Abrasion wear test device and test method for aircraft tire

Abstract

The invention provides an aircraft tire abrasion test device and test method, and relates to the field of aircraft tire test equipment, and the aircraft tire abrasion test device comprises a dynamic simulation testing machine which comprises a flywheel and a loading frame used for installing and loading an aircraft tire; the friction simulation module comprises a plurality of arc-shaped grooves, each arc-shaped groove comprises an arc-shaped bottom wall matched with the surface of the flywheel and a mounting edge, the plurality of arc-shaped grooves are fixedly mounted on the outer surface of the flywheel through the mounting edges, and the friction coefficient of the outer surface of the friction simulation module is configured to simulate the friction coefficient of the ground of the target runway; and the rolling resistance applying device is mounted on the loading frame and is used for applying adjustable rolling resistance to the tire shaft of the aircraft tire. Simulation of the friction coefficient of a real runway is achieved, rolling resistance capable of being accurately regulated and controlled can be applied to the aircraft tire, and therefore the abrasion test condition closer to the actual service condition of the aircraft tire is constructed in the laboratory environment, and accurate detection and identification of abrasion of the aircraft tire are achieved.

Description

Technical Field

[0001] This invention relates to the field of aircraft tire testing equipment, specifically to an aircraft tire wear and abrasion testing device and method. Background Technology

[0002] Aircraft takeoff, landing, and taxiing all rely on the friction between the tires and the ground for operational activities. Statistics show that 80% of aircraft tire failures are caused by tread wear, making the study of aircraft tire tread wear characteristics crucial.

[0003] The national standard GB / T 9747-2008, "Test Methods for Aircraft Tires," specifies in section 14.2.4, "Tread Rubber Wear Test," that two rubber strips, 15mm-20mm wide and approximately 250mm long, should be cut longitudinally from the center of the tire crown (one strip for tires with an outer diameter of 400mm or less). Excess rubber should be removed from the cut strips, and the strips should be ground to a thickness of (3.2±0.3)mm. These strips should then be cut into specimens with a width of (12.7±0.2)mm and a length of (215.0±0.5)mm. The specimens should be attached to the tire wheel, with the outer arc surface used for grinding. The testing instruments, procedures, and methods for expressing the test results should follow the specifications in GB / T 1689. GB / T 1689 specifies the determination of the abrasion resistance of vulcanized rubber (using the Akron abrasion tester). This method is simple to operate, has good data repeatability, and fast feedback speed, and can be used for qualitative or quantitative comparison of the wear characteristics of automotive tread rubber. However, the test conditions differ greatly from the actual working conditions of aircraft tires, and it is difficult to establish equivalence between the rubber compound test data and the actual performance of aircraft tire treads. Therefore, the test methods specified in the existing national standards cannot truly and effectively reflect the wear and tear performance of aircraft tires. To accurately reflect the wear and tear performance of aircraft tires, it is necessary to conduct simulation tests on aircraft tires that closely resemble real aircraft tires, check the relevant performance of aircraft tires, and thus accurately reflect the wear and tear performance of aircraft tires.

[0004] Domestic research on the wear and tear of aircraft tires is limited. To simulate the real working conditions of aircraft tires, dynamic simulation testing machines are used to conduct wear and tear tests. Existing dynamic simulation testing machines for aircraft tires mainly consist of a flywheel and a loading frame, and can simulate real tire pressure, load, and contact speed. However, the steel flywheel in dynamic simulation tests cannot simulate the friction coefficient of real road surfaces, nor can it apply rolling resistance. Therefore, the wear and tear of aircraft tires on dynamic simulation testing machines does not match actual working conditions. Thus, simulating real aircraft tire working conditions helps researchers study the wear and tear mechanisms of aircraft tires, simulate various extreme working conditions in the laboratory, and provide strong technical support for the service life and operational range of aircraft. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide an aircraft tire wear and abrasion testing device and method. The present invention simulates the actual operating conditions of aircraft tires. On an aircraft tire dynamic simulation testing machine, through an improved testing device, the friction coefficient of a real aircraft runway is simulated, and a precisely controllable rolling resistance is applied to the aircraft tire. Thus, wear and abrasion test conditions that are closer to the actual service conditions of aircraft tires are constructed in a laboratory environment, so as to achieve accurate detection and identification of aircraft tire wear and abrasion.

