Detection device for testing stress distribution of connection points of UAV skin parts

Abstract

The present invention relates to the technical field of unmanned aerial vehicles, and provides a detection device for testing the stress distribution of connection points of unmanned aerial vehicle skin parts. The device includes a support frame, a skeleton simulation part, a pulley block, a weight module, and a deformation detection structure. The bottom surface of the skeleton simulation part is fixed to the support frame, and screw holes for connecting with the skin parts are arranged on the upper surface; the pulley block is fixed to the support frame and is located above the skeleton simulation part; the rope belt assembly includes a plurality of rope belts, one end of each rope belt is fixedly connected to the tension transmission part of the skin part, and the other end applies a stable tension through the weight module. The deformation detection structure includes a three-layer composite structure for primary detection and a detection tape structure for secondary detection. The three-layer composite structure includes an outer glue layer and a deformation detection glue layer in the middle. The structure of the present invention is simple and the operation is convenient, which can realize the staged precise detection of the stress distribution of the connection points and the visual detection of the sealing performance. The detection result is intuitive and reliable, and the detection material can be reused.

Description

Technical Field

[0001] The invention relates to the technical field of unmanned aerial vehicle manufacturing, and in particular to a detection device for testing stress distribution at connection points of skin parts of unmanned aerial vehicles. Background Art

[0002] Drones come in many types and specifications, including portable tactical reconnaissance drones and reconnaissance and strike drones with large payloads. Compared with civilian drones, drones face more complex and harsh working environments and need to maintain good performance under harsh conditions such as high altitude, high cold, and high humidity. The cabin of a drone usually contains multiple skin components, such as Figures 1-2 A typical skin part 01 shown (oblique top view and oblique side view) is made of glass fiber reinforced composite material, in an irregular shell shape, with an irregular hollow area in the middle. The hollow area is used to form an independent closed space, which can be used to install important mission payloads or functional components, such as optoelectronic pods, reconnaissance equipment, etc.

[0003] In order to ensure the structural strength and rigidity of the skin part, metal reinforcements are usually embedded inside the edge of the hollow area. The bottom surface of the edge of the hollow area of ​​the skin part 01 needs to fit tightly with the upper surface of the cabin frame, and its edge wall 04 and the inner side surface 05 of the cabin frame are in the same vertical plane. The design of this connection structure must not only ensure the structural integrity during flight, but also ensure the sealing performance in various harsh environments. Due to the large connection area and complex shape, the reasonable distribution of the connection points directly affects the reliability of the overall structure. In engineering practice, it is necessary to conduct mechanical property tests on the skin part to verify its overall strength characteristics, especially to evaluate the rationality of the edge connection structure of the hollow area, that is, whether the deformation and dislocation of each connection point are uniform and within the allowable range under the preset tension. In addition, with the improvement and upgrade of the UAV model or the structural adjustment, the design parameters of the skin part 01, such as the location, number, and skin thickness of the connection points, also need to be adjusted accordingly. This requires that the performance test of the skin part 01 has good repeatability so that the optimal design solution can be obtained through multiple tests and adjustments.

[0004] For newly developed UAV skin parts, the design of their connection structure needs to go through repeated testing and optimization processes. On the one hand, it is necessary to ensure that the deformation of each connection point meets the requirements under the preset tension; on the other hand, the number of connection points should be reduced as much as possible. This is because each connection point requires a mounting hole to be opened on the skin part and a connector to be set, which will not only affect the reliability of the connector due to harsh environments such as high altitude, low pressure, high humidity, and high cold, but also due to the discontinuity of the material, it will also destroy the overall structural strength of the skin part to a certain extent. Therefore, it is particularly important to optimize the number and position arrangement of the connection points while meeting the strength and stiffness requirements.

