A truss landing gear mounting structure test fixture and test method

Abstract

The present application provides a kind of truss landing gear mounting structure test fixture and test method, for simulating the tensile test of unmanned aerial vehicle truss landing gear mounting structure, the test fixture includes: connecting end, for simulating the connection structure and load transmission of unmanned aerial vehicle truss landing gear rear joint;Fixed end, for simulating the connection of unmanned aerial vehicle truss landing gear rear joint and unmanned aerial vehicle fuselage;The connecting end one end loads load, the other end connects rear joint test piece and fixed end;The connecting end includes upper actuating cylinder force plate, and the upper actuating cylinder force plate is test bench loading clamping end, and the fixed end includes lower actuating cylinder force plate, and the lower actuating cylinder force plate is test bench fixed clamping end, the landing gear mounting structure test fixture design of the present application ensures that load is reasonably and stably transmitted, and landing gear rear joint tensile test is easy to perform.

Description

Technical Field

[0001] This invention relates to the field of aircraft structural design technology, and in particular to a test fixture and test method for a truss landing gear installation structure. Background Technology

[0002] Truss landing gear is a crucial load-bearing component for unmanned aerial vehicles (UAVs). During landing, it effectively absorbs vertical impact energy and cushions the load caused by the impact with the ground during dynamic descent. Its structural feature is the connection between the wheels and the fuselage (or wings) through a load-bearing structure. The members and shock-absorbing struts in this structure are hinged, bearing only axial forces and not bending moments. Truss landing gear is simple in structure and lightweight, making it widely used in low-speed, light aircraft. Truss landing gear primarily relies on structural elastic deformation to absorb the energy generated by the UAV's vertical velocity during landing, cushioning overload caused by landing impact, and supporting the weight of the UAV when parked. The load it bears is generally transferred from the frame and beam structures of the fuselage (or wing) to the truss through joints. As a critical component in the load transfer process, the strength and stiffness performance of the landing gear joints also require experimental verification. However, current landing gear testing fixtures are mostly designed around the entire structure, resulting in very complex testing equipment.

[0003] Therefore, it is necessary to study a test fixture and test method for truss-type landing gear installation structure to address the shortcomings of existing technologies and solve or mitigate one or more of the above-mentioned problems. Summary of the Invention

[0004] In view of this, the present invention provides a test fixture and test method for a truss-type landing gear installation structure. The design of the landing gear installation structure test fixture of the present invention ensures reasonable and stable load transfer, and the tensile test of the rear joint of the landing gear is easy to perform.

[0005] On one hand, the present invention provides a test fixture for a truss-type landing gear installation structure, used to simulate a tensile test of a truss-type landing gear installation structure for unmanned aerial vehicles (UAVs). The test fixture includes:

[0006] The connection end is used to simulate the connection structure and load transfer of the rear joint of the truss-type landing gear of a drone.

[0007] Fixed end, used to simulate the connection between the rear joint of the truss-type landing gear of a drone and the drone fuselage;

[0008] One end of the connection is loaded with a load, and the other end is connected to the rear joint test piece and the fixed end;

[0009] The connecting end includes an upper actuator cylinder force plate, which is the loading clamping end of the test bench. The fixing end includes a lower actuator cylinder force plate, which is the fixing clamping end of the test bench.

[0010] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the connecting end further includes a grooved connecting plate, a transfer joint assembly, an overlapping plate, and a double-ear connecting plate assembly. The lower part of the upper actuating cylinder force plate is connected to the transfer joint assembly through the grooved connecting plate. The overlapping plate is disposed below the transfer joint assembly, and the double-ear connecting plate assembly is connected to the transfer joint assembly.

[0011] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the groove-shaped connecting plate includes two symmetrically arranged L-shaped clamping plates. Each L-shaped clamping plate includes a back plate, a bottom plate, and two parallel side plates. The back plate and the bottom plate are connected by the two side plates. A through groove is formed between the two back plates. Both bottom plates are fixed to the intermediate connector assembly. The upper actuator force plate is disposed in the groove. Two back plates are respectively attached to the lower sides of the upper actuator force plate for fixation.

