An elongated structure space transformation device for a wind tunnel laboratory

Abstract

The application provides a slender structure space transformation device for a wind tunnel laboratory, and belongs to the technical field of wind tunnel experiments.The device comprises a multi-axis frame, a suspension assembly, three-axis servo motors, a plurality of encoders and a central control system.The multi-axis frame has rotational 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-axis frame and is used for suspending a test model to be tested.The three-axis servo motors are used for driving the rotation of the multi-axis frame.The plurality of encoders are connected to the three-axis servo motors and receive rotation angle signals.The central control system is electrically connected to the three-axis servo motors and the plurality of encoders, and is suitable for controlling the operation of the three-axis servo motors to accurately adjust the space posture of the test model.The slender structure space transformation device for the wind tunnel laboratory has the technical effects of high posture adjustment precision, simple adjustment and accurate control of the posture of the test model for the slender structure in the wind tunnel experiment.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel experimental technology, and more specifically, relates to a slender spatial transformation device for wind tunnel laboratories. Background Technology

[0002] Wind tunnel experiments are an important tool in aerodynamics research, simulating airflow conditions to study the fluid behavior of objects. In a wind tunnel, the attitude 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), where precise control of its angles in three-dimensional space is particularly important.

[0003] Existing technologies utilize mechanical rotating mechanisms, manual adjustment platforms, mechanical universal joint frames, and six-degree-of-freedom motion platforms to adjust the attitude and position of test models. Mechanical rotating mechanisms are used in most existing wind tunnel experiments to change the angle of the test model. They typically use mechanical components such as gears, chains, and bearings to achieve single-axis or dual-axis rotation adjustment. This method is simple and low-cost, but suffers from low control precision, complex operation, and poor multi-axis linkage. Manual adjustment platforms change the angle of the test model manually, usually requiring operators to manually adjust and lock the angle. This method is less precise, has poor repeatability, and is inconvenient for multi-angle studies of slender structures, especially when multiple angle adjustments are needed, resulting in low efficiency. Mechanical universal joint frames achieve multi-directional degree-of-freedom adjustment through multiple universal joints and joints. Different joints can be controlled manually or through simple mechanical drives, allowing slender rectangular columns to rotate and tilt at different angles. This method offers the advantage of flexible multi-directional adjustment at a moderate manufacturing cost. The drawbacks are twofold: firstly, due to its mechanical adjustment method, the control is imprecise and linkage control is difficult; secondly, although it can provide multi-directional adjustment, it has significant limitations in precise three-dimensional spatial attitude control, making it difficult to meet the high-precision requirements of slender structures in wind tunnel experiments. Six-DOF motion platforms (such as the Stewart platform) are used in some high-precision research to control the attitude of test models in wind tunnel experiments. The Stewart platform can achieve precise motion of the test model in six degrees of freedom and can complete complex attitude adjustments. However, this platform system is complex and expensive, exceeding practical requirements for structures like slender rectangular columns, and the platform equipment maintenance costs are high.

[0004] In summary, traditional wind tunnel experiments often employ manual or simple mechanical adjustments to change the model's angle. These methods suffer from insufficient precision, cumbersome adjustments, and difficulty in repeatable control. To improve the accuracy and efficiency of wind tunnel experiments, it is essential to develop systems or equipment capable of automating, intelligently controlling, and precisely controlling the attitude of the test model. Summary of the Invention

[0005] The purpose of this invention is to provide a slender structure spatial transformation device for wind tunnel laboratories, which aims to solve the technical problems of insufficient precision, cumbersome adjustment, and difficulty in repeatable control in the methods of adjusting the attitude of slender structures in wind tunnel experiments.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a slender spatial transformation device for a wind tunnel laboratory, comprising:

[0007] The multi-axis frame has rotational degrees of freedom about the X, Y, and Z axes of the three-dimensional coordinate system, respectively.

[0008] A suspension assembly, connected to the inner wall of the multi-axis frame, is used to suspend and connect the test model to be tested.

[0009] The 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.

