A Geometry Restoration Method for Damaged Regions of Complex Surface Parts

Abstract

The invention relates to a geometric repair method for a damaged area of ​​a complex curved surface part, which belongs to the field of computer-aided design and manufacturing, and relates to a complex geometric curved surface repair method for damaged parts. The geometric repair method first establishes the relationship between the measured section data of the damaged part with complex surfaces and its nominal geometric template curve, and then uses the optimization method of alternating iterative fine registration and free deformation, that is, the rotation variable method to calculate the relationship between the actual measurement point and the template curve. The solution of the nearest point and translation, rotation, and deformation transformation matrix gradually reduces the geometric deviation between the template curve and the measured data of the damaged part, so that the design template curve and the measurement point fit to the maximum, thereby reconstructing the defective cross-sectional profile curve, Finally, the skinning operation is performed on the section profile to generate the surface of the complex part, which effectively restores the geometry of the damaged area. The geometric repair method solves the problem of large deviation between the 3D measurement data and the original CAD model of damaged parts with complex surfaces, and ensures the accuracy and practicability of geometric repair.

Description

technical field [0001] The invention belongs to the field of computer-aided design and manufacture, and relates to a method for repairing complex geometric curved surfaces damaged by parts. Background technique [0002] Parts with complex curved surfaces such as blades are prone to damage such as cracks, corrosion, and fractures due to long-term operation in harsh environments such as high temperature, high heat, and high speed, and are deformed to varying degrees, resulting in the existence of actual geometric shapes and nominal geometric models of damaged complex parts. If there is a large deviation, its nominal geometric model is no longer suitable for design, processing and other steps. Therefore, in order to precisely repair damaged parts with complex surfaces, it is necessary to restore the actual geometric shape of the damaged part first, that is, to perform geometric repair on the damaged area. The geometric repair of damaged parts with complex curved surfaces is th...

AI Technical Summary

Problems solved by technology

This method reconstructs the two-dimensional contour of the damaged area by gradually fitting the template curve to the defect cross-section data, and then generates a surface from the cross-section curve, which overcomes the defects of the prior art and avoids the cumbersome operation process and excessive Manual intervention, and problems that do not meet the repair quality and accuracy requirements

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