[0012] In addition to the aspects described above and any possible implementation, a further implementation is provided in which the transfer connector assembly includes a first transfer connector assembly and a second transfer connector assembly. The first transfer connector assembly includes a first fixing plate and a first base connected vertically. The second transfer connector assembly includes a second fixing plate and a second base connected vertically. The first base and the second base are fixed by an overlapping plate. The first fixing plate and the second fixing plate are placed parallel to each other and fixedly connected.

[0013] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the first adapter assembly further includes an I-shaped fixing member disposed on the first base, one end of the I-shaped fixing member being fixedly connected to a first fixing plate, and the other end being fixedly connected to two L-shaped clamping plates and an upper actuating cylinder force application plate.

[0014] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the double-ear connecting plate assembly includes a first double-ear connecting plate, a second double-ear connecting plate, a first double-ear connecting connector, and a second double-ear connecting connector. One end of the first double-ear connecting plate is connected to one end of the first base opposite to the first fixed plate, and the other end is connected to the first double-ear connecting connector. One end of the second double-ear connecting plate is connected to one end of the second base opposite to the second fixed plate, and the other end is connected to the second double-ear connecting connector. Both double-ear connecting connectors are connected to the rear connector test piece.

[0015] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the fixed end further includes an intermediate plate and a three-ear connecting plate, the intermediate plate being connected to the three-ear connecting plate, the rear connector test piece, the intermediate plate, and the three-ear connecting plate being sequentially fixed by bolts, and the three-ear connecting plate simultaneously connecting the lower actuator force plate and two double-ear connecting joints.

[0016] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the I-shaped fastener includes a first I-shaped fixing surface, a second I-shaped fixing surface, and a third I-shaped fixing surface. The first I-shaped fixing surface and the second I-shaped fixing surface are arranged in parallel. The third I-shaped fixing surface is perpendicular to both the first I-shaped fixing surface and the second I-shaped fixing surface. The first I-shaped fixing surface is connected to the second I-shaped fixing surface through the third I-shaped fixing surface. The first I-shaped fixing surface, the second I-shaped fixing surface, and the third I-shaped fixing surface are all perpendicular to the first base. The first I-shaped fixing surface and the second I-shaped fixing surface are both parallel to the first fixing plate.

[0017] In addition to the aspects and any possible implementations described above, a further implementation is provided in which the I-shaped fastener further includes an I-shaped fastener connecting plate, the first I-shaped fastening surface is perpendicular to the I-shaped fastener connecting plate, one side of the first I-shaped fastening surface is connected to a first fastening plate through the I-shaped fastener connecting plate, the first I-shaped fastening surface is simultaneously fixedly connected to one side plate of two L-shaped clamping plates, the second I-shaped fastening surface is simultaneously fixedly connected to the other side plate of two L-shaped clamping plates, the third I-shaped fastening surface is simultaneously connected to the back plate of two L-shaped clamping plates and the upper actuating cylinder force application plate, and the bottom plates of the two L-shaped clamping plates are fixed on the first base.

[0018] In accordance with the aspects and any possible implementations described above, a test method for a truss-type landing gear installation structure is further provided, which is implemented by the aforementioned test fixture. The test method specifically involves: using the upper actuator cylinder force plate as the loading clamping end of the test bench, the lower actuator cylinder force plate as the fixed clamping end of the test bench, forming a certain angle with the rear joint through the double-ear connecting assembly, fixing the angle with the intermediate transfer joint assembly, and using the intermediate plate and the three-ear connecting plate to form a test piece fixing plate to conduct a tensile test simulating the truss-type landing gear installation structure of an unmanned aerial vehicle.

[0019] Compared with the prior art, the present invention can achieve the following technical effects:

[0020] This invention enables the fixation and loading of the rear joint of the truss landing gear in tensile tests, with a reasonable force transmission path and a stable and reliable structure.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a front view of the test fixture provided in one embodiment of the present invention;

[0024] Figure 2 This is a perspective view of the test fixture provided in one embodiment of the present invention;

[0025] Figure 3 This is an exploded view of a connection end testing fixture provided in one embodiment of the present invention;

[0026] Figure 4 This is an exploded view of a fixed-end testing fixture provided in one embodiment of the present invention.

