a G2 pull rod (2), a G3 pull rod (3), a G4 pull rod (4), a G6 pull rod (6), a G11 pull rod (11) and a G12 pull rod (12) are all arranged parallel to the Y axis of the spatial coordinate system, a G1 pull rod (1) and a G5 pull rod (5) are arranged coincident with the Y axis of the spatial coordinate system, a G7 pull rod (7), a G8 pull rod (8), a G9 pull rod (9) and a G10 pull rod (10) are all arranged parallel to the X axis of the spatial coordinate system, and a G13 pull rod (13) and a G14 pull rod (14) are all arranged coincident with the Z axis of the spatial coordinate system; The outer periphery of the calibration cone sleeve (24) is matched with the inner periphery of the loading head (15), the left end of the wind tunnel balance (25) is connected to the calibration cone sleeve (24), the heat conductive sleeve (29) is sleeved on the outer periphery of the wind tunnel balance (25), the left end of the heat conductive sleeve (29) is connected to the calibration cone sleeve (24), the inner periphery of the loading head (15) is provided with a heat insulating sleeve (30), the outer periphery of the heat conductive sleeve (29) is wound with an electromagnetic coil (27), and the right end of the loading head (15) is provided with a heat insulating cover plate (28), and the heat insulating cover plate (28) seals the heat conductive sleeve (29) in the loading head (15) so that the calibration cone sleeve (29) is not calibrated. A heating chamber is formed inside the loading head (15) between the quasi-conical sleeve (24) and the heat-insulating cover plate (28). The left end of the calibration support rod (21) passes through the heat-insulating cover plate (28) and extends into the heat-conducting sleeve (29) and is connected to the right end of the wind tunnel balance (25). Working gaps are provided between the heat-conducting sleeve (29), the wind tunnel balance (25) and the calibration support rod (21). A balance body temperature sensor (31) is provided on the wind tunnel balance (25). An infrared temperature measuring device (26) is provided on the loading head (15), and a measuring head of the infrared temperature measuring device (26) faces the electromagnetic coil (27).

2. A six-component beam balance variable temperature calibration loading device according to claim 1, characterized in that: The electromagnetic coil (27) is slidably matched with the heat-conducting sleeve (29), and the electromagnetic coil (27) is detachably connected to the calibration support rod (21) via a fixer (22).

3. A six-component beam balance variable temperature calibration loading device according to claim 1 or 2, characterized in that: The heat insulating bushing (30) is an aerogel felt or asbestos component, and the heat insulating bushing (30) is adhered to the inner wall of the loading head (15).

