Body structure measurement method based on two-point positioning

Abstract

The invention discloses an airframe structure measuring method based on two-point positioning. The airframe structure measuring method includes the steps that two fixed points which can be seen all the time in the measuring process are selected in a measuring place; a total station is erected; coordinates of the fixed points are measured in a total station coordinate system; the central axis horizontal plane of an airframe serves as a planar coordinate system comprising an X axis and a Y axis, and a Z axis is set perpendicular to the horizontal plane to obtain an airframe coordinate system; conversion coefficients of the airframe coordinate system are calculated; coordinates, in the total station coordinate system, of a point to be measured are measured and combined with the conversion coefficients of the airframe coordinate system to obtain coordinates in the airframe coordinate system; the total station is moved to positions of the other points to be measured, coordinates, in the current total station coordinate system, of the fixed points are measured, conversion coefficients of the total station coordinate system are calculated, coordinates, in the total station coordinate system, of the other points to be measured are measured and combined with the conversion coefficients of the total station coordinate system and the conversion coefficients of the airframe coordinate system to obtain coordinates in the airframe coordinate system, and the airframe structure is obtained according to the coordinates, in the airframe coordinate system, of all the measured points. The airframe structure measuring method is simple and high in processing speed and does not need to be operated by profession personnel.

Description

technical field [0001] The invention relates to the field of data surveying and mapping methods used in the case of body structure measurements. More specifically, the present invention relates to an airframe structure measurement method based on two-point positioning for use in the case of airframe structure measurement of fixed-wing aircraft. Background technique [0002] Since the birth of fixed-wing aircraft, it has been widely used in military and civilian fields. With the development of science and technology, fixed-wing aircraft is developing towards a higher and faster direction, so it also puts forward high requirements for the body structure. The processing and assembly errors in the aircraft production process and the mechanical fatigue caused by long-term flight will cause the asymmetry of the airframe structure and the deformation of the main structure. Therefore, there is a demand for the measurement of the main structure of the airframe. [0003] Since fixed-...

AI Technical Summary

Problems solved by technology

[0004] The laser scanner measures the surface of the object by projecting a laser point cloud on the surface of the object. This method has high precision and can realize automatic splicing of data, but the equipment cost of the laser scanner is high, and due to the large amount of data, the processing time is long

[0005] The visual measurement method based on feature points and code points needs to paste reflective fixed points and coded fixed points on the body before measurement, and then use the camera to take pictures of the body from different angles, and use software to extract and stitch the feature points in the acquired images , the accuracy of this method is high, but the equipment cost is also high, and it will take a lot of time to paste the fixed point, which reduces the measurement efficiency

[0006] The measurement method based on the total station has low cost and high precision, and the measurement data can be spliced ​​by free station building, but professionally trained surveyors and mappers are required to operate, which limits the use of this method

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