A force applying assembly and method for a half die balance calibration system

Abstract

The application belongs to the technical field of wind tunnel test, and discloses a force applying assembly and a force applying method of a semi-mould balance calibration system. The force applying assembly applies force and moment load to the semi-mould balance and a loading head, the coordinate origin is located at the design calibration center of the loading head, the X axis is backward along the balance axis, the Y axis is upward, and the Z axis is leftward. The force applying device acting on the semi-mould balance and the loading head comprises positive Y direction, negative Y direction, positive Z direction and negative Z direction force applying devices, and 12 force applying devices are symmetrically distributed in up-down and left-right directions. The force applying method adjusts the force applying points of the force applying devices to realize the coincidence of the design calibration center of the loading head and the loading center of the force applying device. Constant force value output is realized through each force applying device to realize accurate loading. The force applying assembly and the force applying method of the semi-mould balance calibration system of the application ensure the accuracy of the calibration data of the semi-mould balance, and have engineering practical value.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind tunnel test, and particularly relates to a force applying assembly and a force applying method of a half-model balance calibration system. BACKGROUND

[0002] The half-model balance calibration system generally adopts a ground shaft calibration mode, and the ground shaft calibration mode does not reset during calibration loading, and requires that the balance loading head calibration center and the force applying device loading center must be strictly consistent, otherwise the force applying devices distributed around will generate additional force and torque due to azimuth error when the load is applied, the additional force and torque acting on the balance to be calibrated will introduce an additional error source, resulting in that the finally fitted balance calibration formula is not accurate enough. Therefore, ensuring that the balance loading head calibration center and the force applying device loading center coincide is one of the important works in the half-model balance calibration process.

[0003] At present, it is urgent to develop a force applying assembly and a force applying method of a half-model balance calibration system. SUMMARY

[0004] One of the technical problems to be solved by the application is to provide a force applying assembly of a half-model balance calibration system, and another technical problem to be solved by the application is to provide a force applying method of a half-model balance calibration system, so as to overcome the defects of the prior art.

[0005] The force applying assembly of the half-model balance calibration system, the force applying assembly applies force and torque load to the half-model balance through a loading head, a coordinate origin is located at a design calibration center of the loading head, a connecting device of the loading head and the half-model balance is adjusted, so that the design calibration center of the loading head and the calibration center of the half-model balance coincide, an X-axis is backward along a balance axis, a Y-axis is upward, and a Z-axis is leftward; a force applying device acting on the loading head includes a positive Y-direction force applying device, a negative Y-direction force applying device, a positive Z-direction force applying device and a negative Z-direction force applying device.

[0006] There are 12 force applying devices; the positive Y direction force applying devices include 4 force applying devices, numbered as force applying device Y1~force applying device Y4, the force applying point of force applying device Y1 and the force applying point of force applying device Y3 are symmetrically arranged about XOY plane with the force applying point of force applying device Y2 and the force applying point of force applying device Y4; the negative Y direction force applying devices include 4 force applying devices, numbered as force applying device Y5~force applying device Y8, force applying device Y5~force applying device Y8 correspond to force applying device Y1~force applying device Y4 one by one, and are symmetrically arranged about XOZ plane; the positive Z direction force applying devices include 2 force applying devices, numbered as force applying device Z1, force applying device Z2, the force applying point of force applying device Z2 and the force applying point of force applying device Z2 are symmetric about YOZ plane; the negative Z direction force applying devices also include 2 force applying devices, numbered as force applying device Z3, force applying device Z4, the force applying point of force applying device Z3 and the force applying point of force applying device Z4 correspond to the force applying point of force applying device Z1 and the force applying point of force applying device Z2 one by one, and are symmetric about XOY plane.

[0007] Further, the force applying device is a weightless force source system based on an electric cylinder, which maintains constant force value output; the force applying device includes a two-dimensional moving table, an electric cylinder, a tension spring, a force multiplier pulley and a steel belt, and a force sensor is arranged on the steel belt.

[0008] Further, the two-dimensional moving table is composed of a floating plate, an X direction base, a Z direction base, a mounting base plate, guide rails, a lead screw and a grating ruler;

[0009] The mounting base plate is connected and fixed with foundation anchor bolts reserved on the foundation; the Z direction base is fixed on the upper surface of the mounting base plate, the lead screw is arranged on the central axis of the upper surface of the Z direction base, two guide rails are symmetrically arranged on the left and right sides, the X direction base is clamped on the two guide rails, the X direction base is driven to move along the guide rails by the lead screw, so that the X direction base moves forward and backward along the X axis; similarly, the floating plate is clamped on the upper surface of the X direction base through corresponding guide rails, and the floating plate is driven to move along the corresponding guide rails through the corresponding lead screw, so that the floating plate moves left and right along the Z axis.

