Airplane landing gear touchdown velocity simulation system and method

Abstract

The application provides an airplane landing gear ground contact speed simulation system and method, and relates to the technical field of landing gear verification equipment; the airplane landing gear ground contact speed simulation system comprises a rack, a simulation assembly and a lifting mechanism. The simulation assembly comprises a power unit and a sliding seat arranged on the rack; the power unit can drive the sliding seat to ascend; the sliding seat comprises a landing gear mounting portion and a bearing portion; the landing gear mounting portion is used for mounting the landing gear; and a plurality of layers of counterweight blocks are stacked on the bearing portion. The lifting mechanism comprises a driving assembly and a lifting unit arranged on the rack; the lifting unit can be driven by the driving assembly to descend or ascend on the rack; and the lifting unit comprises a supporting plate which can be inserted between any two adjacent layers of counterweight blocks. The airplane landing gear ground contact speed simulation system can better simulate the ground contact state of the landing gear and provide data for the optimization of the landing gear.

Description

Technical Field

[0001] This invention relates to the field of landing gear verification equipment technology, specifically to an aircraft landing gear ground contact speed simulation system and method. Background Technology

[0002] The dynamic response of aircraft landing gear during the taxiing and braking process is one of the important topics in aircraft landing gear dynamics research. It mainly studies the dynamic characteristics of landing gear structure and braking system during the taxiing and braking process and the failure mechanism.

[0003] The load on an aircraft landing gear increases dramatically at the moment of contact with the ground, so the state of the landing gear at that moment is crucial to the safety of both the landing gear and the aircraft. However, current landing gear state simulation equipment often only simulates the state of the landing gear after contact with the ground, lacking simulation of the state of the landing gear at the moment of contact. Therefore, data on this aspect is lacking for landing gear optimization. Summary of the Invention

[0004] Therefore, this invention proposes an aircraft landing gear ground contact speed simulation system and method to better simulate the landing gear ground contact state.

[0005] The technical solution of the present invention is as follows: In a first aspect, the present invention provides an aircraft landing gear ground contact speed simulation system, comprising: frame; The simulation component includes a power unit and a sliding seat mounted on the frame. The power unit can drive the sliding seat to rise, and the sliding seat includes a landing gear mounting part and a load-bearing part. The landing gear mounting part is used to mount the landing gear, and several layers of counterweights are stacked on the load-bearing part. A lifting mechanism, comprising a drive assembly and a lifting unit disposed on the frame, wherein the lifting unit is driven by the drive assembly to descend or rise on the frame, and the lifting unit includes a tray that can be inserted between any two adjacent layers of the counterweights; The pallet can be inserted under several layers of the counterweights and can be driven by the drive assembly to lift each of the counterweights so as to leave a predetermined weight of the counterweights on the sliding seat; and the power unit can drive the sliding seat to rise a predetermined distance so that the landing gear can touch the ground as the sliding seat falls.

[0006] Furthermore, the load-bearing part includes a sliding frame that is slidably disposed on the frame, and the landing gear mounting part includes a mounting plate fixed to the bottom end of the sliding frame.

[0007] Furthermore, the power unit consists of two first hydraulic cylinders fixed on the frame and disposed on both sides of the sliding frame. The sliding frame is provided with two support plates, and the telescopic rods of the two first hydraulic cylinders can support the two support plates accordingly.

[0008] Furthermore, a weighing sensor is installed on the telescopic rod of each of the two first hydraulic cylinders.

[0009] Furthermore, the drive assembly includes a fixed base, a lifting plate, and a drive unit; the fixed base is fixed on the frame and a nut is fixed on the fixed base; the lifting plate is movably mounted on the fixed base; the drive unit includes a first motor and a ball screw; the first motor is mounted on the lifting plate and the ball screw is mounted on the lifting plate and can be driven to rotate by the first motor; and the ball screw is screwed to the nut.

