Tire deformation characteristic test device and method

Abstract

The invention provides a tire deformation characteristic test device and method. The tire deformation characteristic test device comprises a frame, a first loading cylinder and a rotary swing cylinder, a first sensor is arranged at the telescopic end of the first loading cylinder, a first supporting frame is arranged at the top of the first sensor, the first supporting frame is connected with a second supporting frame through a second sliding rail, the second sliding rail extends in the lateral direction X, and the second sliding rail is connected with a second supporting frame through a second sliding rail. A third sensor and a force bearing platform are sequentially arranged at the top of the second supporting frame, the two ends of the first supporting frame are slidably connected with the inner surface of the frame, a second loading cylinder is installed at the upper end of the first supporting frame, and the telescopic end of the second loading cylinder is connected with the second supporting frame through a second sensor; and the rotary oscillating cylinder is connected with a tool for clamping a tire through a bearing. Characteristic testing of the tire under the condition that loads are applied in different directions is achieved, rapid adaptation is achieved, and universality is high.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation product testing, and particularly relates to a test device and method for tire deformation characteristics. Background Art

[0002] The simulation calculation and analysis of the shimmy characteristics of the nose landing gear is one of the key basic links in the design of the landing gear and also one of the main means for the anti-shimmy performance design of the nose landing gear. There are many influencing factors for the occurrence of landing gear shimmy, mainly including the damping of the shimmy damper, tire characteristic parameters, landing gear strut stiffness, fuselage stiffness, stability distance, taxiing speed and load, etc. Among them, the tire characteristics have a greater impact on the shimmy performance of the landing gear, and there are many characteristic parameters of the tire that affect the shimmy performance of the landing gear, mainly including deformation characteristic parameters such as the tire lateral stiffness coefficient, tire torsional stiffness coefficient, tire longitudinal stiffness coefficient, and tire radial stiffness coefficient. Therefore, it is necessary to design a set of test devices for tire deformation characteristics to solve this problem.

[0003] As Figure 1 shown, a further description is made of the loads in various directions received by the tire during the ground taxiing of the conventional landing gear structure. The main rotation axis 20 of the landing gear and the landing gear retraction actuator 30 are integrally fixed to the aircraft body after being connected to the landing gear outer cylinder 40. One end of the landing gear piston rod 50 is connected to the landing gear outer cylinder 3 in a dynamic seal form, and the other end is fixedly connected to the wheel axle 60. The wheel axle 60 fixes the landing gear tire 6. When the landing gear performs flight landing and ground taxiing, one end of the landing gear piston rod 50 cooperates with the landing gear outer cylinder 3 to absorb a part of the energy through compression, and the remaining energy is absorbed through the deformation of the landing gear tire 10, that is, the landing gear tire 10 is subjected to radial force and course force. When the ground is uneven, it also needs to be subjected to the combined loading of lateral force. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device and method for tire deformation characteristics, which can solve the characteristic test of the tire under the application of loads in different directions, and can be quickly adapted to landing gears of different specifications and different loads, with high versatility.

[0005] The technical solution of the present invention is: a tire deformation characteristic test device, including a frame, a first loading cylinder disposed at the bottom of the frame and telescoping radially, and a rotary swing cylinder disposed at the top of the frame and capable of rotating and swinging along the Z-axis top. A first sensor is provided on the telescoping end of the first loading cylinder. A first support frame is provided on the top of the first sensor. The first support frame is connected to a second support frame through a second slide rail. The second slide rail extends along the lateral X direction. A third sensor and a load-bearing platform are sequentially arranged on the top of the second support frame. Both ends of the first support frame are slidably connected to the inner surface of the frame. A second loading cylinder is installed at the upper end of the first support frame. The telescoping end of the second loading cylinder is connected to the second support frame through a second sensor; the rotary swing cylinder is connected through a bearing to a tooling for clamping a tire.

[0006] Preferably, the tooling includes a clamping tooling and a rotary tooling. The upper end of the rotary tooling is connected to the bearing. The upper end of the clamping tooling extends into the lower end of the rotary tooling. One end of the clamping tooling in the X direction is hinged to the rotary tooling. The other end of the clamping tooling in the X direction is detachably connected to a third loading cylinder installed on the frame. A clamping cavity for clamping a tire is formed at the lower end of the clamping tooling.

