Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
An inverse problem via cross-entropy method for calibration of a drill string torsional dynamic model
Submission Author:
Eber Dantas de Sá Paiva , RJ , Brazil
Co-Authors:
Eber Dantas de Sá Paiva, Americo Barbosa da Cunha Junior, Francisco José Soeiro, Bruno Cesar Cayres, Hans Ingo Weber
Presenter: Eber Dantas de Sá Paiva
doi://10.26678/ABCM.COBEM2019.COB2019-2216
Abstract
Model selection and parameter identification are challenging tasks in drill string dynamics due to the high degree of nonlinearity that abound the diverse and complex mechanisms involved. This work explores the application of a stochastic metaheuristic procedure for parameter identification over the torsional mode of drill string vibration. A proposed model is calibrated with data from a validated experimental set-up, adjusting stiffness, damping and friction parameters. The resulting simulations display a reasonable fit with almost ideal correlation coefficients even in the presence of stick-slip. The optimization strategy is compared with an Genetic Algorithm, revealing significantly greater efficiency and showcasing how the cross-entropy method may be a viable tool in the demanding context of drill string modeling.
Keywords
drill-string dynamics, Inverse problem, Parameter identification, cross-entropy method, nonlinear dynamics