[0010] Furthermore, each of the counterweights has a plurality of support grooves on its bottom surface, and each support groove has an opening located on the side of the counterweight; the lifting unit includes a plurality of rotary power output devices disposed on the lifting plate, and each support plate is disposed on the output end of the rotary power output device, and each support plate can be driven by the rotary power output device to rotate from the opening and insert into the corresponding support groove, or to disengage from the support groove.

[0011] Furthermore, two brake plates are fixed on the frame, and the two brake plates are respectively placed on two opposite sides of the sliding seat. A brake capable of gripping or releasing the corresponding brake plate is fixed on each of the two opposite sides of the sliding seat.

[0012] Furthermore, a plurality of guide rods are fixedly provided on the bearing part, and each of the counterweights is provided with guide through holes that are slidably sleeved on each of the guide rods; a plurality of guide rods are fixedly provided on the frame, and the guide rods of the bearing part and the guide rods of the frame correspond one-to-one in the vertical direction; The pallet can be inserted under several layers of the counterweights. The pallet drives the counterweights to move along the guide rod of the bearing part. The counterweights disengage from the guide rod of the bearing part and move along the guide rod of the frame until they move to a predetermined position.

[0013] Furthermore, the frame is provided with a plurality of second hydraulic cylinders, and the sliding seat is provided with a plurality of connecting plates. The telescopic ends of each second hydraulic cylinder are connected to each of the connecting plates in a one-to-one correspondence, and each second hydraulic cylinder can apply downward pressure to the connecting plate.

[0014] On the other hand, the present invention provides a method for simulating the landing gear ground contact speed of an aircraft, which applies the above-mentioned aircraft landing gear ground contact speed simulation system and includes the following steps: Install the landing gear to be tested on the landing gear mounting part of the sliding seat; After the telescopic rod of the first hydraulic cylinder pushes the sliding seat to a predetermined height, the sliding seat is fixed, and the lifting mechanism lifts part of the counterweight, leaving a counterweight of predetermined weight on the sliding seat. After the extension rod of the first hydraulic cylinder retracts to its lowest point, the sliding seat is released, causing the landing gear to fall with the sliding seat and touch the ground. After the landing gear touches the ground, each of the second hydraulic cylinders applies pressure to the sliding seat.

[0015] The working principle and beneficial effects of this invention are as follows: The aircraft landing gear ground contact speed simulation system provided by the present invention uses a simulation component and a lifting mechanism set on the frame. The lifting mechanism can lift part of the counterweight on the sliding seat, leaving a predetermined weight of counterweight on the sliding seat to simulate the weight of the aircraft. After the power unit drives the sliding seat to rise to a predetermined height on the frame, the landing gear can fall freely with the sliding seat and touch the ground, thereby simulating the landing gear ground contact state and providing data for landing gear optimization. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 A perspective view of an aircraft landing gear ground contact speed simulation system provided in an embodiment of the present invention; Figure 2 This is a front view of the aircraft landing gear ground contact speed simulation system provided in an embodiment of the present invention; Figure 3 for Figure 1 A magnified view of a section at point A in the middle; Figure 4 A perspective view of the lifting mechanism provided in an embodiment of the present invention; Figure 5 This is an exploded view of the two counterweights used in an embodiment of the present invention. Figure 6 for Figure 5 A magnified view of a section at point B in the middle; Figure 7 This is an exploded view of the counterweight provided in an embodiment of the present invention.

