A hypersonic wind tunnel single-component spoke-type roll balance calibration device

Abstract

The invention discloses a hypersonic wind tunnel single-component spoke-type rolling balance calibration device. The clamp frame of the trapezoidal clamp of the calibration device is an isosceles trapezoid, the upper surface of the upper base of the clamp frame is a horizontal reference plane, and the lower surface of the lower base of the clamp frame has a boss; the central circular hole of the clamp frame is cut with parallel arc gaps I and II with a vertex angle range of 180° to 300°, and the boss is cut by a straight slit perpendicular to the arc gaps I and II; the clamp frame between the arc gaps I and II forms an elastic tension ring, which is tightened by a tension bolt II passing through the boss and a matching tension nut; the two ends of the lower bottom of the clamp frame extend outwards to form symmetrically distributed left and right ends, and each end is installed with a weight tray through a rectangular connecting frame. The calibration device has a simple structure, is easy to disassemble, convenient to operate, has high processing accuracy, and has a small installation error. The static calibration accuracy of the obtained single-component spoke-type rolling balance can reach 0.05%, and the accuracy is 0.10%.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel tests, and in particular relates to a hypersonic wind tunnel single-component spoke-type rolling balance calibration device. Background Art

[0002] The small roll moment measurement technology has a wide and urgent demand in the hypersonic wind tunnel test of aircraft. For example, when a miniaturized warhead reenters the atmosphere, the ablation of the warhead surface will produce an asymmetric shape, which will cause the warhead to produce a small roll moment. When the warhead roll rate is close to the pitch rate, roll resonance is likely to occur. When the warhead roll rate is close to zero, the accuracy of the warhead landing point will decrease, and the roll rate is directly related to the roll moment. During the development of strategic missiles abroad, there have been accidents in which missiles were damaged or the accuracy of landing points decreased due to roll moments. Therefore, predicting the aerodynamic characteristics of warhead reentry, especially improving the ability to accurately predict the small roll moment characteristics, is a key technical problem that must be solved in aircraft design.

[0003] At present, various forms of roll balances have been developed in hypersonic wind tunnel tests to measure small roll moments, providing a basis for the roll control design of missiles. The performance of the roll balance needs to be verified by ground calibration, so it is particularly important to accurately calibrate the performance indicators of the high-precision roll balance. The existing balance calibration device is only suitable for conventional rod balances, not for the newly developed single-component spoke roll balance.

[0004] Currently, there is an urgent need to develop a dedicated hypersonic wind tunnel single-component spoke-type roll balance calibration device. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a hypersonic wind tunnel single-component spoke-type rolling balance calibration device.

[0006] The hypersonic wind tunnel single-component spoke-type rolling balance calibration device of the present invention is characterized in that the calibration device comprises a trapezoidal clamp, the clamp frame of the trapezoidal clamp is an isosceles trapezoid, the upper surface of the upper bottom of the clamp frame is a horizontal reference plane, and a boss is arranged at the center of the lower surface of the lower bottom of the clamp frame;

[0007] A circular hole for installing a single-component spoke-type rolling balance is opened at the midpoint of the midline of the clamp frame, and parallel arc gaps I and II with a vertex angle range of 180° to 300° are cut along the circumference of the circular hole. A straight slit perpendicular to the arc gaps I and II is opened at the lowest point of the arc gaps I and II, that is, the boss on the lower surface of the lower bottom of the clamp frame. The straight slit cuts the boss on the lower surface of the lower bottom of the clamp frame. The clamp frame between the arc gaps I and II forms an elastic tensioning ring, and a horizontal through hole II is opened on the cut boss. A tensioning bolt II passes through the through hole II, and the elastic tensioning ring is tightened by a tensioning nut and a flat washer II.

