A high-angle-of-attack tail boom system and its implementation in a high-precision multi-directional load test method

Abstract

A high-angle-of-attack tail support system and a high-precision multi-directional load test method implemented therewith. The present invention comprises a high-precision support frame, a primary angle-of-attack mechanism, and a secondary angle-of-attack mechanism. Both the primary angle-of-attack mechanism and the secondary angle-of-attack mechanism are pitch attitude mechanisms. The high-precision support frame is provided with the primary angle-of-attack mechanism. The primary angle-of-attack mechanism comprises an arc-shaped slide rail, a sliding seat, and a scimitar body. The arc-shaped slide rail is fixedly connected to the high-precision support frame. The arc-shaped slide rail performs horizontal rotation and / or vertical lifting movement under the drive of the high-precision support frame. The sliding seat is slidably matched on the arc-shaped slide rail. The lower end of the scimitar body is detachably connected to the sliding seat. The upper end of the scimitar body is provided with a secondary angle-of-attack mechanism. The secondary angle-of-attack mechanism is provided with a test target model. The test target model performs compound multi-angle pitch movement under the drive of the sliding seat and the secondary angle-of-attack mechanism.

Description

Technical Field

[0001] The present invention specifically relates to a high-angle-of-attack tail strut system and a high-precision multi-directional load test method implemented therein. Background Art

[0002] The basic principles of wind tunnel testing are the principles of relativity and similarity. According to the principle of relativity, the aerodynamic forces acting on an aircraft flying in static wind tunnel test air are the same as those acting on a stationary aircraft with air blowing in the opposite direction at the same speed. However, aircraft have a relatively large frontal area, ranging from a few meters or tens of meters for smaller wingspans to tens of meters for larger ones (the Boeing 747 has a 60-meter span). The energy consumption of airflow at flight speeds over such a large frontal area would be staggering. Based on the principle of similarity, small-scale models of aircraft can be constructed with similar geometry, and the airflow speed can be lower than flight speed within a certain range. The test results can be used to infer the actual aerodynamic forces acting on the aircraft during flight. As a complete set of aerodynamic testing equipment, wind tunnels are relatively complex in construction. Based on the airflow speed in the test section, wind tunnels are generally categorized into: low-speed wind tunnels (M ≤ 0.3), high subsonic wind tunnels (0.3 ≤ M ≤ 0.8), transonic wind tunnels (0.8 ≤ M ≤ 1.5), and supersonic wind tunnels (1.5 ≤ M ≤ 4.5). Hypersonic wind tunnels (4.5≤M≤10) and ultra-high-speed wind tunnels (M>10) currently do not have enough range for testing multi-degree-of-freedom postures in wind tunnel tests. Once the angle of the motion posture is expanded, it will lead to more matching components and more connection positions between components, which will lead to a decrease in the overall stiffness and stability of the tail support system, making it difficult to improve the above performance at the same time.

[0003] Furthermore, test data is obtained using a balance. If the angle of attack range meets the test requirements, a single wind tunnel run (i.e., without stopping the wind tunnel motor) can produce the required load curve. For example, a test must complete an angle of attack test from -50° to 50°, with load test data collected every 2°. Because factors such as wind tunnel temperature and humidity, motor speed, and the configuration of the support system can affect the accuracy of load data, data collection is completed in a single pass, resulting in a smooth and continuous data curve. If the angle of attack range is insufficient, achieving the full angle of attack range requires replacing the struts twice or more. Replacing the struts requires stopping the wind, which takes time and changes the state of both the wind tunnel and the support structure. This can cause test data to jump at angle junctions, creating significant challenges for data processing. Summary of the Invention

[0004] In order to overcome the defects of the existing technology, a high-angle-of-attack tail strut system and a high-precision multi-directional load test method for the same are provided to solve the problem that the range of postures tested with multiple degrees of freedom in current wind tunnel tests is not enough. Once the angle of the motion posture is expanded, it will lead to more matching components and more connection positions between components, which will lead to a decrease in the overall stiffness and stability of the tail strut system, making it difficult to improve the above-mentioned performance at the same time.

[0005] A high-angle-of-attack tail support system comprises a high-precision support frame, a primary angle-of-attack mechanism and a secondary angle-of-attack mechanism, wherein the primary angle-of-attack mechanism and the secondary angle-of-attack mechanism are both pitch attitude mechanisms, the high-precision support frame is provided with a primary angle-of-attack mechanism, the primary angle-of-attack mechanism comprises an arc-shaped slide rail, a sliding seat body and a scimitar body, the arc-shaped slide rail is fixedly connected to the high-precision support frame, and the arc-shaped slide rail makes horizontal rotation movement and / or vertical lifting movement under the drive of the high-precision support frame, the arc-shaped slide rail is slidably matched with the sliding seat body, the lower end of the scimitar body is detachably connected to the sliding seat body, the upper end of the scimitar body is provided with a secondary angle-of-attack mechanism, the secondary angle-of-attack mechanism is provided with a test target model, and the test target model makes compound multi-angle pitch movement under the drive of the sliding seat body and the secondary angle-of-attack mechanism.

[0006] As a preferred solution: the high-precision support frame includes a main frame, a large gear turntable, a side drive, a top support seat, four two-way guide assemblies and four air-floating tensioning positioning seats. The main frame includes two mouth-shaped support frames and two cross bars. The two mouth-shaped support frames are arranged vertically in parallel, and the two cross bars are arranged horizontally in parallel between the two mouth-shaped support frames. A horizontal mouth-shaped structure is formed between the two cross bars and the bottom of the two mouth-shaped support frames. A top support seat is arranged between the tops of the two mouth-shaped support frames. The large gear turntable is rotatably connected to the top support seat, the side drive is arranged on the top support seat, and the side drive is engaged with the large gear turntable. An air-floating tensioning positioning seat is provided at the bottom of each end corner of the horizontal mouth-shaped structure, and the four two-way guide assemblies are arranged vertically in parallel on the main frame. The top support seat makes reciprocating lifting and lowering movements along the height direction of the main frame through the four two-way guide assemblies.

[0007] As a preferred solution: Each bidirectional guiding component includes a first linear slide, a second linear slide, a guiding connection seat, a guiding rod, and an L-shaped connection block. The guiding connection seat is arranged on the top of the horizontal mouth-shaped structure body. A connecting plate is vertically arranged on the outer wall of the mouth-shaped support frame body, and the bottom of the connecting plate is fixedly connected to the guiding connection seat. The overhead support seat body is a square seat body. The L-shaped connection block is arranged at the end of the overhead support seat body. The first linear slide is vertically arranged on the outer wall of the connecting plate, and the second linear slide is vertically arranged on the outer wall of the mouth-shaped support frame body. One end outer wall of the L-shaped connection block is fixedly connected to the sliding part of the first linear slide, and the other end outer wall of the L-shaped connection block is fixedly connected to the sliding part of the second linear slide. The guiding rod is vertically arranged on the guiding connection seat, and the top end of the guiding rod is in sliding fit with the outer wall of the L-shaped connection block.