[0027] In the figure:

[0028] Upper actuator force plate 1, grooved connecting plate 2, upper-middle transfer joint-left 3, upper-middle transfer joint-right 4, overlapping plate 5, double-ear connecting plate-short 6, double-ear connecting plate-long 7, double-ear connecting joint 8; fixed end: middle plate 9, three-ear connecting plate 10, lower actuator force plate 11. Detailed Implementation

[0029] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0032] This invention provides a test fixture for a truss-type landing gear installation structure, used to simulate tensile tests on a truss-type landing gear installation structure of an unmanned aerial vehicle (UAV). The test fixture includes:

[0033] The connection end is used to simulate the connection structure and load transfer of the rear joint of the truss-type landing gear of a drone.

[0034] Fixed end, used to simulate the connection between the rear joint of the truss-type landing gear of a drone and the drone fuselage;

[0035] One end of the connection is loaded with a load, and the other end is connected to the rear joint test piece and the fixed end;

[0036] The connecting end includes an upper actuator cylinder force plate, which is the loading clamping end of the test bench. The fixing end includes a lower actuator cylinder force plate, which is the fixing clamping end of the test bench.

[0037] The connecting end also includes a grooved connecting plate, a transfer joint assembly, an overlapping plate, and a double-ear connecting plate assembly. The lower part of the upper actuator cylinder force plate is connected to the transfer joint assembly through the grooved connecting plate. The overlapping plate is located below the transfer joint assembly, and the double-ear connecting plate assembly is connected to the transfer joint assembly.

[0038] The grooved connecting plate includes two symmetrically arranged L-shaped clamping plates. Each L-shaped clamping plate includes a back plate, a bottom plate, and two parallel side plates. The back plate and the bottom plate are connected by the two side plates. A through groove is formed between the two back plates. Both bottom plates are fixed to the intermediate connector assembly. The upper actuator cylinder force plate is set in the groove. Two back plates are attached to the lower sides of the upper actuator cylinder force plate for fixation.

[0039] The transfer connector assembly includes a first transfer connector assembly and a second transfer connector assembly. The first transfer connector assembly includes a first fixing plate and a first base connected vertically. The second transfer connector assembly includes a second fixing plate and a second base connected vertically. The first base and the second base are fixed by an overlapping plate. The first fixing plate and the second fixing plate are parallel to each other and fixedly connected. The entire transfer connector assembly is a one-piece machined part.

[0040] The first transfer connector assembly also includes an I-shaped fixing member, which is disposed on the first base. One end of the I-shaped fixing member is fixedly connected to the first fixing plate, and the other end is simultaneously fixedly connected to two L-shaped clamping plates and the upper actuating cylinder force application plate.

[0041] The double-ear connecting plate assembly includes a first double-ear connecting plate, a second double-ear connecting plate, a first double-ear connecting connector, and a second double-ear connecting connector. One end of the first double-ear connecting plate is connected to the end of the first base opposite to the first fixed plate, and the other end is connected to the first double-ear connecting connector. One end of the second double-ear connecting plate is connected to the end of the second base opposite to the second fixed plate, and the other end is connected to the second double-ear connecting connector. Both double-ear connecting connectors are connected to the rear connector test piece.

[0042] The fixed end also includes an intermediate plate and a three-ear connecting plate. The intermediate plate is connected to the three-ear connecting plate. The rear connector test piece, the intermediate plate and the three-ear connecting plate are fixed in sequence by bolts. The three-ear connecting plate is also connected to the lower actuator force plate and two double-ear connecting joints.

