AVIATION BLADE PROFILE DETECTION METHOD AND SYSTEM BASED ON VARIABLE TOLERANCE ZONE CONSTRAINT

摘要

The present invention discloses a method and system for determining an aero-engine blade profile based on variable tolerance zone constraints, and belongs to the field of aero-engine blade determination. The method includes: performing a curvature estimation on all points in a blade profile contour measuring point set of an aero-engine blade, performing a downsampling in the blade profile contour measuring point set based on a curvature distribution, randomly performing a circle fitting through sampled blade profile contour measuring points to realize segmentation of the blade profile contour, thus obtaining a leading edge point set, a trailing edge point set, a blade basin point set and a blade back point set; setting tolerance zone ranges and linear constraints for the leading edge point set, the trailing edge point set, the blade basin point set and the blade back point set respectively, building a target matching function, and solving the target matching function to obtain an optimal pose; and performing a rigid body transformation on the aero-engine blade through the optimal pose, comparing the aero-engine blade obtained after rigid body transformation with a designed blade, and evaluating whether a blade profile of the aero-engine blade is qualified or not. The matching result of the aero-engine blade and the designed blade is more exact, so that the accuracy rate of the blade determination is increased.