Undercarriage buffer performance test environment simulation device

Abstract

The utility model relates to the technical field of aircraft test, and discloses an undercarriage buffer performance test environment simulation device, which comprises a lifting device and an environment simulation device, and is characterized in that the lifting device comprises a hanging basket, the hanging basket is fixedly connected with an undercarriage, and the hanging basket is used for adjusting the initial height of the undercarriage; the environment simulation device comprises a first box body, a second box body and an environment temperature control device, one end of the first box body is fixedly connected with the hanging basket, one end of the second box body is connected with a displacement device, and the displacement device is used for enabling the second box body to abut against the first box body for sealing; a closed cavity for accommodating the undercarriage is formed after the first box body and the second box body are propped against each other; the environment temperature control device is connected with the second box body so as to control the environment temperature in the closed cavity; according to the utility model, the simulation environment can be more suitable for the use environment of the undercarriage, and the temperature control of the undercarriage in the test is more accurate and uniform; and the first box body and the second box body are designed in a split manner, so that the test process is simpler and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft testing, in particular to an environmental simulation device for testing the buffer performance of landing gear. Background Art

[0002] With the improvement of aircraft design technology, modern aircraft can fly in different airspaces, take off and land in complex environments in different time domains and regions. In particular, the flight environment of modern high-performance aerospace aircraft is more complex, which causes the landing gear system to be seriously affected by temperature differences and changes when landing at different ambient temperatures. This directly affects the safety of the aircraft. Therefore, it is necessary to test the ability of the landing gear within the temperature range involved in the aircraft landing gear drop shock test so that the aircraft landing gear can meet the needs of more variable environmental use.

[0003] However, in the existing technology, the structure for temperature control of aircraft landing gear is relatively complex, and it is troublesome to close and open it, which is not convenient for subsequent testing work, and the temperature control effect is poor, making the experimental results inaccurate. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to optimize the structure to make the test more convenient and the temperature control more accurate. In order to solve the above technical problems, the utility model provides an environmental simulation device for landing gear buffer performance test, including a test bench and a lifting device and an environmental simulation device arranged on the test bench;

[0005] The lifting device comprises a hanging basket, a landing gear for testing is fixedly connected to the bottom of the hanging basket, and the hanging basket is used to adjust the initial height of the landing gear;

[0006] The environmental simulation device comprises a first box, a second box and an environmental temperature control device, wherein one end of the first box away from the second box is fixedly connected to the hanging basket, and one end of the second box away from the first box is connected to a displacement device arranged on the test bench, wherein the displacement device is used to adjust the position of the second box so that the second box abuts against the first box and seals; after the first box abuts against the second box, a closed cavity for accommodating the landing gear is formed;

[0007] The ambient temperature control device is fixed to the displacement device, and the ambient temperature control device is connected to the second box to control the ambient temperature in the closed cavity.

[0008] Preferably, the ambient temperature control device is connected to a first tube body and a second tube body, the other ends of the first tube body and the second tube body are connected to the second box body, and the first tube body and the second tube body are respectively used to introduce hot air or cold air into the second box body to regulate the temperature inside the second box body.

[0009] Preferably, the test bench is fixedly provided with a movable guide rail, and the movable guide rail is slidably connected to the displacement device.

[0010] Preferably, the displacement device includes a retaining frame and a lifting drive device, the retaining frame is slidably connected to the second box body in a vertical direction; the lifting drive device is hinged to the second box body to drive the second box body to approach and abut against the first box body.

[0011] Preferably, the inner side walls of the second box body and the first box body are provided with a heat insulation layer, and the inner side wall of the second box body is also provided with a temperature sensor.

[0012] Preferably, the displacement device is further provided with an electric control cabinet, and the electric control cabinet is electrically connected to the ambient temperature control device.

[0013] Preferably, a plurality of counterweight blocks are detachably provided in the hanging basket, and the counterweight blocks are used to adjust the potential energy of the landing gear during falling impact.

[0014] Preferably, it further comprises a wheel-belt rotating mechanism, which is fixed to the test bench and is used to drive the tire at the bottom of the landing gear to rotate.

[0015] Preferably, it also includes a force measuring platform, which is arranged on the test bench and is used to measure the impact data when the landing gear falls.

