Uncertainty quantification with application to drill-string nonlinear dynamics and stability of pipe conveying fluid

At Cnam, Paris, July 3rd 2014, 2 p.m.

Thiago Ritto
Associate Professor, Department of Mechanical Engineering, Universidade Federal do Rio de Janeiro (UFRJ), Brazil

This talk is about uncertain quantification in structural dynamics and its interactions. Two applications will be analyzed.

The first one is the drill-string nonlinear dynamics : a slender column rotates and drills into the rock in search of oil. In this first application, the bit-rock interaction model is uncertain. The second application is the problem of a pipe with a moving fluid inside. In this case, the fluid-structure interaction is uncertain and a robust stability analysis is performed. In both applications an adaptation of the nonparametric probabilistic approach (Soize, 2000) is done to cope with modeling errors related to the interaction phenomena : bit-rock interaction and fluid-structure interaction.