A horizontal measurement device and method for unmanned aerial vehicles

Abstract

The application relates to the field of unmanned aerial vehicle detection, and particularly discloses an unmanned aerial vehicle horizontal measurement device and a measurement method, which comprises a measurement platform and a support assembly, the support assembly comprises a front end support arranged at the front end of the measurement platform and a rear end support arranged at the opposite rear end, and is fixed with the nose and tail of the unmanned aerial vehicle through screw holes, and the central axis of the fixed unmanned aerial vehicle is parallel to the horizontal line; the support assembly is arranged on the measurement platform and comprises a first support and a second support, and the highest horizontal heights of the first support and the second support are the same; the rear end support comprises a tail wing support matched with the shape of the tail wing of the unmanned aerial vehicle, the tail wing support comprises symmetrically-arranged tail wing positioning plates, and tail wing measurement holes are arranged in the tail wing positioning plates; the measurement device establishes a unified, accurate and reliable physical reference for unmanned aerial vehicle horizontal measurement, ensures that the central axis of the unmanned aerial vehicle is strictly parallel to the horizontal line during measurement, and eliminates measurement errors caused by inaccurate initial reference.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) inspection technology, and in particular to a UAV level measurement device and measurement method. Background Technology

[0002] Before leaving the factory, fixed-wing drones undergo a crucial inspection to ensure their flight performance and safety: horizontal measurement. This measurement primarily confirms the positional relationships between the drone's components and the fuselage, the relative positions of the components, and the individual positional states of each component to ensure they meet design requirements and assembly accuracy. This is essential for ensuring the aircraft's flight stability and maneuverability. Current production of small and medium-sized drones still widely employs conventional methods based on industry standards (HB8733-2023), relying mainly on basic tools such as levels and theodolites. This requires the purchase of specific measurement platforms and tools. Traditional platforms and supports are mostly fixed structures, unable to flexibly adapt to different models and sizes of drones, and suffer from unreliable positioning and fixation issues, especially with the tail fin, which has a complex shape and is difficult to stabilize. Existing methods lack effective positioning mechanisms, making the drone prone to movement or shaking during measurement, resulting in poor measurement repeatability and reduced data reliability. Summary of the Invention

[0003] This application discloses a drone level measurement device and method to solve the technical problem of inaccurate and unreliable positioning in existing drone level measurement devices and methods in related technologies.

[0004] To solve the above problems, the present invention adopts the following technical solution: This invention provides a drone horizontal measurement device for measuring the horizontal position of a fixed-wing drone. The device includes: a measurement platform with multiple parallel mounting slots; a support assembly comprising a front support at the front end of the measurement platform and a rear support at the rear end, fixed to the drone's nose and tail respectively via screw holes, with the drone's central axis parallel to the horizontal line after fixing; and a support assembly on the measurement platform, including a first support and a second support, the first and second supports having the same maximum horizontal height. The rear support includes a tail wing support matching the shape of the drone's tail wing, the tail wing support including symmetrically arranged tail wing positioning plates with tail wing measurement holes.

[0005] Preferably, the front support includes a lower support and a front support. The lower support is fixed on the mounting groove, and the lower support has a plurality of mounting holes along the axial direction of the UAV. Depending on the size of the UAV, the front support and the first support member are detachably mounted on the mounting holes.

[0006] Preferably, the front bracket has an L-shaped structure, including a mounting part and a fixing part. When the front bracket is installed on the lower bracket, the fixing part is connected and fixed to the lower bracket, and the mounting part is perpendicular to the plane of the lower bracket and fixed to the nose of the drone.

[0007] Preferably, a shim can be detachably installed at the rear end of the measuring platform, and the rear end bracket is fixed on the shim.

[0008] Preferably, the tail fin support is provided with positioning holes corresponding to the UAV.

[0009] Preferably, the measuring platform is equipped with leveling knobs around its bottom, and a level is provided on the surface of the measuring platform.

