Slender structure space transformation device for wind tunnel laboratory

Abstract

The invention provides a slender structure space transformation device for a wind tunnel laboratory, and belongs to the technical field of wind tunnel experiments, the slender structure space transformation device comprises a multi-axis frame, a suspension assembly, a three-axis servo motor, a plurality of encoders and a central control system, and the multi-axis frame has rotation freedom degrees around the X-axis direction, the Y-axis direction and the Z-axis direction of a three-dimensional coordinate system; the suspension assembly is connected to the inner side wall of the multi-shaft frame and used for being connected with a to-be-tested test model in a suspension mode. The three-axis servo motor is used for correspondingly driving the multi-axis frame to rotate; a plurality of encoders are correspondingly connected with the three-axis servo motor and receive rotation angle signals; the central control system is electrically connected with the three-axis servo motor and the encoders, and the central control system is suitable for controlling the three-axis servo motor to operate so as to accurately adjust the space attitude of the test model. The slender structure spatial transformation device for the wind tunnel laboratory has the technical effects that the attitude adjustment precision of a slender structure in a wind tunnel experiment is high, the adjustment is simple, and the attitude of a test model can be accurately controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel experiments, and more specifically, relates to a slender structure space transformation device for a wind tunnel laboratory. Background Art

[0002] Wind tunnel experiments are an important means of aerodynamic research, which studies the fluid behavior of objects by simulating air flow conditions. In a wind tunnel, the posture and position of the test model are key factors affecting the test results, especially when studying slender structures (such as bridge structures or aerospace components), it is particularly important to accurately control their angles in three-dimensional space.

[0003] In the prior art, mechanical rotating mechanisms, manual adjustment platforms, mechanical universal joint frames and six-degree-of-freedom motion platforms are used to adjust the posture and position of the test model. Among them, the mechanical rotating mechanism is used in most existing wind tunnel experiments to change the angle of the test model. Usually, mechanical components such as gears, chains, and bearings are used to achieve single-axis or dual-axis rotation adjustment of the test model. The advantages of this adjustment method are simplicity and low cost, but the disadvantages are low control accuracy, complex operation, and poor multi-axis linkage. The manual adjustment platform changes the angle of the test model by manual operation, and usually requires the operator to manually adjust the angle and then lock it. The disadvantages of this method are that the adjustment is not accurate enough, the repeatability is poor, and it is very inconvenient for multi-angle research on slender structures, especially when the angle needs to be adjusted multiple times. The efficiency is low. The mechanical universal joint frame is connected by multiple universal joints and joints to achieve multi-directional degree of freedom adjustment. Different joints can be controlled by manual or simple mechanical drive to enable the slender square column to achieve different angles of rotation and tilt. The advantage of this method is that it can achieve flexible multi-directional adjustment and the manufacturing cost is medium. The disadvantages are that, on the one hand, due to the mechanical adjustment method, its control is not precise and linkage control is difficult; on the other hand, although it can provide multi-directional adjustment, it has great limitations in precise three-dimensional spatial posture control, and it is difficult to meet the high-precision requirements for slender structures in wind tunnel experiments. Six-degree-of-freedom motion platforms (such as Stewart platforms) are used in some high-precision research to control the posture of test models in wind tunnel experiments. Stewart platforms can achieve precise movement of test models in six degrees of freedom and can complete complex posture adjustments. However, the platform system is complex and expensive, which exceeds the actual needs for structures such as slender square columns, and the platform equipment maintenance cost is high.

[0004] In summary, traditional wind tunnel experiments often use manual adjustment or simple mechanical adjustment to change the angle of the model. These methods have problems such as insufficient precision, cumbersome adjustment, and difficulty in repeatable control. In order to improve the accuracy and efficiency of wind tunnel experiments, it is very necessary to develop a system or equipment that can automatically, intelligently, and accurately control the test model's posture. Summary of the invention

[0005] The purpose of the present invention is to provide a slender structure space transformation device for a wind tunnel laboratory, aiming to solve the technical problems of insufficient precision, cumbersome adjustment and difficult repeatable control in the posture adjustment method of the slender structure in the wind tunnel experiment.