[0010] Multiple encoders are electrically connected to the X-axis servo motor, the Y-axis servo motor and the Z-axis servo motor respectively, and receive rotation angle signals respectively;

[0011] A central control system is electrically connected to the three-axis servo motor and multiple encoders. The central control system is adapted to control the operation of the three-axis servo motor to precisely adjust the spatial attitude of the test model.

[0012] In one possible implementation, the multi-axis frame includes:

[0013] Base;

[0014] The outer ring and its outer sidewall are rotatably connected to the base. The outer ring has a degree of freedom of rotation about the Y-axis. The inner sidewall of the outer ring is provided with a slide along its circumference.

[0015] A middle ring is located 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 and is slidably connected to the slide rail. The middle ring rotates circumferentially inside the outer ring to form a degree of freedom of rotation about the X-axis.

[0016] An inner ring is located inside the middle ring and is rotatably connected to the inner wall of the middle ring. The inner ring rotates inside the middle ring to form a degree of freedom of rotation about the Z-axis. The suspension assembly is connected to the inner wall of the inner ring.

[0017] In one possible implementation, two sets of sliders are evenly distributed on the outer wall of the middle ring. The two sets of sliders are located at both ends of the middle ring, and both sets of sliders are slidably connected to the slide rail. The position of the slider after sliding in the slide rail can be locked.

[0018] In one possible implementation, the outer wall of the inner ring is connected to two sets of rotating disks, one end of which has a degree of freedom to rotate circumferentially relative to the other end. 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.

[0019] In one possible implementation, the inner ring includes two arc-shaped plates with identical structures, which can form a circular ring with the axis of the circular ring at an acute or obtuse angle to the axis of the middle ring. The two sets of rotating disks are respectively connected to one end of the two arc-shaped plates near 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.

[0020] In one possible implementation, the suspension assembly includes:

[0021] Two sets of support frames are respectively connected to the inner side of the two arc-shaped plates and away from the middle ring or the outer ring, and the two sets of support frames are arranged opposite to each other;

[0022] Multiple spring hooks are respectively connected to the ends of the two sets of support frames, and the multiple spring hooks are used to hang the two ends of the test model.

[0023] In one 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. The X-axis servo motor is used to drive the middle ring to rotate along the X-axis. 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 along the Y-axis. There are two sets of Z-axis servo motors, each connected to one end of the two arc-shaped plates near the middle ring. Their power output ends are connected to the middle ring. The Z-axis servo motors are used to drive the inner ring to rotate along the Z-axis.

[0024] In one possible implementation, the base includes two sets of spaced supports, with the two ends of the outer outer wall of the outer ring rotatably connected to the upper ends of the two sets of supports, and the Y-axis servo motors are two sets, each located on the upper ends of the two sets of supports and adapted to drive the outer ring to rotate.

[0025] In one possible implementation, the inner sidewalls of the two arc-shaped plates are provided with grooves along their arc direction, and the ends of the two sets of suspension components away from the test model are slidably connected to the grooves. The suspension components can slide and be limited within the grooves to adjust the posture of the test model.

[0026] In one possible implementation, the base is equipped with a counterweight whose weight is adjustable.

[0027] The beneficial effects of the slender spatial transformation device for wind tunnel laboratories provided by this invention are as follows: Compared with the prior art, the slender spatial transformation device for wind tunnel laboratories of this invention includes a multi-axis frame, a suspension assembly, a three-axis servo motor, multiple encoders, and a central control system. The multi-axis frame has rotational degrees of freedom around the X-axis, Y-axis, and Z-axis of a three-dimensional coordinate system, respectively. The suspension assembly is connected to the inner wall of the multi-axis frame and is used to suspend and connect the test model to be tested. The 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, Y-axis, and Z-axis, respectively. The system features axial and Z-axis rotation; multiple encoders are electrically connected to the X-axis, Y-axis, and Z-axis servo motors respectively, and each receives rotation angle signals; the central control system is electrically connected to the three-axis servo motors and multiple encoders. The central control system is suitable for controlling the operation of the three-axis servo motors to accurately adjust the spatial attitude of the test model. This solves the technical problems of insufficient accuracy, cumbersome adjustment, and difficulty in repeatable control in the methods of adjusting the attitude of slender structures in wind tunnel experiments. It has the technical effect of high accuracy, simple adjustment, and precise control of the attitude of the test model in wind tunnel experiments. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of a slender spatial transformation device for a wind tunnel laboratory provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of a slender spatial transformation device for a wind tunnel laboratory, provided in another embodiment of the present invention;