[0018] In the diagram: 100, frame; 110, column; 120, crossbeam; 130, guide rail; 140, brake plate; 200. Simulation component; 210. Power unit; 211. First hydraulic cylinder; 220. Sliding seat; 221. Sliding frame; 222. Mounting plate; 230. Counterweight; 240. Guide column; 241. Fixed section; 242. Guide section; 201. Support groove; 202. Through hole; 203. Guide hole; 204. Limiting groove; 300. Lifting mechanism; 310. Drive assembly; 311. Fixed base; 312. Lifting plate; 313. Nut; 314. Drive unit; 315. First motor; 316. Ball screw; 320. Lifting unit; 321. Rotary power output device; 322. Support plate; 400. Limiting rod; 410. Thrust end; 420. Elastic element; 500. Brake; 600. Second hydraulic cylinder. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] This embodiment provides an aircraft landing gear ground contact speed simulation system, reference Figure 1 and Figure 2 As shown, it includes a frame 100, a simulation component 200, and a lifting mechanism 300. The simulation component 200 includes a power unit 210 and a sliding seat 220 mounted on the frame 100. The power unit 210 can drive the sliding seat 220 to rise. The sliding seat 220 includes a landing gear mounting part and a support part. The landing gear mounting part is used to mount the landing gear, and several layers of counterweights 230 are stacked on the support part.

[0021] The lifting mechanism 300 includes a drive assembly 310 and a lifting unit 320 mounted on the frame 100. The lifting unit 320 can be driven by the drive assembly 310 to descend or rise on the frame 100. The lifting unit 320 includes a tray 322 that can be inserted between any two adjacent counterweights 230.

[0022] Based on the above structure, the aircraft landing gear ground contact speed simulation system of this embodiment can lift part of the counterweight 230 on the sliding seat 220 by the lifting mechanism 300, so that a counterweight 230 of predetermined weight is left on the sliding seat 220, so as to better simulate the load applied to the landing gear when the landing gear touches the ground, and the power unit 210 can drive the sliding seat 220 to rise to a predetermined height, and then the landing gear can fall with the sliding seat 220 and touch the ground, thus completing the simulation of the landing gear ground contact state and providing data for the optimization of the landing gear.

[0023] In terms of specific structure, refer to Figure 1 As shown, the frame 100 in this embodiment includes two uprights 110 and a crossbeam 120 connecting the tops of the two uprights 110. Each of the two uprights 110 includes a main body and two legs arranged in a V-shape at the bottom of the main body. Obviously, the structure of the frame 100 is not limited to this; it can be used as long as it provides a mounting base for other components and has sufficient strength.

[0024] refer to Figure 1 and Figure 3 As shown, the support unit in this embodiment includes a sliding frame 221 that is slidably mounted on the frame 100. The sliding frame 221 has two accommodating cavities with open tops, and counterweights 230 are stacked in the two accommodating cavities respectively.

[0025] In this embodiment, reference Figure 1 and Figure 3 As shown, several guide rails 130 are fixed on the two columns 110 respectively, and sliders that can slide on each guide rail 130 are fixed on the sliding frame 221; wherein, the length direction of each guide rail 130 is parallel to the height direction of the frame 100. By sliding each slider on the corresponding guide rail 130, the sliding frame 221 can rise or fall relative to the frame 100.

[0026] refer to Figure 2 As shown, in this embodiment, the power unit 210 consists of two first hydraulic cylinders 211 fixed on the frame 100 and positioned on both sides of the sliding frame 221. The sliding frame 221 has two support plates, and the telescopic rods of the two first hydraulic cylinders 211 can support the two support plates respectively. In this embodiment, by setting up the power unit 210, the telescopic rods of the two first hydraulic cylinders 211 can extend upwards and abut against the corresponding support plates. Subsequently, the continued extension of the telescopic rods of the two first hydraulic cylinders 211 can drive the sliding seat 220 to rise. When the sliding seat 220 needs to fall freely, the telescopic rods of the two first hydraulic cylinders 211 can be retracted in advance.

[0027] In this embodiment, load cells are respectively installed on the telescopic rods of the two first hydraulic cylinders 211 to weigh the sliding seat 220, thereby ensuring that the weight of the sliding seat 220 is the required weight and guaranteeing the reliability of the simulation results. It should be noted that the load cells can be existing products, and their structure and working principle will not be described in detail here.

[0028] In some embodiments, the number of first hydraulic cylinders 211 may be one, three, four, or more. In some embodiments, the power unit 210 may also be a cylinder or the like.