[0010] The floating plate drives the force applying device to move in the XZ plane under the cooperation of the Z direction base and the X direction base, and the X axis displacement and the Z axis displacement of the force applying point of the force applying device are measured by the grating ruler; the grating ruler is fixed on the upper surface of the Z direction base.

[0011] The force applying method of the half-mould balance calibration system of the application comprises the following steps:

[0012] S10. Adjusting the force applying point of the force applying device;

[0013] The design calibration center of the loading head is taken as the symmetry center of the force applying assembly of the half-mold balance calibration system, the target positions of the force applying points of each force applying device are calculated, the force applying points of each force applying device are adjusted to the target positions through two-dimensional moving table in a way of grating ruler measurement and manual adjustment of workers, and the design calibration center of the loading head is overlapped with the loading center of the force applying device.

[0014] S20. The position of the force applying point is calibrated by using a laser tracker.

[0015] Before the test, the position of each force applying point is calibrated by using a laser tracker, and workers continue to manually adjust to ensure that the intersection point of the 12 force applying points is overlapped with the design calibration center of the loading head and the calibration center of the half-mold balance.

[0016] S30. Each force applying device outputs a constant force value.

[0017] Firstly, the target force value of each force applying device is given by the half-mold balance calibration system and sent to the corresponding PLC control system, and the displacement amount required to be run is calculated according to the stiffness coefficient of the tension spring; then the displacement amount is sent to the electric cylinder, and after the electric cylinder runs the corresponding displacement amount; finally, the real-time force value is collected by the force sensor, and the real-time force value is compared with the target force value, if the difference between the two is within the pre-set threshold range, the electric cylinder stops running, otherwise the difference is taken as a new target force value and sent to the PLC control system again, and the iteration is continued until the difference between the real-time force value and the new target force value is within the pre-set threshold range, so as to realize accurate loading of the force applying device.

[0018] The force applying assembly of the half-mold balance calibration system takes the design calibration center of the balance loading head as the coordinate origin, and sets 12 force applying devices symmetrically distributed upward, downward, leftward, rightward, forward and backward; the force applying method adjusts the force applying points of the force applying devices to realize the coincidence of the design calibration center of the balance loading head and the loading center of the force applying device; the constant force value output of each force applying device realizes accurate loading; and the calibration data accuracy of the half-mold balance is ensured, which has engineering practical value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the force applying assembly of the half-mold balance calibration system of the application;

[0020] Figure 2 It is a force applying layout schematic view of the force applying assembly of the half-mold balance calibration system of the application;

[0021] Figure 3 It is a structural schematic view of the force applying device in the force applying assembly of the half-mold balance calibration system of the application;

[0022] Figure 4aThis is a schematic diagram (front view) of the two-dimensional moving stage of the force application device in the force application component of the semi-mold balance calibration system of the present invention.

[0023] Figure 4b This is a schematic diagram (right view) of the two-dimensional moving stage of the force-applying device in the force-applying component of the semi-mold balance calibration system of the present invention.

[0024] Figure 4c This is a top view of the two-dimensional moving stage of the force application device in the force application component of the semi-mold balance calibration system of the present invention.

[0025] Figure 4d This is a schematic diagram (axonometric view) of the two-dimensional moving stage of the force-applying device in the force-applying component of the semi-mold balance calibration system of the present invention.

[0026] In the diagram, 11. Loading head; 12. Positive Z-axis force application device; 13. Positive Y-axis force application device; 14. Negative Z-axis force application device; 15. Negative Y-axis force application device;

[0027] 21. Two-dimensional moving stage; 22. Electric cylinder; 23. Tension spring; 24. Force-multiplying pulley; 25. Force sensor; 26. Steel belt;

[0028] 31. Floating plate; 32. X-axis base; 33. Z-axis base; 34. Mounting base plate; 35. Guide rail; 36. Lead screw; 37. Grating ruler. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Example: Figure 1 As shown, the force application component of the semi-mold balance calibration system in this embodiment applies force and torque load to the semi-mold balance through the loading head 11. The coordinate origin is located at the design calibration center of the loading head 11. The connection device between the loading head 11 and the semi-mold balance is adjusted so that the design calibration center of the loading head 11 coincides with the calibration center of the semi-mold balance. The X-axis is backward along the balance axis, the Y-axis is upward, and the Z-axis is left. The force application device acting on the loading head 11 includes a positive Y-axis force application device 13, a negative Y-axis force application device 15, a positive Z-axis force application device 12, and a negative Z-axis force application device 14.

