A method for correcting the control accuracy of a variable-angle mechanism of a wind tunnel tail strut

Abstract

The present invention discloses a method for correcting the control precision of a variable-angle mechanism of a wind tunnel tail support, which relates to the field of wind tunnel test control. The variable-angle mechanism of the wind tunnel tail support is driven by a control system. The variable-angle mechanism of the wind tunnel tail support includes a number of variable-angle mechanisms. After the variable-angle mechanism of the wind tunnel tail support is assembled, during the operation and debugging process of the variable-angle mechanism, by introducing a high-precision laser tracker, the spatial position change of the identification points set on the variable-angle mechanism is measured to obtain the actual angle change amount within the full range of the mechanism operation. Then, it is compared with the angle given by the control system to obtain the error between the actual operation angle of the variable-angle mechanism and the angle given by the control system. By performing non-linear fitting on the error, the control system correction amount within the operation range of the variable-angle mechanism is obtained, thereby improving the control precision of the variable-angle mechanism of the wind tunnel tail support.

Description

Technical Field

[0001] The present invention relates to the field of wind tunnel test control, and specifically, to a method for correcting the control accuracy of a variable-angle mechanism of a wind tunnel tail support. Background Art

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

[0003] The variable-angle mechanism of the wind tunnel tail support usually drives each mechanism to rotate around the rotating shaft through a hydraulic cylinder to realize the angle adjustment function of the mechanism. During the design process of the mechanism, there is a fixed corresponding relationship between the angles of each mechanism and the length of the hydraulic cylinder. Through the motion relationship of the mechanism, taking the length of the unilateral hydraulic cylinder of the mechanism as the control object, the precise control of the mechanism angle can be realized. However, in the actual machining and assembly process of the mechanism, due to errors in both machining and assembly, there is a certain error between the control of the mechanism angle relying on the design parameters and the actual operation of the mechanism angle.

[0004] Usually, the control accuracy of the variable-angle mechanism of the tail support ensures the control error of the mechanism through high-precision machining and assembly errors. However, it is often difficult to ensure the machining and assembly errors, and during the maintenance or reassembly process of the mechanism, it is difficult to ensure the repeatability of the assembly error, which results in the uncertainty of 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 purpose of the present invention is to improve the control accuracy of the variable-angle mechanism of the wind tunnel tail support.

[0006] To achieve the above purpose, the present invention provides a method for correcting the control accuracy of a variable-angle mechanism of a wind tunnel tail support. The variable-angle mechanism of the wind tunnel tail support is driven by a control system, and the variable-angle mechanism of the wind tunnel tail support includes several variable-angle mechanisms. The method includes:

[0007] Step 1: After completing the assembly of the variable-angle mechanism of the wind tunnel tail support, adjust all the angles of all the variable-angle mechanisms in the variable-angle mechanism of the wind tunnel tail support to the mechanical 0° position, and enter Step 2;

[0008] 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, and proceeds to Step 3;

[0009] Step 3: At the mechanical 0° position of the variable-angle mechanism, the control system marks this position as the marking point and the system 0° of the control system, obtains the spatial position information of the marking point when the variable-angle mechanism is at the mechanical 0° position, and proceeds to Step 4;

[0010] Step 4: The control system drives the variable-angle mechanism to rotate around the mechanism rotation center according to the design dimension data of the variable-angle mechanism, and controls the variable-angle mechanism to run forward from 0° to the first angle change step in the angle sequence according to the corresponding relationship between the angle type of the variable-angle mechanism and the position of the driving mechanism of the variable-angle mechanism. After the control system controls the variable-angle mechanism to run the first angle change step, proceed to Step 5;

[0011] Step 5: Obtain the spatial position information of the marking point when the variable-angle mechanism is at the first angle change step, and proceed to Step 6;

[0012] Step 6: The control system controls the driving mechanism of the variable-angle mechanism to run to the position of the driving mechanism corresponding to the second angle change step in the angle sequence, and proceeds to Step 7;

[0013] Step 7: Obtain the spatial position information of the marking point when the variable-angle mechanism is at the second angle change step in the angle sequence, and proceed to Step 8;

[0014] 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, proceed to Step 9; if not, proceed to Step 10;

[0015] Step 9: The control system drives the variable-angle mechanism to run in the reverse direction to the next angle change step relative to the angle change step in Step 7, proceeds to Step 7 and updates the angle change step of the variable-angle mechanism in Step 7 to the current angle change step;

[0016] Step 10: The control system controls the driving mechanism of the variable-angle mechanism to run to the position of the driving mechanism corresponding to the next angle change step relative to the angle change step in Step 7, and proceeds to Step 11;