[0010] This invention also provides a method for horizontal measurement of a UAV, using the UAV horizontal measurement device described above, comprising the following steps: S1, using a scribing fixture to scribble and mark points on the nose, tail, wings, and tail fin of the unassembled UAV; S2, assembling the UAV components after scribing and marking, building the UAV horizontal measurement device, and leveling the measurement platform using a leveling knob and a level; S3, moving the UAV onto a support assembly, fixing the nose and front support accordingly, and fixing the tail and tail fin support accordingly, then removing the support assembly; S4, measuring the points on the fuselage and wings using a height gauge and recording them as Z values; measuring the points on the tail fin using a depth gauge through the tail fin positioning hole on the tail fin positioning plate and recording them as Z' values; using the reserved hole on the top of the UAV's front cabin as a base point, measuring the distance of symmetrical points on the wings and tail fin by stringing a line; S5, statistically analyzing the Z values, Z' values, and string distance values, calculating their horizontal measurement tolerance, and verifying whether the parameters of the UAV fuselage meet the standards.

[0011] Preferably, the diameter of the point on the drone body is 1mm-2mm, and the allowable drilling depth is 0.5mm-0.8mm.

[0012] Preferably, the marker point located on one side of the drone's fuselage axis is defined as the left marker point, and the marker point located on the opposite side of the drone's fuselage axis is defined as the right marker point, with the left marker point and the right marker point being symmetrically arranged about the drone's fuselage axis.

[0013] Preferably, step S4 further includes the following steps: S40, inserting the matching threading pin into the reserved hole on the top of the front cabin plate and fixing it with a nut; pressing one end of the measuring line with the threading pin, pulling the other end to the point to be measured and marking it, and measuring the length of the line with a tape measure.

[0014] The technical solution adopted in this invention can achieve the following beneficial effects: 1. This invention provides a drone horizontal measurement device with multiple parallel mounting slots on its measurement platform. The bracket assembly can be installed in the corresponding mounting slots according to different drone models and sizes, improving the device's versatility. The bracket assembly, as the core component for positioning the drone before horizontal measurement, has a front bracket at the front end of the measurement platform and a rear bracket at the rear end, respectively used to fix the nose and tail of the drone to be measured. The bracket design requires that the central axis of the fixed drone is parallel to the horizontal line. The measurement device also includes a support assembly, set on the measurement platform, including a first support member and a second support member. During the installation of the bracket assembly, these support members respectively support the front and rear halves of the drone. The first and second support members... The support components have the same maximum horizontal height, facilitating the mounting of the drone on the bracket assembly and ensuring the drone's horizontal position. The rear bracket includes a tail fin bracket that matches the shape of the drone's tail fin. The tail fin bracket includes symmetrically arranged tail fin positioning plates with tail fin measurement holes. The V-shaped tail fin is reliably fixed under the constraint of the tail fin positioning plates. The tail fin measurement holes on the positioning plates facilitate direct measurement of relevant markers on the tail fin, improving the measurement accuracy of tail fin structural parameters. It is less susceptible to external influences and has good measurement repeatability. This measurement device establishes a unified, accurate, and reliable physical benchmark for the horizontal measurement of the drone, ensuring that the drone's central axis is strictly parallel to the horizontal line during measurement, fundamentally eliminating measurement errors caused by inaccurate initial benchmarks.

[0015] 2. The structure of "multiple mounting holes on the lower bracket" and "detachable installation of the front bracket and the first support" improves the size adaptability and versatility of the device. Operators can flexibly adjust the installation position of the front bracket and the support according to the specific size of different drone models, so that one set of devices can meet the measurement needs of various drones, greatly improving the utilization rate of the equipment and reducing the cost of purchasing multiple sets of special tooling.

[0016] 3. The detachable shim enhances the adaptability of the rear end. For drone models with a large tail structure or a high vertical tail, the installation height of the rear end bracket can be raised by adding the shim, thereby ensuring that the drone body is always in a measurement posture with the central axis parallel to the horizontal line after placement, further expanding the applicability and measurement accuracy of the device.

[0017] 4. Positioning holes corresponding to the UAV are set on the tail fin support, which realizes precise positioning and quick fixation of the tail fin. The positioning holes cooperate with the specific structure on the UAV tail fin to play a role in coarse positioning and error prevention, ensuring that the UAV is in the same position every time it is placed on the device, reducing adjustment time and improving measurement efficiency and data consistency.

[0018] 5. By setting up a leveling knob and a level, the measuring platform can be quickly and accurately leveled. Operators can easily ensure the initial levelness of the entire measuring platform by observing the level and rotating the leveling knob. This is the fundamental prerequisite for ensuring the accuracy of all subsequent measurement data. This design simplifies the leveling process, reduces dependence on the operating environment, and improves the independence and ease of operation of the device.