[0006] To achieve the above object, the technical solution adopted by the present invention is: to provide a slender structure space transformation device for a wind tunnel laboratory, comprising: A multi-axis frame having rotational freedom about the X-axis, Y-axis and Z-axis of a three-dimensional coordinate system; A suspension assembly, connected to the inner wall of the multi-axis frame, and used for suspending and connecting a test model to be tested; A three-axis servo motor includes an X-axis servo motor, a Y-axis servo motor, and a Z-axis servo motor, which are respectively used to drive the multi-axis frame to rotate around the X-axis, the Y-axis, and the Z-axis; A plurality of encoders are respectively and electrically connected to the X-axis servo motor, the Y-axis servo motor and the Z-axis servo motor, and receive rotation angle signals respectively; A central control system is electrically connected to the three-axis servo motor and the plurality of encoders, and the central control system is suitable for controlling the operation of the three-axis servo motor to accurately adjust the spatial posture of the test model.

[0007] In a possible implementation, the multi-axis framework includes: Base; An outer ring, the outer side wall of which is rotatably connected to the base, the outer ring has a degree of freedom of rotation about the Y axis, and the inner side wall of the outer ring is provided with a slideway along its circumference; A middle ring is arranged inside the outer ring, the outer diameter of the middle ring is smaller than the inner diameter of the outer ring, the middle ring is coaxially arranged with the outer ring, the middle ring is slidably connected with the slideway, and the middle ring rotates circumferentially inside the outer ring to form a rotational freedom around the X-axis; The inner ring is arranged inside the middle ring, the inner ring is rotatably connected to the inner wall of the middle ring, the inner ring rotates inside the middle ring to form a rotational freedom around the Z axis, and the suspension assembly is connected to the inner wall of the inner ring.

[0008] In a possible implementation, two groups of sliders are evenly distributed on the outer wall of the middle ring, and the two groups of sliders are respectively located at two ends of the middle ring. The two groups of sliders are slidably connected to the slideway, and the position of the slider after sliding in the slideway can be locked.

[0009] In a possible implementation, the outer wall of the inner ring is connected to two sets of rotating disks, one end of the rotating disk has the freedom to rotate circumferentially relative to the other end thereof, one end of the rotating disk is connected to the inner wall of the middle ring, and the other end is connected to the outer wall of the inner ring.

[0010] In a possible implementation, the inner ring includes two arc-shaped plates with the same structure and both are arc-shaped. The two arc-shaped plates can form a circular ring and the axial direction of the circular ring is set at an acute angle or an obtuse angle with the axial direction of the middle ring. The two groups of rotating disks are respectively connected to one end of the two arc-shaped plates close to the middle ring, and the other ends of the two arc-shaped plates extend toward the two ends of the middle ring or the outer ring respectively.

[0011] In a possible implementation, the suspension assembly includes: Two groups of support frames, respectively corresponding to the inner sides of two arc-shaped plates and away from one end of the middle ring or the outer ring, and the two groups of support frames are arranged opposite to each other; A plurality of spring hooks are respectively connected to the ends of the two groups of support frames, and the plurality of spring hooks are used to hang the two ends of the test model.

[0012] In a possible implementation, the X-axis servo motor is connected to the outer wall of the middle ring, and its power output end is connected to the outer ring, and the X-axis servo motor is used to drive the middle ring to rotate in the X-axis direction; the Y-axis servo motor is connected to the upper end of the base, and its power output end is connected to the outer ring, and the Y-axis servo motor is used to drive the outer ring to rotate in the Y-axis direction; the Z-axis servo motor is divided into two groups and is respectively connected to one end of the two arc plates close to the middle ring, and its power output end is connected to the middle ring, and the Z-axis servo motor is used to drive the inner ring to rotate in the Z-axis direction.

[0013] In a possible implementation, the base includes two groups of spaced-apart supports, the two ends of the outer side wall of the outer ring are rotatably connected to the upper ends of the two groups of supports, and the Y-axis servo motors are two groups and are respectively arranged at the upper ends of the two groups of supports and are suitable for driving the outer ring to rotate.

[0014] In a possible implementation, the inner side walls of the two arc-shaped plates are provided with a slide groove along the arc direction, and the two groups of suspension components are slidably connected to the slide groove at one end away from the test model. The suspension components can slide and limit in the slide groove to adjust the posture of the test model.

[0015] In a possible implementation, the base is equipped with a counterweight block, and the weight of the counterweight block is adjustable.

