A method for measuring the height of a multi-rib composite wall panel

Abstract

The application discloses a kind of multi-longitudinal wall composite wallboard longitudinal wall height measurement methods, comprising the following steps: S01, measurement equipment stationing;S02, longitudinal wall measurement characteristic planning;Including wallboard inner surface measurement grid planning, longitudinal wall measurement section planning, longitudinal wall height surface point position planning, longitudinal wall bend angle surface point position planning step;S03, longitudinal wall characteristic point measurement;Including wallboard inner surface planning point position measurement, longitudinal wall height surface point position measurement, longitudinal wall bend angle surface point position measurement step;S04, measurement data fitting analysis, obtain longitudinal wall actual height.The application is measured based on the overall forming tool of multi-longitudinal wall composite wallboard, and measurement equipment is placed in the overall coordinate system of aircraft, to ensure that the measurement datum and the overall coordinate system of aircraft have good coincidence, so as to ensure the measurement accuracy of longitudinal wall height;The measurement method can realize the automatic measurement of composite wallboard, and has high measurement accuracy and high reliability.

Description

Technical Field

[0001] This invention belongs to the field of measurement technology, specifically relating to a method for measuring the height of longitudinal walls in multi-wall composite wall panels. Background Technology

[0002] Currently, composite materials are increasingly being used in aircraft to manufacture external parts and airframe structures. Compared with metal materials, composite materials have advantages such as high specific strength and corrosion resistance. However, they also present challenges in controlling and measuring the machining accuracy of the molded parts.

[0003] A type of multi-wall composite panel structure, manufactured using composite materials and possessing both external covering (skin) and skeletal characteristics, presents significant challenges in dimensional measurement after molding, particularly the measurement of the longitudinal wall heights. Currently, wall height measurements are typically taken on a composite molding fixture. However, this method is problematic because composite parts deform after being removed from the fixture, leading to inaccurate measurements that do not accurately reflect the actual dimensions of the product. Furthermore, during molding, the outer surface is used as the film-coating surface, and the reference point is on the outer surface, causing thickness errors to accumulate on the inner surface. During assembly, the bonding surface becomes the inner surface, further contributing to the thickness error in the wall height measurement. If measurements are not taken on a molding fixture, there is no reference point after demolding, making measurement impossible. Additionally, the cantilevered structure of the multi-wall composite panel tilts after demolding, hindering accurate measurements. Summary of the Invention

[0004] The purpose of this invention is to provide a method for measuring the longitudinal wall height of multi-wall composite wall panels, thereby solving the problem that the longitudinal wall height of multi-wall composite wall panels cannot be accurately measured in the prior art.

[0005] This invention is achieved through the following technical solution:

[0006] A method for measuring the longitudinal wall height of a multi-longitudinal-wall composite panel, wherein the multi-longitudinal-wall composite panel includes a panel and multiple longitudinal walls sequentially arranged on the panel, and the measurement method includes the following steps:

[0007] S01. Setting up the measurement equipment station;

[0008] S02, Longitudinal wall measurement feature planning; including the steps of planning the measurement grid for the inner surface of the wall panel, planning the longitudinal wall measurement section, planning the longitudinal wall height surface points, and planning the longitudinal wall corner surface points;

[0009] S03, Measurement of longitudinal wall feature points; including the steps of measuring the planned points on the inner surface of the wall panel, measuring the points on the height surface of the longitudinal wall, and measuring the points on the corner surface of the longitudinal wall;

[0010] S04. Measurement data fitting analysis to obtain the actual height of the longitudinal wall; including:

[0011] The measured data are fitted to obtain the measured plane of the inner surface of the wall panel, the measured plane of the longitudinal wall height, and the measured plane of the longitudinal wall corner.

[0012] The intersection point of the longitudinal wall measurement section, the measured plane of the longitudinal wall height, and the measured plane of the longitudinal wall bend angle is called intersection point a;

[0013] The intersection point between the longitudinal wall measurement section, the measured plane of the longitudinal wall height, and the measured plane of the inner surface of the wall panel is designated as intersection point b.