[0005] The currently commonly used testing method is to measure the deformation of key points with multiple dial gauges 02 while applying tension to the skin parts, with reference to Figure 3 . This method has the following defects: First, due to the limited number of measuring points, it is difficult to comprehensively reflect the stress distribution in the connection area; second, the installation and debugging process of the dial gauges is cumbersome, and the testing efficiency is low; third, the measurement results are easily affected by external vibrations and temperature changes, and the reliability is not high; finally, for the optimization tests that need to be carried out repeatedly, this method is complex to operate and it is difficult to ensure the consistency of the test conditions. These problems are particularly prominent in the process of improving the UAV model and optimizing the structure, seriously affecting the efficiency and accuracy of the design optimization. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies of the prior art. The present invention provides a detection device for testing the stress distribution of the connection points of the UAV skin parts. Through the cooperation of the support frame and the adjustable loading mechanism with a three-layer composite structure and a temperature-sensitive detection tape structure, it realizes the phased precise detection of the stress distribution of the connection points and the visual detection of the sealing performance. It has the characteristics of simple structure, convenient operation, sensitive detection, intuitive results and reusable, providing reliable technical support for the optimized design of the UAV skin part connection structure.

[0007] To solve the above problems, the present invention adopts the following scheme: A detection device for testing the stress distribution of the connection points of the UAV skin parts, comprising:

[0008] A support frame; a skeleton simulation part, the bottom surface of which is fixedly connected to the support frame, and the upper surface of which is evenly provided with closely arranged screw holes along the circumference; a pulley group, including multiple groups of pulleys, fixed on the support frame and located above the skeleton simulation part; a rope belt assembly, including multiple rope belts, each rope belt is sequentially wound around the corresponding pulley group; a counterweight module, including multiple adjustable counterweights; a deformation detection structure, arranged between the inner side surface of the skeleton simulation part and the wall along the hollow area of the skin part to be tested;

[0009] The deformation detection structure includes: A first three-layer composite structure for primary detection, including: a first adhesive layer fixedly bonded to the skin part; a second adhesive layer fixedly bonded to the skeleton simulation part; a first deformation detection adhesive layer arranged between the first adhesive layer and the second adhesive layer, remaining intact within a preset deformation range, and being cut into strip-shaped independent detection segments one with a preset width.

[0010] The beneficial effect of this technical solution is: A stable and reliable test platform is realized through the cooperation of the support frame and the skeleton simulation part. The setting of the pulley group and the rope belt assembly makes the tension application more flexible and precise. The three-layer composite detection structure can intuitively display the deformation situation, facilitating the judgment of the rationality of the connection point distribution.

[0011] Preferably, the pulley block includes: a fixing frame, which is fixed to the support frame through an adjustable bolt assembly, and the front, rear, left, and right positions of the fixing frame in the horizontal plane are adjustable. The beneficial effect of this technical solution is that the fixing frame of the pulley block can adjust its position in the horizontal plane, improving the flexibility of the tension application direction, enabling the test device to adapt to skin parts of different sizes and shapes, and achieving more accurate test control.

[0012] Preferably, each rope belt in the rope belt assembly includes: a flexible steel wire rope; a tension transmission component, including: a connecting seat, which is fixed to the upper surface of the skin part by bolts; a circular ring, which is arranged on the upper surface of the connecting seat; a rotating ring, one end of which is movably connected to the circular ring to form a universal joint, and the other end is provided with a clamping structure for clamping the steel wire rope. The beneficial effect of this technical solution is that the use of a flexible steel wire rope improves the stability of tension transmission, and the universal joint structure realizes the all-round adaptive adjustment of the tension direction, ensuring that the rope belt is always in an ideal stress state during the test, and improving the accuracy and reliability of the test.

[0013] Preferably, the deformation detection structure further includes: a second three-layer composite structure for re-detection, including: a third glue layer and a fourth glue layer, which use the same materials as the first three-layer composite structure; a second deformation detection glue layer, which remains intact within a deformation range of 0.8 - 1%, and is cut into strip-shaped independent detection segments two with a width of 2 - 4 mm. The beneficial effect of this technical solution is that the second three-layer composite structure provides higher detection sensitivity, and the finer detection segment width improves the detection accuracy, which is suitable for the precise detection requirements after the connection structure is optimized, making the test results more accurate and reliable.