[0043] The I-shaped fastener includes a first I-shaped fixing surface, a second I-shaped fixing surface, and a third I-shaped fixing surface. The first I-shaped fixing surface and the second I-shaped fixing surface are arranged in parallel. The third I-shaped fixing surface is perpendicular to both the first I-shaped fixing surface and the second I-shaped fixing surface. The first I-shaped fixing surface is connected to the second I-shaped fixing surface through the third I-shaped fixing surface. The first I-shaped fixing surface, the second I-shaped fixing surface, and the third I-shaped fixing surface are all perpendicular to the first base. The first I-shaped fixing surface and the second I-shaped fixing surface are both parallel to the first fixing plate.

[0044] The I-shaped fastener also includes an I-shaped fastener connecting plate. The first I-shaped fastening surface is perpendicular to the I-shaped fastener connecting plate. One side of the first I-shaped fastening surface is connected to the first fastening plate through the I-shaped fastener connecting plate. The first I-shaped fastening surface is also fixedly connected to one side plate of two L-shaped clamping plates. The second I-shaped fastening surface is also fixedly connected to the other side plate of two L-shaped clamping plates. The third I-shaped fastening surface is also connected to the back plate of two L-shaped clamping plates and the upper actuating cylinder force application plate. The bottom plates of the two L-shaped clamping plates are fixed on the first base.

[0045] The present invention also provides a test method for a truss-type landing gear installation structure, which is implemented by the aforementioned test fixture. The test method specifically involves: using the upper actuator cylinder force plate as the loading clamping end of the test bench, the lower actuator cylinder force plate as the fixed clamping end of the test bench, forming a certain angle with the rear joint through the double-ear connecting assembly, fixing the angle with the intermediate transfer joint assembly, and using the intermediate plate and the three-ear connecting plate to form a test piece fixing plate to conduct a tensile test simulating the truss-type landing gear installation structure of an unmanned aerial vehicle.

[0046] Example 1:

[0047] This invention provides a truss-type landing gear installation structure test fixture composed of an actuator force-applying plate, a grooved connecting plate, an intermediate transition joint, an overlapping plate, a double-ear connecting plate, a double-ear connecting joint, an intermediate plate, and a three-ear connecting plate, to achieve the fixation and loading of the rear joint test piece in the tensile test of the landing gear installation structure.

[0048] In one specific embodiment, the actuator force-applying plate of the present invention has a panel providing a clamping end for the test device and a fixing screw hole for the grooved connecting plate, wherein the actuator force-applying plate is screwed to the grooved connecting plate. In the tensile test, the test bench applies a load through the clamping end, which is transmitted via the force-applying plate and the grooved connecting plate;

[0049] In one specific embodiment, the grooved connecting plate of the present invention provides a fixing screw hole for the actuator cylinder force plate and the intermediate adapter joint on its panel. The grooved connecting plate serves as a connecting member between the actuator cylinder force plate and the intermediate adapter joint, and plays a role in fixing and connecting to ensure the smooth transmission of load.

[0050] In one specific embodiment, the intermediate connecting joint involved in this invention comprises left and right parts (i.e., a first intermediate connecting joint assembly and a second intermediate connecting joint assembly). The left and right joints are provided with connecting plate screw holes and double-ear connecting plate fixing holes. The left and right parts of the intermediate connecting joint are connected to each other through screw holes and overlapping plates, and also connected to the grooved connecting plate. Because the double-ear connecting plate of the simulated landing gear truss has a certain angle, the load borne by each part of the connecting joint differs during force transmission. Separate connecting joints are convenient to install and also facilitate reinforcement design based on different stresses.

[0051] In one specific embodiment, the double-ear connecting plate of the present invention is connected at one end to the loading end of the test bench through an intermediate connecting joint, and at the other end to the landing gear rear joint test piece through a double-ear connecting joint. The double-ear connecting plate is of different lengths to simulate the actual angle between the landing gear strut and the rear joint.

[0052] In one specific embodiment, the double-ear connector of the present invention has double-ear connecting ears that are respectively connected to a double-ear connecting plate and a rear connector test piece. The double-ear connecting ears can rotate around the bolt fixing holes of the rear connector, which facilitates the simulation of various angles of connection between the support and the rear connector.

[0053] In one specific embodiment, the intermediate plate of the present invention provides fixing screw holes for the rear connector test piece and the three-ear connecting plate, which serve to fix and connect them.