[0014] Obtain the distance between intersection point a and intersection point b to get the actual height of the longitudinal wall.

[0015] As a further improvement to the above technical solution, the measurement equipment setup in step S01 includes the following steps:

[0016] S011. Set preset positioning points on the forming fixture and import the theoretical coordinates of the preset positioning points into the measuring equipment; the forming fixture is a multi-longitudinal wall composite wall panel integral forming fixture, including a longitudinal wall forming fixture that cooperates with the longitudinal wall and a wall panel forming fixture that cooperates with the wall panel. The forming fixture is set with target points for measurement and the theoretical coordinates of the target points are imported into the measuring equipment.

[0017] S012. Measure the preset points and target points on the forming tooling using measuring equipment to obtain the measured coordinates of the preset points and target points;

[0018] S013. By calculating the theoretical and measured coordinates of the preset positioning points and target points, the measuring equipment is placed in the overall coordinate system of the aircraft.

[0019] As a further improvement to the above technical solution, the operation steps for planning the measurement of the inner surface of the wall panel in step S02 are as follows:

[0020] Using 3D modeling software, the measurement positions on the inner surface of the composite wall panel are meshed in the 3D digital model of the wall panel. When meshing, the rounded corner area of ​​the longitudinal wall structure is avoided. The meshing method is to arrange points on both sides of the longitudinal wall, namely the first side point and the second side point.

[0021] As a further improvement to the above technical solution, the operation steps for planning the longitudinal wall measurement section in step S02 are as follows: set the cross section of the longitudinal wall perpendicular to the bottom surface as the longitudinal wall measurement section, and fit the function expression of each longitudinal wall measurement section.

[0022] As a further improvement to the above technical solution, the operation steps for planning the height points of the longitudinal wall in step S02 are as follows: using three-dimensional modeling software, the measurement positions of the height surface of the longitudinal wall are planned in the three-dimensional digital model of the composite wall panel. The rounded corner area of ​​the longitudinal wall structure is avoided during the grid planning. The grid planning method is to arrange the points on the height surface of the longitudinal wall.

[0023] As a further improvement to the above technical solution, the operation steps for planning the points on the longitudinal wall corner surface in step S02 are as follows: using three-dimensional modeling software, the measurement positions of the longitudinal wall corner surface are planned in the three-dimensional digital model of the composite wall panel. When planning the grid, the rounded corner area of ​​the longitudinal wall structure is avoided. The grid planning method is to arrange the points on the longitudinal wall corner surface.

[0024] As a further improvement to the above technical solution, the operation steps for measuring the planned points on the inner surface of the wall panel in step S03 are as follows: use measuring equipment to measure the first side point and the second side point to obtain the measured point coordinate data of the first side point and the second side point;

[0025] In step S04, the function expression of the measured plane of the inner surface of the wall panel is obtained by fitting the measured coordinate data of the first measuring point and the second side point.

[0026] As a further improvement to the above technical solution, the operation steps for measuring the height of the longitudinal wall surface in step S03 are as follows: use measuring equipment to measure the height of the longitudinal wall surface and obtain the measured coordinate data of the height of the longitudinal wall surface.

[0027] In step S04, the function expression of the measured plane of the longitudinal wall height surface is obtained by fitting the measured coordinate data of the points on the longitudinal wall height surface.

[0028] As a further improvement to the above technical solution, the operation steps for measuring the longitudinal wall corner surface points in step S03 are as follows: use measuring equipment to measure the longitudinal wall corner surface points and obtain the measured point coordinate data of the longitudinal wall corner surface points.

[0029] In step S04, the function expression of the measured plane of the longitudinal wall bend is obtained by fitting the measured coordinate data of the points on the longitudinal wall bend.

[0030] As a further improvement to the above technical solution, the actual height value of the longitudinal wall is compared with the theoretical height value to determine whether the height of the composite wall panel longitudinal wall is qualified.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1) In the measurement method of the present invention, the measurement is carried out based on the integral forming tooling of multi-longitudinal wall composite panels, and the measuring equipment is placed under the overall coordinate system of the aircraft to ensure that the measurement reference has a good degree of overlap with the overall coordinate system of the aircraft, thereby ensuring the measurement accuracy of the longitudinal wall height.