[0031] Figure 3 for Figure 2 Enlarged view of the structure at point A in the image;

[0032] Figure 4 This is a schematic diagram of the connection structure between the inner ring and the middle ring of a slender spatial transformation device for a wind tunnel laboratory, provided as an embodiment of the invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Multi-axis frame; 11. Base; 111. Support; 12. Outer ring; 13. Middle ring; 131. Groove; 14. Inner ring; 141. Arc plate; 142. Slide groove; 15. Slide rail; 16. Slider; 17. Rotary disk; 171. Fixed end; 172. Rotating end; 18. Counterweight;

[0035] 2. Suspension assembly; 21. Support frame; 22. Spring hook;

[0036] 3. Three-axis servo motor; 31. X-axis servo motor; 32. Y-axis servo motor; 33. Z-axis servo motor;

[0037] 4. Central control system. Detailed Implementation

[0038] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0039] Please refer to the following: Figures 1 to 4 The present invention will now describe a slender spatial transformation device for a wind tunnel laboratory. This slender spatial transformation device for a wind tunnel laboratory includes a multi-axis frame 1, a suspension assembly 2, a three-axis servo motor 3, multiple encoders, and a central control system 4. The multi-axis frame 1 has rotational degrees of freedom about the X, Y, and Z axes of 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 the test model to be tested (e.g., [model name missing]). Figure 1 The structure located in the middle is indicated by a dashed line); 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 used to drive the multi-axis frame 1 to rotate around the X-axis, Y-axis, and Z-axis, respectively; multiple encoders are electrically connected to the X-axis servo motor 31, Y-axis servo motor 32, and Z-axis servo motor 33, and receive rotation angle signals to ensure high precision of angle adjustment; the central control system 4 is electrically connected to the three-axis servo motor 3 and multiple 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.

[0040] This invention provides a slender spatial transformation device for wind tunnel laboratories. Compared with existing technologies, it achieves rotation along the X, Y, and Z axes through a multi-axis frame 1 to adjust the attitude of the test model. An encoder precisely controls the rotation angle, and a central control system 4 provides electronic control of the three-axis servo motors 3. This solves the technical problems of insufficient precision, cumbersome adjustment, and difficulty in repeatable control in existing methods for adjusting the attitude of slender structures in wind tunnel experiments. It offers high precision, simple adjustment, and precise control of the test model's attitude in wind tunnel experiments. This invention provides precise three-dimensional adjustment suitable for slender structures, applicable to complex experiments in wind tunnels; it reduces experimental complexity and human intervention, improving adjustment precision and experimental efficiency; and it maintains low cost and compact size, adapting to the limited space of wind tunnel laboratories.

[0041] This invention constructs a multi-axis frame 1, similar to a gyroscope, by combining a three-axis servo motor 3 with a high-precision encoder. This ensures that slender structures such as elongated rectangular prisms can rotate and tilt in all directions within a spherical space. This invention can adapt to wind tunnel experiments on test models of different sizes. The central control system 4 precisely controls the operation of the three-dimensional servo motor, automatically sets the attitude, and improves accuracy and experimental efficiency. The coordinate system used in this invention is a Cartesian three-dimensional coordinate system. In this embodiment, both the encoder and the central control system 4 employ existing technology. Their electrical connection enables precise control and adjustment of the test model's attitude, resulting in accurate experimental results. Multiple casters are provided at the bottom of the base 11. These casters support the base 11 and allow it to move to any position. The casters can also be locked to fix the position of the base 11.