[0014] A detection device for testing the stress distribution of the connection points of an unmanned aerial vehicle skin part, including: a support frame; a skeleton simulation part, the bottom surface of which is fixedly connected to the support frame, and the upper surface of which is evenly provided with closely arranged screw holes along the circumference, and the screw holes are used for fitting and fixedly connecting with the connection holes of the skin part; a pulley block, including multiple groups of pulleys, each group of pulleys is fixed to the support frame and located above the skeleton simulation part, and the height of the pulley is adjustable; a rope belt assembly, including multiple rope belts, each rope belt is sequentially wound around the corresponding pulley in the pulley block, one end of each rope belt is fixedly connected to a tension transmission component arranged on the upper surface of the skin part, and the other end is a suspension end; a counterweight module, including multiple adjustable counterweights, each counterweight is respectively suspended at the suspension end of each rope belt; and a deformation detection structure, which is arranged between the inner side surface of the skeleton simulation part and the wall along the hollow area of the skin part;

[0015] The deformation detection structure includes a detection tape structure. The detection tape structure includes a flexible frame and a plurality of independent detection monomers arranged in the flexible frame. The detection monomers are evenly arranged at a predetermined interval through the flexible frame. Each detection monomer includes an upper section, a middle section, and a lower section. The upper section and the lower section are made of a high-strength adhesive material, and the middle section is made of a paper material with a preset breaking strength. The upper section is used to tightly bond with the inner wall of the hollow area of the skin part, and the lower section is used to tightly bond with the inner side surface of the skeleton simulation part. The beneficial effect of this technical solution is that the detection tape structure is innovatively used for stress distribution detection. The flexible frame ensures the uniform distribution of the detection monomers. The three-section design of the detection monomers ensures reliable bonding and detection effects, realizing a more simple and practical detection method.

[0016] Preferably, the predetermined interval of the detection monomers is 3 - 4 mm. The beneficial effect of this technical solution is that the specified predetermined interval of 3 - 4 mm ensures the continuity of detection, provides an appropriate spatial resolution, facilitates the observation and recording of detection results, and provides standardized technical parameters for the test process.

[0017] Preferably, the fracture deformation amount of the middle section is 1.0 - 1.2% under dry conditions. The beneficial effect of this technical solution is that the range of the fracture deformation amount under dry conditions is clearly specified, providing a standardized detection reference value, facilitating the judgment of the performance of the connection structure, and making the test results comparable and repeatable.

[0018] Preferably, the fracture deformation amount of the middle section after wetting treatment is 0.5 - 0.8%. The beneficial effect of this technical solution is that the detection sensitivity is improved through wetting treatment, expanding the application range of the detection device, meeting the detection requirements with different precision requirements, and enhancing the adaptability and flexibility of the detection method.

[0019] Preferably, it further includes a air supply device that blows hot air from the peripheral joint of the skin part and the skeleton simulation part to the center; the middle section of the detection monomer is made of a temperature-sensitive material, and this temperature-sensitive material can present different colors according to temperature changes and has reversibility. The beneficial effect of this technical solution is that the hot air detection method is innovatively introduced, and the temperature-sensitive material provides a new detection means, realizing the visual detection of the sealing performance and improving the intuitiveness and convenience of detection.

[0020] Preferably, the temperature-sensitive material appears light blue at room temperature. When the local temperature rises, the color gradually deepens to dark blue and can return to its original color after the temperature drops. Its response time to temperature is 2-3 seconds. The beneficial effects of this technical solution are as follows: specific color change characteristics and fast response time are specified. The reversibility ensures the repeated use of the detection material, significantly improves the detection efficiency and economy, and realizes a more intelligent and environmentally friendly detection method.

[0021] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0022] In terms of structural design: a combined structure of a support frame, a skeleton simulation component, a pulley group, and a rope and belt assembly is adopted, and an adjustable counterweight module is used to realize a stable and reliable test platform. It not only ensures the accuracy and uniformity of tension application but also can flexibly adjust test parameters according to the skins of different sizes and shapes, improving the adaptability and versatility of the device.

[0023] In terms of detection means: two detection schemes, namely a three-layer composite structure and a detection tape structure, are innovatively designed. The former realizes staged detection through deformation detection glue layers with different sensitivities, and the latter adopts a temperature-sensitive material combined with a hot air detection method to realize visual detection. It not only meets the test requirements at different stages but also provides intuitive and reliable detection results, significantly improving the detection efficiency and accuracy.

