Contribution à l’estimation des incertitudes sur un assemblage assisté par la métrologie tridimensionnelle sans recours à des gabarits

Abstract

The use of 3D measurement systems is evolving to replace traditional methods of assembling large aircraft components that generally rely on the use of assembly jigs. The latter are criticized for their manufacturing costs and are generally not flexible: each time the design is modified; adjustments are required, which results in a lack of productivity. In contrast, 3D metrology instruments guarantee flexibility and an automated assembly process. In the context of 3D Metrology Assisted Assembly, the measurement uncertainties of the instruments used and their propagation, as well as the method followed and the use of artifacts, have an important role in the final assembly key characteristic. Although the MAA process has been well studied, the evaluation of the uncertainty and its influence on the functional requirement of the assembly remains an ignored issue in the literature. This work presents an uncertainty assessment of the MAA process with the use of two measurement systems: an iGPS and a laser tracker. An uncertainty evaluation model based on Monte Carlo simulations, combined with the concept of the Small Displacement Torsor (SDT) and the Law of Uncertainty Propagation, is presented and applied to both devices. The results are compared to a dial indicator measurement results. Simulation tests showed negligible errors compared to the experimental results.

Date	6 Oct 2022
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Antoine Tahan (Supervisor)