[0031] There are a total of 12 force-applying devices; such as Figure 2As shown, the positive Y-direction force applying device 13 includes 4 force applying devices, numbered as force applying device Y1~force applying device Y4, the force applying point of force applying device Y1 and the force applying point of force applying device Y3 are symmetrically arranged about XOY plane with the force applying point of force applying device Y2 and the force applying point of force applying device Y4; the negative Y-direction force applying device 15 includes 4 force applying devices, numbered as force applying device Y5~force applying device Y8, force applying device Y5~force applying device Y8 correspond to force applying device Y1~force applying device Y4 respectively, and are symmetrically arranged about XOZ plane; the positive Z-direction force applying device 12 includes 2 force applying devices, numbered as force applying device Z1, force applying device Z2, the force applying point of force applying device Z2 and the force applying point of force applying device Z2 are symmetric about YOZ plane; the negative Z-direction force applying device 14 also includes 2 force applying devices, numbered as force applying device Z3, force applying device Z4, the force applying point of force applying device Z3 and the force applying point of force applying device Z4 correspond to the force applying point of force applying device Z1 and the force applying point of force applying device Z2 respectively, and are symmetric about XOY plane.

[0032] Further, as shown in the figure, Figure 3 The force applying device is a weightless force source system based on the electric cylinder 22, which maintains constant force value output; the force applying device includes sequentially connected two-dimensional moving table 21, electric cylinder 22, tension spring 23, force multiplier pulley 24, steel belt 26, and force sensor 25 arranged on the steel belt 26.

[0033] Further, as shown in the figure, Figures 4a to 4d The two-dimensional moving table 21 is composed of floating plate 31, X-direction base 32, Z-direction base 33, mounting bottom plate 34, guide rail 35, lead screw 36 and grating ruler 37;

[0034] The mounting bottom plate 34 is connected and fixed with the foundation bolt reserved on the foundation; the Z-direction base 33 is fixed on the upper surface of the mounting bottom plate 34, the lead screw 36 is arranged on the central axis of the upper surface of the Z-direction base 33, two guide rails 35 are symmetrically arranged on the left and right sides, the X-direction base 32 is clamped on the two guide rails 35, the X-direction base 32 is driven by the lead screw 36 to move along the guide rail 35, realizing the movement of the X-direction base 32 along the X-axis; similarly, the floating plate 31 is clamped on the upper surface of the X-direction base 32 through the corresponding guide rail 35, and the floating plate 31 is driven by the corresponding lead screw 36 to move along the corresponding guide rail 35, realizing the movement of the floating plate 31 along the Z-axis;

[0035] The floating plate 31 drives the force applying device to move in the XZ plane under the cooperation of the Z-direction base 33 and the X-direction base 32, and the X-axis displacement and the Z-axis displacement of the force applying point of the force applying device are measured by the grating ruler 37; the grating ruler 37 is fixed on the upper surface of the Z-direction base 33.

[0036] The force applying method of the semi-mold balance calibration system of the embodiment includes the following steps:

[0037] S10. Adjust the force point of the force device;

[0038] With the design calibration center of the loading head 11 as the symmetry center of the force assembly of the half-mold balance calibration system, the target position of the force point of each force device is calculated, and the force point of each force device is adjusted to the target position through two-dimensional moving table 21 in the way of grating ruler 37 measurement and manual adjustment of the staff, so as to realize the coincidence of the design calibration center of the loading head 11 and the loading center of the force device;

[0039] S20. Calibrate the position of the force point by using a laser tracker;

[0040] Before the test, the position of each force point is calibrated by using a laser tracker, and the staff continues to manually adjust to ensure that the intersection point of the 12 force points coincides with the design calibration center of the loading head 11 and the calibration center of the half-mold balance;

[0041] S30. Each force device outputs a constant force value;

[0042] Firstly, the target force value of each force device is given by the half-mold balance calibration system and sent to the corresponding PLC control system, and the displacement amount required to be run is calculated according to the stiffness coefficient of the tension spring 23; then the displacement amount is sent to the electric cylinder 22, and after the electric cylinder 22 runs the corresponding displacement amount; finally, the real-time force value is collected by the force sensor 25, and the real-time force value is compared with the target force value, if the difference between the two is within the pre-set threshold range, the electric cylinder 22 stops running, otherwise the difference is taken as a new target force value and sent to the PLC control system again, and the iteration is continued until the difference between the real-time force value and the new target force value is within the pre-set threshold range, so as to realize the accurate loading of the force device.