[0006] This invention provides the following technical solution: an aircraft tire wear and abrasion testing device, comprising:

[0007] A dynamic simulation testing machine, comprising a flywheel and a loading frame for mounting and loading aircraft tires; A friction simulation module includes several arc-shaped grooves, each arc-shaped groove having an arc-shaped bottom wall adapted to the surface of the flywheel and mounting edges on opposite sides. The multiple arc-shaped grooves are detachably fixed to the outer surface of the flywheel via the mounting edges to form the friction simulation module on the outer surface of the flywheel. The friction coefficient of the outer surface of the friction simulation module is configured to simulate the friction coefficient of the target aircraft runway surface. A rolling resistance applying device, mounted on the loading frame, is used to apply adjustable rolling resistance to the tire axle of the aircraft tire; the rolling resistance applying device includes: A connecting clamp is fixedly connected to the hub of the aircraft tire, and the aircraft tire is mounted on the loading frame; A support assembly, the bottom of which is fixed to the loading frame, and the support portion of which is rotatably connected to the connecting clamp to rotatably support the connecting clamp on the loading frame; A resistance application unit, which is connected to the connecting clamp via a transmission component, is used to generate controllable resistance to the aircraft tire and measure the applied resistance torque.

[0008] According to one embodiment of this application, the friction simulation module is a steel arc-shaped groove, and multiple bolt mounting holes are provided on the mounting edge of the arc-shaped groove so as to cover and fix the arc-shaped groove to the outer surface of the flywheel by means of bolt connection.

[0009] According to one embodiment of this application, the support assembly includes a support bearing housing and a clamp bearing disposed between the connecting clamp and the support bearing housing.

[0010] According to one embodiment of this application, a tire axle bearing is provided between the connecting clamp and the tire axle.

[0011] According to one embodiment of this application, the resistance application unit includes a brake and a torque meter, wherein the brake is an eddy current brake.

[0012] According to one embodiment of this application, the resistance application unit further includes a coupling and a diaphragm coupling connected in sequence. The coupling is connected to the connecting clamp by screws, the coupling is connected to the torque meter by a flat key, and the torque meter is connected to the eddy current brake through the diaphragm coupling.

[0013] This application also provides a method for testing the wear and tear of aircraft tires, using the aircraft tire wear and tear testing apparatus as described above, including the following steps: S1. Install a friction simulation module with a target friction coefficient on the flywheel of the dynamic simulation test machine; install the aircraft tire to be tested and the rolling resistance application device on the loading frame of the dynamic simulation test machine; S2. Set the test parameters, including the coefficient of friction, target rolling resistance, tire load, flywheel speed, and test time; S3. Start the flywheel to the set speed and load the aircraft tire to the set load; S4. Control the rolling resistance applying device to apply a set amount of rolling resistance to the tire axle of the aircraft tire; S5. Run the test under the set comprehensive operating conditions; S6. Evaluate tire wear and tear after the test.

[0014] According to one embodiment of this application, in step S4, the actual resistance torque is measured by a torque meter, and the operating parameters of the control brake are fed back to achieve closed-loop control and precise adjustment of rolling resistance.

[0015] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least: (1) The test device of the present invention simulates the friction coefficient of a real aircraft runway on a dynamic simulation test machine through a replaceable friction simulation module with a specific surface treatment; at the same time, through the rolling resistance application device, it can apply precisely adjustable rolling resistance, which greatly improves the consistency between the laboratory simulation conditions and the actual take-off, landing and taxiing conditions.

[0016] (2) Because the test conditions are closer to reality, the tire wear data obtained from the test are more accurate and reliable in reflecting the actual service performance of the tire, providing a more reliable technical basis for the design improvement and life prediction of aircraft tires.

