Wing model lift force testing device

Abstract

The utility model discloses a wing model lift force testing device which comprises a strain gauge body and an L-shaped fixing plate, the fixing plate comprises a horizontal section and a vertical section fixedly connected with one side of the upper end of the horizontal section, a fixing hole is formed in the middle position penetrating through the outer wall of the vertical section, and a fixing seat extending out of the rear end of the fixing hole is detachably connected in the fixing plate. A fixing buckle with the upper end and the front end opened is arranged at the front end of the fixing base, a fixing rod extending out of the opening in the front end of the fixing buckle is rotationally connected between the front ends of the left side and the right side of the inner wall of the fixing buckle in a matched mode, a fixing ring is arranged at the front end of the fixing rod, a pressure rod is arranged at the rear end of the fixing rod, and a pressure sensor is installed at the rear end of the bottom of the inner wall of the fixing buckle. A plurality of strain gauges are mounted on the outer wall, extending out of the front end opening of the fixing buckle, of the fixing rod; and a control panel is arranged on one side of the upper end of the outer wall of the strain gauge body. According to the utility model, the volume is small, the installation and the disassembly are convenient, the movement of the model is not influenced during the test, and the measurement accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lift testing, in particular to a wing model lift testing device. Background Art

[0002] Bernoulli's principle is a basic principle of flight: the expression of Bernoulli's principle on the wing is that the relative movement of the wing in the air cuts the air into two parts, the upper part of the wing is more convex than the lower part, and according to Bernoulli's principle, in order to maintain continuous air on the upper surface of the wing, the air must flow through it at a faster speed than the lower part, and finally converge at the trailing edge of the wing at the same time. The fluid flow rate is inversely proportional to the pressure here, so negative pressure is formed on the wing with a fast flow rate, and the pressure under the wing is greater than that on the wing, so a pressure difference is formed, which is the so-called lift, thereby causing the wing model to rise.

[0003] The lift device for testing the aircraft model is an essential device for conducting physical model experiments. The measuring device usually measures the force exerted on the model through a force sensor. Due to the complexity and accuracy requirements of experimental research, the existing testing devices are usually installed at the front end of the model or around the model, which will obviously affect the movement of the model, resulting in inaccurate measurements. In addition, the existing lift testing devices are relatively complex in structure, large in size and inconvenient to install and disassemble, and have certain limitations in the adaptation process. Utility Model Content

[0004] The utility model aims to provide a wing model lift test device, which has a small volume, is convenient to install and disassemble, and will not affect the movement of the model during testing, thereby improving the accuracy of measurement.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A wing model lift test device comprises a strain gauge body and a fixing plate arranged in an L shape, wherein the fixing plate comprises a horizontal section and a vertical section fixedly connected to one side of the upper end of the horizontal section, the strain gauge body is arranged on one side of the outer wall of the fixing plate, a fixing hole is provided at the middle position of the outer wall of the vertical section, a fixing seat extending out of the rear end of the fixing hole is detachably connected in the fixing plate, a fixing buckle with openings at the upper end and the front end of the fixing seat is provided at the front end, a fixing rod extending out of the front end opening and capable of deformation is provided between the front ends of the left and right sides of the inner wall of the fixing buckle, a fixing ring is provided at the front end of the fixing rod, a plurality of strain gauges distributed at equal intervals around the circumference are installed on the outer wall of the fixing rod extending out of the front end opening of the fixing buckle, the strain gauge is electrically connected to the strain gauge body through a connecting line, a control panel is provided on one side of the upper end of the outer wall of the strain gauge body, and the strain gauge body is electrically connected to the control panel.

[0007] By adopting the above technical solution, when in use, first fix the fixing seat on the fixing hole of the fixing plate, then place the fixing plate in the wind field and fix it, then connect and fix the wing model to be tested with the fixing ring on the fixing rod, then power on the device, operate the control panel to control the strain gauge body to work, the wing model in the wind field will rise under the drive of the wind force, during this process the fixing rod in the fixing buckle will be deformed under the drive of the wing model, and the deformation size of the fixing rod will be transmitted to the strain gauge body through the strain gauge through the connecting line to display the deformation data information, so that the size of the lift exerted on the wing model can be tested.

[0008] The utility model is further configured as follows: a rotating hole is provided at the rear end of the outer wall of the fixing rod, and a rotating shaft passing through the rotating hole and rotatingly connected to the left and right sides of the front end of the inner wall of the fixing buckle is rotatably connected.

[0009] The utility model is further configured as follows: a pressure rod arranged in an arc shape is arranged at the rear end of the outer wall of the fixing rod, a pressure sensor is installed at the bottom of the inner wall of the fixing buckle below the pressure rod, and the pressure sensor is electrically connected to the control panel.