[0033] 2) By retaining the forming fixture of the multi-longitudinal wall composite panel during measurement, and then removing the forming fixture of the longitudinal wall, the longitudinal wall of the composite panel can be in a free state during measurement. This makes the measurement of the longitudinal wall closer to the state of the composite panel parts during assembly, thus ensuring the processing and assembly accuracy of the composite panel parts.

[0034] 3) The measurement and calculation of the longitudinal wall height are based on the bottom surface of the composite wall panel (the inner surface of the wall panel, i.e. the actual assembly and use surface). Compared with the part film surface as the reference, this avoids the influence of the thickness tolerance of the composite wall panel on the measurement, making the measurement data closer to the actual situation.

[0035] 4) This measurement method enables automated measurement of composite wall panels, with high accuracy and reliability. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart of the method for measuring the longitudinal wall height of multi-wall composite wall panels according to the present invention.

[0038] Figure 2 This is a flowchart of the measurement equipment setup steps in the multi-wall composite panel longitudinal wall height measurement method of the present invention.

[0039] Figure 3 This is a flowchart of the longitudinal wall measurement feature planning steps in the longitudinal wall height measurement method for multi-longitudinal wall composite panels of the present invention.

[0040] Figure 4 This is a flowchart of the longitudinal wall feature point measurement steps in the multi-longitudinal wall composite panel longitudinal wall height measurement method of the present invention.

[0041] Figure 5 This is a flowchart of the measurement data fitting and analysis steps in the method for measuring the longitudinal wall height of multi-longitudinal-wall composite wall panels of the present invention.

[0042] Figure 6 This is a schematic diagram of the structure of the multi-longitudinal-wall composite panel on the forming fixture in the multi-longitudinal-wall composite panel height measurement method of the present invention.

[0043] Figure 7 This is a schematic diagram of the measurement position of the longitudinal wall of the multi-longitudinal-wall composite panel in the method for measuring the longitudinal wall height of the multi-longitudinal-wall composite panel of the present invention.

[0044] Figure 8 This is a three-dimensional schematic diagram of the measurement position of the longitudinal wall of the multi-longitudinal wall composite panel in the method for measuring the height of the longitudinal wall of the multi-longitudinal wall composite panel of the present invention.

[0045] Figure 9 This is a structural schematic diagram showing the theoretical and actual positions of the longitudinal walls of the multi-longitudinal-wall composite panel in the method for measuring the height of the longitudinal walls of the multi-longitudinal-wall composite panel of the present invention.

[0046] Among them: 11. Forming fixture for longitudinal walls; 12. Forming fixture for wall panels.

[0047] 21. Composite wall panel; 22. Longitudinal wall of composite wall panel;

[0048] 31. Bottom surface of longitudinal wall; 32. Cross-section of longitudinal wall; 33. Height surface of longitudinal wall; 34. Corner surface of longitudinal wall;

[0049] 4. Theoretical position of longitudinal wall in composite wall panel; 5. Actual position of longitudinal wall in composite wall panel; 6. Theoretical position of bottom surface of longitudinal wall; 7. Actual position of bottom surface of longitudinal wall. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0051] The method for measuring the longitudinal wall height of multi-longitudinal-wall composite panel in this embodiment involves a panel 21 and multiple longitudinal walls 22 sequentially arranged on the panel. Measurement is performed using molding fixtures and measuring equipment. During measurement, the molding fixtures for some of the longitudinal walls are removed, leaving only the molding fixtures for the multi-longitudinal-wall composite panel (hereinafter referred to as "molding fixtures") to measure the height of the longitudinal walls. (Refer to...) Figure 6-9 As shown. From Figure 9 As can be seen, after removing the forming fixtures for the longitudinal wall, there is a difference between the theoretical and actual positions of the longitudinal wall and its bottom surface.