[0016] Compared with the prior art, the environmental simulation device for landing gear buffer performance test provided in the embodiment of the utility model has the following beneficial effects:

[0017] In the utility model, the environmental simulation device includes a split first box and a second box. The first box and the second box can form a closed cavity when they are abutted. The landing gear to be tested is also completely placed in the closed cavity. The ambient temperature in the closed cavity is adjusted by the environmental temperature control device, so that the entire landing gear is in a relatively uniform high temperature or low temperature environment, rather than local temperature control. It is more in line with the ambient temperature when the landing gear is in use, and can better simulate and detect more critical positions such as the landing gear buffer device and hinge points under special temperature conditions, so that the temperature control of the landing gear in the drop shock test is more accurate and uniform. Moreover, since the first box and the second box are split designs, the abutment, sealing or separation of the second box and the first box can be quickly controlled by controlling the displacement device, thereby facilitating the subsequent ambient temperature adjustment process and the test process, which makes the entire test process simpler and more reliable, and the test efficiency is higher and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional view of the utility model;

[0019] Figure 2 It is a front view of the utility model;

[0020] Figure 3 It is a top view of the utility model;

[0021] Figure 4 It is a three-dimensional view of the environment simulation device of the utility model;

[0022] Figure 5 The utility model Figure 4 sectional view of .

[0023] In the figure: 1. Test bench; 11. Moving guide rail;

[0024] 2. Lifting device; 21. Hanging basket; 22. Counterweight;

[0025] 3. Environmental simulation device; 31. First box; 32. Second box; 321. Temperature sensor; 33. Environmental temperature control device; 331. First tube; 332. Second tube; 34. Displacement device; 341. Cage; 342. Lifting drive device; 35. Closed cavity; 36. Electric control cabinet;

[0026] 4. Landing gear; 5. Wheel rotation mechanism; 6. Force measuring platform. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] like Figure 1 and Figure 4 and Figure 5 As shown, the preferred embodiment of the utility model provides an environmental simulation device for landing gear buffer performance test, which includes a test bench 1 and a lifting device 2 and an environmental simulation device 3 arranged on the test bench 1;

[0029] The lifting device 2 includes a hanging basket 21, and a landing gear 4 for testing is fixedly connected to the bottom of the hanging basket 21. The hanging basket 21 is used to adjust the initial height of the landing gear 4 when it falls.

[0030] The environment simulation device 3 includes a first box 31, a second box 32 and an environment temperature control device 33. One end of the first box 31 away from the second box 32 is fixedly connected to the hanging basket 21. One end of the second box 32 away from the first box 31 is connected to a displacement device 34 arranged on the test bench 1. The displacement device 34 is used to adjust the position of the second box 32 so that the second box 32 and the first box 31 are abutted and sealed. After the first box 31 and the second box 32 are abutted, a closed cavity 35 for accommodating the landing gear 4 is formed;

[0031] The ambient temperature control device 33 is fixed to the displacement device 34 , and is connected to the second box 32 to control the ambient temperature in the closed cavity 35 .

[0032] Specifically, when performing a drop shock test on the landing gear 4, the landing gear 4 to be tested is first fixed to the bottom of the basket 21, and then the displacement device 34 is controlled to move on the test bench 1 so that the position of the second box 32 corresponds to the position of the first box 31, and then the second box 32 is abutted and sealed with the first box 31, so that the landing gear 4 to be tested is completely sealed in the closed cavity, wherein the displacement device 34 can be driven to move by a motor in conjunction with a guide rail or a slide groove and other structures, preferably a computer-controlled motor is used to drive the displacement device 34 to move, which has a better degree of automation, higher test efficiency, and is more accurate and stable, and the abutment seal between the second box 32 and the first box 31 can be provided with a sealing ring and other sealing structures at the connection to further improve the thermal insulation effect of the closed cavity 35. When the second box body 32 is completely abutted and sealed against the first box body 31, the ambient temperature control device 33 will control the temperature in the closed cavity 35 so that the temperature in the closed cavity 35 is at the low temperature or high temperature requirement required for the test and lasts for a period of time, fully simulating the low temperature or high temperature environment that the landing gear 4 may encounter during the flight of the aircraft. Moreover, since it is a closed cavity 35, the entire landing gear 4 is placed in the closed cavity 35, which makes the landing gear 4 as a whole at the test temperature, and the temperature difference between the various parts of the landing gear 4 is smaller. The temperature control during the test is more precise, and closer to the environment encountered by the actual aircraft landing gear 4. In particular, it can simulate the performance of key positions such as the buffer device and hinge points of the landing gear 4 in an icing state, and the test effect is naturally better. When the temperature control duration in the closed cavity 35 reaches a predetermined time, the displacement device 34 can quickly remove the second box body 32 to expose the landing gear 4 to be tested, and then the basket 21 in the lifting device 2 will drive the landing gear 4 to a predetermined height for release under the action of the hoist (not shown in the figure), thereby completing a landing gear 4 buffer performance test with environmental simulation. The setting of the displacement device 34 makes the abutment and sealing process between the second box body 32 and the first box body 31 and the subsequent removal process more convenient and quick, thereby making the entire test process simpler, more convenient, more efficient, and the test environment more stable and reliable.

