Blade profile measurement model unknown cad Aeroengine

The present invention discloses an aeroengine blade profile measurements of an unknown CAD model, for solving the blade surface coordinate measuring method for low precision problems of the prior art aero-engine. Curve aspect is based on measurement and analysis of several pieces of the blade-type reaction surface curvature distribution of the principal axis direction, the control is obtained based on the curvature of the curve control points and tolerance, and to determine the measurement section of the blade; continuous curvature-based prediction, each planning Article measurement sections measurement point sets, to achieve CAD model unknown CMM aviation engine blade profile. Since the method according to the blade surface curvature profile characteristics selected measurement section of the blade; and measuring measurement points to achieve a sectional plan based continuous curvature prediction, the prediction method has a continuous curvature better robustness, reducing the profile redundant points extraction, where extraction point and ensures better fit sectional profile measuring changes curvature. Not only improves the measurement efficiency but also to ensure the accuracy of measurement.