[0007] Preferably, the first slide rail includes a first static end connected to the frame and a first moving end connected to the first support frame. The first moving end is slidably connected to the first static end.

[0008] Preferably, the second slide rail includes a second static end connected to the first support frame and a second moving end connected to the second support frame. The second moving end is slidably connected to the second static end.

[0009] The present invention also provides a method for testing using the above-mentioned tire deformation characteristic test device, including: clamping a tire on the tooling, and then performing the following tests respectively:

[0010] Testing the radial stiffness coefficient: Start the first loading cylinder to lift the first support frame, and at the same time lift the second support frame on the first support frame and the load-bearing platform to move upward until the load-bearing platform contacts the tire and causes the tire to deform. Read the radial load value and displacement value, and output the radial stiffness coefficient;

[0011] Testing the lateral stiffness coefficient: Start the rotary swing cylinder to drive the tooling and the tire thereon to rotate 90°, so that the axle of the tire is parallel to the X direction; Start the first loading cylinder to lift the first support frame, and at the same time lift the second support frame on the first support frame and the load-bearing platform to move upward until the load-bearing platform contacts the tire and causes the tire to deform; Start the second loading cylinder to telescope to drive the load-bearing platform to move along the lateral X direction. Read the lateral / course load value and displacement value, and output the lateral / course stiffness coefficient;

[0012] Testing the course stiffness coefficient: Start the rotary swing cylinder to drive the tooling and the tire thereon to rotate 90°, making the axle of the tire parallel to the Y direction; Start the first loading cylinder to lift the first support frame, and at the same time lift the second support frame on the first support frame and the load-bearing platform upward until the load-bearing platform contacts the tire and causes the tire to deform; Start the second loading cylinder to extend and retract, drive the load-bearing platform to move laterally along the X direction, read the lateral / course load value and displacement value, and output the lateral / course stiffness coefficient;

[0013] Testing the torsional stiffness coefficient: Start the first loading cylinder to lift the first support frame, and at the same time lift the second support frame on the first support frame and the load-bearing platform upward until the load-bearing platform contacts the tire and causes the tire to deform; Start the rotary swing cylinder, start the tooling and the tire to rotate, and the third sensor monitors the torque value, read the radial load value, torque value and radial displacement value, and output the torsional stiffness coefficient.

[0014] Preferably, the testing method further includes testing the tilting lateral cross-load stiffness coefficient: Start the telescopic rod of the third loading cylinder on the frame to extend, and connect the telescopic rod to the tooling; Continue to start the telescopic rod of the third loading cylinder to extend, making the tooling swing around the axis; When the target angle is reached, perform loading according to the method of testing the radial stiffness coefficient and the method of testing the lateral stiffness coefficient respectively, read the radial load value, torque value and radial displacement value respectively, and output the tilting lateral cross-load stiffness coefficient.

[0015] Compared with the related technology, the beneficial effects of the present invention are as follows:

[0016] First, the present invention optimizes the test parameters, formulates the lateral stiffness coefficient, torsional stiffness coefficient, course stiffness coefficient, radial stiffness coefficient and tilting lateral cross-load stiffness coefficient of the tire, etc., to more truly and effectively restore various working condition scenarios of the tire operation, and provides accurate data output for the shimmy performance of the nose landing gear;

[0017] Second, the present invention designs a mechanical device with correct principle, novel structure and proper layout, which plays a positive role in improving the accuracy and reliability of the tire characteristic test data;

[0018] Third, the device of the present invention can realize the composite loading of the same load, so as to calculate the corresponding coefficient, with simple structure and small error;

[0019] Fourth, it has strong versatility. By changing the loading tooling to ensure its adaptation to the tires of different specifications and different load nose landing gears, rapid replacement and application can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a certain type of nose landing gear;

[0021] Figure 2 Front view schematic diagram of the tire deformation characteristic test device provided by the present invention;

[0022] Figure 3 Side view schematic diagram of the tire deformation characteristic test device provided by the present invention;

[0023] Figure 4 Partial structural schematic diagram of lateral loading of the tire deformation characteristic test device provided by the present invention;

[0024] Figure 5 Schematic diagram of course loading of the tire deformation characteristic test device provided by the present invention;

[0025] Figure 6 Partial schematic diagram of torque stiffness of the tire deformation characteristic test device provided by the present invention;

[0026] Figure 7 Partial schematic diagram of tilting lateral cross load stiffness of the tire deformation characteristic test device provided by the present invention.

