CN112722322A - Method and system for accurately reproducing horizontal measuring points of airplane - Google Patents
Method and system for accurately reproducing horizontal measuring points of airplane Download PDFInfo
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- CN112722322A CN112722322A CN202011566260.7A CN202011566260A CN112722322A CN 112722322 A CN112722322 A CN 112722322A CN 202011566260 A CN202011566260 A CN 202011566260A CN 112722322 A CN112722322 A CN 112722322A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims description 5
- 230000010076 replication Effects 0.000 claims 2
- 238000005507 spraying Methods 0.000 abstract description 9
- 238000012546 transfer Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method 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
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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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- Aviation & Aerospace Engineering (AREA)
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Abstract
The application belongs to the technical field of airplane measurement, and particularly relates to an accurate reproduction method and system for an airplane horizontal measuring point. The method comprises the steps of S1, constructing a reference coordinate system based on preset positioning points; step S2, obtaining the coordinates of all horizontal measuring points of the airplane under the reference coordinate system; step S3, coating the stealth material on the airplane, and acquiring the thickness of the coating material and the normal direction of the surface of the airplane body at the horizontal measuring point; and step S4, calculating the position of the horizontal measuring point after the stealth material is superposed under the reference coordinate, and controlling the indicating equipment to emit laser to the position. The application provides a recurrence technique need not the aircraft and returns on the frock fixture and can obtain predetermined aircraft horizontal measurement point, and this recurrence technique can be applied to the stealthy material of spraying of aircraft, contains the circumstances such as horizontal measurement point part change in the outfield use to guarantee that the life cycle of aircraft can carry out horizontal measurement, the deformation condition of aassessment aircraft, thereby guarantee the performance of aircraft.
Description
Technical Field
The application belongs to the technical field of airplane measurement, and particularly relates to an accurate reproduction method and system for an airplane horizontal measuring point.
Background
The horizontal measurement of the airplane refers to the measurement of the relative position accuracy of each part of the airplane when the airplane is in a horizontal state, and is used for checking the appearance of the airplane and the relative position and installation quality among the parts and deformation during use.
A horizontal measuring point on a traditional non-stealth airplane is in an airplane part assembling stage, and a positioning reference of a fixture is utilized on a fixture, so that the horizontal measuring point is accurately marked on the outer surface of the airplane. The method has the advantages of simplicity, convenience in operation, high precision and the like.
With the updating of the airplane, the stealth airplane begins to step on the stage. In the design and production of the stealth aircraft, due to the requirement of stealth performance, the surface of the aircraft is coated with stealth materials, horizontal measuring points marked on a tooling fixture are completely covered, and the subsequent aircraft cannot carry out horizontal measurement. Therefore, after the stealth material is sprayed, a new and accurate method for marking the leveling point must be found, i.e., the leveling point is reproduced.
Disclosure of Invention
The invention aims to accurately find a horizontal measuring point of an airplane after the airplane is sprayed with a stealth material, so as to finish the horizontal measuring work of the airplane. Provides an accurate reproduction method for a horizontal measuring point of a stealth aircraft.
The application provides an accurate recurrence method of an airplane horizontal measuring point in a first aspect, which mainly comprises the following steps:
step S1, constructing a reference coordinate system based on preset positioning points;
step S2, obtaining the coordinates of all horizontal measuring points of the airplane under the reference coordinate system;
step S3, coating the stealth material on the airplane, and acquiring the thickness of the coating material and the normal direction of the surface of the airplane body at the horizontal measuring point;
and step S4, calculating the position of the horizontal measuring point after the stealth material is superposed under the reference coordinate, 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 include at least 3 positioning points.
Preferably, the predetermined positioning points comprise 7, of which 3 are provided in the nose landing gear bay of the aircraft and the other 4 are provided in the main landing gear bay of the aircraft.
