Three-point contact fixed large-size dynamic test model auxiliary locking device and method

Abstract

The invention belongs to the technical field of high-speed wind tunnel dynamic tests, and discloses a three-point contact fixed large-size dynamic test model auxiliary locking device and a three-point contact fixed large-size dynamic test model auxiliary locking method. A force measuring balance of the auxiliary locking device is a rod type balance and is located on the central axis of the dynamic test model, and the dynamic test model and the force measuring balance are connected and locked through a front conical surface; the dynamic supporting device is fixedly connected with the force measuring balance through a balance connecting flange of the rear column section; the abdomen part of the dynamic supporting device is fixedly connected with the lower locking device; the lower locking device is fixedly connected with the high-speed wind tunnel lower model mechanism; and the upper locking device is fixedly connected with the high-speed wind tunnel upper model mechanism. The auxiliary locking method comprises the following steps: installing the dynamic test model; adjusting the posture of the dynamic test model; an upper locking device is installed; checking the posture of the dynamic test model; starting the high-speed wind tunnel; the upper locking device is moved away; and carrying out a high-speed wind tunnel dynamic test. The auxiliary locking device and the locking method have important significance for evaluating the design scheme of the novel high-speed cruise aircraft.

Description

Technical Field

[0001] The invention belongs to the technical field of high-speed wind tunnel dynamic test, and in particular relates to an auxiliary locking device and method for a large-size dynamic test model fixed with three points of contact. Background Art

[0002] The new high-speed cruise aircraft adopts the front air intake + variable configuration layout, and uses high angle of attack flight to pursue high maneuverability. During the flight, there are obvious unsteady aerodynamic effects, which in turn cause strong aerodynamic, motion and inertial coupling effects. Quantitative evaluation and accurate design of these coupling effects are key technical issues that must be solved in the design of new high-speed cruise aircraft.

[0003] At present, wind tunnel virtual flight test is one of the main means of designing, verifying and evaluating the coupling of aerodynamics, motion and control of high-speed aircraft. Wind tunnel virtual flight test equipment mainly includes dynamic test model, dynamic support device, variable configuration device, variable center of mass device and steering gear system. Wind tunnel virtual flight test generally adopts low damping dynamic support device and dynamic test model whose dynamic support mass characteristics match the real aircraft, and realizes attitude control simulation of aircraft model in wind tunnel through variable configuration, variable center of mass and rudder control.

[0004] The new high-speed cruise aircraft adopts the front air inlet + variable configuration layout, and the center of rotation of the dynamic support device coincides with the center of mass of the dynamic test model. This puts forward high requirements on the design of the wind tunnel dynamic test model and device of the new high-speed cruise aircraft, especially the design of the dynamic support device. First, the dynamic test model adopts the front air inlet + variable configuration layout, which leads to a small space allowed for use in the dynamic test model, a large model size, a large aerodynamic load on the model, and a high load-bearing capacity requirement for the dynamic support device; second, there is competition for the installation space of the variable configuration device, the variable center of mass device and the dynamic support device, so the volume of the dynamic support device must be as small as possible, and the dynamic test model must be flexible in movement and the damping of the dynamic support device must be small; third, the initial posture of the dynamic test model is required to be fixed during the wind tunnel test, and the dynamic support device must have the ability to automatically lock and unlock; fourth, the dynamic support device must have the ability to measure the motion parameters of the dynamic test model in real time. In short, the dynamic support device is required to meet the functions of small volume, low damping, high load-bearing capacity, automatic locking, automatic unlocking and model attitude measurement. However, even if the dynamic support device meets the above four requirements, since the dynamic support device adopts a nested locking method, it can only meet the initial attitude fixing capability of the dynamic test model after the wind tunnel flow field is stabilized.

[0005] Due to the large size of the dynamic test model and the high parameters of the wind tunnel simulated flow field, the impact load of the high-speed wind tunnel switch car is much greater than the aerodynamic load applied to the dynamic test model when the wind tunnel flow field is stable. The automatic locking and unlocking device of the dynamic support device designed within the limited allowable space does not have the ability to ensure the initial posture fixation of the dynamic test model when it is subjected to large impacts during wind tunnel start-up and shutdown. As a result, the dynamic test model is difficult to lock and support when the wind tunnel is switched on and off, and the smooth implementation of the wind tunnel virtual flight test cannot be guaranteed, and even damage to the wind tunnel virtual flight test device is caused. At present, the locking and support of the dynamic test model when the wind tunnel is switched on and off is still a technical problem that has not been fully solved.

