CN112722322B - Accurate reproduction method and system for airplane horizontal measurement points - Google Patents
Accurate reproduction method and system for airplane horizontal measurement points Download PDFInfo
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- CN112722322B CN112722322B CN202011566260.7A CN202011566260A CN112722322B CN 112722322 B CN112722322 B CN 112722322B CN 202011566260 A CN202011566260 A CN 202011566260A CN 112722322 B CN112722322 B CN 112722322B
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- 238000005259 measurement Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000010276 construction Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The application belongs to the technical field of airplane measurement, and particularly relates to an airplane horizontal measurement point accurate reproduction method and an airplane horizontal measurement point accurate reproduction system. S1, constructing a reference coordinate system based on preset positioning points; s2, under the reference coordinate system, obtaining coordinates of all horizontal measuring points of the aircraft; s3, coating stealth materials on the aircraft to obtain the thickness of the coating materials and the normal direction of the surface of the aircraft body at the horizontal measuring point; and S4, calculating the position of the horizontal measurement point after the stealth material is overlapped under the reference coordinates, and controlling the indicating equipment to emit laser to the position. The application provides a repetition technology which can obtain a preset plane horizontal measurement point without returning the plane to a tooling frame, and can be applied to the situations of spraying stealth materials of the plane, replacing parts containing the horizontal measurement point in the use of an external field and the like so as to ensure that the whole life cycle of the plane can be horizontally measured, evaluate the deformation condition of the plane and further ensure the performance of the plane.
Description
Technical Field
The application belongs to the technical field of airplane measurement, and particularly relates to an airplane horizontal measurement point accurate reproduction method and an airplane horizontal measurement point accurate reproduction system.
Background
The level measurement of an aircraft refers to the measurement of the accuracy of the relative position of various parts of the aircraft in a level state of the aircraft, for checking the relative position and installation quality between the aircraft profile and the various parts and the deformation during use.
The horizontal measuring point on the traditional non-stealth aircraft is an aircraft part assembly stage, and the locating standard of the mould frame is utilized on the tool mould frame, so that the accurate mark is on the outer surface of the aircraft. Has the advantages of simple method, convenient operation, high precision and the like.
With the update of the aircraft, the stealth aircraft begins to mount on the stage. In the design and production of stealth aircraft, due to the stealth performance requirement, the surface of the aircraft is coated with stealth materials, and the horizontal measuring points marked on the tooling frame are completely covered, so that the subsequent aircraft cannot carry out horizontal measurement. Therefore, after the stealth material is sprayed, a new and accurate method for marking the leveling points must be found, namely, the leveling points are reproduced.
Disclosure of Invention
The application aims to accurately find the horizontal measuring point of an airplane after spraying stealth materials to finish the horizontal measuring work of the airplane. The accurate reproduction method of the stealth aircraft horizontal measurement point is provided.
The first aspect of the application provides a method for accurately reproducing a horizontal measuring point of an aircraft, which mainly comprises the following steps:
s1, constructing a reference coordinate system based on a preset positioning point;
s2, under the reference coordinate system, obtaining coordinates of all horizontal measuring points of the aircraft;
s3, coating stealth materials on the aircraft to obtain the thickness of the coating materials and the normal direction of the surface of the aircraft body at the horizontal measuring point;
and S4, calculating the position of the horizontal measurement point after the stealth material is overlapped under the reference coordinates, and controlling the indicating equipment to emit laser to the position.
Preferably, in step S1, the preset positioning point is set in a normally open cabin door of the aircraft.
Preferably, the preset positioning points at least comprise 3 positioning points.
Preferably, the preset positioning points comprise 7, 3 of which are provided in the nose landing gear door of the aircraft, and the other 4 of which are provided in the main landing gear door of the aircraft.
Preferably, the constructing the reference coordinate system based on the preset positioning point includes:
obtaining a plurality of groups of positioning point coordinates by changing the position of the measuring equipment;
under the same preset coordinate system, carrying out data fitting on a plurality of groups of positioning point coordinates to obtain accurate coordinates of positioning points;
and determining the reference coordinate system based on the accurate coordinates of the positioning points.