[0016] The beneficial effect of the slender structure space transformation device for a wind tunnel laboratory provided by the present invention is that: compared with the prior art, the slender structure space transformation device for a wind tunnel laboratory provided by the present invention comprises a multi-axis frame, a suspension assembly, a three-axis servo motor, a plurality of encoders and a central control system, the multi-axis frame has rotational freedom in the X-axis direction, the Y-axis direction and the Z-axis direction respectively around the three-dimensional coordinate system; the suspension assembly is connected to the inner side wall of the multi-axis frame, and is used for suspending and connecting the test model to be tested; the three-axis servo motor comprises an X-axis servo motor, a Y-axis servo motor and a Z-axis servo motor, and is used for correspondingly driving the multi-axis frame to rotate around the X-axis direction, the Y-axis direction and the Z-axis direction respectively. Axial rotation and Z-axis rotation; multiple encoders are electrically connected to the X-axis servo motor, Y-axis servo motor and Z-axis servo motor respectively, and receive rotation angle signals respectively; the central control system is electrically connected to the three-axis servo motor and multiple encoders, and the central control system is suitable for controlling the operation of the three-axis servo motor to accurately adjust the test model's spatial posture, which solves the technical problems of insufficient accuracy, cumbersome adjustment, and difficulty in repeated control in the wind tunnel experiment for adjusting the posture of slender structures. It has the technical effect of high accuracy, simple adjustment, and accurate control of the test model's posture in the wind tunnel experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a slender structure space transformation device for a wind tunnel laboratory provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a slender structure space transformation device for a wind tunnel laboratory provided by another embodiment of the present invention; Figure 3 for Figure 2 A magnified view of the structure at A; Figure 4 A schematic diagram of the connection structure between the inner ring and the middle ring of a slender structure space transformation device for a wind tunnel laboratory provided in an embodiment of the invention.

[0019] Description of reference numerals: 1. Multi-axis frame; 11. Base; 111. Support; 12. Outer ring; 13. Middle ring; 131. Groove; 14. Inner ring; 141. Arc plate; 142. Slideway; 15. Slideway; 16. Slider; 17. Rotating disk; 171. Fixed end; 172. Rotating end; 18. Counterweight; 2. Suspension assembly; 21. Support frame; 22. Spring hook; 3. Three-axis servo motor; 31. X-axis servo motor; 32. Y-axis servo motor; 33. Z-axis servo motor; 4. Central control system. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Please also read Figures 1 to 4 Now, a slender structure space transformation device for a wind tunnel laboratory provided by the present invention is described. The slender structure space transformation device for a wind tunnel laboratory comprises a multi-axis frame 1, a suspension assembly 2, a three-axis servo motor 3, a plurality of encoders and a central control system 4. The multi-axis frame 1 has rotational freedom in the X-axis, Y-axis and Z-axis directions around a three-dimensional coordinate system; the suspension assembly 2 is connected to the inner wall of the multi-axis frame 1 and is used to suspend and connect a test model to be tested (such as Figure 1 The structure is represented by a dotted line in the middle of the figure); the three-axis servo motor 3 includes an X-axis servo motor 31, a Y-axis servo motor 32 and a Z-axis servo motor 33, which are respectively used to drive the multi-axis frame 1 to rotate around the X-axis, the Y-axis and the Z-axis; a plurality of encoders are respectively electrically connected to the X-axis servo motor 31, the Y-axis servo motor 32 and the Z-axis servo motor 33, and respectively receive rotation angle signals to ensure high precision of angle adjustment; a central control system 4 is electrically connected to the three-axis servo motor 3 and a plurality of encoders, and the central control system 4 is suitable for controlling the operation of the three-axis servo motor 3 to accurately adjust the spatial posture of the test model.

[0022] The present invention provides a slender structure space transformation device for a wind tunnel laboratory. Compared with the prior art, the device can realize rotation in the X-axis, Y-axis and Z-axis directions by setting a multi-axis frame 1 to adjust the posture of the test model. The rotation angle can be accurately controlled by an encoder, and the three-axis servo motor 3 can be electronically controlled by a central control system 4, which solves the technical problems of insufficient precision, cumbersome adjustment, and difficulty in repeated control in the method and method for adjusting the posture of the slender structure in the wind tunnel experiment. The device has the technical effects of high precision, simple adjustment, and accurate control of the posture of the test model in the wind tunnel experiment. The present invention can provide three-dimensional all-round precise adjustment suitable for slender structures, and is suitable for complex experiments in wind tunnels; it can reduce the complexity of experimental operations and human participation, improve adjustment accuracy and experimental efficiency; it can also maintain low cost and compact size, and adapt to the limited space of wind tunnel laboratories.