[0054] In one specific embodiment, the three-ear connecting plate of the present invention provides fixing bolt holes for the rear connector test piece and the intermediate plate on its panel, and also provides connecting lugs for the actuator force plate. The three-ear connecting plate is screwed together with the intermediate plate and the actuator force plate to simulate the connection between the rear connector test piece and the machine body.

[0055] like Figure 1 As shown, the test fixture for the truss-type landing gear installation structure in this invention is positioned as follows: The connecting end includes: an upper actuator cylinder force-applying plate 1, a grooved connecting plate 2, an upper-middle transition joint-left 3 (i.e., the first transition joint assembly), an upper-middle transition joint-right 4 (i.e., the second transition joint assembly), an overlapping plate 5, a double-ear connecting plate-short 6 (i.e., the first double-ear connecting plate), a double-ear connecting plate-long 7 (i.e., the second double-ear connecting plate), and a double-ear connecting joint 8 (i.e., the left side is the first double-ear connecting joint, and the right side is the second double-ear connecting joint); the fixed end includes: a middle plate 9, a three-ear connecting plate 10, and a lower actuator cylinder force-applying plate 11. (See diagram below.) Figure 2As shown, the connecting end mainly serves to simulate the connection structure and load transfer of the truss-type landing gear rear joint. The upper actuator cylinder force plate 1 serves as the loading clamping end of the test bench. The double-ear connecting plate-short 6 and double-ear connecting plate-long 7 serve as parts simulating the landing gear strut. They form a certain angle with the rear joint through the double-ear connecting joint 8, and the angle is fixed by the upper-middle transition joint-left 3 and upper-middle transition joint-right 4. The fixing end mainly serves to simulate the connection between the rear joint and the fuselage. The lower actuator cylinder force plate 11 serves as the fixed clamping end of the test bench. The middle plate 9 and the three-ear connecting plate 10 form the test piece fixing plate. The left and right middle transition joints and the overlapping plate, the left and right middle transition joints, and the left and right middle transition joints and the channel plate are directly connected by bolts.

[0056] When conducting a tensile test on the test specimen, firstly, the rear joint test specimen is bolted to the intermediate plate 9 and the three-ear connecting plate 10 to form the test specimen part. Then, the upper actuator force plate 1, the grooved connecting plate 2, the upper-middle transition joint-left 3, the upper-middle transition joint-right 4, the overlapping plate 5, the double-ear connecting plate-short 6, the double-ear connecting plate-long 7, and the double-ear connecting joint 8 are bolted together to form the connecting end part. Finally, the connecting end, the test specimen, and the lower actuator force plate 11 are bolted together and fixed on the test bench. The connecting end fixture is as follows: Figure 3 As shown, the fixed end fixture is as follows Figure 4 As shown.

[0057] The foregoing has provided a detailed description of the test fixture and test method for a truss-type landing gear installation structure provided in the embodiments of this application. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of this application; furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

[0058] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of illustrating the general principles of this application and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0059] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0060] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0061] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A test fixture for a truss-type landing gear installation structure, used to simulate tensile tests on a truss-type landing gear installation structure of an unmanned aerial vehicle (UAV), characterized in that, The test fixture includes: The connection end is used to simulate the connection structure and load transfer of the rear joint of the truss-type landing gear of a drone. Fixed end, used to simulate the connection between the rear joint of the truss-type landing gear of a drone and the drone fuselage; One end of the connection is loaded with a load, and the other end is connected to the rear joint test piece and the fixed end; The connecting end includes an upper actuating cylinder force plate, which is the loading clamping end of the test bench; the fixing end includes a lower actuating cylinder force plate, which is the fixing clamping end of the test bench. The connecting end also includes a grooved connecting plate, a transfer joint assembly, an overlapping plate and a double-ear connecting plate assembly. The lower part of the upper actuating cylinder force plate is connected to the transfer joint assembly through the grooved connecting plate. The overlapping plate is disposed below the transfer joint assembly. The double-ear connecting plate assembly is connected to the transfer joint assembly. The grooved connecting plate includes two symmetrically arranged L-shaped clamping plates. Each L-shaped clamping plate includes a back plate, a bottom plate, and two parallel side plates. The back plate and the bottom plate are connected by the two side plates. A through groove is formed between the two back plates. Both bottom plates are fixed to the intermediate connector assembly. The upper actuator cylinder force plate is set in the groove. Two back plates are attached to the lower sides of the upper actuator cylinder force plate for fixation. The transfer connector assembly includes a first transfer connector assembly and a second transfer connector assembly. The first transfer connector assembly includes a first fixing plate and a first base that are vertically connected. The second transfer connector assembly includes a second fixing plate and a second base that are vertically connected. The first base and the second base are fixed by an overlapping plate. The first fixing plate and the second fixing plate are placed parallel to each other and fixedly connected.