[0029] refer to Figure 2 As shown, the landing gear mounting part in this embodiment includes a mounting plate 222 fixed to the bottom end of the sliding frame 221. The landing gear can be mounted on the mounting plate 222, thus fixing the landing gear on the sliding seat 220. It should be noted that the fixing of the landing gear on the mounting plate 222 can refer to the prior art, and will not be described in detail here.

[0030] In this embodiment, reference Figure 1 and Figure 2 As shown, corresponding to the two sets of counterweights 230, a lifting mechanism 300 is provided on each of the two opposite sides of each set of counterweights 230; the working principle of each lifting mechanism 300 is different, and this embodiment will take one set as an example to introduce it.

[0031] refer to Figure 1 , Figure 2 and Figure 4 As shown, the drive assembly 310 of this embodiment includes a fixed base 311, a lifting plate 312, and a drive unit 314. The fixed base 311 is fixedly mounted on the frame 100 and has a nut 313. The lifting plate 312 is vertically mounted on the fixed base 311. Specifically, in this embodiment, a slider is fixedly mounted on the fixed base 311, and a guide rail 130 is fixedly mounted on the lifting plate 312, allowing the lifting plate 312 to rise or fall relative to the fixed base 311 and the frame 100.

[0032] In this embodiment, reference Figure 4As shown, the drive unit 314 includes a first motor 315 and a ball screw 316. The first motor 315 is mounted on the lifting plate 312, and the ball screw 316 is mounted on the lifting plate 312 and can be driven to rotate by the first motor 315. The ball screw 316 is screwed to a nut 313. Specifically, in this embodiment, a first pulley is fixedly sleeved on the output shaft of the first motor 315, and a second pulley, coaxial with and fixedly connected to the ball screw 316, is provided on the lifting plate 312. A belt is provided between the first pulley and the second pulley. It should be noted that the first motor 315 can also directly drive the ball screw 316 to rotate, or it can drive the ball screw 316 to rotate through gears or sprockets, all with the same working principle.

[0033] Based on the above structure, when the motor shaft of the first motor 315 rotates, it will drive the ball screw 316 to rotate through the transmission of the first pulley and the second pulley. When the ball screw 316 rotates, it will have a displacement relative to the nut 313 along the axial direction of the ball screw 316, so that the lifting plate 312 rises or falls along the height direction of the frame 100.

[0034] refer to Figure 4 and Figure 5 As shown, in this embodiment, corresponding to each lifting plate 312, two support grooves 201 are respectively provided on the bottom surface of the counterweight 230, and each support groove 201 has an opening located on the side of the counterweight 230. Each lifting plate 312 is provided with a lifting unit 320, and each lifting unit 320 includes two rotary power output devices 321 fixed on the lifting plate 312. Specifically, in this embodiment, the rotary power output device 321 is a second motor. In some embodiments, the rotary power output device 321 may also be a rotary cylinder, etc.

[0035] In this embodiment, reference Figure 4 As shown, each of the aforementioned support plates 322 is fixedly provided on the output end of each rotary power output device 321. When the rotary power output device 321 drives the corresponding support plate 322 to rotate, the support plate 322 can be rotated into the support groove 201 from the opening, or rotated out of the support groove 201. When the support plate 322 is rotated into the support groove 201, that is, when the support plate 322 is inserted between two adjacent counterweights 230, when the drive assembly 310 drives the lifting unit 320 to rise, it can lift the counterweight 230 and the counterweights 230 above it, so that the counterweight 230 and the counterweights 230 above it are disengaged from the sliding seat 220, leaving a predetermined weight of counterweights 230 on the sliding seat 220.

[0036] In this embodiment, by setting up the lifting unit 320, the support plate 322 can be inserted between any two adjacent counterweights 230, so that the lifting mechanism 300 can lift any number of counterweights 230 in a relatively convenient way, so as to leave a predetermined weight of counterweights 230 on the sliding seat 220.