[0019] 6. The present invention also provides a method for measuring the level of a UAV, which ensures the reliability of UAV level measurement by specifying specific measurement points on the UAV and using a measurement device that keeps the UAV strictly level, and has the same beneficial effects as the aforementioned UAV level measurement device.

[0020] 7. By defining the "point diameter" and "allowable drilling depth," and standardizing the marking operation, measurement accuracy is ensured. This quantitative standard avoids measurement errors caused by points that are too large or too deep when marking points, ensuring that the measuring tool can accurately position the point at the same location every time, thereby obtaining more accurate and stable data.

[0021] 8. Ensuring strict symmetry of the marked points provides a clear basis for operation and data processing, enabling direct and effective comparison of the measured values ​​of symmetrical points, thereby quickly and accurately determining whether there are horizontal deviations in the installation of components such as the drone's wings and tail.

[0022] 9. Using a pin to fix the measuring line ensures that the reference point for measurement remains constant; after straightening the measuring line and making a mark, use a measuring tool to measure. This method is simple but effective and can accurately obtain the horizontal distance from each symmetrical point on the fuselage to the reference axis, thereby comprehensively evaluating the overall symmetry and installation level of the UAV. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0024] Figure 1 This is a schematic diagram of a drone leveling device disclosed in some embodiments of this application when used in conjunction with a drone; Figure 2 This is a rear view of a drone leveling device disclosed in some embodiments of this application when used in conjunction with a drone; Figure 3 This is a schematic diagram of the tail fin support of a UAV horizontal measuring device disclosed in some embodiments of this application; Figure 4This is a side view of a UAV level measuring device disclosed in some embodiments of this application when used in conjunction with a UAV; Figure 5 This is a flowchart of the steps of a UAV horizontal measurement method disclosed in some embodiments of this application; Figure 6 This is a flowchart of step S4 of a UAV horizontal measurement method disclosed in some embodiments of this application; Figure 7 This is a schematic diagram of markings on a drone when using a drone level measurement method disclosed in some embodiments of this application.

[0025] In the picture: 1. Unmanned aerial vehicle (UAV) horizontal measurement device; 2. UAV; 10. Measurement platform; 11. Support assembly; 12. Support assembly; 20. Nose; 21. Tail; 22. Wing; 100. Mounting slot; 101. Level; 102. Leveling knob; 110. Front bracket; 111. Rear bracket; 120. First support component; 121. Second support component; 1100 Lower bracket; 1101 Front bracket; 1102 Mounting hole; 1103 Mounting part; 1104 Fixing part; 1110 Elevating piece; 1111 Tail wing bracket; 1112 Tail wing positioning plate; 1113 Tail wing measuring hole; 1114 Positioning hole. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0027] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] Accurate measurement of the airframe's levelness is a crucial step in the manufacturing, assembly, and post-overhaul debugging of fixed-wing unmanned aerial vehicles (UAVs). Airframe levelness is fundamental to ensuring the UAV's aerodynamic symmetry, stable flight attitude, and the normal operation of onboard equipment (such as aerial survey cameras and radar). Any level deviation will directly lead to problems such as yaw and roll during flight, severely impacting flight safety and mission accuracy.

[0029] Currently, horizontal measurement of drones generally employs traditional methods, typically relying on large platforms or simple supports. During operation, numerous blocks, jacks, and other tools are needed to manually adjust the drone to a roughly level position. Then, general measuring tools such as spirit levels and height gauges are used to perform multi-point measurements on key components such as the wings and tail. This method has several major technical drawbacks: Poor adaptability and low efficiency: Traditional platforms and supports are mostly fixed structures, which cannot flexibly adapt to different models and sizes of drones. Every time a new model is changed, special support fixtures need to be reconfigured or made, which is cumbersome to prepare and has extremely low measurement efficiency.

[0030] Leveling accuracy is difficult to guarantee: relying on manual elevation and visual adjustment, the leveling process is time-consuming and labor-intensive, and it is difficult to ensure that the drone's centerline is strictly parallel to the horizontal plane. Errors in the initial reference will be directly transmitted to all subsequent measurement data, affecting the accuracy of the final results.

[0031] Unreliable positioning and fixation: The drone's fuselage, especially the tail fin, has a complex shape and is not easily stabilized. Existing methods lack an effective positioning mechanism, and the drone is prone to movement or shaking during measurement, resulting in poor measurement repeatability and reduced data reliability.

