Method for correcting control precision of variable-angle mechanism of wind tunnel tail boom

Abstract

The invention discloses a wind tunnel tail boom variable angle mechanism control precision correction method, and relates to the field of wind tunnel test control, the wind tunnel tail boom variable angle mechanism is driven by a control system, the wind tunnel tail boom variable angle mechanism comprises a plurality of variable angle mechanisms, and according to the method, after the wind tunnel tail boom variable angle mechanism is assembled, the wind tunnel tail boom variable angle mechanism is driven by the control system. In the operation debugging process of the angle-variable mechanism, a high-precision laser tracker is introduced, and spatial position change measurement is carried out on identification points arranged on the angle-variable mechanism, so that the actual angle variation of the mechanism in the whole operation range is obtained; and comparing the actual operation angle with the angle given by the control system to obtain an error between the actual operation angle of the angle-variable mechanism and the angle given by the control system, and performing nonlinear fitting on the error to obtain a control system correction of the operation range of the angle-variable mechanism, thereby improving the control precision of the angle-variable mechanism of the wind tunnel tail boom.

Description

Technical Field

[0001] The invention relates to the field of wind tunnel test control, and in particular to a method for correcting the control accuracy of a wind tunnel tail strut angle-changing mechanism. Background Art

[0002] The wind tunnel tail strut angle-changing mechanism is a commonly used model angle support mechanism in low-speed wind tunnels. The pitch angle and sideslip angle of the model are changed through the tail strut angle-changing mechanism. The wind tunnel tail strut angle-changing mechanism is usually composed of a pitch mechanism, a front sideslip mechanism, a rear sideslip mechanism and a Y-direction mechanism. Among them, the pitch mechanism is mainly used to complete the pitch angle adjustment of the test model. The front sideslip angle and the rear sideslip angle are combined to complete the sideslip angle adjustment of the test model. The Y-direction mechanism is mainly used to adjust the position of the mechanism in the direction perpendicular to the wind tunnel flow field during the pitch angle adjustment of the model, so that the rotation center of the test model is always located on the axis of the wind tunnel. The appearance of the wind tunnel tail strut angle-changing mechanism is as follows: Figure 1 shown.

[0003] The angle-changing mechanism of the wind tunnel tail support usually drives each mechanism to rotate around the rotating shaft through a hydraulic cylinder to achieve the angle adjustment function of the mechanism. In the mechanism design process, each mechanism angle has a fixed corresponding relationship with the cylinder length. Through the movement relationship of the mechanism, the length of the cylinder on one side of the mechanism is used as the control object to achieve precise control of the mechanism angle. However, in the actual mechanism processing and assembly process, due to the errors in mechanical processing and assembly, there is a certain error between the mechanism angle control based on the design parameters and the actual mechanism angle operation.

[0004] Usually, the control accuracy of the tail strut angle-changing mechanism is ensured by high-precision machining and assembly errors. However, machining and assembly errors are often difficult to ensure, and during the maintenance or reassembly of the mechanism, the assembly error is difficult to ensure repeatability. This causes uncertainty in the control error of the mechanism after repeated assembly, and even causes the angle control error of the mechanism to exceed the design index requirements. Summary of the invention

[0005] The invention aims to improve the control accuracy of a wind tunnel tail support angle-changing mechanism.