[0008] As a preferred solution: Four air-floating tensioning positioning seat bodies are cooperatively arranged with a bottom frame. The bottom frame is a square frame body. One air-floating tensioning positioning seat body is correspondingly arranged at each end angle of the bottom frame. Each air-floating tensioning positioning seat body includes an upper support plate, a tensioning column body, and an air-floating seat body. The upper support plate is horizontally arranged on the bottom frame, and the end of the main frame body is arranged on the upper support plate. The air-floating seat body is arranged at the bottom of the upper support plate. A plurality of air cushion claws are arranged at the bottom of the air-floating seat body. The tensioning column body vertically penetrates through the upper support plate. The top end of the tensioning column body is the control end, and the bottom end of the tensioning column body is the telescopic end. The control end of the tensioning column body drives the telescopic end to make a downward elongation or upward retraction movement. When the telescopic end of the tensioning column body and the plurality of air cushion claws are on the same horizontal plane, the bottom frame is in a fixed position state.

[0009] As a preferred solution: The arc-shaped slide rail includes a strip-shaped bottom plate, two vertical plates, two arc-shaped racks, and two single-body slide rails. The strip-shaped bottom plate is fixedly connected to the top surface of the large gear turntable along the radial direction of the large gear turntable. The two vertical plates are arranged in parallel on the strip-shaped bottom plate. The length direction of the vertical plates is the same as the length direction of the strip-shaped bottom plate. The top side of each vertical plate is an arc-shaped side. One single-body slide rail is arranged on the outer side of each arc-shaped side. The sliding seat body is a U-shaped seat body. The sliding seat body is buckled between the two vertical plates. The bottom of the sliding seat body has a clearance fit with the arc-shaped sides of the two vertical plates. The two single-body slide rails are in sliding fit with the inner walls of the two sides of the sliding seat body. One arc-shaped rack is arranged on the inner side of each arc-shaped side. A plurality of teeth are evenly distributed at the bottom of each arc-shaped rack.

[0010] As a preferred solution: the secondary angle of attack mechanism includes a conical connecting rod, a three-pronged connecting piece and a telescopic cylinder, the T-shaped connecting rod of the three-pronged connecting piece, the top of the scimitar body is provided with a first hinge seat, the outer side wall of the scimitar body is provided with a second hinge seat, the first hinge seat is hinged to the first end of the three-pronged connecting piece, the second end of the three-pronged connecting piece is connected to one end of the conical connecting rod, the other end of the conical connecting rod is connected to the test target model, the third end of the three-pronged connecting piece is hinged to the telescopic end of the telescopic cylinder, and the bottom of the telescopic cylinder is hinged to the second hinge seat.

[0011] The high-precision multi-directional load test method implemented using a high-angle-of-attack tail boom system described in Specific Embodiments 1, 2, 3, 4, 5, 6, or 7 is as follows:

[0012] Run the test target model to the extreme angle of the first-stage angle of attack mechanism and / or the second-stage angle of attack mechanism;

[0013] Drive the wind tunnel to start blowing wind and make the wind speed reach the predetermined wind speed required by the test;

[0014] The computer collects load data when the test target model is at the extreme angles of the first-stage angle of attack mechanism and / or the second-stage angle of attack mechanism;

[0015] The telescopic rod extension and retraction of the telescopic cylinder of the secondary angle of attack mechanism and the up and down movement of the bidirectional guide assembly are obtained from the standard table. The test target model is made to reach -40°, -30°, and -25° respectively, and the corresponding load data is collected.

[0016] Run the first-stage angle of attack mechanism to make the test target model reach -20°, -10°, 0°, 10°, 20°, and 25° respectively, and collect the corresponding load data;

[0017] The telescopic rod extension and retraction amount of the telescopic cylinder of the secondary angle of attack mechanism and the up and down movement amount of the bidirectional guide assembly are obtained through the standard table, so that the test target model reaches 30°, 40°, and 50° respectively, and the corresponding load data is collected to complete a continuous and coherent test process.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention realizes a multi-degree-of-freedom motion posture of a test target model that is a combination of horizontal swing and lifting motion through the mutual cooperation between the high-precision support frame, the first-level angle of attack mechanism, and the second-level angle of attack mechanism. When the test target model is a small aircraft, the mutual cooperation between the high-precision support frame, the first-level angle of attack mechanism, and the second-level angle of attack mechanism can realize an angle of attack range of -50° to 50°, which is consistent with the actual flight angle of attack requirements of the small aircraft, so that the test results can be better used to guide actual flight conditions. The mutual cooperation between the high-precision support frame, the first-level angle of attack mechanism, and the second-level angle of attack mechanism can also ensure that the test data can be continuously and coherently acquired in an uninterrupted wind state, avoiding the occurrence of test breakpoints, while ensuring the efficiency of continuous testing.

[0020] 2. The present invention is used to support the test model and can realize the attack angle, side sliding and lifting movement of the test model. The present invention has the advantages of a large test attack angle range, uniform and stable overall system stiffness, large load-bearing capacity and high positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a first three-dimensional structure with a wind shield according to the present invention;

[0022] Figure 2 This is a schematic diagram of a second three-dimensional structure with a wind shield according to the present invention;

[0023] Figure 3 It is a schematic diagram of the first three-dimensional structure of the present invention;

[0024] Figure 4 is a schematic diagram of a second three-dimensional structure of the present invention;

[0025] Figure 5 It is a first three-dimensional structural diagram of the connection relationship between the scimitar body in the first-stage angle of attack mechanism, the second-stage angle of attack mechanism and the test target model;

[0026] Figure 6 A second three-dimensional structural diagram of the connection relationship between the scimitar body in the first-stage angle of attack mechanism, the second-stage angle of attack mechanism, and the test target model;

[0027] Figure 7 A schematic diagram of the three-dimensional structure of the connection between the arc-shaped slide rail and the sliding seat body;

[0028] Figure 8 A schematic diagram of the three-dimensional structure of the connection relationship between the two vertical plates and the inner driver;

[0029] Figure 9 This is a schematic diagram of the three-dimensional structure of the air-floating tensioning and positioning seat;

[0030] Figure 10 Schematic diagram of the three-dimensional structure of the bidirectional guide component;

[0031] Figure 11 Schematic diagram of the arrangement of the first linear slide and the second linear slide on the die support frame;

[0032] Figure 12 This is a schematic diagram of the first extreme position of the present invention, in which the high angle of attack tail boom system is in a wind tunnel cooperation state;

[0033] Figure 13 This is a schematic diagram of the second extreme position of the present invention;

[0034] Figure 14 This is a schematic diagram of the third extreme position of the present invention;

[0035] Figure 15 This is a schematic diagram of the fourth extreme position of the present invention.

[0036] In the figure: 1-high-precision support frame; 2-first-stage angle-of-attack mechanism; 21-arc-shaped slide rail; 21-1-strip bottom plate; 21-2-vertical plate; 21-3-arc-shaped rack; 21-4-single slide rail; 21-5-arc-shaped side; 21-6-teeth; 22-sliding seat body; 22-1 component frame; 23-scimitar body; 3-second-stage angle-of-attack mechanism; 3-1-conical connecting rod; 3-2-three-pronged connecting piece; 3-3-telescopic cylinder; 3-3-1-telescopic end; 4-bottom frame; 5-inner drive; 5-1-dual-axis drive motor; 5-2-pinion; 6-first articulated seat; 7-second articulated seat; 10-test target model; 11-main frame; 11-1- Mouth-shaped support frame; 11-2-cross bar; 11-3-horizontal mouth-shaped structure; 12-large gear turntable; 13-side drive; 14-top support seat; 15-bidirectional guide assembly; 15-1-first linear slide; 15-2-second linear slide; 15-3-guide connecting seat; 15-4-guide rod; 15-5-L-shaped connecting block; 15-6-connecting plate; 16-air-floating tensioning and positioning seat; 16-1-upper support plate; 16-2-tensioning column; 16-3-air-floating seat; 16-4-air cushion support claw; 16-6-telescopic end; 17-wind hood; 18-connecting bolt group; 30-first reinforcing rib; 31-second reinforcing rib. Implementation Method