[0010] By adopting the above technical solution, the lift magnitude when the wing model drives the fixed rod to rotate upward can be measured by the pressure sensor. At the same time, it can also cooperate with the strain gauge to measure more comprehensive lift numerical information from multiple angles to improve the accuracy of experimental measurement.

[0011] The utility model is further configured as follows: an outer wall of the fixing seat extending out of the rear end of the fixing hole is provided with an external thread, and a fixing nut which is threadably connected to the external thread and cooperates to fix the fixing seat is detachably connected to the rear end of the outer wall of the fixing plate.

[0012] By adopting the above technical solution, the fixing seat can be quickly installed and disassembled.

[0013] The utility model is further configured as follows: both front and rear ends of the left and right sides of the outer wall of the horizontal section are downwardly provided with fixing grooves.

[0014] By adopting the above technical solution, it is convenient to fix the fixing plate in the wind farm.

[0015] The utility model is further configured as follows: a fixing wedge is provided at the lower end of one side of the outer wall of the fixing plate to prevent the fixing plate from tipping backwards.

[0016] By adopting the above technical solution, it is possible to avoid the situation in which the fixed plate tilts backwards due to force problems during the test, thereby affecting the progress of the experiment.

[0017] In summary, the utility model has the following beneficial effects:

[0018] First, the utility model is small in size, easy to install and disassemble, and will not affect the movement of the model during testing, thereby improving the accuracy of measurement;

[0019] Secondly, the utility model can not only test the upward lift of the wing model during the test, but also test the force conditions of the wing model at different positions and angles in the wind field, so as to meet the needs of measuring multiple degrees of freedom;

[0020] Thirdly, the rotatable shaft and the rotating hole of the utility model can reduce the influence of friction on the experimental data while testing the lift of the wing model. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is mainly used to show the position and connection relationship of each component;

[0023] Figure 3 It is mainly used to show the pressure rod, that is, the pressure sensor;

[0024] Figure 4 It is mainly used to show the position connection relationship between the shaft and the hole.

[0025] In the figure: 1. Strain gauge body; 11. Fixing plate; 12. Horizontal section; 13. Vertical section; 14. Fixing groove; 15. Fixing wedge; 16. Fixing hole; 17. Fixing seat; 18. External thread; 19. Fixing nut; 2. Fixing buckle; 21. Rotating shaft; 22. Fixing rod; 23. Rotating hole; 24. Pressure rod; 25. Pressure sensor; 26. Fixing ring; 27. Strain gauge; 28. Connecting wire; 29. ​​Control panel. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example, see Figure 1-4 A wing model lift test device comprises a strain gauge body 1 and a fixing plate 11 arranged in an L shape, the fixing plate 11 comprises a horizontal section 12 and a vertical section 13 fixedly connected to one side of the upper end of the horizontal section 12, a fixing groove 14 is downwardly provided at both front and rear ends of the left and right sides of the outer wall of the horizontal section 12, a fixing wedge 15 is provided at the lower end of one side of the outer wall of the fixing plate 11 to prevent it from tipping backward, the strain gauge body 1 is arranged on one side of the outer wall of the fixing plate 11, a fixing hole 16 is provided at the middle position of the outer wall of the vertical section 13, a fixing seat 17 extending out of the rear end of the fixing hole 16 is detachably connected in the fixing plate 11, an outer wall of the fixing seat 17 extending out of the rear end of the fixing hole 16 is provided with an external thread 18, a fixing nut 19 threadedly connected to the external thread 18 and cooperating with the fixing seat 17 is detachably connected to the rear end of the outer wall of the fixing plate 11, and a fixing buckle 2 with both the upper end and the front end opened is provided at the front end of the fixing seat 17.

[0031] A fixing rod 22 extending out of the front end opening and capable of deformation is provided between the front ends of the left and right sides of the inner wall of the fixing buckle 2, a rotating hole 23 is provided at the rear end of the outer wall of the fixing rod 22, a rotating shaft 21 passing through the rotating hole 23 and rotatably connected to the left and right sides of the front end of the inner wall of the fixing buckle 2 is provided, a fixing ring 26 is provided at the front end of the fixing rod 22, an arc-shaped pressure rod 24 is provided at the rear end of the outer wall of the fixing rod 22, a pressure sensor 25 is installed at the bottom of the inner wall of the fixing buckle 2 below the pressure rod 24, four strain gauges 27 equidistantly distributed around the circumference are installed on the outer wall of the fixing rod 22 extending out of the front end opening of the fixing buckle 2, the strain gauge 27 is electrically connected to the strain gauge body 1 through a connecting line 28, a control panel 29 is provided on one side of the upper end of the outer wall of the strain gauge body 1, the strain gauge body 1 and the pressure sensor 25 are both electrically connected to the control panel 29.