The second aspect of the application provides an aircraft level measurement point accurate reproduction system, comprising:
the coordinate system construction module is used for constructing a reference coordinate system based on preset positioning points;
the measuring point coordinate recording module is used for obtaining the coordinates of all horizontal measuring points of the aircraft under the reference coordinate system;
the coating data acquisition module is used for coating the stealth material on the aircraft and acquiring the thickness of the coating material and the normal direction of the surface of the aircraft body at the horizontal measuring point;
and the measuring position calculation module is used for calculating the position of the horizontal measuring point after the stealth material is overlapped under the reference coordinates and controlling the indicating equipment to emit laser to the position.
Preferably, in the coordinate system construction module, the preset positioning point is arranged in a normally open cabin door of the aircraft.
Preferably, the preset positioning points at least comprise 3 positioning points.
Preferably, the preset positioning points comprise 7, 3 of which are provided in the nose landing gear door of the aircraft, and the other 4 of which are provided in the main landing gear door of the aircraft.
Preferably, the coordinate system construction module includes:
the point location point coordinate acquisition unit is used for acquiring a plurality of groups of locating point coordinates by changing the position of the measuring equipment;
the data fitting unit is used for performing data fitting on a plurality of groups of positioning point coordinates under the same preset coordinate system to obtain the accurate coordinates of the positioning points;
and the coordinate system generating unit is used for determining the reference coordinate system based on the accurate coordinates of the positioning points.
The application can obtain the preset plane horizontal measuring point without returning the plane to the tooling frame, and solves the problem that the plane horizontal measuring point is covered after spraying stealth materials, and horizontal measurement cannot be carried out. The repeated technology can be applied to the situations of spraying stealth materials of the aircraft, replacing parts with horizontal measuring points in the use of the external field, and the like, so that the whole life cycle of the aircraft can be ensured to carry out horizontal measurement, the deformation situation of the aircraft is evaluated, and the performance of the aircraft is ensured.
Drawings
FIG. 1 is a flow chart of a method of aircraft level measurement point accurate reproduction of the present application.
FIG. 2 is a diagram of a distribution of anchor points according to an embodiment of the present application.
FIG. 3 is a schematic representation of the calculation of measurement points after application of stealth material according to an embodiment of the present application.
Fig. 4 is a schematic diagram of a radar repeater according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application become more apparent, the technical solutions in the embodiments of the present application will be described in more detail with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the application. The embodiments described below by referring to the drawings are exemplary and intended to illustrate the present application and should not be construed as limiting the application. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The first aspect of the present application provides a method for accurately reproducing a horizontal measurement point of an aircraft, as shown in fig. 1, including:
s1, constructing a reference coordinate system based on a preset positioning point;
s2, under the reference coordinate system, obtaining coordinates of all horizontal measuring points of the aircraft;
s3, coating stealth materials on the aircraft to obtain the thickness of the coating materials and the normal direction of the surface of the aircraft body at the horizontal measuring point;
and S4, calculating the position of the horizontal measurement point after the stealth material is overlapped under the reference coordinates, and controlling the indicating equipment to emit laser to the position.
Specifically, locating points are preset in a normally open cabin door of the aircraft, and the locating points are selected from areas which are high in relative machining precision, high in strength, small in deformation, as far as possible and convenient to measure.
As shown in fig. 2, the distance between the points satisfies that the aircraft height H, the aircraft length L, the aircraft width B and the distance between the positioning points is at least two points and is more than 1/3 of the aircraft contour. The number of positioning points is theoretically 3 points, so that a coordinate system can be established, and the coordinate system is established by taking 3-5 points in measurement. The application considers that the aircraft is a large-size object, and relates to a plurality of parts, one station position in measurement cannot be completed, a plurality of station positions are needed, a small deviation possibly exists, 7 points are actually taken for improving the precision, and the 7 positioning points are marked on the tool type frame.