[0042] In some embodiments, please refer to Figures 1 to 3The 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 about the Y-axis. The inner wall of the outer ring 12 is provided with a slide rail 15 along its circumference. The middle ring 13 is located inside 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 slide rail 15. The middle ring 13 rotates circumferentially inside the outer ring 12 to form a rotational degree of freedom about the X-axis. The inner ring 14 is located inside 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 about the Z-axis. The suspension assembly 2 is connected to the inner wall of the inner ring 14. The base 11 supports the outer ring 12. Good support stability for the outer ring 12 ensures structural stability during wind tunnel experiments, preventing swaying or tilting and thus maintaining the accuracy of the experiment. Both the outer ring 12 and the middle ring 13 are annular components. Rotating the outer ring 12 on the base 11 allows the test model to rotate around the Y-axis; the rotation angle of the outer ring 12 is adjustable and can be locked. Rotating the middle ring 13 within the outer ring 12 along its circumference allows the test model to rotate around the X-axis; the rotation angle of the middle ring 13 is adjustable and its position or angle can be locked. Rotating the inner ring 14 within the middle ring 13 around the vertical direction (Z-axis) allows the test model to rotate around the Z-axis; the rotation angle is adjustable and its position or angle can be locked. The slide 15 is set on the inner side wall of the outer ring 12. The depth direction of the slide 15 extends radially into the outer ring 12 and does not penetrate the outer side wall of the outer ring 12.

[0043] Specifically, the inner ring 14 structure in this embodiment is different from the outer ring 12 or the middle ring 13 structure.

[0044] To achieve rotation of the middle ring 13 about the X-axis, in some embodiments, please refer to... Figures 1 to 3 Two sets of sliders 16 are evenly distributed on the outer wall of the middle ring 13. These two sets of sliders 16 are located at opposite ends of the middle ring 13 and are slidably connected to a slide rail 15. The position of the sliders 16 after sliding within the slide rail 15 can be locked. As shown in Figure 1, the two sets of sliders 16 are located at the upper and lower ends of the middle ring 13, respectively. When the middle ring 13 rotates, the two sets of sliders 16 simultaneously slide within the slide rail 15, achieving rotation of the middle ring 13 around the X-axis and thus adjusting the attitude of the test model. The two sets of sliders 16 will not naturally slip out of the slide rail 15 and can always maintain their sliding freedom within the slide rail 15. To stop the rotation of the middle ring 13, the sliders 16 can be locked within the slide rail 15.

[0045] To achieve rotation of the inner ring 14 about the Z-axis, in some embodiments, please refer to... Figures 1 to 4Two sets of rotating disks 17 are connected to the outer wall of the inner ring 14. One end of each rotating disk 17 has a degree of freedom to rotate circumferentially relative to its other end. 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. In this embodiment, the rotating disk 17 includes a fixed end 171 and a rotating end 172 that are rotatably connected to each other. 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), while 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 connected to the rotating end 172 and used to drive the rotating end 172 to rotate, thereby driving the inner ring 14 to rotate. Thus, the inner ring 14 can rotate 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 rotary table.

[0046] In some embodiments, please refer to Figures 1 to 3 The inner ring 14 includes two identical arc-shaped plates 141, which can form a ring, with the axis of the ring forming an acute or obtuse angle with the axis of the middle ring 13. Two sets of rotating disks 17 are respectively connected to the ends of the two arc-shaped plates 141 closest to the middle ring 13, and the other ends of the two arc-shaped plates 141 extend toward either the middle ring 13 or the outer ring 12. The two arc-shaped plates 141 are arranged opposite each other and can rotate through their respective connected rotating disks 17. The two sets of suspension assemblies 2 are also arranged opposite each other, capable of clamping and fixing 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 assembly 2. The arc-shaped extension direction of the arc-shaped plate 141 is towards the direction away from the middle ring 13, that is, the angle between the axis of the inner ring 14 and the axis of the middle ring 13 is set at an acute or obtuse angle.

[0047] In some embodiments, please refer to Figures 1 to 3 The suspension assembly 2 includes two sets of support frames 21 and multiple spring hooks 22. The two sets of support frames 21 are respectively connected to the inner side of the end of each of the two arc-shaped plates 141 furthest from the middle ring 13 or the outer ring 12, and are arranged opposite to each other. The multiple spring hooks 22 are respectively connected to the ends of the two sets of support frames 21, and are used to attach the two ends of the test model. The two sets of support frames 21 have identical structures, both arranged in a cross shape. Each support frame 21 is connected to the arc-shaped plate 141, and each set of support frames 21 has four spring hooks 22. One end of each spring hook 22 is connected to the support frame 21, and the other end is used to connect to the test model. The multiple spring hooks 22 enable the fixation of the test model for wind tunnel experiments.