[0032] Method of use: When in use, first pass the fixing seat 17 through the fixing hole 16 on the vertical section 13, then put the fixing nut 19 on the external thread 18 of the fixing seat 17, rotate the fixing nut 19 to fix the fixing seat 17 on the fixing plate 11, and then use the fixing rope to pass through the fixing groove 14 on the horizontal section 12 of the fixing plate 11 to fix the fixing plate 11 in the wind field, and the fixing wedge 15 can prevent the fixing plate 11 from tipping backward during fixation or experiment, and then connect and fix the wing model to be tested with the fixing ring 26 on the fixing rod 22, and then power on the device, operate the control panel 29 to control the operation of the strain gauge body 1, and the wing model in the wind field will rise under the drive of the wind force. In this process, the fixing rod 22 in the fixing buckle 2 will rotate upward under the drive of the wing model through the cooperation of the rotating shaft 21 and the rotating hole 23, and the rotatable rotating shaft 21 will reduce the influence of friction on the rotation of the fixing rod 22.

[0033] When the fixing rod 22 rotates upward, the lower end of the pressure rod 24 will contact the pressure sensor 25 and apply pressure to it. At the same time, the upward rotation stroke of the fixing rod 22 will be limited. At this time, the fixing rod 22 will be deformed, and the size of the deformation will be transmitted to the strain gauge body 1 through the strain gauge 27 through the connecting line 28. The data information of the deformation is displayed on the strain gauge body 1, thereby testing the size of the lift exerted on the wing model. The setting of multiple strain gauges 27 can test the forces exerted on the wing model in different directions in the wind field, so as to meet the needs of measuring multiple degrees of freedom of the wing model.

[0034] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A wing model lift test device, comprising a strain gauge body (1) and an L-shaped fixing plate (11), characterized in that: The fixing plate (11) comprises a horizontal section (12) and a vertical section (13) fixedly connected to one side of the upper end of the horizontal section (12); the strain gauge body (1) is arranged on one side of the outer wall of the fixing plate (11); a fixing hole (16) is provided at the middle position of the outer wall of the vertical section (13); a fixing seat (17) extending out of the rear end of the fixing hole (16) is detachably connected to the fixing plate (11); a fixing buckle (2) with both the upper end and the front end being open is provided at the front end of the fixing seat (17); and the fixing buckle (2) has two inner walls on the left and right sides. A fixing rod (22) extending out of the front end opening and capable of deformation is arranged between the front ends, a fixing ring (26) is arranged at the front end of the fixing rod (22), a plurality of strain gauges (27) distributed at equal intervals around the circumference are installed on the outer wall of the fixing rod (22) extending out of the front end opening of the fixing buckle (2), the strain gauges (27) are electrically connected to the strain gauge body (1) through a connecting line (28), a control panel (29) is arranged on one side of the upper end of the outer wall of the strain gauge body (1), and the strain gauge body (1) is electrically connected to the control panel (29).

2. A wing model lift test device according to claim 1, characterized in that: A rotating hole (23) is provided at the rear end of the outer wall of the fixing rod (22), and a rotating shaft (21) passing through the rotating hole (23) and rotatably connected to the left and right sides of the front end of the inner wall of the fixing buckle (2) is rotatably connected.

3. A wing model lift test device according to claim 1, characterized in that: A pressure rod (24) arranged in an arc shape is arranged at the rear end of the outer wall of the fixing rod (22), and a pressure sensor (25) is installed at the bottom of the inner wall of the fixing buckle (2) below the pressure rod (24), and the pressure sensor (25) is electrically connected to the control panel (29).

4. A wing model lift test device according to claim 1, characterized in that: The outer wall of the fixing seat (17) extending out of the rear end of the fixing hole (16) is provided with an external thread (18), and the rear end of the outer wall of the fixing plate (11) is detachably connected with a fixing nut (19) threadedly connected to the external thread (18) and cooperating to fix the fixing seat (17).

5. The wing model lift test device according to claim 1, characterized in that: The front and rear ends of the left and right outer walls of the horizontal section (12) are both provided with fixing grooves (14) downwards.

6. A wing model lift test device according to claim 1, characterized in that: A fixing wedge (15) is provided at the lower end of one side of the outer wall of the fixing plate (11) to prevent the fixing plate (11) from tipping backwards.

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