[0017] (3) The rolling resistance application device of this embodiment integrates the functions of resistance application and shaft auxiliary support, and has a compact structure. By adopting the control method of electric eddy current brake combined with torque meter feedback, the rolling resistance can be adjusted steplessly, smoothly and accurately, and the sliding resistance spectrum under different runway conditions and different speeds can be easily simulated. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the aircraft tire wear and abrasion testing device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the friction simulation module according to an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the assembly effect of the friction simulation module and flywheel in an embodiment of the present invention; Figure 4 This is a schematic diagram of the aircraft tire wear and abrasion testing device from another perspective according to an embodiment of the present invention; Among them, 1-connecting fixture, 2-support bearing seat, 3-fixture bearing, 4-tire shaft bearing, 5-coupling, 6-torque meter, 7-diaphragm coupling, 8-electric eddy current brake, 9-friction simulation module, 10-flywheel, 11-aircraft tire. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] This invention provides an aircraft tire wear and abrasion testing device, comprising: A dynamic simulation testing machine, comprising a flywheel and a loading frame for mounting and loading aircraft tires; A friction simulation module includes several arc-shaped grooves, each arc-shaped groove having an arc-shaped bottom wall adapted to the surface of the flywheel and mounting edges on opposite sides. The multiple arc-shaped grooves are detachably fixed to the outer surface of the flywheel via the mounting edges to form the friction simulation module on the outer surface of the flywheel. The friction coefficient of the outer surface of the friction simulation module is configured to simulate the friction coefficient of the target aircraft runway surface. A rolling resistance applying device, mounted on the loading frame, is used to apply adjustable rolling resistance to the tire axle of the aircraft tire; the rolling resistance applying device includes: A connecting clamp is fixedly connected to the hub of the aircraft tire, and the aircraft tire is mounted on the loading frame; A support assembly, the bottom of which is fixed to the loading frame, and the support portion of which is rotatably connected to the connecting clamp to rotatably support the connecting clamp on the loading frame; A resistance application unit, which is connected to the connecting clamp via a transmission component, is used to generate controllable resistance to the aircraft tire and measure the applied resistance torque.

[0023] The aircraft tire wear and abrasion testing device of this invention mainly consists of two parts: a friction simulation module and a rolling resistance application device. The friction simulation module is used to simulate the friction coefficient of the aircraft runway surface, and the rolling resistance application device applies rolling resistance to the aircraft tire.

[0024] In some embodiments of the present invention, the support assembly includes a support bearing housing and a clamp bearing disposed between the connecting clamp and the support bearing housing. A tire axle bearing is disposed between the connecting clamp and the tire axle.

[0025] In some embodiments of the present invention, the resistance application unit includes a brake and a torque meter, wherein the brake is an eddy current brake. The resistance application unit further includes a coupling and a diaphragm coupling connected in sequence. The coupling is connected to the connecting clamp by screws, and the coupling is connected to the torque meter by a flat key. The torque meter is connected to the eddy current brake via the diaphragm coupling.

[0026] In specific implementation, such as Figure 1As shown, the rolling resistance applying device is used to apply rolling resistance. The auxiliary support arm of the loading frame is disassembled, and the rolling resistance device is installed. This device, in addition to applying resistance to the aircraft tire, also provides auxiliary support for the tire axle. The rolling resistance applying device consists of a connecting clamp 1, a support bearing seat 2, a clamp bearing 3, a tire axle bearing 4, a coupling 5, a torque meter 6, a diaphragm coupling 7, and an eddy current brake 8. The connecting clamp 1 is connected to the tire hub with screws. The tire axle bearing 4 is installed between the tire axle and the connecting clamp 1. The clamp bearing 3 is installed between the connecting clamp 1 and the support bearing seat 2. The support bearing seat 2 is installed on the loading frame of the dynamic simulation testing machine, thus achieving the functions of rotational isolation and auxiliary support for the tire axle. The coupling 5 is connected to the connecting clamp 1 with screws and to the torque meter 6 with a flat key. The torque meter 6 is connected to the eddy current brake 8 via the diaphragm coupling 7.