[0008] The two ends of the lower bottom of the clamp frame extend outwards to form symmetrically distributed left and right ends, respectively. The upper surface of each end is a horizontal plane, and a vertical through hole I is formed on the end, and a top with a sharp corner facing upward is fixed in the through hole I; a top cap is installed on the top surface of the rectangular connection frame, and a tapered hole with a small top and a large bottom is vertically formed on the axis of the top cap, and the rectangular connection frame is sleeved on the end cap, and the top cap is pressed against the top corner of the tapered hole of the top cap, and the top cap and the top cap are in point contact; a vertical through hole is formed on the bottom surface of the rectangular connection frame, and a connecting rod is inserted into the through hole from bottom to top, and the top end of the connecting rod is fixed to the bottom surface of the rectangular connection frame through a connecting rod limit nut, and a weight tray is fixed at the end of the connecting rod;

[0009] The fixture frame is also provided with left-right symmetrical weight-reducing holes.

[0010] The distance between the arc gap I and the arc gap II is greater than the spoke width of the single-component spoke type rolling balance.

[0011] The straight seam width is greater than 2 mm.

[0012] The inner wall surface of the elastic tension ring is roughened by grinding, and the surface roughness ranges from 0.5 μm to 1 μm.

[0013] Alternatively, a rubber band is adhered to the inner wall of the elastic tension ring.

[0014] The trapezoidal clamp, rectangular connecting frame, connecting rod and weight tray are made of 7075 aluminum alloy.

[0015] The material of the top cap and the top tip is 30CrMnSiA.

[0016] The hypersonic wind tunnel single-component spoke-type rolling balance calibration device of the present invention has the following advantages:

[0017] 1. Simple structure, easy disassembly and convenient operation;

[0018] 2. The trapezoidal fixture is processed by one-piece molding, with high processing precision and small installation error;

[0019] 3. The trapezoidal fixture, rectangular connecting frame, connecting rod and weight tray are all made of lightweight and high-strength 7075 aluminum alloy material, which is light in weight and helps to eliminate the interference of the gravity of the loading device on the rolling moment calibration results;

[0020] 4. The horizontal reference plane on the upper surface of the upper base of the trapezoidal fixture can detect the roll angle of the hypersonic wind tunnel single-component spoke-type roll balance calibration device of the present invention to ensure the accuracy of the calibration data.

[0021] The single-component spoke-type rolling balance static calibration accuracy of the single-component spoke-type rolling balance calibration device for a hypersonic wind tunnel of the present invention can reach 0.05%, and the accuracy reaches 0.10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of assembling a hypersonic wind tunnel single-component spoke-type roll balance calibration device and a single-component spoke-type roll balance of the present invention;

[0023] Figure 2 It is a schematic plan view of a trapezoidal fixture in a hypersonic wind tunnel single-component spoke-type roll balance calibration device of the present invention;

[0024] Figure 3 It is a schematic diagram of the circular arc gap of the trapezoidal fixture in the hypersonic wind tunnel single-component spoke-type roll balance calibration device of the present invention;

[0025] Figure 4 It is a schematic diagram of the straight seam of the trapezoidal clamp in the hypersonic wind tunnel single-component spoke-type roll balance calibration device of the present invention;

[0026] Figure 5 It is a schematic diagram of the installation of a single-component spoke-type roll balance calibration device for a hypersonic wind tunnel according to the present invention;

[0027] Figure 6 A load curve diagram obtained by calibrating a single-component spoke-type roll balance using the hypersonic wind tunnel single-component spoke-type roll balance calibration device of the present invention;

[0028] Figure 7 The present invention is a static calibration fitting curve obtained by calibrating a single-component spoke-type roll balance using the hypersonic wind tunnel single-component spoke-type roll balance calibration device of the present invention.