[0023] The present invention constructs a multi-axis frame 1 similar to a gyroscope by setting a combination of a three-axis servo motor 3 and a high-precision encoder, which can ensure that slender structures such as slender square columns can rotate and tilt in all directions in a spherical space. The present invention can adapt to wind tunnel experiments of test models of different sizes. The operation of the three-dimensional servo motor can be accurately controlled by the central control system 4, and the posture can be automatically set to improve the accuracy and experimental efficiency. The coordinate system used in the present invention is a Cartesian three-dimensional coordinate system. The encoder and the central control system 4 used in this embodiment both adopt the existing technology, and after being electrically connected to each other, they can realize accurate control and adjustment of the posture of the test model to achieve accurate experimental results. A plurality of universal wheels are arranged at the bottom end of the base 11, and the universal wheels are used to support the base 11 and enable the base 11 to be moved to any position. The universal wheels can be locked, that is, the position of the base 11 can be fixed.

[0024] In some embodiments, see Figures 1 to 3 The multi-axis frame 1 includes a base 11, an outer ring 12, a middle ring 13 and an inner ring 14. The outer wall of the outer ring 12 is rotatably connected to the base 11. The outer ring 12 has a rotational degree of freedom around the Y axis. The inner wall of the outer ring 12 is provided with a slideway 15 along its circumferential direction; the middle ring 13 is arranged on the inner side of the outer ring 12, the outer diameter of the middle ring 13 is smaller than the inner diameter of the outer ring 12, the middle ring 13 is coaxially arranged with the outer ring 12, the middle ring 13 is slidably connected to the slideway 15, the middle ring 13 rotates circumferentially inside the outer ring 12 to form a rotational degree of freedom around the X axis; the inner ring 14 is arranged on the inner side of the middle ring 13, the inner ring 14 is rotatably connected to the inner wall of the middle ring 13, the inner ring 14 rotates inside the middle ring 13 to form a rotational degree of freedom around the Z axis, and the suspension component 2 is connected to the inner wall of the inner ring 14. The base 11 can play the role of supporting the outer ring 12. If the support stability of the outer ring 12 is good, the structure of the present invention can be relatively stable during the wind tunnel test, and there will be no shaking, tilting, etc., so as not to affect the accuracy of the wind tunnel test. The outer ring 12 and the middle ring 13 are both annular components. By rotating the outer ring 12 on the base 11, the test model can be rotated around the Y axis. The rotation angle of the outer ring 12 is adjustable, and the angle of the outer ring 12 after rotation can be locked. By rotating the middle ring 13 inside the outer ring 12 along the circumference of the outer ring 12, the test model can be rotated around the X axis. At the same time, the rotation angle of the middle ring 13 is adjustable, and the position or angle after rotation can be locked. By rotating the inner ring 14 around the vertical direction (i.e., the Z axis) inside the middle ring 13, the test model can be rotated around the Z axis. The rotation angle is adjustable, and the position or angle after rotation can be locked. The slideway 15 is arranged on the inner wall of the outer ring 12 . The depth direction of the slideway 15 extends radially inwardly of the outer ring 12 and does not penetrate the outer wall of the outer ring 12 .

[0025] Specifically, the structure of the inner ring 14 in this embodiment is different from the structure of the outer ring 12 or the middle ring 13 .

[0026] To achieve the rotation of the middle ring 13 around the X axis, in some embodiments, refer to Figures 1 to 3 , two groups of sliders 16 are evenly distributed on the outer wall of the middle ring 13, and the two groups of sliders 16 are respectively located at the two ends of the middle ring 13. The two groups of sliders 16 are slidably connected to the slideway 15, and the position of the sliders 16 after sliding in the slideway 15 can be locked. As shown in 1, the two groups of sliders 16 are respectively located at the upper end and the lower end of the middle ring 13. When the middle ring 13 rotates, the two groups of sliders 16 also slide in the slideway 15 at the same time, realizing the rotation of the middle ring 13 around the X-axis, thereby adjusting the posture of the test model. The two groups of sliders 16 will not naturally slip out of the slideway 15, and can always maintain the sliding freedom in the slideway 15. If you want to stop the rotation of the middle ring 13, you can lock the sliders 16 in the slideway 15.