[0037] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0038] Specific implementation method 1: Combination Figures 1 to 15To describe this embodiment, the high-angle-of-attack tail boom system in this embodiment includes a high-precision support frame 1, a first-level angle-of-attack mechanism 2 and a second-level angle-of-attack mechanism 3. The first-level angle-of-attack mechanism 2 and the second-level angle-of-attack mechanism 3 are both pitch attitude mechanisms. The high-precision support frame 1 is provided with a first-level angle-of-attack mechanism 2, the first-level angle-of-attack mechanism 2 is provided with a second-level angle-of-attack mechanism 3, and the second-level angle-of-attack mechanism 3 is provided with a test target model 10. When the attitudes of the first-level angle-of-attack mechanism 2 and the second-level angle-of-attack mechanism 3 change and compound, the test target model 10 is driven to perform a large-angle pitch motion and / or a second large-angle pitch motion along with the first-level angle-of-attack mechanism 2 and the second-level angle-of-attack mechanism 3.

[0039] Among them, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 are both curved structures. The first-level angle of attack mechanism 2 includes an arc-shaped slide rail 21, a sliding seat body 22 and a scimitar body 23. The arc-shaped slide rail 21 is a self-stabilizing and self-supporting double-track body, specifically including a strip bottom plate 21-1, two vertical plates 21-2, two arc-shaped racks 21-3 and two single slide rails 21-4. The strip bottom plate 21-1 is a bottom supporting structure. The strip bottom plate 21-1 is fixedly connected to the top surface of the large gear turntable 12 along the radial direction of the large gear turntable 12. The strip bottom plate 21-1 rotates synchronously with the rotation of the large gear turntable 12. The two vertical plates 21-2 are arranged side by side on the strip bottom plate 21-1. On the top, the length direction of the vertical plate 21-2 is in the same direction as the length direction of the strip bottom plate 21-1, the top side of each vertical plate 21-2 is an arc-shaped side 21-5, and the outer side of each arc-shaped side 21-5 is processed with an arc-shaped groove, and a single slide rail 21-4 is buckled, inlaid or welded in the arc-shaped groove. The single slide rail 21-4 is an arc-shaped slide rail, and the curvature of the single slide rail 21-4 is the same as the curvature of the arc-shaped side 21-5. An arc-shaped rack 21-3 is arranged on the inner side of each arc-shaped side 21-5, and a plurality of teeth 21-6 are evenly distributed on the bottom of each arc-shaped rack 21-3. The plurality of teeth 21-6 arranged downward facilitate the formation of a space-saving meshing structure.

[0040] The sliding seat body 22 matched with the arc-shaped slide rail 21 has a compact structure and stable movement. The best structural form is a U-shaped seat body. The sliding seat body 22 is buckled between the two vertical plates 21-2. The bottom of the sliding seat body 22 is gap-fitted with the arc-shaped sides 21-5 of the two vertical plates 21-2, thereby reducing the friction between the sliding seat body 22 and the arc-shaped sides 21-5 when the sliding seat body 22 moves, reducing interference, and ensuring that the sliding seat body 22 slides smoothly. The two single slide rails 21-4 slide in cooperation with the inner walls on both sides of the sliding seat body 22.

[0041] The scimitar body 23 is an arc-shaped rod body, and the lower end of the scimitar body 23 is a tapered blade end. The bottom of the tapered blade end is processed with a cavity, and the top of the sliding seat body 22 is processed with a protrusion, which is arranged in the cavity. The lower end of the scimitar body 23 is connected to the protrusion of the sliding seat body 22 through a multi-point penetration of a connecting bolt group 18, wherein the connecting bolt group 18 is a seven-point connection group, specifically including seven large connecting bolts and two small connecting bolts. Three of the seven large connecting bolts are evenly distributed in sequence along the inclined direction of the tapered blade end, and another large connecting bolt among the seven large connecting bolts is a single connecting bolt, which is arranged below the three large connecting bolts and is connected to one of the three inclined large connecting bolts. The highest large connecting bolt rod is the central large connecting bolt rod, and the central large connecting bolt rod and the single connecting bolt rod are on the same vertical line. The remaining three large connecting bolt rods of the seven large connecting bolt rods are arranged on one side of the central large connecting bolt rod from top to bottom. The highest large connecting bolt rod among the remaining three large connecting bolt rods and the central large connecting bolt rod are on the same horizontal line. One of the two small connecting bolt rods is arranged at the center position between the central large connecting bolt rod and the highest large connecting bolt rod among the remaining three large connecting bolt rods. The other small connecting bolt rod of the two small connecting bolt rods is arranged at the center position between the lowest large connecting bolt rod among the three inclined large connecting bolt rods and the single connecting bolt rod.

[0042] Specific implementation method 2: Combination Figure 7 and Figure 8 As shown, in this embodiment, an inner driver 5 is provided between the two vertical plates 21-2. The inner driver 5 includes a dual-axis drive motor 5-1 and two pinions 5-2. The dual-axis drive motor 5-1 is provided at the bottom of the sliding seat body 22. A pinion 5-2 is respectively mounted on the two power output shafts of the dual-axis drive motor 5-1. The pinion 5-2 is engaged with the arc-shaped rack 21-3.

[0043] In this embodiment, the sliding seat body 22 also has another structural form, that is, the sliding seat body 22 includes two component frames 22-1. The two component frames 22-1 are respectively L-shaped frames. The two component frames 22-1 are arranged in parallel. The horizontal ends of the two component frames 22-1 are arranged opposite to each other. A U-shaped notch is machined at the horizontal end of each component frame 22-1. When the two component frames 22-1 are abutted against each other, the two U-shaped notches are connected to form a square hole for passing through the double-shaft drive motor 5-1, so as to provide sufficient installation space position for the double-shaft drive motor 5-1, making the structural form between the sliding seat body 22, the inner driver 5 and the cutter body 23 more compact, and the driving and cooperating moving stroke effectively stable. The top of the double-shaft drive motor 5-1 is passed through at the square hole and is fixedly connected to the inner wall of the square hole of the sliding seat body 22. The protruding part of the double-shaft drive motor 5-1 can also be used for the passing through of the connecting bolt group 18, making the connection relationship between the sliding seat body 22, the inner driver 5 and the cutter body 23 firm and stable, suitable for various external conditions of wind tunnel tests, and avoiding the occurrence of offset at the self-axial and radial assembly positions of the self-driving support structure formed by the sliding seat body 22, the inner driver 5 and the cutter body 23.

[0044] In this embodiment, the cutter body 23 adopts a smooth streamline external shape; the internal structure is optimized to reduce the mass of the cutter while ensuring its rigidity and strength.

[0045] An optimized structural form of the cutter body 23 in this embodiment is that the cutter body 23 is a hollow structure body. A plurality of transverse ribs are arranged along its length direction inside it. A hollow cavity is formed between two adjacent transverse ribs and the inner wall of the cutter body 23. Thus, while reducing the weight of the cutter body 23, the bending strength of the cutter body 23 itself can also be enhanced. A wire passing hole is left at the rear side of the cutter body 23. The wire groove and a cover plate cooperate to shape the bottom of the cutter body 23. The connection relationship between the hollow-structured cutter body 23 and the top surface of the sliding seat body 22 not only increases the connection strength and connection stability through the setting of the connecting bolt group 18, but also can reduce the processing difficulty of the cutter body 23, save processing costs, and at the same time, the weight reduction structure of the cutter body 23 is carried out inside the cutter, without affecting the external shape of the cutter body 23, ensuring the integrity of the outer surface of the cutter 23, thereby avoiding the generation of other unnecessary interference factors for the test target model 10. The structures and connection relationships not mentioned in this embodiment are the same as those in the first specific embodiment.