[0029] In the figure, 1. single-component spoke type rolling balance, 2. trapezoidal clamp, 3. connecting piece, 4. tail support rod, 5. top cap, 6. top, 7. rectangular connecting frame, 8. connecting rod limit nut, 9. connecting rod, 10. weight tray, 11. tension bolt Ⅰ, 12. elastic gasket, 13. flat washer Ⅰ, 14. tension nut, 15. flat washer Ⅱ, 16. tension bolt Ⅱ;

[0030] 201. Clamp frame, 202. Elastic tension ring, 203. Through hole I, 204. Through hole II, 205. Arc gap I, 206. Arc gap II, 207. Straight seam. Specific implementation plan

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1 , 2 As shown, the hypersonic wind tunnel single-component spoke-type rolling balance calibration device of the present invention comprises a trapezoidal fixture 2, a fixture frame 201 of the trapezoidal fixture 2 is an isosceles trapezoid, the upper surface of the upper bottom of the fixture frame 201 is a horizontal reference plane, and a boss is provided at the center of the lower surface of the lower bottom of the fixture frame 201;

[0033] like Figure 3 , 4 As shown, a circular hole for installing a single-component spoke-type rolling balance 1 is opened at the midpoint of the midline of the fixture frame 201, and parallel arc gaps I 205 and arc gaps II 206 with a vertex angle range of 180° to 300° are cut along the circumference of the circular hole. At the lowest point of the arc gaps I 205 and the arc gaps II 206, that is, at the lower surface boss of the lower bottom of the fixture frame 201, a vertical arc gap I 205 and the arc gap II 206 are opened. The straight slit 207 of the gap II 206 cuts the boss on the lower surface of the bottom of the clamp frame 201, and the clamp frame 201 between the arc gap I 205 and the arc gap II 206 forms an elastic tension ring 202. A horizontal through hole II 204 is opened on the cut boss, and the tension bolt II 16 passes through the through hole II 204, and the elastic tension ring 202 is tightened by the tension nut 14 and the flat washer II 15;

[0034] The two ends of the lower bottom of the clamp frame 201 extend outwards to form symmetrically distributed left and right ends, respectively. The upper surface of each end is a horizontal plane, and a vertical through hole Ⅰ203 is formed on the end, and a top 6 with a sharp corner facing upward is fixed in the through hole Ⅰ203; a top cap 5 is installed on the top surface of the rectangular connecting frame 7, and a tapered hole with a small top and a large bottom is vertically formed on the axis of the top cap 5. The rectangular connecting frame 7 is sleeved on the end, and the top 6 is pressed on the top corner of the tapered hole of the top cap 5, and the top 6 and the top cap 5 are in point contact; a vertical through hole is formed on the bottom surface of the rectangular connecting frame 7, and a connecting rod 9 is inserted into the through hole from bottom to top. The top end of the connecting rod 9 is fixed to the bottom surface of the rectangular connecting frame 7 through a connecting rod limit nut 8, and a weight tray 10 is fixed at the end of the connecting rod 9;

[0035] The fixture frame 201 is also provided with bilaterally symmetrical weight-reducing holes.

[0036] The distance between the arc gap I 205 and the arc gap II 206 is greater than the spoke width of the single-component spoke type rolling balance 1 .

[0037] The width of the straight seam 207 is greater than 2 mm.

[0038] The inner wall surface of the elastic tension ring 202 is roughened by grinding, and the surface roughness ranges from 0.5 μm to 1 μm.

[0039] The inner wall of the elastic tension ring 202 is adhered with a rubber band.

[0040] The trapezoidal clamp 2, the rectangular connecting frame 7, the connecting rod 9 and the weight tray 10 are made of 7075 aluminum alloy.

[0041] The material of the top cap 5 and the top 6 is 30CrMnSiA.

[0042] Example 1

[0043] The schematic diagram of the installation of the hypersonic wind tunnel single-component spoke-type rolling balance calibration device of the present invention is shown in FIG. Figure 5 As shown, the calibration process includes the following steps:

[0044] a. Fix the tail support rod 4 to the balance calibration system, and then fix the connector 3 to the tail support rod 4, and then adjust the pitch angle of the tail support rod 4 to be less than 0.02°;

[0045] b. Put the single-component spoke-type rolling balance 1 on the front end column section of the connecting member 3; insert a flat key into the flat key slot hole in the center of the single-component spoke-type rolling balance 1 to prevent the single-component spoke-type rolling balance 1 from rotating in the circumferential direction; insert a flat washer Ⅰ13 and an elastic gasket 12 on the front end column section of the connecting member 3 in sequence, and then vertically fix the single-component spoke-type rolling balance 1 on the front end column section of the connecting member 3 by tightening bolts Ⅰ11;