[0006] Currently, there is an urgent need to develop an auxiliary locking device and method for a large-scale dynamic test model with three-point contact fixation. Summary of the invention

[0007] One technical problem to be solved by the present invention is to provide an auxiliary locking device for a large-sized dynamic test model fixed with three points of contact. Another technical problem to be solved by the present invention is to provide an auxiliary locking method for a large-sized dynamic test model fixed with three points of contact, so as to solve the problem that the dynamic test model is difficult to lock and support when the vehicle is switched on and off in a wind tunnel.

[0008] The three-point contact fixed large-size dynamic test model auxiliary locking device of the present invention comprises a dynamic test model, a force measuring balance, a dynamic support device, a lower locking device and an upper locking device; The force balance is a rod-type balance, which is located on the central axis of the dynamic test model. The dynamic test model and the force balance are connected and locked through the front cone; the dynamic support device and the force balance are connected and fixed through the balance connecting flange of the rear column section; the belly of the dynamic support device is fixedly connected to the lower locking device; the lower locking device is fixedly connected to the lower model mechanism of the high-speed wind tunnel; and the upper locking device is fixedly connected to the upper model mechanism of the high-speed wind tunnel.

[0009] Further, the lower locking device is located below the symmetry plane and the central axis of the dynamic test model, and is used to achieve single-point fixed locking of the dynamic test model, and includes a belly support rod and a lower support plate connected in sequence; The dynamic support device is connected to the belly support rod by means of cone pin positioning and bolt locking, the belly support rod is connected to the lower support plate by bolts, and the lower support plate is fixedly connected to the lower model mechanism of the high-speed wind tunnel by bolts.

[0010] Furthermore, the upper locking device is located above the symmetry plane and the central axis of the dynamic test model, and is used to achieve two-point fixed locking of the dynamic test model, and includes an upper support plate, a front locking structure and a rear locking structure; The top surface of the upper support plate is fixedly connected to the upper model mechanism of the high-speed wind tunnel; A front locking structure is installed at the front end of the bottom surface of the upper support plate, and the front locking structure presses the upper surface of the front section of the dynamic test model; a rear locking structure is installed at the rear end of the bottom surface of the upper support plate, and the rear locking structure presses the upper surface of the rear section of the dynamic test model.

[0011] Furthermore, the front locking structure and the rear locking structure have the same structure, both including a flexible pressing plate and an adjusting knob, the flexible pressing plate presses the upper surface of the dynamic test model, and the adjusting knob is used to adjust the pressing force of the flexible pressing plate.

[0012] The three-point contact fixed large-size dynamic test model auxiliary locking method of the present invention comprises the following steps: S10. Install the dynamic test model; The dynamic support device is fixedly connected to the force measuring balance via the balance connecting flange of the rear column section of the force measuring balance; The belly of the dynamic support device is fixedly connected to the belly support rod by means of cone pin positioning and bolt locking; Connect the belly support rod to the lower support plate through bolts; The lower support plate is fixedly connected to the lower model structure of the high-speed wind tunnel by bolts; The dynamic test model is connected to the force balance by locking the front cone surface of the force balance; S20. Adjust the dynamic test model posture; Adjust the attack angle, sideslip angle and roll angle of the dynamic test model so that the dynamic test model reaches the initial posture; S30. Install the locking device; The top surface of the upper support plate is fixedly connected to the upper model mechanism of the high-speed wind tunnel; The front locking structure is placed on the upper surface of the front section of the dynamic test model, and the rear locking structure is subsequently placed on the upper surface of the rear section of the dynamic test model; Adjust the pressing force of the flexible pressing piece by adjusting the adjustment knob to ensure that the front and rear flexible pressing pieces both press the dynamic test model; S40. Check the dynamic test model posture; Review and adjust the attack angle, sideslip angle and roll angle of the dynamic test model to ensure that the dynamic test model is in the initial posture; S50. Start the high-speed wind tunnel; Start the high-speed wind tunnel until the flow field in the high-speed wind tunnel is stable; S60. Remove the upper locking device; The upper model mechanism of the high-speed wind tunnel drives the upper locking device to move away from the upper surface of the dynamic test model and is lifted to the outside of the high-speed wind tunnel flow field; S70. Conduct high-speed wind tunnel dynamic tests; After the high-speed wind tunnel flow field is stabilized, the high-speed wind tunnel dynamic test is carried out according to the test schedule; S80. Fixed dynamic test model; After the high-speed wind tunnel dynamic test is completed, the upper locking device is lowered to compact the dynamic test model to avoid vehicle shutdown shock, and the high-speed wind tunnel is closed after compaction.