[0046] Specific embodiment three: This embodiment is a further limitation of specific embodiment one or two. In this embodiment, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 are both arranged on the high-precision support frame 1. The arc slide rail 21 in the first-level angle of attack mechanism 2 is a component directly connected to the high-precision support frame 1. The movement trend of the arc slide rail 21 is the same as the movement trend of the top of the high-precision support frame 1. The arc slide rail 21 can make horizontal rotation movement and / or vertical lifting movement. The arc slide rail 21 is slidably matched with a sliding seat body 22. The lower end of the scimitar body 23 is detachably connected or bolted to the sliding seat body 22. The upper end of the scimitar body 23 is provided with a second-level angle of attack mechanism 3. The second-level angle of attack mechanism 3 is provided with a test target model 10. The test target model 10 makes a compound multi-angle pitching movement driven by the sliding seat body 22 of the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3.

[0047] Specific implementation method 4: This implementation method is a further limitation of specific implementation methods 1, 2 or 3. Figure 5 and Figure 6 As shown, in this embodiment, the secondary angle of attack mechanism 3 is a multi-hinge point pitch mechanism, specifically including a conical connecting rod 3-1, a three-pronged connecting member 3-2 and a telescopic cylinder 3-3, the T-shaped connecting rod of the three-pronged connecting member 3-2, the top of the scimitar body 23 is provided with a first articulated seat 6, the outer side wall of the scimitar body 23 is provided with a second articulated seat 7, the first articulated seat 6 is hinged to the first end of the three-pronged connecting member 3-2, the second end of the three-pronged connecting member 3-2 is connected to the large end end of the conical connecting rod 3-1, the small end of the conical connecting rod 3-1 is detachably connected to the test target model 10, the third end of the three-pronged connecting member 3-2 is hinged to the telescopic rod 3-3-1 of the telescopic cylinder 3-3, and the bottom of the telescopic cylinder 3-3 is hinged to the second articulated seat 7.

[0048] In this embodiment, telescopic cylinder 3-3 is a conventional electric or hydraulic cylinder, and its telescopic principle is the same as that of conventional electric or hydraulic cylinders. Preferably, it is a small electric or hydraulic cylinder, and achieves the purpose of pulling the test target model 10 via the three-pronged connector 3-2. The upper end structure of the scimitar body 23, combined with the secondary angle of attack mechanism 3, can achieve a large angle of deflection of the test target model 10.

[0049] In this embodiment, the length of the cylinder body of the telescopic cylinder 3-3 is 230.82 mm. When the telescopic rod 3-3-1 of the telescopic cylinder 3-3 is in the extension limit state, its maximum extension length is 257.14 mm.

[0050] Specific embodiment 5: This embodiment further limits specific embodiments 1, 2, 3, or 4. In this embodiment, the central angle corresponding to the curved slide rail 21 is angle A, and the central angle corresponding to the scimitar body 23 is angle B. Angle B is less than or equal to angle A. The central angle A corresponding to the curved slide rail 21 is in the range of 70-91°, and the central angle B corresponding to the scimitar body 23 is in the range of 69-90°.

[0051] Specific embodiment 6: This embodiment is a further limitation of specific embodiments 1, 2, 3 or 4. In this embodiment, the optimal size relationship between the arc-shaped slide rail 21 and the curved blade body 23 is:

[0052] The arc length of the curved rail 21 is greater than or equal to the arc length of the scimitar body 23. The ratio of the arc length of the bottom of the curved rail 21 to the arc length of the bottom of the scimitar body 23 is 12:11, and the ratio of the arc length of the top of the curved rail 21 to the arc length of the top of the scimitar body 23 is 21:20. This length relationship between the curved rail 21 and the scimitar body 23 enables a high angle of attack motion process formed between the primary angle of attack mechanism 2 and the secondary angle of attack mechanism 3.

[0053] Among them, the first-level angle of attack mechanism 2 realizes the angle of attack range of the test target model 10 to be -25°~18° through the mutual cooperation between the arc-shaped slide rail 21, the sliding seat body 22 and the scimitar body 23.

[0054] The secondary angle of attack mechanism 3 achieves an angle of attack range of the test target model 10 of -50° to 50° through the cooperation between the tapered connecting rod 3-1, the three-pronged connecting piece 3-2 and the telescopic cylinder 3-3.

[0055] Specific implementation method 7: This implementation method is a further limitation of specific implementation methods 1, 2, 3, 4, 5 or 6.

[0056] In this embodiment, the process of stable cooperation and non-deflection of the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 also needs to rely on the stable basic structure support cooperation, that is, the stable cooperation of the high-precision support frame 1. The high-precision support frame 1 can not only play a stable support effect, but also realize the dynamic support process of the multi-degree-of-freedom motion posture of the test target model 10. The high-precision support frame 1 includes a main frame 11, a large gear turntable 12, a side drive 13, a top support seat 14, four two-way guide components 15 and four air-floating tensioning and positioning seats 16. The main frame 11 includes two mouth-shaped support frames 11-1 and two cross bars 11-2. The two mouth-shaped support frames 11-1 are vertically arranged in parallel, and the two cross bars 11-2 are horizontally arranged in parallel between the two mouth-shaped support frames 11-1. A horizontal mouth-shaped structure 11-3 is formed between the two cross bars 11-2 and the bottom of the two mouth-shaped support frames 11-1. A top support seat 14 is arranged between the tops of the two mouth-shaped support frames 11-1. The large gear turntable 12 is rotatably connected to the top support seat 14. The side drive 13 is arranged on the top support seat 14, and the side drive 13 is engaged with the large gear turntable 12. The side drive 13 includes a gear, a motor and a support frame. The motor output shaft is equipped with a gear. The motor is connected to the top support base 14 through the support frame. The gear meshes with the large gear turntable 12. The outer edge of the large gear turntable 12 is processed with a circle of teeth for meshing with the gear.

[0057] In this embodiment, an air-floating tensioning positioning seat 16 is provided at the bottom of each end corner of the horizontal mouth-shaped structure 11-3, and four two-way guide components 15 are vertically arranged in parallel on the main frame 11. The top support seat 14 makes reciprocating lifting and lowering motion along the height direction of the main frame 11 through the four two-way guide components 15.

[0058] Specific embodiment eight: This embodiment is a further limitation of specific embodiment seven. Each bidirectional guide assembly 15 includes a first linear slide 15-1, a second linear slide 15-2, a guide connecting seat 15-3, a guide rod 15-4 and an L-shaped connecting block 15-5. The guide connecting seat 15-3 is arranged on the top of the horizontal mouth-shaped structure 11-3. A connecting plate 15-6 is vertically arranged on the outer wall of the mouth-shaped support frame 11-1. The bottom of the connecting plate 15-6 is fixedly connected to the guide connecting seat 15-3. The top support seat 14 is a square seat. The L-shaped connecting block 15- 5 is arranged at the end of the overhead support seat 14, the first linear slide 15-1 is vertically arranged on the outer wall of the connecting plate 15-6, the second linear slide 15-2 is vertically arranged on the outer wall of the mouth-shaped support frame 11-1, one end outer wall of the L-shaped connecting block 15-5 is fixedly connected to the sliding portion of the first linear slide 15-1, and the other end outer wall of the L-shaped connecting block 15-5 is fixedly connected to the sliding portion of the second linear slide 15-2, and the guide rod 15-4 is vertically arranged on the guide connecting seat 15-3, and the top end of the guide rod 15-4 is slidably engaged with the outer wall of the L-shaped connecting block 15-5.