[0017] Step 11: Determine whether the spatial position information of the marking points corresponding to the required number of angle change steps that meet the preset requirements has been obtained. If it has been obtained, proceed to Step 12; if not, proceed to Step 7 and update the angle change step of the variable-angle mechanism in Step 7 to the current angle change step;

[0018] Step 12: Correlate all the spatial position information of the obtained identification points with the angles given by the control system to obtain the control errors corresponding to each angle change step of the variable-angle mechanism, and proceed to Step 13;

[0019] Step 13: Take the average value of the control errors corresponding to each angle change step of the obtained variable-angle mechanism to obtain the average control error corresponding to each angle change step, and proceed to Step 14;

[0020] Step 14: Determine whether the average control error meets the control error requirements of the variable-angle mechanism. If it meets, proceed to Step 17; if not, proceed to Step 15;

[0021] Step 15: Use the angle change steps of the variable-angle mechanism as the abscissa and the average control errors corresponding to the angle change steps of the variable-angle mechanism as the ordinate to perform multiple polynomial fittings on the average control errors to obtain the angle control error correction formula for the operating range of the variable-angle mechanism, and proceed to Step 16;

[0022] Step 16: In the control system, correct the angle control of the variable-angle mechanism through the obtained angle control error correction formula, and proceed to Step 2;

[0023] Step 17: Implement the angle control of the variable-angle mechanism using the current control parameters to complete the parameter optimization.

[0024] Further, the variable-angle mechanism in the wind tunnel tail support variable-angle mechanism includes: a pitching mechanism, a front side-slip mechanism, and a rear side-slip mechanism.

[0025] Further, the operating range of the variable-angle mechanism is evenly divided into a number of ordered angle change steps.

[0026] Further, the method uses a laser tracker to obtain the spatial position information of the identification points.

[0027] Further, the variable-angle mechanism in the wind tunnel tail support variable-angle mechanism is driven by an electric push rod or a hydraulic cylinder.

[0028] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0029] A method for correcting the control accuracy of the variable-angle mechanism of a wind tunnel tail support is proposed in the present invention. After the assembly of the variable-angle mechanism of the wind tunnel tail support is completed, during the operation and debugging process of the variable-angle mechanism, by introducing a high-precision laser tracker, the spatial position changes of the identification points set on the variable-angle mechanism are measured to obtain the actual angle change amount within the full range of the mechanism's operation. By comparing it with the angle given by the control system, the error between the actual operating angle of the variable-angle mechanism and the angle given by the control system is obtained. Through non-linear fitting of the error, the control system correction amount within the full range of the variable-angle mechanism's operation is obtained, thereby improving the control accuracy of the variable-angle mechanism of the wind tunnel tail support. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the present invention, but do not limit the embodiments of the present invention;

[0031] Figure 1 It is a schematic diagram of the composition of the variable-angle mechanism of the wind tunnel tail support;

[0032] Figure 2 It is a composition diagram of the equipment for the method of correcting the control accuracy of the pitching mechanism;

[0033] Among them, 1 is the first rotation center, 2 is the pitching mechanism, 3 is the front yaw mechanism, 4 is the rear yaw mechanism, 5 is the laser tracker, 6 is the identification point, 7 is the second rotation center, and 8 is the driving oil cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0036] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These 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 operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0037] It is understood that the term "a" should be construed as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0038] Embodiment 1;

[0039] Embodiment 1 of the present invention provides a method for correcting the control accuracy of a variable-angle mechanism of a wind tunnel tail support. The variable-angle mechanism of the wind tunnel tail support is driven by a control system. The variable-angle mechanism of the wind tunnel tail support includes a number of variable-angle mechanisms. The method includes:

[0040] Step 1: After completing the assembly of the variable-angle mechanism of the wind tunnel tail support, adjust each angle of all the variable-angle mechanisms in the variable-angle mechanism of the wind tunnel tail support to the mechanical 0° position, and proceed to Step 2; wherein, the mechanical 0° refers to, after the installation of the variable-angle mechanism and the test model is completed, according to the relative angle between the test model and the air flow direction in the test section, defining the air flow direction as the mechanical 0° of the variable-angle mechanism and the test model;

[0041] 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 to obtain an angle sequence. For example, for the pitch angle range of 0 - 90°, there is an angle change step every 10°, and proceed to Step 3; the number of angle change steps is usually greater than 5;

[0042] Step 3: At the mechanical 0° position of the variable-angle mechanism, the control system marks this position as the marking point and the system 0° of the control system, and obtains the spatial position information of the marking point when the variable-angle mechanism is at the mechanical 0° position, and proceed to Step 4;