[0013] The three-point contact fixed large-scale dynamic test model auxiliary locking device and method of the present invention adopts the belly support rod of the dynamic support device as a contact point of the dynamic test model, and at the same time uses the upper model mechanism of the high-speed wind tunnel to fix the upper support plate, and a locking structure is designed at each end of the bottom surface of the upper support plate. Each locking structure has an adjustable flexible pressing plate. These two flexible pressing plates serve as the other two contact points of the dynamic test model. The auxiliary locking of the dynamic test model when the high-speed wind tunnel is switched on and off is achieved through the three contact points.

[0014] The auxiliary locking device for a large-scale dynamic test model fixed by three-point contact of the present invention has a simple structure, compact size, high overall rigidity and convenient operation; the auxiliary locking method for a large-scale dynamic test model fixed by three-point contact of the present invention adopts an upper locking device and a lower locking device for fixing, and supports the dynamic test model and the test device through three-point contact locking, thereby ensuring that the dynamic test model can withstand the large impact during the start and stop of the high-speed wind tunnel and maintain the initial posture, and ensuring the smooth implementation of the virtual flight test simulation of the pitch freedom wind tunnel of a new high-speed cruise aircraft adopting a front air inlet + variable configuration layout.

[0015] The three-point contact fixed large-scale dynamic test model auxiliary locking device and method of the present invention are of great significance for conducting pitch freedom wind tunnel virtual flight tests of new high-speed cruise aircraft, simulating the aerodynamic, motion and inertial coupling characteristics of new high-speed cruise aircraft, and evaluating the design scheme of new high-speed cruise aircraft, and have engineering practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the auxiliary locking device of a large-scale dynamic test model fixed with three points of contact according to the present invention; Figure 2 It is a schematic diagram of the overall structure of the locking device of the auxiliary locking device of the large-scale dynamic test model fixed with three points of contact according to the present invention; Figure 3 It is a schematic diagram of the upper locking device in the auxiliary locking device of the large-scale dynamic test model with three-point contact fixation of the present invention.

[0017] In the figure, 1. dynamic test model; 2. force balance; 3. dynamic support device; 4. lower locking device; 5. upper locking device; 6. balance connecting flange; 7. lower support plate; 8. belly support rod; 9. upper support plate; 10. front locking structure; 11. rear locking structure; 12. flexible pressure plate; 13. adjustment knob. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0019] Example: Figure 1~Figure 3 As shown, the three-point contact fixed large-size dynamic test model auxiliary locking device of this embodiment includes a dynamic test model 1, a force measuring balance 2, a dynamic support device 3, a lower locking device 4 and an upper locking device 5; The force balance 2 is a rod-type balance, which is located on the central axis of the dynamic test model 1. The dynamic test model 1 and the force balance 2 are connected and locked through the front cone; the dynamic support device 3 and the force balance 2 are connected and fixed through the balance connecting flange 6 of the rear column section; the belly of the dynamic support device 3 is fixedly connected to the lower locking device 4; the lower locking device 4 is fixedly connected to the lower model mechanism of the high-speed wind tunnel; the upper locking device 5 is fixedly connected to the upper model mechanism of the high-speed wind tunnel.

[0020] Furthermore, the lower locking device 4 is located below the symmetry plane and the central axis of the dynamic test model 1, and is used to achieve single-point fixed locking of the dynamic test model 1, and includes a belly support rod 8 and a lower support plate 7 connected in sequence; The dynamic support device 3 is connected to the belly support rod 8 by means of cone pin positioning and bolt locking. The belly support rod 8 is connected to the lower support plate 7 by bolts. The lower support plate 7 is fixedly connected to the lower model mechanism of the high-speed wind tunnel by bolts.

