Uncertainties in the dynamical response and stability of mechanical systems: Modeling, simulation and lab experiments
At LMSSC, Paris, June 24th 2019, 1 p.m.
Associate Professor, Department of Mechanical Engineering, Universidade Federal do Rio de Janeiro (UFRJ), Brazil
This work is interested in the modeling and simulation of uncertainties in the response and stability of mechanical systems. Two specific applications are tackled: drill string dynamics and hyperelastic materials. In the first application the system is nonlinear and uncertainties in the bit-rock interaction (local nonlinearity) are taken into account. The interaction law presents stochastic hysteretic cyles. A test rig was designed and constructed in the Acoustics and Vibration Lab of the Federal University of Rio de Janeiro, such that simulation and experiments results might be compared. In the second application the Bayesian approach is applied to select, from seven different hyperelastic models, the model that better (in a given sense) characterizes a set of experimental data.