[0024] In terms of practicality: the equipment is easy to operate, the detection results are intuitive and reliable, and the detection material can be reused, which not only reduces the test cost but also improves the detection efficiency. Through standardized technical parameters and detection processes, the comparability and repeatability of test results are ensured, providing reliable technical support for the optimized design of the connection structure of the UAV skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a structural diagram of the skin from an oblique top-down view;

[0027] Figure 2 It is a structural diagram of the skin from an oblique side view;

[0028] Figure 3 It is a schematic diagram of using a micrometer for measurement in the prior art;

[0029] Figure 4 is Figure 3 The partial enlarged view at position A in it shows the specific measurement position of the micrometer;

[0030] Figure 5 is the overall structural schematic diagram of the embodiment of the present invention;

[0031] Figure 6 is the structural schematic diagram of the skeleton simulation part;

[0032] Figure 7 is the cross-sectional schematic diagram of the first three-layer composite structure in Embodiment 1;

[0033] Figure 8 is the cross-sectional schematic diagram of the second three-layer composite structure in Embodiment 1;

[0034] Figure 9 is the structural schematic diagram of the detection tape structure in Embodiment 2;

[0035] Figure 10 is the state schematic diagram after the detection tape structure in Embodiment 2 is installed and the flexible frame is torn off;

[0036] Figure 11 is Figure 5 The partial enlarged view at position B in it shows the connection structure of the rope assembly..

[0037] Reference numerals:

[0038] Main body structure: support frame 20 / skeleton simulation part 10 / skin part 01 / screw hole 03 / hollow area along the wall 04 / inner side 05;

[0039] Loading part: pulley group 30 / fixing frame 31 / rope assembly 40 / flexible steel wire rope 41 / connecting seat 42 / ring 43 / rotating ring 44 / counterweight module 50;

[0040] Detection structure: deformation detection structure 60 / first three-layer composite structure 61 / first adhesive layer 611 / second adhesive layer 612 / first deformation detection adhesive layer 613 / bar-shaped independent detection section 1 06 / second three-layer composite structure 62 / third adhesive layer 621 / fourth adhesive layer 622 / second deformation detection adhesive layer 623 / bar-shaped independent detection section 2 07; detection tape structure 63 / flexible frame 631 / detection monomer 632 / upper section 632a / middle section 632b / lower section 632c. Detailed implementation manners

[0041] The following will be combined with Figures 1-11A preferred embodiment of the present invention will be described in detail. It should be noted that the following description is only a preferred embodiment of the present invention and does not limit the present invention. Those skilled in the art should understand that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to the appended claims.

[0042] Embodiment 1:

[0043] The present invention provides a detection device for testing the stress distribution of connection points of an unmanned aerial vehicle skin part. As Figures 4-5 shown, the detection device includes:

[0044] A support frame 20;

[0045] A skeleton simulation part 10, whose structure simulates the cabin skeleton, whose bottom surface is fixedly connected to the support frame 20, and whose upper surface is evenly provided with closely arranged screw holes 03 along the circumferential direction. The screw holes 03 are used for fixedly connecting with the connection holes of the skin part 01. By selecting screw holes 03 at different positions to connect with the skin part 01, it is convenient to adjust the number and distribution positions of the connection points;

[0046] A pulley group 30, which includes multiple groups of pulleys. Each group of pulleys is fixed on the support frame 20 according to the requirements of the tension transmission path. Each group of pulleys is located above the skeleton simulation part 10 and the height is adjustable, and is used to apply a stable tension on the upper surface of the skin part 01; Among them, referring to Figure 5 shown, the pulley group 30 includes: a fixing frame 31, which is fixed on the support frame 20 through an adjustable bolt assembly. Further, the adjustable bolt assembly is provided with an adjustment groove. By adjusting the position of the bolt in the adjustment groove, the position of the fixing frame 31 in the four directions of front, back, left, and right in the horizontal plane can be adjusted, and it is locked and fixed by a nut. The adjustable structure design of this pulley group 30 enables the application position, direction, and magnitude of the tension to be flexibly adjusted according to the test requirements, so as to more accurately simulate the tension distribution state of the skin part 01 under actual working conditions;