As shown in fig. 2, 3 anchor points are arranged in the nose landing gear bay of the aircraft, 4 anchor points are arranged in the main landing gear bay, and the 7 anchor points are measured using a high-precision lidar measuring device before stealth material is sprayed.
And then in the step S2, before the aircraft sprays stealth materials, a high-precision measuring system (laser radar) is used for collecting coordinates of positioning points under the measuring system, namely actual measurement coordinates, the coordinates are in one-to-one correspondence with theoretical coordinates of the positioning points, then the best fitting of a coordinate system is carried out, a multi-station network data fusion technology is used for fitting the coordinate system, the deviation is smaller than 0.05mm, a theoretical aircraft appearance mathematical model and a produced physical aircraft are built under the same coordinate system, the high-precision measuring system (laser radar) is used for rapidly and high-precision measuring horizontal measurement points of the whole aircraft, and actual measurement coordinate values of the horizontal measurement points at the current stage are obtained.
After the aircraft is sprayed with the stealth material, a unified coordinate system is established by taking 7 positioning points as references in the same state at the first time, coordinate thickness conversion is carried out on coordinate values of measuring points measured before spraying, and then laser radar is used for emitting light to the surface of the aircraft. The return dotting error is about 0.5mm.
It should be noted that, in the step S3, the thickness of the coating material and the normal direction of the fuselage surface at the horizontal measurement point are obtained, which is the basis for precisely calculating the coordinates of the measurement point in the step S4, as shown in fig. 3, M1 is a tangent line at the a position of the outer surface of the aircraft not coated with the stealth material, after the stealth material is coated, the tangent line becomes M2, the original aircraft measurement point is a, and the broken line represents the laser beam.
In some alternative embodiments, the constructing the reference coordinate system based on the preset positioning point includes:
obtaining a plurality of groups of positioning point coordinates by changing the position of the measuring equipment;
under the same preset coordinate system, carrying out data fitting on a plurality of groups of positioning point coordinates to obtain accurate coordinates of positioning points;
and determining the reference coordinate system based on the accurate coordinates of the positioning points.
In this embodiment, for obtaining measured coordinate values of 7 points, a multi-station network data fusion technique is adopted in the measurement process. When the laser radar measures and detects a large-size measured object, multiple transfer stations are needed to complete all measurement tasks. For the measurement condition, six times of station switching are designed, see fig. 4, and the errors of each time of station switching are different due to the selection of the external environment and the laser radar station distribution position. The comprehensive error after laser station switching is the accumulation of multiple station switching errors. The result of the station transfer error directly affects the accuracy of the lidar measurement. In order to reduce errors caused by multiple station switching of the laser radar, a laser radar multi-station network fusion method is adopted before data processing is carried out, so that optimal relative position estimation among stations of the laser radar is obtained, and the quality of a final measurement result is ensured. And obtaining the measured coordinate value of the plane horizontal measuring point before spraying.
The application can obtain the preset plane horizontal measuring point without returning the plane to the tooling frame, and solves the problem that the plane horizontal measuring point is covered after spraying stealth materials, and horizontal measurement cannot be carried out. The technology can be applied to the situations of spraying stealth materials of the aircraft, replacing parts with horizontal measuring points in the use of the external field, and the like, so as to ensure that the whole life cycle of the aircraft can be horizontally measured, evaluate the deformation situation of the aircraft, and further ensure the performance of the aircraft
The second aspect of the application provides an aircraft level measurement point accurate reproduction system corresponding to the method, which comprises the following steps:
the coordinate system construction module is used for constructing a reference coordinate system based on preset positioning points;
the measuring point coordinate recording module is used for obtaining the coordinates of all horizontal measuring points of the aircraft under the reference coordinate system;
the coating data acquisition module is used for coating the stealth material on the aircraft and acquiring the thickness of the coating material and the normal direction of the surface of the aircraft body at the horizontal measuring point;
and the measuring position calculation module is used for calculating the position of the horizontal measuring point after the stealth material is overlapped under the reference coordinates and controlling the indicating equipment to emit laser to the position.