[0032] Therefore, there is an urgent need in this field for a dedicated UAV level measurement device and method that can quickly, accurately, and reliably complete level measurement work for different types of UAVs, in order to solve the prominent problems of adaptability, accuracy, efficiency, and standardization in the existing technology.

[0033] The following is in conjunction with the appendix Figures 1 to 7 The present application provides a detailed description of a drone level measurement device and method through specific embodiments and application scenarios.

[0034] Please refer to Figures 1 to 4The first embodiment of the present invention provides a drone horizontal measurement device 1 for measuring the horizontal plane of a fixed-wing drone 2. The device includes a measurement platform 10 and a support assembly 11. The measurement platform 10 has multiple parallel mounting slots 100. The support assembly 11 includes a front support 110 at the front end of the measurement platform 10 and a rear support 111 at the rear end of the measurement platform 10, which are fixed to the nose 20 and tail 21 of the drone 2 respectively via screw holes. After fixing, the central axis of the drone 2 is parallel to the horizontal line. To further ensure the parallelism of the drone body, a support assembly 12 is also provided on the measurement platform 10, including a first support member 120 and a second support member 121, with the first support member 120 and the second support member 121 having the same maximum horizontal height. The rear support 111 includes a tail wing support 1111 that matches the shape of the drone's tail wing 21. The tail wing support 1111 includes symmetrically arranged tail wing positioning plates 1112, and the tail wing positioning plates 1112 have tail wing measurement holes 1113.

[0035] Understandably, the multiple parallel mounting slots 100 provided on the measuring platform 10 allow the bracket assembly 11 to be installed in the corresponding mounting slots 100 according to different UAV models and sizes, thus improving the versatility of the device. The bracket assembly 11, as the core component for positioning the UAV before horizontal measurement, has a front bracket 110 at the front end of the measuring platform 10 and a rear bracket 111 at the rear end, which are used to fix the nose and tail of the UAV to be measured, respectively. The bracket design requires that the central axis of the fixed UAV is parallel to the horizontal line. The UAV horizontal measuring device 1 also includes a support assembly 12, provided on the measuring platform 10, comprising a first support member 120 and a second support member 121. When the bracket assembly 11 is installed, these support members respectively support the front and rear halves of the UAV 2, while the highest horizontal heights of the first support member 120 and the second support member 121 are equal. Similarly, it facilitates the mounting of the drone 2 on the bracket assembly 11 and ensures the horizontal state of the drone 2. The rear bracket 111 includes a tail wing bracket 1111 that matches the shape of the drone tail wing 21. The tail wing bracket 1111 includes symmetrically arranged tail wing positioning plates 1112, and the tail wing positioning plates 1112 are provided with tail wing measurement holes 1113. Under the constraint of the tail wing positioning plates 1112, the V-shaped tail wing 21 is reliably fixed. The tail wing measurement holes 1113 on the tail wing positioning plates 1112 facilitate direct measurement of relevant markings on the tail wing 21, improve the measurement accuracy of relevant structural parameters of the tail wing 21, and are not easily affected by external factors, with good measurement repeatability. The drone horizontal measurement device 1 establishes a unified, accurate and reliable physical benchmark for the horizontal measurement of the drone. It ensures that the central axis of the drone is strictly parallel to the horizontal line during measurement, fundamentally eliminating measurement errors caused by inaccurate initial benchmarks.

[0036] Specifically, the aforementioned drone 2 is a fixed-wing drone.

[0037] Furthermore, the front bracket 110 includes a lower bracket 1100 and a front bracket 1101. The lower bracket 1100 is fixed on the mounting groove 100. The lower bracket 1100 is provided with a plurality of mounting holes 1102 along the axial direction of the UAV. Depending on the size of the UAV, the front bracket 1101 and the first support member 120 are detachably mounted on the mounting holes 1102.

[0038] Specifically, the line connecting the centers of the multiple mounting holes 1102 is parallel to the axis of the UAV fuselage.

[0039] Understandably, the structure of "multiple mounting holes 1102 on the lower bracket 1100" and "the front bracket 1101 and the first support 120 being detachable and installable" improves the size adaptability and versatility of the device. Operators can flexibly adjust the installation position of the front bracket 1101 and the support according to the specific size of different drone models, so that one set of devices can meet the measurement needs of various drones, greatly improving the utilization rate of the equipment and reducing the cost of purchasing multiple sets of special tooling.