[0043] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and the embodiments, and all the features disclosed in the present application, or the steps in all the methods or processes disclosed in the present application, except for the mutually exclusive features and / or steps, can be combined in any way, and the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A force application component of a semi-mode balance calibration system, characterized in that, The force application component applies force and torque load to the half-mold balance through the loading head (11). The origin of the coordinate system is located at the design calibration center of the loading head (11). The connection device between the loading head (11) and the half-mold balance is adjusted so that the design calibration center of the loading head (11) coincides with the calibration center of the half-mold balance. The X-axis is backward along the balance axis, the Y-axis is upward, and the Z-axis is left. The force application device acting on the loading head (11) includes a positive Y-axis force application device (13), a negative Y-axis force application device (15), a positive Z-axis force application device (12), and a negative Z-axis force application device (14). There are a total of 12 force-applying devices; the positive Y-direction force-applying device (13) includes 4 force-applying devices, numbered as force-applying device Y1 to force-applying device Y4. The force-applying points of force-applying device Y1 and force-applying device Y3 are symmetrically arranged with respect to the XOY plane with respect to the force-applying points of force-applying device Y2 and force-applying device Y4. The negative Y-direction force-applying device (15) includes 4 force-applying devices, numbered as force-applying device Y5 to force-applying device Y8. Force-applying devices Y5 to force-applying device Y8 correspond one-to-one with force-applying devices Y1 to force-applying device Y4 respectively. The positive Z-direction force application device (12) includes two force application devices, numbered as force application device Z1 and force application device Z2. The force application points of force application device Z1 and force application device Z2 are symmetrical about the YOZ plane. The negative Z-direction force application device (14) also includes two force application devices, numbered as force application device Z3 and force application device Z4. The force application points of force application device Z3 and force application device Z4 correspond one-to-one with the force application points of force application device Z1 and force application device Z2, and are symmetrical about the XOY plane. The force application device is a weightless force source system based on an electric cylinder (22) that maintains a constant force output. The force application device includes a two-dimensional moving stage (21), an electric cylinder (22), a tension spring (23), a force-multiplying pulley (24), and a steel belt (26) connected in sequence. A force sensor (25) is installed on the steel belt (26). The two-dimensional moving stage (21) consists of a floating plate (31), an X-axis base (32), a Z-axis base (33), a mounting base plate (34), a guide rail (35), a lead screw (36), and a grating ruler (37); The mounting base plate (34) is connected and fixed to the anchor bolts reserved on the foundation; the Z-axis base (33) is fixed on the upper surface of the mounting base plate (34), and a screw (36) is arranged on the central axis of the upper surface of the Z-axis base (33). Two guide rails (35) are symmetrically arranged on the left and right sides. The X-axis base (32) is mounted on the two guide rails (35). The screw (36) drives the X-axis base (32) to move along the guide rail (35), so as to realize the X-axis base (32) moving back and forth along the X-axis. Similarly, the floating plate (31) is mounted on the upper surface of the X-axis base (32) through the corresponding guide rail (35). The floating plate (31) is driven to move along the corresponding guide rail (35) through the corresponding screw (36), so as to realize the floating plate (31) moving left and right along the Z-axis. The floating plate (31) drives the force application device to move in the XZ plane with the cooperation of the Z-axis base (33) and the X-axis base (32). The X-axis displacement and Z-axis displacement of the force application point of the force application device are measured by the grating ruler (37). The grating ruler (37) is fixed on the upper surface of the Z-axis base (33).

2. A force application method for a semi-mode balance calibration system, used in the force application component of the semi-mode balance calibration system of claim 1, comprising the following steps: S10. Adjust the force application point of the force application device; Using the design calibration center of the loading head (11) as the symmetry center of the force application component of the semi-mode balance calibration system, calculate the target position of the force application point of each force application device. Using the method of measuring with a grating ruler (37) and manually adjusting by the staff, adjust the force application point of each force application device to the target position through a two-dimensional moving stage (21) so that the design calibration center of the loading head (11) coincides with the loading center of the force application device. S20. Use a laser tracker to calibrate the position of the force application point; Before the test, the position of each force application point was calibrated using a laser tracker, and the staff continued to manually adjust it to ensure that the intersection of the 12 force application points coincided with the design calibration center of the loading head (11) and the calibration center of the half-mold balance. S30. Each force-applying device outputs a constant force value; First, the semi-mold balance calibration system provides the target force value of each force-applying device and sends it to the corresponding PLC control system. The system calculates the required displacement based on the spring constant of the tension spring (23). Then, the displacement is sent to the electric cylinder (22). After the electric cylinder (22) moves the corresponding displacement, the force sensor (25) collects the real-time force value and compares it with the target force value. If the difference between the two is within the preset threshold range, the electric cylinder (22) stops running. Otherwise, the difference is sent to the PLC control system as a new target force value. The process iterates until the difference between the real-time force value and the new target force value is within the preset threshold range, thus achieving precise loading of the force-applying device.

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