[0006] To achieve the above object, the present invention provides a method for correcting the control accuracy of a wind tunnel tail support angle-changing mechanism, wherein the wind tunnel tail support angle-changing mechanism is driven by a control system, and the wind tunnel tail support angle-changing mechanism includes a plurality of angle-changing mechanisms. The method includes: Step 1: After completing the assembly of the wind tunnel tail support angle-changing mechanism, adjust all angles of all angle-changing mechanisms in the wind tunnel tail support angle-changing mechanism to the mechanical 0° position, and proceed to step 2; Step 2: The control system divides the operating range of the variable angle mechanism into a number of ordered angle change steps according to the operating range of the variable angle mechanism, obtains an angle sequence, and proceeds to step 3; Step 3: At the mechanical 0° position of the variable angle mechanism, the control system identifies the position as the identification point and the system 0° of the control system, obtains the spatial position information of the identification point when the variable angle mechanism is at the mechanical 0° position, and proceeds to step 4; Step 4: The control system drives the angle-changing mechanism to rotate around the rotation center of the mechanism according to the design dimension data of the angle-changing mechanism, and controls the angle-changing mechanism to run in the positive direction from 0° to the first angle change step in the angle sequence according to the corresponding relationship between the angle type of the angle-changing mechanism and the position of the driving mechanism of the angle-changing mechanism. After the control system controls the angle-changing mechanism to run the first angle change step, step 5 is entered; Step 5: Obtain the spatial position information of the identification point when the angle-variable mechanism is at the first angle-variable step, and proceed to step 6; Step 6: The control system controls the driving mechanism of the angle-changing mechanism to run to the driving mechanism position corresponding to the second angle change step in the angle sequence, and then proceeds to step 7; Step 7: Obtain the spatial position information of the identification point when the angle-variable mechanism is in the second angle change step in the angle sequence, and proceed to step 8; Step 8: The control system determines whether the current angle of the variable angle mechanism is the maximum angle or the minimum angle; if so, it proceeds to step 9; if not, it proceeds to step 10; Step 9: The control system drives the angle-changing mechanism to run in reverse to the next angle change step in the angle sequence relative to the angle change step in step 7, enters step 7 and updates the angle change step of the angle-changing mechanism in step 7 to the current angle change step; Step 10: The control system controls the angle-variable mechanism driving mechanism to move to a driving mechanism position corresponding to the next angle change step in the angle sequence relative to the angle change step in step 7, and then proceeds to step 11; Step 11: Determine whether the spatial position information of the identification points corresponding to the preset required number of angle change steps has been obtained. If so, proceed to step 12; if not, proceed to step 7 and update the angle change steps of the angle changing mechanism in step 7 to the current angle change steps; Step 12: Match all the spatial position information of the acquired identification points with the given angle of the control system, obtain the control error corresponding to each angle change step of the angle-variable mechanism, and proceed to step 13; Step 13: Take the average value of the control errors corresponding to each angle change step of the variable angle mechanism to obtain the average control error corresponding to each angle change step, and proceed to step 14; Step 14: Determine whether the average control error meets the control error requirement of the variable angle mechanism. If so, proceed to step 17; if not, proceed to step 15; Step 15: Taking the angle change steps of the variable angle mechanism as the horizontal coordinate and the average control error corresponding to the angle change steps of the variable angle mechanism as the vertical coordinate, multiple polynomial fittings are performed on the average control error to obtain the angle control error correction formula within the operating range of the variable angle mechanism, and then proceed to step 16; Step 16: In the control system, the angle control of the variable angle mechanism is corrected by using the obtained angle control error correction formula, and the process goes to step 2; Step 17: Use the current control parameters to achieve angle control of the variable angle mechanism and complete parameter optimization.

[0007] Furthermore, the angle-changing mechanism in the wind tunnel tail support angle-changing mechanism includes: a pitch mechanism, a front sideslip mechanism and a rear sideslip mechanism.

[0008] Furthermore, the operating range of the angle-changing mechanism is evenly divided into a number of orderly angle-changing steps.

[0009] Furthermore, the method uses a laser tracker to obtain spatial position information of the marking point.

[0010] Furthermore, the angle-changing mechanism in the wind tunnel tail support angle-changing mechanism is driven by an electric push rod or a hydraulic cylinder.