[0040] Furthermore, the front bracket 1101 has an L-shaped structure, including a mounting part 1103 and a fixing part 1104. When the front bracket 1101 is installed on the lower bracket 1100, the fixing part 1104 is connected and fixed to the lower bracket 1100, and the mounting part 1103 is perpendicular to the plane of the lower bracket 1100 and fixed to the nose 20 of the UAV.

[0041] Specifically, the L-shaped structure separates the functions of the mounting part 1103 and the fixing part 1104, so that the connection surface with the nose 20 can always maintain the correct angle with the axis of the UAV, keeping the UAV 2 in a horizontal state, ensuring the stability of the connection and the reasonable transmission of force. At the same time, this structure is simple and easy to process and assemble.

[0042] Furthermore, please combine Figure 1 and Figure 4 The measuring platform 10 can also be detachably installed with a shim 1110 at its rear end, and the rear bracket 111 is fixed on the shim 1110.

[0043] Specifically, the appropriate shim 1110 can be selected according to the specific model and size of the drone 2. In the whole set of equipment, there are shims with different heights.

[0044] Understandably, the detachable shim 1110 enhances the adaptability of the rear end. For drone models with a large tail structure or a high vertical tail, the installation height of the rear support 111 can be raised by adding different shims 1110, thereby ensuring that the drone 2's body is always in a measurement posture with the central axis parallel to the horizontal line after placement, further expanding the applicability and measurement accuracy of the device.

[0045] Furthermore, please combine Figure 2 and Figure 3 The tail fin support 1111 is provided with a positioning hole 1114 corresponding to the UAV 2.

[0046] Understandably, the positioning hole 1114 corresponding to the UAV 2 is set on the tail fin bracket 1111, which realizes the precise positioning and quick fixation of the tail fin 21. The positioning hole 1114 cooperates with the specific structure on the UAV tail fin 21, which plays the role of coarse positioning and error prevention, ensuring that the position of the UAV is consistent every time it is placed on the device, reducing adjustment time, improving measurement efficiency and data consistency.

[0047] Furthermore, leveling knobs 102 are provided around the bottom of the measuring platform 10, and a level 101 is provided on the surface of the measuring platform 10.

[0048] Understandably, by setting the leveling knob 102 and the level 101, the measuring platform 10 can be quickly and accurately leveled. Operators can easily ensure the initial levelness of the entire measuring platform 10 by observing the level 101 and rotating the leveling knob 102. This is the fundamental prerequisite for ensuring the accuracy of all subsequent measurement data. This design simplifies the leveling process, reduces dependence on the operating environment, and improves the independence and ease of operation of the device.

[0049] Please refer to Figure 5 The second embodiment of the present invention also provides a method for measuring the horizontal level of a UAV, which uses a UAV horizontal measuring device 1 as provided in the first embodiment for measurement, and includes the following steps: S1 uses a marking tool to mark lines and points on the nose, tail, wings, and tail fin of an unassembled drone. S2. Assemble the drone components after marking the lines and points, build the drone leveling measuring device, and level the measuring platform using the leveling knob and level. S3, move the drone onto the support assembly, fix the nose and front bracket to the corresponding positions, and fix the tail and tail fin bracket to the corresponding positions, and then remove the support assembly; S4. Use an altitude gauge to measure the points on the fuselage and wings and record them as Z values; use a depth gauge to measure the points on the tail wing through the tail wing positioning holes on the tail wing positioning plate and record them as Z' values; use the reserved hole on the top of the UAV front cabin as the base point to measure the distance of symmetrical points on the wings and tail wing respectively by pulling a line. S5. Statistically analyze the Z-values, Z'-values, and distance measurement values ​​using the string line, calculate their horizontal measurement tolerance, and verify whether the parameters of the UAV fuselage meet the standards.

[0050] For details, please refer to Figure 7 The specific markings on the drone are as follows: points 1-2 are measurement points on the fuselage, points 11-14 are measurement points on the wings, and points 21-24 are measurement points on the tail. Each number is further divided into two points, left (L) and right (R), for a total of 20 points. For example, in the figure, 1L represents point 1 on the left and 1R represents point 1 on the right.