[0037] In this embodiment, four guide rods are fixedly mounted on the sliding frame 221, and each counterweight has a guide through hole that can be fitted onto each guide rod, so that the counterweights are aligned by fitting each guide through hole onto the corresponding guide rod. In some embodiments, the number of guide rods may also be two, three, or other numbers; at the same time, in order to make the counterweight 230 run stably to the predetermined position, a connecting beam is installed between the two columns 110 of the frame, and guide rods are installed below the connecting beam. Multiple guide rods are fixedly mounted on the connecting beam, and the guide rods of the bearing part correspond one-to-one with the guide rods of the connecting beam in the vertical direction, and the length direction of the guide rods is all extended in the vertical direction. When the sliding seat 220 is being counterweighted, the drive assembly 310 drives the lifting unit 320 to descend. The support plate 322 of the lifting unit 320 inserts below several layers of counterweight blocks 230. The support plate 322 drives the counterweight blocks 230 to move along the guide rod of the bearing portion. The support plate 322 continues to move vertically upward, and the counterweight blocks 230 disengage from the guide rod of the bearing portion and move along the guide rod of the connecting beam until they reach a predetermined position. In some embodiments, reference may also be made to... Figure 5 As shown, each counterweight 230 has a through hole 202, and a guide post 240 is fixedly inserted into each through hole 202. Each guide post 240 has a guide hole 203 on its bottom end face, and each guide post 240 has a guide section 242 that can be inserted into the guide hole 203 on the adjacent upper counterweight 230.

[0038] Specifically, the guide post 240 in this embodiment includes a fixed section 241 and a guide section 242 connected in series. The fixed section 241 is used to fix and insert into the through hole 202, while the guide section 242 protrudes upward from the counterweight 230, and the diameter of the guide section 242 is smaller than the diameter of the fixed section 241. The guide section 242 can be inserted into the guide hole 203 on the bottom end face of the other fixed section 241.

[0039] In this embodiment, by setting the guide hole 203 and guide segment 242, the two adjacent counterweights 230 can be aligned by inserting the guide segment 242 into the guide hole 203, so that the counterweights 230 of each layer are aligned.

[0040] refer to Figure 6 and Figure 7As shown, in this embodiment, limiting grooves 204 are respectively formed on the sidewalls of each guide section 242, and clearance holes opposite to the limiting grooves 204 are provided on the sidewalls of the fixed section 241. A limiting rod 400 is slidably provided on the counterweight 230. The limiting rod 400 has a push end 410 protruding from the sidewall of the support groove 201, and an elastic element 420 is provided between the limiting rod 400 and the counterweight 230. The limiting rod 400 can be pushed into the limiting groove 204 by the elastic element 420, and when the support plate 322 is rotated and inserted into the support groove 201, it can push the push end 410 to make the limiting rod 400 disengage from the limiting groove 204.

[0041] In other words, in this embodiment, when a counterweight 230 is placed on the lower counterweight 230, the support plate 322 pushes the bearing end 410 of the limiting rod 400 on the lower counterweight 230, so that the guide section 242 on the lower counterweight 230 can be inserted into the guide hole 203 on the lower counterweight 230. When the support plate 322 is removed from the limiting groove 204, the limiting rod 400 is pushed into the limiting groove 204 of the guide section 242 on the lower counterweight 230 by the elastic member 420, thereby fixing the two counterweights 230 together. After fixing the bottommost counterweight 230 to the sliding seat 220, the overall counterweights 230 on the sliding seat 220 are fixed to the sliding seat 220 by fixing the two adjacent counterweights 230. By fixing each counterweight 230 to the sliding seat 220, it is possible to prevent each counterweight 230 from bouncing up when the sliding seat 220 falls to the ground and the landing gear touches the ground.