[0046] c. Put the trapezoidal fixture 2 on the outer circle of the single-component spoke-type rolling balance 1, so that the end faces of the single-component spoke-type rolling balance 1 and the trapezoidal fixture 2 are parallel; adjust the axial position of the trapezoidal fixture 2 so that the single-component spoke-type rolling balance 1 is located between the arc gap Ⅰ205 and the arc gap Ⅱ206;

[0047] d. Place a level measuring instrument on the upper surface of the upper bottom of the trapezoidal fixture 2, and adjust the roll angle of the trapezoidal fixture 2 until the roll angle is less than 0.02°; pass the tension bolt Ⅱ16 through the through hole Ⅱ204, tighten the elastic tension ring 202 through the tension nut 14 and the flat washer Ⅱ15, and lock the single-component spoke-type roll balance 1;

[0048] e. Place a level measuring instrument on the upper surface of the upper bottom of the trapezoidal clamp 2 to measure the roll angle of the trapezoidal clamp 2. If the roll angle is greater than 0.02°, remove the tightening nut 14, the flat washer II 15 and the tightening bolt II 16; repeat step d until the roll angle of the trapezoidal clamp 2 is less than 0.02°;

[0049] f. The left and right ends of the trapezoidal fixture 2 are respectively installed with a rectangular connection frame 7, and the top 6 of the fixture frame 201 is placed on the top of the conical hole of the top cap 5 of the rectangular connection frame 7;

[0050] g. Load the weights on the weight tray 10 in a stepwise manner. First, add 8 0.1kg weights to the right weight tray 10. At this time, the rolling moment of the single-component spoke-type rolling balance 1 is 1N·m; adjust the tail support rod 4 so that the roll angle of the trapezoidal fixture 2 is less than 0.02°, and collect the voltage output of the single-component spoke-type rolling balance 1;

[0051] h. Move the 8 0.1kg weights on the right weight tray 10 to the left weight tray 10 one by one. Each time a weight is moved, the tail support rod 4 needs to be adjusted until the roll angle of the trapezoidal fixture 2 is less than 0.02°, and then the voltage output of the single-component spoke-type rolling balance 1 is collected; finally, the number of weights on the right weight tray 10 is 0, and the number of weights on the left weight tray 10 is 8. The weights are moved from the right weight tray 10 to the left weight tray 10, and the voltage output of the single-component spoke-type rolling balance 1 is collected 9 times in total;

[0052] i. Move the 8 0.1kg weights on the left weight tray 10 one by one to the right weight tray 10. Each time a weight is moved, the tail support rod 4 needs to be adjusted until the roll angle of the trapezoidal fixture 2 is less than 0.02°, and then the voltage output of the single-component spoke-type rolling balance 1 is collected; finally, the number of weights on the left weight tray 10 is 0, and the number of weights on the right weight tray 10 is 8. The weights are moved from the left weight tray 10 to the right weight tray 10, and the voltage output of the single-component spoke-type rolling balance 1 is collected 9 times in total;

[0053] j. Repeat steps h and i to complete the required single-component spoke-type rolling balance 1 in both positive and negative directions to repeat the static calibration;

[0054] k. Convert the obtained voltage output of the single-component spoke-type roll balance 1 into static calibration data; and calculate the performance index of the single-component spoke-type roll balance 1 according to the static calibration data.

[0055] Note that the end face of the single-component spoke-type rolling balance 1 is perpendicular to the axial direction of the tail support rod 4 .

[0056] During calibration, the load curve obtained by step-loading the weights on a single-component spoke-type rolling balance is shown in Figure 6 .

[0057] After calibration, the static calibration results of the single-component spoke-type rolling balance are shown in Table 1, and the obtained static calibration fitting curve of the single-component spoke-type rolling balance is shown in Figure 7 .

