Large-scale three-dimensional rivet concave-convex quantity visualization method based on multi-level fitting

Abstract

The invention discloses a large-scale three-dimensional rivet concave-convex quantity visualization method based on multi-level fitting. The method comprises the steps: S1, obtaining a to-be-processed rivet image, extracting a rivet contour through employing an RANSAC circle fitting algorithm, and obtaining the parameters of a rivet contour circle; s2, extracting a rivet head point cloud according to the rivet contour circle parameters extracted in the step S1 and an RANSAC plane fitting algorithm; and S3, according to the rivet head point cloud and the non-rivet point cloud, the rivet concave-convex amount is calculated and visually displayed. According to the invention, the three-dimensional laser scanning technology is applied to rivet concave-convex quantity detection, so that the detection precision and the detection efficiency of the rivet concave-convex quantity can be improved; and the concave-convex amount of the rivet can be visually displayed so as to judge the riveting quality of the aircraft skin.

Description

technical field [0001] The invention belongs to the technical field of aircraft rivet detection, and in particular relates to a large-scale three-dimensional rivet concave-convex visualization method based on multi-level fitting. Background technique [0002] In recent years, with the rapid development of my country's aerospace industry, how to ensure the reliability and stability of aerospace vehicles has become the primary consideration in aircraft design. The role of aircraft skin is to maintain the shape of the aircraft so that it has good aerodynamic characteristics. The skin is fastened to the above-mentioned members from the outside with rivets. If the rivets fall off, the skin will be deformed, the place under pressure (such as the nose) will be sunken, and the place under the action of suction (such as the upper surface of the wing) will be bulged or even lifted. The quality of rivet riveting directly affects whether the skin can maintain its normal shape and play...

AI Technical Summary

Problems solved by technology

Detection based on vision and touch not only cannot achieve quantitative measurement, but also has disadvantages such as low accuracy, low efficiency, low reliability, and high personnel costs

At present, no reasonable and effective solution has been proposed for the quantitative measurement of the unevenness of rivets.

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