[0042] In some embodiments, a counterweight 230 capable of pressing the top layer and a pressure plate that fixes each counterweight 230 relative to the sliding seat 220 may also be provided on the sliding seat 220. However, the pressure plate needs to be able to move along the height direction of the frame 100 and also needs to be able to rotate. Compared with the solution in this embodiment, its structure is more complex.

[0043] In this embodiment, the elastic element 420 is a spring sleeved on the rod and abutting between the rod and the counterweight 230. In some embodiments, the elastic element 420 may also be other elastic components.

[0044] In this embodiment, reference Figure 3 As shown, brake plates 140 are fixed on the frame 100 and disposed on opposite sides of the sliding seat 220. A brake 500 is provided on the sliding seat 220 to engage or disengage the brake plates 140, thereby fixing the sliding seat 220 to the frame 100 or releasing it from the frame 100. It should be noted that the brake 500 can be an existing product; its structure and working principle will not be described in detail here.

[0045] In this embodiment, a displacement sensor for detecting the displacement of the sliding seat 220 is provided on the frame 100. By setting this displacement sensor, the instantaneous velocity of the sliding seat 220 can be calculated from its real-time displacement, thus better simulating the landing gear's ground contact state by approximating the instantaneous velocity of the sliding seat 220 upon contact with the ground with the aircraft's actual ground contact velocity. It should be noted that the displacement sensor can be an existing product; its structure and working principle will not be described in detail here. Since this does not affect understanding, the displacement sensor is not shown in the accompanying drawings of this embodiment.

[0046] refer to Figure 1 and Figure 3 As shown, in this embodiment, four second hydraulic cylinders 600 are provided on the frame 100, and four connecting plates are provided on the sliding seat 220 accordingly. The telescopic rods of each second hydraulic cylinder 600 are connected to the four connecting plates, and each second hydraulic cylinder 600 can apply downward pressure to the connecting plates.

[0047] In some embodiments, the number of the second hydraulic cylinders 600 described above may be two, three, or other numbers.

[0048] In this embodiment, by setting the aforementioned second hydraulic cylinders 600, the landing gear's ground contact state can be better simulated. Specifically, the counterweights 230 on the sliding seat 220 are used to simulate the equivalent mass of the aircraft, that is, the mass of components such as the fuselage, wings, and buffer outer cylinder is converted into the mass of the landing gear. The second hydraulic cylinders 600 are used to apply additional pressure to the landing gear, that is, the total pressure applied to the landing gear by the counterweights 230 and the second hydraulic cylinders 600 is equivalent to the pressure applied to the landing gear by the total weight of the aircraft. By applying pressure to the landing gear by the counterweights 230 and the second hydraulic cylinders 600 respectively, the actual ground contact state of the landing gear is more similar.