[0027] In the drawings: 1, first loading cylinder; 2, first support frame; 3, first sensor; 4, first slide rail; 41, first static end; 42, first moving end; 5, second loading cylinder; 6, second support frame; 7, second sensor; 8, third sensor; 9, load-bearing platform; 10, tire; 11, clamping tooling; 12, rotating tooling; 13, bearing; 14, rotating swing cylinder; 15, third loading cylinder; 16, frame; 17, second slide rail; 171, second static end; 172, second moving end; 18, first pin shaft; 19, second pin shaft; 20, main landing gear pivot shaft; 30, landing gear retraction actuator; 40, landing gear outer cylinder; 50, landing gear piston rod; 60, wheel axle. Specific embodiments

[0028] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. For the convenience of description, words such as "upper", "lower", "left", and "right" in the following text only represent the same directions as the upper, lower, left, and right directions of the drawings themselves, and do not limit the structure.

[0029] As Figure 2 、 Figure 3As shown in the figure, a tire deformation characteristic test device provided in this embodiment includes a first sensor 3, a first slide rail 4, a second loading cylinder 5, a second support frame 6, a second sensor 7, a third sensor 8, a load-bearing platform 9, a tooling, a bearing 13, a rotary swing cylinder 14, a third loading cylinder 15, a second slide rail 17, a first pin shaft 18, a second pin shaft 19, a frame 16, a first loading cylinder 1 disposed at the bottom of the frame 16 and telescoping radially, a rotary swing cylinder 14 disposed at the top of the frame 16 and capable of rotating along the top in the Z-axis direction, and a third loading cylinder 15 installed at the top of the frame 16 and capable of telescoping in the radial Z-axis direction.

[0030] In the figure, X is the lateral direction, Y is the course direction, and Z is the radial direction.

[0031] The first loading cylinder 1 is flange-connected to the lower end flange of the first sensor 3, and the upper end of the first sensor 3 is flange-connected to the first support frame 2. The first sensor 3 is a radial load sensor. As Figure 4 shown, the first slide rail 4 is provided on both sides of the frame 16 in the X direction. The first slide rail 4 includes a first static end 41 connected to the frame 16 and a first moving end 42 connected to the first support frame 2. The first moving end 42 is slidably connected to the first static end 41. When a radial load needs to be applied, the first loading cylinder 1 extends to lift the first support frame 2 upward.

[0032] The first support frame 2 is connected to a second support frame 6 through a second slide rail 17. The second slide rail 17 includes a second static end 171 connected to the first support frame 2 and a second moving end 172 connected to the second support frame 6. The second moving end 172 is slidably connected to the second static end 171. The second slide rail 17 extends along the lateral direction X. A third sensor 8 and a load-bearing platform 9 are sequentially arranged at the top of the second support frame 6. The third sensor 8 is a six-component force sensor. A second loading cylinder 5 is installed at the upper end of the first support frame 2, and the telescopic end of the second loading cylinder 5 is connected to the second support frame 6 through a second sensor 7. The rotary swing cylinder 14 is pin-connected to a bearing 13 (rotary bearing), and the bearing 13 is flange-connected to the clamping tooling 12. The first loading cylinder 1 and the second loading cylinder 5 are equipped with displacement sensors.

[0033] The tooling includes a clamping tooling 11 and a rotary tooling 12. The upper end of the rotary tooling 12 is flange-connected to the bearing 13. The upper end of the clamping tooling 11 extends into the lower end of the rotary tooling 12. One end of the clamping tooling 11 in the X direction is non-removably hinged to the rotary tooling 12 through a first pin shaft 18, and the other end of the clamping tooling 11 in the X direction is detachably connected to the third loading cylinder 15 through a second pin shaft 19. A clamping cavity for clamping the tire 10 is formed at the lower end of the clamping tooling 11. The clamping tooling 11 is clamped to the axle of the tire 10.

[0034] The present invention also provides a method for testing by using the above-mentioned tire deformation characteristic test device, including: clamping the tire 10 on the tooling, and then performing the following tests respectively:

[0035] Testing the radial stiffness coefficient: Start the first loading cylinder 1 to lift the first support frame 2, and at the same time lift the second support frame 6 and the load-bearing platform 9 on the first support frame 2 to move upward along the first slide rail 4 until the load-bearing platform 9 contacts the tire 10 and causes the tire 10 to deform. Read the radial load value and displacement value, draw the corresponding curve, and output the radial stiffness coefficient.