[0011] One or more technical solutions provided by the present invention have at least the following technical effects or advantages: The present invention proposes a method for correcting the control accuracy of a variable angle mechanism of a wind tunnel tail strut. After the variable angle mechanism of the wind tunnel tail strut is assembled, during the operation and debugging of the variable angle mechanism, a high-precision laser tracker is introduced to measure the spatial position change of marking points set by the variable angle mechanism, so as to obtain the actual angle change in the full range of mechanism operation, compare it with the angle given by the control system, and obtain the error between the actual operating angle of the variable angle mechanism and the angle given by the control system. By performing nonlinear fitting on the error, the control system correction amount in the full range of the variable angle mechanism operation is obtained, thereby improving the control accuracy of the variable angle mechanism of the wind tunnel tail strut. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation on the embodiments of the present invention; Figure 1 This is a schematic diagram of the wind tunnel tail support angle changing mechanism; Figure 2 This is the equipment composition diagram of the pitch mechanism control accuracy correction method; Among them, 1 is the first rotation center, 2 is the pitch mechanism, 3 is the front yaw mechanism, 4 is the rear yaw mechanism, 5 is the laser tracker, 6 is the marking point, 7 is the second rotation center, and 8 is the driving cylinder. DETAILED DESCRIPTION

[0013] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0014] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those within the scope of this description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0015] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0016] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0017] Embodiment 1;

[0018] Embodiment 1 of the present invention provides a method for correcting the control accuracy of a wind tunnel tail strut angle-changing mechanism, wherein the wind tunnel tail strut angle-changing mechanism is driven by a control system, and the wind tunnel tail strut angle-changing mechanism includes a plurality of angle-changing mechanisms, and the method includes: Step 1: After the wind tunnel tail support angle changing mechanism is assembled, all angles of all angle changing mechanisms in the wind tunnel tail support angle changing mechanism are adjusted to the mechanical 0° position, and then proceed to step 2; wherein, mechanical 0° means that after the angle changing mechanism and the test model are installed, the airflow direction is defined as the mechanical 0° of the angle changing mechanism and the test model according to the relative angle between the test model and the airflow direction of the test section; Step 2: The control system divides the operating range of the variable angle mechanism into several ordered angle change steps according to the operating range of the variable angle mechanism, obtains an angle sequence, for example, the pitch angle range is 0-90°, and an angle change step is every 10°, and then goes to step 3; the number of angle change steps is usually greater than 5; Step 3: At the mechanical 0° position of the variable angle mechanism, the control system identifies the position as the identification point and the system 0° of the control system, obtains the spatial position information of the identification point when the variable angle mechanism is at the mechanical 0° position, and proceeds to step 4; Step 4: The control system drives the angle-changing mechanism to rotate around the rotation center of the mechanism according to the design dimension data of the angle-changing mechanism, and controls the angle-changing mechanism to run from 0° in the positive direction to the first angle change step in the angle sequence according to the corresponding relationship between the angle type of the angle-changing mechanism and the position of the driving mechanism of the angle-changing mechanism. After the control system controls the angle-changing mechanism to run the first angle change step, it enters step 5; wherein the angle-changing mechanism generally includes a pitch angle mechanism and a yaw angle mechanism, and the structural dimensions of each mechanism are different. The angle type of the angle-changing mechanism and the position of the driving mechanism of the angle-changing mechanism have a corresponding corresponding relationship. In this field, the angle positioning control of the angle-changing mechanism can be realized through this corresponding relationship. This control belongs to a common method in this field, and the embodiments of the present invention will not be repeated accordingly; the control system needs to drive the servo motor or the hydraulic cylinder according to the mechanical structure parameters of the angle-changing mechanism to realize the angle positioning control function of the angle-changing mechanism; Step 5: Obtain the spatial position information of the identification point when the angle-variable mechanism is at the first angle-variable step, and proceed to step 6; Step 6: The control system controls the driving mechanism of the angle-changing mechanism to run to the driving mechanism position corresponding to the second angle change step in the angle sequence, and then proceeds to step 7; Step 7: Obtain the spatial position information of the identification point when the angle-variable mechanism is in the second angle change step in the angle sequence, and proceed to step 8; Step 8: The control system determines whether the current angle of the variable angle mechanism is the maximum angle or the minimum angle; if so, it proceeds to step 9; if not, it proceeds to step 10; Step 9: The control system drives the angle-changing mechanism to run in reverse to the next angle change step in the angle sequence relative to the angle change step in step 7, enters step 7 and updates the angle change step of the angle-changing mechanism in step 7 to the current angle change step; Step 10: The control system controls the angle-variable mechanism driving mechanism to move to a driving mechanism position corresponding to the next angle change step in the angle sequence relative to the angle change step in step 7, and then proceeds to step 11; Step 11: Determine whether the spatial position information of the identification points corresponding to the preset number of angle change steps has been obtained. If it has been obtained, go to step 12. If not, go to step 7 and update the angle change step of the variable angle mechanism in step 7 to the current angle change step; to ensure the accuracy of the correction value, the data obtained by 3 positive changes and 3 negative changes are used for fitting to obtain the best fitting data. In this method, the compensation angle is based on the operating range of the mechanism, first running step by step from 0° (usually not less than 5 steps) to the maximum angle, then running in the reverse direction to the minimum angle, running back and forth 3 times in the forward and reverse directions, and then obtaining 6 correction values ​​at each predetermined step angle position, and using the 6 error average values ​​for correction.