[0043] Step 4: The control system drives the variable-angle mechanism to rotate around the rotation center of the mechanism according to the design dimension data of the variable-angle mechanism, and controls the variable-angle mechanism to run forward from 0° to the first angle change step in the angle sequence according to the corresponding relationship between the angle type of the variable-angle mechanism and the position of the driving mechanism of the variable-angle mechanism. After the control system controls the variable-angle mechanism to run the first angle change step, proceed to Step 5; wherein, the variable-angle mechanism usually includes a variable pitch angle mechanism and a variable yaw angle mechanism, and the structural dimensions of each mechanism are different. There is a corresponding relationship between the angle type of the variable-angle mechanism and the position of the driving mechanism of the variable-angle mechanism. In this field, the angle positioning control of the variable-angle mechanism can be realized through this corresponding relationship, and this control belongs to the common method in this field, and the present invention embodiment does not elaborate on it accordingly; the control system needs to drive the servo motor or hydraulic cylinder according to the mechanical structure parameters of the variable-angle mechanism to realize the angle positioning control function of the variable-angle mechanism;

[0044] Step 5: Obtain the spatial position information of the identification point when the variable-angle mechanism is at the first angle change step, and proceed to Step 6;

[0045] Step 6: The control system controls the drive mechanism of the variable-angle mechanism to run to the drive mechanism position corresponding to the second angle change step in the angle sequence, and proceed to Step 7;

[0046] Step 7: Obtain the spatial position information of the identification point when the variable-angle mechanism is at the second angle change step in the angle sequence, and proceed to Step 8;

[0047] 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, proceed to Step 9; if not, proceed to Step 10;

[0048] Step 9: The control system drives the variable-angle mechanism to run in the reverse direction to the next angle change step relative to the angle change step in Step 7, proceed to Step 7 and update the angle change step of the variable-angle mechanism in Step 7 to the current angle change step;

[0049] Step 10: The control system controls the drive mechanism of the variable-angle mechanism to run to the drive mechanism position corresponding to the next angle change step relative to the angle change step in Step 7, and proceed to Step 11;

[0050] Step 11: Determine whether the spatial position information of the identification points corresponding to the required number of angle change steps that meet the preset requirements has been obtained. If it has been obtained, proceed to Step 12. If it has not been obtained, proceed 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 from 3 positive-direction changes and 3 reverse-direction changes are used for fitting to obtain the best-fitting data. In this method, the compensation angle runs from 0° step by step (usually not less than 5 steps) to the maximum angle according to the operating range of the mechanism, then runs in the reverse direction to the minimum angle, runs back and forth in the positive and negative directions 3 times, and then obtains 6 correction values at each predetermined step angle position, and uses the average value of the 6 errors for correction.

[0051] Step 12: Correlate all the spatial position information of the obtained identification points with the angles given by the control system to obtain the control errors corresponding to each angle change step of the variable-angle mechanism, and proceed to Step 13; For example, for each angle change step corresponding angle, after 3 positive and negative direction running tests, there are 6 corresponding control errors;

[0052] Step 13: Take the average of the control errors corresponding to each angle change step of the obtained variable-angle mechanism to obtain the average control error corresponding to each angle change step, and proceed to Step 14;

[0053] Step 14: Determine whether the average control error meets the control error requirements of the variable-angle mechanism. If it meets the requirements, proceed to Step 17; if it does not meet the requirements, proceed to Step 15. Generally, the control error requirement of the variable-angle mechanism is better than 0.02°. The accuracy requirements for each set of variable-angle mechanisms may not be the same and can be adjusted according to actual needs.

[0054] Step 15: Take the angle change steps of the variable-angle mechanism as the abscissa and the average control error corresponding to each angle change step of the variable-angle mechanism as the ordinate, and perform multiple polynomial fittings on the average control error to obtain the angle control error correction formula for the operating range of the variable-angle mechanism, and then proceed to Step 16.

[0055] Step 16: In the control system, correct the angle control of the variable-angle mechanism through the obtained angle control error correction formula, and then proceed to Step 2. For example, if each angle change step corresponds to an angle and there are 6 corresponding control errors after 3 forward and reverse operation tests, take the average of the 6 errors. In EXCEL, plot the curve of the data corresponding to the angle and the error, with the horizontal axis being the mechanism angle and the vertical axis being the error. Add a trend line to the curve plotted in EXCEL. The trend line is fitted with a 5th-degree polynomial, and through the displayed formula, obtain the corresponding relationship between the angle of the variable-angle mechanism and the corresponding correction value.

[0056] Step 17: Implement the angle control of the variable-angle mechanism with the current control parameters to complete the parameter optimization.

[0057] Among them, the variable-angle 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 realized through the control system. The control system in the present invention usually includes common hardware and software, which belongs to the existing control system, and the embodiments of the present invention will not elaborate on it accordingly.