[0021] Furthermore, the upper locking device 5 is located above the symmetry plane and the central axis of the dynamic test model 1, and is used to achieve two-point fixed locking of the dynamic test model 1, and includes an upper support plate 9, a front locking structure 10 and a rear locking structure 11; The top surface of the upper support plate 9 is fixedly connected to the upper model mechanism of the high-speed wind tunnel; A front locking structure 10 is installed at the front end of the bottom surface of the upper support plate 9, and the front locking structure 10 presses the upper surface of the front section of the dynamic test model 1; a rear locking structure 11 is installed at the rear end of the bottom surface of the upper support plate 9, and the rear locking structure 11 presses the upper surface of the rear section of the dynamic test model 1.

[0022] Furthermore, the front locking structure 10 and the rear locking structure 11 have the same structure, both including a flexible compression plate 12 and an adjusting knob 13 . The flexible compression plate 12 compresses the upper surface of the dynamic test model 1 , and the adjusting knob 13 is used to adjust the pressing force of the flexible compression plate 12 .

[0023] The three-point contact fixed large-scale dynamic test model auxiliary locking method of this embodiment includes the following steps: S10. Install dynamic test model 1; The dynamic support device 3 is fixedly connected to the force measuring balance 2 via the balance connecting flange 6 of the rear column section of the force measuring balance 2; The belly of the dynamic support device 3 is fixedly connected to the belly support rod 8 by means of cone pin positioning and bolt locking; Connect the belly support rod 8 to the lower support plate 7 by bolts; The lower support plate 7 is fixedly connected to the lower model mechanism of the high-speed wind tunnel by bolts; The dynamic test model 1 is locked and connected with the force measuring balance 2 via the front cone surface of the force measuring balance 2; S20. Adjust the posture of the dynamic test model 1; Adjust the attack angle, sideslip angle and roll angle of the dynamic test model 1 so that the dynamic test model 1 reaches an initial posture; S30. Install the locking device 5; The top surface of the upper support plate 9 is fixedly connected to the upper model mechanism of the high-speed wind tunnel; The front locking structure 10 is placed on the upper surface of the front section of the dynamic test model 1, and the rear locking structure 11 is subsequently placed on the upper surface of the rear section of the dynamic test model 1; By adjusting the adjusting knob 13, the pressing force of the flexible pressing sheet 12 is adjusted to ensure that the front and rear flexible pressing sheets 12 both press the dynamic test model 1; S40. Check the posture of the dynamic test model 1; Review and adjust the attack angle, sideslip angle and roll angle of the dynamic test model 1 to ensure that the dynamic test model 1 is in the initial posture; S50. Start the high-speed wind tunnel; Start the high-speed wind tunnel until the flow field in the high-speed wind tunnel is stable; S60. Remove the upper locking device 5; The upper model mechanism of the high-speed wind tunnel drives the upper locking device 5 to move away from the upper surface of the dynamic test model 1 and is lifted to the outside of the high-speed wind tunnel flow field; S70. Conduct high-speed wind tunnel dynamic tests; After the high-speed wind tunnel flow field is stabilized, the high-speed wind tunnel dynamic test is carried out according to the test schedule; S80. Fixed dynamic test model 1; After the high-speed wind tunnel dynamic test is completed, the upper locking device 5 is lowered to press the dynamic test model 1 to avoid the vehicle shutdown shock, and the high-speed wind tunnel is closed after pressing.

[0024] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. For those familiar with the art, all features disclosed in the present invention, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A three-point contact fixed large-scale dynamic test model auxiliary locking device, characterized in that: The auxiliary locking device comprises a dynamic test model (1), a force measuring balance (2), a dynamic support device (3), a lower locking device (4) and an upper locking device (5); The force measuring balance (2) is a rod-type balance, which is located on the central axis of the dynamic test model (1); the dynamic test model (1) and the force measuring balance (2) are connected and locked via a front cone; the dynamic support device (3) and the force measuring balance (2) are connected and fixed via a balance connecting flange (6) of the rear column section; the belly of the dynamic support device (3) is fixedly connected to the lower locking device (4); the lower locking device (4) is fixedly connected to the lower model mechanism of the high-speed wind tunnel; and the upper locking device (5) is fixedly connected to the upper model mechanism of the high-speed wind tunnel.