[0019] Step 12: Match all the spatial position information of the acquired identification points with the given angle of the control system, obtain the control error corresponding to each angle change step of the angle-variable mechanism, and proceed to step 13; if each angle change step corresponds to an angle, there are 6 corresponding control errors after 3 forward and reverse running tests; Step 13: Take the average value of the control errors corresponding to each angle change step of the variable angle mechanism to obtain the average control error corresponding to each angle change step, and proceed to step 14; Step 14: Determine whether the average control error meets the control error requirement of the variable angle mechanism. If so, proceed to step 17; if not, proceed to step 15. Usually, the control error requirement of the variable angle mechanism is better than 0.02°. The accuracy requirements of each set of variable angle mechanisms are not necessarily the same and can be adjusted according to actual needs. Step 15: Taking the angle change steps of the variable angle mechanism as the horizontal coordinate and the average control error corresponding to the angle change steps of the variable angle mechanism as the vertical coordinate, multiple polynomial fittings are performed on the average control error to obtain the angle control error correction formula within the operating range of the variable angle mechanism, and then proceed to step 16; Step 16: In the control system, the angle control of the variable angle mechanism is corrected by the obtained angle control error correction formula, and the process goes to step 2; if each angle change step corresponds to an angle, there are 6 corresponding control errors after 3 forward and reverse running tests, and the 6 errors are averaged. In EXCEL, a curve is drawn for the data corresponding to the angle and the error, with the horizontal axis being the mechanism angle and the vertical axis being the error. A trend line is added to the drawn curve in EXCEL, and the trend line is fitted by a 5th-order polynomial. By displaying the formula, the corresponding relationship between the angle of the variable angle mechanism and the corresponding correction value is obtained; Step 17: Use the current control parameters to achieve angle control of the variable angle mechanism and complete parameter optimization.

[0020] The angle-variable mechanism usually uses a servo motor or a hydraulic cylinder to achieve precise control of the angle change, and the control of the servo motor or the hydraulic cylinder needs to be achieved through a control system. The control system in the present invention usually includes commonly used hardware and software, and belongs to an existing control system, and the embodiments of the present invention will not be described in detail.

[0021] In the embodiments of the present invention, please refer to Figure 1 , Figure 1 This is a schematic diagram of the wind tunnel tail support angle changing mechanism. Figure 1 1 is the first rotation center, 2 is the pitch mechanism, 3 is the front yaw mechanism, and 4 is the rear yaw mechanism. The angle-changing mechanisms in the wind tunnel tail support angle-changing mechanism include: a pitch mechanism, a front sideslip mechanism, and a rear sideslip mechanism.

[0022] In the embodiment of the present invention, the operating range of the variable angle mechanism is evenly divided into a plurality of angle change steps. The number of angle change steps and the angle difference between adjacent angle change steps can be adjusted according to actual needs, such as dividing the operating range of the variable angle mechanism into no less than 10 angle change steps, with the pitch mechanism having one step of 10° each.

[0023] In this embodiment of the present invention, step 11 specifically includes: Determine whether the spatial position information of the identification points of the preset number of positive return strokes of all angle change steps of the angle-changing mechanism has been obtained. If so, go to step 12; if not, go to step 7.