[0027] To achieve the rotation of the inner ring 14 around the Z axis, in some embodiments, refer to Figures 1 to 4 , two sets of rotating disks 17 are connected to the outer wall of the inner ring 14, one end of the rotating disk 17 has the freedom to rotate in the circumferential direction relative to the other end thereof, one end of the rotating disk 17 is connected to the inner wall of the middle ring 13, and the other end is connected to the outer wall of the inner ring 14. The rotating disk 17 in this embodiment includes a fixed end 171 and a rotating end 172 that are connected to each other in rotation, the fixed end 171 is connected to the inner wall of the middle ring 13 (a groove 131 is provided on the inner wall, and the fixed end 171 is nested in the groove 131), and the rotating end 172 is annular and connected to the outer wall of the inner ring 14, one end of the Z-axis servo motor 33 is connected to the fixed end 171, and the other end is a power output end and connected to the rotating end 172 and used to drive the rotating end 172 to rotate, thereby driving the inner ring 14 to rotate, so that the inner ring 14 can be rotated around the Z axis relative to the middle ring 13 with the help of the rotating disk 17, and the angle or position after rotation can be locked. In this embodiment, the rotating disk 17 can also be selected from existing technologies, such as a rotating table.

[0028] In some embodiments, see Figures 1 to 3 The inner ring 14 includes two arc-shaped plates 141 of the same structure and both of which are arc-shaped. The two arc-shaped plates 141 can form a circular ring, and the axial direction of the circular ring is set at an acute angle or an obtuse angle with the axial direction of the middle ring 13. The two sets of rotating disks 17 are respectively connected to one end of the two arc-shaped plates 141 close to the middle ring 13, and the other ends of the two arc-shaped plates 141 extend toward the two ends of the middle ring 13 or the outer ring 12. The two arc-shaped plates 141 are arranged opposite to each other and can be rotated by the rotating disks 17 connected to them respectively. The two sets of suspension components 2 are also arranged opposite to each other and can clamp and fix the test model (slender structure). One end of the arc-shaped plate 141 is connected to the rotating disk 17, and the other end is connected to the suspension component 2. The arc extension direction of the arc-shaped plate 141 is toward the direction away from the middle ring 13, that is, the angle between the axial direction of the inner ring 14 and the axial direction of the middle ring 13 is set at an acute angle or an obtuse angle.

[0029] In some embodiments, see Figures 1 to 3 The suspension assembly 2 includes two groups of support frames 21 and a plurality of spring hooks 22. The two groups of support frames 21 are respectively connected to the inner side of two arc-shaped plates 141 and away from the middle ring 13 or the outer ring 12, and the two groups of support frames 21 are arranged opposite to each other; the plurality of spring hooks 22 are respectively connected to the ends of the two groups of support frames 21, and the plurality of spring hooks 22 are used to hang the two ends of the test model. The two groups of support frames 21 have the same structure and are both arranged in a cross shape. The support frames 21 are connected to the arc-shaped plates 141. Four spring hooks 22 are arranged on each group of support frames 21. One end of the spring hooks 22 is connected to the support frames 21, and the other end is used to connect the test model. The test model can be fixed by a plurality of spring hooks 22 so as to conduct wind tunnel experiments.

[0030] If the test model is smaller or shorter, the arc plates 141 with different curvatures can be appropriately selected to reduce the distance between the two sets of support frames 21, so that the smaller test model can be connected. Alternatively, a vertical pole (not shown in the figure) is added between the rotating disk 17 and the arc plate 141, one end of the vertical pole is connected to the rotating disk 17, and the other end is connected to one end of the arc plate 141, so that the distance between the two arc plates 141 can be reduced, so that the smaller test model can be connected and fixed for wind tunnel experiments.