[0033] like Figure 2 and Figure 3 As shown, in some embodiments, the ambient temperature control device 33 is connected to a first tube body 331 and a second tube body 332, the other ends of the first tube body 331 and the second tube body 332 are connected to the second box body 32, and the first tube body 331 and the second tube body 332 are respectively used to introduce hot air or cold air into the second box body 32 to regulate the temperature inside the second box body 32.

[0034] Specifically, the ambient temperature control device 33 includes a fan, a heating component and a refrigeration component. After the second box 32 and the first box 31 are sealed to form a closed cavity 35, the heating component or the refrigeration component will start to reduce the temperature of the air, and the fan will blow the heated or cooled gas into the closed cavity 35 through the first pipe or the second pipe to reduce the temperature in the closed cavity 35 until the landing gear 4 is at a preset test temperature. Further, the heating component can be heated by a high-power electric heating wire, and the refrigeration component can be cooled by a heat exchanger, or by liquid nitrogen or dry ice, or by directly filling the closed cavity 35 with liquid nitrogen or dry ice. It can be understood that an air circulation pipeline will be provided between the second box 32 and the ambient temperature control device 33, so that when the closed cavity 35 is heated or cooled, the internal pressure of the closed cavity 35 can be avoided to be too high; and the outer walls of the first pipeline and the second pipeline are provided with a heat preservation device, so as to avoid excessive heat exchange between the first pipeline and the first pipeline and the outside. Furthermore, the environmental temperature control device can control the temperature in the closed cavity 35 to range from -55°C to 120°C.

[0035] like Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the test bench 1 is fixedly provided with a movable guide rail 11, and the movable guide rail 11 is slidably connected with a displacement device 34.

[0036] Specifically, the setting direction of the movable guide rail 11 on the test bench 1 is not limited, so long as the second box body 32 on the displacement device 34 can be moved to the bottom of the first box body 31. The movement of the displacement device 34 along the movable guide rail 11 is controlled by a computer to drive the motor to move the displacement device 34, thereby accurately controlling the movement amount of the displacement device 34, so that the second box body 32 can be more accurately aligned with the first box body 31, thereby facilitating the subsequent abutment sealing process, and making the sealing more accurate and reliable, the sealing stronger, and the degree of automation higher, while the work efficiency and stability are also improved.

[0037] like Figure 2 , Figure 4 and Figure 5As shown, in some embodiments, the displacement device 34 includes a holder 341 and a lifting drive device 342. The holder 341 is slidably connected to the second box 32 in the vertical direction; the lifting drive device 342 is hinged with the second box 32 to drive the second box 32 to approach and abut against the first box 31. Specifically, the holder 341 is generally a frame structure composed of steel pipes. Under normal conditions, the second box 32 is stored in the holder 341. When the displacement device 34 moves the second box 32 to the bottom of the first box 31 along the moving guide rail 11, the lifting drive device 342 drives the second box 32 to move upward in the vertical direction and slide out of the holder 341. The upper end opening of the second box 32 gradually approaches the lower end opening of the first box 31. Finally, the second box 32 abuts against the first box 31 to form a closed cavity 35 and the landing gear 4 to be tested is completely in the closed cavity 35, making the subsequent environmental temperature control more convenient. Furthermore, a guide groove is provided on the inner side of the retaining frame 341, and the second box body 32 is provided with a guide wheel or a guide bar or other structures corresponding to the guide groove to facilitate the sliding of the second box body 32 in the retaining frame 341 along the vertical direction, and the lifting drive device 342 can use a drive structure such as a cylinder or a hydraulic cylinder or a servo electric cylinder, whose base is fixed on the retaining frame 341 or the positioning device, and the upper end is connected to the second box body 32.