[0059] In this embodiment, a first reinforcing rib 30 is provided on the mouth-shaped support frame 11-1, and the first reinforcing rib 30 is provided close to the first linear slide 15-1. The first reinforcing rib 30 is used to enhance the stability of the first linear slide 15-1. A second reinforcing rib 31 is provided on the mouth-shaped support frame 11-1, and the second reinforcing rib 31 is provided close to the second linear slide 15-2. The second reinforcing rib 31 is used to enhance the stability of the second linear slide 15-2.

[0060] The high-precision support frame 1 of the present invention includes four bidirectional guide assemblies 15. Each bidirectional guide assembly 15 includes a first linear slide 15-1, a second linear slide 15-2, a guide connector 15-3, a guide rod 15-4, and an L-shaped connector 15-5. The four bidirectional guide assemblies 15 not only have the functions of existing screw elevators, but also have a larger driving force and travel range. Furthermore, the positioning and working principles of the four first linear slides 15-1 and the four second linear slides 15-2 can compensate for the defect of existing screw elevators in testing that can only withstand axial forces but not torque. Therefore, the four bidirectional guide assemblies 15 are used to withstand the three torques transmitted by the test target model 10, namely, the rolling moment Mx, the yaw moment My, and the pitch moment Mz. The first linear slide 15-1 and the second linear slide 15-2 play the role of guiding and bearing torque.

[0061] In the present invention, the first linear slide 15-1, the second linear slide 15-2, the guide connecting seat 15-3, the guide rod 15-4 and the L-shaped connecting block 15-5, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 cooperate with each other to enable the test target model 10 to withstand loads such as lift Fy, drag Fx, sideslip force Fz, rolling moment Mx, yaw moment My and pitching moment.

[0062] Specific embodiment nine: This embodiment is a further limitation of specific embodiment seven or eight, four air-floating tensioning positioning seats 16 are provided with a bottom frame 4, the bottom frame 4 is a square frame, and each end corner of the bottom frame 4 is provided with an air-floating tensioning positioning seat 16, each air-floating tensioning positioning seat 16 includes an upper support plate 16-1, a tensioning column 16-2 and an air-floating seat 16-3, the upper support plate 16-1 is horizontally arranged on the bottom frame 4, the end of the main frame 11 is arranged on the upper support plate 16-1, and the air-floating seat 16-3 The bottom of the air-floating seat 16-3 is provided with a plurality of air-cushion claws 16-4 at the bottom of the upper support plate 16-1. The tensioning column 16-2 is vertically inserted through the upper support plate 16-1. The top end of the tensioning column 16-2 is the control end, and the bottom end of the tensioning column 16-2 is the telescopic end 16-6. The control end of the tensioning column 16-2 drives the telescopic end 16-6 to extend downward or retract upward. When the telescopic end of the tensioning column 16-2 and the plurality of air-cushion claws 16-4 are on the same horizontal plane, the bottom frame 4 is in a fixed position. The tensioning column 16-2 provides both support and fixation.

[0063] In this embodiment, the high-precision support frame 1 has the functions of lifting and lowering and horizontal rotation, so as to compensate for the model eccentricity generated by the secondary angle of attack mechanism.

[0064] The main functions of the high-precision support frame 1 in this embodiment are:

[0065] Supporting the first-stage angle of attack mechanism 2 and the second-stage angle of attack mechanism 3;

[0066] Transport function: Use air cushion to transport the angle of attack mechanism to the designated location;

[0067] The offset of the secondary angle of attack mechanism 3 from the wind tunnel axis is compensated. All loads borne by the test target model 10 are transferred to the high-precision support frame 1. The loads borne by the test target model 10 are: lift Fy = 3900 N, drag Fx = 600 N, sideslip force Fz = 550 N, rolling moment Mx = 250 N·m, yaw moment My = 100 N·m, and pitching moment Mz = 400 N·m.

[0068] The high-angle-of-attack tail boom system of the present invention can complete all tests without interrupting the wind. The first-stage angle-of-attack mechanism 2 completes the angle of attack position from -25° to 25°. Once the first-stage angle-of-attack mechanism 2 is in place, the second-stage angle-of-attack mechanism 3 begins to operate, bringing the model to an angle of attack position from -50° to 50°. Data collection for all required angles is completed in a single blow.

[0069] The motion principle of the present invention for conventional small angle tests and high angle of attack tests is as follows:

[0070] When the test target model 10 is undergoing conventional small-angle testing, only the primary angle-of-attack mechanism 2 can be moved. The primary angle-of-attack mechanism 2 is driven by the internal driver 5, which rotates the two pinions 5-2. The two pinions 5-2, through the meshing engagement of the teeth 21-6 on the single slide rail 21-4, drive the sliding seat 22 to move. The movement of the sliding seat 22 drives the scimitar body 23 to move, causing the scimitar body 23 to move on the curved slide rail 21, thereby completing the movement of the primary angle-of-attack mechanism 2.

[0071] When the test target model 10 needs to move at a larger angle of attack, the secondary angle of attack mechanism 3 is used to move it. The movement of the secondary angle of attack mechanism 3 requires the cooperation of the high-precision support frame 1 to meet the requirement that the center of the test target model 10 moves on the axis of the wind tunnel. The telescopic cylinder 3-3 drives the scimitar body 23 to move, wherein the telescopic cylinder 3-3 and the scimitar body 23 both need to rotate around the three ends of the three-pronged connector 3-2, that is, around the first articulated seat 6, the second articulated seat 7 and the third end of the three-pronged connector 3-2 and the telescopic end hinge of the telescopic cylinder 3-3. The secondary angle of attack mechanism 3 will cause the center of the test target model 10 to deviate from the axis of the wind tunnel. The deviation is compensated in real time by the high-precision support frame 1.

[0072] Combine Figures 1-15 The formation process of various motion postures of the present invention at different angles of attack is described as follows:

[0073] The first-level angle of attack mechanism 2 realizes the angle of attack range of the test target model 10 to be -25°~18° through the cooperation between the arc-shaped slide rail 21, the sliding seat body 22 and the scimitar body 23.

[0074] The secondary angle of attack mechanism 3 achieves an angle of attack range of the test target model 10 of -50° to 50° through the cooperation between the tapered connecting rod 3-1, the three-pronged connecting piece 3-2 and the telescopic cylinder 3-3.

[0075] Specific embodiment ten: This embodiment is a further limitation of specific embodiments one, two, three, four, five, six, seven, eight or nine. The test target model 10 and the secondary angle of attack mechanism 3 are equipped with a wind hood 17. The wind hood 17 is a cylindrical hood body. The upper end of the scimitar body 23 is in the wind hood 17, and the lower end of the scimitar body 23 passes through the wind hood 17 and is connected to the sliding seat body 22.

[0076] The present invention comprises a high-precision support frame 1, a primary angle-of-attack mechanism 2, and a secondary angle-of-attack mechanism 3. The movement of the primary angle-of-attack mechanism 2 does not cause the center of the test target model 10 to deviate from the center of the test section, ensuring that the center of the test target model 10 remains stable at the center of the test section.