4. A six-component beam balance variable temperature calibration correction method, implemented by relying on a six-component beam balance variable temperature calibration loading device according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: During the assembly process of the loading device, the calibration posture of the wind tunnel balance (25) is adjusted, the axial position of the electromagnetic coil (27) is adjusted, and the calibration posture of the loading head (15) is adjusted; Step 2: Apply axial tension F to the other ends of the G1 rod (1), G2 rod (2), G3 rod (3), G4 rod (4), G5 rod (5), G6 rod (6), G7 rod (7), G8 rod (8), G9 rod (9), G10 rod (10), G11 rod (11), G12 rod (12), G13 rod (13) and G14 rod (14), and mark them as F in turn. G1 、F G2 、F G3 、F G4 、F G5 、F G6 、F G7 、F G8 、F G9 、F G10 、F G11 、F G12 、F G13 and F G14 , then the six-element load expression of the wind tunnel balance (25) is as follows: Normal force: Y=F G1 +F G2 +F G3 -F G4 -F G5 -F G6 ; Axial force: X=F G8 +F G10 -F G7 -F G9 ; Lateral force: Z=F G14 -F G13 ; Rolling moment: Mx = (F G11 -F G12 )×L Mx ; Yaw moment: My = (F G8 +F G9 -F G7 -F G10 )×L Mx ; Pitch moment: Mz = (F G2 +F G6 -F G3 -F G4 )×L Mz ; Among them, L Mx F G11 The arm of force is the distance from the axis of the G11 tie rod (11) to the XY plane of the spatial coordinate system; L Mz F G2 The moment arm is the distance from the axis of the G2 tie rod (2) to the YZ plane of the spatial coordinate system; Step 3: Under normal temperature conditions, the M1 target point (17), the M2 target point (18), the M3 target point (19) and the M4 target point (20) are located respectively by a laser tracker, and the X value of the M1 target point (17) is marked as X. 10 , the X value of the M2 target (18) is marked as X 20 , the Z value of the M3 target (19) is marked as Z 30 , the Z value of the M4 target (20) is marked as Z 40 ; Step 4: Heat the calibration support rod (21) and the heat-conducting sleeve (29) by means of the electromagnetic coil (27), and set the maximum target temperature of the wind tunnel balance (25) to , the temperature of the electromagnetic coil (27) is raised from the normal temperature T0 to T1, T2 and , where T1=1 / 3T 目标 , T2=2 / 3T 目标 The temperature of the electromagnetic coil (27) is monitored by the balance body temperature sensor (31). When the temperature of the electromagnetic coil (27) is stabilized at T1, the X value of the target point M1 (17) is recorded as X 11 , record the X value of the M2 target (18) as X 21 , record the Z value of the M3 target (19) as Z 31 , record the Z value of the M4 target (20) as Z 41 When the temperature of the electromagnetic coil (27) is stabilized at T2, the X value of the target point M1 (17) is recorded as X 12 , record the X value of the M2 target (18) as X 22 , record the Z value of the M3 target (19) as Z 32 , record the Z value of the M4 target (20) as Z 42 , when the temperature of the electromagnetic coil (27) is stabilized at T 目标 When X is equal to X, the X value of the M1 target (17) is recorded as X 13 , record the X value of the M2 target (18) as X 23 , record the Z value of the M3 target (19) as Z 33 , record the Z value of the M4 target (20) as Z 43 , then when the temperature of the electromagnetic coil (27) rises from room temperature T0 to T 目标 In the process, 16 target coordinates are obtained, and the feedback temperature of the loading device surface temperature sensor (23) is defined as T ’ ; Step 5: Coupling to obtain the curve formula of each target point coordinate changing with temperature: Change curve of M1 target point (17) along the X-axis: X1=f M1 (T ’ ); The change curve of M2 target point (18) along the X-axis: X2=f M2 (T ’ ); The change curve of M3 target point (19) along the Z axis: Z3=f M3 (T ’ ); The change curve of M4 target point (20) along the Z axis: Z4=f M4 (T ’ ); The above functions represent the displacement of target point M1 (17), target point M2 (18), target point M3 (19) and target point M4 (20) and the feedback temperature T of the surface temperature sensor (23) of the loading device. ’ The corresponding relationship; Step 6: During the actual loading calibration process, collect the feedback temperature T of the loading device surface temperature sensor (23) ’ , and then substitute the four curve formulas in step 5 to obtain the displacements of target point M1 (17), target point M2 (18), target point M3 (19) and target point M4 (20). The displacement formulas are as follows: Displacement of target point M1 (17) along the X axis: ΔX1=f M1 (T ’ )-X 10 ; Displacement of target point M2 (18) along the X axis: ΔX2=f M2 (T ’ )-X 20 ; Displacement of the M3 target point (19) along the Z axis: ΔZ3=f M3 (T ’ )-Z 30 ; Displacement of the M4 target point (20) along the Z axis: ΔZ4=f M4 (T ’ )-Z 40 ; Step 7: The three moment correction expressions of the wind tunnel balance (25) are as follows: Roll correction moment: Mx 修正 =F G11 ×(L Mx +ΔZ4)-F G12 ×(L Mx -ΔZ3) Yaw correction moment: My 修正 =(F G8 -F G7 )×(L Mx -ΔZ3)+(F G9 -F G10 )×(L Mx +ΔZ4) Pitch correction moment: Mz 修正 =(F G2 -F G4 )×(L Mz +ΔX1)+(F G6 -F G3 )×(L Mz -ΔX2) Step 8: Obtain the accurate load value in real time through torque correction.

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