[0038] In some embodiments, the inner side walls of the second box 32 and the first box 31 are provided with a heat insulation layer, and the inner side wall of the second box 32 is also provided with a temperature sensor 321. Specifically, the heat insulation layer can be provided on the inner side walls of the first box 31 and the second box 32, or can be provided in the interlayer of the inner side wall, and the heat insulation layer is not shown in the figure. The heat insulation layer can prevent the temperature in the closed cavity 35 from excessively exchanging heat with the outside through the first box 31 or the second box 32, so that the temperature in the closed cavity 35 can be kept stable, and when the temperature is lowered or raised to the preset test temperature, the temperature can be made more stable and the energy consumption is also lower. The temperature sensor 321 is used to monitor the temperature in the closed cavity 35 in real time, so that the temperature in the closed cavity 35 can be stably maintained at the preset test temperature.

[0039] like Figure 3 and Figure 4As shown, in some embodiments, the displacement device 34 is further provided with an electric control cabinet 36, which is electrically connected to the ambient temperature control device 33, and can be used to adjust the working state of the ambient temperature control device 33. The electric control cabinet 36 is electrically connected to the temperature sensor 321, and can obtain the temperature in the closed cavity 35 in real time. When the temperature in the closed cavity 35 reaches a preset temperature, the electric control cabinet 36 controls the ambient temperature device to continue to work for a preset time, so that the temperature in the closed cavity 35 is maintained for a preset time, so that the landing gear 4 to be tested can be fully in a low temperature or high temperature environment, thereby making the state of the landing gear 4 in the simulated environment better and closer to the state of the landing gear 4 during the actual flight of the aircraft. Of course, in the actual use process, the control modules of other mechanisms in the simulation device can also be integrated in the electrical control cabinet, such as the intermediate drive device of the wheel belt rotation mechanism and the tire speed detection device to control the operation status of the wheel belt rotation mechanism, or the lifting device hoist and height detection device, etc., so as to accurately control the lifting height of the hanging basket. The electrical control components of the device mechanisms in the simulation device can be integrated in the electrical control cabinet, so as to realize the monitoring and control of the working status of the entire simulation device.

[0040] like Figure 1 As shown, in some embodiments, a plurality of counterweights 22 are detachably provided in the hanging basket 21, and the counterweights 22 are used to adjust the potential energy of the landing gear 4 during the falling impact. Different aircrafts have different weights and take-off and landing speeds, so the landing gear 4 actually faces different impact potential energies during landing. By adjusting the counterweights 22, the weight of the hanging basket 21 is adjusted, thereby adjusting the impact force suffered by the landing gear 4 during the landing of the aircraft, thereby meeting different drop shock test requirements.

[0041] In some embodiments, a wheel belt rotation mechanism 5 is further included, which is fixed to the test bench 1 and is used to drive the tire at the bottom of the landing gear 4 to rotate. The wheel belt rotation mechanism 5 is connected to the tire under the landing gear 4 (the specific connection structure is not shown in the figure), and the wheel belt rotation mechanism 5 is used to drive the tire to rotate, thereby simulating the tire rotation state when the aircraft lands, that is, after landing, so that the simulation environment is closer to the real landing environment.

[0042] like Figure 2 , Figure 4 and Figure 5As shown, in some embodiments, a force measuring platform 6 is also included, and the force measuring platform 6 is arranged on the test bench 1. The force measuring platform 6 is used to measure the impact data when the landing gear 4 falls. The force measuring platform 6 is fixed on the test bench 1 and is located directly below the landing gear 4 to be tested. After the landing gear 4 undergoes ambient temperature simulation, the displacement device 34 drives the second box 32 to leave the first box 31, and the hoist in the lifting device 2 drives the hanging basket 21 and the landing gear 4 to rise to a preset height for release. Then the landing gear 4 will fall on the force measuring platform 6, and the force measuring platform 6 can test the instantaneous impact force when the landing gear 4 falls, providing data support for subsequent analysis.