[0048] For smaller or shorter test models, curved plates 141 with different curvatures can be selected to reduce the distance between the two sets of support frames 21, thus allowing for the connection of smaller test models. Alternatively, a vertical rod (not shown in the diagram) can be added between the rotating disk 17 and the curved plate 141, with one end connected to the rotating disk 17 and the other end connected to one end of the curved plate 141. This reduces the distance between the two curved plates 141, enabling the connection and fixation of smaller test models for wind tunnel experiments.

[0049] In some embodiments, please refer to 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. There are two sets of Z-axis servo motors 33, which are respectively connected to the two arc plates 141 near the middle ring 13. Their power output ends are connected to the middle ring 13. The Z-axis servo motors 33 are used to drive the inner ring 14 to rotate around the Z-axis. The X-axis servo motor 31, Y-axis servo motor 32 and Z-axis servo motor 33 are all electrically connected to the central control system 4, and their operation is controlled by the central control system 4. This invention achieves arbitrary angle spatial transformation in wind tunnel experiments by adjusting the arbitrary angle of a slender structure (such as a slender rectangular column) through electric control. It can well simulate the structural stress under various wind field conditions, so as to more comprehensively study and verify the aerodynamic characteristics and stability of the structure. This invention can automatically adjust the angle of a slender structure according to predetermined test angle requirements, thereby enabling real-time observation and recording of the structure's aerodynamic performance under different attitudes. This invention is applicable to wind tunnel experimental research, including the aerodynamic characteristic analysis of bridges, masts, aircraft components, and buildings.

[0050] Preferably, the X-axis servo motor 31, Y-axis servo motor 32, and Z-axis servo motor 33 are all equipped with drivers (which are prior arts and not shown in the figure). The advantage is that it can ensure precise angle control. The driver is connected to the X-axis servo motor 31 or Y-axis servo motor 32 or 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 values of the X-axis servo motor 31, Y-axis servo motor 32, and Z-axis servo motor 33 are set in the driver, which can ensure that the physical limit is not exceeded during operation to avoid damaging the mechanical structure. The central control system 4 in the present invention is provided with control logic programming. By programming the control logic for the X-axis servo motor 31, Y-axis servo motor 32, and Z-axis servo motor 33, each servo motor can act according to the preset sequence and precision. For the requirement of three-dimensional attitude change, a coordinate transformation algorithm for the attitude is programmed on the central control system 4. The advantage is that it can ensure the coordinated action of the three servo motors and achieve the linkage change in a complex space.

[0051] The present invention realizes the three-dimensional angle change of the test model as follows:

[0052] 1) Input of attitude transformation and motion path planning

[0053] Input of target angle: The user inputs the target attitude angle of the test model through the control interface of the central control system 4 to set the rotation angles around the X-axis, Y-axis, and Z-axis.

[0054] Motion path planning: According to the input target angle, the central control system 4 plans a motion path for each servo motor to ensure a smooth and impact-free transformation process of the test model from the current attitude to the target attitude.

[0055] 2) Angle linkage control and implementation

[0056] Gradual angle transformation:

[0057] Around the X-axis: The central control system 4 first activates the X-axis servo motor 31 to drive the middle ring 13 to rotate the slender square column horizontally around the X-axis to reach the set angle.

[0058] Around the Z-axis: The Z-axis servo motor 33 then starts to work to drive the slender square column to rotate around the Z-axis.

[0059] Around the Y-axis: Finally, the Y-axis servo motor 32 starts to work to drive the slender square column to rotate around the Y-axis to complete the final attitude adjustment.

[0060] Three-axis linkage:

[0061] If adjustments to multiple axes need to be made simultaneously, the central control system 4 will synchronously command three servo motors (i.e., X-axis servo motor 31, Y-axis servo motor 32, and Z-axis servo motor 33) to achieve complex attitude changes through joint drive. In this way, the test model can achieve more natural and realistic spatial attitude transformations.