[0031] In some embodiments, see Figures 1 to 4 , the X-axis servo motor 31 is connected to the outer wall of the middle ring 13, and its power output end is connected to the outer ring 12. The X-axis servo motor 31 is used to drive the middle ring 13 to rotate around the X-axis; the Y-axis servo motor 32 is connected to the upper end of the base 11, and its power output end is connected to the outer ring 12. The Y-axis servo motor 32 is used to drive the outer ring 12 to rotate around the Y-axis; the Z-axis servo motor 33 is divided into two groups and is respectively connected to the two arc-shaped plates 141 near one end of the middle ring 13, and its power output end is connected to the middle ring 13. The Z-axis servo motor 33 is used to drive the inner ring 14 to rotate around the Z-axis. The X-axis servo motor 31, the Y-axis servo motor 32 and the Z-axis servo motor 33 are all electrically connected to the central control system 4, and their operation is all controlled by the central control system 4. The present invention adjusts the slender structure (such as a slender square column) at any angle through electric control to achieve any angle spatial transformation in the wind tunnel experiment, which can well simulate the structural stress conditions under various wind field conditions, so as to more comprehensively study and verify the aerodynamic characteristics and stability of the structure. The invention can automatically adjust the angle of the slender structure according to the predetermined test angle requirements, so that the aerodynamic performance of the structure in different postures can be observed and recorded in real time. The invention can be applied to wind tunnel experimental research, including aerodynamic characteristic analysis of bridges, masts, aircraft parts and buildings.

[0032] As a preferred embodiment, the X-axis servo motor 31, the Y-axis servo motor 32 and the Z-axis servo motor 33 are all equipped with a driver (which is the prior art and is not shown in the figure). The advantage is that it can ensure accurate angle control. The driver is connected to the X-axis servo motor 31, the Y-axis servo motor 32 or the Z-axis servo motor 33 through a power supply, and is electrically connected to the central control system 4 through a signal line. The maximum rotation angle and torque limit of the X-axis servo motor 31, the Y-axis servo motor 32 and the Z-axis servo motor 33 are set in the driver, so that it can be ensured that the physical limit is not exceeded during operation to avoid damage to the mechanical structure. The central control system 4 in the present invention is provided with control logic programming. By writing the control logic of the X-axis servo motor 31, the Y-axis servo motor 32 and the Z-axis servo motor 33, each servo motor can act according to the preset order and accuracy. In view of the need for three-dimensional posture changes, the coordinate transformation algorithm of the posture is written on the central control system 4, which has the advantage of ensuring that the actions of the three servo motors can be coordinated and consistent, and realize the linkage change of complex space.

[0033] The present invention implements the three-dimensional angle change of the test model as follows: 1) Posture transformation input and motion path planning Target angle input: The user inputs the target posture angle of the test model through the control interface of the central control system 4 to achieve the rotation angle setting around the X-axis, Y-axis and Z-axis.

[0034] Motion path planning: Based on the input target angle, the central control system 4 will plan a motion path for each servo motor to ensure that the transition process from the current posture to the target posture of the test model is smooth and impact-free.

[0035] 2) Angle linkage control and implementation Stepwise angle transformation: Around the X-axis: The central control system 4 first activates the X-axis servo motor 31, driving the middle ring 13 to drive the slender square column to rotate around the X-axis and rotate horizontally to reach the set angle.

[0036] Around the Z axis: The Z axis servo motor 33 then starts to work, driving the slender square column to rotate around the Z axis.

[0037] Around the Y axis: Finally, the Y axis servo motor 32 starts to work, driving the slender square column to rotate around the Y axis to complete the final posture adjustment.

[0038] Three-axis linkage: If multiple axes need to be adjusted simultaneously, the central control system 4 will synchronously instruct three servo motors (i.e., X-axis servo motor 31, Y-axis servo motor 32, and Z-axis servo motor 33) to achieve complex posture changes through joint driving. In this way, the test model can achieve more natural and realistic spatial posture transformation.

[0039] 3) Real-time feedback and angle correction Real-time encoder feedback: The encoder of each servo motor will feed back the current angle to the central control system 4 in real time. The central control system 4 compares the current angle with the target angle and calculates whether there is an error.

[0040] Error correction and precision adjustment: If there is an error, the central control system 4 will adjust the action of the servo motor in time to correct the angle deviation, so as to ensure that each posture adjustment can achieve the set target posture and achieve high-precision posture changes.

[0041] Specifically, the X-axis servo motor 31, the Y-axis servo motor 32, and the Z-axis servo motor 33 are all set with torque limits and rotation ranges. If resistance exceeding the set torque is encountered during operation, the drive will automatically stop to avoid damage to the mechanical structure. It can avoid exceeding the preset rotation range during operation, avoiding physical collisions and equipment damage.