In some alternative embodiments, in the coordinate system construction module, the preset positioning point is set in a normally open cabin door of the aircraft.
In some alternative embodiments, the preset positioning points include at least 3.
In some alternative embodiments, the preset anchor points comprise 7, 3 of which are provided in the nose landing gear door of the aircraft, and the other 4 of which are provided in the main landing gear door of the aircraft.
In some alternative embodiments, the coordinate system construction module includes:
the point location point coordinate acquisition unit is used for acquiring a plurality of groups of locating point coordinates by changing the position of the measuring equipment;
the data fitting unit is used for performing data fitting on a plurality of groups of positioning point coordinates under the same preset coordinate system to obtain the accurate coordinates of the positioning points;
and the coordinate system generating unit is used for determining the reference coordinate system based on the accurate coordinates of the positioning points.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (2)
1. An aircraft level measurement point accurate reproduction method is characterized by comprising the following steps:
s1, constructing a reference coordinate system based on a preset positioning point;
s2, under the reference coordinate system, obtaining coordinates of all horizontal measuring points of the aircraft;
s3, coating stealth materials on the aircraft to obtain the thickness of the coating materials and the normal direction of the surface of the aircraft body at the horizontal measuring point;
s4, calculating the position of the horizontal measurement point after the stealth material is overlapped under the reference coordinates, and controlling the indicating equipment to emit laser to the position;
in step S1, the preset positioning point is set in a normally open cabin door of the aircraft; the preset positioning points comprise 7 positioning points, wherein 3 positioning points are arranged in a front landing gear cabin door of the airplane, and the other 4 positioning points are arranged in a main landing gear cabin door of the airplane;
constructing a reference coordinate system based on preset positioning points comprises the following steps:
obtaining a plurality of groups of positioning point coordinates by changing the position of the measuring equipment;
under the same preset coordinate system, carrying out data fitting on a plurality of groups of positioning point coordinates to obtain accurate coordinates of positioning points;
and determining the reference coordinate system based on the accurate coordinates of the positioning points.
2. An aircraft level measurement point accurate reproduction system, comprising:
the coordinate system construction module is used for constructing a reference coordinate system based on preset positioning points;
the measuring point coordinate recording module is used for obtaining the coordinates of all horizontal measuring points of the aircraft under the reference coordinate system;
the coating data acquisition module is used for coating the stealth material on the aircraft and acquiring the thickness of the coating material and the normal direction of the surface of the aircraft body at the horizontal measuring point;
the measuring position calculating module is used for calculating the position of the horizontal measuring point after the stealth material is overlapped under the reference coordinates and controlling the indicating equipment to emit laser to the position;
the coordinate system construction module comprises a coordinate system construction module, wherein the preset positioning points are arranged in normally open cabin doors of an airplane, the preset positioning points comprise 7 positioning points, 3 positioning points are arranged in front landing gear cabin doors of the airplane, and the other 4 positioning points are arranged in main landing gear cabin doors of the airplane;
the coordinate system construction module includes:
the point location point coordinate acquisition unit is used for acquiring a plurality of groups of locating point coordinates by changing the position of the measuring equipment;
the data fitting unit is used for performing data fitting on a plurality of groups of positioning point coordinates under the same preset coordinate system to obtain the accurate coordinates of the positioning points;
and the coordinate system generating unit is used for determining the reference coordinate system based on the accurate coordinates of the positioning points.
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| CN114987788A (en) * | 2021-11-09 | 2022-09-02 | 上海飞机制造有限公司 | Method for detecting position degree of skin end face of airplane large component |
| CN114166250A (en) * | 2021-12-17 | 2022-03-11 | 江西洪都航空工业集团有限责任公司 | Special tool and method for horizontal measuring point reproduction |
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