Quality evaluation method for aircraft large components joining based on position and orientation measurement uncertainty

In order to support the development and application of digital measurement assisted joining of large size aircraft components based on position and orientation, related work focus on measurement uncertainty of position and orientation, and quality evaluation methodology based on uncertainty was done. First of all, the mathematical expression and connotation of position and orientation in digital joining environment was proposed. Then an analytical algorithm based on covariance matrix for calculating the measurement uncertainty of position and orientation was proposed, and compared with the Monte Carlo simulation algorithm to verify its validity. The concept of digital measurement process capability index was given to evaluate the credibility of measurement result. Through implementing the mapping from measurement uncertainty of position and orientation to quality requirements, a novel methodology for evaluating the quality of large size components joining based on measurement uncertainty of position and orientation was proposed. Finally, the case of wing-fuselage digital joining was studied to present the verification of the feasibility and validity of the methodology.