[0062] 3) Real-time feedback and angle correction

[0063] Encoder real-time 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.

[0064] Error correction and precision adjustment: If an error exists, the central control system 4 will adjust the action of the servo motor in a timely manner to correct the angle deviation. This ensures that each attitude adjustment can reach the set target attitude and achieve high-precision attitude change.

[0065] Specifically, the X-axis servo motor 31, Y-axis servo motor 32, and Z-axis servo motor 33 are all equipped 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. This prevents exceeding the preset rotation range during operation, thus avoiding physical collisions and equipment damage.

[0066] In some embodiments, please refer to Figures 1 to 2 The base 11 includes two sets of spaced supports 111. The two ends of the outer wall of the outer ring 12 are rotatably connected to the upper ends of the two sets of supports 111. There are two sets of Y-axis servo motors 32, which are respectively located on the upper ends of the two sets of supports 111 and are suitable for driving the outer ring 12 to rotate. The bottom of both sets of supports 111 is triangular, and the upper end is a straight rod with a bearing at the upper end of the straight rod. The outer wall of the outer ring 12 is rotatably connected to the bearing, that is, the outer ring 12 can rotate relative to the supports 111. The power output end of the Y-axis servo motor 32 can pass through the bearing (because the bearing has a cavity inside, that is, through the cavity) and connect to the outer ring 12, thus driving the outer ring 12 to rotate.

[0067] If the test model can be adjusted in other directions, please refer to some embodiments. Figure 3The inner walls of the two arc-shaped plates 141 are provided with grooves 142 along their arc direction. The ends of the two suspension components 2 away from the test model are slidably connected to the grooves 142. The suspension components 2 can slide and be limited within the grooves 142 to adjust the attitude of the test model. The grooves 142 are located at the bottom end of the arc-shaped plates 141, i.e., on the inner wall, while the outer wall of the support frame 21 is provided with a slider. The slider can slide within the grooves 142, and the sliding position can be adjusted and the position after sliding can be limited within the grooves 142. This allows the attitude of the test model to be adjusted in directions other than the X-axis, Y-axis, and Z-axis, so as to conduct experiments in different attitudes in wind tunnel experiments.

[0068] Specifically, a set screw (which is prior art and not shown in the figure) is provided on the support frame 21 or the slide. By screwing the set screw, the inner end of the set screw can abut against the slide 15 to lock the position of the support frame 21.

[0069] In some embodiments, please refer to Figures 1 to 2 The base 11 is equipped with a counterweight 18, the weight of which is adjustable. The position of the counterweight 18 connected to the base 11 is adjustable because this invention is primarily used in wind tunnel experiments. To achieve the goal of adjusting the center of gravity and ensuring the stability of the multidimensional frame at different angles, the counterweight 18 allows for adjustment of the center of gravity position of the multidimensional frame according to experimental requirements.

[0070] This invention is applicable to the three-dimensional attitude adjustment of slender structures, primarily used in wind tunnel experiments on special structures such as slender structures. Employing a multi-dimensional framework similar to a gyroscope, it achieves precise attitude adjustment in three-dimensional space. This invention can meet the complex attitude adjustment requirements of slender structures in wind tunnel experiments, significantly improving adaptability and flexibility. Compared to the shortcomings of existing rotation systems, this invention uses computer control (i.e., the central control system 4) to operate each servo motor, and provides real-time attitude feedback through a high-precision encoder. This not only enables automated and precise control but also allows for real-time adjustment and recording during the experiment, reducing human error and improving experimental efficiency and repeatability. Figure 3 The dashed square column structure at the bottom represents the test model.

[0071] This invention is more suitable for test models of slender structures. Existing technologies are mainly for symmetrical aerospace models and are not adaptable enough. This invention, through a specially designed multi-axis frame 1, realizes flexible attitude adjustment of slender structures such as slender rectangular columns in three-dimensional space, which can meet the research needs of slender structure.