2. The test fixture according to claim 1, characterized in that, The first transfer connector assembly also includes an I-shaped fixing member, which is disposed on the first base. One end of the I-shaped fixing member is fixedly connected to the first fixing plate, and the other end is simultaneously fixedly connected to two L-shaped clamping plates and the upper actuating cylinder force application plate.

3. The test fixture according to claim 1, characterized in that, The double-ear connecting plate assembly includes a first double-ear connecting plate, a second double-ear connecting plate, a first double-ear connecting connector, and a second double-ear connecting connector. One end of the first double-ear connecting plate is connected to the end of the first base opposite to the first fixed plate, and the other end is connected to the first double-ear connecting connector. One end of the second double-ear connecting plate is connected to the end of the second base opposite to the second fixed plate, and the other end is connected to the second double-ear connecting connector. Both double-ear connecting connectors are connected to the rear connector test piece.

4. The test fixture according to claim 1, characterized in that, The fixed end also includes an intermediate plate and a three-ear connecting plate. The intermediate plate is connected to the three-ear connecting plate. The rear connector test piece, the intermediate plate and the three-ear connecting plate are fixed in sequence by bolts. The three-ear connecting plate is also connected to the lower actuator force plate and two double-ear connecting joints.

5. The test fixture according to claim 2, characterized in that, The I-shaped fastener includes a first I-shaped fixing surface, a second I-shaped fixing surface, and a third I-shaped fixing surface. The first I-shaped fixing surface and the second I-shaped fixing surface are arranged in parallel. The third I-shaped fixing surface is perpendicular to both the first I-shaped fixing surface and the second I-shaped fixing surface. The first I-shaped fixing surface is connected to the second I-shaped fixing surface through the third I-shaped fixing surface. The first I-shaped fixing surface, the second I-shaped fixing surface, and the third I-shaped fixing surface are all perpendicular to the first base. The first I-shaped fixing surface and the second I-shaped fixing surface are both parallel to the first fixing plate.

6. The test fixture according to claim 5, characterized in that, The I-shaped fastener also includes an I-shaped fastener connecting plate. The first I-shaped fastening surface is perpendicular to the I-shaped fastener connecting plate. One side of the first I-shaped fastening surface is connected to the first fastening plate through the I-shaped fastener connecting plate. The first I-shaped fastening surface is also fixedly connected to one side plate of two L-shaped clamping plates. The second I-shaped fastening surface is also fixedly connected to the other side plate of two L-shaped clamping plates. The third I-shaped fastening surface is also connected to the back plate of two L-shaped clamping plates and the upper actuating cylinder force application plate. The bottom plates of the two L-shaped clamping plates are fixed on the first base.

7. A test method for a truss-type landing gear installation structure, implemented using the test fixture described in claim 6, characterized in that, The test method for the truss-type landing gear installation structure is as follows: the upper actuator cylinder force plate is used as the loading clamping end of the test bench, and the lower actuator cylinder force plate is used as the fixed clamping end of the test bench. The double-ear connecting plate assembly forms a certain angle with the rear joint and is fixed by the intermediate joint assembly. The intermediate plate and the three-ear connecting plate form the test piece fixing plate to conduct a tensile test on the truss-type landing gear installation structure of the unmanned aerial vehicle.

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