[0047] A rope belt assembly 40, which includes multiple rope belts. Each rope belt is sequentially wound around the corresponding pulley group in the pulley group 30. One end of each rope belt is fixedly connected to the tension transmission component arranged on the upper surface of the skin part 01, and the other end is a suspension end, which is used to suspend a counterweight block; Among them, referring to Figure 5 and Figure 11As shown, each cord is made of a flexible steel wire rope 41, which has sufficient strength and flexibility; the tension transmission component includes: a connecting seat 42, which is fixed to a preset position on the upper surface of the skin part 01 by bolts, and a circular ring 43 for adjusting the tension direction is provided on the upper surface of the connecting seat 42; a rotating ring 44, one end of which is movably connected to the circular ring 43 to form a universal joint, and the other end is provided with a clamping structure for clamping and fixing the steel wire rope 41; through the cooperation of the circular ring 43 and the rotating ring 44, the tension transmission structure realizes the all-round adaptive adjustment of the tension direction, ensuring that the steel wire rope 41 is always in a tensioned state during the test;

[0048] A weight module 50, including a plurality of adjustable weights, each weight is respectively suspended at the suspension end of each cord, for applying a preset constant tension;

[0049] And: a deformation detection structure 60, which is arranged between the inner side surface 05 of the skeleton simulation part 10 and the wall 04 along the hollow area of the skin part 01.

[0050] The deformation detection structure 60 adopts different structural forms according to different detection stages:

[0051] A. In the initial detection stage of the skin part 01, since the number of connection points is relatively small and a large range of deformation and / or misalignment needs to be detected, at this time, the deformation detection structure 60 adopts the first three-layer composite structure 61;

[0052] B. In the re-detection and multiple detection stages after adding connection points according to the initial detection results, since the local stress is reduced due to the increase of connection points and the detection sensitivity needs to be improved, at this time, the deformation detection structure 60 can select the second three-layer composite structure 62.

[0053] Specifically, the first three-layer composite structure 61, referring to Figure 7 , includes: a first adhesive layer 611 fixedly bonded to the wall 04 along the hollow area of the skin part 01, a second adhesive layer 612 fixedly bonded to the inner side surface 05 of the skeleton simulation part 10, and a first deformation detection adhesive layer 613 bonded between the first adhesive layer 611 and the second adhesive layer 612; wherein, both the first adhesive layer 611 and the second adhesive layer 612 are made of high-strength epoxy resin structural adhesive, and their tensile strength and tensile modulus are selected according to design requirements, and the elongation at break is less than 2% to ensure a firm connection with the base material; the first deformation detection adhesive layer 613 adopts a modified epoxy system, and its material formula is specially formulated so that it, for example, maintains the structural integrity within the deformation range of 1.5 - 2%, breaks when exceeding this range, and the first deformation detection adhesive layer 613 is vertically cut into strip-shaped independent detection segments 06 with a width of 3 - 5 mm and a spacing of 2 - 3 mm along the hollow edge by a blade or other cutting tools in a partially cured state, and each detection segment is evenly arranged.

[0054] Specifically, for the second three-layer composite structure 62, referring to Figure 8 , it includes: a third adhesive layer 621 fixedly bonded to the wall 04 along the hollow area of the skin part 01, a fourth adhesive layer 622 fixedly bonded to the inner side surface 05 of the skeleton simulation part 10, and a second deformation detection adhesive layer 623 bonded between the third adhesive layer 621 and the fourth adhesive layer 622; wherein, the third adhesive layer 621 and the fourth adhesive layer 622 adopt the same high-strength epoxy resin structural adhesive as the first three-layer composite structure 61 to maintain the comparability of test data; the second deformation detection adhesive layer 623 adopts a modified epoxy system, but its material formula is adjusted compared with the first deformation detection adhesive layer 613 to make it have higher sensitivity, that is, for example, it remains structurally intact within the deformation range of 0.8 - 1%, and breaks when exceeding this range, and the second deformation detection adhesive layer 623 is vertically cut into strip-shaped independent detection segments two 07 with a width of 2 - 4 mm and a spacing of 2 - 3 mm along the hollow edge by a blade or other cutting tools in a partially cured state, and each detection segment is evenly arranged.

