Digital measurement system and method for airplane structure deformation measurement and damage grading

Abstract

The invention discloses a digital measurement system and method for airplane structure deformation measurement and damage grading. The digital measurement system comprises a laser tracker, a laser radar and a data acquisition and processing system, the data acquisition and processing system is in communication connection with the laser tracker and the laser radar, wherein the laser tracker is usedfor three-dimensional coordinates of key points on an airplane; the laser radar is used for detecting a free-form surface with an irregular shape; the data acquisition and processing system is responsible for storing aircraft structure data, fitting an equipment measurement coordinate system and an aircraft theoretical coordinate system, and constructing a unified measurement network, and acquiring and processing measurement data. Damage deformation of each part can be precisely measured, and deformation of large-size parts like wings and fuselage which cannot be found by naked eyes can be detected; the measurement process is simple, the measurement speed is high, the measurement period is short, the automation degree is high, and manual operation errors are avoided.

Description

technical field [0001] The invention belongs to the technical field of aircraft inspection and maintenance, and in particular relates to a digital measurement system and method for aircraft structure deformation measurement and damage classification. Background technique [0002] Modern aircraft structures are composed of beams, ribs, frames, purlins, skins and other parts, mostly thin-walled parts. These parts have the characteristics of large size, complex structure, high shape precision requirements, and complex assembly coordination relationship. Large-scale thin-walled parts are prone to flexible deformation during assembly and aircraft use, causing the position of the key points of the actual aircraft structure to deviate from the design range. In recent years, aircraft manufacturers such as Boeing and Airbus have successfully used digital measurement systems and digital flexible automatic positioning adjustment systems to ensure the accuracy and efficiency of aircraft...

AI Technical Summary

Problems solved by technology

[0005] 1. Unable to quantify the deformation and draw qualitative conclusions

Makes maintenance decisions very arbitrary and reduces safety standards

[0006] 2. Unable to determine the airworthiness of the aircraft structure

Existing inspection methods cannot identify small deformations of large-scale components, and these deformations often affect the symmetry and aerodynamic performance of the entire aircraft, further affecting the airworthiness of the aircraft;

[0007] 3. It is impossible to determine the degree of deviation of the overall structure of the aircraft from the design parameters. The existing damage classification method is based on non-destructive testing and other methods, which only target a single component, and cannot judge whether the overall structure deviates from the design requirements

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