[0027] The rolling resistance application device of this invention applies rolling resistance through the tire hub, avoiding direct contact with the tire tread and making the simulation effect more realistic. The eddy current brake can effectively adjust the rolling resistance by controlling the current, making the rolling resistance adjustable.

[0028] In some embodiments of the present invention, the friction simulation module is a steel arc-shaped groove, and multiple bolt mounting holes are provided on the mounting edge of the arc-shaped groove so as to cover and fix the arc-shaped groove to the outer surface of the flywheel by means of bolt connection.

[0029] like Figure 2 As shown, in specific implementation, the friction simulation module 9 is a steel arc-shaped module. The steel arc-shaped module is connected to the flywheel 10 of the dynamic simulation testing machine by bolts, completely covering the outer arc-shaped surface of the flywheel 10. The assembly effect is as follows: Figure 3 As shown, the outer surface of the steel arc-shaped module undergoes relevant processing technology to make its friction coefficient the same as that of the actual aircraft tire landing surface, thus simulating the surface friction coefficient. To simulate different surface friction coefficients, the entire steel arc-shaped module can be replaced. This invention designs a steel friction simulation module 9 installed on the outer surface of the flywheel 10 to simulate the surface friction coefficient. Rolling resistance is applied to the aircraft tire 11 through a rolling resistance application device, such as... Figure 4 As shown.

[0030] The connection relationship and working principle of this device are as follows: the connecting clamp 1 rotates together with the aircraft tire hub, and the torque is transmitted to the eddy current brake 8 through the coupling 5, torque meter 6, and diaphragm coupling 7. The eddy current brake 8 dissipates kinetic energy by generating eddy current resistance, thereby applying a resistance torque to the tire axle. By adjusting the excitation current of the eddy current brake 8, its braking torque can be changed linearly. The torque meter 6 measures the actual applied torque value in real time and feeds the signal back to the control system. The control system compares the actual torque with the target torque and dynamically adjusts the current of the eddy current brake 8 to form a closed-loop control, thereby achieving precise and stable application of rolling resistance. At the same time, the support system composed of the support bearing seat 2, the clamp bearing 3, and the tire axle bearing 4 ensures the rotational stability and structural rigidity of the tire axle when subjected to additional resistance.

[0031] This application also provides a method for testing the wear and tear of aircraft tires, using the aircraft tire wear and tear testing apparatus as described above, including the following steps: S1. Install a friction simulation module with a target friction coefficient on the flywheel of the dynamic simulation test machine; install the aircraft tire to be tested and the rolling resistance application device on the loading frame of the dynamic simulation test machine; S2. Set the test parameters, including the coefficient of friction, target rolling resistance, tire load, flywheel speed, and test time; S3. Start the flywheel to the set speed and load the aircraft tire to the set load; S4. Control the rolling resistance applying device to apply a set amount of rolling resistance to the tire axle of the aircraft tire; S5. Run the test under the set comprehensive operating conditions; S6. Evaluate tire wear and tear after the test.

[0032] In some embodiments of the present invention, in step S4, the actual resistance torque is measured by a torque meter and the operating parameters of the control brake are fed back to achieve closed-loop control and precise adjustment of rolling resistance.

[0033] In specific implementation, the tire wear test process of this embodiment of the invention is as follows: 1) A steel arc-shaped module is installed on the flywheel of the dynamic simulation test machine, and the friction coefficient of the module surface matches the test requirements; 2) The tire axle and aircraft tire are installed, and the aircraft tire simulates the actual tire pressure and is corrected; 3) The connecting fixture 1 is installed; 4) The tire axle bearing 4 is installed; 5) The fixture bearing 3 is installed; 6) The support bearing seat 2 is installed; 7) The coupling 5 is installed; 8) The torque meter 6 is installed; 9) The diaphragm coupling 7 is installed; 10) The eddy current brake 8 is installed; 11) The test bench is started to rotate the flywheel to the specified speed; 12) The loading frame loads the aircraft tire onto the flywheel to simulate the tire running load; 13) The eddy current brake 8 is activated, and the magnitude of the rolling resistance is controlled by the torque meter 6 in a closed loop; 14) The test is completed according to the given rolling speed, time, load, friction coefficient, and rolling resistance spectrum. Finally, after the set test time is reached, the rolling resistance is unloaded, the vertical load on the tire is unloaded, and the flywheel 10 is stopped in sequence. Remove the aircraft tire 11 and conduct morphological observation, wear measurement, and tread block height change measurement on the tread surface to quantitatively evaluate its wear performance.