[0058] Among them, in the embodiments of the present invention, please refer to Figure 1 , Figure 1 which is a schematic diagram of the composition of the variable-angle mechanism of the wind tunnel tail support. Figure 1 In [the figure], 1 is the first rotation center, 2 is the pitching mechanism, 3 is the front yaw mechanism, and 4 is the rear yaw mechanism. The variable-angle mechanism in the variable-angle mechanism of the wind tunnel tail support includes: a pitching mechanism, a front side-slip mechanism, and a rear side-slip mechanism.

[0059] Among them, in the embodiments of the present invention, the operating range of the variable-angle mechanism is evenly divided into several angle change steps. The number of divided angle change steps and the difference in angles between adjacent angle change steps can be adjusted according to actual needs. For example, the operating range of the variable-angle mechanism is divided into no less than 10 angle change steps, and the pitching mechanism has one step every 10°.

[0060] Among them, in the embodiments of the present invention, step 11 specifically includes:

[0061] Judge whether the preset number of positive and return trips of the identification point spatial position information of all angle change steps of the variable angle mechanism has been obtained. If it has been obtained, proceed to step 12; if not, proceed to step 7.

[0062] Among them, in the embodiments of the present invention, please refer to Figure 2 , Figure 2 which is the composition diagram of the equipment for the pitching mechanism control accuracy correction method. Figure 2 In [the figure], 5 is a laser tracker, 6 is an identification point, 7 is the second rotation center, 8 is a driving oil cylinder, and the method uses the laser tracker to obtain the spatial position information of the identification point. The laser tracker is a high-precision large-size measuring instrument in the industrial measurement system. It combines various advanced technologies such as laser interferometric ranging technology, photoelectric detection technology, precision machinery technology, computer and control technology, and modern numerical calculation theory to track spatial moving targets and measure the three-dimensional spatial coordinates of the targets in real time. It has the characteristics of high precision, high efficiency, real-time tracking measurement, quick installation, and simple operation, and is suitable for the assembly measurement of large-size workpieces.

[0063] Among them, in the embodiments of the present invention, the variable angle mechanism in the wind tunnel tail support variable angle mechanism is driven by an electric push rod or a hydraulic cylinder. This method is applicable to the control accuracy correction of the angle control mechanism driven by a linear running electric push rod or a hydraulic cylinder. Through this correction method, the control accuracy of the variable angle mechanism caused by the machining and assembly errors of the mechanism can be corrected.

[0064] A method for correcting the control accuracy of a wind tunnel tail support variable angle mechanism proposed by the present invention is to introduce a high-precision laser tracker during the operation debugging process of the variable angle mechanism after the wind tunnel tail support variable angle mechanism is assembled, measure the spatial position change of the identification points set on the variable angle mechanism, obtain the actual angle change amount in the full range of the mechanism operation, compare it with the angle given by the control system, and obtain the error between the actual operation angle of the variable angle mechanism and the angle given by the control system. By performing non-linear 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 wind tunnel tail support variable angle mechanism.

[0065] This method first uses a laser tracker to obtain the true high-precision actual angle of the variable angle mechanism in the entire operation range to ensure the true error between the true angle of the variable angle mechanism and the angle given by the control system. Then, by performing non-linear fitting on the errors 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 in the control system is corrected with this correction amount, thereby improving the control accuracy of the variable angle mechanism.

[0066] In this method, the control precision correction of the pitching mechanism, the front side-sliding mechanism, and the rear side-sliding mechanism of the tail support mechanism's variable-angle mechanism adopts the same method.

[0067] During the debugging process after the assembly of the tail support variable-angle mechanism is completed, a high-precision laser tracker is used in this method, which can obtain the high-precision spatial position of the object identification points, and then the high-precision control error during the operation of the variable-angle mechanism can be obtained, providing a reliable basis for the subsequent control precision correction.

[0068] In the motion range of the variable-angle mechanism in this method, the control angle is compared with the actual angle in multiple angle steps, and the control precision of the entire operation range of the variable-angle mechanism is obtained. Moreover, in the motion range of the variable-angle mechanism, for each control angle, it runs through multiple (such as 3) forward and reverse strokes. The laser tracker obtains the high-precision spatial positions of multiple (such as 6) actual operation identification points during the forward and reverse operations. By taking the average of multiple (such as 6) control errors, the average control error of the forward and reverse operations of the variable-angle mechanism is obtained, and the control system is corrected through this average control error. In this way, not only can the control precision of the control system be improved, but also the influence of the reverse error during the mechanism operation on the control precision of the tail support variable-angle mechanism can be eliminated.

[0069] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0070] 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 equivalent technologies, the present invention also intends 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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