[0058] From Table 1 and Figure 7 It can be seen that the static calibration accuracy of the single-component spoke-type rolling balance of the hypersonic wind tunnel single-component spoke-type rolling balance calibration device of the present invention can reach 0.05%, and the accuracy can reach 0.10%.

[0059] Table 1 shows the static calibration results of the single-component spoke-type roll balance.

[0060] Table 1

Claims

1. A hypersonic wind tunnel single-component spoke-type rolling balance calibration device, characterized in that: The calibration device comprises a trapezoidal clamp (2), the clamp frame (201) of the trapezoidal clamp (2) is an isosceles trapezoid, the upper surface of the upper base of the clamp frame (201) is a horizontal reference plane, and a boss is provided at the center of the lower surface of the lower base of the clamp frame (201); A circular hole for installing a single-component spoke-type rolling balance (1) is opened at the midpoint of the midline of the fixture frame (201), and parallel arc gaps I (205) and arc gaps II (206) with a vertex angle range of 180° to 300° are cut along the circumference of the circular hole. At the lowest point of the arc gaps I (205) and the arc gaps II (206), i.e., at the lower surface boss of the bottom of the fixture frame (201), a vertical arc gap I (205) and the arc gaps II (206) are opened. The straight seam (207) cuts the boss on the lower surface of the lower bottom of the clamp frame (201), the clamp frame (201) between the arc gap I (205) and the arc gap II (206) forms an elastic tension ring (202), the cut boss is provided with a horizontal through hole II (204), the tension bolt II (16) passes through the through hole II (204), and the elastic tension ring (202) is tightened by the tension nut (14) and the flat washer II (15); The two ends of the lower bottom of the clamp frame (201) extend outwards to form symmetrically distributed left and right ends, respectively. The upper surface of each end is a horizontal plane, and a vertical through hole I (203) is formed on the end, and a top end (6) with a sharp corner facing upward is fixed in the through hole I (203); a top cap (5) is installed on the top surface of the rectangular connecting frame (7), and a conical hole with a small top and a large bottom is vertically formed on the axis of the top cap (5). The rectangular connecting frame (7) is sleeved on the end, and the top end (6) is pressed against the top corner of the conical hole of the top cap (5), and the top end (6) and the top cap (5) are in point contact; a vertical through hole is formed on the bottom surface of the rectangular connecting frame (7), and a connecting rod (9) is inserted into the through hole from bottom to top. The top end of the connecting rod (9) is fixed to the bottom surface of the rectangular connecting frame (7) through a connecting rod limit nut (8), and a weight tray (10) is fixed at the end of the connecting rod (9); The fixture frame (201) is also provided with left-right symmetrical weight-reducing holes.

2. The hypersonic wind tunnel single-component spoke-type rolling balance calibration device according to claim 1, characterized in that: The distance between the circular arc gap I (205) and the circular arc gap II (206) is greater than the spoke width of the single-component spoke type rolling balance (1).

3. The hypersonic wind tunnel single-component spoke-type rolling balance calibration device according to claim 1, characterized in that: The width of the straight seam (207) is greater than 2 mm.

4. The hypersonic wind tunnel single-component spoke-type rolling balance calibration device according to claim 1, characterized in that: The inner wall surface of the elastic tension ring (202) is roughened by grinding, and the surface roughness ranges from 0.5 μm to 1 μm.

5. The hypersonic wind tunnel single-component spoke-type rolling balance calibration device according to claim 1, characterized in that: The inner wall of the elastic tension ring (202) is adhered with a rubber belt.

6. The hypersonic wind tunnel single-component spoke-type rolling balance calibration device according to claim 1, characterized in that: The trapezoidal clamp (2), the rectangular connecting frame (7), the connecting rod (9) and the weight tray (10) are made of 7075 aluminum alloy.

7. The hypersonic wind tunnel single-component spoke-type rolling balance calibration device according to claim 1, characterized in that: The material of the top cap (5) and the top tip (6) is 30CrMnSiA.

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