[0024] In the embodiments of the present invention, please refer to Figure 2 , Figure 2 This is the equipment composition diagram of the pitch mechanism control accuracy correction method. Figure 2 In the figure, 5 is a laser tracker, 6 is a marking point, 7 is a second rotation center, and 8 is a driving cylinder. The method uses a laser tracker to obtain spatial position information of the marking point. The laser tracker is a high-precision large-size measuring instrument in an industrial measurement system. It combines various advanced technologies such as laser interferometric ranging technology, photoelectric detection technology, precision mechanical technology, computer and control technology, and modern numerical calculation theory to track spatial moving targets and measure the spatial three-dimensional coordinates of the target in real time. It has the characteristics of high precision, high efficiency, real-time tracking measurement, quick installation, and easy operation, and is suitable for assembly measurement of large-size workpieces.

[0025] Among them, in the embodiment of the present invention, the angle-changing mechanism in the angle-changing mechanism of the wind tunnel tail support is driven by an electric push rod or a hydraulic cylinder. This method is suitable for correcting the control accuracy of the angle control mechanism driven by a linearly running electric push rod or a hydraulic cylinder. Through this correction method, the control accuracy of the angle-changing mechanism caused by the machining and assembly errors of the mechanism can be corrected.

[0026] The present invention proposes a method for correcting the control accuracy of a variable angle mechanism of a wind tunnel tail strut. After the variable angle mechanism of the wind tunnel tail strut is assembled, during the operation and debugging of the variable angle mechanism, a high-precision laser tracker is introduced to measure the spatial position change of marking points set by the variable angle mechanism, so as to obtain the actual angle change in the full range of mechanism operation, compare it with the angle given by the control system, and obtain the error between the actual operating angle of the variable angle mechanism and the angle given by the control system. By performing nonlinear fitting on the error, the control system correction amount in the full range of the variable angle mechanism operation is obtained, thereby improving the control accuracy of the variable angle mechanism of the wind tunnel tail strut.

[0027] This method first uses a laser tracker to obtain the real high-precision actual angle of the variable angle mechanism in the entire operating range to ensure the real error between the real angle of the variable angle mechanism and the given angle of the control system. Then, by using nonlinear fitting for the error obtained by the laser tracker at different control angles, the error correction amount of the variable angle mechanism at different control angles is obtained, and the control target of the control system is corrected by the correction amount, thereby improving the control accuracy of the variable angle mechanism.

[0028] In the method, the control accuracy correction of the pitch mechanism, the front sideslip mechanism and the rear sideslip mechanism of the tail support mechanism angle-changing mechanism is carried out in the same way.

[0029] During the debugging process of the tail support variable angle mechanism after assembly, this method uses a high-precision laser tracker to obtain the high-precision spatial position of the object identification point, and then obtain the high-precision control error during the operation of the variable angle mechanism, providing a reliable basis for subsequent control accuracy correction.

[0030] This method compares the control angle with the actual angle in the motion range of the variable angle mechanism at multiple angle steps, and obtains the control accuracy of the full range of the variable angle mechanism. In addition, in the operating range of the variable angle mechanism, each control angle is operated through multiple forward and reverse return strokes (such as 3), and the laser tracker obtains the high-precision spatial position of multiple (such as 6) actual operating identification points of the forward and reverse operations. The average value of multiple (such as 6) control errors is taken to obtain the average control error of the forward and reverse operation of the variable angle mechanism. The control system is corrected by the average control error, which not only improves the control accuracy of the control system, but also eliminates the influence of the reverse error in the operation of the mechanism on the control accuracy of the tail support variable angle mechanism.