[0034] The present invention uses an improved testing device on an aircraft tire dynamic simulation testing machine to simulate the friction coefficient of a real aircraft runway and apply precisely controllable rolling resistance to the aircraft tire, thereby constructing wear and tear test conditions in a laboratory environment that are closer to the actual service conditions of aircraft tires (especially the takeoff, landing, and taxiing phases).

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An aircraft tire wear and abrasion testing device, characterized in that, include: A dynamic simulation testing machine, comprising a flywheel and a loading frame for mounting and loading aircraft tires; A friction simulation module includes several arc-shaped grooves, each arc-shaped groove having an arc-shaped bottom wall adapted to the surface of the flywheel and mounting edges on opposite sides. The multiple arc-shaped grooves are detachably fixed to the outer surface of the flywheel via the mounting edges to form the friction simulation module on the outer surface of the flywheel. The friction coefficient of the outer surface of the friction simulation module is configured to simulate the friction coefficient of the target aircraft runway surface. A rolling resistance application device, which is mounted on the loading frame, is used to apply adjustable rolling resistance to the tire axle of the aircraft tire. The rolling resistance applying device includes: A connecting clamp is fixedly connected to the hub of the aircraft tire, and the aircraft tire is mounted on the loading frame; A support assembly, the bottom of which is fixed to the loading frame, and the support portion of which is rotatably connected to the connecting clamp to rotatably support the connecting clamp on the loading frame; A resistance application unit, which is connected to the connecting clamp via a transmission component, is used to generate controllable resistance to the aircraft tire and measure the applied resistance torque.

2. The aircraft tire wear and abrasion testing device according to claim 1, characterized in that, The friction simulation module is a steel arc-shaped groove. Multiple bolt mounting holes are provided on the mounting edge of the arc-shaped groove so that the arc-shaped groove can be covered and fixed to the outer surface of the flywheel by bolt connection.

3. The aircraft tire wear and abrasion testing device according to claim 1, characterized in that, The support assembly includes a support bearing housing and a clamp bearing disposed between the connecting clamp and the support bearing housing.

4. The aircraft tire wear and abrasion testing device according to claim 1, characterized in that, A tire axle bearing is provided between the connecting clamp and the tire axle.

5. The aircraft tire wear and abrasion testing device according to claim 1, characterized in that, The resistance application unit includes a brake and a torque meter, wherein the brake is an eddy current brake.

6. The aircraft tire wear and abrasion testing apparatus according to claim 5, characterized in that, The resistance application unit further includes a coupling and a diaphragm coupling connected in sequence. The coupling is connected to the connecting clamp by screws, and the coupling is connected to the torque meter by a flat key. The torque meter is connected to the eddy current brake through the diaphragm coupling.

7. A method for testing the wear and tear of aircraft tires, using the aircraft tire wear and tear testing apparatus as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Install a friction simulation module with a target friction coefficient on the flywheel of the dynamic simulation test machine; install the aircraft tire to be tested and the rolling resistance application device on the loading frame of the dynamic simulation test machine; S2. Set the test parameters, including the coefficient of friction, target rolling resistance, tire load, flywheel speed, and test time; S3. Start the flywheel to the set speed and load the aircraft tire to the set load; S4. Control the rolling resistance applying device to apply a set amount of rolling resistance to the tire axle of the aircraft tire; S5. Run the test under the set comprehensive operating conditions; S6. Evaluate tire wear and tear after the test.

8. The method for testing the wear and tear of aircraft tires according to claim 7, characterized in that, In step S4, the actual resistance torque is measured by a torque meter, and the operating parameters of the control brake are fed back to achieve closed-loop control and precise adjustment of rolling resistance.

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