[0049] Based on the overall structure of the aircraft landing gear ground contact speed simulation system described above, this embodiment also provides an aircraft landing gear ground contact speed simulation method, which applies the aircraft landing gear ground contact speed simulation system described above, and includes the following steps: The landing gear to be tested is installed on the landing gear mounting part of the sliding seat 220; After the telescopic rod of the first hydraulic cylinder 211 pushes the sliding seat 220 to a predetermined height, the sliding seat 220 is fixed, and the lifting mechanism 300 lifts part of the counterweight 230, so that a counterweight 230 of predetermined weight is left on the sliding seat 220. After the telescopic rod of the first hydraulic cylinder 211 retracts to its lowest point, it releases the sliding seat 220, causing the landing gear to fall with the sliding seat 220 and touch the ground. After the landing gear touches the ground, each of the second hydraulic cylinders 600 applies a predetermined pressure to the sliding seat 220.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for simulating the ground contact speed of an aircraft landing gear, characterized in that, include: frame; The simulation component includes a power unit and a sliding seat mounted on the frame. The power unit can drive the sliding seat to rise, and the sliding seat includes a landing gear mounting part and a load-bearing part. The landing gear mounting part is used to mount the landing gear, and several layers of counterweights are stacked on the load-bearing part. A lifting mechanism, comprising a drive assembly and a lifting unit disposed on the frame, wherein the lifting unit is driven by the drive assembly to descend or rise on the frame, and the lifting unit includes a tray that can be inserted between any two adjacent layers of the counterweights; The pallet can be inserted under several layers of the counterweights and can be driven by the drive assembly to lift each of the counterweights so as to leave a predetermined weight of the counterweights on the sliding seat; and the power unit can drive the sliding seat to rise a predetermined distance so that the landing gear can touch the ground as the sliding seat falls. The drive assembly includes a fixed base, a lifting plate, and a drive unit; the fixed base is fixed on the frame and a nut is fixed on the fixed base; the lifting plate is movably mounted on the fixed base; the drive unit includes a first motor and a ball screw; the first motor is mounted on the lifting plate and the ball screw is mounted on the lifting plate and can be driven to rotate by the first motor; and the ball screw is screwed to the nut. Each of the counterweights has a plurality of support grooves on its bottom surface, and each support groove has an opening located on the side of the counterweight; the lifting unit includes a plurality of rotary power output devices disposed on the lifting plate, and each support plate is disposed on the output end of the rotary power output device, and each support plate can be driven by the rotary power output device to rotate from the opening into the corresponding support groove, or to disengage from the support groove; The frame is provided with a number of second hydraulic cylinders, and the sliding seat is provided with a number of connecting plates. The telescopic ends of each second hydraulic cylinder are connected to each of the connecting plates in a one-to-one correspondence, and each second hydraulic cylinder can apply downward pressure to the connecting plate.

2. The aircraft landing gear ground contact speed simulation system according to claim 1, characterized in that, The load-bearing part includes a sliding frame that is slidably disposed on the frame, and the landing gear mounting part includes a mounting plate fixed to the bottom end of the sliding frame.

3. The aircraft landing gear ground contact speed simulation system according to claim 2, characterized in that, The power unit consists of two first hydraulic cylinders fixed on the frame and disposed on both sides of the sliding frame. The sliding frame is provided with two support plates, and the telescopic rods of the two first hydraulic cylinders can support the two support plates respectively.

4. The aircraft landing gear ground contact speed simulation system according to claim 3, characterized in that, Weighing sensors are installed on the telescopic rods of the two first hydraulic cylinders respectively.

5. The aircraft landing gear ground contact speed simulation system according to claim 1, characterized in that, Two brake plates are fixed on the frame, and the two brake plates are respectively located on two opposite sides of the sliding seat. A brake capable of gripping or releasing the corresponding brake plate is fixed on each of the two opposite sides of the sliding seat.

6. The aircraft landing gear ground contact speed simulation system according to claim 1, characterized in that, The bearing part is fixedly provided with a plurality of guide rods, and each of the counterweights is provided with guide through holes that are slidably sleeved on each of the guide rods; the frame is fixedly provided with a plurality of guide rods, and the guide rods of the bearing part and the guide rods of the frame correspond one-to-one in the vertical direction; The pallet can be inserted under several layers of the counterweights. The pallet drives the counterweights to move along the guide rod of the bearing part. The counterweights disengage from the guide rod of the bearing part and move along the guide rod of the frame until they move to a predetermined position.

7. A method for simulating the ground contact speed of an aircraft landing gear, characterized in that, The application of the aircraft landing gear ground contact speed simulation system as described in any one of claims 1 to 6 includes the following steps: Install the landing gear to be tested on the landing gear mounting part of the sliding seat; After the telescopic rod of the first hydraulic cylinder pushes the sliding seat up to a predetermined height, the sliding seat is fixed, and the lifting mechanism lifts part of the counterweight, leaving a counterweight of predetermined weight on the sliding seat. After the extension rod of the first hydraulic cylinder retracts to its lowest point, the sliding seat is released, causing the landing gear to fall with the sliding seat and touch the ground. After the landing gear touches the ground, each of the second hydraulic cylinders applies a predetermined pressure to the sliding seat.

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