[0055] In the specific detection process, first, the wall 04 along the hollow area of the skin part 01 and the inner side surface 05 of the skeleton simulation part 10 are polished and cleaned to ensure that the surface is free of oil stains. During the initial detection, a small number of screw holes 03 are selected to be connected and fixed to the skin part 01, and the first three-layer composite structure 61 is set between the connection surfaces. After the first three-layer composite structure 61 is completely cured, a preset stable tension is applied to the skin part 01 through the rope and belt assembly 40 and the weight module 50, and the fracture situation of each detection segment one 06 is observed.

[0056] When a detection segment one 06 at a certain place breaks, it indicates that the deformation amount in this area has exceeded the allowable range of 1.5 - 2%, and connection points need to be added near this area. After determining the positions where connection points need to be added according to the initial detection results, new connection bolts are replaced and the second three-layer composite structure 62 is arranged for re-detection. Since the second deformation detection adhesive layer 623 has higher sensitivity and can break when the deformation amount reaches 0.8 - 1%, the rationality of the connection structure can be evaluated more precisely.

[0057] During the detection process, the tension size can be adjusted by adjusting the weights of the weight blocks in the weight module 50, so as to simulate the tension distribution under different working conditions. The fracture situation of each detection segment can be recorded by means of photography or video, etc., which is convenient for subsequent analysis and comparison. The detection and optimization are repeated until all the detection segments two 07 remain intact under the preset tension, indicating that the connection structure meets the design requirements.

[0058] Embodiment 2:

[0059] This embodiment provides a scheme for stress distribution detection using a special detection tape structure 63. AsFigure 9 As shown, the special detection tape structure 63 includes a flexible frame 631 and a plurality of independent detection monomers 632 disposed within the frame 631. Each detection monomer 632 is composed of an upper segment 632a, a middle segment 632b, and a lower segment 632c. The upper segment 632a and the lower segment 632c are made of a high-strength adhesive material, and the middle segment 632b is made of a special paper material with a preset breaking strength. The detection monomers 632 are evenly arranged at a predetermined spacing (such as 3 - 4 mm) through the flexible frame 631.

[0060] During use, first, surface treatment is performed on the inner side 05 of the wall 04 and the skeleton simulation member 10 along the hollowed-out area of the skin member 01. Then, the detection tape structure 63 is circumferentially adhered along the connection surface, such that the upper segment 632a of the detection monomer 632 is tightly adhered to the inner side of the wall 04 of the hollowed-out area of the skin member 01, and the lower segment 632c is tightly adhered to the inner side 05 of the skeleton simulation member 10. After the adhesion is stable, carefully tear off the flexible frame 631, leaving the evenly arranged detection monomers 632.

[0061] The characteristics of this detection tape structure 63 are as follows: The middle segment 632b of the detection monomer 632 is made of a paper material with a specific formulation, and its fracture characteristics have a good correspondence with the deformation amount. Under standard conditions (dry conditions), the fracture deformation amount of the middle segment 632b is set within the range of 1.0 - 1.2%. When it is necessary to improve the detection sensitivity, a spraying device can be used to moderately moisten the middle segment 632b of the detection monomer 632, and the degree of moistening can be adjusted according to the detection requirements. By controlling the wetting parameters, the fracture strain range of the middle segment 632b can be reduced from 1.0 - 1.2% in the dry state to 0.5 - 0.8% in the moistened state.

[0062] During the detection process, a preset tension is applied to the skin member 01 through the rope and belt assembly 40 and the counterweight module 50. When the local deformation amount exceeds the preset range, the detection monomer 632 at the corresponding position will break at the middle segment 632b. By observing the position and quantity of the breaks, the stress distribution of the connection structure can be visually judged. This detection method has the following characteristics:

[0063] 1. Simple manufacturing process and low cost:

[0064] The detection tape can be mass-produced. Ordinary industrial paper is selected as the material and is specially treated; it is convenient to replace and suitable for multiple repeated tests.

[0065] 2. Adjustable detection sensitivity:

[0066] The sensitivity can be continuously adjusted by regulating the degree of moistening of the middle segment 632b; it is applicable to the detection requirements at different stages; the detection parameters can be quickly adjusted according to actual needs.

[0067] 3. Intuitive and reliable results: The fracture position is clearly visible, not affected by environmental vibration, and is easy to record and analyze.