[0042] In some embodiments, see Figure 1 to Figure 2 The base 11 includes two groups of supports 111 arranged at intervals, and the two ends of the outer wall of the outer ring 12 are respectively rotatably connected to the upper ends of the two groups of supports 111. There are two groups of Y-axis servo motors 32, which are respectively arranged at the upper ends of the two groups of supports 111 and are suitable for driving the outer ring 12 to rotate. The bottoms of the two groups of supports 111 are both triangular, and their upper ends are straight rods, and the upper ends of the straight rods are provided with bearings. The outer wall of the outer ring 12 forms a rotatable connection with the bearing, that is, the outer ring 12 can rotate relative to the support 111. Through the Y-axis servo motor 32, its power output end can pass through the bearing (because the bearing has a cavity inside, that is, pass through the cavity) and connect to the outer ring 12, so that the outer ring 12 can be driven to rotate.

[0043] If the test model can be adjusted in other directions, in some embodiments, see Figure 3 The inner side walls of the two arc-shaped plates 141 are provided with a slide groove 142 along the arc direction thereof, and the ends of the two sets of suspension components 2 away from the test model are slidably connected to the slide groove 142, and the suspension components 2 can slide and limit in the slide groove 142 to adjust the posture of the test model. The slide groove 142 is set at the bottom end of the arc-shaped plate 141, that is, on the inner side wall, and the outer side wall of the support frame 21 is provided with a slide, which can slide in the slide groove 142, and the sliding position can be adjusted and the position after sliding can be limited in the slide groove 142, so that the test model can be adjusted in other directions except the X-axis, Y-axis and Z-axis directions, so as to realize experiments in different postures in wind tunnel experiments.

[0044] Specifically, a top screw (known in the art, not shown in the figure) is passed through the support frame 21 or the slide. By screwing the top screw, the inner end of the top screw can abut against the slideway 15 to lock the position of the support frame 21.

[0045] In some embodiments, see Figure 1 to Figure 2 The base 11 is equipped with a counterweight 18, and the weight of the counterweight 18 can be adjusted. The position where the counterweight 18 is connected to the base 11 can be adjusted. Because the present invention is mainly used in wind tunnel experiments, in order to realize the present invention, the center of gravity can be adjusted to ensure the stability of the multi-dimensional frame at different angles. The counterweight 18 can be set to adjust the center of gravity of the multi-dimensional frame according to the experimental requirements.

[0046] The present invention is suitable for three-dimensional posture adjustment of slender structures, and is mainly used in wind tunnel experiments of special structures such as slender structures. It adopts a multi-dimensional framework similar to a gyroscope to achieve precise posture adjustment in three-dimensional space. The present invention can meet the needs of adjusting the complex posture of slender structures in wind tunnel experiments, and significantly improves adaptability and flexibility. Compared with the shortcomings of the rotation system in the prior art, the present invention uses computer control (i.e., central control system 4) to control the operation of each servo motor, and performs real-time posture feedback through a high-precision encoder, which can not only automatically and accurately control, but also can adjust and record in real time during the experiment, reduce human errors, and improve experimental efficiency and repeatability. Figure 3 The dashed square column structure at the bottom represents the test model.

[0047] The present invention is more suitable for testing models of slender structures. The existing technology mainly targets symmetrical aviation models and has insufficient adaptability. The present invention realizes flexible posture adjustment of slender structures such as slender square columns in three-dimensional space through a specifically designed multi-axis frame 1, which meets the research needs of slender structures.

[0048] The invention has a simple structure, small size and modular design, which makes the integration of wind tunnel equipment more convenient, suitable for limited laboratory space and lower cost. Combined with computer control, it can be remotely automated, reduce the dependence on manpower during the experiment, and improve the experimental efficiency and the reliability of data collection.