[0051] Specifically, Figure 7 The 0 point in the equation is the base point mentioned in step S4.

[0052] Understandably, by specifying specific measurement points on the drone, and based on a measurement device that keeps the drone strictly level, the reliability of the drone's level measurement is guaranteed, achieving the same beneficial effects as the aforementioned drone level measurement device 1.

[0053] It should be noted that, for ease of recording and calculation, when recording the Z value, Z refers to the Z value in the three-dimensional coordinate system of the body.

[0054] Specifically, the Z value is based on the plane where the measurement platform 10 is located, and the Z' reference is the plane where the fuselage axis of the UAV 2 is located.

[0055] Specifically, by recording the actual Z-values ​​and Z' values ​​and comparing them with those in the aircraft design manual, the overall structural deviation is obtained. Then, according to the aircraft horizontal measurement tolerances specified in HB / Z103-86, the horizontal measurement tolerances of the actual airframe are calculated, and key airframe structural parameters such as fuselage torsion, wing installation angle, wing dihedral angle, and wing Z-direction symmetry are calculated. Furthermore, by calculating the difference between the wire-measured distance values, the wing deflection, tail installation angle, tail tilt angle, and tail skewness of the airframe are calculated. Thus, a complete set of measurement structures for the fixed-wing UAV airframe is obtained, which is then compared with industry standard tolerances to verify whether the UAV is qualified.

[0056] It should be noted that before mounting the fixed-wing UAV onto the measuring device, the UAV's seeker, engine, and tail cowl must not be installed, and the wings must be in the deployed state.

[0057] Furthermore, the diameter of the points on the drone body is 1mm-2mm, and the allowable drilling depth is 0.5mm-0.8mm.

[0058] Understandably, limiting the "point diameter" and "allowable drilling depth" and standardizing the marking operation to ensure measurement accuracy, this quantitative standard avoids measurement errors caused by points that are too large or too deep when marking points, and ensures that the measuring tool can accurately position the point at the same location every time, thereby obtaining more accurate and stable data.

[0059] Specifically, during the point drawing process, a 2mm drill bit is used to drill holes to ensure accuracy and clarity. When measuring and finding points, a tooling is used to draw the points, and then the holes are drilled. This process may cause a deviation of about 1mm, which translates to a deviation of approximately 0.3mm in the Z-direction and an angular deviation of approximately 0.1°.

[0060] Further, please refer to Figure 7 The marker point located on one side of the drone's fuselage axis is defined as the left marker point, and the marker point located on the opposite side of the drone's fuselage axis is defined as the right marker point. The left marker point and the right marker point are symmetrically arranged about the drone's fuselage axis.

[0061] Specifically, during the marking operation, the wings, tail, and fuselage are all disassembled and installed on their respective marking fixtures. The marking fixtures are designed according to the drone model and are equipped with corresponding marking point holes to ensure the accuracy of the markings.

[0062] Understandably, ensuring strict symmetry of the marked points during punctuation provides a clear basis for operation and data processing, enabling direct and effective comparison of the measured values ​​of symmetrical points, thereby quickly and accurately determining whether there are horizontal deviations in the installation of components such as the drone's wings and tail.

[0063] Further, please refer to Figure 6 Step S4 also includes the following steps: S40, insert the matching threading pin into the reserved hole on the top of the front cabin plate and fix it with a nut; press one end of the measuring line with the threading pin, pull the other end until it reaches the point to be measured and mark it, and use a tape measure to measure the length of the line.

[0064] Understandably, using pins to fix the measuring line ensures that the reference point for measurement remains constant. Straightening the measuring line and marking it before measuring with measuring tools is a simple but effective method that can accurately obtain the horizontal distance from each symmetrical point on the fuselage to the reference axis, thereby comprehensively evaluating the overall symmetry and installation level of the UAV.

[0065] Specifically, reserved holes and Figure 7If the zero point is consistent with the zero point, insert the matching threading pin into the reserved hole on the top of the front cabin plate and fix it with a nut; tighten one end of the Kevlar or steel rope with the threading pin, straighten the other end to the point to be measured and mark it, use a tape measure to measure the line length and fill it into the corresponding table.