[0052] A method for measuring the longitudinal wall height of a multi-longitudinal-wall composite panel, wherein the multi-longitudinal-wall composite panel includes a panel and multiple longitudinal walls sequentially arranged on the panel, and the measurement method includes the following steps:

[0053] S01. Setting up the measurement equipment station;

[0054] S02, Longitudinal wall measurement feature planning; including the steps of planning the measurement grid for the inner surface of the wall panel, planning the longitudinal wall measurement section, planning the longitudinal wall height surface points, and planning the longitudinal wall corner surface points;

[0055] S03, Measurement of longitudinal wall feature points; including the steps of measuring the planned points on the inner surface of the wall panel, measuring the points on the height surface of the longitudinal wall, and measuring the points on the corner surface of the longitudinal wall;

[0056] S04. Measurement data fitting analysis to obtain the actual height of the longitudinal wall; including:

[0057] The measured data are fitted to obtain the measured plane of the inner surface of the wall panel, the measured plane of the longitudinal wall height, and the measured plane of the longitudinal wall corner.

[0058] The intersection point of the longitudinal wall measurement section, the measured plane of the longitudinal wall height, and the measured plane of the longitudinal wall bend angle is called intersection point a;

[0059] The intersection point between the longitudinal wall measurement section, the measured plane of the longitudinal wall height, and the measured plane of the inner surface of the wall panel is designated as intersection point b.

[0060] Obtain the distance between intersection point a and intersection point b to get the actual height of the longitudinal wall.

[0061] Specifically, refer to Figure 1-5 The method for measuring the longitudinal wall height of multi-wall composite wall panels in this embodiment includes the following steps:

[0062] S01, Measurement equipment setup; such as Figure 2 ,include:

[0063] S011: Import the theoretical coordinates of the preset positioning points on the forming fixture into the measuring equipment; import the theoretical coordinates of the target points on the forming fixture into the measuring equipment.

[0064] The forming fixture is used for laying multi-longitudinal wall composite panels. This forming fixture is an integral forming fixture for multi-longitudinal wall composite panels, including a longitudinal wall forming fixture 11 that mates with the longitudinal walls and a panel forming fixture 12 that mates with the panels. The forming fixture is equipped with target points for measurement. These target points can be spherical, perforated, or specially coded visual recognition points—feature entities whose unique spatial coordinates can be obtained through measurement. The target points can be points with given positions in the overall coordinate system of the aircraft. The theoretical coordinates of the target points are input into the storage device of the measuring equipment or an external computer connected to the measuring equipment.

[0065] S012: Drive the measuring equipment to measure the preset positioning points and target points on the forming tooling, and obtain the spatial coordinates of the preset points and target points.

[0066] The measuring equipment can be optical measuring equipment, contact measuring equipment, or vision recognition measuring equipment;

[0067] Optical measuring devices, such as laser trackers and lidar, obtain the actual measured position of the measurement point through optical mirrors;

[0068] Contact-type measuring equipment, such as coordinate measuring machines and measuring arms, uses a contact measuring device installed on the measuring equipment to touch the target point and obtain the actual measured position of the target point;

[0069] Visual recognition measurement equipment uses a camera to capture images and identify the codes in the target points to obtain the actual measured locations of the target points.

[0070] S013: By calculating the theoretical and measured coordinates of the preset positioning points and target points, the measuring equipment is placed in the overall coordinate system of the aircraft to be installed on the composite panel.

[0071] In the actual calculation process, the measuring device is placed in the overall coordinate system of the aircraft by using the best fit method.

[0072] S02, Longitudinal wall measurement feature planning; such as Figure 3 ,include:

[0073] S021: Mesh planning for the inner surface measurement of the wall panel; using 3D modeling software, mesh planning for the measurement positions of the inner surface of the wall panel is carried out in the 3D digital model of the composite wall panel; the rounded corner areas of the longitudinal wall structure are avoided during mesh planning;

[0074] The grid planning method is as follows: Points are arranged on one side of the longitudinal wall and named the first side points; the points can be arranged at equal intervals or randomly; points are arranged on the other side of the longitudinal wall and named the second side points; the points can be arranged at equal intervals or randomly.