[0077] The function of the secondary angle of attack mechanism 3 is to increase the angle of attack motion range of the test target model 10 . The secondary angle of attack mechanism 3 causes the center of the test target model 10 to deviate from the center of the test section.

[0078] The functions of the high-precision support frame 1 are mainly:

[0079] First: the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 provide the support foundation for the entire system;

[0080] Second: the deviation of the center of the test target model 10 from the center of the wind tunnel caused by the movement of the secondary angle of attack mechanism 3 is compensated by its own lifting and horizontal swinging movements.

[0081] The positioning accuracy of the present invention is high and can reach ±3'. The dual-axis drive motor 5-1 in the first-level angle of attack mechanism 2 of the present invention is an existing motor reducer product with an accuracy of less than 1'. The dual-axis drive motor 5-1 drives two pinions 5-2 to rotate the pinion 5-2, and the pinion 5-2 engages with the arc-shaped rack 21-3 to complete the movement process of the sliding seat 22. The sliding seat 22 drives the test target model 10 to move through the scimitar body 23, thereby completing the angle of attack change of the test target model 10. The gear processing accuracy between the pinion 5-2 and the arc-shaped rack 21-3 adopts 7GM GB / T10095-1988, and its transmission accuracy is less than 1'; the telescopic cylinder 3-3 in the second-level angle of attack mechanism 3 is an existing electric cylinder product. The telescopic cylinder 3-3 adopts an international first-line brand ball screw electric cylinder, and its telescopic accuracy is less than 0.007mm. The angle conversion angle accuracy is less than 1 minute.

[0082] In the present invention, when a protrusion is provided at the tail of the test target model 10, a corresponding blind hole is processed at one end of the conical connecting rod 3-1 close to the test target model 10 to fit in with the test target model 10, and the test target model 10 and the conical connecting rod 3-1 are plugged in and fit together.

[0083] When a blind hole is provided at the tail of the test target model 10, correspondingly, a protrusion for mating with the test target model 10 is processed at one end of the tapered connecting rod 3-1 close to the test target model 10, and the test target model 10 and the tapered connecting rod 3-1 are plugged in and matched.

[0084] The present invention has multiple limit states, combined with Figures 1 to 15 Several typical limit states of the present invention are described:

[0085] The first limit state of the present invention is:

[0086] like Figure 12 As shown, when the lower end of the scimitar body 23 is set at the left end of the arc-shaped slide rail 21 through the sliding seat body 22, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 are in the first extreme position state, and when the telescopic cylinder 3-3 is in the extended state, the telescopic rod 3-3-1 of the telescopic cylinder 3-3 drives the test target model 10 on the conical connecting rod 3-1 to make an upward-looking action through the three-pronged connecting member 3-2. The angle between the plane where the top surface of the large gear turntable 12 is located and the axis of the length direction of the test target model 10 is C. The limit state of the test target model 10 making an upward-looking action is that the angle C is 18°. At this time, the length of the telescopic rod 3-3-1 is 257.14 mm.

[0087] At the same time, the rotation of the large gear turntable 12 on the top support seat 14 drives the first-level angle of attack mechanism 2 to make a horizontal swing movement. At the same time, the swing of the first-level angle of attack mechanism 2 drives the horizontal swing movement of the test target model 10 on the second-level angle of attack mechanism 3 in the upward-looking state, and cooperates with the two-way guide component 15 to drive the lifting movement of the top support seat 14, so that the test target model 10 can achieve a multi-degree-of-freedom composite posture of horizontal swing and lifting movement in the upward-looking state.

[0088] The second limit state of the present invention is:

[0089] like Figure 13 As shown, when the lower end of the scimitar body 23 is set at the right end of the arc-shaped slide rail 21 through the sliding seat body 22, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 are in the second extreme position state. When the telescopic cylinder 3-3 is in the extended state, the telescopic rod 3-3-1 of the telescopic cylinder 3-3 drives the test target model 10 on the conical connecting rod 3-1 to make a downward movement through the three-pronged connecting member 3-2, and cooperates with the rotation of the large gear turntable 12 on the top support seat body 14 to drive the first-level angle of attack mechanism 2 to make a horizontal swing movement. At the same time, the swing of the first-level angle of attack mechanism 2 drives the test target model 10 on the second-level angle of attack mechanism 3 to make a horizontal swing movement in the upward state, and cooperates with the two-way guide component 15 to drive the lifting movement of the top support seat body 14, so that the test target model 10 can achieve a multi-degree-of-freedom composite posture of horizontal swing and lifting movement in the downward state. The angle between the plane where the top surface of the large gear turntable 12 is located and the axis of the length direction of the test target model 10 is C. The limit state of the test target model 10 making an upward movement is that the angle C is 25°.

[0090] The third limit state of the present invention is:

[0091] like Figure 14As shown, when the lower end of the scimitar body 23 is set at the left end of the arc-shaped slide rail 21 through the sliding seat body 22, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 are in the third extreme position state, and when the telescopic cylinder 3-3 is in the extended state, the telescopic rod 3-3-1 of the telescopic cylinder 3-3 drives the test target model 10 on the conical connecting rod 3-1 to make an upward-looking action through the three-pronged connecting member 3-2. At this time, the first articulated seat 6 is in the extreme state of clockwise rotation, and the angle between the plane where the top surface of the large gear turntable 12 is located and the axis of the length direction of the test target model 10 is C. The extreme state of the test target model 10 making an upward-looking action is that the angle C is 50°, and the length of the telescopic rod 3-3-1 is 123.48 mm.

[0092] At the same time, the rotation of the large gear turntable 12 on the top support seat 14 drives the first-level angle of attack mechanism 2 to make a horizontal swing movement. At the same time, the swing of the first-level angle of attack mechanism 2 drives the test target model 10 on the second-level angle of attack mechanism 3 to make a horizontal swing movement in the upward-looking state, and cooperates with the two-way guide component 15 to drive the lifting movement of the top support seat 14, so that the test target model 10 can achieve a multi-degree-of-freedom composite posture of horizontal swing and lifting movement in the downward-looking state.

[0093] The fourth limit state of the present invention is:

[0094] like Figure 15 As shown, when the lower end of the scimitar body 23 is set at the left end of the arc-shaped slide rail 21 through the sliding seat body 22, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 are in the fourth extreme position state, and when the telescopic cylinder 3-3 is in the extended state, the telescopic rod 3-3-1 of the telescopic cylinder 3-3 drives the test target model 10 on the conical connecting rod 3-1 to make a downward movement through the three-pronged connecting member 3-2. At this time, the first articulated seat 6 is in the extreme state of counterclockwise rotation, and the angle between the plane where the top surface of the large gear turntable 12 is located and the axis of the length direction of the test target model 10 is C. The extreme state of the test target model 10 making a downward movement is that the angle C is 50°, and the length of the telescopic rod 3-3-1 is 280.18 mm.

[0095] At the same time, the rotation of the large gear turntable 12 on the top support seat 14 drives the first-level angle of attack mechanism 2 to make a horizontal swing movement. At the same time, the swing of the first-level angle of attack mechanism 2 drives the test target model 10 on the second-level angle of attack mechanism 3 to make a horizontal swing movement in the upward-looking state, and cooperates with the two-way guide component 15 to drive the lifting movement of the top support seat 14, so that the test target model 10 can achieve a multi-degree-of-freedom composite posture of horizontal swing and lifting movement in the downward-looking state.