Preferably, the constructed reference coordinate system based on the preset positioning points includes:
obtaining coordinates of a plurality of groups of positioning points by changing the position of the measuring equipment;
carrying out data fitting on the coordinates of a plurality of groups of positioning points under the same preset coordinate system to obtain accurate coordinates of the positioning points;
and determining the reference coordinate system based on the accurate coordinates of the positioning points.
This application second aspect provides an accurate recurrence system of aircraft leveling point, includes:
the coordinate system construction module is used for constructing a reference coordinate system based on a preset positioning point;
the measuring point coordinate recording module is used for obtaining the coordinates of all horizontal measuring points of the airplane under the reference coordinate system;
the coating data acquisition module is used for coating the stealth material on the airplane and acquiring the thickness of the coating material and the normal direction of the surface of the airplane body at the horizontal measurement point;
and the measuring position calculating module is used for calculating the position of the horizontal measuring point after the stealth material is superposed under the reference coordinate, and controlling the indicating equipment to emit laser to the position.
Preferably, in the coordinate system building module, the preset positioning point is arranged in a normally open cabin door of the aircraft.
Preferably, the preset positioning points include at least 3 positioning points.
Preferably, the predetermined positioning points comprise 7, of which 3 are provided in the nose landing gear bay of the aircraft and the other 4 are provided in the main landing gear bay of the aircraft.
Preferably, the coordinate system building module includes:
the point location coordinate acquisition unit is used for acquiring a plurality of groups of positioning point coordinates by changing the position of the measuring equipment;
the data fitting unit is used for performing data fitting on the coordinates of the multiple groups of positioning points under the same preset coordinate system to obtain 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 provides a recurrence technique need not the aircraft and returns can obtain predetermined aircraft horizontal surveying point on the frock type frame to horizontal surveying point is covered after having solved aircraft spraying stealthy material, can't carry out horizontal surveying's problem. The recurrence technology can be applied to the conditions of spraying stealth materials of the airplane, replacement of components with horizontal measuring points in outfield use and the like so as to ensure that the whole life cycle of the airplane can be subjected to horizontal measurement, and the deformation condition of the airplane is evaluated so as to ensure the performance of the airplane.
Drawings
Fig. 1 is a flowchart of an aircraft leveling point precision reproduction method of the present application.
Fig. 2 is a schematic diagram of anchor point distribution according to an embodiment of the present application.
Fig. 3 is a schematic view of the calculation of the measuring points after the stealth material coating is performed according to an embodiment of the present application.
Fig. 4 is a schematic diagram of a radar transfer station according to an embodiment of the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below 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 present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
In a first aspect, the present application provides an aircraft leveling point accurate reproduction method, as shown in fig. 1, including:
step S1, constructing a reference coordinate system based on preset positioning points;
step S2, obtaining the coordinates of all horizontal measuring points of the airplane under the reference coordinate system;
step S3, coating the stealth material on the airplane, and acquiring the thickness of the coating material and the normal direction of the surface of the airplane body at the horizontal measuring point;
and step S4, calculating the position of the horizontal measuring point after the stealth material is superposed under the reference coordinate, and controlling the indicating equipment to emit laser to the position.
Specifically, a positioning point is preset in a normally open cabin door of the airplane, and the positioning point is selected in an area which is high in relative machining precision, large in strength, small in deformation, as far as possible, and convenient to measure.
As shown in fig. 2, wherein the spacing of the points is such that the aircraft height H, the aircraft length L, the aircraft width B, and the distance between the anchor points is at least two points greater than 1/3 of the aircraft contour. The number of the positioning points is theoretically 3 points, and a coordinate system can be established by taking 3-5 points in the measurement. The invention considers that the airplane is a large-size object and relates to a plurality of components, one station in measurement cannot be completed, a plurality of stations are needed, a little deviation may exist, 7 points are actually taken for improving the precision, and the 7 positioning points are marked on the tooling fixture.
As shown in fig. 2, 3 positioning points are arranged in the nose landing gear bay of the aircraft, 4 positioning points are arranged in the main landing gear bay, and the 7 positioning points are measured by using high-precision laser radar measuring equipment before the stealth material is sprayed.