[0036] Testing the lateral stiffness coefficient: As Figure 4 shown, start the rotary swing cylinder 14 to drive the tooling and the tire 10 thereon to rotate 90°, so that the axle of the tire 10 is parallel to the X direction; start the first loading cylinder 1 to lift the first support frame 2, and at the same time lift the second support frame 6 and the load-bearing platform 9 on the first support frame 2 to move upward until the load-bearing platform 9 contacts the tire 10 and causes the tire 10 to deform; start the second loading cylinder 5 to retract, pull the second support frame 6 and the load-bearing platform 9 to move rightward along the lateral X direction, read the lateral / course load value and displacement value, draw the corresponding curve, and output the lateral / course stiffness coefficient.

[0037] Testing the course stiffness coefficient: As Figure 5 shown, start the rotary swing cylinder 14 to drive the tooling and the tire 10 thereon to rotate 90°, so that the axle of the tire 10 is parallel to the Y direction; start the first loading cylinder 1 to lift the first support frame 2, and at the same time lift the second support frame 6 and the load-bearing platform 9 on the first support frame 2 to move upward until the load-bearing platform 9 contacts the tire 10 and causes the tire 10 to deform; start the second loading cylinder 5 to retract, pull the second support frame 6 and the load-bearing platform 9 to move rightward along the lateral X direction, read the lateral / course load value and displacement value, draw the corresponding curve, and output the lateral / course stiffness coefficient.

[0038] Testing the torsional stiffness coefficient: As Figure 6 shown, start the first loading cylinder 1 to lift the first support frame 2, and at the same time lift the second support frame 6 and the load-bearing platform 9 on the first support frame 2 to move upward until the load-bearing platform 9 contacts the tire 10 and causes the tire 10 to deform; start the rotary swing cylinder 14, start the tooling and the tire 10 to rotate, the third sensor 8 monitors the torque value, read the radial load value, torque value and radial displacement value, draw the corresponding curve, and output the torsional stiffness coefficient;

[0039] Testing the cambered lateral cross load stiffness coefficient: As Figure 7As shown, extract the second pin shaft 19, start the third loading cylinder 15 on the starting frame 16 to extend the telescopic rod until the opening on the telescopic rod is aligned with the hole positions on the clamping tooling 11 and the rotating tooling 12, then insert the second pin shaft 19 to connect the telescopic rod and the tooling as a whole; continue to start the third loading cylinder 15 to extend the telescopic rod to make the tooling swing around the hinged first pin shaft 18; when the target angle is reached, load according to the method of testing the radial stiffness coefficient and the method of testing the lateral stiffness coefficient respectively. The third sensor 8 monitors the corresponding torque value in real time, reads the radial load value, torque value and radial displacement value respectively, draws the corresponding curves, and outputs the tilting lateral staggered load stiffness coefficient. Complete the corresponding test.

[0040] The present invention can conduct experimental tests on the lateral stiffness coefficient, torsional stiffness coefficient, course stiffness coefficient, radial stiffness coefficient, tilting lateral staggered load stiffness coefficient, etc. of tires, and by changing the loading tooling to ensure its adaptation to different models of tires, rapid replacement and application can be achieved, and the versatility is relatively strong.

[0041] Aiming at the technical difficulties in the test structure design of tire deformation characteristics, the present invention designs a mechanical device with correct principle, novel structure and appropriate layout, which plays an active role in improving the accuracy and reliability of tire characteristic test data.

[0042] The load application method of the present invention is simple and direct. Only the cooperation of three loading cylinders and a swinging loading cylinder is required to achieve the composite loading of different loads, so as to calculate the corresponding coefficients. The structure is simple and the error is small.

[0043] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A tire deformation characteristic test device, characterized in that It includes a frame (16), a first loading cylinder (1) provided at the bottom of the frame (16) and telescoping radially, and a rotary swing cylinder (14) provided at the top of the frame (16) and capable of rotating and swinging along the Z-axis top. A first sensor (3) is provided on the telescoping end of the first loading cylinder (1). A first support frame (2) is provided on the top of the first sensor (3). The first support frame (2) is connected to a second support frame (6) through a second slide rail (17). The second slide rail (17) extends along the lateral X. A third sensor (8) and a load-bearing platform (9) are sequentially provided on the top of the second support frame (6). The two ends of the first support frame (2) are slidably connected to the inner surface of the frame (16). A second loading cylinder (5) is installed at the upper end of the first support frame (2). The telescoping end of the second loading cylinder (5) is connected to the second support frame (6) through a second sensor (7). The rotary swing cylinder (14) is connected through a bearing (13) to a tooling for clamping a tire (10).