[0075] S022: Planning of longitudinal wall measurement section; A cross-section perpendicular to the bottom surface of the longitudinal wall is taken as the longitudinal wall measurement section, such as... Figure 7 and 8 As shown, the plane is defined as plane T, and the plane numbers are 1, 2, 3...n.

[0076] The equation of plane T, fitted by software, is: A T X+B T Y+C T Z+D T =0. The equations of the planes numbered 1 through n are respectively expressed as: A T1 X+B T1 Y+C T1 Z+D T1 =0……A Tn X+B Tn Y+C Tn Z+D Tn=0; where for the plane 1...n, A T1 B T1 C T1 D T1 ...A Tn B Tn C Tn D Tn All of these are known numbers.

[0077] S023: Longitudinal wall height surface point planning; using 3D modeling software, perform grid planning for the measurement positions of the longitudinal wall height surface in the 3D digital model of the composite wall panel; avoid the rounded corner area of ​​the longitudinal wall structure during grid planning; the grid planning method is to arrange points on the longitudinal wall height surface and name them as height surface points. The arrangement of longitudinal wall height surface points can be equidistant or random.

[0078] S024: Longitudinal wall corner surface point planning; using 3D modeling software, perform grid planning for the measurement positions of longitudinal wall corner surfaces in the 3D digital model of the composite wall panel; avoid the rounded corner area of ​​the longitudinal wall structure during grid planning; the grid planning method is to arrange points on the longitudinal wall corner surface and name them corner surface points. The arrangement of longitudinal wall corner surface points can be equidistant or random.

[0079] S03, Measurement of longitudinal wall feature points; such as Figure 4 ,include:

[0080] S031: Measurement of planned points on the inner surface of the wall panel; use measuring equipment to measure the first side point and the second side point to obtain the actual measured point coordinate data of the first side point and the second side point; the measurement method used here is the same as the method for measuring the preset positioning points on the forming tooling.

[0081] S032: Measurement of height points on the longitudinal wall; use measuring equipment to measure the height points and obtain the actual coordinate data of the height points; the measurement method used here is the same as the method for measuring the preset positioning points on the forming fixture.

[0082] S033: Measurement of points on the bends of the longitudinal wall; use measuring equipment to measure the points on the bends and obtain the actual coordinate data of the points on the bends; the measurement method used here is the same as the method for measuring the preset positioning points on the forming fixture.

[0083] S04, Measurement data fitting and analysis; such as Figure 5 ,include:

[0084] S041: Fitting to form the measured plane of the inner surface of the wall panel; by using the measured coordinate data of the first side point and the measured coordinate data of the second side point, fitting to form the measured plane of the inner surface of the wall panel, which is defined as plane D;

[0085] The equation of plane D is obtained as: A D X+B D Y+C D Z+D D =0; the planes are numbered 1, 2, 3...n. The equations of the planes numbered 1...n are respectively: A D1 X+B D1 Y+C D1 Z+D D1 =0……A Dn X+B Dn Y+C Dn Z+D Dn =0; where for the plane 1...n, A D1 B D1 C D1 D D1 ...A Dn B Dn C Dn D Dn The number is known.

[0086] The selection principle for the measured points of the first and second sides of the fitted plane is to arrange them on both sides of the defined tangent plane T, and the number of selected points is greater than 3.

[0087] S042: Fitting to form the measured plane of the longitudinal wall height; the measured plane of the longitudinal wall height is formed by fitting the coordinate data of the measured points on the height surface, such as... Figure 7 and 8 As shown, it is defined as plane G;

[0088] The measured plane equation of the longitudinal wall height surface is A. G X+B G Y+C G Z+D G =0. The planes are numbered 1, 2, 3...n, where the equations of the planes numbered 1...n are respectively: A G1 X+B G1 Y+C G1 Z+D G1 =0……A Gn X+B Gn Y+C Gn Z+D Gn =0; where for the plane 1...n, A G1 B G1 C G1 D G1 ...A Gn B Gn C Gn D Gn The number is known.

