METHOD FOR THREE-DIMENSIONAL RECONSTRUCTION OF THE THREAD OF THE HOLES FOR THE STUDS OF THE MAIN CONNECTOR OF THE REACTOR PRESSURE VESSEL AND AUTOMATIC IDENTIFICATION OF DEFECTS Russian patent published in 2023 - IPC G06T7/62 G16C60/00 G21C17/01 

FIELD: repair of NPP equipment; thread reconstruction.

SUBSTANCE: invention relates to the field of repair of NPP equipment, specifically to the three-dimensional reconstruction of the thread of the holes for the studs of the main connector of the reactor pressure vessel and the method of automatic identification of defects.Scanning is carried out to obtain two-dimensional coordinates of the thread surface; then the synthesis of three-dimensional coordinate data is carried out, i.e. 3D point cloud data from 2D thread surface coordinate information, angle data, and axial position data of the scanning device; then pre-processing the 3D point cloud data is carried out, determining the normal vectors of the 3D point cloud data, dividing them into smooth and sharp areas, then filtering and denoising, respectively; then optimizing the 3D point cloud data by keeping the data above the threshold; after that, the implementation of a three-dimensional reconstruction of the curved surface of the controlled object and the creation of a mesh model are carried out; then the identification and measurement of the defect, the characterization of the defect by parameters and the conclusion of the defect type are carried out.

EFFECT: ability to quickly and accurately control the thread on a three-dimensional scale, identify defects and calculate the size of defects, display the results of the control, and also fully automatically collect, analyze and process data from all holes, while the time to complete such an operation on one hole is no more than 5 min.

12 cl, 5 dwg