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Aircraft skin detection method based on contour feature constraint registration

A technology of aircraft skin and contour features, which is applied in the field of aircraft skin detection based on contour feature constraint registration, can solve the problems of inaccurate registration and few surface features of aircraft skin, so as to avoid influence, avoid misalignment and high efficiency The effect of registration

Pending Publication Date: 2021-11-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an aircraft skin detection method based on contour feature constraint registration, which can effectively solve the problem that the aircraft skin cannot be accurately registered due to the lack of surface features

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  • Aircraft skin detection method based on contour feature constraint registration
  • Aircraft skin detection method based on contour feature constraint registration
  • Aircraft skin detection method based on contour feature constraint registration

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Embodiment Construction

[0039] Such as figure 1 As shown, an aircraft skin detection method based on contour feature constraint registration includes the following steps:

[0040] S1. Obtain the measurement data and CAD model point set of the aircraft skin;

[0041] S2. Obtain the contour point cloud point set P of the aircraft skin through point cloud boundary extraction, and the skin contour point cloud point set Q in the discrete CAD model;

[0042] S3. Calculate the Cκ feature points on the contour based on the curvature mean square error, and cluster the feature points based on the Euclidean distance.

[0043] The specific steps are:

[0044] S11. Use principal component analysis to estimate the normal and curvature of discrete points in the point cloud, and use a discrete point P in the point cloud a Construct the covariance matrix of neighborhood points around a specific number of n three-dimensional points:

[0045]

[0046] where p i for P a The three-dimensional coordinates of the ...

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Abstract

The invention discloses an aircraft skin detection method based on contour feature constraint registration. The method comprises the following steps: acquiring measurement data and a CAD model point set of an aircraft skin; obtaining contour point clouds of the aircraft skin through point cloud boundary extraction, discretizing independently the skin contour point clouds in the CAD model, and obtaining corresponding point sets; calculating Ck feature points on the contour based on curvature mean square error, and clustering the feature points based on Euclidean distance; introducing distance features on the basis of the fast point feature histogram, proposing an FPFH-d feature point description algorithm, and calculating corresponding points in a skin measurement data contour point set and a CAD data contour point set; and solving an initial registration matrix of a skin measurement data contour point set and a CAD data contour point set according to corresponding points on the contour, solving an optimal spatial transformation matrix by taking contour feature point registration as a constraint, and calculating deformation according to a root-mean-square error of a registration result. The method can effectively solve the problem that the aircraft skin cannot be accurately registered due to few surface features.

Description

technical field [0001] The invention relates to the technical field of aircraft skin detection, in particular to an aircraft skin detection method based on contour feature constraint registration. Background technique [0002] Aircraft skin parts are an important part of the aerodynamic shape of the aircraft, and have the characteristics of large size and easy deformation. The processing quality of skin parts directly affects the overall assembly accuracy of the aircraft, and its accurate detection is of great significance to aircraft manufacturing. With the development of optical measurement equipment, it has been possible to quickly obtain the three-dimensional data of the surface of the measured parts. The detection of the manufacturing error of the skin is the process of comparing the measurement data of the skin with the theoretical model. Through the unified measurement point cloud and design The coordinate system of the model, the measured point cloud is converted in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/33G06T7/136G06T7/13G06T7/12G06K9/62
CPCG06T7/33G06T7/13G06T7/12G06T7/136G06T2207/10028G06T2207/30164G06F18/2135
Inventor 崔海华田威胡广露廖文和张益华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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