[0096] In the present invention, an angle of attack sensor is installed on the test target model 10. The angle of attack sensor is an existing product and is used to detect a specific angle of attack.

[0097] The experimental implementation scheme of the present invention is specifically:

[0098] The test wind speed of the present invention is specifically selected according to different test requirements, specifically 50m / s 2 、60m / s 2 , 70m / s 2 , 80m / s 2 or 90m / s 2 ;

[0099] The angle of attack of the present invention is specifically: -50°, -40°, -30°, -25°, -20°, -10°, 0°, 10°, 20°, 25°, 30°, 40° or 50°, and the angle of attack sensor is used to detect the angle of attack.

[0100] The data collection process of the present invention is to use a balance to collect the lift and pitch moment curves of the model, and this collection process is a prior art.

[0101] The high-precision multi-directional load test method of the present invention is:

[0102] When the longitudinal center axis of the conical connecting rod 3-1 in the secondary angle of attack mechanism 3 is in a horizontal state, the secondary angle of attack mechanism 3 is in the zero position state, which is the initial state of the test. The test target model 10 is installed on the conical connecting rod 3-1. At this time, the sliding seat body 22 in the primary angle of attack mechanism 2 is in the middle of the arc slide rail 21. The inclinometer is used to detect whether the test target model 10 is in the installation zero position. If the inclinometer detects that the test target model 10 is not in the installation zero position, the position of the sliding seat body 22 in the primary angle of attack mechanism 2 and the horizontal position of the conical connecting rod 3-1 are continued to be adjusted until the test target model 10 is in the installation zero position. If the inclinometer detects that the test target model 10 is in the installation zero position, the zero position is set as the absolute reference point. Use the inclinometer to determine the relationship equation between the angle of attack sensor voltage and the angle of attack ,Right now Confirm the relationship between the angle of attack and the telescopic amount of the telescopic end 3-3-1 in the telescopic cylinder 3-3 and the up and down movement of the bidirectional guide assembly 15. See Table 1 below for specific data:

[0103] Table 1 Relationship between the angle of attack and the telescopic amount of the telescopic end 3-3-1 in the telescopic cylinder 3-3 and the vertical movement of the bidirectional guide assembly 15

[0104]

[0105] The first case: the present invention is at 50m / s 2 Wind speed test process:

[0106] The test target model 10 is moved to -50°. The specific process is that when the lower end of the scimitar body 23 is set at the left end of the arc-shaped slide rail 21 through the sliding seat body 22, the first-level angle of attack mechanism 2 and the second-level angle of attack mechanism 3 are in the fourth limit position state. When the telescopic cylinder 3-3 is in the extended state, the telescopic rod 3-3-1 of the telescopic cylinder 3-3 drives the test target model 10 on the tapered connecting rod 3-1 to make a downward movement through the three-pronged connecting piece 3-2. At this time, the first articulated seat 6 is in the limit state of counterclockwise rotation. The angle between the plane where the top surface of the large gear turntable 12 is located and the axis of the length direction of the test target model 10 is C. The limit state of the test target model 10 making a downward movement is that the angle C is -50°.

[0107] Drive the wind tunnel to start blowing wind and make the wind speed reach 50m / s 2 ;

[0108] The computer collects load data when the test target model 10 is at -50°;

[0109] The telescopic rod 3-3-1 of the telescopic cylinder 3-3 of the secondary angle of attack mechanism 3 and the up and down movement of the bidirectional guide assembly 15 are operated. The corresponding movement amounts are shown in Table 1, so that the test target model 10 reaches -40°, -30°, and -25° respectively, and the corresponding load data are collected;

[0110] Run the first-stage angle of attack mechanism 2 to make the test target model 10 reach -20°, -10°, 0°, 10°, 20°, and 25° respectively, and collect corresponding load data;

[0111] The telescopic rod 3-3-1 of the telescopic cylinder 3-3 of the secondary angle of attack mechanism 3 and the up and down movement of the bidirectional guide assembly 15 are operated. The corresponding movement amounts are shown in Table 1, so that the test target model 10 reaches 30°, 40°, and 50° respectively, and the corresponding load data are collected, thereby completing a continuous and coherent test process.

[0112] The second situation: the present invention is at 60m / s 2 , 70m / s 2 , 80m / s 2 , 90m / s 2 Test process under wind speed:

[0113] In order to ensure the consistency of the test state of the present invention, the wind tunnel is stopped, and the first-stage angle of attack mechanism 2 and the second-stage angle of attack mechanism 3 are operated to keep the angle of attack of the test target model 10 at -50°.

[0114] Drive the wind tunnel to start blowing wind and make the wind speed reach 50m / s 2 ;

[0115] The computer collects load data when the test target model 10 is at -50°;

[0116] The telescopic rod 3-3-1 of the telescopic cylinder 3-3 of the secondary angle of attack mechanism 3 and the up and down movement of the bidirectional guide assembly 15 are operated. The corresponding movement amounts are shown in Table 1, so that the test target model 10 reaches -40°, -30°, and -25° respectively, and the corresponding load data are collected;

[0117] Run the first-stage angle of attack mechanism 2 to make the test target model 10 reach -20°, -10°, 0°, 10°, 20°, and 25° respectively, and collect corresponding load data;

[0118] The telescopic rod 3-3-1 of the telescopic cylinder 3-3 of the secondary angle of attack mechanism 3 and the up and down movement of the bidirectional guide assembly 15 are operated. The corresponding movement amounts are shown in Table 1, so that the test target model 10 reaches 30°, 40°, and 50° respectively, and the corresponding load data are collected, thereby completing a continuous and coherent test process.

[0119] The test data of the present invention is compared and verified with existing longitudinal test data from different wind tunnels and combined with Table 2. The verification results show that the consistency of the longitudinal force and moment of the present invention is good. The repeatability accuracy of the test of the present invention can meet the existing relevant high standards. The following Table 2 shows the repeatability accuracy indicators.

[0120] Table 2 Repeatability accuracy index

[0121]