[0068] 4. Convenient operation: Integral design, easy to install and disassemble; no special tools and equipment are required; the detection process is simple and intuitive.

[0069] The detection method of this embodiment is particularly applicable to the later stage of the connection structure optimization. By adjusting the humidity of the middle section 632b, precise detection of the fine stress distribution can be achieved, providing a reliable basis for obtaining the optimal connection scheme.

[0070] Embodiment 3:

[0071] This embodiment provides a sealing performance detection scheme. After completing the connection structure optimization of Embodiment 2, a gasket is provided between the connection surface of the skin part 01 and the skeleton simulation part 10. At this time, it is necessary to evaluate the sealing performance of the connection structure under the action of tension.

[0072] This embodiment uses an improved detection tape structure 63 for detection. In addition to maintaining the basic structure of Embodiment 2, the middle section 632b of the detection monomer 632 of this detection tape structure 63 is specially improved: it is made of a temperature-sensitive material, which shows light blue at room temperature, and when the local temperature rises, the color gradually deepens to dark blue. This temperature-sensitive material has good reversibility and can return to its original color when the temperature drops.

[0073] The detection steps are as follows:

[0074] 1. Pretreatment:

[0075] Clean the exposed edge area of the gasket;

[0076] Paste the detection tape structure 63 circumferentially along the sealing line, and the detection monomers 632 are evenly distributed;

[0077] Carefully tear off the flexible frame 631, and retain the evenly arranged detection monomers 632.

[0078] 2. Loading:

[0079] Apply a preset stable tension to the skin part 01 through the rope and belt assembly 40 and the counterweight module 50;

[0080] Use a photographic or video device to record the initial state.

[0081] 3. Hot air detection:

[0082] Slowly blow warm air from the joint of the periphery of the skeleton simulation part 10 and the skin part 01 towards the center;

[0083] Keep the air temperature at about 40°C to ensure the detection sensitivity;

[0084] The entire detection process is recorded by a camera device.

[0085] When there are minute gaps in the connection structure, hot air will leak through the gaps, causing an obvious color change in the middle section 632b of the local detection monomer 632. This color change has the following characteristics: 1. Quick response: The color change can be observed within 2 - 3 seconds when the temperature rises; 2. Accurate positioning: The color change only appears on the detection monomers near the leakage position; 3. Reusable: After the detection is completed, the color automatically returns as the temperature drops.

[0086] By analyzing the video recording, the following information can be obtained: 1. The specific distribution of the leakage positions; 2. The chronological order of the color changes, reflecting the severity of the leakage; 3. The expanding trend of the leakage range.

[0087] This detection method has the advantages of simple operation, low cost, and intuitive results, and is particularly suitable for the rapid detection and optimization of connection structures. According to the detection results, the distribution of connection points can be adjusted or gaskets can be replaced specifically until the design requirements are met.

[0088] It should be noted that the materials used for each adhesive layer in the text are just one of them. Those skilled in the art can, according to the actual application requirements, select other material systems with similar mechanical properties, such as other types of modified epoxy resins, modified acrylate adhesives, etc., as long as they can meet the corresponding deformation detection requirements.

[0089] Although the present invention has been disclosed in connection with certain embodiments shown and described in detail, those skilled in the art who benefit from the disclosure herein will readily understand various modifications and improvements thereto. Therefore, the spirit and scope of the present invention will not be limited by the foregoing examples, but will be understood in the broadest sense permitted by law.