[0089] The principle for selecting measured points on the height surface is to arrange them on both sides of the defined tangential plane T, with a selection of more than 3 points.

[0090] S043: Fitting to form the measured plane of the longitudinal wall bend surface; the measured plane of the longitudinal wall bend surface is formed by fitting the coordinate data of the measured points on the longitudinal wall bend surface, such as... Figure 7 and 8 As shown, it is defined as plane W;

[0091] The measured plane equation of the longitudinal wall bend is: A W X+B W Y+C W Z+D W =0; the planes are numbered 1, 2, 3...n respectively, and the equations of the planes numbered 1...n are A... W1 X+B W1 Y+C W1 Z+D W1 =0……A Wn X+B Wn Y+C Wn Z+D Wn =0; where for the plane 1...n, A W1 B W1 C W1 D W1 ...A Wn B Wn C Wn D Wn The number is known.

[0092] The principle for selecting measured points on the curved surface is to arrange them on both sides of the defined tangential plane T, and the number of selected points should be greater than 3.

[0093] S044: The intersection point of the three planes is obtained by solving the equations of plane T, plane G, and plane W;

[0094] By solving the following set of equations, we can find the intersection point of the three planes, denoted as intersection point a, with coordinates (X, Y). a Y a Z a The equation is as follows:

[0095]

[0096] The coordinates of the intersection point a of the 1st to nth tangent planes are respectively (X... a1 Y a1 Z a1 )……(X an Y an Z an The calculation formulas are as follows:

[0097]

[0098] ...

[0099]

[0100] S045: The intersection point of the three planes is obtained by solving the equations of plane T, plane G, and plane D;

[0101] By solving the following set of equations, we can find the intersection point of the three planes, denoted as intersection point b, with coordinates (X, Y). b Y b Z b The equation is as follows:

[0102]

[0103] The coordinates of the b intersection points of the 1st to nth tangent planes are respectively (X... b1 Y b1 Z b1 )……(X bn Y bn Z bn The calculation formulas are as follows:

[0104]

[0105] ...

[0106]

[0107] S046: Find the distance h from intersection point a to intersection point b, which gives the actual height of the longitudinal wall;

[0108] The height h can be obtained by solving for the distance between two points; the calculation formula is:

[0109]

[0110] Wherein, the height h coordinates of the 1st to nth cross-sections are h1 to h2 respectively. n The calculation formula is as follows:

[0111]

[0112] ...

[0113]

[0114] At this point, the actual height h of the longitudinal wall of the composite wall panel can be obtained.

[0115] The manufacturing error of the longitudinal wall height can be obtained by taking the difference between the actual height of the longitudinal wall and the theoretical height at that location. Comparing this error with the error threshold will determine whether the longitudinal wall height is up to standard.

[0116] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0117] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0118] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0119] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for measuring the longitudinal wall height of a multi-longitudinal-wall composite panel, the multi-longitudinal-wall composite panel comprising a panel and a plurality of longitudinal walls sequentially arranged on the panel, characterized in that, The measurement method includes the following steps: S01. Setting up the measurement equipment station; S02, Longitudinal wall measurement feature planning; including the steps of planning the inner surface measurement grid of the wall panel, planning the longitudinal wall measurement section, planning the longitudinal wall height surface point, and planning the longitudinal wall corner surface point; among which, the longitudinal wall measurement section planning is: setting the cross section of the longitudinal wall perpendicular to the bottom surface as the longitudinal wall measurement section, and fitting the function expression of each longitudinal wall measurement section; S03, Measurement of longitudinal wall feature points; including the steps of measuring the planned points on the inner surface of the wall panel, measuring the points on the height surface of the longitudinal wall, and measuring the points on the corner surface of the longitudinal wall; S04. Measurement data fitting analysis to obtain the actual height of the longitudinal wall; including: The measured data are fitted to obtain the measured plane of the inner surface of the wall panel, the measured plane of the longitudinal wall height, and the measured plane of the longitudinal wall corner. The intersection point of the longitudinal wall measurement section, the measured plane of the longitudinal wall height, and the measured plane of the longitudinal wall bend angle is called intersection point a; The intersection point between the longitudinal wall measurement section, the measured plane of the longitudinal wall height, and the measured plane of the inner surface of the wall panel is designated as intersection point b. Obtain the distance between intersection point a and intersection point b to get the actual height of the longitudinal wall; Step S01, setting up the measurement equipment station, includes the following steps: S011. Set preset positioning points on the forming fixture and import the theoretical coordinates of the preset positioning points into the measuring equipment; the forming fixture is a multi-longitudinal wall composite wall panel integral forming fixture, including a longitudinal wall forming fixture that cooperates with the longitudinal wall and a wall panel forming fixture that cooperates with the wall panel. The forming fixture is set with target points for measurement and the theoretical coordinates of the target points are imported into the measuring equipment. S012. Measure the preset points and target points on the forming tooling using measuring equipment to obtain the measured coordinates of the preset points and target points; S013. By calculating the theoretical and measured coordinates of the preset positioning points and target points, the measuring equipment is placed in the overall coordinate system of the aircraft.

