Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Uncertainty in rotordynamics: A SOBOL’s sensitivity analysis approach
Submission Author:
Guilherme Lacerda , RJ
Co-Authors:
Guilherme Lacerda, Thiago Ritto
Presenter: Guilherme Lacerda
doi://10.26678/ABCM.COBEM2023.COB2023-0342
Abstract
In this work, a Global Sensitivity Analysis was applied in rotodynamics. For the numerical simulations using the finite element method and Timoshenko beam elements, a specific open-software called ROSS was utilized. Another specialized open-software, OpenTURNS, was employed to handle uncertainties and their propagation. The uncertainty applied to the rotor model is parametric, with the chosen parameters for uncertainty application being the stiffness and damping of both bearings. The rotor used in the simulations was selected from literature, and all four parameters were assumed to follow a truncated normal distribution. The results consist of a stochastic Frequency Response Function (FRF) and the SOBOL' indices for sensitivity, including both the first and total sensitivity indices for two cases; the first one was when the rotor is without rotation, and the second was when the rotor is rotating. The stiffness had a greater impact than damping, even with lower standard deviation; while the gyroscopic coupling effect is directly seen in the results of a rotating rotor, is also observed through the variation of the SOBOL' indices between the stiffness along the x-axis and y-axis.
Keywords
Global sensitivity analysis, Rotordynamics, Parametric uncertainty, stochastic dynamics, Monte-Carlo simulation