Claims

1. A detection device for testing stress distribution at connection points of UAV skin components, characterized in that: include: A support frame (20); a skeleton simulation component (10), the bottom surface of which is fixedly connected to the support frame (20), and the upper surface of which is evenly and circumferentially provided with closely arranged screw holes (03); a pulley block (30), comprising a plurality of pulleys, fixed to the support frame (20) and located above the skeleton simulation component (10); a rope assembly (40), comprising a plurality of ropes, each rope being sequentially wound around a corresponding pulley block; a counterweight module (50), comprising a plurality of adjustable counterweight blocks; a deformation detection structure (60), arranged between a wall (04) along a hollow area of ​​a skin component (01) to be tested and an inner side surface (05) of the skeleton simulation component (10); The deformation detection structure (60) comprises: a first three-layer composite structure (61) for initial detection, comprising: a first adhesive layer (611) fixedly bonded to the skin component (01); a second adhesive layer (612) fixedly bonded to the skeleton simulation component (10); a first deformation detection adhesive layer (613) disposed between the first adhesive layer and the second adhesive layer, remaining intact within a preset deformation range, and being cut into a strip-shaped independent detection segment (06) of a preset width; The deformation detection structure (60) further comprises: a second three-layer composite structure (62) for further detection, comprising: The third adhesive layer (621) and the fourth adhesive layer (622) are made of the same material as the first three-layer composite structure; The second deformation detection adhesive layer (623) remains intact within the deformation range of 0.8-1%, and is cut into strip-shaped independent detection segments 2 (07) with a width of 2-4 mm.

2. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 1 is characterized in that: The pulley block (30) comprises: a fixing frame (31) fixed to the supporting frame (20) via an adjustable bolt assembly, and the front, rear, left and right positions of the fixing frame (31) in a horizontal plane are adjustable.

3. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 1 is characterized in that: Each rope in the rope assembly (40) comprises: Flexible steel wire rope (41); Tension transmission components, including: A connecting seat (42) fixed to the upper surface of the skin member (01) by means of bolts; A circular ring (43) is arranged on the upper surface of the connecting seat (42); A rotating ring (44) has one end movably connected to the circular ring (43) to form a universal joint, and the other end is provided with a clamping structure for clamping the steel wire rope (41).

4. A detection device for testing stress distribution at connection points of UAV skin components, characterized in that: include: A support frame (20); a skeleton simulation part (10), the bottom surface of which is fixedly connected to the support frame (20), and the upper surface of which is evenly and circumferentially provided with closely arranged screw holes (03), the screw holes (03) being used to cooperate and be fixedly connected with the connecting holes of the skin part (01); a pulley block (30), comprising a plurality of pulley groups, each pulley group being fixed on the support frame (20) and located above the skeleton simulation part (10), and the height of the pulleys being adjustable; a rope belt assembly (40), comprising a plurality of rope belts, each rope belt being sequentially wound around a corresponding pulley group in the pulley block (30), one end of each rope belt being fixedly connected to a tension transmission component arranged on the upper surface of the skin part (01), and the other end being a hanging end; a counterweight module (50), comprising a plurality of adjustable counterweight blocks, each counterweight block being respectively hung at the hanging end of each of the rope belts; and a deformation detection structure (60) disposed between the hollow area along the wall (04) of the skin component (01) and the inner side surface (05) of the skeleton simulation component (10); The deformation detection structure (60) comprises a detection tape structure (63), wherein the detection tape structure (63) comprises a flexible frame (631) and a plurality of independent detection units (632) arranged in the flexible frame (631), wherein the detection units (632) are arranged uniformly at a predetermined interval through the flexible frame (631), wherein each detection unit (632) comprises an upper section (632a), a middle section (632b) and a lower section (632c), wherein the upper section (632a) and the lower section (632c) are made of a high-strength adhesive material, and the middle section (632b) is made of a paper material with a preset breaking strength, wherein the upper section (632a) is used to be tightly bonded to the hollow area of ​​the skin component (01) along the wall (04), and the lower section (632c) is used to be tightly bonded to the inner side surface (05) of the skeleton simulation component (10); It also includes an air supply device for blowing hot air from the peripheral joint of the skin part (01) and the skeleton simulation part (10) to the center; The middle section (632b) of the detection unit (632) is made of a temperature-sensitive material, which can present different colors according to temperature changes and is reversible.

5. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 4 is characterized in that: The predetermined spacing between the detection units is 3-4 mm.

6. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 4 is characterized in that: The fracture deformation of the middle section is 1.0-1.2% under dry conditions.

7. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 6 is characterized in that: The fracture deformation of the middle section after the wetting treatment is 0.5-0.8%.

8. The detection device for testing stress distribution of connection points of UAV skin components according to claim 7, characterized in that: The temperature sensitive material is light blue at room temperature, and its color gradually deepens to dark blue when the local temperature rises. It can restore its original color after the temperature drops, and its response time to temperature is 2-3 seconds.

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