And then in step S2, before the aircraft is sprayed with the stealth material, a high-precision measurement system (laser radar) is used for collecting coordinates of the positioning points under the measurement system, namely actual measurement coordinates, the coordinates are in one-to-one correspondence with theoretical coordinates of the positioning points, then the optimal fitting of a coordinate system is carried out, a multi-station network data fusion technology is used when the coordinate system is fitted, the deviation is less than 0.05mm, a theoretical aircraft appearance mathematical model and a produced physical aircraft are established under the same coordinate system, a high-precision measurement system (laser radar) is used for rapidly and highly precisely measuring horizontal measurement points of the whole aircraft, and actual measurement coordinate values of the horizontal measurement points at the current stage are obtained.
Spraying stealth materials on the airplane, establishing a unified coordinate system by taking 7 positioning points as reference in the same state of the airplane at the first time after spraying, performing coordinate thickness conversion on a measurement point coordinate value measured before spraying, and then transmitting light to the surface of the airplane by using a laser radar. The error of the dotting back is about 0.5 mm.
It should be noted that, the step S3 of obtaining the thickness of the coating material and the normal direction of the fuselage surface at the horizontal measurement point is the basis of the precise calculation of the coordinates of the measurement point in step S4, as shown in fig. 3, M1 is the tangent line at a of the aircraft outer surface not coated with the stealth material, after the stealth material is coated, the tangent line is changed to M2, the original aircraft measurement point is a, and the broken line represents the laser beam, and it can be seen that if the correction of the coordinate point is not performed, after the stealth material is coated, the laser beam will hit the position of point C, and should actually hit point B, and the thickness AB and the direction of the coating material are obtained, the specific position of point B can be determined, so that the measurement error is reduced.
In some optional embodiments, the constructing of the reference coordinate system based on the preset positioning points includes:
obtaining coordinates of a plurality of groups of positioning points by changing the position of the measuring equipment;
carrying out data fitting on the coordinates of a plurality of groups of positioning points under the same preset coordinate system to obtain accurate coordinates of the positioning points;
and determining the reference coordinate system based on the accurate coordinates of the positioning points.
In this embodiment, for obtaining the actual measurement coordinate values of 7 points, a multi-station network data fusion technology is adopted in the measurement process. When the laser radar carries out measurement and detection on a large-size measured object, all measurement tasks can be completed only by multiple station transfer. Aiming at the measurement condition, six times of station transfer are designed and shown in figure 4, and due to the selection of the external environment and the station distribution position of the laser radar, the station transfer errors are different every time. The comprehensive error after laser station transfer is the accumulation of errors of multiple station transfers. The result of the station transfer error directly affects the accuracy of the lidar measurement result. 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 the optimal relative position estimation among all stations of the laser radar is obtained, and the quality of a final measurement result is ensured. And acquiring the actual measurement coordinate value of the horizontal measurement point of the airplane before spraying.
The application provides a recurrence technique need not the aircraft and returns can obtain predetermined aircraft horizontal surveying point on the frock type frame to horizontal surveying point is covered after having solved aircraft spraying stealthy material, can't carry out horizontal surveying's problem. The recurrence technology can be applied to the conditions of spraying stealth materials of the airplane, replacement of components with horizontal measuring points in outfield use and the like so as to ensure that the whole life cycle of the airplane can be horizontally measured and the deformation condition of the airplane is evaluated, thereby ensuring the performance of the airplane
The second aspect of the present application provides an aircraft leveling point accurate recurrence system corresponding to the above method, including:
the coordinate system construction module is used for constructing a reference coordinate system based on a preset positioning point;
the measuring point coordinate recording module is used for obtaining the coordinates of all horizontal measuring points of the airplane under the reference coordinate system;
the coating data acquisition module is used for coating the stealth material on the airplane and acquiring the thickness of the coating material and the normal direction of the surface of the airplane body at the horizontal measurement point;
and the measuring position calculating module is used for calculating the position of the horizontal measuring point after the stealth material is superposed under the reference coordinate, and controlling the indicating equipment to emit laser to the position.