[0049] Compared with the complex mechanical structure of conventional or prior art, the present invention adopts a compact and streamlined design to reduce the interference with the air flow in the wind tunnel, making the experimental data more accurate and effective.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A slender structure space transformation device for a wind tunnel laboratory, characterized in that: include: A multi-axis frame having rotational freedom in the X-axis, Y-axis and Z-axis directions around a three-dimensional coordinate system; A suspension assembly, connected to the inner wall of the multi-axis frame, and used for suspending and connecting a test model to be tested; A three-axis servo motor includes an X-axis servo motor, a Y-axis servo motor, and a Z-axis servo motor, which are respectively used to drive the multi-axis frame to rotate around the X-axis, the Y-axis, and the Z-axis; A plurality of encoders are respectively and electrically connected to the X-axis servo motor, the Y-axis servo motor and the Z-axis servo motor, and receive rotation angle signals respectively; A central control system is electrically connected to the three-axis servo motor and the plurality of encoders, and the central control system is suitable for controlling the operation of the three-axis servo motor to accurately adjust the spatial posture of the test model.

2. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 1, characterized in that: The multi-axis framework comprises: Base; An outer ring, the outer side wall of which is rotatably connected to the base, the outer ring has a degree of freedom of rotation about the Y axis, and the inner side wall of the outer ring is provided with a slideway along its circumference; A middle ring is arranged inside the outer ring, the outer diameter of the middle ring is smaller than the inner diameter of the outer ring, the middle ring is coaxially arranged with the outer ring, the middle ring is slidably connected with the slideway, and the middle ring rotates circumferentially inside the outer ring to form a rotational freedom around the X-axis; The inner ring is arranged inside the middle ring, the inner ring is rotatably connected to the inner wall of the middle ring, the inner ring rotates inside the middle ring to form a rotational freedom around the Z axis, and the suspension assembly is connected to the inner wall of the inner ring.

3. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 2, characterized in that: Two groups of sliders are evenly distributed on the outer wall of the middle ring. The two groups of sliders are respectively located at the two ends of the middle ring. The two groups of sliders are slidably connected to the slideway. The position of the slider after sliding in the slideway can be locked.

4. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 2, characterized in that: The outer side wall of the inner ring is connected to two groups of rotating disks, one end of the rotating disk has the freedom to rotate circumferentially relative to the other end thereof, one end of the rotating disk is connected to the inner side wall of the middle ring, and the other end is connected to the outer side wall of the inner ring.

5. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 4, characterized in that: The inner ring includes two arc-shaped plates with the same structure and both are arc-shaped. The two arc-shaped plates can form a circular ring and the axial direction of the circular ring is set at an acute angle or an obtuse angle with the axial direction of the middle ring. The two groups of rotating disks are respectively connected to one end of the two arc-shaped plates close to the middle ring, and the other ends of the two arc-shaped plates extend toward the two ends of the middle ring or the outer ring respectively.

6. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 5, characterized in that: The suspension assembly comprises: Two groups of support frames, respectively corresponding to the inner sides of two arc-shaped plates and away from one end of the middle ring or the outer ring, and the two groups of support frames are arranged opposite to each other; A plurality of spring hooks are respectively connected to the ends of the two groups of support frames, and the plurality of spring hooks are used to hang the two ends of the test model.

7. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 5, characterized in that: The X-axis servo motor is connected to the outer wall of the middle ring, and its power output end is connected to the outer ring. The X-axis servo motor is used to drive the middle ring to rotate in the X-axis direction; the Y-axis servo motor is connected to the upper end of the base, and its power output end is connected to the outer ring. The Y-axis servo motor is used to drive the outer ring to rotate in the Y-axis direction; the Z-axis servo motor is divided into two groups and is respectively connected to one end of the two arc plates close to the middle ring, and its power output end is connected to the middle ring. The Z-axis servo motor is used to drive the inner ring to rotate in the Z-axis direction.

8. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 7, characterized in that: The base includes two groups of spaced-apart supports, the two ends of the outer side wall of the outer ring are rotatably connected to the upper ends of the two groups of supports respectively, and the Y-axis servo motors are in two groups and are respectively arranged at the upper ends of the two groups of supports and are suitable for driving the outer ring to rotate.

9. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 5, characterized in that: The inner side walls of the two arc-shaped plates are provided with sliding grooves along the arc direction thereof, and the ends of the two groups of suspension components away from the test model are slidably connected to the sliding grooves. The suspension components can slide and limit in the sliding grooves to adjust the posture of the test model.

10. The slender structure space transformation device for a wind tunnel laboratory as claimed in claim 2, characterized in that: The base is equipped with a counterweight block, and the weight of the counterweight block can be adjusted.

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