[0031] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0032] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for correcting the control accuracy of a wind tunnel tail support angle-changing mechanism, characterized in that: The wind tunnel tail support angle-changing mechanism is driven by a control system, and the wind tunnel tail support angle-changing mechanism includes a plurality of angle-changing mechanisms. The method includes: Step 1: After completing the assembly of the wind tunnel tail support angle-changing mechanism, adjust all angles of all angle-changing mechanisms in the wind tunnel tail support angle-changing mechanism to the mechanical 0° position, and proceed to step 2; Step 2: The control system divides the operating range of the variable angle mechanism into a number of ordered angle change steps according to the operating range of the variable angle mechanism, obtains an angle sequence, and proceeds to step 3; Step 3: At the mechanical 0° position of the variable angle mechanism, the control system identifies the position as the identification point and the system 0° of the control system, obtains the spatial position information of the identification point when the variable angle mechanism is at the mechanical 0° position, and proceeds to step 4; Step 4: The control system drives the angle-changing mechanism to rotate around the rotation center of the mechanism according to the design dimension data of the angle-changing mechanism, and controls the angle-changing mechanism to run in the positive direction from 0° to the first angle change step in the angle sequence according to the corresponding relationship between the angle type of the angle-changing mechanism and the position of the driving mechanism of the angle-changing mechanism. After the control system controls the angle-changing mechanism to run to the first angle change step, the process goes to step 5; Step 5: Obtain the spatial position information of the identification point when the angle-variable mechanism is at the first angle-variable step, and proceed to step 6; Step 6: The control system controls the driving mechanism of the angle-changing mechanism to run to the driving mechanism position corresponding to the second angle change step in the angle sequence, and then proceeds to step 7; Step 7: Obtain the spatial position information of the identification point when the angle-variable mechanism is in the second angle change step in the angle sequence, and proceed to step 8; Step 8: The control system determines whether the current angle of the variable angle mechanism is the maximum angle or the minimum angle; if so, it proceeds to step 9; if not, it proceeds to step 10; Step 9: The control system drives the angle-changing mechanism to run in reverse to the next angle change step in the angle sequence relative to the angle change step in step 7, enters step 7 and updates the angle change step of the angle-changing mechanism in step 7 to the current angle change step; Step 10: The control system controls the angle-variable mechanism driving mechanism to move to a driving mechanism position corresponding to the next angle change step in the angle sequence relative to the angle change step in step 7, and then proceeds to step 11; Step 11: Determine whether the spatial position information of the identification points corresponding to the preset required number of angle change steps has been obtained. If so, proceed to step 12; if not, proceed to step 7 and update the angle change steps of the angle changing mechanism in step 7 to the current angle change steps; Step 12: Match all the spatial position information of the acquired identification points with the given angle of the control system, obtain the control error corresponding to each angle change step of the angle-variable mechanism, and proceed to step 13; Step 13: Take the average value of the control errors corresponding to each angle change step of the variable angle mechanism to obtain the average control error corresponding to each angle change step, and proceed to step 14; Step 14: Determine whether the average control error meets the control error requirement of the variable angle mechanism. If so, proceed to step 17; if not, proceed to step 15; Step 15: Taking the angle change steps of the variable angle mechanism as the horizontal coordinate and the average control error corresponding to the angle change steps of the variable angle mechanism as the vertical coordinate, multiple polynomial fittings are performed on the average control error to obtain the angle control error correction formula within the operating range of the variable angle mechanism, and then proceed to step 16; Step 16: In the control system, the angle control of the variable angle mechanism is corrected by using the obtained angle control error correction formula, and the process goes to step 2; Step 17: Use the current control parameters to achieve angle control of the variable angle mechanism and complete parameter optimization.

2. A method for correcting the control accuracy of a wind tunnel tail strut angle-changing mechanism according to claim 1, characterized in that: The angle-changing mechanism in the wind tunnel tail support angle-changing mechanism comprises: a pitch mechanism, a front sideslip mechanism and a rear sideslip mechanism.

3. The method for correcting the control accuracy of the wind tunnel tail strut angle-changing mechanism according to claim 1 is characterized in that: The operating range of the angle-changing mechanism is evenly divided into a number of orderly angle-changing steps.

4. A method for correcting the control accuracy of a wind tunnel tail strut angle-changing mechanism according to claim 1, characterized in that: The method uses a laser tracker to obtain the spatial position information of the marking point.

5. The method for correcting the control accuracy of the wind tunnel tail strut angle-changing mechanism according to claim 1 is characterized in that: The angle-changing mechanism in the wind tunnel tail support angle-changing mechanism is driven by an electric push rod or a hydraulic cylinder.

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