In some optional embodiments, in the coordinate system building module, the preset positioning point is set in a normally open cabin door of the aircraft.
In some optional embodiments, the preset positioning point includes at least 3 positioning points.
In some alternative embodiments, the predetermined positioning points comprise 7, of which 3 are disposed within the nose gear bay of the aircraft and the other 4 are disposed within the main gear bay of the aircraft.
In some optional embodiments, the coordinate system building module comprises:
the point location coordinate acquisition unit is used for acquiring a plurality of groups of positioning point coordinates by changing the position of the measuring equipment;
the data fitting unit is used for performing data fitting on the coordinates of the multiple groups of positioning points under the same preset coordinate system to obtain 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 above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An accurate reproduction method for a horizontal measuring point of an airplane is characterized by comprising the following steps:
step S1, constructing a reference coordinate system based on preset positioning points;
step S2, obtaining the coordinates of all horizontal measuring points of the airplane under the reference coordinate system;
step S3, coating the stealth material on the airplane, and acquiring the thickness of the coating material and the normal direction of the surface of the airplane body at the horizontal measuring point;
and step S4, calculating the position of the horizontal measuring point after the stealth material is superposed under the reference coordinate, and controlling the indicating equipment to emit laser to the position.
2. The method for accurately reproducing the leveling points of an aircraft according to claim 1, wherein the preset positioning points are provided in a normally open cabin door of the aircraft in step S1.
3. The method for accurately reproducing airplane leveling points according to claim 1, wherein the preset positioning points comprise at least 3.
4. An aircraft leveling point accurate reproduction method according to claim 3 wherein the predetermined positioning points comprise 7, of which 3 are located within the nose gear bay of the aircraft and the other 4 are located within the main gear bay of the aircraft.
5. The method for accurately reproducing the leveling points of an aircraft according to claim 1, wherein constructing a reference coordinate system based on the preset positioning points comprises:
obtaining coordinates of a plurality of groups of positioning points by changing the position of the measuring equipment;
carrying out data fitting on the coordinates of a plurality of groups of positioning points under the same preset coordinate system to obtain accurate coordinates of the positioning points;
and determining the reference coordinate system based on the accurate coordinates of the positioning points.
6. An aircraft leveling point accurate reproduction system, comprising:
the coordinate system construction module is used for constructing a reference coordinate system based on a preset positioning point;
the measuring point coordinate recording module is used for obtaining the coordinates of all horizontal measuring points of the airplane under the reference coordinate system;
the coating data acquisition module is used for coating the stealth material on the airplane and acquiring the thickness of the coating material and the normal direction of the surface of the airplane body at the horizontal measurement point;
and the measuring position calculating module is used for calculating the position of the horizontal measuring point after the stealth material is superposed under the reference coordinate, and controlling the indicating equipment to emit laser to the position.
7. The aircraft leveling point precision reproduction system of claim 6, wherein in the coordinate system construction module, the preset positioning points are arranged in a normally open cabin door of the aircraft.
8. An aircraft leveling point accurate replication system according to claim 6 wherein the predetermined setpoint comprises at least 3.
9. An aircraft leveling point accurate replication system according to claim 8 wherein the predetermined positioning points comprise 7, of which 3 are disposed within a nose gear bay of the aircraft and the other 4 are disposed within a main gear bay of the aircraft.
10. An aircraft leveling point precision reproduction system according to claim 6 wherein the coordinate system construction module comprises:
the point location coordinate acquisition unit is used for acquiring a plurality of groups of positioning point coordinates by changing the position of the measuring equipment;
the data fitting unit is used for performing data fitting on the coordinates of the multiple groups of positioning points under the same preset coordinate system to obtain 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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