2. The tire deformation characteristic test device according to claim 1, characterized in that, The tooling includes a clamping tooling (11) and a rotary tooling (12). The upper end of the rotary tooling (12) is connected to the bearing (13). The upper end of the clamping tooling (11) extends into the lower end of the rotary tooling (12). One end of the clamping tooling (11) in the X direction is hinged to the rotary tooling (12). The other end of the clamping tooling (11) in the X direction is detachably connected to a third loading cylinder (15) installed on the frame (16). The lower end of the clamping tooling (11) forms a clamping cavity for clamping the tire (10).

3. The tire deformation characteristic test device according to claim 1, characterized in that, The first slide rail (4) includes a first static end (41) connected to the frame (16) and a first moving end (42) connected to the first support frame (2). The first moving end (42) is slidably connected to the first static end (41).

4. The tire deformation characteristic test device according to claim 1, wherein, The second slide rail (17) includes a second static end (171) connected to the first support frame (2) and a second moving end (172) connected to the second support frame (6). The second moving end (172) is slidably connected to the second static end (171).

5. A method of testing using the tire deformation characteristic test device described in any one of claims 1-4, characterized in that It includes: Clamp the tire (10) on the tooling and then conduct the following tests respectively: Test the radial stiffness coefficient: Start the first loading cylinder (1) to lift the first support frame (2), and at the same time lift the second support frame (6) on the first support frame (2) and the load-bearing platform (9) to move upward until the load-bearing platform (9) contacts the tire (10) and causes the tire (10) to deform. Read the radial load value and displacement value and output the radial stiffness coefficient; Test the lateral stiffness coefficient: Start the rotary swing cylinder (14) to drive the tooling and the tire (10) thereon to rotate so that the axle of the tire (10) is parallel to the X direction; Start the first loading cylinder (1) to lift the first support frame (2), and at the same time lift the second support frame (6) on the first support frame (2) and the load-bearing platform (9) to move upward until the load-bearing platform (9) contacts the tire (10) and causes the tire (10) to deform; Start the second loading cylinder (5) to extend and retract, drive the load-bearing platform (9) to move laterally along the X direction, read the lateral / course load value and displacement value, and output the lateral / course stiffness coefficient; Test the course stiffness coefficient: Start the rotary swing cylinder (14) to drive the tooling and the tire (10) thereon to rotate so that the axle of the tire (10) is parallel to the Y direction; Start the first loading cylinder (1) to lift the first support frame (2), and at the same time lift the second support frame (6) on the first support frame (2) and the load-bearing platform (9) to move upward until the load-bearing platform (9) contacts the tire (10) and causes the tire (10) to deform; Start the second loading cylinder (5) to extend and retract, drive the load-bearing platform (9) to move laterally along the X direction, read the lateral / course load value and displacement value, and output the lateral / course stiffness coefficient; Test the torsional stiffness coefficient: Start the first loading cylinder (1) to lift the first support frame (2), and at the same time lift the second support frame (6) on the first support frame (2) and the load-bearing platform (9) to move upward until the load-bearing platform (9) contacts the tire (10) and causes the tire (10) to deform; Start the rotary swing cylinder (14), start the tooling and the tire (10) to rotate, the third sensor (8) monitors the torque value, read the radial load value, torque value and radial displacement value, and output the torsional stiffness coefficient.

6. The method according to claim 5, wherein It also includes testing the tilting lateral cross-load stiffness coefficient: Start the telescopic rod of the third loading cylinder (15) on the frame (16) to extend, and connect the telescopic rod to the tooling; Continue to start the telescopic rod of the third loading cylinder (15) to extend, so that the tooling swings around the axis; When the target angle is reached, perform loading respectively according to the method of testing the radial stiffness coefficient and the method of testing the lateral stiffness coefficient, read the radial load value, torque value and radial displacement value respectively, and output the tilting lateral cross-load stiffness coefficient.

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