[0066] The following specific embodiment illustrates the process of performing horizontal measurement on a fixed-wing drone using the drone horizontal measurement device and method provided by this invention: According to the method provided in the second embodiment, and in combination with Figure 7 The drone fuselage was marked and measured. The specific measurement results are shown in Table 1 below: Table 1: Coordinate Measurement Data of UAV Based on the above statistics, we began to calculate the various structural parameters of the drone body.

[0067] The fuselage torsion calculation is shown in Table 2 below: Table 2: Measurement Table of Fuselage Torsion The calculation results of the wing installation angle are shown in Table 3 below: Table 3: Measurement Table of Wing Mounting Angle Specifically, the wing installation angle is the angle between the line connecting the interval points on the wing and the horizontal line. The wing installation angle can be obtained using the triangle cosine formula, and the calculation results are shown in Table 4 below: Table 4: Calculation Table for Wing Mounting Angle Adding the data in the table above, we can obtain the twist angle of one side of the wing as shown in Table 5 below: Table 5: Calculation Table for Wing Twist Angle The calculation of the dihedral angle of the wing is shown in Table 6 below: Table 6: Measurement Table of Wing Dihedral Angle Specifically, the method of representing the dihedral angle of the wing is similar to that of the wing mounting angle mentioned above, and the calculation results are shown in Table 7 below: Table 7: Calculation Table for Wing Dihedral Angle The Z-direction symmetry of the wing is calculated as shown in Table 8 below: Table 8: Calculation Table of Wing Z-direction Symmetry The symmetry expressed by Z values ​​in the table above can be converted into an angular representation using the cosine formula, as shown in Table 9 below: Table 9: Wing Symmetry Calculation Table The wing skewness is calculated as shown in Table 10 below: Table 10: Wing Skew Calculation Table The tail fin installation angle is calculated as shown in Table 11 below: Table 11: Measurement Table of Tail Fender Mounting Angle The installation angles expressed in Z values ​​in the table above are converted into angles, as shown in Table 12 below: Table 12: Calculation Table for Tail Fender Mounting Angle Adding the data in the table above, we can obtain the twist angle of one side of the tail fin as shown in Table 13 below: Table 13: Calculation Table for Tail Wing Twist Angle The calculation of the tail fin cant angle is shown in Table 14 below: Table 14: Tail Fender Cancellation Angle Measurement Table The tilt angles expressed in Z-values ​​in the table above are converted into angles using the cosine formula, as shown in Table 15 below: Table 15: Calculation Table for Tail Fender Cancellation Angle The calculation of the tail fin skew is shown in Table 16 below: Table 16: Tail Fender Skew Measurement Table The skewness expressed in length values ​​in the table above is converted into angles, as shown in Table 17 below: Table 17: Calculation Table for Tail Fender Skewness Simultaneously, based on the measurement results and the length of point 0-21, the leading edge sweep angle of the tail fin can be obtained as shown in Table 18 below: Table 18: Calculation Table for Leading Edge Sweep Angle of Tail Fly The measurement and calculation results are summarized in Table 19 below: Table 19: Summary Table of UAV Horizontal Measurement Results This yields the overall fuselage parameters of the drone. Then, based on industry standards and aircraft design manuals, it is determined whether the drone meets the standards for flight deployment.

[0068] The UAV horizontal measurement device and method provided by this invention have the following beneficial technical effects compared with the prior art: The measurement platform has multiple parallel mounting slots, allowing the bracket assembly to be installed in the corresponding slots according to different drone models and sizes, thus improving the device's versatility. The bracket assembly, as the core component for positioning the drone before horizontal measurement, consists of a front bracket at the front of the measurement platform and a rear bracket at the rear, used to fix the drone's nose and tail, respectively. The bracket design ensures that the drone's centerline is parallel to the horizontal line after fixing. The measurement device also includes a support assembly on the measurement platform, comprising a first support member and a second support member. During bracket assembly installation, these support members respectively support the front and rear halves of the drone, and both support members have the same maximum horizontal height. This device facilitates the mounting of the drone on the support assembly and ensures the drone's horizontal position. The rear support includes a tail fin support that matches the shape of the drone's tail fin. The tail fin support includes symmetrically arranged tail fin positioning plates with tail fin measurement holes. The V-shaped tail fin is reliably fixed under the constraint of the tail fin positioning plates. The tail fin measurement holes on the positioning plates facilitate direct measurement of relevant markings on the tail fin, improving the measurement accuracy of tail fin structural parameters. It is less susceptible to external influences and has good measurement repeatability. This measurement device establishes a unified, accurate, and reliable physical benchmark for the horizontal measurement of the drone, ensuring that the drone's centerline is strictly parallel to the horizontal line during measurement, fundamentally eliminating measurement errors caused by inaccurate initial benchmarks.