2. The three-point contact fixed large-scale dynamic test model auxiliary locking device according to claim 1 is characterized in that: The lower locking device (4) is located below the symmetry plane and the central axis of the dynamic test model (1) and is used to achieve single-point fixed locking of the dynamic test model (1), and comprises a belly support rod (8) and a lower support plate (7) connected in sequence; The dynamic support device (3) is connected to the belly support rod (8) by means of cone pin positioning and bolt locking, the belly support rod (8) is connected to the lower support plate (7) by bolts, and the lower support plate (7) is fixedly connected to the lower model mechanism of the high-speed wind tunnel by bolts.

3. The three-point contact fixed large-scale dynamic test model auxiliary locking device according to claim 1 is characterized in that: The upper locking device (5) is located above the symmetry plane and the central axis of the dynamic test model (1) and is used to achieve two-point fixed locking of the dynamic test model (1), and comprises an upper support plate (9), a front locking structure (10) and a rear locking structure (11); The top surface of the upper support plate (9) is fixedly connected to the upper model mechanism of the high-speed wind tunnel; A front locking structure (10) is installed at the front end of the bottom surface of the upper support plate (9), and the front locking structure (10) presses the upper surface of the front section of the dynamic test model (1); and a rear locking structure (11) is installed at the rear end of the bottom surface of the upper support plate (9), and the rear locking structure (11) presses the upper surface of the rear section of the dynamic test model (1).

4. The three-point contact fixed large-scale dynamic test model auxiliary locking device according to claim 3 is characterized in that: The front locking structure (10) and the rear locking structure (11) have the same structure, both comprising a flexible pressing piece (12) and an adjusting knob (13), wherein the flexible pressing piece (12) presses the upper surface of the dynamic test model (1), and the adjusting knob (13) is used to adjust the pressing force of the flexible pressing piece (12).

5. A three-point contact fixed large-scale dynamic test model auxiliary locking method, which is used for the three-point contact fixed large-scale dynamic test model auxiliary locking device described in any one of claims 1 to 4, characterized in that: The auxiliary locking method comprises the following steps: S10. Install the dynamic test model (1); The dynamic support device (3) is fixedly connected to the force measuring balance (2) via a balance connecting flange (6) of the rear column section of the force measuring balance (2); The belly of the dynamic support device (3) is fixedly connected to the belly support rod (8) by means of positioning with a cone pin and locking with bolts; Connecting the belly support rod (8) to the lower support plate (7) by means of bolts; The lower support plate (7) is fixedly connected to the lower model structure of the high-speed wind tunnel by means of bolts; The dynamic test model (1) is locked and connected to the force measuring balance (2) via the front cone surface of the force measuring balance (2); S20. Adjust the dynamic test model (1) posture; Adjusting the attack angle, sideslip angle, and roll angle of the dynamic test model (1) so that the dynamic test model (1) reaches an initial posture; S30. Install the locking device (5); The top surface of the upper support plate (9) is fixedly connected to the upper model mechanism of the high-speed wind tunnel; The front locking structure (10) is placed on the upper surface of the front section of the dynamic test model (1), and the rear locking structure (11) is subsequently placed on the upper surface of the rear section of the dynamic test model (1); By adjusting the adjustment knob (13), the pressing force of the flexible pressing piece (12) is adjusted to ensure that the front and rear flexible pressing pieces (12) both press the dynamic test model (1); S40. Check the dynamic test model (1) posture; Review and adjust the attack angle, sideslip angle, and roll angle of the dynamic test model (1) to ensure that the dynamic test model (1) is in the initial posture; S50. Start the high-speed wind tunnel; Start the high-speed wind tunnel until the flow field in the high-speed wind tunnel is stable; S60. Remove the upper locking device (5); The upper model mechanism of the high-speed wind tunnel drives the upper locking device (5) to move away from the upper surface of the dynamic test model (1) and to be lifted outside the flow field of the high-speed wind tunnel; S70. Conduct high-speed wind tunnel dynamic tests; After the high-speed wind tunnel flow field is stabilized, the high-speed wind tunnel dynamic test is carried out according to the test schedule; S80. Fixed dynamic test model (1); After the high-speed wind tunnel dynamic test is completed, the upper locking device (5) is lowered to compress the dynamic test model (1) to avoid the impact of shutting down the vehicle, and the high-speed wind tunnel is closed after compression.

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