Claims

1. A high angle of attack tail boom system, characterized by: The invention comprises a high-precision support frame (1), a first-stage angle of attack mechanism (2) and a second-stage angle of attack mechanism (3), wherein the first-stage angle of attack mechanism (2) and the second-stage angle of attack mechanism (3) are both pitch attitude mechanisms, the high-precision support frame (1) is provided with a first-stage angle of attack mechanism (2), the first-stage angle of attack mechanism (2) comprises an arc-shaped slide rail (21), a sliding seat body (22) and a scimitar body (23), the arc-shaped slide rail (21) is fixedly connected to the high-precision support frame (1), and the arc-shaped slide rail (21) is fixedly connected to the high-precision support frame (1). ) is driven by the sliding seat (22) to make horizontal rotation movement and / or vertical lifting movement, the arc-shaped slide rail (21) is slidably matched with a sliding seat (22), the lower end of the scimitar body (23) is detachably connected to the sliding seat (22), the upper end of the scimitar body (23) is provided with a secondary angle of attack mechanism (3), the secondary angle of attack mechanism (3) is provided with a test target model (10), and the test target model (10) is driven by the sliding seat (22) and the secondary angle of attack mechanism (3) to make a composite multi-angle pitching movement; The high-precision support frame (1) includes a main frame (11), a large gear turntable (12), a side drive (13), a top support seat (14), four bidirectional guide components (15) and four air-floating tensioning positioning seats (16). The main frame (11) includes two mouth-shaped support frames (11-1) and two cross bars (11-2). The two mouth-shaped support frames (11-1) are vertically arranged in parallel, and the two cross bars (11-2) are horizontally arranged in parallel between the two mouth-shaped support frames (11-1). A horizontal mouth-shaped structure (11-3) is formed between the two cross bars (11-2) and the bottom of the two mouth-shaped support frames (11-1). A top support seat (14) is provided between the tops of the mouth-shaped support frames (11-1), a large gear turntable (12) is rotatably connected to the top support seat (14), a side driver (13) is provided on the top support seat (14), the side driver (13) is engaged with the large gear turntable (12), an air-floating tensioning positioning seat (16) is provided at the bottom of each end corner of the horizontal mouth-shaped structure (11-3), four bidirectional guide assemblies (15) are vertically arranged in parallel on the main frame (11), and the top support seat (14) makes a reciprocating lifting motion along the height direction of the main frame (11) through the four bidirectional guide assemblies (15); Each bidirectional guide assembly (15) includes a first linear slide (15-1), a second linear slide (15-2), a guide connecting seat (15-3), a guide rod (15-4) and an L-shaped connecting block (15-5). The guide connecting seat (15-3) is arranged on the top of the horizontal mouth-shaped structure (11-3). A connecting plate (15-6) is vertically arranged on the outer wall of the mouth-shaped support frame (11-1). The bottom of the connecting plate (15-6) is fixedly connected to the guide connecting seat (15-3). The top support seat (14) is a square seat. The L-shaped connecting block (15-5) is arranged on the top support seat (14). ), the first linear slide (15-1) is vertically arranged on the outer wall of the connecting plate (15-6), the second linear slide (15-2) is vertically arranged on the outer wall of the mouth-shaped support frame (11-1), the outer wall of one end of the L-shaped connecting block (15-5) is fixedly connected to the sliding part of the first linear slide (15-1), the outer wall of the other end of the L-shaped connecting block (15-5) is fixedly connected to the sliding part of the second linear slide (15-2), the guide rod (15-4) is vertically arranged on the guide connecting seat (15-3), and the top end of the guide rod (15-4) is slidably matched with the outer wall of the L-shaped connecting block (15-5); Four air-floating tensioning positioning seats (16) are provided in conjunction with a bottom frame (4), the bottom frame (4) being a square frame, and an air-floating tensioning positioning seat (16) correspondingly provided at each end corner of the bottom frame (4), each air-floating tensioning positioning seat (16) comprising an upper support plate (16-1), a tensioning column (16-2) and an air-floating seat (16-3), the upper support plate (16-1) being horizontally provided on the bottom frame (4), the end of the main frame (11) being provided on the upper support plate (16-1), and the air-floating seat (16-3) being provided on the upper support plate (16-1). 1), a plurality of air cushion claws (16-4) are provided at the bottom of the air floating seat (16-3), the tensioning column (16-2) is vertically penetrated on the upper support plate (16-1), the top end of the tensioning column (16-2) is a control end, and the bottom end of the tensioning column (16-2) is a telescopic end (16-6), the control end of the tensioning column (16-2) drives the telescopic end to extend downward or retract upward, and when the telescopic end of the tensioning column (16-2) and the plurality of air cushion claws (16-4) are on the same horizontal plane, the bottom frame (4) is in a fixed position state.

2. The high angle of attack tail boom system according to claim 1, characterized in that: The arc-shaped slide rail (21) includes a strip-shaped bottom plate (21-1), two vertical plates (21-2), two arc-shaped racks (21-3) and two single-body slide rails (21-4). The strip-shaped bottom plate (21-1) is fixedly connected to the top surface of the large gear turntable (12) along the radial direction of the large gear turntable (12). The two vertical plates (21-2) are arranged in parallel on the strip-shaped bottom plate (21-1). The length direction of the vertical plate (21-2) is the same as the length direction of the strip-shaped bottom plate (21-1). The top side of each vertical plate (21-2) is an arc-shaped side (21-5). One single-body slide rail (21-4) is arranged on the outer side of each arc-shaped side (21-5). The sliding seat body (22) is a U-shaped seat body. The sliding seat body (22) is buckled between the two vertical plates (21-2). There is a clearance fit between the bottom of the sliding seat body (22) and the arc-shaped sides (21-5) of the two vertical plates (21-2). The two single-body slide rails (21-4) are in sliding fit with the inner walls on both sides of the sliding seat body (22). One arc-shaped rack (21-3) is arranged on the inner side of each arc-shaped side (21-5). A plurality of teeth (21-5) are evenly distributed at the bottom of each arc-shaped rack (21-3).

3. The high angle of attack tail boom system according to claim 2, characterized in that: An inner driver (5) is arranged between the two vertical plates (21-2). The inner driver (5) includes a double-shaft drive motor (5-1) and two small gears (5-2). The double-shaft drive motor (5-1) is arranged at the bottom of the sliding seat body (22). One small gear (5-2) is sleeved on each of the two power output shafts of the double-shaft drive motor (5-1). The small gears (5-2) are in meshing fit with the arc-shaped racks (21-3).

4. A high angle of attack tail boom system according to claim 1 or 3, characterized in that: The secondary angle of attack mechanism (3) includes a conical connecting rod (3-1), a three-prong connecting piece (3-2) and a telescopic cylinder (3-3). The three-prong connecting piece (3-2) is a T-shaped connecting rod. A first hinge seat (6) is arranged at the top end of the curved knife body (23). A second hinge seat (7) is arranged on the outer side wall of the curved knife body (23). The first hinge seat (6) is hinged to the first end of the three-prong connecting piece (3-2). The second end of the three-prong connecting piece (3-2) is connected to one end of the conical connecting rod (3-1). The other end of the conical connecting rod (3-1) is connected to the test target model (10). The third end of the three-prong connecting piece (3-2) is hinged to the telescopic end of the telescopic cylinder (3-3). The bottom of the telescopic cylinder (3-3) is hinged to the second hinge seat (7).

5. The high angle of attack tail boom system according to claim 1, characterized in that: The central angle corresponding to the arc-shaped slide rail (21) is angle A, and the central angle corresponding to the curved knife body (23) is angle B, and angle B is less than or equal to angle A.

6. A high-precision multi-directional load test method implemented by using a large angle of attack tail support system according to claim 4, characterized in that: Run the test target model (10) to the limit angle of the primary angle of attack mechanism (2) and / or the secondary angle of attack mechanism (3); Drive the wind tunnel to start blowing wind so that the wind speed reaches the predetermined wind speed required for the test; The computer collects the load data of the test target model (10) when it is at the limit angle of the primary angle of attack mechanism (2) and / or the secondary angle of attack mechanism (3); The telescopic rod (3-3-1) of the telescopic cylinder (3-3) of the secondary angle of attack mechanism (3) and the up and down movement of the bidirectional guide assembly (15) are operated, and the corresponding movement amounts are obtained through a standard table, so that the test target model (10) reaches -40°, -30°, and -25° respectively, and the corresponding load data are collected; Run the first-stage angle of attack mechanism (2) to make the test target model (10) reach -20°, -10°, 0°, 10°, 20°, and 25° respectively, and collect corresponding load data; The telescopic rod (3-3-1) of the telescopic cylinder (3-3) of the secondary angle of attack mechanism (3) and the up and down movement of the bidirectional guide assembly (15) are operated. The corresponding movement amounts are obtained through the standard table, so that the test target model (10) reaches 30°, 40°, and 50° respectively, and the corresponding load data are collected, thereby completing a continuous and coherent test process.

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