[0069] It should be noted that the same person should pull the line at all points to maintain even force as much as possible; when using a measuring tape to measure the line length, another person should assist to ensure that the line is close to one side of the measuring tape and that the measuring tape is not twisted or bent.

[0070] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0071] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A horizontal measuring device for unmanned aerial vehicles (UAVs), used for measuring the horizontal position of the UAV body, characterized in that, include: A measuring platform, wherein multiple parallel mounting slots are provided on the measuring platform; The support assembly includes a front support at the front end of the measurement platform and a rear support at the rear end of the measurement platform, which are fixed to the nose and tail of the UAV respectively through screw holes. After fixing, the central axis of the UAV is parallel to the horizontal line. A support assembly, disposed on the measuring platform, includes a first support member and a second support member, wherein the first support member and the second support member have the same maximum horizontal height; The rear support includes a tail wing support that matches the shape of the UAV's tail wing. The tail wing support includes symmetrically arranged tail wing positioning plates, and the tail wing positioning plates have tail wing measurement holes.

2. The UAV horizontal measurement device according to claim 1, characterized in that, The front-end bracket includes a lower bracket and a front bracket. The lower bracket is fixed on the mounting groove and has multiple mounting holes along the axial direction of the UAV. Depending on the size of the UAV, the front bracket and the first support member are detachably mounted on the mounting holes.

3. The UAV horizontal measurement device according to claim 2, characterized in that, The front bracket has an L-shaped structure, including a mounting part and a fixing part. When the front bracket is installed on the lower bracket, the fixing part is connected and fixed to the lower bracket, and the mounting part is perpendicular to the plane of the lower bracket and fixed to the nose of the drone.

4. The UAV leveling measurement device according to claim 1, characterized in that, The rear end of the measurement platform can also be detachably installed with a shim, and the rear end bracket is fixed on the shim.

5. The UAV horizontal measurement device according to claim 1, characterized in that, The tail fin support is equipped with positioning holes corresponding to the UAV.

6. The UAV horizontal measurement device according to claim 1, characterized in that, The measuring platform is equipped with leveling knobs around its bottom and a level on its surface.

7. A method for measuring the level of a UAV, using the UAV level measuring device as described in any one of claims 1-6, characterized in that, Includes the following steps: S1 uses a marking tool to mark lines and points on the nose, tail, wings, and tail fin of an unassembled drone. S2. Assemble the drone components after marking the lines and points, build the drone leveling measuring device, and level the measuring platform using the leveling knob and level. S3, move the drone onto the support assembly, fix the nose and front bracket to the corresponding positions, and fix the tail and tail fin bracket to the corresponding positions, and then remove the support assembly; S4. Use an altitude gauge to measure the points on the fuselage and wings and record them as Z values; use a depth gauge to measure the points on the tail wing through the tail wing positioning holes on the tail wing positioning plate and record them as Z' values; use the reserved hole on the top of the UAV front cabin as the base point to measure the distance of symmetrical points on the wings and tail wing respectively by pulling a line. S5. Statistically analyze the Z-values, Z'-values, and string distance measurements, calculate their horizontal measurement tolerances, and verify whether the parameters of the UAV fuselage meet the standards.

8. A method for horizontal measurement of a UAV according to claim 7, characterized in that, The diameter of the points on the drone body is 1mm-2mm, and the allowable drilling depth is 0.5mm-0.8mm.

9. A method for horizontal measurement of an unmanned aerial vehicle (UAV) according to claim 7, characterized in that, The marker point located on one side of the drone's fuselage axis is defined as the left marker point, and the marker point located on the opposite side of the drone's fuselage axis is defined as the right marker point. The left marker point and the right marker point are symmetrically arranged about the drone's fuselage axis.

10. A method for horizontal measurement of an unmanned aerial vehicle according to claim 7, characterized in that, Step S4 also includes the following steps: S40, insert the provided threading pin into the reserved hole on the top of the front cabin plate and fix it with a nut; press one end of the measuring line with the threading pin, pull the other end to the point to be measured and mark it, and use a tape measure to measure the length of the line.

Images