2. The method for measuring the longitudinal wall height of multi-wall composite wall panels according to claim 1, characterized in that, The operation steps for the measurement and planning of the inner surface of the wall panel in step S02 are as follows: Using 3D modeling software, the measurement positions on the inner surface of the composite wall panel are meshed in the 3D digital model of the wall panel. When meshing, the rounded corner area of ​​the longitudinal wall structure is avoided. The meshing method is to arrange points on both sides of the longitudinal wall, namely the first side point and the second side point.

3. The method for measuring the longitudinal wall height of multi-wall composite wall panels according to claim 1, characterized in that, The steps for planning the longitudinal wall height surface points in step S02 are as follows: Using 3D modeling software, the measurement positions of the longitudinal wall height surface are planned in the 3D digital model of the composite wall panel. The rounded corner area of ​​the longitudinal wall structure is avoided during grid planning. The grid planning method is to arrange the points on the longitudinal wall height surface.

4. The method for measuring the longitudinal wall height of multi-wall composite wall panels according to claim 1, characterized in that, The operation steps for planning the points on the longitudinal wall corner surface in step S02 are as follows: using 3D modeling software, the measurement positions of the longitudinal wall corner surface are planned in the 3D digital model of the composite wall panel. When planning the grid, the rounded corner area of ​​the longitudinal wall structure is avoided. The grid planning method is to arrange the points on the longitudinal wall corner surface.

5. The method for measuring the longitudinal wall height of multi-wall composite wall panels according to claim 2, characterized in that, The operation steps for measuring the planned points on the inner surface of the wall panel in step S03 are as follows: use measuring equipment to measure the first side point and the second side point to obtain the measured point coordinate data of the first side point and the second side point; In step S04, the function expression of the measured plane of the inner surface of the wall panel is obtained by fitting the measured coordinate data of the first side point and the second side point.

6. The method for measuring the longitudinal wall height of multi-wall composite wall panels according to claim 3, characterized in that, The operation steps for measuring the height of the longitudinal wall surface in step S03 are as follows: use measuring equipment to measure the height of the longitudinal wall surface and obtain the measured coordinate data of the height of the longitudinal wall surface. In step S04, the function expression of the measured plane of the longitudinal wall height surface is obtained by fitting the measured coordinate data of the points on the longitudinal wall height surface.

7. The method for measuring the longitudinal wall height of multi-wall composite wall panels according to claim 4, characterized in that, The operation steps for measuring the longitudinal wall corner surface points in step S03 are as follows: use measuring equipment to measure the longitudinal wall corner surface points and obtain the measured point coordinate data of the longitudinal wall corner surface points; In step S04, the function expression of the measured plane of the longitudinal wall bend is obtained by fitting the measured coordinate data of the points on the longitudinal wall bend.

8. The method for measuring the longitudinal wall height of multi-wall composite wall panels according to claim 1, characterized in that, Compare the actual height of the longitudinal wall with the theoretical height to determine whether the height of the composite wall panel longitudinal wall is up to standard.

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