[0043] In summary, the embodiment of the utility model provides an environmental simulation device 3 for testing the cushioning performance of a landing gear 4. When performing a drop shock test on the landing gear 4, the landing gear 4 to be tested is first fixed to the bottom of the hanging basket 21, and then the displacement device 34 is controlled to move on the test bench 1, so that the position of the second box 32 corresponds to the position of the first box 31, and then the second box 32 is abutted and sealed with the first box 31, so that the landing gear 4 to be tested is completely sealed in the closed cavity. When the second box 32 is completely abutted and sealed with the first box 31, the environmental temperature control device 33 controls the temperature in the closed cavity 35, so that the temperature in the closed cavity 35 is at the test temperature. The required low or high temperature is required to last for a period of time, which fully simulates the low or high temperature environment that the landing gear 4 may encounter during the flight of the aircraft. When the temperature control duration in the closed cavity 35 reaches the predetermined time, the displacement device 34 can quickly remove the second box 32 to expose the landing gear 4 to be tested, and then the basket 21 drives the landing gear 4 to a predetermined height for release, thereby completing a landing gear 4 buffer performance test with environmental simulation. The setting of the displacement device 34 makes the abutment and sealing process between the second box 32 and the first box 31 and the subsequent removal process more convenient and quick, thereby making the entire test process simpler and more convenient.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An environmental simulation device for landing gear cushioning performance test, comprising a test bench and a lifting device and an environmental simulation device arranged on the test bench, characterized in that: The lifting device comprises a hanging basket, a landing gear for testing is fixedly connected to the bottom of the hanging basket, and the hanging basket is used to adjust the initial height of the landing gear; The environmental simulation device comprises a first box, a second box and an environmental temperature control device, wherein one end of the first box away from the second box is fixedly connected to the hanging basket, and one end of the second box away from the first box is connected to a displacement device arranged on the test bench, wherein the displacement device is used to adjust the position of the second box so that the second box abuts against the first box and seals; after the first box abuts against the second box, a closed cavity for accommodating the landing gear is formed; The ambient temperature control device is fixed to the displacement device, and the ambient temperature control device is connected to the second box to control the ambient temperature in the closed cavity.

2. The environmental simulation device for landing gear cushioning performance test according to claim 1, characterized in that: The ambient temperature control device is connected to a first tube body and a second tube body, the other ends of the first tube body and the second tube body are connected to the second box body, and the first tube body and the second tube body are respectively used to introduce hot air or cold air into the second box body to adjust the temperature inside the second box body.

3. The environmental simulation device for landing gear cushioning performance test according to claim 1, characterized in that: The test bench is fixedly provided with a movable guide rail, and the movable guide rail is slidably connected with the displacement device.

4. The environmental simulation device for landing gear cushioning performance test according to claim 3, characterized in that: The displacement device includes a retaining frame and a lifting drive device. The retaining frame is slidably connected to the second box body in a vertical direction. The lifting drive device is hinged to the second box body to drive the second box body to approach and abut against the first box body.

5. The environmental simulation device for landing gear cushioning performance test according to claim 1, characterized in that: The inner side walls of the second box body and the first box body are provided with a heat insulation layer, and the inner side wall of the second box body is also provided with a temperature sensor.

6. The environmental simulation device for landing gear cushioning performance test according to claim 1, characterized in that: The displacement device is also provided with an electric control cabinet, and the electric control cabinet is electrically connected to the ambient temperature control device.

7. The environmental simulation device for landing gear cushioning performance test according to claim 1, characterized in that: A plurality of counterweight blocks are detachably arranged in the hanging basket, and the counterweight blocks are used to adjust the potential energy of the landing gear during falling impact.

8. The environmental simulation device for landing gear cushioning performance test according to claim 1, characterized in that: It also includes a wheel belt rotation mechanism, which is fixed to the test bench and is used to drive the tire at the bottom of the landing gear to rotate.

9. The environmental simulation device for landing gear cushioning performance test according to claim 1, characterized in that: It also includes a force measuring platform, which is arranged on the test bench and is used to measure the impact data when the landing gear falls.

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