[0072] This invention features a simple structure, small size, and modular design, making wind tunnel equipment integration more convenient, suitable for limited laboratory spaces, and lower in cost. Combined with computer control, it enables remote automated operation, reducing reliance on human labor during experiments and improving experimental efficiency and data acquisition reliability.

[0073] Compared to the complex mechanical structures of conventional or existing technologies, this invention adopts a compact and streamlined design, which reduces interference with airflow in the wind tunnel, making experimental data more accurate and effective.

[0074] 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 within the protection scope of the present invention.

Claims

1. A slender spatial transformation device for a wind tunnel laboratory, characterized in that, include: The multi-axis frame has rotational degrees of freedom about the X, Y, and Z axes of the three-dimensional coordinate system, respectively. A suspension assembly, connected to the inner wall of the multi-axis frame, is used to suspend and connect the test model to be tested. The 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. Multiple encoders are electrically connected to the X-axis servo motor, the Y-axis servo motor and the Z-axis servo motor respectively, and receive rotation angle signals respectively; A central control system is electrically connected to the three-axis servo motor and multiple encoders. The central control system is adapted to control the operation of the three-axis servo motor to precisely adjust the spatial attitude of the test model. The multi-axis frame includes: Base; The outer ring and its outer sidewall are rotatably connected to the base. The outer ring has a degree of freedom of rotation about the Y-axis. The inner sidewall of the outer ring is provided with a slide along its circumference. A middle ring is located 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 and is slidably connected to the slide rail. The middle ring rotates circumferentially inside the outer ring to form a degree of freedom of rotation about the X-axis. An inner ring is located inside the middle ring and is rotatably connected to the inner wall of the middle ring. The inner ring rotates inside the middle ring to form a degree of freedom of rotation about the Z-axis. The suspension assembly is connected to the inner wall of the inner ring. The outer wall of the inner ring is connected to two sets of rotating disks. One end of each rotating disk has a degree of freedom to rotate circumferentially relative to the other end. One end of each 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. The inner ring includes two arc-shaped plates with the same structure, which can form a circular ring and the axis of the circular ring is set at an acute or obtuse angle with the axis of the middle ring. The two sets of rotating disks are respectively connected to one end of the two arc-shaped plates near the middle ring, and the other end of the two arc-shaped plates extends toward the two ends of the middle ring or the outer ring, respectively. The suspension assembly includes: Two sets of support frames are respectively connected to the inner side of the two arc-shaped plates and away from the middle ring or the outer ring, and the two sets of support frames are arranged opposite to each other; Multiple spring hooks are respectively connected to the ends of the two sets of support frames, and the multiple spring hooks are used to hang the two ends of the test model; A vertical rod is connected between the rotating disk and the arc-shaped plate, and the vertical rod is used to reduce the distance between the two arc-shaped plates; The inner sidewalls of the two arc-shaped plates are provided with grooves along their arc direction. The ends of the two sets of suspension components away from the test model are slidably connected to the grooves. The suspension components can slide and be limited in the grooves to adjust the posture of the test model. The base is equipped with multiple casters at its bottom, which support the base. The base is also equipped with a counterweight, the weight of which is adjustable.

2. The slender spatial transformation device for a wind tunnel laboratory as described in claim 1, characterized in that, Two sets of sliders are evenly distributed on the outer wall of the middle ring. The two sets of sliders are located at both ends of the middle ring, and both sets of sliders are slidably connected to the slide rail. The position of the slider after sliding in the slide rail can be locked.

3. The slender spatial transformation device for a wind tunnel laboratory as described in claim 1, 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 along the X-axis. 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 along the Y-axis. There are two sets of Z-axis servo motors, which are respectively connected to the two arc-shaped plates near one end of the middle ring. Their power output ends are connected to the middle ring. The Z-axis servo motors are used to drive the inner ring to rotate along the Z-axis.

4. The slender spatial transformation device for a wind tunnel laboratory as described in claim 3, characterized in that, The base includes two sets of spaced supports. The two ends of the outer outer wall of the outer ring are rotatably connected to the upper ends of the two sets of supports. The Y-axis servo motor consists of two sets, which are respectively located on the upper ends of the two sets of supports and are suitable for driving the outer ring to rotate.

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